US557981A - John edward evard - Google Patents

Description

(No Model.) J.E.EVARD.

MACHINE FOR SETTING PRECIOUS STONES IN DOPS FOR POLISHING AND GRINDING.

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m @E, 9 WM 7, U 5 W, 5 a N NITED TTATES PATENT OFFICE JOHN EDWARD EVARD, OF INDIANAPOLIS, INDIANA.

MACHINE FOR SETTING PRECIOUS STONES IN DOPS FOR POLISHING AND GRINDING.

SPECIFICATION forming part of Letters Patent No. 557,981, dated April 7, 1896.

Original application filedApi-il 23,1895, Serial No. 546,877.

Divided and this application filed June 16, 1895. Serial No.

552,955. (No model.)

To aZZ whom it may concern:

Be it known that I, JOHN EDWARD EVARD, a citizen of the United States, residing at Indianapolis, in the, county of Marion and State of Indiana, have invented certain new and useful Improvements in Machines for Setting Precious Stones in Dops for Polishing or Grinding; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My said invention consists in an improved construction and arrangement of stand embodying a clamping device and mold for use in setting and securing diamonds. upon a dop preparatory to being placed in a dop holder or frame to be polished, by the use of which 1 the fusible metalwhich is used to secure said stone may be easily and quickly changed around it to expose different portions of its surface, as desired.

This application is a division of my application, Serial No. 546,877, filed April 23,1895, and its subject-matter is therein shown and briefly described, but not claimed,it being especially designed for use in connection with the dop-holding frame forming the subjectmatter of said application, but may be used with other polishing mechanism, as will be readily understood.

Referring to the accompanying drawings, which are made a part hereof, and on which similar letters of reference indicate similar parts, Figure 1 is a perspective view of said stand embodying the clamping device and mold; Fig. 2, a detail side elevation of a portion of said stand; Fig. 3, a detailvertical section through a portion thereof, and Fig. 4 a detail view showing a diamond in its seat on the dop.

In said drawings the portions marked A represent the main portion of the frame or stand; B, the clamping-rod or jaw; C, the dop, and D the mold. Said stand A consists of a suitable basehaving hinged to it, by means of a pivot a, a horizontal plate A, which carries upon one end a curved upright Aiwhich terminates at its top in a sleeve a having a central perforation in which is mounted the gclamping-rod B,which may be secured in any position therein by means of a thumb-screw 00?, mounted in a screw-threaded perforation in the side of said sleeve and adapted to impinge at its inner end upon the side of said rod. The central portion of the plate A is cut away and a bar A carrying a sleeve a is pivoted at one end to the under side of said plate A and is secured in the position shown in Fig. 1 by a button a mounted upon the outer end of said plate A and adapted to engage with the edge of said plate A and when turned half round securely lock the two plates together. When in such position, the perforations in the sleeve a and sleeve c are exactly in line. 7

The clamping rod or jaw B is any suitable be held therein in any desired adjustment by the set-screw 0, as before described. Its

lower end orpoint is preferably formed small,

but square, so that it will rest firmly upon the table or cullet of the diamond and bear directly upon its center, or in line with its vertical axis, and its upper end extends above the sleeve to form a suitable handle for manipulation and to which force may be applied in use.

The dop O is in main of an ordinary construction, consisting of a suitable stem having a cup on its end of sufficient size and shape to properly support the metal molded around the stone, and a central stud 0, extending out from the center of said cup slightly beyond its edge, with a suitablyformed seat or rest 0 for the diamond on its end. Said stud c is directly in line with and practically an extension of said stem. The rest or seat 0 I prefer to form in a separate piece and of copper or other metal of like nature, which is soft and permits the edges of the stone to be forced into it slightly, which adds greatly to the security of the position of the stone. It is formed with a shank which sets into a perforation in said stud c, and with a cup-shaped face of that shape and size and with its walls of that angle which will best conform to the size and shape of the stone to rod adapted to fit closely in the sleeve a and be set therein. Each seat is preferably formed with its sides or walls of that angle which will give the stone a rest on its corners near its edge, (indicated in Fig. 4,) thus affording a wide base or seat for its under side, which, with the narrow point or end of the clamping-bar bearing upon its top exactly in the center of the stone and its seat, secures it beyond the possibility of movement. These cup-shaped tips'may in practice be supplied in quantities with seats of different sizes and shapes, the shank of all being of standard size, so that a seat for any-sized stone may be readily provided on any dop.

