US3896591A - Machine for sharpening disc blades - Google Patents

Machine for sharpening disc blades Download PDF

Info

Publication number
US3896591A
US3896591A US212482A US21248271A US3896591A US 3896591 A US3896591 A US 3896591A US 212482 A US212482 A US 212482A US 21248271 A US21248271 A US 21248271A US 3896591 A US3896591 A US 3896591A
Authority
US
United States
Prior art keywords
mandril
frame
disposed
grinder
mounting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US212482A
Inventor
Lloyd J Ruble
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US212482A priority Critical patent/US3896591A/en
Application granted granted Critical
Publication of US3896591A publication Critical patent/US3896591A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/46—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of disc blades
    • B24B3/466—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of disc blades of cultivator disc blades

Definitions

  • the mandril is rotatably driven by a mandril 762,399 6/1904 Goehring et d1v 51/266 x drive P T PPer end of 2,127,071 8/1938 Schmalz 51/51 x the m'flhdtll Shaft 18 fdlsposed hqutd tank 9 that 2,401,486 6/1946 Jones 51 106 R the (1186 blade IS Submerged during the grlhdihg 2,402,305 6/1946 Sutton" 51/106 R contact, thus eliminating noise and flying chips.
  • Circular concave steel blades ganged together to form a disc are used for a variety of purposes, including plowing earth for farming and tearing up an asphalt road surface for replacement or repair.
  • the peripheral edges of the disc blades are sharpened to provide the necessary cutting action in performance of their work and with use become dull and must be resharpened.
  • the disc blades are made of hardened steel and resharpening, therefore, requires a substantial amount of grinding. Since the disc blades are circular and concave an effective resharpening job requires that the grinding stone be moved around the periphery of the blade at varying tangential angles to the blade surface so that the peripheral edge of the blade is given substantially the same amount and angle of grinding at each point.
  • the surface of the grinding wheel first engages the peripheral edge of the blade with the plane of the wheel disposed only at a slight angle to a plane normal to the axis of the disc and as the sharpening progresses the grinding wheel surface is moved to a greater angle to the normal plane as the grinding cut moves outwardly to the outermost periphery of the blade.
  • Another object of my invention is to provide a machine for grinding disc blades of the type described in which the disc blades are submerged in liquid during the grinding operation to trap hot particles, keep the blade steel cool, and minimize noise.
  • a further object of my invention is to provide a.ma-: chine of the type described in which the disc is auto matically rotated during the sharpening operation to provide uniform contact between all points on the blade periphery and the grinding wheel.
  • Still another object of my invention is to provide a machine of the type described in which the mandril which mounts the disc blade is movable angularly with respect to the surface of the grinding stone to vary the tangential angle of contact between the grinding stone and the blade edge.
  • Yet a further object of my invention is to provide a machine of the type described in which the blades can be readily mounted and dismounted from the support mandril and the grinding stone can be readily changed.
  • Still a further object of my invention is to provide a machine of the type described which is relatively inexpensive to manufacture and requires a minimum of time and operator skill in use.
  • FIG. 1 is a side elevational view of a preferred embodiment of my invention
  • FIG. 2 is a front elevational view of the machine shown in FIG. 1;
  • FIG. 3 is a sectional plan view taken on line 33 in FIG. 2;
  • FIG. 4 is a partial sectional side elevational view taken on line 44 in FIG. 2;
  • FIG. 5 is a partial sectional view taken on line 55 in FIG. 4;
  • FIG. 6 is an enlarged partial sectional view taken on line 66 in FIG. 4;
  • FIG. 7 is an exploded perspective view of the disc blade mounting mechanism in my preferred embodiment
  • FIG. 8 is a partial sectional plan view taken on line 88 in FIG.,2 and showing the grinding wheel and its drive motor;
  • FIG. 9 is a schematic view of the hydraulic control for the grinder wheel feed mechanism.
  • FIG. 10 is a partial sectional view taken on line 10-10 in FIG. 1.
  • the numeral 10 designates my disc blade grinding machine generally.
  • the machine 10 has a base 12 with a lower frame 14 extending upwardly therefrom.
  • the lower frame 14 is generally V- shaped upwardly and has a rearwardly, directed structural support portion 16.
  • An upper frame 18 is mounted on the lower frame 14 by a hinge 20 connected to the upper end of the lower frame structural support 16.
  • the upper frame 18 has a grinding wheel support head 22 on its distal end with respect to the hinge 20.
  • the grinding wheel support head 22 is disposed generally vertically and has a grinding wheel mounting plate 23, movably mounted thereon.
  • the grinding wheel mounting plate 23 carries a grinding wheel drive motor 24 on its upper portion and a grinding wheel 26 on its lower portion.
  • the grinding wheel, 26 is connected to a shaft 28 of the drive motor 24 by means of a coupling 30. Below the coupling 30, the drive shaft 28 passes through a bearing housing 32 with thrust bearings (not shown) which support the weight of the grinding wheel.
  • the grinding wheel mounting plate 23 is secured to the grinding wheel support head 22 by a pair of mounting plate flanges 25 positioned on each side of the grinding wheel mounting plate 23.
  • the mounting plate flanges 25 extend rearwardly, substantially normal to the grinding wheel mounting plate 23 and overlap support head flanges 27 on the grinding wheel support head 22.
  • the mounting plate flanges 25 have vertically extending slots 29 which align with holes 31 in the support head flanges 27.
  • Bolts 33 are disposed through the slots 29 and holes 31 to releasably secure the flanges together.
  • a mounting plate lift frame 35 is attached to both sides of the grinding wheel mounting plate 23 and support head 22.
  • Ahydraulic mounting'plate adjust" ment cylinder 37 is connected between the grinding wheel support head 22 and the mounting plate lift frame 35 and, upon actuation, moves the grinding wheel mounting plate 23 vertically with respect to the grinding wheel support head 22 when the bolts 23 are released to permit movement.
  • Movement of the grinding wheel mounting plate 33 with respect to the grinding wheel support head 22 adjusts the vertical position of the grinding wheel 26 and compensates for wear as more fully explained later.
  • the vertical adjustment position of the grinding wheel is indicated by a scale plate 39 mounted on the grinding wheel support head and disposed in indicating relationship with a pointer 40 mounted on the grinding wheel mounting plate (see FIGS. 2 and 8).
  • the grinding wheel 26 consists of a torodial grinding stone 34 mounted in a grinding wheel chuck 36 attached to the lower end of the shaft 28 below the bearing housing 32.
  • the grinding wheel chuck 36 has a backing plate 38 connected to the shaft 28 with a peripheral rim 40 projecting normal thereto to provide a cavity 42.
  • 'An annular retaining ring 44 is secured to the face of the peripheral rim 40 by bolts 45, and has a beveled surface 46 on its inner edge which tapers outwardly and upwardly toward the rim 40.
  • the rim 40 has a beveled surface 47 on its inner edge which tapers outwardly and downwardly to meet the uppermost end of the surface 46 and form. a wedge shaped annular slot 48.
  • a wedge shaped split ring 49 is disposed in the slot 48 and has mating surfaces which are engaged by the beveled surfaces 46 and 47.
  • the beveled surfaces 46 and 47 are so disposed that tightening the bolts 45 to draw the annular.
  • retaining ring 44 toward the rim 40 forces the split ring 49 radially inward into the cavity 42 to engage and grip the periphery of the grinding stone 34.
  • a gasket 50 is mounted on the periphery of the stone.
  • the gasket 50 does not extend to the face of the stone so that it produces no interference with its grinding function, and further, even if the stone face is worn to the point where the gasket is exposed to the grinding area; the gasket merely wears off without effect on the grinding.
  • the upper bevel 47 is made'very slight to avoid pressing the grinding stone upward into the chuck when the split ring'49 is driven inwardly.
  • the torodial grinding stone 34 has an outside diameter substantially the same as the inside diameter of the peripheral rim 40 on the grinding wheel chuck 36 and end of the mandril in an arcuate direction so that proper positioning of a disc blade with respect to the;
  • the upper frame 18 is pivotally movable about the hinge 20 by means of a hydraulically operable grinding wheel contact cylinder 52 which is connected between the upper portion of the lower frame 14 and the distal .portion of the upper frame 18.
  • a hydraulically operable grinding wheel contact cylinder 52 which is connected between the upper portion of the lower frame 14 and the distal .portion of the upper frame 18.
  • the upper frame In its lowermost pivotal position the upper frame rests upon the lower frame and the shaft 28 is positioned substantially vertical, disposing the lower surface of the grinding stone ina substantially horizontal plane. 133/ activation of the grinding wheel control cylinder 52, the upper frame can be moved. pivotally upward from the lower frame, tilting the lower end of the grinding wheel drive shaft 28 outwardly fromthe lower frame and swinging the lower surface of the grinding stone so that its plane is angularly offset from the horizontal. Swinging the upper frame 18 between its lower and upper positions thereby causes the lower surface of the grinding stone to trace an arcuate path.
  • the pivotal movement of the upper frame 18 with re-' spect to the lower frame through activation of the grinding wheel control cylinder 52 is achieved by a grinding wheel position control 54 hereafter described in greater detail.
  • the grinding wheel is covered by a band-shaped guard 56 which leaves the lower surface of the grinding stone exposed for engagement with the disc blade.
  • a grinding wheel pan 58 into which the grinding wheel fitswhen;
  • the grinding wheel pan. 58 has a semicircular lower surface which drops off into a tank 60. r
  • a disc blade support mandril 62 has an upper end 64 which projects upwardly into the tank 60 and has a lower end 66 which extends downwardly outsidethe tank toward the base 12 of the machine.
  • the mandril 62 has a hollow.
  • driveshaft 68 which is rotatably mounted in a mandril support housing701by means of 7 an upper end bearing 72 and a lower end bearing 74.
  • the mandril support housing has its upper end mounted in the lower frame 14 by means of amounting frame 76 which is secured to the lower frame by a locking stud 78.
  • the locking stud 78 passes through an a cuate slot 80 in the lower frame and a vertically disposed linear slot 79 inthe mandril upper end 64.
  • the lower end of the mandril support housing i 70 is mounted on the lower frame bymeans of a trun-. ion bearing 84 which permits movement of the upper grinding wheel 26 can be achieved, as'later explained.
