US1733091A - Grinder foe shouldeeed work - Google Patents

Description

Oct. 22, 1929. H. w. HOLMES GRINDER FOR SHOULDERED WORK Original Filed Dec. 20, 1923 4 Sheets-Sheet l INI ENTOR. 444 (fa/mp 1929- H. w. HOLMES 1,733,091

GRINDER FOR SHOULDERED won 7 Original Filed Dec. 20, 1925 4 s ets-sheet 2 /B/V INVENTOR- A TTORN E Y'.

Oct. 22, 1929. H. w. HOLMES GRINDER FOR SHOULDERED WORK o inai Filed Dec. 20, 1923 4 Sheets-Sheet MN QM an M0 an A TI'ORNE Y.

Oct. 22, 1929. w, HOLMEs 1,733,091

GRINDER FOR SHOULDERED WORK Original Filed Dec. 20, 1923 4 Sheets-Sheet 4 EN'TDR.

Maud/M441 AT RNEY.

i atentecl Oct. 22, 1929 UNITED STATES PATENT OFFICE HAEGLD \V. HOLMES, 013 DETROIT, MICHIGAN, ASSZGNOR, BY MESNE ASSIGNMENTS, TO CINCINNATI GRINDERS INCORPORATED, O1" CINCINNATI, OHIO, A CORPORATION or OHIO Application filed December 20, 1923, Serial No. 681,870. Renewed March 1, 1929.

This invention relates to grinding apparatus and more particularly to machines for provide a thoroughly practical grinding machine for accurately grinding by means of an abrading wheel, the cylindrical portion or portions of Work pieces having enlargements or shoulders at or intermediate their ends, the work pieces being turned by means of a second wheel instead of by such means as centers. Another object of this invention is to provide a machine of the above-mentioned character in which the abrading wheel and the second wheel, running in the same direction about their respective axes and the latter wheel turning much slower than the abrading wheel, are so related to each other that the weight of the work pieces, interposed between the two wheels, is supported by the slow running wheel. Another object of this invention is to provice a simple and thoroughly practical mechanism for automatically moving the abrading wheel away from and toward the lower or supporting Wheel to permit the introduction of the work onto the lower wheel and its subsequent removal therefrom after the'abrading wheel has been carried into, through, and out of grinding position, suit able means being provided for holding the work in operative relation to the lowermost or work-turning wheel when the abrading wheel is moved away therefrom and also for holding the work in operative relation to the two wheels while the abrading wheel is in grinding position. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts as will be exemplified in the structure to be hereinafter described and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which is shown one of the various possible embodi ments of my invention,

Figure 1 is an end elevation of the entire assembled grinding machine;

Figure 2 is a vertical longitudinal section, taken substantially through the axis of the upper or abrading wheel, showing the supporting and actuating mechanism for the upper or abrading wheel; 7

Figure 8 is a vertical transverse section taken along the line 33 of Figure 5;

Figure l is a vertical section of a bearing construction as seen on the line 4:,4 of Figure 5, and

Figure 5 is a plan view of the mechanism shown in Figure 2, certain parts being broken away for the sake of greater clarity.

Similar reference characters refer to simi-- lar parts throughout the several views of the drawings.

Referring now to the drawings and more particularly to Figure 1, the apparatus in-' eludes an appropriate base 1 from which rises the frame 2, the latter being extended at its upper portion toward the forward part of the apparatus (toward the right as viewed in Figure 1) for supporting rotatably, by mechanism more clearly described hereinafter, a shaft 6 connected to which in a manner more clearly described hereinafter and to rotate therewith, is a grinding wheel 21, the latter, as will be clearly seen from Figure 1 being thus rotatably supported in overhanging relation.

Suitably mounted for rotation at the lower left-hand or rear portion of the frame 2 is a counter shaft 3 provided with a pulley a which is connected by an appropriate belt with the pulley 5 mounted upon the shaft 6 for driving the grinding wheel 21, so that the grinding wheel may be suitably driven from the counter shaft 3.

