US1677484A

US1677484A - Grinding apparatus

Info

Publication number: US1677484A
Authority: US
Publication date: 1928-07-17
Anticipated expiration: 1945-07-17

Description

J; A, MILLIKEN'` GRINDING APPARATUS Filed April 1v, 192s July 17, 1192s.

4 Sheets-Sheet l j @IW Xgl ATTORNEY.

July 17, 1928. v 1,677,484

J. A. MILLIKEN GRINDING APPARATUS Filed April 17, 1923 4 sheets-sheet 2 l ATTORNEY.

- July 11, 192s. I

1,677,484 J. A.- MILLIKEN GRINDING APPARATUS Filed April 17, 1925 4 sheets-sheet' 5 IN VEN TOR.

ATTURNEY.

July 17, 1928.

1,677,484 J. A. MILLIKEN GRINJING APPARATUS Filed April 17, 1925 4 Sheets-Sheet 4 Patented July 17, 1928.

UNITED STATES JOHN A. MILLIXEN, OF AMBLEIIB.,'1E:FINNSYLVAINIA,v ASSIGNOR TO JOHN E.

F PHILADELPHIA, PENNSYLVANIA.

PATENT OFFICE.

MARSDEN,

GRINDING APPARATUS.

Application filed April 17,

My invention relates to grinding apparatus and particularly to apparatus for cutting or ornamenting glass ware, such as drinking glasses, tumblers, and the like.

This a plication is in part a division of my app ication Serial Number 481,501, filed J une 30, 1921 and entitled Glass workin apparatus.

y invention has for its objects the provision of an improved and simplified form of apparatus for cutting or decorating glassware land the like and for holding the articles while being operated upon. y

One form of apparatus embodying my` in vention is shown in the accompanying drawing wherein:

Fig. 1 is a view, partially in section and partially in rear elevation, of a device embodying my invention.

Fig. 2 is a View, on an enlarged scale, of a portion of the apparatus shown in Fig. 1.

Fig. 3 is a view of the apparatus of Fig. 1, in side elevation.

Fig. 4 is a View partially in side elevation and partially in section of a portion of the apparatus shown in Fig. 1.

f ig. 5 is a horizontal sectional View, partially in plane, taken on the line 5-5 of Fig. 1.

Fig. 6 is a view, partially in plane and partially in section, taken on the line 6*(3 of Fig. l. j

Figs. 7 and 8 are top and bottom plan views, respectively, of the combined guard plate and gage device which I employ.

Fig. 9 is a view, partially in elevation and partially in section, of the chuck for holding a glass article. V

Fig. 10 is an enlarged detail view of a portion of the apparatus of Fig. 9.

Fig. 11 is a view taken. on the line 11-11 of Fig. 9.

Fig. 12 is an enlarged detail view of the gripping member of the chuck.

My invention is shown in the drawings as adapted for use in connection with a rotat able table, driving mechanism therefor, and stationary cam members, such as shown for example in my application for patent above referred to. In the present case, the movable `table or structure is represented at R, said table serving as a carrier for the mechanism to be hereinafter described. T represents a base, or other stationary member, provided 1923. Serial No. 632,749.

with cam members to be hereinafter described, and along which the table R moves.

It will be understood that instead of movingthe table R such member could be made stationary and the cam members moved relatively to the table R.

Secured upon the table R are the guides 27, by which are held the vertical standards 28 carrying the horizontal pivot shafts 29. Movably mounted on said shafts 29 are the cylindrical members 30 which are provided with upwardly extending standards or arms 31 carrying at their upper ends the sleeve members 32. Bearing sleeves 33 are supported by the members 32 and longitudinally adjustable with respect thereto, said sleeves supporting the bearings 34 for a rotary shaft 35, upon whose upper end is secured the cutter or grinding wheel 36. The shaft 35 is connected with a driving shaft 3S bymeans of a sleeve 37 and a set screw 37 so asto permit of relative longitudinal adjustment of said shaft 35 with respect to the driving shaft 38. Said driving shaft is actuated by Y the shaft 38, in turn driven through the universal joint 39, driven by the gear 40, in turn driven by the gear 41, said gears 41 being secured, respectively, upon the

