USRE12143E - Apparatus for s wag - Google Patents

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No. 12,143. v 1 REISSUED :AUG. 11, 1903; B. B. BREWER & w. M. H. BURPEIND. APPARATUS FOR SWAGING GOLD OR'OWNS.

AYPL IOATIOK IILEDIAY 18, 1903.

WITNESSES.-

A TTORNEY.

1N VENT 0R5 UNITED STATES Reissued August 1 1, 1903.

PATENT OFFICE.-

BENJAMIN B. BREWER AND "WILLIAM M. H. BURFEIND, or SAN FRANCISCO, CALIFORNIA,

APPARATUS FOR GOLD CROWNS.

SPECIFICATION forming part of Reissued LettersIPatentNo. 12,143, dated August 11, 1903. Original No. 674.282, dated May 14, 1901. Application for reissue filerlMay 18, 1903I Serial No. 157.625.

To" all whom it may concern.-

Be it known that we, BENJAMIN l ZREWER and WILLIAM M. H.- B RFEIND, citizens of the United States, residing at San Francisco, in

the county of San Francisco and State of California, have invented certain new and useful Improvements in Apparatus forSwag-ing Gold Crowns, of which the following is a specification.

Our invention relates to an Improved swaging apparatus for making seamless contour gold crowns for teeth, and the object of our invention is to make a perfectly-fittingcrown of any desired 'shape,- contour, and occlusion without the use of. solder.

Our invention therefore resides inthe novel construction, combination, and arrangement of parts for the above ends hereinafter fully specified, and. particularly pointed out inthe claims. I

In the accompanying drawings, Figure 1 is a perspective view of the lower section of the casing. Fig. 2 is a similar View of the upper section. Fig. 3 isa similar View of a core used in forming a thimble. Fig, 4 is a sectional view of the core and one of the casing,

sectionsused as a mold to form the thilnble.

Fig. 5 is a sectional view of the parts arranged in position to form a lead casting around the gold cup or crown, and Fig; 6 is a sectirmal view of the parts arranged for swagin'g the gold cup into the required shape.

The nature of our invention will be understood more readily by following in detail the manner in,which we apply the same and by describing thediiferent parts of the apparatus in the order in which they are used in the operation of swaging gold crowns by means thereof. I

Referring therefore to Fig. 2, it will be seen that a represents the upper cylindrical sec-. tion of a casing, having dowel-pins b to fit into recesses c in the lower cylindrical casingsection 61. e is a core frusto-conical in form. Using the part e as a core in the center of the section a usedas a mold, as shown in Fig. 4, a leaden thimble f is cast. This thimble f is now placed in the bottom of the section (7, in which it fits snugly, since it was cast in the section a, whiehds the same diameter as d. The gold cup 9, which is to be swaged, is now placed upon the topof the lead'tliimble f cen trally of'the section (I, as shown inFig. 5. Molten lead or other soft metal is now poured around the gold cup to the upperedge of said cup, a s shown at h, care being taken to prevent the molten lead running over the upper edge of the cup, which may be done by inserting therein astick'of wood I, which about fills the cup. The stick is now withdrawn and there is inserted in the cup in its place the form 1', previously prepared, to which the crown is to be swage'd, and theform is now out off even with the top of the cup, The section a is now fitted upon-the top of the section d by means of the dowel-pins b and recesses c to'serve as a guide for the punch j, through which power is to be applied for swaging the "cup. A disk of'lead k, fitting within the 037-,

lindrical section a, is placed upon the top of the cast lead it and the cup 9, and the end of the punch j is inserted in said section 0; above the disk of the lead k,

The whole of the above apparatus,'s0'a r-.

ranged, is now placed upon a suitable anvil,

and the punch is driven down by a heavy.

hammer until the lead has been compressed or swaged in the cylindrical casing to such an extent that the opening or recess 01 in the leaden thimble f has been completely closed. Then by driving the entire mass out of the casing the lead disk and the thimble f will separate and fall off from the portion h, the gold crown remaining in the latter. By

means of suitably-constructed cutting-nip pers the portion h is split free from the gold crown, which will be found to be accurately ISO .2. Tu an apparatus for swaging dental crowns, the combination of a casing, a yielding support for the crown within the casing, a fo rn1 within the crown, to which it is to be swaged, and an internal jacket of soft meti'i-l cast around the crown, substantially as described.

3. In an apparatus for swag'ing dental crowns, the combination of a casing having a substantially cylindrical chamber, a form within the chamber to which the crown is to be swaged, a jacket of soft metal cast around the crown, and a hollow soft-metal support below the crown, substantially as described. i. In an apparatus for swaging dental crowns, the combination of a casing having a cylindrical chamber open at both ends, a cylindrical plunger fitting snugly in said chamher, a soft-metal support in. said chamber near one end for the crown, a form in the chamber to which the crown is to be swaged 5. In an apparatus .i'or swaging dental crowns, the combination 01": a casing having a chamber open at both ends and of uniform cross-sectionith'ro'ughout, a form within the chamber to whichthe crown is to be swaged, and a jacket of compressible material in the chamber around the crown, substantially as described. y r

G. In an apparatus for swaging dental crowns, the combination of a casing having a chamber open at both ends and of uniform cross-section throughout, a-form within the chamber to which the crown is to be swaged, and deformable material in the chamber,

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