At the forward or right-hand portion of the base 1, as viewed in Figure 1, there is provided an auxiliary frame portion or table 8 which adjustably supports the vertically movable ram 9, the upper portion of which rofiatably supports the shaft of a wheel 10, the latter being, as will be clear from Figures 1 and 2, positioned substantially underneath the grinding or abrading wheel 21. The wheel 10 is driven by mechanism including the transverse shaft 11, gears 12, the vertical shafts 13 and 14: (connected by the flexible coupling seen in Figure 1), appropriate gearing connecting the shaft 14; to the shaft of the lower wheel 10. Various details of construction, particularly with respect to the mounting and driving mechanism for the wheel 10, as well as details of the ClliXG of the grinding wheel, are more fully described in my co-pending application Serial No. 672,844., filed November 5, 1923, and to which application reference may be had for further details with respect thereto. The lower wheel 10 I prefer to be of abrading material to insure proper turning of the work.

The work indicated at A in Figure 1 will be seen to be interposed between the adjacent operative surfaces of the abrading or grinding wheel 21 and of the lower or work rotating wheel 10, the work A being held in proper position by a pair of guide plates 63, seen horizontally spaced from each other in Figure 1,. one of wliich (the outermost) is supported: by a horizontally adjustable carriage G hand the other of which is supported by a carriage 66 (see Figures 1 and 2). The carriage G6 is vertically movable and is carried by a bracket 65 extending upwardly from the frame or casing 2 of the machine. The carriage 66, moreover. is provided with arack bar 67 engaged by a pinion (not Sl10WI1)011 a shaft (58 supported in a suitable housing and rotatable by means of a hand wheel ('39. operation of the hand wheel (39, the shaft 68 may be rotated and the carriage 66, through the gear and rack connee tion between the shaft 68 and the carriage (36, -'aised and lowered at will. \Vith respect to these structural features, they are described in detail; in my above-mentioned co-pending applicationyto which reference may be made.

The upper end of the frame 2 consists of the parallel side portions 16 and 17 (see Figure 2) which are suitably bored out to receive the integrally connected trunnions 18 and 19, the latter being formed with inwardly tapering bores to receive the conical bearings 22 and 23 in which is rotatably supported the shaft 20 of the grinding wheel 21. The bearings 22 and 23 are split and are adjustable in thetrunnions by means of the nuts 2-l-.25 and 26-27 respectively. The trunnions 18 and 19 are bored eccentrically (as shown in Figured) for thus eccentrically receiving the bearings 22 and 23 and for thus eccentrically supporting the shaft 20 upon which the grinding wheel 21 is mounted. This eccerr trio relation of the parts will be seen to effect anelevation or depression of the shaft 20 and hence of the grinding wheel 21 as the trunnions 18 and 19 are turned in their respective bearings 16 and 17. The trunnions 18 and 19 are rigidly connected by a casing-like construction comprising the side members 28 and 29 (see Figure 5) the bottom member 30 (see Figure 8) and a removable cover member 31. An arm 32 (Figures 8 and 5) preferably integrally formed with the connecting casing construction extends rearwardly of the apparatus and carries a roller 3?) adapted to coact with a cam 3 f rigidly mounted to rotate with the shaft 43.

Shaft 43 is rotatably supported in suitable bearings provided in the side members of the frame 2 (see Figure 5) and is provided with a worm wheel 42 which meshes with the worm ll (see Figure 3 and Figure 2) in turn carried and driven by a horizontally and rearwardly extending shaft 10-. The shaft 4:0 is mounted in suitable bearings (see Figure 8) and extends through the rear wall portion of the frame 2, carrying at its outermost end a bevel gear 39. Bevel gear 39 and hence shaft 40 are driven by a eo-mating bevel gear .38 (Figures 3 and 5) which in turn is driven by a short cross-shaft 35 (Figures 5, 3 and 1) provided with a pulley 36 and connected in turn by a belt 87 tobedriven from the counter shaft 3.

