US698521A - Apparatus for cutting and polishing precious stones. - Google Patents

Description

Patented Apr. 29, |902*l No. 693,521. Y

y F. n. KNEIP. APPARATUS FOB CUTTING AND PULISHING PRECIOUS STUNES.

(Application led Jan. 31, 1901. Renewed Oct. 29, 1901.)

(No Modl.)

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FREDERIQ R. fKNEIP, OF-BOSTON,' MASSACHUSETTS.

APPARATUS Foa CUTTING ANQ P'oLlsl-HNG PREclousl STONES.

SEECIIMATON forming part of Letters Patent No. 698,521, dated April 29, 1902.

` Application tiled January 3l, 1901.A Renewedyoictober 2Q, 1901. Serial No. 80,461. (No modell) To all whom im/wy concern.-

Be it known thatI, FREDERIC R. KNEIP, a citizen of the UnitedStates,residingat Boston, county ofSuffolk, State of Massachusetts, have invented an Improvement in Ap-` paratus for .Cutting and Polishing Precious Stonesyof which the following description, in connection with theaccoinpanying drawings, is a specification, like characters on the drawings representing like parts.

In order to prepare precious stones to be used in rings'or other jewelry, it is necessary to cut and polish the same in order to shape the stone with alvariety of facets,'which are generally arrangedin series, and to make a perfect stoneeach facet of any one series should have the proper angle to the axis of said stone.

One of thev common methods which lapidaries have heretofore employed in cutting precious stones consists in setting the stone in suitable wax secured to the end of a stick and then holding the stone against the revolving lapidarys wheel, or lap, as it-is termed, by means of the stick, the pointed end "of the stick bein g' supported in a suitable recess in a rest or support adjacent t the lap, the said rest serving/to hold the stick at the properlinclination to the wheel or lap. Inthis method of grinding the "stone, however, the angle that the stick should be turned on its axis after one facet has been ground in order to present the stone in the proper posit tively position the stick angularly about its axis, so: that the separate facets in any row of facets will be groundv at equal distances apart and at exactly the same angle to the axis of the stick. I have also provided means for varying at will theinclination of the stick tothe lap, so that it is possible to "grind two or more series of facetsupon la stone at different angles to the axis of the stone or stick.

To accomplish these objectsfmy invention comprises for use in connection with a suit able revolving wheel or lap an overhanging arm or support, from which is suspended a' stick holder adapted to hold f the stick, to which the stone is attached in the usual way, said stick-holder being mounted for movement about both a vertical and a horizontal axis.` A stick-holder has a suitable tapering socket,in which the tapering end of the stick is received, and suitable means are employed for interlocking the stick and stick-holder to properly position the stick angularly about its axis.

` The specilic structure in which I have chosen to embody my invention comprises a vertically-adjustable arm or support, to the end of which is pivoted a head-block to move about a vertical axis, said head-block having pivoted thereto to move about a horizontal axis a stick-holder having a socket to receive the end of the stick to which the stone to be ground is affixed. The horizontal axis about which the stick-holder turns is situated in the same vertical plane as the vertical axis of the head-block and is directly beneath the pivotal support of the head-block, whereby an absolutely universal movement of the stick-holder is secured, and the adjustable arm or support may be lowered until the stick-holder is nearly parallel with the face of the lap Without any of the supporting parts of the stick-holder striking the lap. The stick has adjustably secured thereto a two-part sleeve, one part of which is in the nature of a thimble and may be adjusted about the axis of the stick relative to the other, and the adjustable portion of the sleeve has a series of recesses in its end, which cooperate with an adjustableprojection upon the stick-holder, so that by withdrawing the stick slightly from the' holder andturning the same about its axis any one of the recesses in the thirnbie may be caused to engage the projection on the stick-holder, thus insuring the proper positioning of the stick angularly about its axis, and consequently the grinding IOO of the various facets at equal distances apart. By raising or lowering the vertically-adjustable arm or support the inclination of the stick to the lap may be changed, and by changing the relation between the two parts of the sleeve on the stick a second series of facets may be ground upon the stone, cach facet of the second series having the same angle to the axis of the stone, but adifferent angle from the facets of the iirst series.

