US828885A

US828885A - Grinding and polishing machine.

Info

Publication number: US828885A
Application number: US23341304A
Authority: US
Inventors: Christian C Hill
Original assignee: CLOTHILDE B HILL
Current assignee: CLOTHILDE B HILL
Priority date: 1904-11-19
Filing date: 1904-11-19
Publication date: 1906-08-21
Anticipated expiration: 1923-08-21

Description

No. 828,885. PATENTED AUG. 21, 1906.

G. G. HILL.

GRINDING AND POLISHING MACHINE.

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.I 7 A 7 i r n E I E llllllmllllly 5 a 1 1 25:; a 6 aizigiailu 3 No- 828,885.- PATENTED AUG. 21, 1906. G. G. HILL.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED NOV. 19. 1904.

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No. 828,885. I PATENTED AUG. 21, 1906.

' G. G. HILL.

GRINDING AND POLISHING MACHINE.

APPLIOATION FILED NOV. 19. 1904.

4 SHEETSSHEET 3 ml 1 lllllmllllllw 'PATENTED AUG. 21, 1906.

0. G. HILL. V GRINDING AND POLISHING MACHINE.

APPLICATION FILED NOV. 19. 1904.

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CHRISTIAN t. HILL, or oH c'A'jeo; r 'nmois, isslenoaroonoruitnn B.- HILL, OFCHICAGQ ILLINOIS.

GRINDI G AND Po rsHmeHMAcHINE.

I flpecifioationfof Iletters Patent.

Iatented Aug. 21, 1906.

Applioation'flled November 19', 1904. Serial 1165233313.

To all whom it may concern: I l

Be it known that I, CHRISTIAN C. HILL, a

V citizen of the UnitedStates of America, and

a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new -and useful Improvements in Grinding and Polishing Machines, ofwhich the following is a specification.

. p'able of ready and accurate adjustment to produce a lens or other like any required degree of convexity or con- "taryhorizontal section at line at a, Fig. 4is a plan view of the 'machine. Fig. 5

cavity and which is especially adapted to produce any required form of what is known to optometrists as the toric lens, all as will hereinafter more fully appear.

In the accompan drawings, Figure 1 is a front elevation 0 a grinding and polishing machine embodying the present invention. Fig. 2 is a fragmentary vertical section of the same at line a: 0:, Fig. 1.

is a fragmentary horizontal section at line a? Fig. 1. Fig. 6 is a similar view at line at :0 Fig. 1. Fig. 7 is an enlarged detail sectional elevation at line .00 as, Fig. 8, of the lens grinding or polishing and the lens-holding heads and their immediate connections. Fig. 8 is an end elevation of the same. Fig. 9 is a bottom view of the lenscarrying plate. Fig. 10 is a longitudinal section of. the same at line a Fig. 9. Fig. 11 is an enlarged detail sectional elevation showing the parts in a reversed arrangement to that shown in Figs. 7 and 8; Fig. .12, adiagrammatic view showing the path of movement of one grinding member to the other. Fig. 13 is a'perspeotive view of the machine, illustrating the general arrangement of the parts.

Similar numerals of reference indicate like parts in the several views.

Referring to the drawings, 1 is the supporting frame or base of the machine, and 2 a supporting post or upright secured thereto and forming a support for the journal-brackets, which pivotally support the radius-links of the grinding and polishing headshereinafter described. 3 and 4 represent a pair of substantially counterpart journal-brackets surface having Fig. 3 is a fragmen- Fig. 2/. l

the radius-links arranged, in an lar relation to each other, as shown, and ma e vertically adjustable upon 1 the sides'of upright 1 in any usual and suitable m'anner. The particular construction shown in the drawings as illustrative of the adjustable connection of the journalbrackets to'said post involves a construction as follows:

5v represents vertical undercut guide groives formed in the vertical post aforesai 6 represents clampingbolts, the headed inner ends of which are adapted for engagement in the guide-grooves aforesaid.

