US644970A - Dental flask. - Google Patents

Description

No. 644,970. Patented Mar. 6, I900.

T. G. DUNALDSUN.

DENTAL FLASK.

(Application filed Feb. 6 1899.) No Model.)

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UNTTED STATES PATENT @FFICE.

THOMAS GRAHAM DONALDSON, OF BALTIMORE, MARYLAND.

DENTAL FLAS K.

SPECIFICATION forming part of Letters Patent No. 644,970, dated March 6, 1900. Application filed February 6, 1899. $erial No. 704,731- (No model.)

T 0 all whom it may concern:

Be it known that I, THOMAS GRAHAM DON- ALDSON, a citizen of the United States, residing in the city of Baltimore, State of Maryland, have invented certain new and useful Improvements in Dental Flasks, of which the following is a specification.

My invention relates to improvements in dental flasks; and the objects of my improvements are, first, to provide for the use of dentists a vulcanizing-flask combined with greater strength, durability, and simplicity and one that can be adjusted and taken apart more easily and in shorter time than dental flasks now in use; second, to dispense entirely with bolts and to avoid the necessity or need of a press toolose or fasten the flask, and, third, to provide for equal pressure on all parts of the flask. I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a vertical section through the flask on line A B. Fig. 2 is a top plan view of the bottom section. Fig. 3 is a top plan view of the middle section. Fig. 4 is a top plan view of my flask-holder. Fig. 5 is a top plan view of the equalizing compressor-plate. Fig. 6 is a top plan view of the top section. Fig. 7 is a view in elevation of one of the three links. Fig. 8 is a diminished view of the wrench.

Similar numerals and letters refer to similar parts throughout the several views.

The flask is composed of a top section 4, a middle section 3, and a bottom section 2, in which the middle section 3 and the bottom section 2 are detachably connected together by two pin-and-hole connections 9 10, one on each side of the flask, the pins 9 being securely attached to the middle section 3,which fit into holes 10 in the bottom section 2. The sections of the flask when compressed or onbeing compressed are also held'the more securely by the three links, like the one shown in Fig. 7, passing through the slots 11, 12, 13, and 14.

To compress the flask, I use the flask-holder 1, (shown in Fig. 4,) which is secured to a relatively-permanent part, such as a dentists table a, a fragment of which is shown in the of the linksto pass under the lugs of the bot- I tom section. The flask holder is also provided with recesses a which receive the an .gular portions of the bottom section to pre-' vent rotary motion.

The equalizing compressor-plate 5 is provided with one equalizing compressor-screw 7, having a socket 18 for receiving the wrench 20, by which when the links, Fig. 7, are adj usted, as aforesaid, the equalizing compressor-screw 7 may be turned so as to press uponthe countersink 19 in the top section 4, forcing down the top section 4t against the mid dle section 3 and the middle section 3 against the bottom section 2, and thus compressing the flask.

The equalizing compressor-plate 5 is made, preferably, of gun-m etal,very tough and capa* ble of standing great resistance,and the equal-' izing compressor-screw 7 is so arranged that on being turned by the wrench 20, Fig. 8, is capable of exerting much greater pressure upon the flask than any other character of screw or by screw bolts and nuts as are some times used, is more easily and in shorter time manipulated,- is more powerful than neces sary, and dispenses entirely with the necessity or need of a press to close or fasten it.

I am aware that prior to my invention vul= canizing flasks for the use of dentists have been made with a compressor comprising a top, a bottom, and connecting ends, said top being provided with one or more screw-plugs having a portion adapted for receiving a wrench and capable of being screwed down below the upper face of the top of'the compressor. I therefore do not claim such a 001m bination, broadly; but

What I do claim as my invention, and desire to secure by Letters Patent, is

1. The combination with a dental flask of an equalizing com pressor-plate provided with an equalizing compressor-screw and connecting-links securable to the bottom section of said flask substantially as described.

2. The combination in a dental flask comprising a flask-holder, an equalizing compressor-plate, flask-sections, and connectinglinks with means for compressing said flasksections, substantially as described.

3. An equalizing compressor-plate for compressing the dental flask, provided with an equalizing compressor-screw having a socket for receiving the wrench, said equalizing compressor plate being also provided with grooved lugs for receiving securing-links, and means for tightening the flask parts, substantially as described.

4. The combination in a dental flask comprising a flask-holder, a wrench, an equalizing compressor-plate provided with an equal- .izing compressor-screw and grooved for receiving the upper jaws of the links, and links with means for connecting and tightening the parts of the flask, substantially as described. 7 5. The combination of a dental flask with a compressor comprising a flask holder, a wrench, an equalizing compressor-plate, a top section, a middle section, a bottom section, and connecting-links, the said equalizin g compressor-plate being provided with equalizing compressor-screw with socket for receiving the wrench and with grooved lugs for receiving the upper jaws of the connecting-links; and the said bottom section being provided with l ugs for receiving the enlarged lower ends of the links, for compressing and tightening the flask-sections, substantially as described.

In testimony whereof I have signed my name to this specification, this 3d day of February, 1899, in the presence of two subscribing witnesses.

THOMAS GRAHAM DONALDSON. Witnesses:

ABRAHAM H. FISHER, JOHN P. WAGNER.

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