I may also, if desired, provide means Whereby the stick-holder may be vertically adjusted with relation to the arm or support, and by this means Ican change the angle of inclination of the stick to the lap without changing the position of the arm or support. This is important, for where a whole series of stones are being ground in the same stick-holder it sometimes happens that the sticks used will be of slightly-different lengths, which results in the facets of different stones being ground at different angles. By means of the vertical adjustment of the stick-holder I can insure that the various sticks shall always have the same angle of inclination to the lap, even though they vary in length.

Referring to the drawings, Figure 1 is a side elevation of my device complete. Fig. 2 is a front View of the device with lthe stick removed. Fig. 3 is a top plan View. Fig. et is a section of the stick-holder on the line Fig. 3. Fig. 5 is a front View of the stick-holder. Figs. 6 and 7 are detailed views of the thimble on the stick; and Fig. 8 is a partial section on line x', Fig. 2.

The polishing-wheel or lap is designated by L, this being of any suitable construction and being mounted for rotation upon the vertical shaft 3.

lidesignates a portion of the bench or table adjacent the wheel, to which is secured in any suitable Way the post or standard 5, said post or standard extending through the bench or table and being clamped thereto by the winged nut 6.

The arm or support which carries the stickholder is designated generally by 7, and said arm has at one end the hub or sleeve 8, which is sleeved over the post 5 and is vertically adjustable thereon, as hereinafter described. As illustrated, the hub 8 of the arm 7 is supported upon an extensible collar, which in turn rests on a split stop-collar 11, which is clamped to the post in any desired position by means of the bolt, 12 in the usual way. The extensible collar comprises the exteriorlyscrew-threaded bushing or collar 9, which is loosely sleeved over the post 5 and which is provided With the milled portion 9X, by which it may be turned, and the sleeve 10, having the interior screw-threads to iit those on the collar 9 and iixedly secured to the stop-collar 11 by means of pins 11', which project from the said collar into the lower end of the sleeve 10, as seen in dotted lines in Fig. 1.

Preferably the screw-threaded collar 9 will be provided with suitable graduations, as 13,

and the sleeve 10 will be provided with the mark 14, which cooperates with the graduation 13, the purpose of the graduations being to guide the lapidary in adjusting the arm 7 to the proper height in order to grind facets at a predetermined angle, for it will be obvious that by having the graduation-marks 13 properly labeled in termsof angles when the lapidarydesires to grind facets on a stone at an angle of, say, forty-ive degrees he will merely have to turn the collar 9 until the forty-five-degree mark registers with the mark la on sleeve 10 and then lower the arm 7 till its hub 8 rests on the collar 9. In order to grind facets at any other predetermined angle, he will merely have to turn the collar 9 up or down to bring the mark indicating the desired angle into register with mark 14E and bring the hub 8 of arm 7 down onto said collar 9, when the said arm 7 will be properly adjusted to grind the facet at the correct angle. In order to hold the said arm from turning after it has been adjusted to the proper height, I preferably split the hub 8, as shown in plan in Fig. 3, and provide the same with the lugs or ears 15, through which the clamping-bolt 16 passes, upon which is mounted the winged nut 17, this operating as a simple clamping device.

The arm 'is preferably jointed intermediate its length, the two parts 18 and 19 thereof having the eyes 20, through which the pivot-bolt 21 passes, the upper end of the bolt having the clamping-nut 22 thereon, whereby the two parts may be rigidly clamped together when adjusted into the proper position. The outer end of the portion 19 of the arm has the stick-holder pivoted thereto for movement about both a vertical and a horizontal axis, one good way of doing this being to pivot to the end of said arm for movement about a vertical axis a head-block, to which in turn the stick-holder is pivoted to move about a horizontal axis, the horizontal axis of the stick-holder being directly underneath the vertical axis of the block. To accomplish this, I provide the end of the arm with the offsets 23 24, the olfset 24 having the socket 25 therein, in which sets the pointed end of the pivot-pin 2G, the upper end of said pin having a socket, in which sets the pointed end of the set-screw 27. The pivot-pin 26 is therefore mounted to turn about a vertical axis, and adjnstably secured thereon is the headblock 28, said head-block being sleeved over the pivot-pin 26, as shown, and provided with the set-screw 29 for clamping it in any adjusted position.

