US2707855A - Multiple utility grinder - Google Patents

Description

May 10, 1955 J. J. MILLER MULTIPLE UTILITY GRINDER 3 Sheets-Sheet 1 Filed April 17, 1953 May 10, 1955 J. J. MILLER 2,707,855

MULTIPLE UTILITY GRINDER Filed April l'7, 1953 5 Sheets-Sheet 2 -BYMW J."J. MILLER MULTIPLE UTILITY GRINDER May 10, 1955 Filed April 17, 195:5

3 SheetsSheet 3 United States Patent MULTIPLE GRINDER Joseph J. Miller, San Francisco, Calif.

Application April 17, 1953, Serial No. 349,530

1'0'Claims. (Cl. 51-166) scommon .operatingmeans for all .of the grinding-wheels with control meansoperative to applypower only :to the grindingtwheel disposed ,at the; grinding station, wvhile all ,of rtheother grinding :wheels remain inactive.

It is still further proposed to provide an individual ,guard for each g-grinding wheel, each ,guard having ,a discharge conduit :for flying; particles of dust =adaptednto :line up .with: ,a :common discharge ,when ,the guard 1 is disposed .aLthe grinding station.

Another .object ;of the present inventionis to provide for a variable,speedtransmission between a .motorandthe ,gr'inding wheels .tocornpensatefor loss of surface speed due :to the .wearing ,down of r the; grinding wheels.

A still further object of the invention is to provide for .a mounting meansfor'the turret -,on one ,sideof a supporting pedestal whichmay be readilyduplicated ontheother ,side of the pedestal for doubling the capacity sof "the machine.

,Andfinally it is proposed to provideza. machine :of the .character described that is relativelysimple .in construc- -tion, .easy .to .adjust and operate, economic :in operation, .andinwhich-all the partstand particularly the wheelatthe operating station are readily accessible,-resulting insaving inztirne-and labor.

I ,Furtherobjects .and advantages ofmy vinventionpW-ill appear as the specification progresses, ,and the :new and useful features of my MultipleUtility Grinder will .be .fully defined in the-rclaims attached. hereto.

The preferred form of my invention .is illustrated .in

the-accompanyingdrawings, forming-part of this-tapplica' i .tion, ;in which:

Figure lgshows-taniend viewof my Multiple Grinder; Figure 2, a side viewof-the same, with ,parts :shown in section;

:Figure 3, an enlarged detail section taken along wline .3-.3 of Figure 2;and

Figure.4, a section taken along line 4-4 ,of.-Figure ,3. While [I have shown only the preferred form'ofe'the invention, it 'shouldbe understod that'various changesor modifications maybe madewithin the scope of .the iclaims attached hereto without departing from the SPilitgOf the invention.

:Referring to the drawings in detail, my Multiple Grinder comprises. in its principal .features :a pedestal .-1

terminating, at its upper end, in a transverse housing ;-2,.a a;

horizontal shaft 3-revo1vable in thehousingand having a large ,gear wheel .4. fixed to theouterend.thereof acaln ,SfiXCdIO the ,outer ,end. of .the-housinganearthe-gear wheeh a drum or turret.;6 revolvable .or :tur-nablesonthe housing and .provided with anannular .seriesofstuhsshafts 252';

7 having grinding wheels 8 secured thereon outside the tdrum, a -roller,-9 on;eachzstub .shaft cooperating with the cam in establishing driving relation between the gear Wheel, and the stubshaft disposed at the grindingstation, .a 11110101 11 vertically adjustable in the pedestal and .a driving-connection including abelt 12between-the motor ,and the main shaft 3 designed to change the speed ratio in response to vertical adjustments of-the motor.

-'=1"he;pedesta1 1 may be of anysuitableform.and height andis hollow to accommodate various drive elements :therein. The-housing 2 lies transversely over the: pedestal tandhas reduced cylindrical extensions 13 projecting .in opposite directions, which makes it possible .to support two complete turret arrangements thereon. Only one (has been shown asbeing suflicient to-explain the,present invention.

The shaft 3 is revolvable in the housing in bearings 14 sandhas'the gear wheel 4secured upon the outer endthereof, the gear wheel beingin the form of a *disc having .an linwardly'off-set section to bring the gear .teeth ,in conveniently .close relation to the cam 5.

