US1575156A

US1575156A - Grinding and polishing machine

Info

Publication number: US1575156A
Application number: US652254A
Authority: US
Inventors: Ecaubert Frederic
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-07-18
Filing date: 1923-07-18
Publication date: 1926-03-02
Anticipated expiration: 1943-03-02

Description

March 2 1926.

F. ECAUBERT GRINDING AND POLISHING MACHINE Filed July 18, 1923 5 Sheets-Shedl l Mwah 1?@26. 1,575,156

' F. ECAUBERT GRINDING AND POLISHING MACHINE Filed July 18, 192?. 3 Sheets-Shea*l 2 ImmIl March 2 1926. ,575,56

F. ECAUBERT GRINDING AND POLISHING MACHINE Filed July 18, 1923 5 sheets-Sheet s Patented Mar. 2, i926.

UNITED STATES FREDERIC ECAUBERT, 0F NEW YORK, N. Y.

GRINDING AND POLISHING MACHINE.

Application filed July 18, 1923.

To all whom t may concern.'

Be it known that I, FREDERIC .EGAUBERL a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented an Improvement iii Grinding and Polishing Machines, of which the following is a specification. n

My present invention relates to a grinding and polishing machine of the type particularly adapted for grinding and polishing diamonds or other precious stones Whether real or artificial. The machine made in accordance with the invention comprises a revoluble lap member together with a revoluble drum or work carrying member adapted to revolve in opposite directions and so constructed that the revoluble work member preferably oscillates over the lap member in order to bring the surface of the article to be ground successively into contact with all portions of the grinding surface of the lap member, the oscillating movement being so conti'olled as to cause a substantially even wear on the entire surface of the lap member. These features of the apparatus comprise the subject matter of a copending application` Serial No. 652,253` tiled July 18, 1923.

The part of the apparatus to which the present invention is more particularly directed relates to the construction of the revoluble work holding member and the inaniier by which the several work holders are detachably mounted and locked in position, as well as devices for regulating the extent of the surface to be ground and polished, and means for shifting the work holder automatically so as to remove the surface of the article from the grinding surface of the lap when the cut has been made to a predetermined extent, all of which will be hereinafter more particularly described.

ln the drawing:

Fig. 1 is a sectional elevation illustrating a grinding and polishing machine made in accordance with my present invention.

Fig. 2 is a plan of the same.

Fig. 3 is an enlarged sectional elevation illustrating the revoluble work carrier and the parts associated therewith to which the present invention more particularly relates.

Fig. 4 is a sectional plan t ken on line 4 4, Fig. 3.

Fig. 5 is an enlarged sectional planpon line 5-5, Fig. 3.

Fig. 6 is a section on line 6-6, Fig. 5, and

Serial No. 652,254.

Fig. 7 is a sectional plan taken on line 7 7, Fig. 3.

The machine made in accordance with this invention comprises a base 10 on which, in a suitable position, there is a pedestal l1 supporting a bearing 12 in which a rocker shaft 13 is .mounted and also supporting a bearing 14 1n Which a shaft 15 is jouriialed. On the shaft 15 a worm Wheel 16 is suitably secured to mesh with a worm 17 mounted on a shaft 18 which is journaled in suitable bearings 19 also connected to and supported by the pedestal 11. As indicated, the shaft 18 is fitted with a pulley 20 by which, from a suitable source of power, the shaft 18 is driven to turn the shaft 15 through the Worm gear .16 and worin 17. Fixed in an offset position and extending from the face of the Worm gear 16 is a pin 21, the function of which will be hereinafter described.

In a suitable position the'base 10 is also provided with a bearing 22 and an arm 23 which terminates in a bearing 24 directly above the bearing 22 in order to journal a shaft 25. A lap member 26 is connected t0 the shaft 25 above the bearing 24 and the grinding surface of this lap member is preferably recessed centrally as indicated at 27 so that the grinding surface is annular 1n configuration. The shaft 25 and the lap member 26 may be driven by a pulley 28 fixed in position on thc shaft by a set screw 29 and made to revolve from any suitable source of power.