As illustrated in Fig. 8, the head-block 28 is provided With a longitudinal groove directly underneath the set-screw 29, in which groove is fitted a spline 7l, which rests against the smooth exterior surface of the pin 26 and against which the set-screw 29 bears, the purpose of said spline-being to obtain an even bearing on the pin 26 and prevent the end of the screw 29y from engaging IOO IIO

the same. 'Preferably the innersurface of.

block are the arms 30'31, in the lower'end of i which is mounted for movement about a horizontal axis the stick-holder proper, 32, the said stick-holder being shown as aL short cy- Alindrical body having central of its ends suitable sockets, in which are seated the pointed ends of pivot-screws 33, supported in the lower end of the arms 30 3l,` as shownin Fig. 2. The stick-holder 32 therefore can turn about its horizontal axis' in the arms ofthe head-block, and by swinging the head-block about its vertical axis the `stick-holder has also movementaboutthe same vertical axis,`

the stick-holder being therefore mounted to move about both ahorizontal and a vertical axis.

Referring to Fig. 1, it will be seen that the horizontal axis of the stick-holder in the headblock is in the same Vertical plane as the vertical axis of the head-block, so that the vertical axis about which the stick-holder moves intersects the horizontal axis, whereby the stick-holder is capable of la universal movement about a fixed center of motion. Furthermore, the point of intersection between the vertical axis of the stick-holder and the horizontal axis thereof is on the axis of the socket in the stick-holder, so that when the stick is inserted in the stick-holder the fixed center of motion of the stick-holder, which is the point of intersection between the vertical and horizontal axis thereof, is in the axial line of the stick. Hence the stick itself has a universal movement about a fixed center of motion. By constructing the headblock with the depending arms the pivotal point of the stick-holder in the arms is brought below the pivotal support for the head-block, so that the arm 7 may be so adj usted as to bring the stick-holder nearly parallel with the face of the lap without any portion of the support thereof striking the lap.

From the aboveit will be seen that the stick-holder is suspended from the arm '7, so`

that the said arm 7 is in the nature of an overhanging arm, from which the stick-holder is suspended and to which it is pivoted for movement about both a vertical and a horizontal axis.

'My invention, therefore, in its broadest sense comprises an overhanging arm having the stick-holder suspended therefrom in such plished, yet it will be obvious that the end lnightbe lsecured in illustrated.

The stick-holder is provided witha taperother ways 'than thaty .ing-socket, and the end Orth@ Stick'whiehfis inserted finto said socket is 'also tapered, so i as to fit the tapered socket, and thus hold the stick steadily during the grinding operation.

To prevent the stick from turning about its axis after it has been inserted into the socket, the stick-holder carries suitable means which engages corresponding means secured directly to the stick-holder intermediate or between its ends, whereby the stick-holder and stick are interlocked together. The interlocking connection, which is situated between the ends of the stick-holder, is of such a nature that whenthe stick is withdrawn from the stick-holder the interlocking connection is broken, after which the stick may be turned about its axis and again inserted into :the socket, when the interlocking connectionopcrates to lock the stiokagainst` rotation/and also to give it a definite angular positionthat is, a definite position about its own axis` whereby after grinding one facet the stick may be readily brought and held into the proper position for grinding the next facet. This result may be accomplished ,in various ways, and the drawings show the best `mannernow known to me for securing these ends. Looking at Figf/t, itwillbe .seen that the stick-holder is provided with a transverse cylindrical socket, in which is removably mount- IOO inner face concave to fit the convex outer surface of the socket-piece 37 erably make the said spline with a slight longitudinal convexity, so that whenin place, with the set-screw36 bearing thereon, the pressure thereof onthe socket-piece or sleeve 37 will be uniform throughout its entire length. i