  • the trunion bearing '84 is mounted on the mandril.
  • the stub shafts 85 of the trunion bearing 84' are mounted to the lower frarne14 by means of bearing caps 87 which are secured to the frame by bearing cap 1 bolts 89. (See FIGS. 1 and 2)
  • the bearing cap bolts 89 4 y are mounted in frame slots 91in the lower frame which are generally aligned with theaxis of the mandril support housing 70, so that the mounting point ofthe stub w shafts 85 in the lower frame 14 is also adjustable.
  • the adjustabiiity of the clamping band 81 on the mandril housing70 and the stub shafts 85 in the lower frame 14 permit adjustmentiof both the radius and. thecenter point of the arcuate movement of the upper end 14 of the mandril, as more fully explained later.-
  • the upper end of the mandrilsupport provided about the opening 86 to prevent leakage of liquid from the tank 60.
  • the seal consists of a flanged collar 90 disposed normal to the driveshaft of the mandril and mounted on the upper end of the mandril support housing 70.
  • the collar 90 is of sufficient size to overlap the peripheral edges of the opening 86 through which the mandril support housing passes and to permit movement of the mandril support housing in the opening without exposing the opening for the tank.
  • a drive pulley 92 is provided on a power transfer shaft 93 adjacent the lower end of the mandril 62 and is driven by a mandril drive motor 94 through a drive belt 96 (see FIG. 1).
  • the mandril 62 is, in turn, driven by the power transfer shaft 93 through a chain and sprocket drive 97.
  • a lock shaft 98 is provided in the bore of the;man-.
  • the lock shaft 98 moves reciprocally in the mandril driveshaft bore from an extended position in which the upper end of the lockshaft projects upwardly beyond the upper end 64 of the mandril, to a retracted position where the upper end of the lock shaft is withdrawn into the upper end of the mandril.
  • the reciprocal movement of the lockshaft 98 is powered by a hydraulically actuated piston 100 attached to the lower end of the lockshaft and enclosed by a housing 102.
  • the piston 100 is biased by a spring 104 to drive the lockshaft upwardly and is powdered hydraulically to drive the lock shaft downward against the spring bias in a manner well known in the art (see FIG. I).
  • a sloted head 106 is formed which cooperates with a lock plate 108 to lock disc blades to the lockshaft.
  • the lock plate 108 has a square center bore 110 which fits over the square flange 112 on the sloted head 106 but is locked on the head by one quarter rotation in the slots 114 (see FIG. 7).
  • the slotted head 106 is small enough to pass through the bore in a disc blade but the lock plate is 7 larger than the disc blade bore so that when the slotted head 106 is moved to its upper position a disc blade may be mounted on the lockshaft by inserting the slotted head through the disc blade bore, setting the lock plate 108 over the slotted head and rotating it one quarter turn to lock it in the slots 114 and then retracting the lockshaft 98 to engage the upper surface of of the blade with the lock plate.
  • a mandril mounting plate 116 is affixed to the mandril driveshaft 68 at its upper end. The mandril mounting plate 116 projects radially outward from the mandril drive shaft a distance sufficient to provide a secure mounting base for the disc blade but less than the disc blade diameter to avoid interference with the grinding of the peripheral edges (see FIG. 4).
  • the disc blade is thus clamped between the lock plate 108 engaged in the slots 114 on the slotted head 106 on the upper end of the lockshaft and the periphery of the mandril mounting plate 116 on the upper end of the mandril driveshaft, when the lockshaft is driven to its retracted position by actuation of the piston 100.
  • a mandril position cylinder 118 is provided.
  • the mandril position cylinder 118 is hydraulically actuated and is connected between the lower frame 14 and the upper end 64 of the mandril, so that extension of the cylinder arm drives the upper end 64 downwardly and retraction draws it upwardly along the arc defined by the arcuate slot 80.
  • the locking stud 78 and its locknut 82 releasably secure the mandril upper end 64 in its desired position, and the vertically disposed linear slot 79 allows adjustment of the locking stud 78 in the mandril upper end 64 during its arcuate movement in slot 80.
  • the tank 60 is filled with water by means of a water supply system 120.
  • the water supply system 120 includes a reservoir 122, and a water pump 124 (see FIG. 2).
  • the reservoir 122 is connected to the tank 60 by means of a main supply line 126, a return line 128, and an upper supply line which branches off of the main supply line and deliverswater under pressure to the grinding wheel pan 58 by means of a nozzle 132.
  • the nozzle 132 directs water against the lower surface of the grinding stone 34 so that the point of grinding ac- 7 tion is cooled and the generated sparks are contained and noise controlled (see FIG. 4).
  • the water delivered by the nozzle 132 runs off from the grinding wheel pan 58 into the tank 60.
  • a flow control valve 134 is provided in the return line 128 to control the water. circulation and maintain the water in tank 60 at a constant level. Regulation of the flow control valve 134 with the capacity of the pump 124 will assure prompt filling and emptying of the tank 60 and will limit the high water level to the height of the grinding wheel pan 58.
  • an overflow drain 133 is provided to remove any excess water from the grinding wheel pan 58.
  • the grinding Wheel position control 54 consists of a control plunger 136 mounted in a cylinder 138 on the upper surface of the lower frame 14 (see FIGS. 1 and 9).
  • the plunger 136 is biased to an upper position by a spring 140 in the cylinder 138.
  • the cylinder 138 is filled with hydraulic fluid and has bypass lines 142 which connect the upper portion of the cylinder to its lower portion through a control valve 144.
  • the control valve 144 permits fluid flow from the lower to the upper portion of cylinder 138 at a controlled rate so that the travel of the plunger 136 from its upper position to its lower position in cylinder 138 against the bias of spring 140 is restricted in speed.
  • a check valve 146 is provided which is a one-way valve and permits free flow of fluid from the upper to lower portions of cylinder 138, for free return of the piston to its upper position.
  • the control valve 144 is regulated by a control valve solenoid 148.
  • the solenoid 148 can be electrically connected with the drive motor 24 so that the feed rate of the grinding wheel is controlled by the load on the motor.
  • the plunger 136 of the grinding wheel position control 54 is engaged by a control foot 150 on the upper frame 16 when the upper frame is lowered into grinding position by the grinding wheel cylinder 52, and controls further downward movement of the grinding wheel 26.
  • a limit stop 152 is provided on the upper surface of the lower frame 14 adjacent the grinding wheel position control 54.
  • the limit stop 152 consists of a limit stud 154 which is vertically adjustable by threading in a stud base 156 on the lower frame 14, and is engaged by a limit foot 158 on the upper frame 16.
  • a limit stop adjustment wheel 160 is provided to readily adjust the position of the limit stud 154 through a a worm gear (now shown).
  • a hydraulic pump 162 is provided on base 12' which is driven by an electric motor 164- and supplies hydraulic fluid through lines 166.
  • V j V j
  • control valves are also provided on a platform 168 at a convenient posi- 7' ,tion on the machine (see FIG. 2).
  • These control valves include a grinding wheel position control; valve 170 which controls the actuation of the grinding wheel positioning cylinder 52, a lockshaft' control valve 172 which controls the reciprocal positioning of the lockshaft 98 through piston 100 in cylinder 102,-and a mandril position control valve 174 which controls the angular dispostion of the axis of the mandril 62 through mandril position cylinder 118.
  • the grinding wheel is then raised again by the grinding wheel'p osition controlvalve 170, and the grinding wheel position control is set forthe desired feed rate. Also, the limit stop 152 is adjustedto the desired maxi mum depth of cut.
  • the grinding stone 7 34 is made to rotate many times faster than the disc dril dri ve motor 94, are provided at other appropriate,
  • the control foot 150 on the upper frame 16 eng'ages the I plunger 136 of the grinding wheel position control 54 i a and the Weight of the'upper frame drives the plunger tion, by pivoting the upper frame 16 upwardly about the hinge 20 by actuation of the grinding wheel positioning cylinder 52 (see FIG. 1).
  • the lockshaft 98 of the mandril 62 is reciprocated to its upward position with the slotted head 108 projecting above the upper downward in the cylinder 138. Since the fluid inthe cylinder 138 must transfer from the lower to the upper portion of the cylinder through the control valve 144 in order for the plunger 136 to move downwardly, the" speed of downward movement of the upper frame, and,
  • the blade With the disc blade positioned on the upper end 64 of the mandril 62 and over the slotted head 1060f the lockshaft 98, as described, the blade is brought to rest on the mandril mounting plate 116.
  • the lock plate 108 is then placed over the slotted'head 106 and rotated a quarter turn to secure it in the slots 114.
  • the lock- I shaft control valve is actuated to draw the lockshaft 98 downward by action of hydraulic fluid on the piston 100, and thus clamp the disc blade on the upper end 64 of the mandril between the locking plate 108 and the mandril mounting plate 116; it 7
  • the grinding wheel is then lowered into contact position with the disc blade and the angular and axial disposition of the mandril axis adjusted by releasing the lock nut 82 on locking stud 78 and tilting the mandril upper end 64 in the trunion bearing 84 by means of mandril positioning cylinder 118 and its control valve 174, and 7 if necessary, by adjusting the position of thc trunion on
  • the plunger 136 will a i be driven downward far enough for the limit foot 158 on the upper frame 16 to engage the limit stud 154' and further downward movement will be'thereby prevented. a
  • the disc blade edge will and if necessary to achieve the proper sharpen
  • the disc 7 blade is removed and a new blade applied to' the mandril 62 in the manner previouslydescribed.
  • a masaid mandril means includes a mandril having a proxchine for sharpening disc blades which is fully Capable imal end mounted to said frame and a distal end of achieving the objects and providing the advantages" 5 disposed adjacent said grinding surface with dig heretofore attributed to it.
  • blade clamp means thereon said disc blade clamp I claim: means having a lock shaft interconnected with said l.
