US1305038A - Precious stohe - Google Patents

Description

H. DE VRIES AND W. A. DONALDSON.

APPARATUS FOR GRINDING 0R POLISHING PRECIOUS STONES.

APPLICATION FILED JUNE 13| l9l8.

LSQB.

H. DE VRIES AND W. A. DONALDSON.

APPARATUS FO-R GRINDING 0R POLISHING PRECIOUS STONES. APPLICATION FILED JUNE I3. 191s.

l SQ., f Patented May 27, 1919.

4/ 2 SHEETS-SHEEI 2. J' ,(5. F' ,4, +26 A7 47 g HARRYDE VRIES, F NEWARK, NEW JERSEY, AND W ILLIAM AaTHUa noisennson',

OF BRGOKIJ'YN, NEW YORK.

nPPenATUs non oninnm'e on Ponrsnine PRncIoUs sTonns Specification of Letters Patent,

l Patented May 2'?, 1212.

Application filed .T une 13, 1.918. Serial No. 239,770.

To all whom t 'may concern Be it known that we, HARRY DE VRIES and WILLIAM ARTHUR DONALDSON, both citizens o f the United States, and residents, respectively, of Newark,

` 1,243,491, granted to uson October 16,' 1917.

The object of the presentr invention is to provide a new and improved apparatus for grinding 0r polishing diamondsand other precious stones,and arranged to enable` thev operatorto quickly and accurately adjust the dop-holding device in an up and down direction to 'correctly locate the .precious stone relative to the lap. Another object is to permit the wormnan to readily detach the dop-holding device from the frame and store it with the precious stone attached thereto during the non-working hours in a safe, Vault, or similar place, and to re-attach the dop-holding device at the beginning of the neXt work day to the frame and-in eX- actly the same position as it was in on removing it therefrom. Another object is to simplify the construction of the mounting of the dop holder in the carrier.

With these and other objects in view, the invention consists ofp certain novell features of construction a's hereinafter shown and described and then specifically pointed out lin the claims. 3

A practical embodiment of the invention is represented in the accompanying drawings orming a part of this specification in which similar characters of reference indicate corresponding parts in. all the views. Y Figure l is aside elevationof the apparatus for grinding and polishing precious stones;

Fig. 2 is a plan view of the saine;

by a set Fig. 3 is an enlarged sectional side elevation of the saine on the line 3-3'of Fig. 2;

Fig. 4 is a cross section-of the saine on the line 4 4 of Fig. 1;

fFig. -5 lis an inverted plan view ofthe same; and

.f Fig. 6 is a sectional plan view of part of the same on the line 6-6 of Fig. 1.

The lap 10 is arranged a short distance above a table 11 on which rest the legs 12 of the frame 13 supporting at its free end a dop-holdin device 14 carrying the precious stone 15 to e ground or polished on the upper surface of the lap 10. rl'he frame 13 is provided near its forward, end with a spirit level 16 of usual construction to enable the operator to readily maintain the frame 13 in a horizontal position. The frame 13 is provided at its rear end with the usual horizontally disposed rod 20 held against lateral v displacement by abutting against a vertical post 21 rising from the table 11.

The frame 13 is provided at its forward end with a bearing in which lis mounted to slide u and down a hollow stein 26 pro# vided wit a key 27 engaging a keyway arranged in the bearing 25 to hold the stem 26 against turnin but to allow up and down movement of t e said stem. The front face of the stem 26 is providediwi'th a flattened 28 (see Figs. 1, 4 and 6) engaged j screw 29 screwing in the bearing 25 and adapted to securely fasten/thestem 26 inthe adjusted position.