sections

23 and 25 of a power shaft 21, through a universal joint 24. Y

Secured to or integral with each member 30 is alaterally extending arm 42 carrying at its end an adjusting screw 43 bearing upon the upper end of the adjustable abutment member 44 (Fig. 4) slidable vertically in the guide member 45 secured upon the table R. Vertically slidable in the member 45 is .the plunger or cam follower 46 in whose lower end 1s pivoted a roller 47 engaging cams 48 disposed in a circumferential series upon the stationarymember T. An adjusting screw 49 threaded in the member 44 (Fig. 4) abuts against the upper end of the member 46, rotation of the screw 49T serving to adjust the vertical throw of the member 44 by the cam 48.

Disposed between the two cutter structures of a pair is an arm 50 having a sleeve like guide portion 51. The arm 50 is carried by a member 76 (Fig. 6) carried on the table R.

The tumbler or other article G is supported by a chuck 53 that may be of any desired form, such for example as the form shown in Figs. 9 to l2 to be hereinafter de- Y scribed. A rod 58 extends into chuck body 53 and serves to operate the gripping meinbers (not shown) of the chuck to engage and release the article Gr.

The chuck is rotatably supported by the.Vv

,is a member 76 provided with pivot lugs 73 which movably engage the arms of a bifui-cated lever 74 (see Figures 4 and 6).

'Said lever is provided with a chuck operating portion and a lug 75. vThe ,member 76 also supports or carries the arm or bracket 50. The lug enters a sleeve 77 located beneath it on the table R and engages a cam follower 78 which is provided at its lower end with the roller positioned to engage a cam 80 carried by the table T. In operation, the follower 78 is moved upwardly by the cam 80 once during each Vrevolution of the table R thereby actuating the lever 74, which in turn moves the rod 58 upwardly to actua'te the chuck to free the article G. Said article may then be removed and ieplaced by'another, the holder or chuck gripping an article `as the roller 79 again passes off of the cain 80.

Y Pivoted to the member 51 at 81 is a bell crank lever having the

arms

82 and 83. Co-acting with the arm 83 is the plunger or cam follower y84 movable vertically in the sleeve 85 carried by the table R. The plunger 84 ,carries at its lower end a roller '86. adapted to ride upon cams 87 disposed in a circumferential series upon the stationary member T. When the roller 86 rolls up the cam 87, the plunger 84 isv raised, thereby rotating the bell crank lever upon its pivot 81 and causing the pawl 88 (Fig. 5) resilientl mounted in the lowerrend of the bell cran i arm 82, to step the aforesaid notched or indexing wheel 69 around one notch. The wheel 69 is locked after each actuation inl the position to which actuated, by a pin 0r dog 89 (Fig. 4), suitably mounted and biased by a spring or equivalent means to the locking position. Y

Referring to Figs. 1, 7 and 8, there is se* cured upon the upper end of each sleeve 33 a plate 9() having the arcuate upstanding y' member 91 partially surrounding the cutter wheel 36 las a guard or shield. Secured to and extending radially outward from the member 91 is a threaded rod 92 extended through a slotted lug 93 carried by a member 94, a spring 95 surrounding the rod 92 and disposed between the lug 93 and the inember 91. Threaded `upon the rod 92 is the Vthumb nut 96, which when turned causes radial movement of the member 94 to suitably adjust or position a stop 97 carried at edge of the plate 90. A spring 98 biases the cutters 36 into engagement with the .article Y G. The stop 97 serves to limit the movement of the cutter wheel 36 toward the arti-V cle G when such stop or depth gage member 97 eiigz'igijcs said article. i 1