  • a machine forsharpening disc blades comprising: mandril with a Proximal and adjacent the Proximal a f end of said mandril and a'distal end adjacent the distal end of said mandril and disposed for reciprocating axial movement with respect to said mandril from an extended position with said distal end of said lock shaft extended outwardly from the distal end of said mandril to a retracted position with the distal end of said lock shaft substantially coextensive with the distal end of said mandril, and having a disc blade mounting plate on the distal end of said mandril, and further includes a lock plate releasably attachable to the distal end of said lock shaft to engage and clamp said disc blade against said disc blade mounting plate when said lock shaft is in its retracted position, and further includes drive means operatively associated with said mandril and said lock shaft and disposed to reciprocate said lock shaft as aforesaid. 4.
  • said mandril means includes a mandril having a proxgrinder means operatively associated with said frame; 0 said grinder means having a grinding surface disposable in a generally horizontal grinding plane and rotatable about an axis, said grinder surface having a configuration sufficient to grind the edges of a disc blade; 15 mandril means operatively associated with said frame and said grinder means, said mandril means includes a mandril housing with a mandril rotatable therein about an axis, said mandril having a proximal end disposed adjacent said frame and a distal end disposed adjacent said grinding plane, and disc blade mounting means on the distal end of said mandril disposed to releasably mount a disc blade for engagement by said grinder means; grinder mounting means mounting said grinder means in said frame for linear movement in alignment with said grinding surface axis and for pivotal movement to swing said grinder means between a work position with said grinding surface in said grinding plane and a rest position with said grinding surface remote from said grinding plane
  • mandril mounting means mounting said mandril means in said frame with the axis of said mandril means disposed to form an acute angle with said grinding plane, said mandril mounting means having arc adjustment means operable to pivot said mandril means about a pivot point disposed along the axis thereof to vary said acute angle between said grinding plane and said mandril axis, and axial adjustment means operable to vary the position of said pivot point along said mandril axis
  • said mandril mount-means including a pivotal mounting mounted on said mandril housing adjacent the proximal end of said mandril and supported in said frame, said pivotal mounting being movable axially with respect to said mandril housing in alignment with said mandril axis and being movable with respect to said frame to vary the distance between said point of support in said frame and said grinding plane.
  • said mandril mounting means further includes a trunnioned collar releasably clamped to said mandril housing adjacent said proximal end and axially movable on said housing for adjustment of said point of clamping, trunnion bearings on the trunnions of said collar, bearing housings operatively associated with said trunnion bearings and releasimal end and a distal end, a housing, a hollow drive shaft rotatably mounted in said housing, a disc blade mounting plate attached to the distal end of said drive shaft, a lock shaft disposed in the bore of said drive shaft and reciprocally movable with respect thercto from an extended position with the distal end of said lock shaft projecting outwardly beyond the distal end of said drive shaft to a retracted position with the distal end of said lock shaft substantially coextensive with the distal end of said drive shaft, a clamp plate releasably interlocked with the distal end of said lock shaft and
  • said axial adjustment means of said mandril mounting means includes a trunnioned collar releasably clamped to said mandril housing adjacent said proximal end and axially movable on said housing for adjustment of said point of clamping, trunnion bearings on thetrunnions of said collar, bearing housings operatively associated with said trunnion bearings and releasably attachable to said frame, elongated slots in said frame disposed to receive said trunnions andpermit movement of said trunnions in said slots upon release of said attachment of said bearing housings, all operatively associated to pivotally mount the proximal end of said mandril to said frame; and
  • said arc adjustment means of said mandril mounting means further includes a mandril slot operatively associated with the. distal en'd of said mandril in cludinga mandril slot operatively associated with said mandril housing and disposed substantially parallel to the axis of said.
  • a slot Opera 5 tively associated with said frame and disposed substantially parallel to an arcuate path described by the distal end of said mandriluponipivotal movement about said point of pivot mounting of said said grinder means includes a grinder means mounting'arm interconnected with said frame and pivotally movable with respectathereto to movesaid grinding surface from saidgrinding plane position 7 and extending axially and radiallyinwardly, a re- I tainer ring juxtaposed the face 'surfaceof said cav-- juxtaposed the peripheraledge of a disc blade mounted on said mandril to "a shut down position.
  • control means operatively associated with said grinder means mounting 7 arm and said frame and disposedto control the rate of pivotal movement of said arm with respect to 7 said frame whensaid grinding surface is juxtaposed 7 said disc blade peripheral edge.
  • a liquid reservoir disposed to submerge a disc blade
  • said grinder mounting means in ,ludes feed means periphery of a disc blade mounted on said mandril means at a controlled rate.
  • said liquid reservoir includes a liquid tank operatively' A associated with said frameand disposed to receive 8.
  • said liquid reservoir 'includes'a liquid tank operatively associated with said frame and disposed to receive a disc blade mounted on said mandril means with" a portion of said mandrilmeans projecting through V a wall of said liquid tank and movable with respect to said Wall, a liquid seal interconnected between A withsaid liquid tank and'said liquid supply means anddisposed to regulate the level of liquidin said liquid tanlcand an auxiliaryliquid conduit opera disposed to move'said grinder means against the .1 grinding surface.
  • s I w h h 1 3 A machine for sharpening disc blades comprising; a frame; a a A ally horizontalgrinding plane;
  • said retainer ring having adjustable, securing means disf A posed to tighten and loosen said retainer 1 ring againstsaid chuck faceisurface, and asplit ring disposed about the peripheryofsaid cavity and having I- an inner facedisposed to engagesaid grinding 1 A stone and a wedge on its outer face having tapered l A surfaces disposed forengagement by said'beveledg surfaces on said chuck and retainer ring to force' A said split ing radially inwardly against theperiph ⁇ 1 ery ofsaid grinding stone upon tightening. ofisa idA 1 retainer ring against said chuck face surface.
  • a rnandril ope'rativelyassociated with said frameand 7 saidgrinder means and axially disposed in acute I angular relationship with said grinding plane, said mandril having an upper end disposed adjacent saidgrin'der means and alower'end'disposed below A said upper end; and juxtaposed said frame, said a mandril having a disc blade mountingmeans disposed to mount a disc blade on the upper end.
  • a V .A V A mandril mounting meansinterconnected with said frame and said mandril and having a pivotal mount V ing'adjacent the lower end of sai'dmandril and disa posed to permit arcuate movement" of the upper end of said mandril to change the angular relation T I ship: between said mandril and said grinding sur:
  • a liquid containing tank operatively associated with said frame, mandril and grinding surface, and disposed about the upper end of said mandril for sub-' mersion of substantially all of a disc blade mounted on said mandril.
  • said grinder mounting means includes a grinder means mounting arm interconnected with said frame and pivotally movable with respect thereto to move said grinding surface from a grinding posiscribed in claim 13, in which: tion juxtaposed the peripheral edge of a disc blade said grinder means includes a drive motor having a I mounted on said mandril to a shut down position drive shaft interconnected therewith, and a grind-.
  • grinder means mounting arm for adjustment of the said grinder mounting means includes feed control proximity of said grinding surface to said disc blade means having a hydraulic ram interposed between peripheral edge, and feed control means operasaid grinder means and said frame and intercontively associated with said grinder means mounting nected with variable valve means disposed to reguarm and said frame and disposed to control the rate late the speed of travel of said ram.
  • said mandril includes a housing and a hollow drive
  • said mandril mounting means includes said pivotal shaft rotatably mounted in said housing, and said mounting being pivotal for arcuate movement of disc blade mounting means includes a disc blade said distal end of said mandril with respect to said mounting plate affixed to the upper end of said proximal end, and being releasably securedto said drive shaft inside said tank, a lock shaft disposed in mandril for axial adjustment with respect thereto to the bore of said hollow drive shaft, lock shaft drive vary the distance between said pivotal mounting means interconnected with said mandril housing andsaid mandril'distal end. and beingadjustably mounted to said frame for movement of said point of mounting toward and away from said grinder means.
  • said mandril mounting means includes a trunnioned mounting plate when said lock shaft is reciprocated to its retracted position.
  • level control means operatively associated with said liquid tank and said liqassociated to pivotally mount the proximal end of said mandril to said frame;
  • said mandril mounting means further includes arc positioning means operatively associated with the distal end of said mandril including a mandril slot operatively associated with the distal end of said mandril including a mandril slot operatively associated with said mandril housing and disposed substantially parallel to the axis of said mandril, ,a slot op- 17.
  • said liquid containing tank includes a liquid seal inby the distal end of said mandril upon pivotal terconnected betweensaid wall and said mandril, movement aboutsaid point of pivot mounting of liquid supply means interconnected with said liquid said mandril. and lock bolt means disposed in said mandril slot and frame slot and releasably lockable to secure said distal end of said mandril to said frame at a predetermined position along said arcuate path.
  • said mandril mounting means includes a trunnioned collar releasably clamped to said mandril housing uid supply means and disposed to regulate the level of liquid in said liquid tank, and an auxiliary liquid conduit operatively associated with said liquid supply means and said liquid tank and disposed to sup- V adjzicent saidlproximal end and axially: movable on said housing for adjustment of said point of clampe ing, trunnion bearings on the trunnions of said cob lar, bearing housings operatively associatedrwith o said trunnion bearingsand releasablyattachcd to said frame, elongated slots insaidifr amedispqsedi to receive said trunnions and permit movement of associated to pivotally mount the proximal end of said mandrilto said frame; and V V 7 said ma'ndril mounting means further includes arc po- '7 V sitioning means operatively associatedrwith the dis-