The mold D is of an ordinary construction, adapted to closely embrace the sides of the cup of the dop when closed thereon, with its sides projecting up above said cup and closing the same, except on one side, as shown. It is pivotally supported on an arm D, which in turn is hinged to a stud D on the side of the curved upright A said arm being of just the length required to bring the two parts of the mold into position to embrace the cup when desired. This arrangement secures said mold where it is always in position to be used conveniently and quickly, and yet permits it to be swung around entirely out of the way when not in. use.

It will be understood, of course, that while the construction described is that whichv has been found desirable, yet I do not limit myself to all its details, which may obviously be i changed or varied in form and arrangement without departing from my invention, as hereinafter claimed.

In operation one of the dops to which it is desired to secure the diamond is placed with its shank in the sleeve 0. in the plate A which plate is then swung to and locked in the posit-ion shown in Fig. 1. One of the softmetal tips 0 is then put in place. The stone to be polished is then placed in the cupshaped face of the tip, with its table and cullet in exact line with the center of the spindle of the dop and the clamping bar or rod B. Said rod is then pressed down upon the upper surface of the stone with force sufficient to press its edges into the soft-metal seat slightly and securely clamp said stone in this position.

The set-screw C03 is then turned tightly against saidrod to prevent it from moving. The plate A is then tilted on the stand so that that portion of the stone which it is desired to expose for polishing shall be brought uppermost, the dop having previously been inserted with the side of the stone in that position which renders thispossible. The in old isthen brought around the top of said dop closely and the metal turned in and allowed to cool, which secures the stone as desired by this old and well-known means. The stone having been thus secured to the dop, the dop is removed andis ready to be placedin a holder or frame for polishing the stone. As each facet is polished, the dops holding them. are

placed in said stand and the stone securely clamped by the clamping-rod, as before described, which holds the stone firmly in its original position and renders it possible to melt the fusible metal, tilt the plate, so as to expose the neXt facet to be polished, and permit said metal to run down into the mold around the remaining portions of the stone and again thus secure it for the polishing apparatus without any danger of its position in its seat having changed and the polishing scheme thereby disturbed. By this means the entire stone,lexcept the small portion of the surface being polished, is embedded in the metal and thus securely held to the dop, v(as has been found to be the only practical way in which a diamond can be held while fbeing polished) while the position of said istone on the dop is not changed during the .polishing of eachside thereof.

Having thus fully described my said invention, what I claim as new, and desire to se- Ecure by Letters Patent, is-

1. In a diamond-polishing apparatus, a ;frame for holding the dop while the stone is being secured thereto, which consists of a iseat in which said dop may be mounted, a clamping-jaw directly in line with said dop iwhen in position, and a mold adapted" to be ,brought around said dop, said several parts ibeing mounted on a tilting frame, substanitially as set forth. 2. In an apparatus for securing diamonds for polishing, the combination of'the dop provided with a cup-shaped seat for the stone, the walls of: which are of an angle to afford ,said stone a rest near its girdle, a stand or frame in which said dop is mounted, and a @clamping jaw or bar arranged directly in line }with the center of said seat with its point to ibear upon the center of the side of the diajmond opposite that resting in said seat, substantially as set forth.

3. In an apparatus for securing diamonds ifor polishing, the combination of a suitable {frame, and a base carrying a seat for the dop iand a clamping-jaw in line therewith, mountjed to be tilted thereon, substantially as set ;forth.

4'. In a diamond-polishing apparatus, the ,combination of the stand, A, the plate, A, @hinged thereto, the plate, A hinged to said plate, A, provided with a sleeve, a the dop "mounted in said sleeve, the standard, A mounted on one end of said plate, A, carry- ;ing a sleeve, (6 ,1116 clamping-bar, 13, mounted ,in said sleeve, and the mold, D, all substantially as set forth.

5. I11 a diamond-polishing apparatus, the combination of the stand,.the tilting frame .mounted thereon carrying a'seat for the diaimond, and a clampingjaw for holding it therein, anda mold hinged to a portion of tially as set forth.

6. A device for holding diamonds while be- In testimony whereof I affix my signature ing secured to a dop, to be polished, consistin presence of two witnesses. ing of a frame having a seat or rest for the dop, and a clamping-jaw arranged in line JOHN EDWARD EVARD' 5 therewith and adapted to bear upon the side \Vitnesses:

of the stone opposite that which rests in said WILLIAM W. HEROD,

(10p, substantially as 'set forth. CARL F. WALK.

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