US2419170A - Grinding machine steady rest - Google Patents

Description

April 1947. H. A. SlLVEN GRINDING MACHINE- STEADY REST Filed March 17, 1945 4 Sheets-Sheet; 1

r gvwmm HERBERT A. SILVEN GRINDING MACHINE- STEADY REST Filed-March 1 7, 194s 4 Sheets-Sheet 2 I I t s F I 4 \J an HERBERT A. \SILVEN A ril 15, 1947. H. A. slLvEN ,419, 7

GRINDING MACHINE-STEADY REST 4 Sheets-Sheet 3 Filed March 17,- 1945 awe/WM HERBERT A. SILVEN A ri 15, 1947. H, EN 2,419,170

GRINDING MACHINE-STEADY REST Filed March 17, 1945 4 Sheets-Sheet 4 gvvuwvbo'b HERBERT A. Saws/v- WW Wk W a spring Patented Apr. 15, 1947 2,419,170 GRINDING MACHINE STEADY REST Herbert A. Silven, Worcester, Mass., assignor to Norton Company, Worcester, Mass, a corporation of Massachusetts Application March 1'7, 194.5,Se1'ialNo. 583,187

13 Claims.

The invention relates to grinding machines, and more particularly to a steadyrest for supporting and steadying a work piece during a grinding operation.

One object of the invention is to provide a simple and thoroughly practical steadyrest for a cylindrical grinding machine. of the invention is to provide a steadyrest which may be rapidly and readily moved to and from an operative position.

Another object of the invention is to provide a two-bearing shoe type steadyrest which is pivotally mounted and arranged so that it may be swung to and from an operating position to facilitate a longitudinal indexing movement of the work table or steadyrest relative to a crankshaft or the like. Another object of the invention is to; provide a steadyrest in which the bearing shoes are pivotally mounted so that they may be swung to and from an operative position by means of a fluid pressure actuating mechanism so that the shoes may be removed to a point remote from the work piece to facilitate indexing of the work piece relative thereto.

Another object of the invention is to provide a steadyrest in which the steadyrest shoes are automatically advanced and maintained in operative engagementwith the work during grindin Another object of the invention is to provide automatic means to retract the steadyrest shoes after a grinding operation has been completed.

Another object of the invention is to provide a spring-{actuated means for automatically advancing a steadyrest shoe and maintaining it in operative engagement with the work during grinding. Another object of the invention is to provide a hydraulically operated mechanism automatically to return the steadyrest shoes to their initial position after a grinding oteration has been completed.

Another object of the invention is to provide a steadyrest of the two-bearing shoe type in which a pair of independent nut and screw mechanisms are provided for adjusting the shoes to maintain them in the desired steadying engagement with the work during a grinding operation. Another object of the invention is to provide a steadyrest with a nut and screw adjusting mechanism for the steadyrest shoes which is spring actuated automatically to advance the shoes to maintain them in operative engagement with the work piece as it is being ground.

Another object of the invention is to provide actuated mechanism for maintaining the work steadying shoes in operative contact with Another object the work piece as it is ground away, combined with a hydraulically operated mechanism for returning the shoes to their initial position after a grinding operation has been completed. Other objects will be in part obviousor in part pointed out hereinafter. J

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 various possible embodiments of the mechanical features of this invention,

Fig. 1 is a side elevation of the improved steadyrest;

Fig. 2-is a front elevation of the steadyrest shown in Fi 1;

Fig. 3 is a plan view, on an enlarged scale, of the improved steadyrest;

Fig. 4 is a fragmentary vertical sectional view, on an enlarged scale, taken approximately on the line 4-4 of Fig. 1;

Fig. 5 is a fragmentary vertical sectional view,

- on an enlarged scale, taken approximately on the line 5-5 of Fig. 1;

Fig. 6 is a vertical sectional view, on an enlarged scale, taken approximately on the line 6-6 of Fig. 1, showing the spring and fluid pressure mechanism for actuating the steadyrest shoes;

Fig. 7 is a fragmentary horizontal sectional view, on an enlarged scale, taken approximately on the line 1-1 of Fig. 1, showing the adjusting mechanism for the horizontal work steadying shoe;

Fig. 8 is a fragmentary cross-sectional view, taken approximately on the line 8-8 of Fig. 6;

Fig. 9 is a fragmentary front elevation, on an enlarged scale, of the steadyrest; I

v Fig. 10 is a fragmentary side elevation of the mechanism shown in Fig. 9;

Fig. 11 is a detail view of knobs; and

Fig. 12 is a diagrammatic illustration of a modified construction in which fluid under pressure serves to advance the steadyrest shoes.