Connected at the upper end of the rocker shaft 113 is a lever 30. As illustrated the upper end of the shaft 13 is preferably of reduced diameter to receive a bearing provided therefor as indicated `at 31 in the lever 30 and this lever is secured in position by means of a nut 32 turned down on the screw threaded end of the rocker shaft 13 or otherwise. The right hand end of the lever 30 as illustrated in Figs. 1 and 2, is slotted at 33 to receive the pin 21 by means of which, as Will be understood, due to the eccentric position, in which the pin is set in the Worin gear, an oscillating movement will be imparted to the lever. At the opposite end of the lever the same is constructed to receive the end of a shaft 34.

T he shaft 34 is fitted with a collar 35 and the end of the shaft is adapted to pass through a bearing provided therefor in the end of the rocker lever 30 so that the shaft may be secured in position by means of a nut or otherwise. Surrounding the shaft 34 there is a worm gear 36 adapted to mesh with a suitable worm, so as to be driven from any suitable source of power. The worm gear 36 is suitably connected to a revoluble work carrying member, the outer hub 37' of which is connected to the worm gear 36. This work carrying member preferably comprises a hub 38 and plates 39 and 4t), the hub being journaled on the shaft 34 'and maintained in position by means of a nut 41 turned down into a recess provided therefor in the end of the hub. Outside of the plate 39 the outer hub 37 is provided with a shoulder 42 over which there is fitted a disk 43. The diameter of the disk is appreciably lar er than the diameter of the plate 39 so t at the peripheral portion of the disk overhangs the peripheral portion of the plate. ln suitably spaced positions in the periphery of the disk 43 there are notches 44, and in similar positions in the periphery of the plate 39 there are notches 45. As illustrated there are four sets of these notches employed inasmuch as four separate and distinct work holding units are lllustrated.v It will be understood, however, that any desired number of work holder units may be employed and that there is a corresponding number of the

notches

44 and 45. lt will furthermore be understood that the peripheral portion of the plate 40 is notched in similar positions and in the same manner as the plate 39. Each of the notches 45 in the plate 39 is defined by oppositely disposed parallel walls 46 extending predetermined distances fromv the periphery of the plate and terminating in an undercut cireularly disposed base 47. Each of the notches in the plate 40 is indicated at 48. The oppositely disposed parallel walls thereel are designated at 49 and the undercut circularly disposed base portion at 50. Each set of these notchesis adapted to receive a work holding unit which may be connected and locked and unlocked and disconnected therefrom so as to maintain the work holder unit in position and to make the same entirely removablev from the revoluble work carrying member.

As hereinbefore stated, any number of work holder units may be employed, and as these are similarly constructed ut one of them will be described in detail. Each work holder unit, therefore, preferably comprises a spindle 51. At one end'the spindle 51 is provided with a work holder 52 adapted to receive in any suitable manner a dia-mond or other precious stone in which the surface or a plurality of surfaces are to be ground or cut. and polished. Adjacent the opposite end ofthe spindle 51 the same is provided with a sleeve 53. This sleeve is revoluble and slidable on the spindle 51 and is provided with oppositely disposed flattened sides 54, the

Lannoo distance between which is substantially the same as the distance between the oppositely disposed parallel faces 46 partially deiining the notches 45. The ends of the sleeve 53 are made on the are of a circle, the diameter of whichv is substantially the same as that of the circularly disposed base portion 47 of the notches 45. The sleeve 53 includes a flange 55 adapted to bear against the inner surface of the plate 39 and also a flange 56 adapted to bear against the outer` surface thereof. `Connected to this flange-56 is au arm 57 carrying a button or handle 58 onv the outer side thereof and a pin 59 on the inner side thereof, the pin 59 being adapted to engage with a recess provided therefor in the disk 43. lt will be understood that the arm 57 may be sudciently resilient to yieldingly permit the pin 59 to ride over the face ot the disk before being seated in the recess provided therefor, or the button 58 and the pin 59 may be spring' actuated or otherwise yieldingly mounted inthe arm so as to permit the pinto be readily withdrawn from the recess and to as readily snap into position in the recess. lt will now be understood that the, sleeve by means of the arm may be placed in such a position as to cause the :[lat sides 54 thereof to pass into and through the oppositely disposed parallel sides of the notch 45 and then also by means of the arm to be turned a partial revolution to cause the circular ends of the sleeve to engage with the circular base of the notch to maintain the parts in position in the plate, the parts being thus 'locked and held in place by the engagement of the pin in the recess provided therefor.` llt. will also be apparent that by the reverse operation the sleeve ind the spindle may be unlocked and removed from the p ate.