The means for interlocking the stick with the stick-holder in order to angularly position the stick during the grinding operation com- I will also pref prises a suitable projection oni one of said j parts which is adapted to engage anyoneof `a series of recesses or notches in" the other of said parts, and in the drawings I have shown the outer end of the sleeve as provided with a projection 39, said projection coperating with any one of a number of notches or frecesses 40, whichare carried by thelstickin-l termediate its ends,the said notches `being nshown as formed in the end ofa two-part iisleeve, which is adjustablysecured to the stick 3S, the said `two-part sleeve being illus- `trated as comprising the splitband 41, which i 1is clamped to the stick by means of a clamping-boltpassing through thelugs 423thereon and `the thinible 43, which is provided at'one end with 'a series of slits 44 to engage a inv45 on the band 41 and at the other end is provided with the'recesses 40, beforereferred to. The' stone is'shown at 50 in Fig. 4, and this is secured to they end of the stick 38 by means of the wax 51, as usual in this art.

From'this description it will be seen that, supposing there are eight recesses 40 at equal distances apart in the end of the thimble 43, by inserting the stick into the socket-piece or sleeve/37, so that the projection 39 engages one of Ythel recesses 40, andby adjusting the arm 7 to the proper height the lapidary may swing the stick down into contact with the lap'L and grind one facet on the stone 50. When this facet has been properly ground, by simply withdrawingthe stick slightly from thestick-holderv and turning the same about its axis'until theA next adjacent recess is in line with the projection 39 and then reinserting the stick in the stick-holder a second facet may be groundv which has the same angle to the axis of the stick as the first facet, and by continuing this process a series of eight facets will bey ground upon thev stone, each of which will not only have the saine angle'to the axis of the stick, but will also be of the same size-that is, spaced equal distances apart angular] y. When the first seriesof` facets has been ground, the stick will be removed from the stick-holder and the thimble 43 removed from the band 41 and turned upon the stick so as to bring one of the other recesses 44 into alinement with the fin 4 5, and if the second series of facets is to be ground at a different angle to the axis of the stone or stick either the arm 7 or the head-block 23 will be raised or lowered, when the grinding operation will proceed as before, the second series of facets being ground intermediate the first series and at a different angle. It will thus be seen that 'by providing a series of thimbles 43, each having a different number of recesses 40 and a different number and arrangement of slots 44, the .same device may be used for grinding stones into a great variety of shapes and always with theassurance that the various facets will be absolutely and accurately ground and at the correct angle.

I may, if desired, provide the stick-holder 32 with the scale 55, with which the projec-v tion 39 upon the socket-piece 37 cooperates, so as to insure that the said socket-piece is inserted in the stick-holder in the correct position. I may also use this device instead of the removable thimble 43 for obtaining a second series of facets at a different anglefrom or intermediate the first series of facets, vfor after grinding one series of facets the sleeve 37 may be adjusted in the socket about a certain'angle, to be measured Yby the scale 55, when the second series of facets will, of course, be ground at a different angle.

It should be here remarked that, preferably, set-screw 36 will be so adjusted that the friction between the spline 35 and the socketpiece or sleeve 37 will be sufficient to hold the 6es,52i I said socket-piece from turning under ordinary conditions; but bythe application of acertain amount of force it may be turned into any desired position.l

In order that all of the facets may be ground to exactly the same size, I have provided a suitable adjustable stop device for limiting the downward swinging movement of the stick 38, which will insure in grinding the series of facets that the stick'will always assume the same inclination during the grindvingoperation. Thisadjustable stop comprises thepin 60, securedvin the stick-holder 32,

which cooperates with an adjustable stop, as 6l, carried by the swinging arm 62, said arm being pivoted upon one of the pivot-screws 33 and having. at its free end a'clamping-nut 64, which engages a bolt passed through the said arm and a slot in a guide-plate 65, which is secured to the depending arm 31. A slot 66 isaflso provided in which the stop-pin 6l may operate. With this construction it will be seen that the stop-pin (SO by engaging the stop-arm 61 will prevent the stick from being depressed below a certain predetermined position, and for the guidance ofthe lapidary I preferably provide the plate 65 with a series of graduation-marks 67, with which a pointer 68 on the end of the armr62 coperates.-