A steadyrest has been illustrated in the drawings mounted upon a grinding machine table 10 which is arranged for a longitudinally reciprocatory movement relative to the base of the machine, as is old and well known in the prior art. The improved steadyrest is particularly adapted foruse on a crankshaft grinding machine such as, for example, that shown in the the shoe actuating prior U. S. patent to Herbert A. Silven, No. 2,151,666, dated March 21, 1939. In a machine of this type the steadyrest is automatically located on the machine table and is arran ed so that it may be positioned opposite the operative face of a rotatable transversely movable grinding Wheel ll so that the steadyrest shoes will support and steady a'workpiece, such as a'pin12of a crankshaft to be ground. The steadyre'st frame together with the steadyrest shoes are arranged so that they may be readily moved to and from an operative position so that after one'pin on the crankshaft has been ground, the steadyrest may be readily moved longitudinally"relative"to the table to position it in supporting engagemnt'with another crankpin after the crankpin has been positioned in operative relationwith the gri-nding wheel H.

A steadyrest base I5 is provided which'may' be readily clamped in position on the work sup-- "p'oitiiig' table ID The under surface'of the "st'eadyr'e'st is provided with "supporting bearing "surfaces 1'6, l 7, Band "i 9 which'matawith'corre- "s'pciidingly shaped surfaces on the work sup p'o'rtingtable ii]; A' clampingblock "261s 'supported on the steadyrest frame? and serves to clamp the steady're'st base securely in' an operati ve po'sitio'n'on the table Ill.

The 'st'eadyrest ba'se 'i'5is preferably formed as "*a "hollow casing" havinga pair of' upwardly extending side plates 2-'i"'and"25' which serve as a support and guide for apivotallymounted steady- 'rest frame 26. The steadyrest frame ZB' is pivotally" supported on a stud" 21 whichfis fixedly mounted flo'nthe nae plates *24 "and '25 of the i steadyrest base I 5.

The steadyrest frame 26 serves as"'a"'support "forapair'of work"steadyingshoes'n and 29. The steadyrest shoe 23 is preferably positioned "and" arranged toengage the fwork pieceat a*- point substantially diametrically "opposite the point of contact between" the grinding wheel I I and the work piece l2. The 'sh'oe'28 *is mounted on the forward end of a horizontally adjustable sIide' SU-"Which slides within-anaperture 'formed within' the stead'yrest' frame 26. A nut and screw adjusting mechanism is providd for adjusting the position of-the' slide'30 'coriiprising-a manually bperablekneb 3 I which-'m oi'inted on' the outer end of anadjusting screw 32. --'I-he'- s'crew -'32--is screw-threaded into a -thr'eaded a ertereformed -=in theslide Bil (Figs ram '7) 'The adjusting rew 32 is 'rotatably supported-in the stead'yrest ai hB -Z fi afid is -he1d a grairrst axial movement relative thereto-earners rotary adju stinenfl of the screw 32 is transmitted to cause a transverse -=ad-justinent of the slidetil and-the shoe 28.

The steadyrest shoe- 29 is preferably arranged *to'engage the under side 'of thework piece l2 at a point adja'cent-totheline'of' contact be-- -tween the grinding wheel I landthe work piece 12. The shoe 26 is mounted on a support'ing-arm 33 which is' in turn pivotally' supported on a stud 34 carried by the steadyrest frame 26.

Td-facil'itateadjustment of the arm 33, a 'trans- 'vrsely adjustable slide "member 34 is' -slidably mounted within the -frame-' '26. The forward or "right-hand 'end offthe-slide 34 (Fig. l) is prov'ided with -a-cam face 35 engaging a' roller 36 is screuf'threaded ihto-a'threa'ded aperture in-the a linlr'ai'l.

heated by astud 58-with the right-handend of the'piston'rod59 (Fig. 1). 'A piston 60 is formed 55 v disclosure that adjustment of the slide 34 either toward or fromfthe wheel I l'will transmit a swinging'motion to the arm- 33 throughthe' roller 36 so as to move the work steadying shoe 29 either toward or from the surface of the work piece 12.