Adjacent the work holder end of the spindle there is a sleeve 60 similar to the sleeve 53. rlhis sleeve 60 is mounted on the spindle so as to turn and slide thereon and is provided with oppositely disposed -tlattened

sides

61 and 62, the distance between these sides being substantially the' same as the distance between the oppositely disposed par-- allel walls 49 of the notches 48. The ends of the sleeve 60 are made on the arc of a circle, the diameter of which is substantially the same as the diameter of the circularly disposed base wall defining the notches 48. The sleeve 60 is provided with a flange l 63 adapted to contact with the inner wall of the plate 40 and also .with a flange 64 adapted to contact with the outer tace of the wall 40. The flange 64 is provided with an arm 65', at the outer end of which there is a button 66 and a pin 67 which are precisely similar to the corresponding parts, namely the button 58 and the pin 59 of the corresponding members in the'sleeve 53. It follows, therefore, that the .work holder end of the Cil www@

spindle may be connected and locked in position in the plate 4U and also unlocked and disconnected therefrom at both ends of the spindle. l

llach work holder unit also comprises a cam shaft 68 which extends between and is journaled in bearings provided therefor in the

plates

39 and 40. Each cam shaft is provided with a suitably shaped cam 69 secured on the shaft b v a set screw 70 or otherwise for a purpose hereinafter described. On the outer side of the plate 39 the cam shaft 68 terminates in a head 71 to which there is connected a ratchet wheel 72. The ratchet wheel 72 may be connected to the head of the cam shaft by a set screw 73 or otherwise. A pawl 74 pivotally mounted at 75 in the disk 43 is adapted at its toothed end to engage with the. teeth of the ratchetwheel and is maintained in position against the ratchet wheel by a spring 76 which is connected to the disk by a screw '7 7 or otherwise. The free end of the spring 76 is pret'- erably hooked as indicated at 78 so as to be adapted to engage a notch 79 in the toothed end of the pawl in a position out of engagement with the teeth of the ratchet should this condition be necessary in the operation of the apparatus. For each work holder unit the disk 43 is provided with a slot 71 in which the head 71 of a corresponding cam shaft is placed, it being understood that this slot is circular and of sufficient extent to permit of a relative movement between the disk 43 and the plate 39. In a suitable position the disk 43 is also provided With a slot 80 through which projects a pin 81 which is fixed in and carried by the plate 39. One end of a spring 82 is suitably connected to the pin 81 and at its opposite end contacts with a pin 83 connected to and carried by the disk 43 so that normally through the action of the spring 82 the disk is maintained in a position relatively to the plate 39 in which the pawls are maintained in contact with the teeth of the ratchets.

Each work holder unit also includes a block 84 having a screw threaded stem 85 adapted to pass through an opening provided therefor in the plate 39 and to be secured in position in the plate by a nut 86 turned down on the stem into a recess in the outer face offthe plate. Pivotally connected to opposite sides of the block 84 are

links

87 and 88. The pivot screw by which these links are connected to the block is indicated at 89. Associated with the

links

87 and 88 and pivotally. connected to the opposite ends thereof are links 90 and 91.V The connected ends of these links are separated by a spacer block 92 carrying oppositely disposed trunnions 93 and 94 which pass through and are journaled in bearings provided therefor in the adjacent ends of the sets of links so as to pivotally connect these ends of the sets ct links which are maintained in position on the trunnions by means of nuts 95 and 96 turned down on the screw threaded reduced ends of the trunnions as is clearlyl indicated in Fig. 7 of the drawing. The spacer block 92 is adapted to receive an adjusting screw 97 which passes through the same and at its inner end is adapted to bear against the surface of the corresponding cam 69. At the opposite end of the adjusting screw the same is provided with a thumb disk 98 by means of which the adjusting screw may be set in any desired position relatively to the spacer block thereby determining the relationship between the inner end of the adjusting screw and the face of the cam. The outer extremity of the adjusting screw has swiveled thereto a leaf spring 99, also as indicated in Fig. 7 of the drawing, and this leaf spring 99 is adapted to contact normally with the adjacent surface of the corresponding spi-ndle 51 in order to normally maintain the links in position and the inner end of the adjusting screw in contact with the face of the cam. The leaf spring 99 furthermore is maintained in position by pins 100 which are fixed in and ex= tend from the block 84 and engage the op positely disposed edges of the leaf spring for this purpose.