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

A machine for sharpening disc blades consisting of a base, a lower frame, and an upper frame. The upper frame has a drive motor which drives a vertically disposed shaft with a grinding stone mounted on the lower end. The lower frame has a mandril which extends upwardly toward the grinding stone with its support shaft disposed at an angle with respect to the grinding stone shaft. The angle of the mandril shaft with respect to the grinding stone shaft is variable by an adjustment mechanism and the upper end of the mandril has a clamp for securing disc blades to the mandril. The mandril is rotatably driven by a mandril drive motor mounted on the base. The upper end of the mandril shaft is disposed in a liquid tank so that the disc blade is submerged during the grinding contact, thus eliminating noise and flying chips. Effective sharpening of the disc blades is accomplished by rotating the mandril holding the disc blade more slowly than the grinding wheel is rotated and by varying the angle of contact between the disc blade edge and the grinding stone by adjusting the angle between the mandril shaft and the grinding wheel shaft.

Description

United States Patent Ruble July 29, 1975 MACHINE FOR SHARPENING DISC Primary ExaminerAl Lawrence Smith B ADES Assistant ExaminerNicholas P. Godici [76] Inventor: Lloyd J. Ruble, 225 S. California, Attorney Agent or Fnvmfivergll Gerard Tulare, [22] Filed: 1971 A machine for sharpening disc blades consisting of a [21] Appl 212,482 base, a lower frame. and an upper frame. The upper frame has a drive motor which drlves a vertically disi posed shaft with a grinding stone mounted on the [52] U.S. Cl 51/126; 5l/l32; 51/209 R; lower end The lowerv frame h a mandril which 51/266 tends upwardly toward the grinding stone with its sup- Illt. t h ft di d t an angIe respect In h [58] Field of Search 51/132, 106 R, 51, 356, grinding stone shaft. The angle of the mandril shaft 51/266, 124 L, 124 R, 209 R, 126, 237 R, 225 with respect to the grinding stone shaft is variable by an adjustment mechanism and the upper end of the [56] References Cited mandril has a clamp for securing disc blades to the UNITED S S P TS mandril. The mandril is rotatably driven by a mandril 762,399 6/1904 Goehring et d1v 51/266 x drive P T PPer end of 2,127,071 8/1938 Schmalz 51/51 x the m'flhdtll Shaft 18 fdlsposed hqutd tank 9 that 2,401,486 6/1946 Jones 51 106 R the (1186 blade IS Submerged during the grlhdihg 2,402,305 6/1946 Sutton" 51/106 R contact, thus eliminating noise and flying chips. Effec- 2,450,230 9/1948 Bush 51/209 R tive sharpening of the disc blades is accomplished by 2,528,193 lO/l950 Van Allen 51/51 X rotating the mandril the disc more 2,65l,l49 9/1953 Ferm. 5l/l06 R Slowly than the grinding wheel is rotated and by vary 2,747,339 Schelhng L the angle of Contact between the disc hade ge 513321233 55132? 11253121. fiiilijjjj .JJJ..7.S?J2 and the gnnning none by nninnnng nn nngln between the mandril shaft and the grinding wheel shaft.
20 Claims, 10 Drawing Figures PATENTED JUL 2 91975 SHEET PATENTED JUL29 I975 SHEU PATENTED JULZQ i975 SHEET MACHINE FOR SHARPENING DISC BLADES BACKGROUND OF INVENTION This invention relates generally to grinding machines and more particularly to machines for grinding the peripheral edges of concave disc blades.
Circular concave steel blades ganged together to form a disc are used for a variety of purposes, including plowing earth for farming and tearing up an asphalt road surface for replacement or repair. The peripheral edges of the disc blades are sharpened to provide the necessary cutting action in performance of their work and with use become dull and must be resharpened. The disc blades are made of hardened steel and resharpening, therefore, requires a substantial amount of grinding. Since the disc blades are circular and concave an effective resharpening job requires that the grinding stone be moved around the periphery of the blade at varying tangential angles to the blade surface so that the peripheral edge of the blade is given substantially the same amount and angle of grinding at each point. Normally, the surface of the grinding wheel first engages the peripheral edge of the blade with the plane of the wheel disposed only at a slight angle to a plane normal to the axis of the disc and as the sharpening progresses the grinding wheel surface is moved to a greater angle to the normal plane as the grinding cut moves outwardly to the outermost periphery of the blade.
Various machines and equipment have been utilized to perform this grinding function. These vary from vertically mounted grinding wheels with the disc blades mounted on a supporting shaft and held against the wheel surface and at an angle to the wheel by hand, to machines which support the disc and the grinding wheel and bring them together for abrasive contact by moving the disc blade or the grinding wheel or both.
Because of the hot particles chipped away from the blade during grinding in the form of sparks, the heat which the grinding friction generates in the blade, and the noise produced, it is desirable to hold the blade in water or some other liquid during grinding.
The equipment heretofore known has not been effective in combining all these desired features into a grinding machine which can be operated by a single operator efficiently and with satisfactory results.
It is, therefore, a major object of my invention to provide a machine for grinding disc blades which can be operated by a single operator and will produce the desired sharpening in a minimum amount of time.
Another object of my invention is to provide a machine for grinding disc blades of the type described in which the disc blades are submerged in liquid during the grinding operation to trap hot particles, keep the blade steel cool, and minimize noise.
A further object of my invention is to provide a.ma-: chine of the type described in which the disc is auto matically rotated during the sharpening operation to provide uniform contact between all points on the blade periphery and the grinding wheel.
Still another object of my invention is to provide a machine of the type described in which the mandril which mounts the disc blade is movable angularly with respect to the surface of the grinding stone to vary the tangential angle of contact between the grinding stone and the blade edge.
Yet a further object of my invention is to provide a machine of the type described in which the blades can be readily mounted and dismounted from the support mandril and the grinding stone can be readily changed.
Still a further object of my invention is to provide a machine of the type described which is relatively inexpensive to manufacture and requires a minimum of time and operator skill in use.
These and other objects of my invention will become more readily apparent from the following detailed description of a preferred embodiment and the accompanying drawings in which:
FIG. 1 is a side elevational view of a preferred embodiment of my invention;
FIG. 2 is a front elevational view of the machine shown in FIG. 1;
FIG. 3 is a sectional plan view taken on line 33 in FIG. 2;
FIG. 4 is a partial sectional side elevational view taken on line 44 in FIG. 2;
FIG. 5 is a partial sectional view taken on line 55 in FIG. 4;
FIG. 6 is an enlarged partial sectional view taken on line 66 in FIG. 4;
FIG. 7 is an exploded perspective view of the disc blade mounting mechanism in my preferred embodiment;
FIG. 8 is a partial sectional plan view taken on line 88 in FIG.,2 and showing the grinding wheel and its drive motor;
FIG. 9 is a schematic view of the hydraulic control for the grinder wheel feed mechanism; and
FIG. 10 is a partial sectional view taken on line 10-10 in FIG. 1.
Referring now to the drawings, and particularly FIGS. 1 and 2 thereof, the numeral 10 designates my disc blade grinding machine generally. The machine 10 has a base 12 witha lower frame 14 extending upwardly therefrom. The lower frame 14 is generally V- shaped upwardly and has a rearwardly, directed structural support portion 16. An upper frame 18 is mounted on the lower frame 14 by a hinge 20 connected to the upper end of the lower frame structural support 16.
The upper frame 18 has a grinding wheel support head 22 on its distal end with respect to the hinge 20. The grinding wheel support head 22 is disposed generally vertically and has a grinding wheel mounting plate 23, movably mounted thereon. The grinding wheel mounting plate 23 carries a grinding wheel drive motor 24 on its upper portion and a grinding wheel 26 on its lower portion. The grinding wheel, 26 is connected to a shaft 28 of the drive motor 24 by means of a coupling 30. Below the coupling 30, the drive shaft 28 passes through a bearing housing 32 with thrust bearings (not shown) which support the weight of the grinding wheel. The grinding wheel mounting plate 23 is secured to the grinding wheel support head 22 by a pair of mounting plate flanges 25 positioned on each side of the grinding wheel mounting plate 23. The mounting plate flanges 25 extend rearwardly, substantially normal to the grinding wheel mounting plate 23 and overlap support head flanges 27 on the grinding wheel support head 22. The mounting plate flanges 25 have vertically extending slots 29 which align with holes 31 in the support head flanges 27. Bolts 33 are disposed through the slots 29 and holes 31 to releasably secure the flanges together. A mounting plate lift frame 35 is attached to both sides of the grinding wheel mounting plate 23 and support head 22. Ahydraulic mounting'plate adjust" ment cylinder 37 is connected between the grinding wheel support head 22 and the mounting plate lift frame 35 and, upon actuation, moves the grinding wheel mounting plate 23 vertically with respect to the grinding wheel support head 22 when the bolts 23 are released to permit movement. Movement of the grinding wheel mounting plate 33 with respect to the grinding wheel support head 22 adjusts the vertical position of the grinding wheel 26 and compensates for wear as more fully explained later. The vertical adjustment position of the grinding wheel is indicated by a scale plate 39 mounted on the grinding wheel support head and disposed in indicating relationship with a pointer 40 mounted on the grinding wheel mounting plate (see FIGS. 2 and 8).
The grinding wheel 26 consists of a torodial grinding stone 34 mounted in a grinding wheel chuck 36 attached to the lower end of the shaft 28 below the bearing housing 32. As best shown in FIG. 6, the grinding wheel chuck 36 has a backing plate 38 connected to the shaft 28 with a peripheral rim 40 projecting normal thereto to provide a cavity 42. 'An annular retaining ring 44 is secured to the face of the peripheral rim 40 by bolts 45, and has a beveled surface 46 on its inner edge which tapers outwardly and upwardly toward the rim 40. The rim 40 has a beveled surface 47 on its inner edge which tapers outwardly and downwardly to meet the uppermost end of the surface 46 and form. a wedge shaped annular slot 48. A wedge shaped split ring 49 is disposed in the slot 48 and has mating surfaces which are engaged by the beveled surfaces 46 and 47. The beveled surfaces 46 and 47 are so disposed that tightening the bolts 45 to draw the annular. retaining ring 44 toward the rim 40 forces the split ring 49 radially inward into the cavity 42 to engage and grip the periphery of the grinding stone 34. To prevent damage to the grinding stone 34 by this griping action of the split ring 49, a gasket 50 is mounted on the periphery of the stone. The gasket 50 does not extend to the face of the stone so that it produces no interference with its grinding function, and further, even if the stone face is worn to the point where the gasket is exposed to the grinding area; the gasket merely wears off without effect on the grinding. The upper bevel 47 is made'very slight to avoid pressing the grinding stone upward into the chuck when the split ring'49 is driven inwardly.
The torodial grinding stone 34 has an outside diameter substantially the same as the inside diameter of the peripheral rim 40 on the grinding wheel chuck 36 and end of the mandril in an arcuate direction so that proper positioning of a disc blade with respect to the;
a thickness substantially greater than the depth of the cavity 42 so that the grinding stone can be fitted into the cavity and retained there by the grip ing actionof the jaw members 49, and when so retained the lower portion of the stone will project downwardly therefrom beyond the lowermost portion of the retaining ring 44.
The upper frame 18 is pivotally movable about the hinge 20 by means of a hydraulically operable grinding wheel contact cylinder 52 which is connected between the upper portion of the lower frame 14 and the distal .portion of the upper frame 18. In its lowermost pivotal position the upper frame rests upon the lower frame and the shaft 28 is positioned substantially vertical, disposing the lower surface of the grinding stone ina substantially horizontal plane. 133/ activation of the grinding wheel control cylinder 52, the upper frame can be moved. pivotally upward from the lower frame, tilting the lower end of the grinding wheel drive shaft 28 outwardly fromthe lower frame and swinging the lower surface of the grinding stone so that its plane is angularly offset from the horizontal. Swinging the upper frame 18 between its lower and upper positions thereby causes the lower surface of the grinding stone to trace an arcuate path. H
The pivotal movement of the upper frame 18 with re-' spect to the lower frame through activation of the grinding wheel control cylinder 52 is achieved by a grinding wheel position control 54 hereafter described in greater detail.
To protect the operator from injury, the grinding wheel is covered by a band-shaped guard 56 which leaves the lower surface of the grinding stone exposed for engagement with the disc blade. Below the grinding wheel and mounted on the lower frame'14 is a grinding wheel pan 58 into which the grinding wheel fitswhen;
the upper frame 18 is in its lowermost position. The grinding wheel pan. 58 has a semicircular lower surface which drops off into a tank 60. r
A disc blade support mandril 62 has an upper end 64 which projects upwardly into the tank 60 and has a lower end 66 which extends downwardly outsidethe tank toward the base 12 of the machine. The mandril 62 has a hollow. driveshaft 68 which is rotatably mounted in a mandril support housing701by means of 7 an upper end bearing 72 and a lower end bearing 74.
The mandril support housing has its upper end mounted in the lower frame 14 by means of amounting frame 76 which is secured to the lower frame by a locking stud 78. The locking stud 78 passes through an a cuate slot 80 in the lower frame and a vertically disposed linear slot 79 inthe mandril upper end 64. Alock I nut 82 is provided'to thread onto the locking stud=78 and secure the stud in a particularposition in the arcu ate slot. The lower end of the mandril support housing i 70 is mounted on the lower frame bymeans of a trun-. ion bearing 84 which permits movement of the upper grinding wheel 26 can be achieved, as'later explained.
The trunion bearing '84 is mounted on the mandril.
support housing 70 by means of a releasable clamping band 81 secured bya bandbolt 83 (see FIG. 10). Since the clamping band'8l is releasable by means of the band bolt 83 it isslidable up or down on the mandril support housing 70 to adjust its mounting point. Also,;-
the stub shafts 85 of the trunion bearing 84' are mounted to the lower frarne14 by means of bearing caps 87 which are secured to the frame by bearing cap 1 bolts 89. (See FIGS. 1 and 2) The bearing cap bolts 89 4 y are mounted in frame slots 91in the lower frame which are generally aligned with theaxis of the mandril support housing 70, so that the mounting point ofthe stub w shafts 85 in the lower frame 14 is also adjustable. The adjustabiiity of the clamping band 81 on the mandril housing70 and the stub shafts 85 in the lower frame 14 permit adjustmentiof both the radius and. thecenter point of the arcuate movement of the upper end 14 of the mandril, as more fully explained later.-