In using my improved device the collar 9 will be adjusted properly, as above described, to grind the facets at the desired angle, and the arm 62 will also be set to indicate the same angle. The lapidary will then insert the stick in the stick-holder and proceed with the grinding, the stop 60 acting to limit the downward .movement of the stick, and thus insuring that the facet will be of the correct size and absolutely at the correct angle. After one series of facets has been ground the thimble 43 may be adjusted, as above described, and either the head-block 2S or the entire arm 7 raised and the arm 62 properly adj usted, when a second series of facets may be ground intermediate the first series and at a different angle. These operations may be repeated until the stone is ground into the desired shape. .The universal joint between the stick-holder and arm or support enables the lapidary to give to the stick as free a movement as possible, which is highly essential in this art, and yet at the same time the stick is positively positioned angularly, so that the facets will necessarily be ground correctly.

In some cases it is desirable to use only a certain portion of the surface of the lap-as, for instance, the outside edge thereof-in which case the lapidary will loosen the nut 16 and swing the arm 7 on the post 5 away from the lap and clamp the same in position, when the stick-holder may be swung about its vertical axis toward the lap, its inward movement being limited by the arm 30 striking the head 73. When thus adjusted, the grinding will all be done on the outside portion of the lap.

IOL'.

IIO

portion 18 so that thesticklmay point in anyA desireddirectionwith reference to direction of movement of Mthe surface of the lap.

In case a seriesof` stones are to be' ground `With facets at thesanie` angle and the sticks Patent,` isi-f i vary slightly inlength `suchvariation may be f From' the above description it will be seen that Ihave provided a device comprising an overhanging arm or support fromvvhich` is `suspended and tofvvhich'is` pivotally mounted, both for movement about a vertical and 1,a horizontalaxiaa stick-holder adapted to receivethe `end of a stick, and suitable means are providedv for angularly positioning the stick about `its ownaxis and for holding the same insuchcorrect angular position during the grinding toperation, whereby the facets may be ground accurately and evenly.u i

It Will be obvionsto thoseskilled in the art that various changes may be made in the structure of. the device Without `departing from` the spirit of my invention, and I- therefore reserve the right to make such changes as come Within the scope of the appended claims. f i y Having described my invention,` whatI claim as neW,`and desire tosecure by Letters l.' In an apparatus of theclass described, an

overhanging arm or support, a stick-holder@` suspended therefrom and pivoted thereto for movement aboutboth ahorizontal and a vertical axis, said stick-holderhavin g means Ito hold the stickfrom turning.

2; In an apparatus of the class described, an i arm or support, a head-block pivoted thereto tomove about avertical axis,a stick-holder pivoted to said head block formovement about a horizontal axis, said horizontal axis being in line with and vertically underneath the" pivotal support of the head-block, said stick-holder having means forsupporting a stick, and means to position the stick angu-` to interlock With the stick-holder whereby the sticky may be positioned' an gula rly about its axis. 4. In an apparatus of the class described, an

arm or support, a vertically-adjustable head1 block pivoted thereto for movement `about a vertical axis, a stick-holder pivoted to said head-'block tomove` about `a horizontal axis,

said horizontal axis being in line with and vertically beneaththe pivotal support ofthe head-block, said stick-holder havinga socket adapted to receive; the end of a stick, and

position.` i

means to position the stick angularly about its axis. i

5. Inan apparatus ofthe class described, a vertically-adjustable arm or support, a vertically-adjustable stick-holder pivoted thereto for movement aboutboth a vertical and a horizontal axis, said stick-holderhaving a socket adapted to receive the end of a stick, a thimble secured to the stick intermediate its ends said thimble having means to 'interlock the same with the stick-holder.