The chuck which I Vemploy has its body portion 53 rotatably supported within the cylindrical bearing 51 of the arm 59 as above explained. A slee-Vedilie iiieinber52 is rigid! ly secured to the body 53 and serves asa shaft for support-ing the chuckwithin the bearing block 5l, the notchedwheel 69 being :secured two pairs of lugs 55 either pair of whichmay be engaged by the hook members 62, in the manner of a bayonet joint, the rotative movement of the tumbler G, when placed within the gripping member 57 being `limited by pins 63V and 64that serve as stop members, in the manner shown in Fig. 11. are rigidly secured to the member 57. The

pin 64 extends through a hole inthe bottom of the body 53, to prevent rotative niovement of the gripping member 57 with iespect to said body. y

The upper end of the chuck 4body 53 is These pins bevelled or cupped and provided 'with rub` ber pads 53a'riveted thereto, thesepads serving as seats forthe shoulder portion 56 of the tumbler G. v

A compression spring61 is inserted between the flange 60 of the sleeveshaft 52 and the collar 59, to normally bias the rod58 downwardly and hold the tumbler yieldingly against the seat members 53a. Upon en- Gagement of the cam roller 79 with the cam lio liig 80ers above explained, the lever 7() is raised, thus raising the rod 58 and gripping. member 57 to the position shown in Fig. 10,

againstthe compression of the spring 61,v thereby ii'ioving the tumbler G from its seat l the and permitting removal thereoffroin gripping member 57.

The operation of the apparatusl isas fol-` lows:

TWith the cutters or grinders 36 driven by v the shaft `21 as above explained, and the glass article (i supported inthe chuck 53, relativemovement,in a horizontal direction, is imparted tothe table R and the cam supporting member T.

A series of cam lugs 48, only onej of which is shown, are spacedV sufficiently apart that the period occupied by the table R in carrying the roller 47 from one to the other will be sufficient to enable the grinders 36 `to each make acut of the desired depth in the article G. Upon encountering a cam lug 48 the plunger 46 is raised to lift the arms 42 and thereby move the cutters out of engagement with the article being ground. At this stage, the roller 86 encounters a cam lug 87 thereby effecting movement of the lever S3 (Fig. 4) to impart a` slight rotative movement to the chuck 53 and present unground areas of the article G to the cutters 36. The roller 46 then passes out of engagement with the cam 48 and permits the grinders 3G to be moved into engagement with the article Gr by the spring 98. Stepped rotative movements as just described are imparted to the chuck 53 until it has made a complete revolution about its axis, the cutters 36 being moved out of engagement with said article during each step of rotative movement thereof. At. this time, and with two complete annular rows of circumferential cuts upon the article G, the

roller -79 `encounters a cam member S0, to effect upward movement of the arm and -the chucks controlling rod 58, to thereby permit removal of the article G and the insertion of another article in the chuck. At this period the roller 47 is raised by one of the cam members 48, toV hold the grinders 36 in retracted position.

It will be understood that vertical movements of the

plungers

84, 46 and 78 will be effected in any desired manner, it being necessary only that they be actuated in proper sequence to effect the desired rotative movementof the chuck, retractive and 'advanced movement of the grinders, and release of the article.

Various changes in detail and general arrangement may be made without departinglr from the spirit and scope of the invention as defined in the accompanying claims.

What I claim is:

l. A grinding apparatus of the character described comprising relatively spaced rotatable grinders, a rotatable work holder interposed between said grinders, a power shaft for actuating said grinders, and means whereby the grinders may be adjusted with respect to the power shaft and axially of said work shaft.

2. A grinding apparatus of the character described comprising rotatably mounted grinders, a work holder, a power shaft, and

nect-ion having means for maintaining its driving engagement with the power shaft during oscillation of the grinder.

4. A grinding apparatus of the character described comprising a grinder, a work holder, a power shaft, a driving connection between the holder and the power shaft, means for oscillating the grinder toward and from the work holder, means for maintaining driving connection with the power shaft during oscillation of the grinder, `and means whereby the grinder may be adjusted with respect to the power shaft and axially with respect to the Work holder.

A grinding apparatus of the character described comprising a work holder, a Slidable support movable toward and from said work holder, a grinder carrier pivotally mounted on said support, and means for periodically oscillating said grinder carrier on its pivot. Y

(5; A grinding apparatus of the character described comprising a work holder, a pair of spaced apart slidably mounted supports capable of relative adjustment with respect to the work holder and to each other, grinder carriers pivotally mounted on the respective supports, and means for periodically oscillating said carriers in unison upon their respective pivots.