In ordertoattain one object of this invention, it is desirable to provide a su table controlling -n'iecha'nism for swinging the steadyrest frame #26 toarid from an'operative position so that when in an operative position, the shoes 28 and 29 are in a position remote from the work piece [2.

This mechanism may comprise a pivotally mountea'armls which is pivotally supported on a stud 46 carried by the steadyrest base [5. The upper -elndof the=arm is provided-"witha roller 41 which 'is supported on a *"stud 43 carried by the "arm ifi "The roller 47 is arranged -to engage-a plane surface 39 formed on thestea'dyrest frame 26. *Inordertomaintain the frame 26 in'a-predetermined relationship with the arm 45 during movement-to and from an operative position,

the "stud43 which supports theroller 4'! is *provided with two outwardly extending 'pinsor studs 50 and 5d (Fig. 4) which 'slide-within' slots 52 and -53, respectively, formed-in opposite "side plates of'the frame 26. -An adjustable stop screw 54 is provided on the steadyrest -basemmberprecisely to'locate the-steadyrest frame 26 when in arr-operative position.

It will be readily apparent from the foregoing disclosure that if the arm 45 is swung-in a' coun- --terclockwise direction, the roller 4 Twill run along the surface 4% andthepi-ns Sir-and 51' riding with- 40 in'the grooves 52 and 53, respectively? will cause the frame 26 'to swing downw'ardly'in a' clockwise direction (Fig.1) to aninoperative position 26a,

' as shown in-dotted lin'es'lin-Fig; l, withthe work steadying shoes 28' and '29 assuining dottd' line positions 28a a1'iol 29a.

To facilitate'movem'ent of the steadyre'st frame '26*to and:from anpperative position, a fluid extending arm 55 which-projects'below the stud 46. The-arm 55 is connected by a-stud 56 with The other end of the link 51 is cone'ither int'egral' withor fixedly mounted on' the leit ha'rideridbf the-piston mass. The" piston Eiiiis'slidably mounted within a cylinder 6| which -'is formed integral with or fixedlyin'ounted on i the steadyrest base j 5.

When fluid under pressurefrom a: source of 1 supply is admitted through a-pipe 62 intoa cylinder chamber 63, the: piston 69 is 'moved toward the left into the position illustrated in Fig. 1

"with the frame 25 and thefworksteadying shoes piece' i2. When it is desiredto move the steady- "re'st frame 26'together with thework steadying 28 and 29 in operative engagement with the work 1 shoes-28' and 29130" an'inoperativeposition, fluid 60' to'move towardthe right (Fig. 1), which under pressure is admitted through a pipe '64 intoa cylinder chamber 65 to'ca'use'the piston movement rocks the arm 45in acounterclock- "wi'se direction into dotted line rp'osition'- 45a (Fig. -l)-and swings the steadyrest frame 26=together *with'the work' steadying shoes 28 arid= 29 into the pinion dotted line positions 29a, 23a and 29a shown in Fig.1. I I

In order to attain one object of the invention, it is desirable to provide automatically operated means for actuating the adjusting screws 32 and 39 so that the work steadying shoes 28 and 29 may be maintained in operative engagement with the work piece I2 at the desired pressure asthe work is ground away during a grinding operation. In the preferred form of this invention, a combined compression spring and hydraulic mechanism is provided for turning the adjusting screws 32 and 39 to advance the work shoes during a grinding operation and thereafter to return the'work shoes 28 and 29 to their initial position.

