US1537217A - Cylinder-grinding machine - Google Patents

Description

May 12, 1925. 1,537,217

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UNITED STATES PATENT or icE.

JAMES BALLOU AND GEORGE W. BALLOU, OF LITTLE ROCK, ARKANSAS.

\ CYLINDER-GRINDING MACHINE.

Application filed March 12, 192.3. Serial No. 624,622.

To all whom'z'zf may concern:

Be it known that we, JAMES BALLoU and inonon \V. BALLoU, citizensof the United States, residing at Little Rock, in the county of Pulaski and State of Arkansas, have invented certain new and useful Improvements in Cylinder-Grinding Machines; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appcrtains to make and use the same.

Our invention relates to machines for grinding the cylinder of internal combustion engines, the machine being of the type which may be secured upon the cylinder block of an automobile or similar motor when the head and pistons are removed, the machine being provided with a vertical driven shaft carrying a grinding wheel and mounted for vertical movement and for travel on a circular path about the vertical axis of the cylinder being ground.

A base frame is provided to be supported by and rigidly secured upon the cylinder block, and a vertical guideway rises rigid- 1y from an adjustable slide on said base frame and is provided with] a vertically movable carriage by which the grindingmeans are carried, and a further object is to provide an operating motor for said grinding means, mounted on a novel support extending from the side of the carriage opposite the grinding means, so that the weight of said grinding means and motor will be counterbalanced at opposite sides of the carriage.

Another object of the invention, is to provide a novel driving means for the grinding mechanism and its feed means.

Yet another object is to provide a belt driven by the motor for rotating the grinding shaft at a high speed, and a unique arrangement of parts for holding said belt tight at all times, while permitting the necessary yielding thereof, as the shaft travels along a circular path.

Another object is to adj ustably mount the above named vertical guideway, so that the grinding shaft may be located with extreme accuracy, with regard to the cylinder being ground, said adjusting means also permitting movement of theentire guideway and parts carried thereby and turning thereof about a vertical axis, so that the different cylinders may be successively ground without ad usting the base frame on the cylin der block after it has once been secured in place thereon.

WVith the foregoing in view, the invention resides in the novel subject matter herein-' after described and claimed, the description belng supplemented by the accompanying drawings. Figural is a side elevation of a grinding machine constructed in accordance with our invention.

Figure 2 is a side elevation partly in section looking at the opposite side from Fig. 1.

F gure 3 is atop plan View.

Figure 4 is substantially a central vertical longitudinal sectional view, parts however being in elevation.

F1gures 5, 6 and 7 are horizontal sectional views on the lines 5-5, 66 and 77 of Fig. 4.

Figure 8 is a vertical transverse section on line 8-8 of Fig. 1.

In the drawings above briefly described, the numeral 1 designates a horizontal base frame having parallel side bars 2, said frame being adapted to rest flat upon and be suitably secured to the cylinder block of an internal combustion engine, after the versely of the base frame 1 and We have shown the horizontal base plate 7 of an upright guideway 8, clamped upon the carriage 5 by a vertical bolt 9. .lVhen loosened. slightly, this bolt permits pivotal adjustment of the guideway 8 or turning thereof a half revolution in addition to the longitudinal and transverse adjustments afforded by the carriages 3 and 5, respectively.

The iideway 8 is preferably of arched form and the plate 7 is preferably integral with and rigidly connects the lower ends of the arch legs 10. In the present showing, these legs are formed with parallel undercut ribs 11, with which a suitable vertical carriage 12 is slidably engaged. In the present showing, a vertical feed screw 13 passes rotatably through a bearing 14 secured to the crown 15 of the arched guideay 8 and is held against vertical movement in said bearing, said screw being threaded through a nut 16 which is swiveled in. an appropriate bracket 17 suitably secured to the carriage-3. Means yet to be described, are provided for driving the nut 16 in either direction and hence it will be seen that the carriage 12 may be vertically moved along the guideway 8 as occasion may demand.

The upper end of screw 13 is preferably provided with a suitable handle 18 for making manual adjustments of the carriage 12 and for holding said screw against rotation when movement of the nut 16 is relied upon to vertically feed said carriage, we have secured a toothed wheel 19 upon the upper end of the screw and have provided a springpressed latch pin 20 for engagement with said wheel. This pin is preferably mounted in a horizontal bearing or guide 21 formed integrally with the bearing 14 and by withdrawing the pin from engagement with the toothed wheel 19 and turning it a fraction of a revolution, it will be held against reengagement with said wheel until it is again turned to the proper extent.

' nte ral With or otherwise joined to the vertical carriage 12 is a vertically disposed accurately bored bearing 25 in which a vertical, cylindrical carrier 26 is rotatably 7 mounted, and the ends of said hearing are preferably split vertically and provided with bolts or other contracting means 27, whereby any slight wear may be taken up and the carrier 26 prevented from having any loose motion. In the present showing,

the lower end of the carrier 26 is formed with an external shoulder 28 abutting the lower end of the bearing 25, and the upper end of said carrier extends above said bearing, said upper end being provided with a worm gear 29 which is keyed thereon and is held in place by a suitable ring 30 threaded upon the carrier. This Wormgear 29 is instrumental in rotating the carrier at a relatively slow speed as will be hereinafter described.