"The latter has-a generally'circular cam face of slightly longer diameter thanthatofthegear'wheel :and is fixed upon the end of the housing extension.13, :as at 15. At ltherqperating or grinding station, which is .locatedatthe horizontal central plane :of the turret, the surface of the .camtiscut.back, ..and,at this location the cam ,has ,asfitting lfipsecured "thereto :Which provides ,a short .cam face v17 see Figure A.) concentric with, .but drawn to a slightly smallerdiameter thanthe main cam surface, with suitable ggraded approachesJS mergingjntothe main camface.

=The fittingrldalso carries an outercam .19 spacedfrorn :the cam 17 andconcentric therewith-so .asto form a track 520 withthesamethe outer :cam'merging into the inner iacerof thedrumo through approaches 21 gradedtorun I parallelto the .approaches 18.

The drum 6 is revolvable on the extension 13 of the :housing 2, through a bearing v22, and comprises a hub 23, zanend -member,24 and a cylindrical wall 25 extending over thecam .5 and the gear wheel 4 and beyond .the :same andbeing made --of an inner diameter in excess of therouter diameter of the cam, so as' tovform a track26 therewith.

.Fhe drum has .the annular series of stub shafts -7 mountedtherein, with the rollers9 on theshafts arranged ttO ridein-the track 26 andthe track 20 communicating therewith. The-shafts are secured to the inner face of the drum by means of drag links 27 pivoted, at one end, as. at 2.7, intsmall brackets 28 projecting inwardly from the drum :inevenly spaced relation and terminating, at their free ends,.in sleeves 29 extending transverselyof the drum-andhav-ingthe-stub shafts 7 revolvably mounted therein, through bearings 30.

.The free endsof thegstub shafts 7 and the sleeves .29 extendlthrough an end plate 31 secured uponthe free end .ofthe-drum:and.are guided in slots 32, whichare made arcuate on the radii of the pivots 27 to allow of swinging movement of the drag links in the manner necessary for .t-he.operationiof the machine.

It-will be'noted that, when the -drum'is revolved or turned, it drags the stub shafts 7 along with it, .through ,the

. drag-.linksll and that the swinging movement :of ;the

,dragilinks is controlled by the rollers 9 ridingin the:tracks 26 gand,20,.respectively. As long as the rollers aredisposedinthe tracks 26, Which extends over the major portion of the cam 5, the shafts are held relatively close to the Wall of the drum. When the rollers enter the track 20, they -,are crowded inwardly, that is, toward the center of ,the drum, .and move the shafts correspondingly, as shown in Figure 4.

The-stuhshafts .carry pinions 33 arranged in opposing relation ,touthegear wheel and, as long as the -rollers .9 ride in the main track 26, the pinions are held out of engagement with the gear wheel, but when the rollers 9 pass through the short track 20, carried by the cam 5 at the grinding station, the pinions are made to enter into engagement with the gear wheel, attaining a position of full engagement at the central horizontal plane of the drum, as shown in Figure 4.

Each stub shaft 7 is automatically locked in central position at the grinding station by means of a springpressed plunger 34 cooperating with a pin 35 projecting from the end wall 24 of the drum opposite each shaft, the plunger having a head 36 with a central recess fitting the pin and a slanting approach 37 to the recess, whereby on a turning movement of the cylinder, the plunger is first pushed back by the pin bearing on the slanting approach and then snaps into place over the pin for locking the same in central position.

The engagement may be released manually by means of the handle 38 pivoted to the housing 2, as at 39 (see Figure 2) which operates the plunger through a link 40 for retracting the plunger.

The main shaft 3 carrying the gear wheel 4 is driven by the motor 11 through a chain drive comprising a chain 41, a sprocket 42 on the main shaft 3 and a sprocket 43 on an intermediate shaft 44 mounted transversely in the pedestal, and through a V-belt drive including a pulley 45 on the shaft 44, a pulley 46 on the motor shaft and a V-belt trained over the two pulleys.

Since a grinding wheel works most satisfactorily at a given surface speed, and since the surface speed naturally decreases as the diameter of the wheel decreases, due to wear, it is desirable to provide a simple means for varying the R. P. M. speed to compensate for a decrease in surface. This I accomplish by making the pulley 46 of the Vari-Speed type, well-known in the market, which is built on the principle of making one of the flanges of the V-pulley movable with respect to the other and of using spring pressure for urging the movable flange toward the fixed flange. Thus the active diameter of the pulley is determined by the belt pressure operating against spring pressure.

