USRE7272E - Improvement in vulcanizing apparatus for dentists - Google Patents

Description

.J. L. McDERMUT, decd G. E HAYES, G. B. SNOW, T. G. LEWIS, J. E. ROBIE and J. Q BRADT, Assignees of EMILY A. McDERMUT, Administr atrix.

VULCANIZING AFPA. .ATUS FOR DENTISTS.

No. 7,272. I 'Re issuefi Aug. 22, 1876.

. Falgf/ f J5 I I 5 0 n lzsaes;

by placing and confining containing the said material in a close or covcred vessel, and subjecting the mold and ma dental plate until ,UNITED STATES;

PATENT OFFICE.

GEORGE E. HAYES, GEORGE B. SNOW, THEODORE G. LEWIS, JOHN E. ROBIE,

AND JAMES Q. BRADT, OF BUFFALO, NEW YORK, ASSI A.M0'DEBMUI, ADMINISTRATRIX OF JOHN L. MGDERMUT, DECEASED.

IMPROVEMENT IN VULCANIZING APPARATUS FOR DENTISTS.

Specification forming part of Letters Patent Nor 44,541, dated October 4, 1864.; reissue No. 7,272, dated August 22, 1876 application filed May 10, 1875.

To all whom it may concern: Be it known that J OHN L. MoDERMU'r, de-

ceased, late of the city of New York, in the State of New York, heretofore invented a new and useful Process of and Apparatus for Molding and Vulcanizing Dental Plates; and the following is declared to be a full, clear, and exact descri-ption of the said invention, reference being bad to the accompanying drawing, which forms part of this specification, and in Figure 1 is a vertical centrai section of an apparatus embodying this invention, one of the flaskshcing shown inside elevation. Fig.

,of the upper'sec-tion of the flask containing a plaster cast or mold the reverse of that shown in Fig. 4., r

This invention consists in a new method or process of moldinga dental plate from a material which may be rendered plastic by heat, the mold or flask terial contained therein, while so confined, to the. combinedandcontinuous influences of heat and mechanical pressure until the material is softened and the mold closed. It also consists in the process of molding and vulcanizing a'vul'canite dental plateinsidea steanr tight vessel by a continuous operation-that of molding being performed as above after whichthe plate so molded is allowed to remain suflicie'ntl y lon g inside the vessel to be properly vulcanized, all without the necessity of handling orchanging the position of the finished. It also consists in the combination, with a close or covered vessel, and a dental mold or flask contained therein, of a mechanism by which the flaskis closed while confined within the said vessel, and without strain-upon the "essel itself from the force applied for the purpose, and simulstated,

taneously with the continued application of heat for the-purpose of softening and rendering plastic the material contained in the mold,-

'ducin g a gradual-pressure upon the flask, and

closing. inns the. materialcontained therein yields by the application of heat, and a closed or covered vessel, in which the flask and its yoke or cage are contained, and by which the applied heat is concentrated and rendered more equable. It also consists in so construct ing a steam-generating vessel that two flasks maybe placed therein sideby side, and on the same level, so that two sets of teeth may lie-molded and vulcanized under the same influences of temperature during the process of vulcanization, thereby insuring equal hardness in both.

In the accompanying drawing, a designates the body of the vessel, and b the cover thereof, which latter is shown as secured to said vesselby bolts 0, passing through flanges, as will, by reference to Fig. 1, be more fully understood. .The vessel a may be oblong; oval, or other suitable shape. An oblong vessel for holding two flasks side by side is shown. (See Figs. 1 and 2.) t I f Attached to the cover b is a thermometer and case, d c, of the usual construction. The vessel to b is shown as supported by a heating apparatus, q,

through the pipe 8, the amountot' heat required being regulated by the cock s. In Fig. 3 the heating apparatus is shown as inverted, and as exhibiting holes win the bottom for supplying air, a perforated top plate through which the mingled airand gas pass burning on the upper side thereof, and an unperl'orated or distributing plate,,t, for spreading the-flame, shown indotted outline.

The. flasks j j shown as closed in Fig. 1)

GNEES OF. EMILY it also consists of the comsupplied with gas are eomposed'of a lower part or section for containing the plaster cast for forming the obverse side of the plate, and an upper part or section for containing the plaster cast for forming the reverse side' of the plate; The space within the mold-l l determines the shape and form of the dental plate or projections fy extending inwardly from.

the vessel, at or near the bottom thereof. Instead .of the long frame justdescrlbed,.two shorter or single. fralnescan be'ernployed.

- i t designate screws, which pass through sockets in the upper part of the frame h, so

as to determine and regulate the pressure employed for closing the flasks for molding the? materialiwhen softened) of which the dental plates are composed. In order to obtain an automatic means for closing the flasks while eonflnedin the vessel to by the cover Z), and as the material composing the dental plate is softened by the heat applied, there are provided the fiat springs 7c, whose outer ends bear uponannular projections 0 onthe covers of the flasksjj. Each regulating-screw is so arranged that its lower end will press aspri u g, it, against the top of a flask. It will therefore be seen that the amount of pressure or power which it is designed or desired to use for the purpose of closing a flask inside the vessel '11 b may be regulated by operating a regulating screw, 41. 1

In forming a dental plate the flask containing the mold and material for the dentalplate is placed inside the flask-holding frame, which latter is placed inside the vessel apand the cover I; closed. Upon siiflicient heat being applied, the material of which the dental plate is to be formed will be softened, and, the flask closing upoir it, it will be pressed or molded in a perfect manner.

By interposing packing between the flanges of the vessel a and its cover I) it will be rendered steam-tight, and the plate, if of vulcanizable gum, being molded, as before described, may be also hardened or vulcanized before its removal from its position by allowing. it to remain a sufficient length of timeiu the vessel, and at a proper heat. I

Itis well-known'th at dental plates have'been ymoldedby the process of injection or filling the -n1old while closed with a fluid or semifluid materiahr'which afterward forms the plate but in such case the mold has been inserted into the heater ina closed condition.

Having thus describedthe invention of the said, JOHN L'. McDnRMU'r,' what is claimed, and desiredto be secured by Letters Patent, 1s-

i 1.- The within-described method or process of molding adental plate byconfming them'old and material therein contained, out of which thedental plate is to be formed, in a close or covered vess-el, and subjecting them, while so confined, to the combined and continuous influences of heat and mechanical pressure until the material issoftened and the mold closed, substantially as hereinbefore set forth.

, 2. The within-described method or process of molding andfvnlcanizing a dental plate by a continuous operation, consisting in closing the dental flask inside a steam-generator,

thereby molding the plate, and then subjecting the plate so molded to the usual vulcanizing process without changing its position inside the generator, substantially as hereinbet'ore set forth. p r s v 3. The combination, with a dental flask,-'of

a yoke or frame, an interposed spring, and'a- I regulatingscrew, whereby pressure upon the spring is adjusted, substantially as described.

4:. The combinationof. a dental flask,-a' yoke or frame encircling the flask and bearing upon the same through an interposed 'spring,sub

stantially as described, thereby closing the v flask when inclosed within a heating-vessel.

5. The combination, with an'oval, oblong,- or other shaped vessel, of two flasks placed side by side on the same level in a double or two single clamping -'fra mes, whereby two' dental platesmay be "subjected to like influences of temperature during-the-process, of

vulcanization, substantially as 'hereinbefore --set forth.

' GEO. E; HAYES.

. GEO. B. SNOW.

THEO. G. LEWIS, JOHN E.; ROBIE. JAMES Q. BRADT.

Witnesses: v p WILLIAM GRANT,

CHAS. ROTHERS. I

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