Each work holder unit also includes a. clamp block 101, illustrated in Figs. 5 and 6 of the drawing, 'and adapted to be shifted to position and locked in place on the corresponding spindle 51. One end of the clamp block is slotted as indicated at 102 and provided with a clamp screw 1.03 which may be turned by a pin 104 passing through or suitably connected to the head 105 of the screw. At the opposite end of the clamp block the same is notched as indicated at 106. The outer portions of the notch are defined by beveled faces 107, at the inner end of which the notch is defined by substantially parallel oppositely disposed

walls

108 and 109, while the inner or base portion of the notch is defined by a circular-ly disposed wall indicated at 110.

The lower ends of the

links

90 and 91 are separated by a spacer 111. This spacer has oppositely disposed

fiat sides

112 and 113, the distance between which is substantially the same as the distance between the

faces

108 and 109 defining the notch in the end of the block 101. The ends of the spacer block 111 are made on the are of a circle, the diameter of which is substantially the same as the diameter of the circularly disposed wall forming the base of the notch. The spacer block 111 is provided with

trunnions

114 and 115 which pas: through and are journaled in bearings provided therefor at the lower or inner ends of the

links

90 and 91. These parts are maintained in position by

nuts

116 and 117 turned down on the screw threaded ends of the trunnions or otherwise. On the trunnion 115 exteriorly of the link 90 there is connected an arm 118. This issecured in position on the trunnion by the nut 117. The free end of the arm is tted with a button or handle 119 lying on the outer side thereof and a pin 120 lying on the inner side thereof, the pin being adapted to engage in a recess 121 provided therefor in the face of the clamp block 101. It will now be' apparent that with the clamp block 101 in position on the spindle 51 the spacer block 111 may be turned to the osition in which the flat sides thereof will pass through and between the oppositely disposed

parallel walls

108 and 109 of the notch at the end of the clamp block, and that then the arm 118 may be turned to cause the circular ends of the spacer block 111 to engage with the circular wall 110 to connect and lock the clamp block to the lower or inner ends of the

links

90 and 91. It will be equally obvious that by the reverse position these parts may be disconnected and when disconnected the corresponding spindle may be unlocked and disconnected from the

plates

39 and 40 so that the entire spindle and work holder may be removed to examine the condition of the work. It will also be understood that the arm 118 may be made sutlicientlyI resilient to permit the pin to ride over the face of the clamp block or the button and the F pin may be yieldingly mounted in the same so as to permit the pin to be withdrawn fromthe recess by the button and -to snap into place in the recess or back against the arm when released.

In order to ei'ect a relative movement between the disk 43 and the plate 39 to accomplish one of the purposes of the present invention, as will be hereinafter described, l may employ a suitable brake which, at predetermined times, contacts with the periphery of the disk to retard the same, it being understood that the work holder member continues to revolve so that it may be advanced revolubly in its relationship to the disk. While merely illustrative this may be accomplished by providing the arm 23 of the base with an extension 122 and employing an arm 123 connected to the extension by screws 124 or otherwise and fitted with a brake 125 which may be connected to the arm 123 by' screws 1 26 in such a position that at predetermined periodsfor example when the oscillating lever 30 completes each oscillation, the periphery of the disk will be brought against the brake to retard the movement thereof and to change the relative positions of the disk and the plate which will permit each pawl 74 to pass one or more teeth of the corresponding ratchet and when released the disk through the action of the spring 82 will be returned to its normal position relativelyto the plate and that this movement will cause the pawls toturn the ratchets a predetermined portion of a revolution thereby imparting a corresponding movement to the cams carried by the cam shafts in order to determine the time at which the work holder will b1- released to move the work from the surface of the lap member,

as will be set forth in the following de` seription of the operation of the apparatus.