in thevhollow stem 26 is mounted to turn a spindle 30'provided at. itslower end with the web'31 of a sector 32, preferably in the form of a dovetailed tongue engagedby a dovetailed vrgroove 33 (see Fig. 2) Jformed in a carrier 34 forming part of the dop-hold- -ing device 14. One or two'set screws 35 secure a collar 34 a ainst a liner 36 abutting portion against one side o the sector 32 (see Fig 2) to securely hold the carrier 34 in the desired adjusted position von the sector 32. The spindle 30 of the sector 32 is provided at its upper end lwith a screw having a the upper end of the stem 26 to support the spindle 30 in the stem` 26, as will be readily lll? head 41 seated on-a shoulder 42 formed in understood by reference to Fig. 3. The spindle 30 is adapted to be 4clamped 1n the dei vsired adjusted position by a clamping bar slide the carrier 34 45 held in a slot 46 formed in the wall of the stem 26,` and the said clamping bar 45 is engaged by a set screw 47 screwing in the bearing 25 and abutting against the said clamping bar 45 to force the latter into firm engagement with the spindle 30. It will be noticed that when the set screw 47 is loosened the spindle 30 can be readily turned in the stem 26 to move the dop-holding device 14 into a desired position, and when this position has been reached the set screw 47 is screwed up to clamp the spindle 30 in position in the stem 26 by the action of the clamping bar 45. The lower end of the stem 26 is provided with a collar 50 provided on its peripheral edge with a graduation 51 corresponding to the points of -a compass, and a pointing mark 52 is arranged on the back of the sector web 31 to register with any one of the marks of the compass lgraduation 51 (see Fig. 4). The sector 32 is provided on its peripheral face with a segmental gear wheel 60 in mesh with a pinion 61 secured 0n a Shaft 62 extending transversely and journaled in the carrier 34. The front end of the shaft 62 is provided with a head 63 adapted to 'be taken hold of by the operator for turning the pinion 61 to aroundv on the sector 60 according to the direction in which the shaft 62 is turned at the time, it being, however, understood that during this adjusting movement of the carrier 34 on the sector 32 the set screws 35 are loosened and after the desired adjustment is made the set screws 35 are screwed up to lock the carrier 34 in position on the sector 32.

The carrier 34 is provided with a pivot 70 preferably in the form of a cup having a flange 71 at its upper end seated on a shoulder 72 formed on the carrier '34 (see Fig. The lower end of the pivot 70 projects into a central recess'75 formed in a dop holder 76 mounted to turn on the said pivot 70. The top of the dop holder 7 6 abuts against the under side of the carrier 34 and a screw screws centrally into a centralbore 78 in the dop holder 76.` The said screw 77 extends through the bottom of the pivot and is rovided with a head 79 against which a uts the upper en'd of a spring 80 seated at its lower end in the bottom of the cup-shaped pivot 70. By the arrange-` ment described the dop holder 76 is mount# ed to turn on the pivot 70 and is held against' accidental turning by frictional contact of its top with the under side of the carrier 34 owing to thepressure of the spring 80. The face of the dop holder 76 is provided with a raised knurled band 81 adapted to be taken hold of by the operator to permit of coneral face of the dop 85 of the dop 86 carrying the precious stone 15 in the usual n1anner,"the said dop 86 being securely held in position on the dop holder 76 by a set screw 87 screwing in the lower end of the dop holder 76. The periphholder 76 is provided with an annular graduation 88,- preferably in the forni of thirty-two marks `spaced equal distances apart. A pointing mark 89 is ar-` ranged. on the face of the carrier 34 (see Fig. 1) adapted to register with any one of the marks of the graduation 88 on turning the dop holder 76 on the pivot 70, as above explained. It is understood that this graduation 88 serves to aid the operator to adjust the dopholder 76 and consequently 4the dop 86 and the precious stone 15 carried thereby, to set the stone 15 in proper relation to -the lap 10 and to the number of facets. 1t is further understood that the dop holder 76 can be readily'turned on the carrier 34 owing to the yielding connection by the use of the spring and the pivot 70- and at the same'time the dop holder 76 is securely held in the adjusted position by frictional contact of its dop with the under side of the carrier 34. x

In order to properly support the stone 15 in the dop hold'er 76 use is made of the usual rod 90 provided with a claw 91 engaging the projecting end of the precious stone 15 held in the dop 86, as plainly indicated in Figs. 1, 3, 4 and 5. The rod 90 is held' adjustably 1n an up and down direction in aY bracket 92 attached to the carrier 34, and the rod 90 is fastened in the adjusted position by a set screw 93 screwing in the bracket 92 and:

against the rod 90, as plainly shown in In order to indicate the exact angular position of the facets of the stone 15 relative to the face of the lap 1()v use is made of a degree scale 100 (see Fig. 1) marked on the web 31 of the sector 32 and a pointing mark 101 is marked on the face of the carrier 34 to register with'any one ofthe degree marks on imparting a sliding motion to the carrier 34 on the sector 32, as previouslyexplained. When the several parts are in the position shown in the drawings theny the mark 101 is opposite zero of the graduation 100 and the axis of the dop 86 is vertical and parallel to the axis of the spindle 30, and in which spindle axis the center of the sector 32 is located. downward on the sector 32 the position of the stone- 15 relative to the lap 10 is correspondingly changed, 'the corresponding degree of the scale 100 indicating the angle of a facet relative to the face of thc lap 10.

