US849297A

US849297A - Dental swaging device.

Info

Publication number: US849297A
Application number: US28753205A
Authority: US
Inventors: George J Weber
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-11-15
Filing date: 1905-11-15
Publication date: 1907-04-02
Anticipated expiration: 1924-04-02

Description

No, 849,297. -PATENTED APE. 2,1901. E. J.' wEEEE.

DENTAL swAGING DEVICE.

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GEORGE J. WEBER, OF LIBERTY CENTER, OHIO.

DENTAL SWAGING DEVICE;

Specification of Letters Patent.

Patented April 2, 1907.

Application tiled November l5, 1905. Serial No: 287,532.

T0 @ZZ whom t may concern.-

Be it known that I, GEORGE J. WEBER, a citizen of the United States of America, residing at Liberty Oenter, in the county of Henry and State of Ohio, have invented new and useful Improvements in Dental Swaging Devices, of which the following is a speciiication.

This invention relates to improvements in dental swaging devices for forming metal dental plates, and has for its object to provide a simple and effective construction of swaging device whereby the operation of making dental plates is simplified and whereby the plate may be finally swaged or iinished on a plaster cast or model, so as to insure an accurate fit.

In the drawings hereto annexed and forma part of this specification, Figure l is a side elevation of the swaging device. Fig. 2' is a central vertical section thereof. Fig. 3 is a top plan view. Fig. 4 is a bottom plan view of the plunger with the die applied thereto.

The swaging device comprises two main parts or members-to wit, a cup l and a diecarrying plunger 2-both of which conform in outline to the general contour of the type of plate to be produced. The cup l is preferably formed of steel, cast-iron, or some other strong and durable material. It has a fiat bottom 3 and a body-wall 4 rising therefrom to form a socket or chamber of a desired depth. The plunger 2 consists of a block or body of steel, cast-iron, or other durable material and has its upper portion suitably reduced and terminating in a socket 5 to receive a concussion-head 6, which receives the blows of a hammer or mallet in the swaging opera-tion. This head may be made of metal, but is preferably constructed of hard wood, so that if the one in use should be broken or mutilated it may be conveniently withdrawn and a new head substituted there- The lower face of the plunger 2 is formed with a chamber or recess 7 to receive a die holder and backing 8, consisting of some suitable material that is hard at normal temperature and capable of being softened by the action of hot water or a low degree of heat. The die 9 comprises a body having a plane or flat back or rear face and an acting or impression surface l0, conforming in contour to the shape of the plate to be swaged. This die is embedded and held in the backing 8. In the operation of inserting the die the backing 8 is softened to the desired extent by the aid of heat, the back portion of the die forced therein until embedded to the desired extent, and the backing allowed to set or harden under normal temperature or hardened by submerging the plunger andd'ie in cold water. After the die is embedded in the backing the projecting rim edges of the latter are trimmed down flush with the lower face of the rim of the recess 7 and dusted with soapstone to aid in separating it from the cup in a later operation. f

The body of the plunger is adapted to fit snugly within the cup l, and within the latter is a counter-die 11, formed of some suitable plastic material which, like the die-backing 8, may be softened by the action of hot water or a comparatively low degree of heat.

In the operation of preparing the parts for use a plaster cast or model of that portion of the mouth of the patient to which the plate is to be fitted is made, and from this cast or model a die of metal fusible at a low heat is prepared. While the plaster model and die are being made the lastic material forming the die-backing and? counter-die body may be and preferably are being subjected to a softening process by subjecting them to the action of heat. The softened plastic material is then worked into suitable shape and placed in the cup and die cavity in the plunger and the die applied to the plunger in the manner previously described. While the plastic material in the cup is still in a softened state the plunger carrying the die is then inserted therein and the plunger subjected to one or more blows from a hammer or mallet to force the die into the plastic counter-die body, thus converting the latter into a counter-die, as will be readily understood. The plunger is then removed from the cupv and the counterdie allowed to harden or plunged into cold water to harden it quickly. This operation of hardening the plastic material may, however, be accomplished by putting the entire swaging device into cold water and removing the plunger after the plastic material has become completely hardened. A plate-pattern is then cut from-sheet aluminium, gold, or platinum, according to the material to be used, and roughly shaped into form for convenient application to the die, and this plate is then annealed or softened by heating', placed over the die, and approximately shaped to the latter by means of a mallet. A thin IOO IlO