The upper end of the mandrilsupport provided about the opening 86 to prevent leakage of liquid from the tank 60. The seal consists of a flanged collar 90 disposed normal to the driveshaft of the mandril and mounted on the upper end of the mandril support housing 70. The collar 90 is of sufficient size to overlap the peripheral edges of the opening 86 through which the mandril support housing passes and to permit movement of the mandril support housing in the opening without exposing the opening for the tank.
To rotate the mandril driveshaft 68, a drive pulley 92 is provided on a power transfer shaft 93 adjacent the lower end of the mandril 62 and is driven by a mandril drive motor 94 through a drive belt 96 (see FIG. 1). The mandril 62 is, in turn, driven by the power transfer shaft 93 through a chain and sprocket drive 97.
To hold a disc blade on the upper end of the mandril 62, a lock shaft 98 is provided in the bore of the;man-.
dril driveshaft 68. The lock shaft 98 moves reciprocally in the mandril driveshaft bore from an extended position in which the upper end of the lockshaft projects upwardly beyond the upper end 64 of the mandril, to a retracted position where the upper end of the lock shaft is withdrawn into the upper end of the mandril. The reciprocal movement of the lockshaft 98 is powered by a hydraulically actuated piston 100 attached to the lower end of the lockshaft and enclosed by a housing 102. The piston 100 is biased by a spring 104 to drive the lockshaft upwardly and is powdered hydraulically to drive the lock shaft downward against the spring bias in a manner well known in the art (see FIG. I).
At the uppermost end of the lockshaft, a sloted head 106 is formed which cooperates with a lock plate 108 to lock disc blades to the lockshaft. The lock plate 108 has a square center bore 110 which fits over the square flange 112 on the sloted head 106 but is locked on the head by one quarter rotation in the slots 114 (see FIG. 7). The slotted head 106 is small enough to pass through the bore in a disc blade but the lock plate is 7 larger than the disc blade bore so that when the slotted head 106 is moved to its upper position a disc blade may be mounted on the lockshaft by inserting the slotted head through the disc blade bore, setting the lock plate 108 over the slotted head and rotating it one quarter turn to lock it in the slots 114 and then retracting the lockshaft 98 to engage the upper surface of of the blade with the lock plate. To support the lower surface of the disc blade and provide secure clamping of the disc blade to the blade and provide secure clamping of the disc blade to the mandril 62,a mandril mounting plate 116 is affixed to the mandril driveshaft 68 at its upper end. The mandril mounting plate 116 projects radially outward from the mandril drive shaft a distance sufficient to provide a secure mounting base for the disc blade but less than the disc blade diameter to avoid interference with the grinding of the peripheral edges (see FIG. 4).
The disc blade is thus clamped between the lock plate 108 engaged in the slots 114 on the slotted head 106 on the upper end of the lockshaft and the periphery of the mandril mounting plate 116 on the upper end of the mandril driveshaft, when the lockshaft is driven to its retracted position by actuation of the piston 100.
To vary the angular dispostion of the axis of mandril 62, a mandril position cylinder 118 is provided. The mandril position cylinder 118 is hydraulically actuated and is connected between the lower frame 14 and the upper end 64 of the mandril, so that extension of the cylinder arm drives the upper end 64 downwardly and retraction draws it upwardly along the arc defined by the arcuate slot 80. The locking stud 78 and its locknut 82 releasably secure the mandril upper end 64 in its desired position, and the vertically disposed linear slot 79 allows adjustment of the locking stud 78 in the mandril upper end 64 during its arcuate movement in slot 80.
The tank 60 is filled with water by means of a water supply system 120. The water supply system 120 includes a reservoir 122, and a water pump 124 (see FIG. 2). The reservoir 122 is connected to the tank 60 by means of a main supply line 126, a return line 128, and an upper supply line which branches off of the main supply line and deliverswater under pressure to the grinding wheel pan 58 by means of a nozzle 132.
The nozzle 132 directs water against the lower surface of the grinding stone 34 so that the point of grinding ac- 7 tion is cooled and the generated sparks are contained and noise controlled (see FIG. 4). The water delivered by the nozzle 132 runs off from the grinding wheel pan 58 into the tank 60. A flow control valve 134 is provided in the return line 128 to control the water. circulation and maintain the water in tank 60 at a constant level. Regulation of the flow control valve 134 with the capacity of the pump 124 will assure prompt filling and emptying of the tank 60 and will limit the high water level to the height of the grinding wheel pan 58. To remove any excess water from the grinding wheel pan 58 an overflow drain 133 is provided.
The grinding Wheel position control 54 consists of a control plunger 136 mounted in a cylinder 138 on the upper surface of the lower frame 14 (see FIGS. 1 and 9). The plunger 136 is biased to an upper position by a spring 140 in the cylinder 138. The cylinder 138 is filled with hydraulic fluid and has bypass lines 142 which connect the upper portion of the cylinder to its lower portion through a control valve 144. The control valve 144 permits fluid flow from the lower to the upper portion of cylinder 138 at a controlled rate so that the travel of the plunger 136 from its upper position to its lower position in cylinder 138 against the bias of spring 140 is restricted in speed. A check valve 146 is provided which is a one-way valve and permits free flow of fluid from the upper to lower portions of cylinder 138, for free return of the piston to its upper position. Thus, after the plunger 136 has been driven to its lower position in the cylinder 138, it can be quickly returned to its upper position under the bias of spring 140 as soon as the driving pressure on the piston is released. The control valve 144 is regulated by a control valve solenoid 148. The solenoid 148 can be electrically connected with the drive motor 24 so that the feed rate of the grinding wheel is controlled by the load on the motor.
The plunger 136 of the grinding wheel position control 54 is engaged by a control foot 150 on the upper frame 16 when the upper frame is lowered into grinding position by the grinding wheel cylinder 52, and controls further downward movement of the grinding wheel 26. To limit the extent of downward movement of the grinding wheel 26, a limit stop 152 is provided on the upper surface of the lower frame 14 adjacent the grinding wheel position control 54. The limit stop 152 consists of a limit stud 154 which is vertically adjustable by threading in a stud base 156 on the lower frame 14, and is engaged by a limit foot 158 on the upper frame 16.
A limit stop adjustment wheel 160 is provided to readily adjust the position of the limit stud 154 through a a worm gear (now shown). t
To provide actuation for the hydraulic controls and I actuators, a hydraulic pump 162isprovided on base 12' which is driven by an electric motor 164- and supplies hydraulic fluid through lines 166. V j
7 To controlthe hydraulic actuators, control valves are also provided on a platform 168 at a convenient posi- 7' ,tion on the machine (see FIG. 2). These control valves include a grinding wheel position control; valve 170 which controls the actuation of the grinding wheel positioning cylinder 52, a lockshaft' control valve 172 which controls the reciprocal positioning of the lockshaft 98 through piston 100 in cylinder 102,-and a mandril position control valve 174 which controls the angular dispostion of the axis of the mandril 62 through mandril position cylinder 118. A control valve for the bypass valve control 148 and electric switches for controlling the hydraulic pump drive motor 164, the water pump 124, the grinding wheel drive motor 2 4, and the manthe mandril housing and the lower frame. When the proper contact angle is established between the lower surface of the grinding stone 34 and the peripheral edge of the disc blade to provide the desired sharpening, the rmandril is locked in thisposition by tightening I I the lock nut 82 on the locking stud 78, and the mandril positioning cylinder 118 is deactivated. t
The grinding wheel is then raised again by the grinding wheel'p osition controlvalve 170, and the grinding wheel position control is set forthe desired feed rate. Also, the limit stop 152 is adjustedto the desired maxi mum depth of cut.
With the machine drive motor 24, and the mandril drive motor 94, are
and the disc blade o By proper drive connection means the grinding stone 7 34 is made to rotate many times faster than the disc dril dri ve motor 94, are provided at other appropriate,
jecting through the bore in the center of the disc bladeI During this installation the grinding wheel 26 is swung to' its upper position, away from the point of installa blade so that adequate grinding is provided along the peripheral edge of the blade.
Next, the grinding wheel is lowered by grinding wheel, i
position control valve 170 into contact withthe peripheral'edge of the disc blade and the water pump 124isstarted so that the tank 60 is filled and awater spray is t delivered to the point of contact by'the nozzle 132. t
As the grinding wheel 26'reaches its lower position,
the control foot 150 on the upper frame 16eng'ages the I plunger 136 of the grinding wheel position control 54 i a and the Weight of the'upper frame drives the plunger tion, by pivoting the upper frame 16 upwardly about the hinge 20 by actuation of the grinding wheel positioning cylinder 52 (see FIG. 1). The lockshaft 98 of the mandril 62 is reciprocated to its upward position with the slotted head 108 projecting above the upper downward in the cylinder 138. Since the fluid inthe cylinder 138 must transfer from the lower to the upper portion of the cylinder through the control valve 144 in order for the plunger 136 to move downwardly, the" speed of downward movement of the upper frame, and,
therefore, of the grindingwheehis controlled by the 8 control valve.
end of the mandril, by release of the piston 100 in the cylinder 102 to the biasing of spring 104. And, the grinding wheel position control 54 is reset by raising the grinding'wheel head to permit plungeril36to be driven to its upper position by the bias spring 140. Also,
though the water pump 124 and the hydraulic pump drive motor 164 are in operation, the grinding wheel 7 drive motor 24'and the mandril drive motor 94 are off. I
With the disc blade positioned on the upper end 64 of the mandril 62 and over the slotted head 1060f the lockshaft 98, as described, the blade is brought to rest on the mandril mounting plate 116. The lock plate 108 is then placed over the slotted'head 106 and rotated a quarter turn to secure it in the slots 114. Next, the lock- I shaft control valve is actuated to draw the lockshaft 98 downward by action of hydraulic fluid on the piston 100, and thus clamp the disc blade on the upper end 64 of the mandril between the locking plate 108 and the mandril mounting plate 116; it 7 With the grinding wheel drive motor 24 still off, the grinding wheel is then lowered into contact position with the disc blade and the angular and axial disposition of the mandril axis adjusted by releasing the lock nut 82 on locking stud 78 and tilting the mandril upper end 64 in the trunion bearing 84 by means of mandril positioning cylinder 118 and its control valve 174, and 7 if necessary, by adjusting the position of thc trunion on When sufficienttime has passed the plunger 136 will a i be driven downward far enough for the limit foot 158 on the upper frame 16 to engage the limit stud 154' and further downward movement will be'thereby prevented. a At this point, the disc blade edge will and if necessary to achieve the proper sharpening, the
' grinding operation can be recycled with the bladeedge positioned at a different angle to the, stone surface by resetting the angulardi'sposition of the mandril axis.
When the desired sharpening is achieved, the disc 7 blade is removed anda new blade applied to' the mandril 62 in the manner previouslydescribed.
It will be understood,of course, that duringthe grinding operation, all of thedisc blade except the small portion at the point of contact with the stone will be submerged in the water in tank 60, and even'the portion atthe point of contact will be subject to water spray from the nozzle 132., The sparks, noise andheat normally which accompany grinding will, therefore, be'virtually eliminated.
7 Furthermore, it will be seen that disc without any substantial manual effortl When the grinding stone 34 becomes sufficiently I I worn to merit it, a new stone can be applied by merely loosening the bolts which hold the retaining rirnt44 'of the grinding wheel chuck 36 to release the worn stone, inserting a new stone banded with the gasket thus set up, the grinding wheel turned on to commence rotation, of thegrinding stone be inspected blades can be p rapidly applied to andremoved'from: my machine, the I grinding can be carefully controlled as to both rate and angle, and all this c'an be achieved by one operator,
and securing it in the chuck by tightening the bolts 45 3. A machine for sharpening disc blades as described to drive the split ring 49 against the gasket. in claim 1, in which:
it will thus be understood that l have provided a masaid mandril means includes a mandril having a proxchine for sharpening disc blades which is fully Capable imal end mounted to said frame and a distal end of achieving the objects and providing the advantages" 5 disposed adjacent said grinding surface with dig heretofore attributed to it. blade clamp means thereon, said disc blade clamp I claim: means having a lock shaft interconnected with said l. A machine forsharpening disc blades comprising: mandril with a Proximal and adjacent the Proximal a f end of said mandril and a'distal end adjacent the distal end of said mandril and disposed for reciprocating axial movement with respect to said mandril from an extended position with said distal end of said lock shaft extended outwardly from the distal end of said mandril to a retracted position with the distal end of said lock shaft substantially coextensive with the distal end of said mandril, and having a disc blade mounting plate on the distal end of said mandril, and further includes a lock plate releasably attachable to the distal end of said lock shaft to engage and clamp said disc blade against said disc blade mounting plate when said lock shaft is in its retracted position, and further includes drive means operatively associated with said mandril and said lock shaft and disposed to reciprocate said lock shaft as aforesaid. 4. A machine for sharpening disc blades as described in claim 1, in which:
said mandril means includes a mandril having a proxgrinder means operatively associated with said frame; 0 said grinder means having a grinding surface disposable in a generally horizontal grinding plane and rotatable about an axis, said grinder surface having a configuration sufficient to grind the edges of a disc blade; 15 mandril means operatively associated with said frame and said grinder means, said mandril means includes a mandril housing with a mandril rotatable therein about an axis, said mandril having a proximal end disposed adjacent said frame and a distal end disposed adjacent said grinding plane, and disc blade mounting means on the distal end of said mandril disposed to releasably mount a disc blade for engagement by said grinder means; grinder mounting means mounting said grinder means in said frame for linear movement in alignment with said grinding surface axis and for pivotal movement to swing said grinder means between a work position with said grinding surface in said grinding plane and a rest position with said grinding surface remote from said grinding plane; and