7 represents clamping-nuts screwin upon the outer ends of said bolts and a apted' to clamp the respective journal-brackets,

against the vertical post 1 at the required vertical adjustment of suchbrackets.

8 represents adj listing-rods arranged vertically 1n the undercut grooves 5 aforesaid.

The up or ends of such rods are screwthreaded adjusting-nuts hereinafter escribed, while their lower portions are side ted for free vertical movement invertica orifices formed therefor in the headed inner ends of the clamping-boltsfi, as illustrated in Figs. 2 and 3.

for operative engagiement with the 9 represents set-screws which screw axi ally throu h thebolts 6 and.are adapted tobind the a justing-rods 8 in, the aforesaid orifices in-the bolts 6 to effect a fixed engagement between said rods and said bolts. 4

10 re resents adjusting-nuts enga ingthe screw-t readed upper ends of the a justingrods 8 andhaving abutment upon the top surface of the main post or upright 1. The

said adjusting-nuts in connection with the I adjusting-rods and set-screws aforesaid constitute precision adjustments for the journal- ;brackets, which in the construction shown are manually movedto approximately the required position, and after the engagement of the brackets with the adj usting-rods above set forth the final and precision adjustments are effected by the rotation of theadjustingnuts 10. When so desired, scales or indexes may be provided upon the vertical faces of the post or upright 1 for the guidance of the operator in effecting the aforesaid adjustments of the journal-

brackets

11 and 12 are substantially counterpart oscillatory holdin heads or sleeves .in which iereinafter described are ad- ICC justably held; Such sleeves or heads are ournaled horizontally and I in angular rela tion to each other by means of horizontal 8.1:

bors

13 and 14, fitti bearing-sleeves on the journal-brackets, as s own more particularly.

in Figs. 1 and 4.

15 and 16 are set-screws passing axially.

thr'oufghthe arbors

13 and 14 for-'cl'am the a oresaid-radius-bars at the require ad justment in the holding heads or sleeves afore said.

17 and 18 represent a pair of substantially counterpart ra aforesaid and free to oscillate upon thejouinal-axis ofsaid sleeves in paths at substantially right angles to each other.

19 and 20 are horizontal members on the lower ends of the radius-bars for the-sup ort of the respective nding or polishingan the lens or work'ho ding heads of the present construction, as hereinafter more fully set forth.

- 21 is the grinding or polishi head, and 22. the lens or Work carrying head, oth of which various sizes of such heads may be used, :but-

more especially with a view to a reversal of such heads in cha 'ng the operation of the machine from a pro notion of convex surfaces to the production of-concave Surfaces, and vice versa. In thefirst instance the lens or work holding head will be superimposed above the 'nding or polishing head, as illustrated in igs. 1, 7, and 8, wlnle in the other instance the grinding or polishing head will be superimposed above the lens or work holding head, as illustrated in Fig. 1 1

23 is. a sliding bar secured to the side of the horizontal member 19 and provided with a handled cam 24, by which its forward end is forced against the side of the supporting-shank o the'head 21 to hold the same in an open-sided holding-rec formed for the same in the side of said horizontal member, as shown in Figs. 1 and 6, the construction be-.

ing;,adapt.ed to permit a ready removal and replacement of such head, as required.

25 is a clamping-screw through'one branch of the yoke-sha e forward end of the upper horizontal mem er 20 and adapted to engage against one side of the shank of the lens or work holding head to hold the same in an o en-sided'recess formed in .the holding bloc hereinafter described, the arrangement being adapted to permit a ready removal and replacement of such head, as required.

26 is a holding-block, above referred to, pivotally connected b a horizontal bolt 27 to the other branch 0 the yoke-shaped for- Ward end of the member 20 aforesa1d,so as to be capable. of a pivotal adjustment in a us-bars adjustable in a vert1- cal direction in the holding heads or sleeves vertical plane and carrying with it in its aid- .justment the lens or work holding head 22 sozthat the. surface of the lens operated upon will be ground away more to one end than the other, and thus meet a requirement of he quent occurrence in spectacle-lenses, where,

owing to efective muscular convergence,'it

. is desira le-to give a prismatic form'to the lenses.