A vertical grinding shaft 31, having a grinding wheel 32 on its lower end is carried by the carrier 26 and is so mounted that it may be moved to different eccentric positions with respect to said carrier. In the preferred form of construction, the shaft 31 rotates within a vertical sleeve 34 which at 35, is threaded into a vertically elongated eccentric 36, said eccentric being rotatably received 'in a vertical bore 37 with which the carrier 26 is formed.

In the preferred form of construction,

the lower end of the eccentric 36 carries a Worm gear'37 received within the lower end of the carrier 26, said carrier being pro- I according to the size of the cylinder being ground.

The eccentric 36 may be held against downward movement from the carrier 26 in any preferred manner. We prefer however, to extend said eccentric above the carrier and to thread an appropriate retaining ring 40 thereon. A grooved pulley 41 011 the upper end of the shaft 31 holds the latter against downward movement and a collar 42 which is interposed between the grinding wheel 32 and the lower end of the sleeve 34, prevents upward movement of said shaft, it being understood that by stating that we hold this shaft against downward and upward movement, we refer to movements with respect to the carrier 26 and not with respect to the base frame 1.

Attention is directed to the fact that the bearing 25 and all parts supported thereby are at one side of the vertical carriage 12. The Weight of these parts however is more or less counterbalanced by the weight of an electric motor 43 which is horizontally mounted upon a horizontal motor supporting plate 44 extending from the opposite side of said carriage 12, the support 44 being preferably provided with an upstanding suitably braced flange 45 secured by cap screws or the like 46 to said carriage. The shaft of the motor 43 is provided with a grooved pulley 47 which drives a round belt 48, the latter being engaged with the pulley 41 for rotating the shaft 31. This belt is trained over a pair of guide pulleys 49 above the pulley 47, said pulleys 49 being carried by a slide 50 received within a suitable horizontal guide 51 carried by the motor 43, said slide being forced outwardly by a compression sprin 52 within the guide 51. It thus follows t at the belt 48 is held at the proper degree of tightness for properly driving the shaft 31, yetthis belt may yield to permit said shaft to travel on its circular path.

A suitable end frame 53 rises from the outer end of the motor support 44 and carries a bearing 54 which co-operates with a bearing bracket 55 on the carriage 12, in rotatably supporting a horizontal shaft 56 having a worm 57 meshing with the worm gear 29 for rotating the latter and the carrier 26. The shaft 56 is driven by a belt 58 and suitable pulleys from the shaft of the motor43.

case.

The end frame 53 is provided with another bearing 59 which co-operates with a portion of the bracket 17 in upporting a second horizontal shaft 60, tnis shaft being provided with a worm 61 meshing with a worm gear 62 with which the nut 16 is provided. Means are employed for rotating the sliaft 60 in either direction to cause the nut 16 and the carriage 12 to move upwardly or downwardly as occasion may require. 1n the present showing, the shaft 60 is provided with two loose pulleys 63 and 64, either of which may be connected with said shaft by a manually operable clutch member 65, one of said pulleys being driven in the-same direction as the shaft 56, by means of an ordinary belt 66 engaged therewith, while the other pulley is oppositely driven by a crossed belt 67, the two belts 66 and 67 being engaged with suitable pulleys 68 driven by the shaft 56.

By providing a machine of the character disclosed, cylinder grinding'operations may be easily performed without tearing down the entire motor. The base frame 1 may be clamped upon the cylinder block after removing the cylinder head and the pistons, without the necessity of hoisting the motor from the chassis frame and without disconnecting the cylinder block from the crank Then, by properly adjusting the several parts, the grinding wheel 32 may be lowered into one of the cylinders and operated therein to truly grind the cylinder wall to the desired diameter. lVhen one cylinder has been completely ground, the machine may be adjusted so that the wheel 32 may operate upon the next cylinder. It will thus be seen that the entire set of cylinders may be ground rapidly and easily.

It may here be further explained that when grinding the cylinders in one-half of an engine block, the grinding shaft 31 is positioned between the guideway 8 and one end of the base frame 1, the carriage 3 being adjusted along said base frame as required. In order to reach the cylinders toward the other end of the motor block, the entire grinding mechanism is raised until the wheel 32 will clear the frame 1. The bolt 9 is then loosened and the guideway 8 and all parts carried thereby, are turned one-half revolution. Then, by adjusting the slide 3, these parts are moved over the end of the cylinder block in which the cylinders have already been ground. Thus, the grinding shaft 31 may be lowered between the guideway 8 and the opposite end of the frame 1, to grind the remaining cylinders. By having a machine which can be operated in this manner, all of the cylinders may be ground withontonce moving or adjusting the base frame on the engine block after it is initially a secured in place.