tenaces 'lhusl by the arrangement described, ltheop-A dle 30 carrying the sector 32 andthe dop` holdingdevice 14 Vturnedole in the stem 26,

vit is evident that the stone l5 can be moved in Contact with dillerent portioris ofthe face of the lap 10 to allow` of utilizmg the entire face of the lap 'for grindin will further loe-noticed that y the arrangement described the dop-holding device can be readily vdetached from the frame 13 on loosening the set screws 29 and 47. and sliding the-stem 26 out of the bearing 25. ,The dop-holding device can now be readily stored in a safe, vault or other place, with the 'precious stone attached to the dop 86', and when it is desired to again proceed with the: grinding or polishing'operation of the precious stone l5 Jit is only necessary for the operator to remove the dop-holding device' from the storage place and rengage the stem 26 with the bearing 25 and screw up the'set screws, 29 and 47 to again fasten the4 dop-holding device in exactly the same position in the frame 15, that it had when it was removed therefrom for storing purposesllt is understood that the distance the stem 26 is moved: up or down in the bearing25 is readily determined by the position of the spirit level 16 which when in central position .indicates that the frame 13 is in a horisfrontal position with the Astone. in contact with the lap l0 and irrespective ofthe position or' the carrier 34 on the sector32v or the position or the dop holder 76 on' the carrier 34 l-laring4 thus described our invention, we claim as new and desire tosecure by Letters Patent A l.; ln an apparatus for grinding or polishing preciousstones', a frame adapted* to'rest at one end on a support and provided at its free end'vrith a bearing, a hollow stem adjustably secured in the said bearing,a sector having a spindle mounted to turn in the said hollow stem,`a .clamping member held in the c/said stern and engaging the said spindle, a

set screw "screwing in the said bearing f againstv the said clamping member to torce the latter in clamping contact with the said. spindle to hold the latter against turning in the stem, and a dop-holding means adjustahly secured to the said sector.

2. ln apparatus for grinding or polishing precious stones, a iframe adapted to rest at one end' a horizontal support and provided at its other end with a hearing having a lreyway, a hollow stem slidable up or down in the said hearing and having a'lrey engaging the said'leyway, means for adjustahiy securing the stern in the bearing, a sector purposes. lty

provided with a spindle mounted to turn in the said 'hollow stem, means forsecuring the spindle in and to the sleeve, means fastening .the said spindle inposition against turning in the said stem, a carrier mounted to slide on the said sector, a dop holder mounted to turn onthe said carrier, and a dop removably held onthe said dop holder.

3. ln anapparatus y:i'or grinding or polishing precious stones, a frame adapted to rest at one end on a horizontal support and provided at its other end with a bearing having a keyway, a hollow stem slidable up or down in the said bearing and having a key engaging the said keyway, the said stem having a collar provided with aI compass graduation, asector having a pointing mark and provided 'with a spindle mounted to turn in thc said hollow stem, means fastening the said spindle in position against turning in the said stem, a carrier mounted to slide on the said sector, a dop holder mounted to turn on the saidlcarrier, and a dop removably held on the said dop holder.

4, ln an apparatus for. grinding and pol- -ishoing preciousstones, a support, a carrier adjustably mounted in the support, a cupshaped pivot carried by the carrier, a dop holder engaging the carrier and having its upper end. recessed to receive the pivot, a screw passing through the pivot and screwing into the dop holder, a spring surrounding the screw between its head and the 'bottom of thev cup, and a dop carried by the said holder.

5.., ln an apparatus for grinding and polishing preclous stones, a support, a carrier Iladjustalolymounted on the support, a cupl shaped pivot carried by thev carrier, a dop holder abutting against the carrier and provided, with a bore having its upper end recessed to receive the cup-shaped pivot, a screw passingthrough the cup-shaped pivot and screwing into the bore of the dop holder, a spring surrounding the screwin the pivot between the bottom thereoic and the head of i the stern, a clamp bar in the slot or the stemand engaging the spindle, a set screw mounted in the bearing and engaging the clamping har l dop holding means adiustahly mounted on the sector.

7. ln an apparatus for grinding and polishing precious stones, a 'l'rame provided slide but not to turn in the bearing and provided with an 0 eniug and internal shoulder at it's upper end), a sei; screw for adjustably securing the stem in the bearing, a dop holding device having a member provided with a spindle extending into the stem, a screw screwing into the upper end of the spindle set screw engaging the clamping bar.

. HARRY mi VRIES.

WILLIAM ARTHUR DONALDSN.

Images