US244031A - campbell - Google Patents

Description

. (No Model.)

J. S. CAMPBELL.

DENTAL VULCANIZING .PLASKS.

Patented July 12, 1881.

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UNITED STATES JOHN S. CAMPBELL, OF NEW YORK, N. Y.

DENTAL VULCANIZING-FLASK.

SPECIFICATION forming part of Letters Patent No. 244,031, dated July 12, 1881.

Application filed June 11, 1881.

To all whom it may concern:

Be it known that I, J. S. CAMPBELL, a citizen of the United States, residingin the city, county, and State of New York, have invented certain new and useful Improvements in Dental Vulcanizin g-Flasks, fully described and represented in the following specification, and the accompanying drawings forming a part of the same.

My invention relates to an improvement in dental flasks; and it consists in the means herein described for closing the flask obliquelyviz., an inclined guide secured to one part of the flask and operating against the opposite part as the parts approximate in closing.

It also consists in the combination of an inclined and perpendicular guide, for the purpose set forth.

In the drawings annexed, Figure 1 is a side view of a flask provided with the ordinary perpendicular guide 9, the entire right-hand side of the flask being shown in central section, to exhibit the mold and the celluloid or rubber blank. Fig. 2 is a plan of the flask shown in Fig. 3, which is a side elevation, showing auxiliary guides applied to the front and rear of the flask. Fig. 4 is a side elevation of a flask provided with removable guides. Fig. 5 is a side View of a flask having the guide-pins bent; and Fig. 6 is apart plan of the same, showing the shape of the guide ear or lug.

In flasks provided with the ordinary guidepins g, (shown in Fig. 1,)the parts of the flask, lettered A A in the drawings are necessarily limited to a movement perpendicular to their parting-line 1. Such a movement is quite appropriate in many cases, but in packing a plate upon an undercut bed, such as is shown at B in Fig. 1., great difficulty arises in forcing the plate (indicated at P) to its proper position between the two parts of the mold shown in section at B and 0. Much difficulty is also experienced in separating the parts B and O by a perpendicular movement, to remove the wax model when the bed is undercut, as at 6, upon one part, and the opposed corner, as at d, is hooked under by the conformation of the model, for in such cases the natural movement of the parts separated would be parallel with the undercut line at e. As the perpendicular guides usually employed do not afford (No model.)

such a movement, the plaster above the undercut part is frequently broken and the mold destroyed. The perpendicular guides also prevent the upper half of the mold, when formed with a hooked corner, as at d, from hearing equally upon the blank plate P and pressing it into uniform contact with all parts of the bed B. Upon the contrary, the corner (I bears forcibly upon the blank at its front side and pushes it backward as the mold closes, in consequence of which the front part of the mold is imperfectly supplied with material for a perfect plate, while the rear part is overcrowded with an excessive amount.

My invention obviates these difficulties in operating upon undercut models by providing the flask with an inclined guide in place of the perpendicular ones heretofore employed, the inclination of the guide enabling the operator to execute all ordinary work with equal ease, while it affords him special facility for treating unusual cases.

My improved flaskis'also especially adapted for the production of rubber plates inlaid with celluloid upon the front, as in such work a movement of the cover 0 and the blank P toward the undercut face 0 affords a greater pressure at that particular point, and secures a closer union between the two substances forming the plate.

It is obvious that an inclined guide could be obtained by merely tipping the guide-pins g toward the front of the flask and inclining the lugs h at a similar angle; but as it is desirable to have the final movement of the cover A perpendicular to the bottom A, it is preferable to have a guide capable of producing or aifording both such movements; and I have therefore shown three modes of constructing theinelined guide to secure an oblique movement of the cover until the flask is nearly closed, and then to permit the action of a perpendicular guide, by the aid of which thefinal pressure is more uniformly distributed than if the cover moved to its final position in an oblique direction.

In all the figures the inclined guide is lettered a, and the perpendicular guide I), and the two are separately applied in the view shown in Fig. 3, and combined in the constructions shown in Figs. 4: and 5. In these three views the flask is represented as partly opened, or ready for the pressure in the vulcanizer. Under such conditions the top part of the flask, A, is shown moved a little to one side of the bottom, A, and the top is shown in contact with the upper end of the inclined guide. This guide is shown in Fig. 3 as a stud projecting from the side of the bottom part, A, and beveled or inclined at an angle to the joint in the flask at 1. Two projecting pins, 2', upon the upper part, A, embrace the stud a, and guide the top of the flask as it moves downward when closing, and similar pins f embrace a perpendicular stud, b, at the opposite side of the flask to keep that side in position, and to guide the flask perpendicularly when it is nearly closed.

It is obvious that with this construction the flask may be moved perpendicularly during its entire closing movement, for the pins embrace the studs only upon two sides, so that the flask may be slid backward when first adjusted in contact with the rear pin, 1), and be guided by that instead of the inclined one a.

Short guide-pins fitted in cars upon the flask, similarly to those shown at g in Fig. 1, maybe used, in connection with the inclined guide, to direct the last part of the closing movement.

In Fig. 4 both guides are combined in a single round pin, which is constructed to operate upon lugs h similar to those in Fig. 1; but the pin is adapted to furnish an inclined guide by having its rear side beveled or inclined to the desired angle. A part of the pin near its base is left cylindrical, to afford a perpendicular movement to the flask at that point, and the hole in the upper or guide lug, h, is properly fitted to the cylindrical portion. In the figure the upper half of the flask A is shown moved forward, with the rear part of the hole j in contact with the inclined side of the pin; but it is obvious that the hole could be placed in contact with the perpendicular side of the pin, if desired, to close the flask perpendicularly. The pin is shown screwed into the lower lug, h, for convenience of removal when opening the flask upon the wax model; but as the removable pin has been made the subject of a. separate application by me, I have not claimed it herein.

In Fig. 5 the inclined and perpendicular guides are shown united in a bent pin, a, secured to a lug upon the part A and bearing upon a lug, h, on the part A, the lug havinga slot, a, formed in its 'front side, toembrace the pin like the pins z' in Fig. 3.

From the above description it will be plain that my inclined guide may be applied to a flask so as not to interfere with a perpendicular movement when desired, and that it may be combined with a perpendicular guide, either in the same piece or one attached elsewhere upon the flask.

In Fig. 5 the perpendicular guide is shown as an ear or pin projecting upward from the lower lug, h, to operate against the rear of the lug containing the slot 0; but it may be arranged elsewhere or dispensed with entirely, if preferred.

I do not therefore limit myself to the precise construction shown,as other modes of carrying it out may be devised; but

I claim my invention as follows:

1. In combination with a two-part dental flask, an inclined guide secured to one part of the flask and operating to move the other part obliquely to its final position when closing, substantially as and for the purpose set forth.

2. The combination, in a two-part dental flask, of an inclined guide, as a, and a perpendicular guide, as b, the two guides operating to direct the flask when closing, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JOHN S. CAMPBELL.

Witnesses:

J 0s. A. CRISTADORO, THos. S. CRANE.

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