sheet of r-ubber 12 is laid over the plate applied to the die or suitably interposed in any other suitable manner between the plate and counter-die when the plunger is inserted in the cup for swaging. After the plunger is inserted in the cup the plunger is subjected to a desired number of blows from a mallet or hammer to shape plate into the approximate form. Thel plunger is then removed from the cup, the sheet of rubber permitting ready separation of the plate from the counter-die, and the plate is now found to be nearly completely swaged. After the plate is removed it is trimmed to the outline it is to have and is again annealed and subjected to a second swaging action in the manner before described. This operation may be carried out quite a number of times until approximatelyT the exact shape is secured, and in many cases this may be found sufficient for the purpose but where it is desired to have the plate accurately conform in every particular to the contour of the plaster cast or model I subject the plate to a finishing operation in the following manner: The counter-die is softened by the aid of heat without changing its contour, and the plate and die are then applied with the interposed sheet of rubber as before and the plate again swaged. In this act-ion, as the counter-die is now in a plastic condition, it forms a working anvil-body and forces the plate into all the undercuts that the die may have. After this treatment the plate is practically perfectly swaged to the die; but in order to secure extreme accuracy of shape the plaster model may now be used as a die, and as the counter-die material is soft the model may be used for the final operation without danger of breaking or injuring it.

Where a large number of plates are to be produced and dies have been previously prepared, the operation may be conducted with great rapidity, and as the several swaging operations with the die proper will under all ordinary circumstances yield excellent results the finishing stage or step of treatment need not be adopted unless an absolutelyperfect contour of the part of the mouth of the patient to which the plate is to be applied must be made, in which event such final treatment will, it is apparent, yield the desired result.

It will be observed that the apparatus is simple, cheap, and effective in construction and provides a means whereby dental plates may be easily and conveniently swaged with any desired degree of accuracy and that as the die rests against an immovable backing, on the one hand, and the plate against a yielding surface, on the other hand, a slight resiliency is afforded which facilitates the operation of shaping the plate'to .the exact contour of the die. It will of course be understood that the metallic parts of the apparatus may be nicl el-plated to prevent rusting and that other changes within the scope of the invention may be made without departing from the spirit thereof. It will also be apparent that by preparing the counter-die body and anvil-backing for use by subjecting them to heat while the plaster cast and die are being prepared the period of operation bctween the initial and iinal stages ol treating the plate may be considerably reduced.

It will of course be understood that the invention contemplates as a modification the reversal of the parts of the device-that is, that the lower part or member of the swager, herein termed the cup, may be employed as the die-carrier, while the upper part, herein termed the plunger, may be'chambered to receive the counter-die material.

Having thus described the invention, what I claim is-- A dental-plate-swaging device comprising a cup, a counter-die of plastic material therein terminating below the upper edge of the cup, said die being provided with a forming cavity and a plane marginal seat-face between the same and wall of the cup, a plunger adapted to 'fit at its lower end in the upper portion of the cup and provided with a recess of greater width and length than said forming-cavity, a die-backing seated in said recess and composed of non-metallic substance capable of being rendered plastic at a low degree of heat, a low-fusing, base-metal die partially embedded in the backing, said die being fusible at a higher degree of temperature than the backing and adapted to approximately fit the forming-cavity, whereby a portion of the backing surrounds the die, said portion being trimmed flush with the lower edge of the plunger to form a plane marginal seat-face around the die, and a sheet of resilient material free from connection with the dies and adapted to be interposed between the plate and wall of the counter-die, said sheet being of proper dimensions to cover the plate and the said seatfaces of the die and counter-die, whereby a uniform, maximum cushioning action is secured in the operation of swaging a plate, substantially as described.

In testimony whereof l aix my signature in presence of two witnesses.

GEORGE J. WEBER.

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