In the present structure, the variable pulley 46 is mounted on the motor shaft, and the motor is mounted in a cage 47 slidable in the pedestal and suspended from a screw 48 operable to raise and lower the cage when rotated by means of a bevel gear drive 49 and a handle 50.

In the position shown in Figure 2, the motor is set relatively low, causing the /-belt to engage in the bottom of the pulley groove and driving the gear wheel 4 and the grinding wheel at the grinding station at relatively low speed, which would give the proper surface speed for a new grinding wheel.

If it becomes desirable to increase the speed ratio, the operator merely raises the motor by operation of the handle 50. This causes the belt to climb out of the bottom of the groove in the pulley 46, due to the spring action, and to use a larger diameter of the pulley for insuring a higher speed ratio. Thus, by gradually raising the motor, the operator is able to compensate for the gradual wear on the grinding wheel and to maintain a uniform surface speed.

Each of the grinding wheels is provided with its own guard 51, the guards being mounted upon the outer ends of the sleeves 29 and moving with the grinding wheels to the grinding station.

Each guard is cylindrical in form to surround its grinding wheel in slightly spaced relation thereto, and has an opening, as at 52, to give access to the wheel at the grinding station where a suitable tool or work rest is provided, as at 53.

Each guard is also provided with a discharge conduit 54 for dust particles, leading eenterwise to a collecting chamber 55 from which it is exhausted through a port 56 connecting with a hose 57.

The operation of my multiple utility grinder should be readily understood from the foregoing description.

Upon selecting the grinding wheel he intends to use, the operator turns the drum to bring the desired wheel opposite the grinding station. During this operation the rollers 9 ride in the tracks 26 and 20, respectively, holding all the pinions 33 except one out of engagement with the gear wheel 4, while one of them passes through the grinding station and passes through a position of engagement and out again.

The operator holds the handle 38 to prevent locking at the grinding station until the selected grinding Wheel reaches the station, when he releases the handle to automatically lock the wheel in central position.

The operator may then inspect the condition of the selected gear wheel and adjust the motor by operation of the handle 50 to insure the proper surface speed.

Next, he will press one of the buttons 58 to start the motor, and driving power will be transmitted from the motor through the V-belt drive 12., the sprocket drive 41, the shaft 3 and the gear wheel 4 to the one grinding wheel disposed at the grinding station, while all the other grinding wheels remain inactive, due to their relative positions with regard to the cam 5.

I claim:

1. In a multiple grinder, a main shaft rotatable on a horizontal axis and having a gear wheel mounted thereon, a fixed member having a co-axial annular cam adjacent the rim of the gear wheel, a drum turnable on the axis of rotation and having an inner annular cam facing the first cam to form a track therewith, a plurality of drag links pivoted to the inner wall of the drum and having stub shafts revolvable in the free ends therof, rollers on the stub shafts extending into the track, and pinions on the stub shafts facing the gear Wheel, the track being positioned with respect to the gear wheel for normally spacing the pinions therefrom, and the fixed cam having means for urging any one of the pinions into meshing engagement with the gear wheel when the said pinion passes a designated station due to the turning movement of the drum.

2. In a multiple grinder, a main shaft rotatable on a horizontal axis and having a gear wheel mounted thereon, a fixed member having a co-axial annular cam adjacent the rim of the gear wheel, a drum turnable on the axis of rotation and having an inner annular earn facing the first cam to form a track therewith, a plurality of drag links pivoted to the inner wall of the drum and having stub shafts revolvable in the free ends thereof, rollers on the stub shafts extending into the track, and pinions on the stub shafts facing the gear wheel, the track being positioned with respect to the gear wheel for normally spacing the pinions therefrom, and the fixed cam having means for urging any one of the pinions into meshing engagement with the gear wheel when the said pinion passes a designated station due to a turning movement of the drum, and the drum having means for automatically locking the same when the said pinion has reached a position of full engagement with the gear wheel.

3. In a multiple utility grinder, a shaft rotatable on a horizontal axis and having a gear wheel mounted thereon, a drum turnable on the axis of rotation to encircle the gear wheel, a plurality of stub shafts carried by the drum outside the gear wheel so as to be movable with the drum and with respect thereto, the stub shafts having pinions facing the gear wheel, and cam means operable on the stub shafts for normally keeping the pinions out of engagement with the gear wheel, the cam means including means for urging any one of the pinions into engagement with the gear wheel when the stub shaft carrying the pinion passes a designated station due to the turning movement of the drum.