The adjusting screw 32 is provided with a gear or pinion III which is formed thereon between the knob 3| and the screw threaded portion 32. The

pinion I meshes with a rack bar II which is fixedly mounted on the upper end of a piston rod I2. A piston i3 is either formed integral with the piston rod I2 01' is fixedly mounted thereon. The piston I3 is slidably supported within a cylinder 14. When fluid under pressure is admitted through a passage into a cylinder chamber 16, it will cause an upward movement of the piston I3 (Fig. 6) to move the rack II upwardly and thereby cause :a counterclockwise rotation of the I0 and the adjusting screw 32. A compression spring I1 is provided within the cylinder l4 which surrounds the piston rod I2 and is interposed between the piston I3 and the upper head of the cylinder I4. The compression of the spring 'II serves normally to exert a downward pressure tending to cause a downward movement of the piston I3, which movement serves to cause a I downward movement of the rack 'I and thereby to transmit a clockwise rotation to the pinion I0 and the screw 32. An adjustable stop screw I8 is provided to limit the downward movement of the rack bar 'II and the piston I3. A stop screw I9 is provided to limit the upward hydraulic movement of the piston I3 and the rack bar I0 so as to limit the counterclockwise rotation of the pinion I0 and the screw 32. 1

A similar mechanism is provided for actuating the steadyrest shoe adjusting screw 39. The screw 39 is provided with a pinion 80 which meshes with a rack bar 8|. The rack bar 8| is fixedly mounted on the lower end of a piston rod 82. A piston 83 is either fixedly mounted on or formed integral with the piston rod 82 and is 'slidably supported within a cylinder 84. When fluid under pressure is admitted through a passage 85 into a cylinder chamber 89, it will cause a downward movement of the piston 83 which serves to rotate the pinion 80 and screw 39 in a counterclockwise direction. A compression spring 81 is provided within the cylinder 84 surrounding the piston rod 82 and is interposed between the piston 34 and the lower head of the cylinder 84. A stop screw 88 serves to limit the upward movement of the piston 83 under the influence of the compression spring 8?. An adjustable stop screw 89 serves to limit the downward movement of the rack bar'SI and the piston 03 so as to limit the hydraulic counterclockwise rotation of the pinion 80.

-The springs 11 and 31 are utilized to transmit a rotary motion to the adjusting screws 32 and 39 to advance the work steadying shoes 28 and 29 as the work is reduced in size during grinding and serve to maintain a desired operating pressure between the shoes 28 and 23 and the work piece I2. The hydraulically operated pistons I3 6 are utilized to rotate the adjusting screws 32 and 39, respectively, in opposite directions to" retract the work shoes 28 and 29 to their initial position after a grinding operation has been completed. While a compression spring has been illustrated for rotating the adjusting screws 32 and 39 during a grinding operation, it should be understood that these springs may be eliminated and fluid under pressure admitted through a pipe 15a into the upper chamber 160. of the cylinder I4 and through a pipe a into the lower chamber 33a of the cylinder 84 to provide an advancing movement of the work steadying shoes 28 and 29 under the influence of fluid under presand 83 sure, if desired.

At the start of a grinding operation, it is desirable for the grinding wheel II to engage the periphery of the work piece I2 and grind off any irregularities and round up the work piece before the steadyrest shoes are moved into operative enbell crank lever 30 is provided with a forwardly extending actuating arm 32. The bell crank lever is also provided with an upwardly extending arm 93 which carries a stud 94. The stud 94 is arranged in the path of a lug 95 projecting from and formed integral with the knob 3|. 7 It will be readily apparent that the lug 95 engaging the stud 94 will hold the spring I? under compression by preventing the knob 3| from rotating in a clockwise direction. A spring-pressed plunger96 (Fig. 10) is provided normally to urge the bell crank lever 90 in a counterclockwise direction (Fig. 10) to maintain the stud 94 in the path of the lug 95.

When it is desired to release the compression of the spring 1I automatically to move the shoe 23 into operative engagement with the work piece I2, the arm 92 of the bell crank lever 90 may be moved upwardly (Fig. 9) to swing the bell crank lever 90 in a clockwise direction (Fig. 10) so as to throw the stud 94 out of the path of the lug 95 on the knob 3|, thereby releasing the compression of the spring II which automatically rotates the screw 32 to advance the work shoe 28 into operative supporting and steadying engagement with the work piece I2.