'28 is a vertical sector-shaped scale carried by the horizontal member 20 for convenience in effecting the above-described adjustment of the lens or work holding head.

29 is-a horizontal segmental scale carried by the holding-block 26 in concentric relation to; the axis of, the lens or work holding head, and 30 is an index-arm carried by the shank of the head 22.. The arran ement of the parts is such that the lens orwor .holding head 22 is capable of a pivotal adjustment in a horizontal plane, so as to adapt the principal meridian ofa toric s ectacle-lens to a particular'astigmatic con ition of the eyes.

31 is the lensholding plate, which in the present invention is formed with dovetail side edges adapted for engagement in correspondingly-formed recesses in. the opposed faces of a pair of depending cheeks32 on the holding-head 22 aforesaid.

transverse bar 34 for the, pu ose of drawing the cheeks 32 together an clamping the same upon the dovetail edges of the lensholding plate aforesaid.

35 is a raised bearing-rid e upon the under surface of the said lens-holding plate, preferably of the circular form shown in Fig. 9 and against which the back of the lens or other piece of work operated upon has'abutment to insure its correctalinement while the cement or-like securing Indium is being fused inthe operation of cementing the lens to the lensholding plate.

36 is an outer ridge upon the undersurfac of the lens-holding plate, preferably of an elliptical shape corresponding with the elliptical form of a spectacle-lens and acting as a marginal guide in setting and cementing such lens in place... 1-H r.

-37 is an annular gallery surrounding the din or polishing head 21 and having a d lied cm and a marginal upturned rim adapting it to contain the grinding or polishing material and tosup ly the same to the active grinding or lis gsurfaces, as required in the norma movement or operation of the same. In the present improvement such gallery is formed of elastic india-rubber or like material adapting it for ready removal 33 represents screws passing through the cheeks 32 and screwinginto'a.

1% and at are stationary guides on the main frame. 1 having engagement with the lower ends of the respective radius-

bars

17 and 18 to prevent lateral swaying of the same in actual use and maintain the same in their pro or and respective rectilinear paths.

41 an 42ers pairs of shaftsjourna ed at right anglestoieach other on the supporting base or frame 1 and geared together by bevelgears 43 and 4d, and a material part of the present invention consists in forming one of said bevel-gears with a less number of teeth than the otherin order that a differential degree of rotation of said shafts will prevail and in that it has been found from extended pracf tical experiment with such provision in conoperation of the parts e nection-with the oscillating movements of the respective heads 21 and22, as heretofore described, that a constant change in the point of n'din or olishing contact takes place angllhat'a in ex tended eriod g time in the:

apses be ore the same s ot'is again reached. Fig. 12 a graphic' illustration is given of the change. ohsuch grinding or polishing spot, as formed by a ,2. encil or marker carried by the upper hea 21 upon a sheetof 'aper' carried by thelower head 22, the num er of the teeth in the bevel- ,gears 43 and 44 being twenty-four and twenty-five, respectively;

. l and 46' are counte art crank-disks carried by'the shafts 41 an 42'aforesaid.

47 and 48 are adjustable wrist-pins carried by said crank-disks and-having pitman con dius-

bars

11 and 18; as illustrate in Figs, 1,

nections 4:9 and 50 with the res ective rai, 5, and 6. By theindependent adjustment of said wrist-pins the grindin or polishing zone is'changed in either directlon to suit the various widths, as well as lengths, of s ecta cle and like lenses operated'upon, an such" -adjustment's are of practical value, in that speedier effects can be obtained with the os cillations of the respective heads circum tion to the other as the grinding operation progresses. Y

- in the-:0 eration of the present invention the 'journa-brackets are-initially "adjusted u en the vertical post or'upr" ht of the mac e by the adjusting means eretofore described and so that the active Jgrindingor polishin surface of the respective heads carried at .t e lower. ends oftheradius-bars E oscillate in arcs of the radius of the lens'to he ground.

in the case of a spherical. convex orconcave lens such adjustments of the journalbrackets will be at a uniform height, while in the case of a toric lens the adjustment of said journal-brackets will vary to suit the two different curves of .thetwo meridians-toi such lens. a With the adjustment of the Journal-break. ets as above described the mechanism is {set in motion, the grinding-or polishing material.

mixed with water or other fiuidbemg-fed by hand to the 'gallery37 of the lowermost of the lens-forming heads and by. such gallery supplied to the active grinding-surfaces of the heads, as re uired.

