US61174A

US61174A - Improved vulcanizing flase foe dentists

Info

Publication number: US61174A
Authority: US
Publication date: 1867-01-15
Anticipated expiration: 1884-01-15

Description

@f tstrs vsiwt @fitte LEVI W. DOWLIN, OF SHERBROOKE, CANADA EAST.

I Letters Patent No. 61,174, elated Jam/,ary 15, 1867.

IMIBOVED VULCANIZING PLASK FOB. DENTISTS.

@tige tlptni nient tu iu tlg-rse @hitters ntett amt mating mi nf tige 5mm.

TO ALL WHOM IT MAY CONGERN:

Be it known 4that I, L. W. DOWLIN, nown` residing in Sherbrooke, in thecounty of Sherbrooke, Cana-da East, have invented an improved Vulcanizin'g Flask for packing rubber around artificial teeth; and do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying draw-4 ings, making part of this specification- Figure l being a side view of the tlask.

Figure 2, a bottom view thereof.

Figure 3, a central verticalsection thereof ina plane, indicated by the line rex, iig. 2.

Figure 4, a bottom View of the upper part.

Figure 5,a bottom view of themiddle part.

Figure 6, a top view of the lower part of'the flask.

Like letters designate corresponding parts in all of the figures.

Instead of a single part, as C, in which the die is formed, and into which the teeth and rubber are placed and packed by Aforcing a cover down upon the said die part as in ordinary asks, I employ a separate middle'part, B, and a counter-die part, marked A, in addition to the die part C. The teeth or blocks D D are set in the middle i'lask part B,4 and then the two parts B and C are brought together and secured by two screw-bolts L and nuts t' z'. The rubber is placed in over.. die part C, around the teeth D D, being carefully packed around the rivets dd. Then the counter-die part A is gradually forced. down upon all by means of screwebolts fff, screwing into screw-lugs g g, or secured by nuts, until the rubber is completely shaped and packed. Several important advantages are accomplished by this construct-ion of the ask over those heretofore in use. First, there is never any fear or danger of having too much or too little rubber, as in the common flasks, in which there is no remedy in either case; for in this, by using a small excess of rubber, that surplus, is forced out by pressing down the top part A, or else the said part is left partly open, and still makes the ,packing complete; whereas, in the old form, the two parts must be brought together, or else the teeth are not set in place in the die.. Second, there is no danger of breaking or displacing the teeth by this, since they are tted in the die part before the packing in of the rubber, Aand the pressure is applied. Third, there is no danger of breaking the ask or any part thereof` in screwing the parts together, since there is no obstacle which impedes the bringing together of the parts, and there is no quick Wearing out of the screws, as is the case when so much force has'to be applied in the usual manner. Fourth, there is never any necessity of grinding o' the teeth to make a tit if the parts are not brought completely together, as is vthe case with the common flask; for in this the position of the teeth is exactly determined by uniting the parts B and C ,before the packing of the ruber is done. Fifth, there is a large saving of rubber, since all the surplus is pressed out and saved, but not so with the ordinary flasks. Sixth, every particle of wax is readily removed from the rivets of the teeth with this fiask; since they are readily reached and operated upon.

What I claimas my invention, and desire to secure by Letters Patent, is

The employment of the middle part B of the iiask, substantially as and for the purpose herein specified.

I also claim the separate union of the parts B and 'C before the rubber is packed in by means of screw-bolts h or their equivalent, substantially as and for the purpose herein set forth.

I also claim the combination and arrangement of the counter-die part A with the parts B and C, substantially as herein speciiied. g K Y The above specification of my improved vuleanizing ask signed by me this eighth day of Novenmber, 1865.

LEVI W. DOWLIN.

Witnesses:

A. J. WooDwARD, J. G. ROBERTSON.