mandril mounting means mounting said mandril means in said frame with the axis of said mandril means disposed to form an acute angle with said grinding plane, said mandril mounting means having arc adjustment means operable to pivot said mandril means about a pivot point disposed along the axis thereof to vary said acute angle between said grinding plane and said mandril axis, and axial adjustment means operable to vary the position of said pivot point along said mandril axis, said mandril mount-means including a pivotal mounting mounted on said mandril housing adjacent the proximal end of said mandril and supported in said frame, said pivotal mounting being movable axially with respect to said mandril housing in alignment with said mandril axis and being movable with respect to said frame to vary the distance between said point of support in said frame and said grinding plane.
2. A machine for sharpening disc blades as described in claim 1, in which:
said mandril mounting means further includes a trunnioned collar releasably clamped to said mandril housing adjacent said proximal end and axially movable on said housing for adjustment of said point of clamping, trunnion bearings on the trunnions of said collar, bearing housings operatively associated with said trunnion bearings and releasimal end and a distal end, a housing, a hollow drive shaft rotatably mounted in said housing, a disc blade mounting plate attached to the distal end of said drive shaft, a lock shaft disposed in the bore of said drive shaft and reciprocally movable with respect thercto from an extended position with the distal end of said lock shaft projecting outwardly beyond the distal end of said drive shaft to a retracted position with the distal end of said lock shaft substantially coextensive with the distal end of said drive shaft, a clamp plate releasably interlocked with the distal end of said lock shaft and disposed to engage a disc blade about its center opening and clamp said disc blade to said disc blade mounting plate when said lock shaft is reciprocated to its retracted position, lock shaft drive means op eratively associated with said drive shaft and mandril housing and actuable to reciprocally drive said lock shaft between said extended and retracted positions, and drive shaft drive means operatively associated with said mandril housing and said drive shaft and disposed to rotate said drive shaft and a disc blade mounted thereon; and
said axial adjustment means of said mandril mounting means includes a trunnioned collar releasably clamped to said mandril housing adjacent said proximal end and axially movable on said housing for adjustment of said point of clamping, trunnion bearings on thetrunnions of said collar, bearing housings operatively associated with said trunnion bearings and releasably attachable to said frame, elongated slots in said frame disposed to receive said trunnions andpermit movement of said trunnions in said slots upon release of said attachment of said bearing housings, all operatively associated to pivotally mount the proximal end of said mandril to said frame; and
said arc adjustment means of said mandril mounting means further includes a mandril slot operatively associated with the. distal en'd of said mandril in cludinga mandril slot operatively associated with said mandril housing and disposed substantially parallel to the axis of said. mandril, a slot Opera 5 tively associated with said frame and disposed substantially parallel to an arcuate path described by the distal end of said mandriluponipivotal movement about said point of pivot mounting of said said grinder means includes a grinder means mounting'arm interconnected with said frame and pivotally movable with respectathereto to movesaid grinding surface from saidgrinding plane position 7 and extending axially and radiallyinwardly, a re- I tainer ring juxtaposed the face 'surfaceof said cav-- juxtaposed the peripheraledge of a disc blade mounted on said mandril to "a shut down position. with said grinding surface removed from juxtaposi tion with said disc blade peripheral edge, a grinder means mounting plate movably mounted on said grinder means mounting arm for adjustmentof the proximity of said grinding surface to said disc blade peripheral edge, and feed. control means ,operatively associated with said grinder means mounting 7 arm and said frame and disposedto control the rate of pivotal movement of said arm with respect to 7 said frame whensaid grinding surface is juxtaposed 7 said disc blade peripheral edge. e
.6. A machine for sharpening disc bladesas described A in claim 1, which further includes: 7 V
a liquid reservoir disposed to submerge a disc blade;
mounted on the distal end of said mandril.
7.'A machine for sharpening'disc blades as described in'claim l, in which:
said grinder mounting means in ,ludes feed means periphery of a disc blade mounted on said mandril means at a controlled rate. I
in claim 6, in which:
said liquid reservoir includes a liquid tank operatively' A associated with said frameand disposed to receive 8. A machine for sharpening disc blades as described 1 a'disc blade mounted on said mandril means, and liquid supply means interconnected with said liquid I tank and disposed to supplyliquid thereto to a level sufficient to submergesubstantially all of said discblade.
9 A machine for sharpeningdisc bladesas described in'claim 6, in which: c
said liquid reservoir'includes'a liquid tank operatively associated with said frame and disposed to receive a disc blade mounted on said mandril means with" a portion of said mandrilmeans projecting through V a wall of said liquid tank and movable with respect to said Wall, a liquid seal interconnected between A withsaid liquid tank and'said liquid supply means anddisposed to regulate the level of liquidin said liquid tanlcand an auxiliaryliquid conduit opera disposed to move'said grinder means against the .1 grinding surface. s I w h h 1 3,. A machine for sharpening disc blades comprising; a frame; a a A ally horizontalgrinding plane;
. tivelyassociatedwith saidliquidsupplymeansand saidliquidtankand' disposed tosupply'a streamiof liquid to the pointof contactubetweensaid grinding: j
surface and said disc blade peripheral edge.
10; A machine for sharpening disc. blades as. de -d I 7 scribed inclaim l, inwhich: s I V a j 1 g saidgrinder means includes grinderdrive means, a
11. A machine for sharpening disc blades as de- ,A AA scribed in claim 10, in whichi A saidigrinder chuck releasable clamping means in eludes an annular facesurface surrounding said cavityand disposed substantially normalstoi the.
wall's' of said cavity' and a beveled surface inter- 1 posed between said cavity wallsof said face surface.
ity with a beveled surface on itsiinner face extend I ing axiallyinwardly'and radially outwardly, said retainer ring having adjustable, securing means disf A posed to tighten and loosen said retainer 1 ring againstsaid chuck faceisurface, and asplit ring disposed about the peripheryofsaid cavity and having I- an inner facedisposed to engagesaid grinding 1 A stone and a wedge on its outer face having tapered l A surfaces disposed forengagement by said'beveledg surfaces on said chuck and retainer ring to force' A said split ing radially inwardly against theperiph} 1 ery ofsaid grinding stone upon tightening. ofisa idA 1 retainer ring against said chuck face surface.
12.'A machine forjsharpening discblades as'de- A scribed in claim'iin whichi J i said grinder meansincludes grinder drivemeans, a I grinderchuckdrivingly interconnected with said I grinder drive means and having a circular cavity A and releasable clamping means'and a circular. AA
grinding stone secured in said chuck cavity by said releasable clamping meanswithan exposedplanarq grinder means operatively associated with saidframe and having a grindingsurface disposable in agen'en A grinder mounting means interconnected withwsaid 7 frame and said grinder means and disposed to movably mount said grinder meansonsaid frame; g
a rnandril ope'rativelyassociated with said frameand 7 saidgrinder means and axially disposed in acute I angular relationship with said grinding plane, said mandril having an upper end disposed adjacent saidgrin'der means and alower'end'disposed below A said upper end; and juxtaposed said frame, said a mandril having a disc blade mountingmeans disposed to mount a disc blade on the upper end. A
thereof; A V .A V A mandril mounting meansinterconnected with said frame and said mandril and having a pivotal mount V ing'adjacent the lower end of sai'dmandril and disa posed to permit arcuate movement" of the upper end of said mandril to change the angular relation T I ship: between said mandril and said grinding sur:
face, and said pivotal mounting being axially movable with respect to said mandril'to change the radius of said arcuate movement; and
a liquid containing tank operatively associated with said frame, mandril and grinding surface, and disposed about the upper end of said mandril for sub-' mersion of substantially all of a disc blade mounted on said mandril.
14. A machine for sharpening disc blades as deand said lock shaft and actuatable to axially reciprocate said lock shaft from an extended position with the upper end of said lock shaft projecting up- 18. A machine for sharpening disc blades as de- 5 scribed in claim 13, in which:
said grinder mounting means includes a grinder means mounting arm interconnected with said frame and pivotally movable with respect thereto to move said grinding surface from a grinding posiscribed in claim 13, in which: tion juxtaposed the peripheral edge of a disc blade said grinder means includes a drive motor having a I mounted on said mandril to a shut down position drive shaft interconnected therewith, and a grind-. with said grinding surface removed from juxtaposiing wheel mounted on said shaft and having a tion with said disc blade peripheral edge, a grinder grinding stone and a chuck disposed to releasably means-mounting plate movably mounted on said mount said grinding stone; and grinder means mounting arm for adjustment of the said grinder mounting means includes feed control proximity of said grinding surface to said disc blade means having a hydraulic ram interposed between peripheral edge, and feed control means operasaid grinder means and said frame and intercontively associated with said grinder means mounting nected with variable valve means disposed to reguarm and said frame and disposed to control the rate late the speed of travel of said ram. 30 of pivotal movement of said arm with respect to 15. A machine for sharpening disc blades as dei said frame when said grinding surface is juxtaposed scribed in claim 13, in which: said disc blade peripheral edge; and
said mandril includes a housing and a hollow drive said mandril mounting means includes said pivotal shaft rotatably mounted in said housing, and said mounting being pivotal for arcuate movement of disc blade mounting means includes a disc blade said distal end of said mandril with respect to said mounting plate affixed to the upper end of said proximal end, and being releasably securedto said drive shaft inside said tank, a lock shaft disposed in mandril for axial adjustment with respect thereto to the bore of said hollow drive shaft, lock shaft drive vary the distance between said pivotal mounting means interconnected with said mandril housing andsaid mandril'distal end. and beingadjustably mounted to said frame for movement of said point of mounting toward and away from said grinder means.
wardly beyond said disc blade mounting plate to a retracted position with the upper end of saidlock shaft substantially co-extensive with said disc blade 19. A, machine for sharpening disc blades as describedin claim '13, in which:
said mandril mounting means includes a trunnioned mounting plate when said lock shaft is reciprocated to its retracted position.
collar releasably clamped to said mandril housing adjacent said proximal end and axially movable on said housing for adjustment of said point of clamping. trunnion hearings on the trunnions of said collar, bearing housings operatively associated with said trunnion bearings and releasably attachable to said frame. elongated slots in said frame disposed 16. A machine for sharpening disc blades as deto receive said trunnions and permit movement of scribed in claim 13 in which:
said pivotal mounting of said mandril mounting I tachment of said bearing housingsall'operatively said trunnions in said slots upon. releaserofsaid atof mounting toward and away from said grinder,
means.
tank and disposed to supply liquid to said liquid tank to a level sufficient to submerge substantially all of said disc blade, level control means operatively associated with said liquid tank and said liqassociated to pivotally mount the proximal end of said mandril to said frame; and
said mandril mounting means further includes arc positioning means operatively associated with the distal end of said mandril including a mandril slot operatively associated with the distal end of said mandril including a mandril slot operatively associated with said mandril housing and disposed substantially parallel to the axis of said mandril, ,a slot op- 17. A machine for sharpening disc blades as deeratively associated with said frame and disposed scribed in claim 13 in which: substantially parallel. to an arcuate path described said liquid containing tank includes a liquid seal inby the distal end of said mandril upon pivotal terconnected betweensaid wall and said mandril, movement aboutsaid point of pivot mounting of liquid supply means interconnected with said liquid said mandril. and lock bolt means disposed in said mandril slot and frame slot and releasably lockable to secure said distal end of said mandril to said frame at a predetermined position along said arcuate path. I
20. A machine for sharpening disc blades as described in claim 15, in which:
said mandril mounting means includes a trunnioned collar releasably clamped to said mandril housing uid supply means and disposed to regulate the level of liquid in said liquid tank, and an auxiliary liquid conduit operatively associated with said liquid supply means and said liquid tank and disposed to sup- V adjzicent saidlproximal end and axially: movable on said housing for adjustment of said point of clampe ing, trunnion bearings on the trunnions of said cob lar, bearing housings operatively associatedrwith o said trunnion bearingsand releasablyattachcd to said frame, elongated slots insaidifr amedispqsedi to receive said trunnions and permit movement of associated to pivotally mount the proximal end of said mandrilto said frame; and V V 7 said ma'ndril mounting means further includes arc po- '7 V sitioning means operatively associatedrwith the dis- I tail end of said inandril including amandrilsl ot op f I I f l I eratiiiely associated with" said mz indriihousing and i i disposed substantially parallelit'ofthe' axisof said -mdndril *a frame -slot roperatively i associated with f said frame and disposed substantially parallel to anf V rarc uate path described by therdistalend {of said {mandril upon pivotal moy'ementabout said point of W pivot mount'ingxofsaid,mandrilQpand lock bolt 1 means disposed'in saidmiindril slot and frame slot and releasably lockztblel to secure said distal 'end of said mandril to said frame ata, predetermined position alongsaidarcu ate path. v i V 1