A similar latch mechanism is provided for latching the spring 81 under compression. This mechanism comprises a bell crank lever I00 which is pivotally supported on a stud WI. The bell crank lever I00 is provided with a forwardly extending, manually operable arm I02. The bell crank lever I00 is also'provided with a downwardly extending arm I03 which carries a stud I04. The stud I04 is arranged normally in the path of a stop lug I05 (Figs. 1 and 10) formed integral with the knob 38. The details of this stop lug I05 have not been illustrated since it is identical to the stop lug shown on the actuating knob 3| in Fig. 11. A spring-pressed plunger I06 normally serves to maintain the bell crank lever I00 in a position so that the stud I04 lies in the path of the stop lug (not shown) formed on the actuating knob 30. When it is desired to release the compression of the spring 81,.the arm I02 is moved downwardly to rockthe bell crank latch mechanism whereby the g lever I110 in a counterclockwise direction (Fig.

leases the compression of. the spring 81 and therebycauses an upward movement of thexrack bar 81 to transmit a clockwise rotation to the pinion 80. so as toadvance the slide 34 and thus move the workshoe 2 9 into operative supporting engagement with the work piece I2 and to maintain it incontact therewith at the desired pressure as the work piece is reduced in size during the grinding operation.

The cylinders I4 and 84 are adjustably mounted onthe swinging frame 26. In order to supply fluid under pressure for actuating thepistons I3 and 83, fluid under pressure is preferably passed through the pipe 64 intoa passage III) formed in the steadyrest base I into a groove or chamber III formed in the periphery of the pivot stud. 21 and into an axially extending bore II2 formed in the pivot stud 2'I. Fromthe central bore III fluid under pressure passes radially into a groove I I 3 formed in the periphery of the stud 21. From thecgroove or chamber II3 surrounding the stud 2I, fluid may pass through a passage H4 and a passage II5 which connects with the passage I5 to admit fluid under pressure to the cylinder chamber .26 at the .lower end of the cylinder 84. Fluid under pressure entering the chamber II3 surrounding the stud 2'! may also pass through a passage II6 which connects with the passage 85 to admit fluid under pressure to the cylinder chamber 86 so as to cause a downward movement of the piston 83'. It will thus be readily apparent from the foregoing discdosure that fluid under pressure may be readily transmitted to the cylinders I4 and 84 in any position of the frame 26. Inorder to facilitate a manual adjustment of the work steadying shoes 28 and 29 by means of actuating knobs 3| and 38, respectively, it is desirable to provide suitable means for disconnecting. the rack bar II from the pinion I0 and the rack bar 8| from the pinion 80. When the rack bars II and BI are disengaged from the pinions 10 and 80, respectively, the shoes 28-and 29 maybe readily adjusted manually for the purpose of setting up the rest for a given Work piece by actuation of the knobs 3| and 38, respectively. The cylinder 14 is preferably adjustably mounted on the steadyrest frame 26 by means of a pair of screws I20 and I2I. The screw IZIlserves as a pivot stud for the cylinder 14 and associated parts. The screw I2I passes through an elongated slot I22 formed in the cylinder block. It will be readily apparent from the foregoing disclosure that by loosening the screws. I20 and I2I, the cylinder block I4 may be readily swung in a clockwise direction so that the rack :bar 1| is thrown out of engagementwith thepinion I0, after which the steadyrest shoe 28' may be readily adjusted by manual rotation of the knob 3| Similarly, the cylinder block 84 is adjustably mounted on the frameEli by means of a .pair of screws I24 and I25. The screw 'I24eserves as a pivot stud; The screw I25 passes through an elongated slot I26 in the cylinder, "block-.34. It will be readilyapparent from-:the foregoingidisclosure that when it is desired to disconnect the rack bar 8|, the screws. 124 and I25 may be loosened, after which the cylinder-block 84may be swung in at clockwise-direction to disengage the rack bar ill from the pinion 8E1, th'us allowing a manual adjustment of the steadyrest shoe 29 by rotation of the actuatingrknobBB'.

The: fluid pressure actuation of. the .screws 32 and .33'may be readily timed with the other operating mechanisms of the machine by connecting the. passage IIU (Fig. 8) so that fluid will beadmitted through the passage H4 in timed relation with the operation of the other mechanisms on the grinding machine.