ln the operation of the apparatus as hereinbefore described` it will be understood that the parts may be driven by any suitable mechanism so that the lap member 26/ that is .the distance between diametrically opposite work holders is equal approximately to the radial width of the face of the lap member plus the diameter of the centrally disposed recess 27 therein. Furthermore, that in order to compensate for the increase in the wear of the lap member at the peripheral portions thereof the oscillating movement imparted to the work carrier is faster at the end portions' of the swing than in the central portions thereof. These features, however, are made the subject matter of the application to which reference has also hereinbefore been made.v

ln the use of the apparatus the work indicated at 127 and which, for example, may

be a diamond or other precious stone to be cut and polished is placed in the work holder 52 in a suitable position with the spindle 5l and associated parts removed from the work carrier. The spindle is then placed in position in the notches in tbe

plates

39 and 40 by means of the

sleeves

53 and 60 being passed into the notches and turned to be locked in position therein by the

handles

58 and 66 and the

pins

59 and 67. In so doing, it will be undertsood that the spacer block 111 is similarly passed into and locked in the corresponding notch 106 by swinging the arm 118 and causing the pin 120 to engage in the recess provided therefor, the spindle 51 being revolubly mounted in the

sleeves

53 and 60 may be turned to adjust the work into the desired position relatively tothe face of the lap, and the spindle 51 being also movable longitudinally in the

sleeves

53 and 60 may be adjusted to the desired distance toward the face of the lap. The spindle 5l is then selOl) cured in the clamp block 1-01 by tightening the clamp screw 103. The cam shaft 68 may then or previously be adjusted to the desired position to determine the extent of the cut to be made in the surfacel of the object to be ground and also to release the spindle and automatically lift the same to move the work from the surface. of the lap. The adjusting' screw 97 is set in position relatively to the surface of the caln for the same purpose and is maintained with its end bearing against the face of the cam by means of the springs 99 which also maintain the

links

87 and 88 and 90 and 91 in that positioir Whether a straight line position or otherwise in which the spindle and the Work holder are maintained in such positions that the work is maintained in contact With the surface of the 1ap. As the grinding operation progresses the cam shaft68 is turned by having imparted thereto lntermittent partial revolutions by the relative movement between the disk 43 and the plate 39 lthrough the intervention of the ratchet and paWl devices and the spring S2 until the cam is turned suiiciently far to permit the end of the adjusting screw to pass over the angular surface 128 therein when, as Will be apparent, through the action of the springs 99 the toggle levers will be moved inwardly swinging on the trunnions 93 and 94 which lifts the clamp block 101 together with the spindle 51 and the work holder 52 to remove the Work 127 from the surface of the lap. Then if necessary, as Will also be understood, the spindle 51 may be unlocked and disconnected from the carrier member by the reverse operation of that he-reinbefore described by which these parts are connected to and locked in their positions relatively to the

plates

39 and 40 of the carrier member. The apparatus, therefore makes provision,

`ashereinlcefore stated, for revolubly adjusting the position of the Work relative-ly to the face of the lap; also makes provision for the adjustment of the Work to and from the face of the lap; makes provision for connecting and locking and unlocking and disconecting the Work holder from the Work carrier; makes provision for normally maintaining the Work in Contact With the tace of the lap for adjusting the extent of the cut or the grinding operation, and also for automaticallyreleasing the Work and moving the salne from the face of the lap When this predetermined cut has been Iliade.

I claim as my invention- 1. In a grinding and polishing machine, a lap member, a revoluble Work carrier hav ingl plates connected thereto, a spindle, a work holder connected to the spindle, and means associated with the spindle for engaging portions of the said plates to connect and disconnect the said spindle to and from the said plates. v

ing the said spindle to and from the saidVVV plates.

3. In a grinding and polishing machine, a lap member, a Work carrier comprising a revoluble hub and plates connected thereto, the said plates having peripheral notches therein, a. spindle, a work holder connected to the spindle, and means associated With the spindle for engaging the Walls of the said notches in the said plates to connect and disconnect the saidspindle to and from the said plates.

4. In a grinding and polishing machine, a lap member, a Work carrier comprising a revoluble hub and plates connected thereto, the said plates having peripheral notches therein, a spindle, a Work holder connected to the spindle, and means associated with the spindle for engaging the Walls of the said notches in the said plates for connecting and locking and unlocking and disconnecting the said spindle to and from the said plates.