A grinding apparatus of t-he character described comprising a work holder, a slidable support movable toward and from said work holder, a grinder carrier pivotally mounted on said support, a grinder rotatabl mounted on said carrier, means for period) ically oscillating said grinder carrier on its pivot, a power shaft having a driving connection with said grinder, and means maintaining said driving connection irrespective of the position of said slidable support.

8. A grinding apparatus of the character described comprising a work holder, a slidable support movable toward and from said work holder, a grinder carrier pivotally mounted on said support, a. grinder rotatably mounted von said carrier, means for periodically oscillating said grinder carrier on its pivot, a power shaft having a driving connection with said grinder, said driving connection including means for maintaining its engagement with said drive shaft irrespective of the position of said slidable support, and means maintaining said driving connection during oscillation of said grinder carrier.

9. A grinding apparatus of the character described comprising a work holder, a slidable support movable toward and from said work holder, a grinder pivotally mounted on said support, means for periodically oscillating said grinder upon its pivot toward ,and from said work holder, a power shaft having a driving connection with said lll() grinder, and means'maintaining said driving connection irrespective of the position Y, of said slidable support.

10. A grinding apparatus of the character described comprising a work holder, a slidable support movable toward and from said Work holder, a grinder pivotally mounted onV said support means for periodically oscillating said grinder on its pivot l means for adjusting onejoi" said grinders parallel of its aXis and independently of the ladjustment of `said supports. i

V12. Grinding apparatus comprising a work holder, pivoted supports, a rotary cutter carried by each of said supports, a spring biasingV said supports toward each other vand toward said work holder, means Vfor imparting step-by-step movements to said holder, and means for actuating said supports to move tliecutters away from said holder in opposition to said spring during said movements of the holder. Y

13. A grinding apparatus of the character described comprising a pair of pivoted supports, each provided ywith a cutting tool,

a 'Work holder, an actuating member for.

periodically oscillating the supports to move the cutting tool toward and from the Vwork holder, adjusting means interposed Vbetweeny the actuating member and the supports to llimit said oscillating movement, and gages carried by the respective supports, said gages being positioned to engage an artic-le carried by the work holder toV limit lthe depth of the cuts made by said tools. f e

`14. Grinding 'apparatus' comprising aj pair of pivoted supports, cutting tools mountedV on said supports, a work holder disposed between said tools, means for oscillating saidrsupports to move said tools toward and away from Said Work holder, means ior adjusting the operative relation of said last-named meanspand Said support, and an adjustable gage device mounted Vupon each of said supports in position to engage an article carried by said Work holder, to limit the depth to which the article will be cut by said tools. y

15. Grinding apparatus comprising a pair of pivote/d supports, a cutting tool carapparatus comprising a' ried by each ofz said supports, awork holder disposed between said cuttingv tools, a crank arm' carried by cach of said supports, a mov'- able member engaging said crank arms to oscillate said supports and move said tools Vtoward andaway from said work holder,

an adjusting device lor positioning said arms withrespect to said movableV member p to limit the movementof said supports relative to said work holder, and a gage device carried by each of said supports in-position to engage an article carried byy said work holder. to limit the depth of cuts to bemade by said tools. ,v

1G. Grinding apparatus comprising .a pair of pivoted supports, a cutting tool carried by each of said supports, a work holder disposed between said cutting tools, means lfor oscillating said supports to cause saidtools to move toward andaway from.v

sad'worl; holder, and an adjustable connection between said supports and` said means or holding said tools in spaced relation to said work holder Va-l'tcrv an article has beenV removed Afrom said holder.