The operation of this improved steadyrest will be readily apparent from the foregoing disclosure. Assuming, adjustments have previously been made,.a work piece I2 is placed in position on themachine and fluid under pressure is admitted through the pipe 62 into the cylinder chamber 63 to move the piston 60 toward the left (Fig. 1) so as to swing the arm 45 in a clockwise direction into the position illustrated in'Fig. 1 so that the steadyrest frame 26 is swung upwardly to anoperating position. The grinding wheel II may then be fed into grinding engagement withthe work to rough grind or round up the surface of the work. I 2, after which the trip levers 92 and EUZr-may beactuated to release the compression ofrthe springs I1 and 81, respectively, which serve in the manner above described automatically to rotate the- screws 32 and 39 to move the shoes 28 and 29, respectively, into operative engagement with the surface of the work piece I2 and to maintain the shoes in operative contact therewith at a desired pressureas the work piece I2 is reducedin size due to grinding. If desired, the

. lower work steadying shoe 29 may be moved into engagement with the work piece I2 before the horizontal shoe 28 is moved into engagement therewith by trippin the latch so as to release the compression of the spring 81 before the compression of the spring 'Ilis released. Or, if desired, the. horizontal shoe 28 similarly may be moved into engagement with the work piece I2 prior to the movement of the lower shoe 29 into engagement therewith.

After a grinding operation has been completed, fluid under pressure may be passed through the pipe 64 into the passage H0 in the steadyrest base I5 through the chamber II2 surrounding the stud 21, through the central bore II I, and into the passage II3 surrounding the stud 21, and then through either the passage I I4 or II5 into the cylinder I4 and through the passage I IB to the cylinder 84 to actuate the pistons 73 and 83, respectively, to turn the pinions I0 and 8|] in a counterclockwise direction so as to move the steadyrest shoes 28 and 29 out of operative engagement with the work piece I2 and to.return-them to their initial position ready for the next grinding operation.

When fluid under. pressure is admitted through the pipe 64, due to the fact that less pressure is required to actuate the pistons I3 and 83, the steadyrest shoes 28 and29 are first moved out of operative engagement with thework piece I2, after which fluid passing through the pipe 64 into the cylinder chamber 65 serves to swing the steadyrest frame to an inoperative position.

It willthus be seen that there has'been provided by this invention apparatus in which the Various objects. hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made inthe embodiment above set'forth, it is to be understood that all matter hereinbefore et forth'or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

I claim: 1. .In a grinding'machine having a steadyrest comprising a steadyrest base, a pivotally mounted steadyrest frame, a work steadying shoe adjustably mounted on said frame, means to adjust said shoe relative to said frame, means including a movable arm engagable with said frame, slidable connections between said arm and said frame, mean to move said arm to move the frame and steadyrest shoe to and from an operative position, and means automatically to move said shoe, adjusting means automatically to feed and maintain said shoe in engagement with the work during a grinding operation.

2. In a grinding machine having a steadyrest comprising a steadyrest base, a pivotally mounted steadyrest frame on said base, a stud on said base which serves as a pivotal support for said frame, a work steadying shoe adjustably mounted on said frame, means to adjust said shoe relative to said frame, means including a pivotally mounted arm having a roller engageable with said frame, means to swing said arm to move the frame and steadyrest shoe to and from an operative position, and means automatically to actuate said shoe adjusting means automatically to maintain said shoe in engagement with the work during a grinding operation.

3. In a grinding machine having a steadyrest comprising a steadyrest base, a pivotally mounted steadyrest frame on said base, a stud sup-ported on said base which serves as a pivotal support for said frame, a work steadying shoe adjustably mounted on said frame, means including a nut and screw mechanism to adjust said shoe relative to said frame, means including a pivotally mounted arm having a roller engageable with said frame, means to swing said arm to move the frame and steadyrest shoe to and from an operative position, and means automatically to actuate said nutand screw mechanism automatically to maintain said shoe in engagement with the work during a grinding operation.

4. In a grinding machine having a steadyrest comprising a steadyrest base, a pivotally mounted steadyrestframe on said base, a stud supported on said base which serves as a pivotal support for said frame, a work steadying shoe adjustably mounted on said frame, means including a nut and screw mechanism to adjust said hoe relative to said frame, means including a pivotally mount ed arm having a roller engageable with said frame, means to swing said arm to move the frame and steadyrest shoe to and from an operative position, andmeans including a spring operatively connected to actuate said nut and screw mechanism automatically to maintain'said shoe in engagement with the work during a grinding operation.