6. In an` apparatus ofthe class described, a

`stick-holder pivoted to ,move` aboutboth a vertical and a horizontal axis,"` and having a socketadaptedto receive theend of a stick, a thimble secured to the stick intermediate its ends one of saidpartshaving a series of radial recesses, andthe otherof said` parts having a projection to engage said recesses, whereby thestick may be turned axially and held in` any adjusted position" to grind the facets.`

7. In an apparatus `of the class described, a stick-holder pivoted to move about both a vertical and a horizontal axis, and having a socket adapted toreceive 'the end of a stick, a thimble` secured to the stick intermediate its ends, `said thimble havingat one end a seriesof radial recesses, an adjustable projection on 'the stick-holderto engage said recesses, when the stick is inserted in the stickholder, whereby the stick maybe turned about its axis, and held in any adjusted position.` i 8. In an apparatus ofthe classdescribed, a

stick-,holderpivoted to move aboutboth a i l `vertical and a horizontal axis, andhaving a :o5 i

socket adapted toreceijve the endof a stick,

a two-partsleeve adjustablysecured tothe j stick intermediate its ends, oneof the parts of said sleeve being adjustable about the axis of'the'stick relative to the other, and having at one enda series of` radialrecesses, a projection on said stick-holder to engage saiolre'-` cesses, whereby the stick -holder may be turned about its axisand heldin any adjusted i 9: In an apparatus of the class described, a

`vertically-adjustable stick-holder pivote'd to move about both a vertical and a horizontal axis, said stick-holder having socketadaptedto receive the end of` a stick, a sleeve or thimble secured to the stick intermediate its ends', said thimble having at one end' a series" of radial recesses, a projection on said stickhold er to be engaged by said recesses, `Wherebybyturning the stick about its longitudinal axis the facets are positioned, and by the ver tical adjustment of the stick-holder the facets "may be made at dierent angles to the axis of the stick.

10. In an apparatus of the class described,

an approximately horizontal arm mounted lmovementabout both a vertical and a hori-` zontal axis, said stick-holder having means to angularly position the stick about itsaxis.

11. In an apparatus ofthe class described, a post orstandard, an arm vertically adjustable thereon, said arm having' a hub sleeved over said post,y an extensible collar upon which the hub rests, a stop-collar on the post supporting the extensible collar, combined with a stick-holder pivoted to the end of the arm for movement. about both a vertical and a horizontal axis.

12. In an apparatus of the class described, a post, a stop-collar thereon, a sleevesecured to said stopcollar and havinginterior screwthreads, a rotatable bushing having exterior screw-threads engaging those of the sleeve, and an arm having a hub sleeved over said post and resting on said bushing, combined with a stick-holder pivotally mounted on said arm, the construction being such that by turning the bushing the height of the arm may be adjusted.

13. In an apparatus of the class described, a post or standard, an arm having a hub sleeved over said post, a rotatable bushing on the post upon which said hub rests, said bushing having a sleeve screw-threaded thereon, whereby the said bushing may be made extensible, an-adjustable stop-collar on the post upon which the sleeve rests, the extensible bushing-providing means for controlling the height of the arm, combined with a stickholder pivoted to the arm to move about a vertical and horizontal axis, said stick-holder having means to receive the end of astick and to position the stick angularly about its axis.

14. In an apparatus of the class described, i

a vertically-adjustable arm or support, a

` head-block pivoted to the end thereof to move about a vertical axis, a stick-holder pivoted to said head-block to move about a horizontal axis, said stick-holder having a socket to receive the end of the stick, and having means to position the stick angularly about its axis to form the various facets.

15. In an apparatus of the class described, an arm or support, a head-block pivoted to said arm to move about a vertical axis, said head-block having depending arms, a stickholder pivoted to the said depending arms of the head-block to move about a` horizontal axis, said stick-holder having a socket to receive the end of a stick, and having means to lposition the stick angularly about its'axis to grind various different facets, said headblock having an adjustable stop-arm, and said stick-holder havinga pin adapted to engage said arm to limit the downward movement of the stick.