17. Grinding apparatus comprising a pivoted' support, a cutting tool carried yby said support, a work holder Vmounted in position to be engaged by saidcutting tool, yplunger for oscillating said support,and an adjustable connection between said plunger and said support adapted to serve as a stop member for limiting the movement of said` cutting tool toward said lwork holder after an article has been removed from said holder.`

18. Grinding apparatus comprising a pivoted support, a cutting tool carried by said support, a work holder mounted in position to be engaged by said cutting tool, means for oscillating said support, an adjustable connection between saidmeans andisaid support adapted to serve as a stop member to.

limit the movement of said cutting tool towai'd said work holder after an article has been removed from said holder, and a gage device carried by said support in position to engage an article held by said holder tolimit the depth of cut therein made be said tool.

19. Grinding apparatus comprising a pivotally mounted support, a cutting tool car-` ried thereby, a Work holder mounted in position to `coi-operate with said cutting tool, means for oscillating said support, means independent of said work holder for limiting the movement of said support toward said.

sonV

holder, and means for-engaging an article Y carried by said holder to limit the depth of cut made by said tool.

20. Grindingl apparatus comprising a pivlotally mounted support, a cuttingtool carv ried thereby, a work holder mounted in position to co-operate with said cutting tool, -Y

means for oscillating said support, means in-l dependent of said Work holder for limiting the movement of said support toward said,

holder, means for engaging an article carried by said holder to limit the depth of cut made by said tool, and means for shifting the pivot point of said support toward and away from said work holders.

21. Grinding apparatus comprising a pivoted support, a cutting tool carried by said support, a work holder mounted in position to co-operate with said cutting tool, means for oscillating said support about its pivot and means for shifting the pivot point of said support toward and away from said work holder.

22. Grinding apparatus comprising a table, a grinder support pivotally mounted upon said table for oscillation in a plane at right angles to the plane of said table, a rotatable work holder supported by said table, a reciprocatory member for rotating said work holder about its axis, reciprocable members disposed vertically of the table and respectively engaging said grinder support and said reciprocable member, and means for operating said vertical members in predetermined relation.

23. Grinding apparatus comprising a table, a grinder pivotally supported by said table, a Work holder-supported by said table, means for rotating said work holder about its axis, releasing mechanism for disengaging an article from said holder, reciprocable disposed vertically of the table and respectively associated with said grinder support, rotating means and releasing mechanism, and means for operating said reciprocable members-in predetermined relation to effect the cutting of a pattern circumferentially of the article, to move the cutter out of engagement with the article, and to actuate said releasing mechanism.

24. Grinding apparatus comprising a table, a work holder, a grinder movable relatively to said holder, means for rotating said holder, and members reciprocable vertically of the table for respectively shifting the axialangularity of said holder, rotating said holder about its axis, and moving said grinder. f

25. In a grinding apparatus, the combination with a grinding wheel, of aguard member therefor, a movable depth gage extending diametricall across one :tace of said guard member, an adjusting means for imparting rectilinear movement to said gage.

26. In a grinding apparatus, the combination with agrinding wheel, of a guard member therefor, said guard member having a curved portion concentric with and partially encircling said grinding wheel, `a movable depth gage extending diamet-rically across said guard member, and adjusting means cooperating with said curved portion for moving said gage. v

v27. In a grinding apparatus, the combination with a grinding wheel, of a guard member therefor having a rearwardly extended projection, a movable depth'gage extending diametrically across one face of said gage member, and means cooperating with said projection for moving said gage.

28. In a grinding apparatus, the combination with` a grinding Wheel,'of a guard member therefor, said guard member having a curved portion concentric with and artially encircling the grinding wheel, sait? curved portion having a rearwardly extended projection, a movable depth gage having a lug engaging said'projection, and means cooperating with said lug and said projection for moving said gage.

29. In a grinding apparatus, the combination with a grinding Wheel, of a guard member having an abutment provided with a rearwardly extended threaded projection, a movable depth gauge having a lug engaging said projection, a spring interposed between said lug, and a contiguous portion of said guard member, and an adjusting nut engaging said threaded projection and bearing against said lug.