4. In a multiple utility grinder, a shaft rotatable on a horizontal axis and having a gear wheel mounted thereon, a drum turnable on the axis of rotation to encircle the gear wheel, a plurality of stub shafts carried by the drum outside the gear wheel so as to be movable with the drum and with respect thereto, the stub shafts having pinions facing the gear wheel, and cam means operable on the stub shafts for normally keeping the pinions out of engagement with the gear wheel, the cam means including means for urging any one of the pinions into engagement with the gear wheel when the stub shaft carrying the pinion passes through a designated station due to the turning movement of the drum, and the drum having means cooperating therewith for locking the same when the pinion has reached a position of full engagement with the gear wheel.

5. In a multiple grinder, a drum mounted for turning movement on a horizontal axis, a gear wheel revolvable Within the drum, a drag link pivoted to the inner face of the drum and having a shaft revolvable in the free end thereof, a pinion on said shaft opposite the gear wheel, and a cam mounted within the drum and active on the shaft for normally holding the pinion out of engagement with the gear wheel.

6. In a multiple grinder, a drum mounted for turning movement on a horizontal axis, a gear wheel revolvable within the drum, a drag link pivoted to the inner face of the drum and having a shaft revolvable in the free end thereof, a pinion on said shaft opposite the gear wheel, and a cam mounted within the drum and active on the shaft for normally holding the pinion out of engagement with the gear wheel, the cam having means for urging the pinion into engagement with the gear wheel when the shaft passes through a designated station on a turning movement of the drum.

7. In a machine of the character described, a cam having a major cylindrical portion drawn to the same diameter and a minor cylindrical portion of less diameter, with graded approaches betwen the two portions, the minor portion having a concentric cam face opposing the same to form a track therewith, with similarly graded approaches leading to the latter cam face, and a member turnable on the cam having means for dragging a roller over the cam and through the track, the roller having a shaft revolvable therein with a pinion on the shaft, and a gear wheel revolvable concentric with the cam and in the plane of the pinion, with the pinion clearing the gear wheel while the roller passes over the major portion of the cam and engaging therewith when the roller passes through the track.

8. In a multiple grinder, a member turnable about a central axis, an annular series of shafts revolvable in said member and having grinding wheels thereon, a rotary gear wheel mounted inside the series of shafts,

Cir

pinions on the shafts in coplanar relation with the gear wheel and normally spaced therefrom, and means responsive to a turning movement of the said member for meshing any one of the pinions with the gear wheel as the said pinion passes through a designated station, the latter means comprising a fixed cam mounted adjacent the gear wheel and rollers on the shafts riding on the cam, and the cam having a major section dimensioned to space the pinions with respect to the gear wheel and a minor track section crowding a roller passing therethrough inwardly to force its companion pinion into engagement with the gear wheel.

9. In a multiple grinder, a drum mounted for turning movement on a horizontal axis, a gear wheel revolvable within the drum and having a continuous set of gear teeth thereon, an annular series of spaced pinions carried by the drum coplanar with the gear wheel and normally disconnected therefrom, and means for establishing continuous driving gear connection between any one of the pinions and the gear wheel when said pinion passes through a designated station on a turning movement of the drum.

10. In a multiple grinder, a drum mounted for turning movement on a horizontal axis, a gear wheel revolvable within the drum and having a continuous set of gear teeth thereon, an annular series of spaced pinions carried by the drum coplanar with the gear wheel and normally disconnected therefrom and means for establishing continuous driving gear connection between any one of the pinions and the gear wheel when said pinion passes through a designated station on a turning movement of the drum, the pinions having grinding wheels mounted co-axially therewith.

References Cited in the file of this patent UNITED STATES PATENTS 1,011,461 Manning et a1. Dec. 12, 1911 1,162,233 Goddu Nov. 30, 1915 1,628,939 Wells May 17, 1927 1,949,975 Reeves Mar. 6, 1934 1,990,684 Wright Feb. 12, 1935 2,003,495 Ritz June 4, 1935 2,092,469 Oslund Sept. 7, 1937 2,437,850 Dennis Mar. 16, 1948 FOREIGN PATENTS 468,726 France July 13, 1914

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