16. In an apparatus of the class described, a stick-holder mounted for movement about both a vertical and a horizontal-axis, said stick-holder having a socket provided with an adjustable socket-piece which is adapted to receive the end of a stick, said socketpiece having means to an gularly position the stick about its axis, and a scale on the stick- `termined.- l

holder cooperating with the socket -pi'ece whereby the correct angular' position ofthe socket-piece in the stick-holder may be de- 17. In an'ap'paratus of `the class described, a stick-holdermounted for movement'about both a. horizontal and' a vertical'axis, said stick-holder1 having a socket provided with an adjustable socket-piece which is adapted to `receive thefend of a stick, a sleeve or thimble on said'stick, said thimble and socketpiece having engaging means toposition the stick angularly'about its axis, and means to determine the correct angular position of the socket-piece in the stick-holder.

18. In an apparatus of the class described, an arm or support, a head -block pivoted thereto to move about a vertical axis and having depending arms, a stick-holder pivoted to said depending arms to move about a horizontal axis, said stick-holder having means to hold a stick and position it an gularly about its axis, said head-block having an adjustable stop-arm pivoted theretol and a scale with which said arm cooperates, and a stop-pin on the stick-holder adapted to engage said arm and limit the downward movement of the stick.

19. In an apparatus of the class described, an arm or support, a stick-holder pivoted thereto to move about both a vertical and a horizontal axis, said stick-holder having a socket adapted to receive the end of a stick, the vertical and horizontal axis of th-e stickholder intersecting each other and the point of intersection being on the axial line of the socket whereby the stick supported in the socket may be swung in any direction about a fixed center of motion.

20. In an apparatus of the class described, an overhanging arm or support, astick-holder suspended therefrom and pivoted thereto for movement about both a horizontal and a vertical axis, said stick-holder having means to hold the stick from turning, and stop devices to limit the movement of the holder about its horizontal axis.

2l. A stick adapted to carry a stone at one end, and tapered at its other end, said stick presenting between its ends a series of notches, the number of notches in the series corresponding with the number of facets to be cut in one round of cuts, a pivoted stickholder having a tapered socket to receive the tapered end of the stick, and a portion c0- acting with said notches to restrain the rotation of the stick about its axis while a facet is being ground, said socket receiving and sustaining the stick yet permitting said stick to be freely withdrawn therefrom after the stone has been cut, that another like stick may be inserted in the socket.

22. A stick having one end tapered and adapted to carry a stone at its other end, a pivoted stick-holder having a tapered socket to receive the tapered end of the stick, one of said parts having a series of notches and the IOO IIO

othen a projection `adapted to cooperate therewith, said notches and projection being situated between theends of the stick and serv-` ing to hold the stick frointnrningduring the grinding of the facets, thetconstructionbeing such that the 'Ustick maybe freely Withdrawn frornits socket after the stone has beencut,

i and another like stickinsertedin said socken` 23. A stickhaving one end tapered and adapted to carry a stone at its other end, a

\ pivoted Stick-holder having a taperedsocket to receive said tapered end of the stick, said stick and stick-holder having interlocking` devices situated between Vthe ends of the stick, said interlocking devices serving to hold the stick from turning during the grind- "ing of the variouefacets on the stone, the

construction being such that the stick may be freely withdrawn fronithesocket after the stone has been cnt, andfanother like stick inserted in saidsock`et.` i i i y 24. Astickholderhavingasocket-piece to receive thetapered endof alstickfan'dlneans fwhereby che `socketfpiece maybe turned about its longitudinalaxis` in` the stick,A t0 Y therebyprovide for increasing the nmber of facets Whichmay be cut on the stone carried at the end of the stick. i

V In testimony WhereofI haveisigned my' name to thisispeciiication in the presence of 3o two subscribing Witnesses. y FREDERIC R: KNEIP. a Witnesses: Y

GEO. W. GREGORY,

AUGUSTA E. DEAN.

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