5. In a grinding machine having a steadyrest comprising a steadyrest base, a pivotally mounted steadyrest frame onsaid base, a stud supported by said base which serves as a pivotal support for said frame, a work 'steadying shoe adjustably supported on said frame, means including a nut and screw mechanism to adjust said shoe relative to said frame, means including a pivotally mounted am having a roller engageable with said frame, means including a piston and cylinder operatively connected to swing said arm to move said frame and steadyrest shoe to and from an operative position, means automatically to actuate said nut and screw mechanism to move said shoe into operative engagement with the work and to maintain the shoe in operative engagement therewith during a grinding operation, and means automatically to rotate said shoe adjustopposite direction to reposition grinding operation has been ing screw in the the shoe after a completed.

6. In a grinding machine having a steadyrest comprising a steadyrest base, a pivotally mounted steadyrest frame on said base, a stud supported by said base which serves as a pivotal support for said frame, a work steadying shoe adjustably supported on said frame, means including a nut and screw mechanism to adjust said shoe relative to said frame, means including a pivotally mounted arm having a roller engageable with said frame, means including a piston and cylinder operatively connected to swing said arm to move said frame and steadyrest shoe to and from an operative position, means including a spring au-' tomatically to actuate said nut and screw mechanism to move said shoe into operative engagement with the work and to maintain the shoe in operative engagement therewith during a grind-. ing operation, and means including a piston and cylinder automatically to rotate said shoe adjusting screw in the opposite direction to re-position the shoe after a grinding operation has been completed.

'7. In a grinding machine having a steadyrest, a steadyrest base, a pivotally mounted steadyrest frame on said base, a work steadying shoe adjustably supported on said frame, means including a manually operable mechanism to adjust said shoe relative to said frame, a pivotally mounted arm having a roller engageable with said frame, means to swing said arm to move said frame and steadyrest shoe to and from an operative position, normally latched means which is arranged to actuate said shoe adjusting mechanism in one direction to maintain the shoe in operative engagement with the work during a grinding operation, means including a piston and cylinder to adjust said shoe adjusting mechanism in the opposite direction to reposition the shoe after a grinding operation has been completed, and a manually operable latch on said steadyrest frame to release said normally latch means automati- 'cally to move the shoe into engagement with the work and to maintain it in engagement therewith during a grinding operation.

8. In a grinding machine having a steadyrest, a steadyrest base, a pivotally mounted steady-- rest frame on said base, a work steadying shoe adjustab-ly supported on said frame, means including a! manually operable nut and screw mechanism to adjust said shoe relative to said frame, a pivotally mounted arm having, a roller engageable with said frame, means including a piston and cylinder operativelyv connected to swing said arm to move said frame and steadyrest shoe to and from an operative position, a normally latched spring which is arranged to turn said shoe adjusting screw automatically in one direction tomove the shoe intooperative engagement with the workand to maintain the shoe means including a piston and cylinder to rotate said shoe adjusting screw in the opposite direction to re-position the shoe after a grinding operation has been completed, and a manually operable latch on said steadyrest frame to release said spring automatically to allow the spring to move the shoe into operative engagement with the work.

9. In a grinding machine having a steadyrest, a steadyrest frame, apair of work steadying shoes adjustably supported on said frame, an independent nut and screw mechanism independin operative engagement therewith during a grinding operation,

11 ently: to adj ust-each: of said' shoes relative: toasaid frame, means including an independent normal.- ly latched spring independently to actuatereach of said screws to move thesshoesinto operative engagement with the work an'dito-maintain them in engagement therewith during a grinding :operation, means including an .independent piston and. cylinder to rotate. said shoe adjusting. screws inthe opposite direction independently-to lie-position said shoes after a grinding operation has beencompleted, .andaepair of independently op-- erated,.manually operable latches onxsaidsteadyrest frame to. release said springs automatically to allow said springs. independently 'to move-the sho'esinto engagement with the workxancl to maintain them in engagement therewith during a grinding operation.