Referring to Figure 3, it Will be-noted that a suitable weight 4.4 is suspended by the vertical member 46 from the horizontal arm 47 attached to the arm 32 which carries the roll .r 33 thus, the weight 41-1 acts to hold the roller against the cam 34:, to insure its pro per coaction therewith, it being noted that the cam 3% is provided with a cylindrical dwell portion 48, for a purpose hereinafter more clearly described As will be clearly seen from Figures 2, 3 and 5, shaft also carries and rotates therewith a cam 4L9,whose side face is shaped to provide alternate elevated and depressed portions with which a roller 50, carried on a stud 52 in an arm 53 engages, thus to be actuated thereby. The arm 53 is attached to the lower end of a vertically extending shaft 54. (see Figures 3 and rota'tably mounted in the bottom portion 30 of the trunnionconnecting casing construction hereinabove described. The upper end of the shaft 5%: has secured thereto a forked crank arm or yoke 55, the arcuate arms of which extend generally about the shaft 20 of the grinding wheel 21 and are provided with inwardly directed pins 56 which extend into a ring 57 loosely extending about the threaded middle portion ('30 of the grinding wheel shaft 20. Thus, oscillations of the vertical shaft 5 3i, under the control of the cam 49, cause the oscillation of the yoke and hence of the ring 57, the latter being oscillated in the general direction of the axis of the shaft 20. This oscillating movement of the ring 57 is communicated to the shaft 20 and hence to the grinding wheel 21 due to the fact that the ring 57 (see Figure 2) is held between the nuts 59, engaging the threaded middle portion 60 of the shaft 20, suitable bearing collars 58 being interposed between the ring 57 and the nuts 59. A spring 61 (see Figure 2) connected between one arm of the yoke 55 (and conveniently connected to the lowermost pin 56 of the yoke) and the left-hand inside wall portion of the trunnion-connecting construction acts in a direction to insure that the roller maintains contact with the cam face of the cam 19 and that thus the movement in an axial direction of the shaft 30 and hence of the grinding wheel 21 is dependably controlled bv the cam 19.

The shaft 20 of the grinding wheel and hence the grinding wheel itself will thus be seen to be subjected to movements in two general directions; the pulley 5 is rotatable upon the shaft 6, the latter being supported in the arm 7 (see Figures 1, 2 and 5) and the pulley 5 is connected to the shaft 20 by means of a universal coupling (not shown) which permits the pulley 5 and the shaft 20 to rotate about substantially parallel axes while permitting freely the movements above described of the grinding wheel shaft 20. These moven'ients are in a longitudinal or axial direction with respect to the shaft 20' and also in a direction transverse of the axis of the shaft 20. Certain details of the connection between the pulley 5 and the shaft 20 are more clearly shown and described in my aboi-e-mentioned co-pending application, to which reference may be had.

Considering now the operation of the apparatus, and referring to Figure 1, it might first be noted that the several parts of the apparatus are first properly adjusted to adapt the apparatus foroperation upon the work of a particular diameter. Thus, for example, the lower or work rotating wheel 10 may first be raised or lowered, according to circumstances, so that the adjacent operative surfaces of the two wheels are, when the upper or grinding wheel 21 is held in its lowermost position by the dwell portion d8 of the cam 44; (see Figure 3), spaced apart by a distance substantially equivalent to the diameter to which the work is to be reduced. In Figure 1 the grinding wheel 21 is shown in its lowermost or grinding position. The work holding plates or members 63 (see Figure 1) are also adjusted to the desired vertical position and spaced in a horizontal direction one from the other to receive the work piece A therebetween, these adjustments being achievable by the mechanisms hereinbefore described.

The apparatus is set in motion whereupon, as will now be clear from the foregoing, the rotating cam 34, acting to oscillate the trunnions 1S and 19 in which the grinding vheel shaft 20 is eccentrically supported, efiects a sequential raising and lowering of the grinding wheel while the cam 49, acting through the arm 53, shaft 5 1 and yoke (see Figure 3) effects a repeated back and forth movement of the grinding wheel shaft 20 and of the grinding wheel itself. When the grinding wheel is in raised position, due to the contact of the roller 33 of arm 32, with the innermost portions of the cam 34, the operator places a work piece A upon the lower wheel 10 and between the work holding members 63. Preferably the work piece A is inserted between the members 63 by a movement thereof in a general axial direction and so that the enlarged or shouldered portion of the work piece A (see Figure 2, where the work piece A is indicated in dotted lines) engages the side face of the lower wheel 10, it being noted that the width of the operative face of the grinding wheel 21 is at least sufficient to engage the full length of the cylindrical or round portion of the Work piece.