5. In a grinding and polishing machine, a lap member, a Work carrier comprising a revoluble hub and substantially parallel plates connected thereto, the said plates havingl notches in corresponding positions in the peripheries thereof, each notch being defined by substantially parallel Walls and a circularly disposed base wall, a spindle, sleeves carried by the said spindle in which the said spindle is revoluble and movable longitudinally, the said sleeves being adapted to enter the said notches, and means for turning the said sleeves to engage the Walls deiining the said notches to connect and disconnect the same to and from the said plate.

6. In a grinding and polishing machine, a lap member, a Work carrier comprising a revoluble hub and substantially parallel plates connect-ed thereto, the said plates having notches in corresponding positions in the peripheries thereof, each notch being defined by substantially parallel Walls and a circularly disposed base Wall, a spindle, sleeves carried by thesaid spindle in which the said spindle is revoluble and movable longitudinally, the said sleeves being provided with oppositely disposed lat sides to enter the parallel walls defining portions of the said notches and having round edges to engage the circular Wall defining the base of the said notches, and arms associated With the said sleeves for turning the said sleeves in the said notches to connect and lock and unlock and disconnect the said spindle to and from the said plates.

'the workholder, and means for normally maintaining the links. in position relatively to the said work holder and to automatically swing the said links to move the work hol l er at a predetermined point in the operation of the apparatus.l

8. In a grinding and pohshing machine, a lap member, a work carrier, a spindle, a workV holder connected to the s indie,

spindle' and work holder to and from the work carrier, links pivotally connected ltogether and to the said work carrier, means for connecting and disconnecting the said links 'to and from the spindle, and means for normally maintaining the Vlinks in operative positions and swinging the same at predetermined points in the operation of the apparatus to shift the said spindle to move the work away from the grinding surface of the lap.

9. In a grindingwand polishing machine, a

, lap member, a work carrier, a spindle, a

work holder connected to the spindle. means for connecting and disconnecting the spindle to and from the said work carrier, sets of links pivotally connected to the said work carrier, a block for spacing and pivotally connecting the adjacent ends of the said links, an adjusting screw passing through the said block, means for pivotally connecting the opposite ends of the said links to the said spindle, and means for normally maintaining the said links in an operative position and automatically swinging the said links to shift the said spindle to move the work away from the grinding surface of the lap.

10. In a grinding and polishing machine, a lap member, a work carrier, a spindle, a work holder connected to the spindle, means for connecting and disconnecting the spindle to and from the said work carrier, sets of links pivotally connected to the said work carrier, a block for spacing and pivotally connecting the adjacent ends of the said links, .an adjusting screw passing through the said block, means for pivotally connecting the opposite ends of the said links to the said spind e, a cam, a spring coacting with the said adjusting screw for normally maintaining tlie links and the spindle in an operative position, and means for turning the cam to progressively advance the spindle to move the work toward the grinding surface of the lap and to automatically swing the links to shift the spindle in the opposite direction to move the work away from the grinding surface of the lap a predetermined point inA the operation of the apparatus I I. I

a block for spacing and awaits carrier, sets of links pivotally connectedfat corresponding ends in the said work carrier,-

the adjacent ends of the said links, an a justing screw passing through the said block, means .for pivotally .connecting the ,to the said spindle, a' caimshafltfjournaled inthe said plates, a cam carriedibyzthe pivotally connecting opgsite corresponding ends.. of-atheilisaid means for connecting and disconnecting the Vli s 0 said cam shaft, a spring coactingpwithjtlie said adjusting screw for normally maintain-A ing, the links in an operative` position,'the

end ofthe said adjusting` screw bein main-I tainedin contact with the :face of t e cam by the said spring, a disk mounted -extei'ioi-ly of one of said plates, and means for e'ecting a relative movement between the links, an adjusting screw passing through the said block, means for pivotally connecting the opposite corresponding ends of the said links to the said spindle, a cam shaft journaled in the said plates, a cam carried by the said cam shaft. a spring coacting with the said adjusting screw for normally maintaining the links in an operative position, the end of the said adjusting screw being maintained in contact with the face of the cam by the said spring, a disk mounted exteriorly of one of said plates, a ratchet secured to the outerend of the cam shaft, a pawl carried by the disk and adapted to engage the teeth of the ratchet, a brake for periodically engaging the disk to retard the movement of the same relatively to the said plate and then releasing the same, and a spring for then returning the disk to its normal position relatively to the plate to thereby impart a partial revolution to the cam shaft and cam through the said ratchet and pawl.