Attention may be directed to the fact that during the grinding operation, in order to prevent particles of metal and abrasive material from falling into the crank case and later interfering with proper lubrication, any suitable provision may be made.

As excellent results have been obtained from the details disclosed, they may well be followed. However, within the scope of the invention as claimed, numerous changes may be made.

We claim:

1. A cylinder grinding machine compris-' ing a vertical guideway having two laterally spaced vertical tracks, a carriage slidably engaged with said tracks and spanning the space between them, cylinder grinding means carried by said carriage at one side of said tracks, a horizontal plate secured at one end to the side of the carriage remote from the grinding means, said plate passing between said vertical tracks and projecting from the side thereof remote from said grinding means, an electric motor mounted on said plate, and driving connections between said motor and said grinding means.

2. A cylinder grinding machine comprising a vertical guideway having two laterally spaced vertical tracks, a vertical carriage plate slidably engaged with said tracks and spanning the space between them, said plate having a vertical hearing at one side of the tracks and a rotatable grinding shaft carrier in said bearing, a'horizontal plate between said tracks and rigidly secured at one end to the lower end of said carriage plate, sai

alined bearings, driving connections between one shaft and the aforesaid grinding shaft carrier, feeding means for the carriage plate driven by the other shaft, an electric motor mounted on the above-named horizontal plate substantially under said shafts, driving connections between said motor and shafts, a grinding shaft carried by the afored horizontal plate projecting from the side of said carrier, and driving connections between said motor and said grinding shaft.

8. A cylinder grinding machine comprising a vertical guideway having two laterally spaced vertical tracks, a vertical carriage plate slidably engaged with said tracks and spanning the space between them, said plate having a vertical hearing at one side of .the tracks and a rotatable grinding shaft carrier in said bearing, a-horizontal plate between said tracks and rigidl secured at one end to the lower end of sa carriage plate, said horizontal plate pro ect1ng from the side of said tracks remote from the carriageplate, a bracket between said tracks secured to the upper end of said carnage plate and having a horizontal bearing, a second bracket secured adjacent the upper end of the aforesaid vertical bearingand having a horizontal bearing, an end frame rising from the outer end of said horizontal plate and having two bearings alined with the bearings of said brackets, a pair of parallel horizontal shafts rotatablymounted in said alined bearings, driving connections between one shaft and the aforesaid grinding shaft carrier, feeding means for the carriage plate driven by the other shaft, an electric motor mounted on the above-named horizontal plate substantially under said shafts, driving connections between said motor and shafts, a grinding shaft carried by the aforesaid carrier and having a horizontal pulley at its upper end, a vertical pulley on the motor shaft, a pair of co-axia vertical pulleys above said motor pulley and at right angles to the axis thereof, a horizontal slide carrying said co-axial pulleys and spring pressed toward the aforesaid end frame, a guide for said slide disposed over and secured to said motor, and a driving belt trained around all of the aforesaid pulleys.

4. A machine of the class described comprising a support, a vertical shaft mounted thereon and having a pulley on its upper end, means for bodily moving said, shaft about a vertical axis, a horizontal motor on said support whose shaft is provided with a pulley, a horizontal guide over and secured to the motor casing, a slide engaged with said guide and spring-pressed away from said vertical shaft, said slide having a pair of co-axial pulleys disposed on a horizontal axis above the motor shaft pulley, and a belt passing around the pulley of said vertical shaft and having horizontal reaches extending to said co-axial pulleys,

said belt having vertical reaches from said co-axial pulleys to the motor pulley.

5. A cylinder grindingi'nachine compris-.

ing a horizontally elongated base frame adapted to be secured on an engine block, a slide adjustable along said frame, a support on said slide carrying vertically adjustable grinding means including a grinding shaft passing through the base frame between the support and one end of the frame, a vertical pivot connecting said support with said slide' and permitting turnin of said support to position the grinding shaft toward the other end of the frame, and means for normally holding said support against turning on its pivot.

6. A machine of the class described comprising a base, a carriage longitudinall adjustable thereon, a second carria e a justable transversely of the first'name carriage, an arched guidewa having parallel legs and a horizontal p ate rigidly connecting their lower ends, means pivotally clamping said horizontal plate to said second carriage on a vertical axis, a third carriage vertically movable along said parallel legs of said guideway, a feed screw suspended from the crown of said guideway and releasable means for holding it against rotation, a nut swiveled on said third carriage and engaged with said screw, a horizontal motor support extending from said third carriage between the legs of said guideway and a horizontal motor mounted on said support, reversible means for driving said nut from said motor, a vertically elongated bearing carried by the side of said third carriage opposite said motor support, a vertically elongated cylindrical carrier rotatably mounted in said bearing and driven by said motor, and a vertical grinding shaft carried eccentrically by said carrier and driven by said motor. 1 I

In testimony whereof we have hereunto affixed our signatures.

JAMES BALLOU. GEORGE W. BALLOU.

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