30. A chuck for an article of glass having an extension provided with a seating surface and with a circumferentially incomplete lug, comprising a body portion, a seat a grippin member movable axially of said body, an a circumferentially incomplete lug on said gripping member for engaging the rear side of said first named lug to hold said article against said seatl 31. A chuck for an article of glass having anl extensionV provided with a seating surface and with a circumferentiall'y incomplete lug, comprising a body portion, a seat, a gripping member movable axially of said body, a circumferentially incomplete lug on said gri ping member for engaging the rear side o said first named lug when said article-is moved against said gripping member and turned about its axis, and stop members for limiting the said turning movement.

32. A chuck for an article of glass having an extension rovided with a seating'surface and wit a lurality of circumferentially incomplete ugs, comprising a body portion, a seat, a grippin member movable axially of said bod a p urality of circumferentially incomp ete lugs on said ripping member for engaging the rear side of said first named lug when said article is moved against gripping member and turned about its axis, and stop members for limiting the said turning movement.

33. A chuck comprising a body having a seating surface adapted to engage an external surface of an article intermediate the ends thereof, a gripping member movable vaxially of said body and adapted to engage the article to hold it against said seat, and

' means for 'preventing rotative ymovement of said gripping member'vvithy respectlto said body in one direction. l 34. Apparatus for operating on an article of glass having a seating surface and a lug,

com arisin achuck bod a seatv lioldino1 7 5 C structure movablev axiallyof said body, andv a lug rigidly secured to said structure andadapted to engage the lug of said article to hold the article against saidj seat. 35. 'A chuck comprising a body portion having a seating surface, a gripping member movable axially thereof andl having a circumferentially incomplete lug provided with."v a circumferentially disposedV openended slot to effect a releasable connection with an article of complementary form, and means for ymoving` said gripping member axially `vto hold the article against said seat.

36. A chunk for liolding'an article provided with circumferentially Aspaced lugs and with a seating surface disposed circumferentially thereof, comprising a body mem# bei', a' seaton said Vbody member for said seating surface, 'a gripping memberjmovable axially of saidV body, and lugs on said gripping 'member for engaging the lugs on said article to hold said article against said seat. 37QA chuck for holding an article provided with circumferentially spaced lugs and with a seating surface disposed circumferentially thereof, comprising a body niember, a seat on said body member for said seating surface, a gripping member movable Aaxially ofjsaid body, and lugs on said gripping member for engaging the lugs onsaid article, and'means for biasin'gsaid gripping memberin a direction to yieldingly hold said article against said seat. i'

adapted to'engage the rear sides of said first named lugs, and means formoving the said gripping'member axially of said body to Vy.control the position of said article With respect to said seat. Y

39. A Vholder foranarticle provided vvith Vandextension having a lugandwitli Ya seating surface, comprising a chuck body,fa` seat for said seating surface, ra gripping member `prolvide'dcWith an over-hanging lug adapted to lengage the rear side of said first named lug When said extension is Vmoved into engage- V.ment with said gripping member and rotated to bringsaid lugs opposite one another, `and means for imparting relative .movement to V)said gripping member and said yseat to control the position offsaid articleivith respect to' said seat., y y y Y 40'." A holder for an article providedlvvith an extension having a lug and With a seating vseat to control the '38. A holder for an article provided circumferentially Vspaced, lugsj andl with a surface, comprising a lchuck body, a seatfor said seating surface, a gripping member provided with an overklianging lug adapted another, and means for imparting Vrelative movement to said gripping member and said with respect to sai seat, the said seating surface land extension of said article beingspaced .axially thereof.

4l. A' holder for Aain article provided with V cireurnferentially spaced Vlugs and With'a circumferentially disposed seating surface,`

comprising a `chuck body rovided with a seat for said seating sur ace, a gripping memberprovided with over-hanging lugs adapted toengage the rear sides of said firstV named lugs, and meansfor moving the said gripping member axially of' said body control .thev position of said article with res: fet to'said seat, the said seating surface l and of said article being spaced axially thereof. Y f c s 42. A holder foran article provided with ci cumfeifentially rspaced lugs and With a iiferentially disposed seating surface, comprising a chuck body pro'videiil with a Cposition of said .article .scat for said seating surfacefa gripping member provided with overlianging lugs adapted to engage the rear sides of said first named lugs, and means formoving the said gripping iii'einberaxially of said bodyfto control the pesitionof saidarticle with respect to saii'irseat, the saidseating: surface being'lecateil at a position intermediate the bottom of said article and the said lugs.