, Having thus fully described my said in-' vention, what I claim as'new, and, desire to. I

secure by Letters Patent, is-

' l. in a grinding or polishing machine, the combination of a support, journal-brackets attached to said supp.ort,""a pair of radiusbars oscillating on said brackets in verticalv planes transverse to each other, a grinding or polishinghead arranged atthe lower "end of one of said radius-bars, an opposed workcar rying head arranged'at the lower end of the otherradius-bar, and means for imparting oscillatory movements to said radius-bars,

2, In a grinding orpolishingmachine, the combination of a support, journalbrackets attached to said support, a pair of radiusbars oscillating on said brackets in vertical planes transverse t'o'each'other, a grinding or polishing head arrangedat thelower end of rying head arranged at'the lower end of the other radius-bar, and means for imparting differential oscillatory movements to said radius-bars.

3. In a grinding or polishing machine, the combination of a support, journal-brackets attached to said support, a pair of radiusbars oscillating'on' said brackets in vertical planes transverse to each other, "a grinding or polishing head arranged at'the lower end of one of said radius-bars, an opposed work-can rying head arranged at the lower end of the other radius oar, and means for imparting one of said radius-bars, an'opposed work-carits oscillatory movements'to said radius-bars,

the same comprising a pair of driving-shafts, gear connections between said shafts, and means for transforming the rotary motion of said shafts into oscillatory-motions of the respective radius-bars.

f4. In a grinding or polishing machine, the

bars oscillating on sa'id'brackets in vertical planes'transverse to each other, a grinding or polishing head arranged atthe'lower end of one of said radius-bars,fan opposed work-fear rying head' arranged at the lower end of the other radius-bar, and means for imparting:

cpmbination of a support, journal-brackets attached to said support, a pair of radiusdifierential -oscillatory movements: to saidradius-bars, the same comprising a pair of driving-shatte gear connections between said shafts having a difierent :number of teeth, and -means for transforming the r tary motien of said shaft's into oscillatory motions of the respective radius+bars.:

' 5. Inagrind-i-ngor polishing machine, the combination of a support, journal brackets' attachedto-saidsuppnrt, a pair of radiusbars oseillating on said brackets :in vertical planestransverse to each other, a grindingor polishing head arrangedat the lower end: :of one I of said-radius bars, an-opposed-work+car+ rying head arranged at the lower end of the other radius bar, and meansfor imparting oscillatory movements to a said radius-bars, the same'comprisi'ng a pairof driving-shafts, gear connectionsbetween said shafts, crankdisks on said shafts, wrist-pins on said disks, and pitman connections-betw een said wristpins and the-respective -radius-bars.-

combination of a support, a pair of-jburnah ranged at the 6. In a grinding or polishing machine, the combination ofa support, journal -brackets attached to, said-support, a pair'- ofradius bars oscillating-on saidbrackets-in vertical planes transverse :to each other, a grinding or polishing head arranged at the lower end -of one of said radius-bars, anopposedwork+ear--v y g-head arranged" at "thelower endof the -other radiuabar, and meansfor; imparting differential oscillatory movements to i :said radius-bars,- the samevcomprising a pa r of driving shafts, gear connections? between said'shafts havingqa different number of teeth; -crank-disks:-on said shafts, "wrist-pinson said fiisks; and :pit'manconnections betweensaid wrist-pins: and the respective radiusbars;