Claims (20)

1. A machine for sharpening disc blades comprising: a frame; grinder means operatively associated with said frame; said grinder means having a grinding surface disposable in a generally horizontal grinding plane and rotatable about an axis, said grinder surface having a configuration sufficient to grind the edges of a disc blade; mandril means operatively associated with said frame and said grinder means, said mandril means includes a mandril housing with a mandril rotatable therein about an axis, said mandril having a proximal end disposed adjacent said frame and a distal end disposed adjacent said grinding plane, and disc blade mounting means on the distal end of said mandril disposed to releasably mount a disc blade for engagement by said grinder means; grinder mounting means mounting said grinder means in said frame for linear movement in alignment with said grinding surface axis and for pivotal movement to swing said grinder means between a work position with said grinding surface in said grinding plane and a rest position with said grinding surface remote from said grinding plane; and mandril mounting means mounting said mandril means in said frame with the axis of said mandril means disposed to form an acute angle with said grinding plane, said mandril mounting means having arc adjustment means operable to pivot said mandril means about a pivot point disposed along the axis thereof to vary said acute angle between said grinding plane and said mandril axis, and axial adjustment means operable to vary the position of said pivot point along said mandril axis, said mandril mount-means including a pivotal mounting mounted on said mandril housing adjacent the proximal end of said mandril and supported in said frame, said pivotal mounting being movable axially with respect to said mandril housing in alignment with said mandril axis and being movable with respect to said frame to vary the distance between said point of support in said frame and said grinding plane.
2. A machine for sharpening disc blades as described in claim 1, in which: said mandril mounting means further includes a trunnioned collar releasably clamped to said mandril housing adjacent said proximal end and axially movable on said housIng for adjustment of said point of clamping, trunnion bearings on the trunnions of said collar, bearing housings operatively associated with said trunnion bearings and releasably attachable to said frame, elongated slots in said frame disposed to receive said trunnions and permit movement of said trunnions in said slots upon release of said attachment of said bearing housings, all operatively associated to pivotally mount the proximal end of said mandril to said frame.
3. A machine for sharpening disc blades as described in claim 1, in which: said mandril means includes a mandril having a proximal end mounted to said frame and a distal end disposed adjacent said grinding surface with disc blade clamp means thereon, said disc blade clamp means having a lock shaft interconnected with said mandril with a proximal end adjacent the proximal end of said mandril and a distal end adjacent the distal end of said mandril and disposed for reciprocating axial movement with respect to said mandril from an extended position with said distal end of said lock shaft extended outwardly from the distal end of said mandril to a retracted position with the distal end of said lock shaft substantially coextensive with the distal end of said mandril, and having a disc blade mounting plate on the distal end of said mandril, and further includes a lock plate releasably attachable to the distal end of said lock shaft to engage and clamp said disc blade against said disc blade mounting plate when said lock shaft is in its retracted position, and further includes drive means operatively associated with said mandril and said lock shaft and disposed to reciprocate said lock shaft as aforesaid.
4. A machine for sharpening disc blades as described in claim 1, in which: said mandril means includes a mandril having a proximal end and a distal end, a housing, a hollow drive shaft rotatably mounted in said housing, a disc blade mounting plate attached to the distal end of said drive shaft, a lock shaft disposed in the bore of said drive shaft and reciprocally movable with respect thereto from an extended position with the distal end of said lock shaft projecting outwardly beyond the distal end of said drive shaft to a retracted position with the distal end of said lock shaft substantially coextensive with the distal end of said drive shaft, a clamp plate releasably interlocked with the distal end of said lock shaft and disposed to engage a disc blade about its center opening and clamp said disc blade to said disc blade mounting plate when said lock shaft is reciprocated to its retracted position, lock shaft drive means operatively associated with said drive shaft and mandril housing and actuable to reciprocally drive said lock shaft between said extended and retracted positions, and drive shaft drive means operatively associated with said mandril housing and said drive shaft and disposed to rotate said drive shaft and a disc blade mounted thereon; and said axial adjustment means of said mandril mounting means includes a trunnioned collar releasably clamped to said mandril housing adjacent said proximal end and axially movable on said housing for adjustment of said point of clamping, trunnion bearings on the trunnions of said collar, bearing housings operatively associated with said trunnion bearings and releasably attachable to said frame, elongated slots in said frame disposed to receive said trunnions and permit movement of said trunnions in said slots upon release of said attachment of said bearing housings, all operatively associated to pivotally mount the proximal end of said mandril to said frame; and said arc adjustment means of said mandril mounting means further includes a mandril slot operatively associated with the distal end of said mandril including a mandril slot operatively associated with said mandril housing and disposed substantially parallel to the axis of said mandril, a slot operatively associated with said frame and disposed substantially parallel to an arcuAte path described by the distal end of said mandril upon pivotal movement about said point of pivot mounting of said mandril, and lock bolt means disposed in said mandril slot and frame slot and releasably lockable to secure said distal end of said mandril to said frame at a predetermined position along said arcuate path.
5. A machine for sharpening disc blades as described in claim 4, in which: said grinder means includes a grinder means mounting arm interconnected with said frame and pivotally movable with respect thereto to move said grinding surface from said grinding plane position juxtaposed the peripheral edge of a disc blade mounted on said mandril to a shut down position with said grinding surface removed from juxtaposition with said disc blade peripheral edge, a grinder means mounting plate movably mounted on said grinder means mounting arm for adjustment of the proximity of said grinding surface to said disc blade peripheral edge, and feed control means operatively associated with said grinder means mounting arm and said frame and disposed to control the rate of pivotal movement of said arm with respect to said frame when said grinding surface is juxtaposed said disc blade peripheral edge.
6. A machine for sharpening disc blades as described in claim 1, which further includes: a liquid reservoir disposed to submerge a disc blade mounted on the distal end of said mandril.
7. A machine for sharpening disc blades as described in claim 1, in which: said grinder mounting means includes feed means disposed to move said grinder means against the periphery of a disc blade mounted on said mandril means at a controlled rate.
8. A machine for sharpening disc blades as described in claim 6, in which: said liquid reservoir includes a liquid tank operatively associated with said frame and disposed to receive a disc blade mounted on said mandril means, and liquid supply means interconnected with said liquid tank and disposed to supply liquid thereto to a level sufficient to submerge substantially all of said disc blade.
9. A machine for sharpening disc blades as described in claim 6, in which: said liquid reservoir includes a liquid tank operatively associated with said frame and disposed to receive a disc blade mounted on said mandril means with a portion of said mandril means projecting through a wall of said liquid tank and movable with respect to said wall, a liquid seal interconnected between said wall and said mandril means, liquid supply means interconnected with said liquid tank and disposed to supply liquid to said liquid tank to a level sufficient to submerge substantially all of said disc blade, level control means operatively associated with said liquid tank and said liquid supply means and disposed to regulate the level of liquid in said liquid tank, and an auxiliary liquid conduit operatively associated with said liquid supply means and said liquid tank and disposed to supply a stream of liquid to the point of contact between said grinding surface and said disc blade peripheral edge.
10. A machine for sharpening disc blades as described in claim 1, in which: said grinder means includes grinder drive means, a grinder chuck drivingly interconnected with said grinder drive means and having a circular cavity and releasable clamping means and a circular grinding stone secured in said chuck cavity by said releasable clamping means with an exposed planar grinding surface.
11. A machine for sharpening disc blades as described in claim 10, in which: said grinder chuck releasable clamping means includes an annular face surface surrounding said cavity and disposed substantially normal to the walls of said cavity, and a beveled surface interposed between said cavity walls of said face surface and extending axially and radially inwardly, a retainer ring juxtaposed the face surface of said cavity with a beveled surface on its inner face extending axially inwardly and radially outwardly, said retainer ring havIng adjustable securing means disposed to tighten and loosen said retainer ring against said chuck face surface, and a split ring disposed about the periphery of said cavity and having an inner face disposed to engage said grinding stone and a wedge on its outer face having tapered surfaces disposed for engagement by said beveled surfaces on said chuck and retainer ring to force said split ring radially inwardly against the periphery of said grinding stone upon tightening of said retainer ring against said chuck face surface.
12. A machine for sharpening disc blades as described in claim 5, in which: said grinder means includes grinder drive means, a grinder chuck drivingly interconnected with said grinder drive means and having a circular cavity and releasable clamping means and a circular grinding stone secured in said chuck cavity by said releasable clamping means with an exposed planar grinding surface.
13. A machine for sharpening disc blades comprising: a frame; grinder means operatively associated with said frame and having a grinding surface disposable in a generally horizontal grinding plane; grinder mounting means interconnected with said frame and said grinder means and disposed to movably mount said grinder means on said frame; a mandril operatively associated with said frame and said grinder means and axially disposed in acute angular relationship with said grinding plane, said mandril having an upper end disposed adjacent said grinder means and a lower end disposed below said upper end and juxtaposed said frame, said mandril having a disc blade mounting means disposed to mount a disc blade on the upper end thereof; mandril mounting means interconnected with said frame and said mandril and having a pivotal mounting adjacent the lower end of said mandril and disposed to permit arcuate movement of the upper end of said mandril to change the angular relationship between said mandril and said grinding surface, and said pivotal mounting being axially movable with respect to said mandril to change the radius of said arcuate movement; and a liquid containing tank operatively associated with said frame, mandril and grinding surface, and disposed about the upper end of said mandril for submersion of substantially all of a disc blade mounted on said mandril.
14. A machine for sharpening disc blades as described in claim 13, in which: said grinder means includes a drive motor having a drive shaft interconnected therewith, and a grinding wheel mounted on said shaft and having a grinding stone and a chuck disposed to releasably mount said grinding stone; and said grinder mounting means includes feed control means having a hydraulic ram interposed between said grinder means and said frame and interconnected with variable valve means disposed to regulate the speed of travel of said ram.
15. A machine for sharpening disc blades as described in claim 13, in which: said mandril includes a housing and a hollow drive shaft rotatably mounted in said housing, and said disc blade mounting means includes a disc blade mounting plate affixed to the upper end of said drive shaft inside said tank, a lock shaft disposed in the bore of said hollow drive shaft, lock shaft drive means interconnected with said mandril housing and said lock shaft and actuatable to axially reciprocate said lock shaft from an extended position with the upper end of said lock shaft projecting upwardly beyond said disc blade mounting plate to a retracted position with the upper end of said lock shaft substantially co-extensive with said disc blade mounting plate, and a clamping plate releasably engagable with the upper end of said lock shaft when said lock shaft is in its extended position and disposed to engage a disc blade about its center opening and clamp said disc blade to said disc blade mounting plate when said lock shaft is reciprocated to its retracted position.
16. A machine for sharpening disc blades as described in claim 13 iN which: said pivotal mounting of said mandril mounting means is pivotal for arcuate movement of said distal end of said mandril with respect to said proximal end, and being releasably secured to said mandril for axial adjustment with respect thereto to vary the distance between said pivotal mounting and said mandril distal end, and being adjustably mounted to said frame for movement of said point of mounting toward and away from said grinder means.
17. A machine for sharpening disc blades as described in claim 13 in which: said liquid containing tank includes a liquid seal interconnected between said wall and said mandril, liquid supply means interconnected with said liquid tank and disposed to supply liquid to said liquid tank to a level sufficient to submerge substantially all of said disc blade, level control means operatively associated with said liquid tank and said liquid supply means and disposed to regulate the level of liquid in said liquid tank, and an auxiliary liquid conduit operatively associated with said liquid supply means and said liquid tank and disposed to supply a stream of liquid to the point of contact between said grinding surface and said disc blade peripheral edge.
18. A machine for sharpening disc blades as described in claim 13, in which: said grinder mounting means includes a grinder means mounting arm interconnected with said frame and pivotally movable with respect thereto to move said grinding surface from a grinding position juxtaposed the peripheral edge of a disc blade mounted on said mandril to a shut down position with said grinding surface removed from juxtaposition with said disc blade peripheral edge, a grinder means mounting plate movably mounted on said grinder means mounting arm for adjustment of the proximity of said grinding surface to said disc blade peripheral edge, and feed control means operatively associated with said grinder means mounting arm and said frame and disposed to control the rate of pivotal movement of said arm with respect to said frame when said grinding surface is juxtaposed said disc blade peripheral edge; and said mandril mounting means includes said pivotal mounting being pivotal for arcuate movement of said distal end of said mandril with respect to said proximal end, and being releasably secured to said mandril for axial adjustment with respect thereto to vary the distance between said pivotal mounting and said mandril distal end, and being adjustably mounted to said frame for movement of said point of mounting toward and away from said grinder means.
19. A machine for sharpening disc blades as described in claim 13, in which: said mandril mounting means includes a trunnioned collar releasably clamped to said mandril housing adjacent said proximal end and axially movable on said housing for adjustment of said point of clamping, trunnion bearings on the trunnions of said collar, bearing housings operatively associated with said trunnion bearings and releasably attachable to said frame, elongated slots in said frame disposed to receive said trunnions and permit movement of said trunnions in said slots upon release of said attachment of said bearing housings, all operatively associated to pivotally mount the proximal end of said mandril to said frame; and said mandril mounting means further includes arc positioning means operatively associated with the distal end of said mandril including a mandril slot operatively associated with the distal end of said mandril including a mandril slot operatively associated with said mandril housing and disposed substantially parallel to the axis of said mandril, a slot operatively associated with said frame and disposed substantially parallel to an arcuate path described by the distal end of said mandril upon pivotal movement about said point of pivot mounting of said mandril, and lock bolt means disposed in said mandril slot and frame slot and releasably lockable to secure said distal end of said mandril to said frame at a predetermined posiTion along said arcuate path.
20. A machine for sharpening disc blades as described in claim 15, in which: said mandril mounting means includes a trunnioned collar releasably clamped to said mandril housing adjacent said proximal end and axially movable on said housing for adjustment of said point of clamping, trunnion bearings on the trunnions of said collar, bearing housings operatively associated with said trunnion bearings and releasably attached to said frame, elongated slots in said frame disposed to receive said trunnions and permit movement of said trunnions in said slots upon release of said attachment of said bearing housings, all operatively associated to pivotally mount the proximal end of said mandril to said frame; and said mandril mounting means further includes arc positioning means operatively associated with the distal end of said mandril including a mandril slot operatively associated with said mandril housing and disposed substantially parallel to the axis of said mandril, a frame slot operatively associated with said frame and disposed substantially parallel to an arcuate path described by the distal end of said mandril upon pivotal movement about said point of pivot mounting of said mandril, and lock bolt means disposed in said mandril slot and frame slot and releasably lockable to secure said distal end of said mandril to said frame at a predetermined position along said arcuate path.
US212482A 1971-12-27 1971-12-27 Machine for sharpening disc blades Expired - Lifetime US3896591A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US212482A US3896591A (en) 1971-12-27 1971-12-27 Machine for sharpening disc blades