4:8. A chuck coi'nprisinga body portion having a seating suii'face,.a gripping member movable axially thereof and having its'pfr'ont end of a foriii'adapted Vto eifect a bayonet joint connection with an article Y compleii'ic'iital thereto, and means for moving said alibris. Y ist seat,

cliuclr comprisinga portion provided with Va seat, a gripping member movable axially thereof and adaptedV v to engage an article to hold it against-the said seat, and means for preventing Vrotative movementof said gripping member with respect tosaid body. y

4:5. Acliuck comprising a seat, ayieldable article-engaging surface on 'said seat, and means for holding. an article. in position against saidsurface 46. A 'chuck comprising a seat, resilient pads on said seat, and means forV holding an article in position against said padel,V

47. A chuck comprisinga seat, circumferentially. spaced pads von said seat, and

means for'liolding an articleV in position.

against said pads.

,1; member axially to hold said article rotatable body Y 48. Grinding apparatus comprising a pair of pivoted supports, a cutting tool carried by each of said supports, a work holder mounted in position to co-operate with said cutting tools, means for oscillatinr said sup ports, and an adjustable connection between each of said sup orts and said means for independently adjusting said supports.

49. Grinding apparatus comprising a pair of pivoted supports, a cutting tool carried by each of said supports, a work holder mounted in position to co-operate with said tools, means for oscillating said supports to cause said tools to move toward and away from said work holder, and an adjustable connection between said supports and said means for simultaneously adjusting said tools with respect to said work holder.

50. Grinding apparatus comprising a pair of pivoted supports, a cutting tool carried by each of said supports, a work holder mounted in position to co-operate with said tools, means for oscillating said supports to cause said tools to move toward and away from said work holder, and adjustable connections between said supports and said means for, respectively, independently and simultaneously adjusting said tools with respect to said means.

51. Grinding apparatus comprising a pair of pivoted supports, a rotatable cutting tool carried by each of said supports, a work holder mounted in position to co-operate with said tols, means for oscillating said supports to cause said tools to move toward and away from said work holder, adjustable connections between said supports and said means for independently adjusting said supports, and means for independently adjustmg said cutting tools longitudinally of their axes.

52. Grinding apparatus comprising a rotatable shaft, a cutting tool mounted thereon, an oscillatory support for said shaft, a driving member for said shaft, mounted independently of said support, and a universal of said shafts, an oscillatory support for each of said shafts, a common driving shaft for said first named shafts, and a universal joint between said driving shaft and each of said rst named shafts. j

54. Grinding apparatus comprising a rotatable cutter, a rotatable holder Whose axis is inclined with respect to the axis of said cutter, an oscillatory support for said cutter, an arm secured to said support, and means for actuating said arms to oscillate said support.

55. Grinding apparatus comprising a pair of oscillatory supports, a rotatable cutter mounted upon cach of said supports, a work holder disposed between said supports and having its axis inclined with respect to the axes of saidvcutters, an arm carried by each of said supports, and means for actuating said arms to oscillate said supports.

56. The combination with a grinding too-l, of a work holder mounted in position to cooperate therewith, a support for said work holder, and means for rotating said work holder in said support, comprising a pawl pivoted upon said support, artoothed member secured to said work holder, and means for oscillating said pawl to impart a rotative movement to said toothed member.

57. A chuck comprising a supporting member, a holding device rotatably mount-ed in said supporting member, a toothed member carried by said holding device, a pawl pivot-ally mounted upon said supporting member, and means for oscillating said pawl toy impart relative movement to said toothed member.

58. A chuck structure comprising a supporting member, a holding device rotatably supported in said supporting member, and provided with teeth, and a bell crank pivotally mounted upon said supporting member, one arm of said crank being adapted to engage said teeth and the other arm thereof serving as an actuating lever.

In testimony whereof, I have hereunto affixed my signature this 9th day of April,

JOHN A. MILLIKEN.