7. In a grinding :or polishing =machine,-the

brackets made-vertically adjustable on said support; a pair ofradius-barsoscillating on saidbrackets in vertical planes transverse to each other, a grinding-or polishinghead-arranged at-the lower end ef-one of said;radius-= bars, arr: opposed-work-carrying head ar-y ranged at the lower end of the} -oth1erradius- 1 coinbinatien-of'a support,"a pair ofjournalbrackets made vertically adjustable on said support, a pairoi radius-barsoscillating on I rangedat a said brackets in vertical planes transverse to eachother, a grinding or polishing head are t bar, and -means :for impartingroscillatory ranged at the lower end-of one of said; radiusbars, anwopposed" work-carryin head are-lower end of the other :radiusmovements to said.-radius-bars,. theesame comprising aipair .of driving-shaftspgear cons nectronsibetweensaid shafts, and meansfor transforming. theirotary motion of said shafits 'into oscillatory motions of therespectiue .ra. dius-bars;

p10. Ina-grinding.or polishingimachine,the

combination of a support, a pair of journalbrackets made verticallyfadiustable on said sup. .ort, a pairof radius bars oscillatingxon sai brackets in vertical planes transverse-to each other; a grinding or olishing. heads arranged at the ower end 0 oneof said radius- 'bars, an -o posed work+carrying; -headz an ranged at-t elower-end-of the other radius link, and means for-imparting. diflerentialios- Y cillatorymovements to said radius-bars, the

same comprising-a pair of driving-shafts,

gearconneotions-between said shafts having a diflerent number of teetla and means for transforming therotary-motion of said shafts intooscillatory: motions 'ofthe respective radiusbars; a

1 1. In a grinding or polishingmachine, the combination of'a support, a pair of-jorirnalbrackets made vertically adjustable. on said support, a pajrofradius bars oscillating on sald brackets invertical planest'transverse to each otherya grinding or polishing headv arranged at ,the lower end ofoneofsaid'radiusbars, an:=opposed-workmcarryin .head an ranged at the lowerendiof the ot er radiuslink, andimeans -for' imparting oscillatory movements to said radius-bars, thesame comprisingapair of driving-shafts, geanconnectlons between said sha'fts, crank-disks'-on said-shafts, Wrist-pins on saiddisks, and.pit-

man 'connectionsbetween said wrist-pins and the res eotiveiradiusfbars. s

12. n a grinding or polishing machine; the combination of a support, a pair of'joumalbrackets made vertically adjustableon said support, a pair of-radius-bars oscillatingion said brackets invertical planes transverse-to each other, a grindinger polishing. head-.arranged at the lower end of one ofsaid. radiuss bars, an opposed work'carrying whead-aare ranged at the lowerend of' the other-radiuslink, and means for imparting differential oscillatory movements tosaid radius-bars, the same comprising ;.a pair iof-v driving-shafts, gear connections between said shafts having a diflerent. numbenof teeth, crank-disks 'on said shafts, wrist pins on said disks, and pits man connections-between said wrist-pins and the res ective'Tadius-bars.

13; na grinding or polishing machine, the combination of a support, journal-brackets attached to said support, a pair of radiushare oscillating on. said brackets in vertical planes transverseto each other, a grinding or polishing head arranged at the lower end of one of said radius-bars, an opposed workcarrying head 'pivotally attached to the lower end of the other radius-bar, means for effecting a ivotal adjustment of said head in a vertical p ane, and means for imparting os cil'lator movements to said radius-bars.

14. a grinding or polishing machine, the

- combination of a support, journal-brackets attached tosaid support, a pair of radiusbars oscillating on said brackets in vertical planes transverse to each other, a grindin or polishing head arranged at the lower en of one of said radius-bars, an o posed work-carrying head pivot-ally attac ed to the lower support, a pair of radius-bars oscillating on end of the other radius bar, means for effecting a pivotal adjustment of said head ina vertical plane, and means for imparting diffirential oscillatory movements to said radiusars.