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US212482A US3896591A (en) 1971-12-27 1971-12-27 Machine for sharpening disc blades

Publications (1)

Publication Number Publication Date
US3896591A true US3896591A (en) 1975-07-29

Family

ID=22791206

Family Applications (1)

Application Number Title Priority Date Filing Date
US212482A Expired - Lifetime US3896591A (en) 1971-12-27 1971-12-27 Machine for sharpening disc blades

Country Status (1)

Country Link
US (1) US3896591A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4397658A (en) * 1979-10-04 1983-08-09 Sunnen Products Company Feed control means for honing and like machines
US4672776A (en) * 1983-10-11 1987-06-16 Mccullough Timothy J Circular blade sharpening device
FR2712222A1 (en) * 1993-11-10 1995-05-19 Pillet Andre Multi-purpose blade sharpener, esp. for butchery tools
US6224468B1 (en) * 1999-07-15 2001-05-01 Paper Converting Machine Company Apparatus and method for sharpening a disc blade
US20080248732A1 (en) * 2007-04-03 2008-10-09 Eric Warrenburg Disc blade sharpener
US20100216374A1 (en) * 2005-09-23 2010-08-26 General Electric Company Mitigation of stress corrosion and fatigue by surface conditioning
CN102672562A (en) * 2012-05-29 2012-09-19 苏州市乾丰造纸机械制造有限公司 Circular blade grinding machine
CN105904292A (en) * 2016-07-01 2016-08-31 安徽机电职业技术学院 Turntable type full-automatic blade grinding machine
CN107855839A (en) * 2017-11-24 2018-03-30 马鞍山市利成刀片制造厂 A kind of circular arc blade lapping device
CN109719584A (en) * 2018-12-28 2019-05-07 湖南锐阳电子科技有限公司 A kind of adjustable-angle edging device for electronic product production

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US762399A (en) * 1903-08-20 1904-06-14 Charles L Goehring Glass-grinding machine.
US2127071A (en) * 1928-11-16 1938-08-16 Charles H Schmalz Apparatus for grinding
US2401486A (en) * 1943-12-06 1946-06-04 Toledo Plate & Window Glass Co Beveling machine
US2402305A (en) * 1943-11-04 1946-06-18 Sk Wellman Co Method and apparatus for grinding plane surfaces
US2450230A (en) * 1946-03-16 1948-09-28 Norton Co Grinding wheel chuck
US2528193A (en) * 1946-11-15 1950-10-31 Charles R Van Allen Automatic disk blade grinder
US2651149A (en) * 1950-05-10 1953-09-08 Crucible Steel Co America Apparatus for grinding disks
US2747339A (en) * 1954-01-18 1956-05-29 Bausch & Lomb Lens grinding machine
US2775073A (en) * 1951-12-12 1956-12-25 Borg Warner Automatic polishing machine
US2998679A (en) * 1959-09-04 1961-09-05 Mattison Machine Works Grinding machine

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US762399A (en) * 1903-08-20 1904-06-14 Charles L Goehring Glass-grinding machine.
US2127071A (en) * 1928-11-16 1938-08-16 Charles H Schmalz Apparatus for grinding
US2402305A (en) * 1943-11-04 1946-06-18 Sk Wellman Co Method and apparatus for grinding plane surfaces
US2401486A (en) * 1943-12-06 1946-06-04 Toledo Plate & Window Glass Co Beveling machine
US2450230A (en) * 1946-03-16 1948-09-28 Norton Co Grinding wheel chuck
US2528193A (en) * 1946-11-15 1950-10-31 Charles R Van Allen Automatic disk blade grinder
US2651149A (en) * 1950-05-10 1953-09-08 Crucible Steel Co America Apparatus for grinding disks
US2775073A (en) * 1951-12-12 1956-12-25 Borg Warner Automatic polishing machine
US2747339A (en) * 1954-01-18 1956-05-29 Bausch & Lomb Lens grinding machine
US2998679A (en) * 1959-09-04 1961-09-05 Mattison Machine Works Grinding machine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4397658A (en) * 1979-10-04 1983-08-09 Sunnen Products Company Feed control means for honing and like machines
US4672776A (en) * 1983-10-11 1987-06-16 Mccullough Timothy J Circular blade sharpening device
FR2712222A1 (en) * 1993-11-10 1995-05-19 Pillet Andre Multi-purpose blade sharpener, esp. for butchery tools
US6224468B1 (en) * 1999-07-15 2001-05-01 Paper Converting Machine Company Apparatus and method for sharpening a disc blade
US20100216374A1 (en) * 2005-09-23 2010-08-26 General Electric Company Mitigation of stress corrosion and fatigue by surface conditioning
US20080248732A1 (en) * 2007-04-03 2008-10-09 Eric Warrenburg Disc blade sharpener
CN102672562A (en) * 2012-05-29 2012-09-19 苏州市乾丰造纸机械制造有限公司 Circular blade grinding machine
CN105904292A (en) * 2016-07-01 2016-08-31 安徽机电职业技术学院 Turntable type full-automatic blade grinding machine
CN105904292B (en) * 2016-07-01 2023-10-27 安徽机电职业技术学院 Rotary disc type full-automatic blade grinding machine
CN107855839A (en) * 2017-11-24 2018-03-30 马鞍山市利成刀片制造厂 A kind of circular arc blade lapping device
CN109719584A (en) * 2018-12-28 2019-05-07 湖南锐阳电子科技有限公司 A kind of adjustable-angle edging device for electronic product production

Similar Documents

Publication Publication Date Title
US3896591A (en) Machine for sharpening disc blades
US2279798A (en) Lawn mower sharpening apparatus
US2244586A (en) Grinder
DE3016654A1 (en) GRINDING MACHINE FOR FINISHING FLAT SURFACES
US5062322A (en) Universal lawn mower blade sharpening machine
KR102106157B1 (en) Blade grinder with easy to adjust grinding angle
US3224146A (en) Apparatus for grinding drills
EP1056567B1 (en) Rotary mower blade grinding
US2127071A (en) Apparatus for grinding
US2069097A (en) Knife grinder
US1799109A (en) Grinding machine
US1973511A (en) Method of grinding
US4373302A (en) Sharpening apparatus for circular blades
US1980491A (en) Terrazzo grinding apparatus
JPS5820753B2 (en) Grinding wheel truing and dressing equipment
DE842903C (en) Twist drill and countersink tip grinding machine for a conical surface grinding
US2364300A (en) Hydraulic control and ejector for grinders
US1013760A (en) Disk grinder.
DE2118895A1 (en) Grinding machine with coolant supply
US2557672A (en) Masonry saw
DE912057C (en) Method and device for successive sharpening and fine grinding or lapping of turning tools or other cutting tools
US3280513A (en) Squeegee sharpener
US3029563A (en) Guard for grinding wheel
US2651149A (en) Apparatus for grinding disks
DE1814799A1 (en) Machine for processing knives, in particular cutter and carving knives