When the work piece A is positioned between the work holding members 63 and upon the lower wheel 10, which thus supports the weight of the work piece, the lower wheel 10 rotates it between the members 63, one of which members, during this preliminary rotating action, holds the work piece A in position on the work-turning wheel 10. As hereinabove noted, the grinding wheel 21 and the supporting wheel 10, which turns much slower than the grinding wheel 21, run in the same direction about their respective axes; they may, for example, be driven in clockwise direction as shown in Figure 1 of my above-mentioned co-pending application and hence the adjacent operative surfaces of the two wheels travel in opposite directions, the upper surface of the work rotating wheel 10 moving to the right as viewed in Figure 1 herein and the lower operative surface of the grinding wheel 21 moving toward the left as viewed in Figure 1 herein. During the above-mentioned preliminary rotating action the right-hand member 63 (as seen in Figure 1) acts to hold the work piece A against substantial bodily movement or displacement by the slow moving surface of the lower wheel 10.

As the cam 34 continues to rotate (in a counterclockwise directionas viewed in Figure 3) the trunnions 18 and 19 are swung in clockwise direction (as the trunnion 19 is viewed in Figure 1) and the grinding wheel 21 is thus brought down and into engagement with the rotating work piece A, and engages the work piece to perform the grinding operation thereon. During this grinding action of the abrading wheel 21 upon the work piece A, the left-hand work holding member 63 acts to hold the work piece A against substantial bodily displacement in a direction toward the left as viewed in Figure 1 due to the thrust of the grinding wheel 21 upon the work piece A in a-direction toward the left as viewed in Figure 1. During the grinding action of the abrading wheel 21 upon the work piece A, it being noted that the dwell portion 48 of thecam (see Figure 3) is of sucha length that the grinding wheel is held down in operative contact with the work for a sufficient length of time to reduce the diameter thereof to the desired extent, the grinding wheel is moved back and forth in a general direction lengthwise of the axis of the work piece A under the control of the cam 49 and the mechanism enacting with the latter. As soon as the cam 3i- (l igure in continuing its rotation in a counter-cloclmise direction has had its dwell portion 48 moved out of contact with the roller 33 on the arm 32, the roller 33 is permitted a substantial movement downardly as viewed. in il igiu e 3, due to the shape of the cam 3-1, and the resultant counterclockwise movement of the trunnions 18 and 19 viewed in Figure efl'eets'the movement of the grinding wheel 21 upwardly as viewed in l igi'ires 1 and 2, whereupon the work piece is removed and replaced by another. The cycle of operations above described may then be repeated.

It might at this point be noted that the axial movement of the grinding wheel 22 under the control. of the cam 4:9 achieves a number of distinct advantages and among these may be Jointed out the fact that anicely finished ground. surface may be achieved on the worl; free from circumferential scratches or grain liiarkings that might otherwise be n.'odured by the grinding wheel 21. it might also be pointed out that a distinct advantage is achieved in the above-described arrangement whereby the lower wheel 10, which insures proper turning of the work, effects a rotation of the work piece A prior to the movement of the grinding wheel 21 into grinding position with respect to the work itself, since the bringing of the grinding wheel 21 into grinding contact with the workpiece A finds the work piece in an already rotating condition it will be understood that the lower wheel 10 continues to insure the turning of the work during the grinding operation upon the work by the abrading wheel 21.

It will thus be seen that there has been provided in this invention an apparatus in which the several objects hereinbefor. set forth as well as many thoroughly practical advantages are successfully achieved. It will further be seen that the apparatus is of a thoroughly practical nature and well adapted to meet the i conditions of hard practical use.

a grinding speed, a work rotating wheel r0- means tated at a speed much slower than said grinding wheel, said wheels being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite direc tions, means for holding work of round section between said wheels, said wheels being mounted in peripheral opposition to each other, means mounting said grinding wheel adapted to permit movement thereof in a direction sothat the axis thereof moves in a lateral direction into and out of operative relation to the work rotating wheel, and means for effecting said movements of the grinding wheel substantially periodically and in suitably timed relation to permit grinding of the work piece to a predetermined size and thereafter to permit removal and replacement of the work piece;

2. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel r0- tated at a speed much slower than said grinding wheel, said wheels being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, means rotatably supporting said wheels so that the work rotatin wheel is positioned below the grinding wheel, and means for causing during the rotation of said wheels a substantially periodic relative movement between said wheels for bringing them into and out of coaeting operative relation with respect to a work piece positioned therebetween.