15." in a grinding or polishing machine, the combination of a support, a air of journal" brackets made vertically ad ustable on said sai brackets in vertical planes transverse to each other, a grinding or polishing head arranged at the lower end of one of said radiusbars,.an o posed work carryin head pi-voh ally attac ed to the lower en of the other radius-bar, means for effecting a ivotal adjustment of said head in a vertic'a plane, and means; for imparting oscillatory movements to said radius-bars.

16. In a grinding or polishing machine, the

combination of a support, a pair of journalbrackets made vertically adjustable on said sup ort, a pair of radius-bars oscillating on sai brackets in vertical planes transverse to f each other, a grinding or polishing head arranged at the lower end of one of said radiusbars, an opposed wo'rk-carryin head pivotally attached to the lower end 0 the other radius-bar, means for eiiecting a. pivotal adjustment of said head in a vertical plane, and

means for, imparting differential oscillatory movements to said radius-bars."

17. in a grinding or polishing machine, the

combination of a support, journahbrachets attached to said sup ort, a pair of radiusbars oscillating on said brackets, in vertical sis.

planestransverse to each other, a grinding'or polishing head arranged at the lower end. of one of said radiuabars, an opposed work-carrying headarranged at the lower end of the other radius-bar, means for efiecting a pivotal adjustment of said head in a horizontal plane, and means for imparting oscillatory movements to said radius-bars.

, 18. In a grinding or polishing machine, the

combination of a support, journal-brackets attached to said support, a. pair of radiusbarsoscillating on saidlorackets' vertical planes transverse to each otheri,.a grinding or ceases sai each other, a grinding orip'olishing' head arpolishing head arranged at the lower end of one of said radius-bars, an opposed work-car Tying head arranged at the lower end of the other radius-bar, means for effecting a piv otal adjustment of said head in a horizontal plane, and means for imparting oscillatory movements to said radius-bars.

19. In a grinding or polishing machine, the combination of a support, a pair of journal brackets made vertically adjustable on said sup ort, a pair of radius-bars oscillating on sai brackets in vertical planes transverse to each other, a grinding or polishing'head arranged at the lower end'of one of said radiusbars, an o posed worlecarrying head arranged at t e lower end ofthe other radiusbar, meansfor effecting a pivotal adjustment of said head in a horizontal plane, and'means for imparting oscillatory movements to said radius-bars.

"brackets made vertically adjustable on said sup ort, a pair of radius-bars oscillating on sai brackets in vertical planes transverse to each other, a grinding or polishing head arranged at the lower end of one of said radiusbars, an opposed Work-carrying head arranged at the lower end of the other radiusloar, means for effecting a pivotal adjustment of said head in ahorizontal plane, and means for imparting difierential oscillatory movements tosaid radius-bars.

21 in a grinding or polishing machine, the combination of a support, journal-brackets attached to said support, a pair of radiusbars oscillating on said brackets in vertical planes transverse to each other, a grinding or polishing head arranged at the lower end of planes transverse to each other, a grinding or polishing head arranged at the lower end cf one of said radius-bars, an opposed work-can rying head arranged at the lower endof the other radius-bar, means for imparting diiier:

ential oscillatory movements to said radius 5 20. in a grinding or polishing machine, the 'combinationof a support, a pair of journalbars, and means for efl'ecting a limited vertical adjustment of one radius-bar with rela-- tion to theother.

' '23. In a grinding or polishing machine,'the coinbinatronoi a support, a pair of journal brackets made vertically adjustable on said support, a pair of radius-bars oscillating on brackets in vertical planes transverse to with relation to the other.

24. In a grinding or polishing machine, the

combination of a support, a pair otjournal brackets made vertically adjustable on said sup ort, a pair of radius-bars oscillating on sai brackets in vertical planes transverse to each other, a grinding or polishing head arranged at the lower end of one of said radiusbars, an o posed work-carrying head arranged at t e lower end of the other radiusbar, means for imparting difierential oscillatory movements -to said radius-bars, and,

means for effecting a'limited vertical adjustment of one radius-bar with relation to the other.