13. In a grinding andpolishing machine, a lap member, a work'carrier, a work holder, pivotally connected links, and means for normally maintaining4 the links in position relatively tothe said work holder and to autvnetically Swine fa@ ai@ te new the work holder at a pi edetermined point in the operation of the apparatus.

14.- In a grinding and polishing machine, a lap member, a work carrier, a spindle, a work holder connected to the spindle, links pivotally connected together and to the said work carrier, means for connecting and disconnecting the said links to and from the spindle, and means for normally maintaining the links in operative positions and swinging the saine at predetermined points in the operation of the apparatus to shift the said spindle to move the work away from the grinding surface of the lap.

15. In a grinding and polishing machine, a lap member, a work carrier, a spindle, a work holder connected to the spindle, sets of links pivotally connected to the said work carrier, a block for spacing and pivotally connecting the adjacent ends of the said links, anadjusting screw passing through the said block, means for pivotally connecting the opposite ends of the said links to the said spindle, and means for normally maintaining the said links in an operative posi-f" tion and automatically swinging the said links to shift "the said spindle to move the work away from the grinding surface of the la If. In a grinding and polishing machine, a lap member, a work carrier, a spindle, a work holder connected to the spindle, sets of links pivotally connected to the said work carrier, a block for spacing and pivotally connecting the adjacent ends of the said links, an adjusting screw passing through the said block, means for pivotally connecting the opposite ends of the said links to the said spindle, a cam, a spring coacting Awith the said adjusting screw for normally maintaining the links and the spindle in an operative position, and means for turning the cam to progressively advance the spindle to move the work toward the grinding surface of the lap and to automatically swing the links to shift the spindle in the opposite direction to move the work away from the grinding surface of the lap a predetermined point in the operation of the apparatus.

17. In a grinding and polishing machine, a lap member, a work carrier comprising a ievoluble hub and spaced plates connected thereto, a spindle, a work holder connected to the spindle, sets of links pivotally connected at corresponding ends in the said work carrier, a block for spacing and pivotally connecting the adjacent ends of the said links, an adjusting sciew passing through'the said block, means for pivotally connecting the opposite corresponding ends oftthe said links to the said spindle, a cam shaft journaled in the said plates, a cam carried by the said cam shaft, a spring coacting with the said adjusting screw for normally maintaining the links iii-an operative position, the end of the said adjusting screw being maintained in contactwith the face of the cam by the said spring, a disk mounted exteriorly of one of said plates, and means for effecting a relative movement between the said disk and the plate to intermittently impart a partial revolution to the said cam shaft and cam.

18. In a 'grinding and polishing machine, a lap member, a work carrier comprising a revoluble hub and spaced plates connected thereto, a spindle, a work holder connected to the spindle, sets of links pivotally connected at corres onding ends in the said work carrier, a li ock for spacing and pivotally connecting the adjacent ends of the said links, an adjusting screw passing through the said block, means for pivotally Connecting the opposite correspondingends of the said links to the said spindle, a cam shaft journaled in the said plates, a cam carried by the said cam shaft, a spring coacting witlrthe said adjusting screw for normally maintaining the links in an operative position, the end of the said adjusting screw being maintained in contact with the face of the cam by the said spring, a disk mounted exteriorly of one of said plates, a. ratchet secured to the outer end of the cam shaft, a pawl carried by the disk ano adapted to engage tlie teeth oi' the ratcliet,a brake for periodically engaging the disk to retard the movement of the same relatively to the said plate and then releasing the same, and a spring for then returning the disk to its nogrnial position relatively to the plate to thereby impart a partial revolution to the cani shaft and cam through the said ratchet and Dawl.