3-. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel rotated at a speed much slower than said grinding wheel, said wheels being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, a sleeve-like member having the shaft of one of said wheels eccentrically mounted therein, means for swinging said sleeve and adapted thereby to move the said eccentrically mounted shaft and the wheel supported by the latter in a direction toward or away from the other wheel, and means for giving said shaft and the wheel supported thereby amovement in a general direction lengthwise of the axis of said shaft, said last-mentioned means being operative throughout the movement of said shaft and wheel in a direction toward or away from the other wheel.

4. In apparatus of the character described, in combination, a grindingwheel rotatable ata grinding speed, a work rotating wheel rotated at a speed much slower than said grinding wheel, said wheels being rotated in directions so'that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, a sleeve-like member having the shaft of one of said wheels eccentrically mounted therein, means for swinging said sleeve and adapted thereby to move the said eccentrically mounted shaft and the wheel supported by the latter in a direction toward or away from the other wheel, and means for moving said movably supported wheel in a general direction lengthwise of the axis of the work piece between the said wheels.

' 5. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel rotated at a speed much slower than said grinding wheel, said wheels being rotated indirections so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, a sleeve-like member having the shaft of one of said wheels eccentrically mounted therein, means for swinging said sleeve and adapted thereby to move the said eccentrically mounted shaft and the wheel supported by the latter in a direction toward or away from the other wheel, a rotatable cam and connections between said cam and said movably mounted wheel adapted to e fect a movement of said wheel in a direction lengthwise of the axis of the work piece and operative throughout the range of movement effected by said swinging sleeve.

6. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel rotated at a speed much slower than said grinding wheel, said wheels being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holdingwork of round section between said wheels, a sleeve having the shaft of said grinding wheel eccentrically mounted therein, means for swinging said sleeve thereby to effect movement of said grinding wheel toward or away from said work rotating wheel, and means for oscillating said grinding wheel in a general direction lengthwise of the axis of the work piece, said oscillating means being operative throughout the range of movement of said grinding wheel effected by said sleeve.

7. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, avwork rotating wheel rotated at a speed much slower than said grinding wheel, said wheels being rotated in directions so that the adjacent operative s rfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, means mounting said wheels so that the work rotating wheel is positioned below the grinding wheel and adapted also to permit relative movement in a lateral and in an axial direction between said wheels, means for imparting during rotation of said wheels a substantially periodic relative movement therebetween to bring them into and out of operative relation to the work, and means for moving the grinding wheel axially during the grinding operation.

8. In apparatus of the character described, in combination, a grinding wheel rotatable a grinding speed, a work rotating wheel rotated at a speed much slower than said 'nding wheel, said wheels being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, and means for feeding the grinding wheel in a curved path into and then out of operative. relation with respect to the work rotating wheel to permit removal and replacement of the work therebetween.

9. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel rotated at aspeed much slower than said grinding wheel, said wheels being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, and means supporting the grinding wheel shaft for oscillation toward and from the work about an axis eccentric to the axis of the grinding wheel shaft.

10. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel rotated at a speed much slower than said grinding wheel, said wheels being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, a trunnion, a wheel spindle eccentrically mounted in said trunnion, one of said wheels being mounted on said spindle, and means for turning said trunnion to move the wheel supported thereby relative to the other wheel.

11. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel rotated at a speed much slower than saidgrinding wheel, said wheels being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, a trunnion, a spindle eccentrically mounted in said trunnion, said grinding wheel being mounted on said spindle, and means for turning said trunnion to move the grinding wheel into and out of operative grinding contact with the work.

12. Inapparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel rotated at a speed much slower than said grinding wheel, said whee-ls being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, means inclu ding an eccentric for mounting said grinding wheel, means for rocking said eccentric to more said grinding wheel toward and from the work, and means for moving the grinding wheel axially during the grinding operation.

13. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel rotated at a speed much slower than said grinding wheel, said wheels being r0- tated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, a cam actuated mechanism for moving said grind ing wheel substantially periodically into and out of operatiue grinding contact with the work, and a cam controlled device for reciprocating the grinding wheel while in grinding contact with the work.

14. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel rotated at a speed much slower than said grinding wheel, said wheels being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section "between said wheels, and a cam actuated mechanism for moving the grinding wheel substantially periodically into and out of operative grinding contact with the work.

15. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel rotated at speed much slower than said grinding wheel, said wheels being rotated in directions so that the adjacent operative surfaces oi said two wheels move in opposite directions, means for holding workof round section between said wheels, a trunnion, a spindle eccentrically mounted in said trunnion, said grinding wheel. being mounted upon said spindle, a cam controlled mechanism tor turning said trunnion to move the grinding wheel into and out of operative grinding contact with the work, a yoke connected with said grinding wheel spindle, and a cam actuated mechanism for reciprocating said yoke and thereby moving the grindiner whcel axially while in grinding contact with the work.

16. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel rotated at speed much slower than said grinding wheel, said wheels being rotated in directions so that the adjacent operative surfaces off said two wheels move in opposite directions, means for holding work of round section between said wheels, a trunnion, a spindle eccentrically mounted in said trunnion, said grinding wheel being mounted upon said spindle, a shaft having two cams mounted thereon, means coacting with one of said cams for turning said trunnion, and means actuated by the other cam on said shaft for moving the grinding wheel axially.

17,. In a grinding machine, in combination, a pair of wheels having substantially parallel spindles, one for each of sair wheels, said wheels being positioned one above the other, bearings supporting the spindle of the upper wheel, vertically movable means for supporting said bearings, a shaft having two cams thereon, one of said cams acting to cause the spindle oi the upper Wheel to be moved up and down, and means engaging the other cam on said shaft for causing said spindle to slide axially in its hearings.

18. In a grinding machine, in combination, a pair of wheels one positioned substantially above the other and supported upon substantially parallel spindles,ineans for drivin g said spindles, bearing means for the spindle of the upper wheel, vertically movable means for supporting said bearing means, a shaft having a cam thereon for Causing the upper spindle to move up and down, a second cam on said shaft, and means held in engagement with said. second cam by a spring and coacting with the spindle of the upper ,wheel to cause the spindle to slide axially in its bearings, said mentioned cam being shaped to cause said sliding spindle to move back and forth.

19. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed, a work rotating wheel rotated at a speed much slower than said grinding wheel, said wheels be ing rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, a sleeve having the shaft of said grinding wheel ,eccentrically mounted therein, means for swinging said sleeve thereby to effect movement of said grindi wheel toward or away from said work rotating wheel, said grinding wheel shai't being movable in a general axial direction relative to said sleeve, a rotatable cam, and connections between said cam and said grinding wheel shalt for axially moving the latter, said connections and said cam being etfective throughout the range of movement 0;?

rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between said wheels, a trunnion, a spindle eccentrically mounted therein, one of said wheels being mounted upon said spindle, a mechanism to turn said trunnion to move the wheel carried thereby toward or away from the other wheel, and mechanism for causing relative reciprocating movement between the grinding wheel and the work.

21. In apparatus of the character described, in combination, a grinding whee rotatable at a grinding speed, a work rotating wheel rotated at a speed much slower than said grinding wheel, said wheels being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions, means for holding work of round section between sait wheels, a trunnion, a spindle eccentrically mounted therein, one of said wheels being mounted upon said spindle, mechanism for turning said trunnion to move the wheel supported thereby toward or away from the other wheel, and cam actuated mechanism for reciprocating the grinding wheel in a general direction lengthwise of the axis the work.

22. In apparatus of the character described, in combination, a grinding wheel rotatable at grinding speed, a work rotating wheel positioned substantially underneath said grinding wheel and rotatable at a relatively low speed, said wheels being adapted to aresent adjacent operative surfaces moving in opposite directions, means for relatively separating said wheels to permit the insertion therebetween and substantially upon said work rotating wheel of a work piece of round section and for thereafter relatively approaching wheels into operative relation to the work piece, means for holding a work piece against displacement by the slow moving operative surface of the work rotating wheel, the latter being operative while said wheels are relatively separated to preliii inarily rotate the work piece prior to the completion of the relative approaching movement of said wheels, and means for welding the work piece against displacement by the thrust exerted thereon by the grinding vheel hen said wheels are relatively appreached.

