US902A

US902A - Vertical tooth-extractok

Info

Publication number: US902A
Authority: US
Publication date: 1838-08-30
Anticipated expiration: 1855-08-30

Description

UNITED STATES PATENT onirica.N

DAVID H. DICKEY, OF BOSTON, MASSACHUSETTS.

VERTICAL TOOTH-EXTRACTOR.

Specicaton of Letters Patent No. 902, dated August 30, 1838.

T0 all whom it may concern.'

Be it known that I, DAVID H. Dromer, of Boston, in the county of Su'olk and State of Massachusetts, have invented a new and useful Improvement in Instruments for EX# tracting Teeth, which I denominate Dickeys Vertical Tooth-Extractor; and I do hereby declare that the following is a full and exact description thereof, reference being had to drawings accompanying and making part of this specification.

In the accompanying drawings Figure l represents a perspective view of the instruments entire. Fig. 2, the short plate. Fig. 3, the claws and supporting plate. Fig. 4,

Vthe short" lever reversed exhibiting the springs. Y

I construct mj vert-ical tooth extractors from steel or any other suitable metal, and that part called the tooth-plate is made from a rod of any suitable length and flattened at that end which rests upon the teeth adjoining the one to be extracted, through which flattened part or end an aperture is made suftlciently large to ,admit of the action of the claws on the tooth. On the upper side and near this aperture, connected by a suitable joint is a short lever B, from that end of which directly over the aperture projects two pivots which pass through the claws, and a supporting plate C, on which pivots the claws turn, and are secured by a screw or in any other convenient way. The claws thus situated are made in a circular form, and turn on the above mentioned pivots near their centers on the under side of this lever, near the outer end I attach two springs which extend beyond the outer end, running parallel with the lever, and act upon the inside of the lower extremities of the claws, for opening them when the pointed lever is withdrawn. Directly back of the claws and on the upper side of this lever is 'a projection D through which is an aperture, and on the outer end is a similar projection H, in which is formed a female screw, Through these two projections passes another lever E extending fromthe outer end of the instrument to the claws, that end of which nearest the claws is made pointed and forms a revolving wedge, which point tioned supporting plate is to prevent the ex-V pansion of the claws during the operation.

Modus 0pemndz'.-The tooth plate A `is placed upon the teeth adjoiningthe one to be extracted, with the aperture directly over it, the claws being placed on each 'side are made to adhere by means of the lever E working into the upper ends when the tooth is immediately withdrawn, by contracting the outer extremities of the tooth plate and lever. l/Vhen necessary to extract the tooth farthest back in the jawthe plate A is removed and another F, is placed in its stead the flattened endof which extends only to the claws and thus permits of their action on such a tooth whereas. the other would not.

That I claim as my invention and desire to secure by Letters Patent in the above described vertical tooth extractor is- 1. The lever C working in the female screw, with one end pointed, and forming a revolving 4wedge, for opening the upper parts of the forceps thereby contracting the lower or that part which is made to adhere to the tooth in combination with other parts j DAVID H. DIOKEY.

Witnesses:

JOHN W. HUBBARD,

ABEL GAY.