19. In a grinding and polishing machine, a lap memleer, a work carrier, a spindle, a work holder connected to the spindle, means for connecting and disconnecting the spindle and work holder to and from tliesaid work carrier. sets of links pivotally connected at adjacent ends. means for pivotally connecting one end of the said links to the said work cari-ier, means for connecting and discon'- necting the opposite end of the said links to the said spindle, and devices coacting with F the said links for normally maintaining the said spindle in an operative position and automatically swinging the said links to shift the spindle to move the` work away from the surface of the lap at a predetermined point in the operation of the apparatus.

20. In a grinding` and polishing machine, a lap member, a work carrier, a spindle, a work holder connected to the spindle, means for connecting and locking and unlocking and disconnecting the spindle and work holder to and from the said work carrier, sets of link pivotally connected at adjacent ends, means for pivotally connecting one end of the said links to the said work carrier,

ing the said links to shift the spindle to` move the work aw-ay from the surface of the lap at'a. predetermined point in the operation of the apparatus.

21. In a grinding and polishing machlne, a lap member, a Work carrier, a s lndle, a work holder connected to the spind e, means for connecting and disconnecting the spindle to and from the' saidwork carrier, a clamp block secured on the spindle, sets of links pivotally connected at their adjacent ends,

' means for pivotally connecting one end of the said links in the said Work carrier, means for connecting and disconnecting the opposite end of the said links tc the said clamp block, and meansassociated with the said links for maintaining the. same and the spindle in operative positions and for automatically swinging the said hnks to shlft the spindle and move the work from the surface of the lap a predetermined point in the operation of the appar-atus.

22.' In a grinding and polishing machine, a lap member, a work carrier, a spindle, a work holder connected to the spindle, means for connecting and disconnecting the spindle to and from the said work carrier, a clamp block secured on the spindle, sets of links pivotally connected at their adjacent ends, a. spacer sleeve pivotally mounted in the opposite end of the said links, one end of the said clamp block being adapted to be connected to and.' disconnected from'the said spacer sleeve at the end of the said links, and means associated with the said links and the spindle whereby the same are normally maintained in operative positions and the links are automatically swung to shift the spindle and move the Work from the face of the lap at a predetermined point in the operation of the apparatus.

23. In a grinding and polishing machlne,

'a lap member, a work carrier, a spindle, a

work holder connected to the spind e, means for connecting and disconnecting the spindle to and from the said work carrier,

' a clamp block secured on the spindle, sets of links pivotally connected at their adjacent ends, a spacer block to which the adjacent ends of the links are pivotally connected, one end of the said clamp block being adapted to be connected to and disconnected from the said spacer block at the end of the said links, an adjusting screw ass' ing through and'. ad'ustable inthe lock pivotall connecting .t e adjacent end of the said li s, a spring Carried by the said adjusting screw and adapted to bear against the sald spindle, a. cam a ainst the face of `which the end of the a justing ,screw is maintained by the action of the said spring which threby maintains the spindle and links in operative positions, and means for imparting intermittent partial rotations to the said cam to maintain the spindle in an operative position as the cut 1n the Work progresses and to release the links permitting the same to swing by the action of the sprlng at apredetermlned point in the. o eration of the apparatus to shift the spindlle and move the Work from the face of the lap.

24. In a machine of the class described or the like, a body member having a notch in the peripheral portion thereof, a s indle, and a collar revoluble on the spindle and adapted to enter the said notch to turn therein and to engage with the wall defining the said notch to ook the spindle to the body` member.

25. In a machine of the class described or the like, a body member having a notch in the peripheral surface thereof, the notch being defined by Walls having substantially straight parallel portions and a circular base portion, a spindle, a collar revoluble on the spindle and having attened sides and oircular ends adapted to enter the said notch to be turned therein and to engage the circular Wall at the base thereof to lock the spindle in position in the body member.

26. In a machine ofthe class described or the like, a plate, a, spindle adjustably mounted' in the said plate, toggle links, one set of which are pivotally connected to the said late, a spacer block pivotally connect ing t e adjacent ends of the said links, an adjusting screw mounted in the spacer block, means carried by the adjusting screw for yieldingly engaging the spindle, a cani against the face of which the adjusting screw is maintained by the aforesaid means, devices for connecting the other end's of the second set of links tothe spindle, and means for turning the cam to advance the spindle predetermined distances in one direction and tlen releasing the links to move the spindle in the opposite direction.

Signed by me this 20th day of J une, 1923.