25. In a grinding or polishing machine, the

combination of a support, journal-brackets attached to said support, a pair of radiusbars oscillating on said bracketsin vertical planes transverse to each other, a grinding or polishing head arranged at the lower end of one of said radius-bars, an opposed work-carrying head arranged at the lower end of the other radius-bar, means for imparting oscillatory movements to said radius-bars, and means for guiding the lower ends of the radiusbars in rectilinear paths.

26. In a grinding or polishing machine, the combination of a support, journal-brackets attached to said support, a pair of radius.- bars oscillating on said brackets in vertical planes transverse to each other, a grinding or polishing head arranged at the lower end of one of said radius-bars, an opposed Work-carrying head arranged at the lower end of the other radius-bar, means for imparting differ ential oscillatory movements to said radiusbars, and means for guiding the lower ends of the radius-bars in rectilinear paths.

- 27. In a grinding or polishing machine, the

. combination of a support, a pair-of journalbrackets made vertically adjustable on said support, a pair of radius-bars oscillating on sai brackets in vertical planes transverse to each other, a grinding or polishing head arranged at the lower end of one of said radiusbars, an o posed work-carrying head arranged at t e lower end of the other radiusbar, means for imparting oscillatory movements to said radius-bars, and means for guid ng the lower ends of the radius-bars in :rectilinear paths.

' 28. In a grinding or polishing machine, the combination of a su port, a pair of .journalbrackets made vertically adjustable on said support, a pair of radius-bars'oscillating onsai brackets in vertical planes transverse toeach other, a grinding or-polishing head arranged at the lower end of one of saidiradiusbar, means for imparting difierential oscillatory movements to sald-radius-bars, and.-

means for guidin the lower ends of the radius-links in recti inear paths.-

29. In a grinding or polishing machine of I the character herein described, the combination of a work-holding head, and a work-car rying pla/te provided with a bearing-ridge on its face.

.30. In a grinding or polishing machine of "the character herein described, the combination of a work-holding head, and awork-carrying head provided with a bearing-ridge and an annular guiding-ridge on' its face.

31. In a grinding or polishing machine of the character herein described, the combination of a work-holdin head, side cheeks on saidhead having beve ed recesses in their opposed ,faces, a work-carrying plate ha eveled edges, and means for-c amping sai cheeks upon the beveled edges of said plate.

32. In a grinding orpolishing machme of the character herein described, the combination of a work-holding head, side cheeks on said head having beveled recesses in their oposed faces, a work-carrying plate havin eveled edges, and means for c amping sai cheeks upon the beveled edges of said plate, the same comprising screws passing through said cheeks, and a transverse bar receiving said screws.

33. In a grinding or polishing machine of the character herein described, the combination with the grinding or polishing and workholding heads arranged in apposition, of a gallery secured to the lowermost head in a plane with the upper surface of'said head and r provided with an upturned margin.

34. a grinding or polishing machineof the character herein described, the combination with the grinding or polishing and workelastic gallery secured to the lowermost head in a plane with the upper surface of said head and providedwith an u turned margin and a reinforced annular e'ol ar.

36. In a grinding or polishing machine, the hombination of a grinding-head, a work-holding head, and means for imparting difierential reciprocation to said heads in directions transverse to each other, the same comprising a pair of driving-shafts, gear connections between said shafts having a different number of teeth, and means fortransforniing the otary motion of said'shafts intoreciprocatfl mg motions of said heads.

pitrnan connections between said crank-disks 37. In a grinding or polishing machine, the combination of a grindlng-head, a. Work-holding head, and means for imparting diflerential reciprocation to said heads in directions transverse to each other, the same comprising a pair of driving-shafts, gear connections Witnesses: between said shafts having a different num- ROBERT BURNS, ber of teeth, crank-disks on said shafts, and M. H. HOLMES.

Signed at Chicago, Illinois, this 14th day of November, 1904.

' CHRISTIAN C. HILL.

and the respective heads. 10