10., In a grinding machine. having a steadyrest comprising "a steadyrest base, a pivotally mounted steadyrest-frame onzsaid base, a stud supported on said-base which serves; as apivotal supporttforsaid; frame, a pair of-.-Worksteadying shoes .adjustablymounted on said frame, means including an independent nut and-screw :mechanism to adjust each of said shoes relative to. said frame, means including a-pivotally mounted arm having a. roller engageable with said frame, means-to-swing said arm to move the frame and steadyrest shoes to and from an operative position, means including a spring operatively con.- nected :to actuatesaid nut 'and screw mechanism automatically to move said shoes into engagement with said Work and to maintain said shoes in operative-engagement with the work during'a grinding operation, anda manually operableadjusting knob -oneach ofsaid shoe adjusting screws-whereby thepressure-of theshoes against the work; ;may be manually increased or decreased asdesired.

11-. Ina grinding machinehaving a steadyrest, a steadyrest frame,.-a- .pair. of work steadyingshoes adjustablyisupportedon said frame, anindependent nut and screw mechanism independently to adjust each of said'screws relativeto said frame, an: independent rack and gear mechanism independently to-rotate each ofsaid screws, means including an independent normally latched spring independently to actuateeachof said rack and pinionstomovesaid shoes into operative engagement with the work and to-maintain themv in engagement therewith during a. grinding operation, means including an independent pistonand cylinder to rotate each of said shoe adjusting screws inthe opposite direction independentlyto re-position; saidshoes after a. grinding operation hasbeencompleteda manuallyoperableknob on eachof said. shoe adjusting screws, and means for disconnecting each. of said rack and pinions so thattheshoe adjusting screwsmay be manuallyadjusted. to position both of the work. shoes 'relativeto said frame.

.12.. In a grinding machine havinga steadyrest, a steadyrest basaa pivotally mounted steadyrest Lframeonsaid base,.a.pair.oi work steadying shoes .adiustably, supported onsaidlframelmeans'includ- Number ing an independent manually operable-mat; and screw mechanismindependently. toadjust eachzof said shoes relative to said frame, a pivotally mounted arm having -a roller engageable with said frame, means including a piston and cylinder operatively connected to swing :said :arm to move said frame and steadyrest shoes to and from an operative position, independent spring :actuated means independently to turn said shoe adjusting screws automaticallyin one direction to move the shoes into operative engagement with the workv and to-maintain the'shoes in operative engagement, therewith during a grinding .operation, means including an independent piston and cylinder to rotate each, of said shoe adjusting screWsin-the, opposite direction .to re-position-the shoes after a grinding operation has been completed, and. fluid pressure interconnections, be.- tween theframe actuating cylinder and theishoe rte-positioning cylinders. whereby the. shoes are automatically withdrawn from engagement with the Work beforethe steadyrest frame is swung to an, inoperative position.

13. In a grinding machine having a steadyrest, a steadyrest base, apivotally mounted steadyrest frame on said base, a pair of work steadying shoes adjustably supported on said frame, a pivotallymounted'arm having a roller engageable with: said frame, means including a piston and cylinder operatively connected to swing. said arm to move saidjframe and steadyrest shoesato-and. from an operative position, an independent nutand screw -mechanismindependently toadjust each-of. saidshoes relative to said frame, ,meansincluding anindependent normally latched spring independentlyto actuate each .of said. screws to move the shoes .into operative; engagement. with, the work and to maintain them. in engagement. therewith during a grinding operation; meansincluding an independent pistonand cylinderv to rotate saidshoe adjusting screws v the. opposite-direction independently to repositionisaid shoes after a grindingoperationhas been completed, and apair .of independently operated, manually operable latcheson said steadyrest-frame to .releasesaid springs. automatically .to allow. said. springs .independently to. move. the shoes into. engagement withthe. work .and..to maintain, them n. engagement therewith during agrinding-operation.

HERBERT A., SILVEN.

REFERENCES CITED The following references are of record, in the file of' this patent:

UNITED STATES PATENTS Name I Date Landis Sept. 27, 1904 Hollengreen-. June 16,1942 ,Smith et. al. ,May- 29, 1934 FOREIGN PA'IENTS Country v.Date Germany May 2, 1911 Number

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