23v In apparatus of the character described, in combination, a grinding wheel rotatable at grinding speed, a work rotating wheel positioned substantially underneath said grinding wheel and rotatable at a relatively low speed, said wheels being adapted to present adjacent operative surfaces moving in opposite directions, means for relatively separating said wheels to permit the insertion therebetween and substantially upon said work rotating wheel oi awork piece of round section and for thereafter relatively ap proaching said wheels into operative relation to the work pie e, and two substantially horizontally spaced members extending between said wheels adapted to receive there between awork piece placed substantially upon s id work rotating wheel, one oti" said members acting while said wheels are relatively separated to hold the work piece rotated by said work rotating wheel against substantial horizontal displacement by the latter, and the other of which is adapted to hold the work piece against displacement by the thrust of the grinding wheel thereon while said wheels are relatively approached.

Qt. In apparatus of the character described, in combination, a grinding wheel rotatable at grinding speed, a work rotating wheel positioned substantially underneath said grinding wheel and rotatable at a relatively low speed, said wheels being adapted to present adjacent operative surfaces moving in opposite directions, means for moving said grinding wheel in a general vertical direction away from said work rotating wheel, thereby to permit the insertion therebetween oi a work piece, and for moving said grinding wheel in a general downward direction to bring the latter into grinding contact with the work piece, and means substantially between said wheels at apted to hold an inserted work piece in position for rotation by said work rotating wheel prior to the operative contact of the grinding wheel with the work piece and for holding the work piece in operative relation to both of said wheels while said grinding wheel is in grinding contact with the work piece.

25. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed; a work rotating wheel rotated at a speed much slower than said grinding wheel; said wheels being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite directions; means for holding work of round sections between said wheels; one or" said wheels having a peripherally operative surface and having a spindle; means for controlling the distance between said peripherally operative wheel and its coacting wheel, said controlling means including means rotatably supporting said spindle, means pivotally mounting said last-mentioned means to permit the latter to swing about an axis displaced from the axis of said spindle, and means acting through an arm greater in length than the displacement between said two axes for predetermining the extent of movement of said spindle.

26. In apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed; a work rotating wheel rotated at a speed much slower than said grindtrollii men includin mea port ad spindle, means plvotally mount-- ing said last-nieutioned means to permit the latter to swing about anaxis displaced from the 2L of aid spindle, yielding ly acting means tending to swing said spindle-s1ipporting means in one direction about the axis of its pivot, and positively acting means opposing said yielding means.

527. in apparatus of the character described, in combination, a grinding wheel rotatable at a grinding speed; a work rotating wheel r0 tated at a speed much slower than said grinding wheel; said wheels being rotated in directions so that the adjacent operative surfaces of said two wheels move in opposite direc' tions; means for holding work of round section between said wheels; one of said wheels having a peripherally operative surface and having a spindle; means for controlling the distance betwee said peripherally operative wheel and its coacting wheel, said controlling means including means rotatably supporting said spindle, means pivotally mounting said last-mentioned means to permit the latter to swing about an axis displaced from the axis of said spindle, and means for predetermining the displacement of said spindie-supporting means about the axis of its pivot.

28. In apparatus of the character described, in con'lbination, a grinding wheel rotatable at a grinding speed; a work rotating wheel rotated at a speed much slower than said grinding wheel; said wheels being rotated in directions so that the adjacent operative sur faces of said two wheels move in opposite directions; means for holding work of round section between said wheels; means mounting one of said wheels for oscillation about a pivot in a direction toward. or away from the other wheel; and power-actuated means for controlling the oscillation of said wheel about said pivot.

29. In apparatus of the character described, in combination, agrinding wheel rotatable a t a grinding speed; a work rotating wheel rotated. at a speed much slower than said grinding wheel; said wheels being); rotated in directions so that the ailjacent operative surfaces of said two wheels more in opposite directions; means for holding work of round section between said wheels; means mounting one of said wheels for oscillation about a pivot in a direction toward or away from the other wheel; and means including a cam for swinging said wheel-mounting means about its pivot.

30. In grinding apparatus, in combination, a grinding wheel adapted. to be rotated at a relatively high speed, a regulating wheel positioned at a lower elevation. than said grind ing wheel and. rotatable at a relatively low speed, thereby to control the rotation of work of round section interposed therebetween, said wheeis being adapted to pro-sent adjacent operative surfaces traveling in opposite directions, means for holding work of round section between said wheels, means for relatively withdrawingsaid wheels thereby to permitt movement of a work piece into or out of operative relation to said wheels and for relatively approaching said wheels to effect a grinding operation upon the work by said grinding wheel.

HAROLD N. HOLMES.

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