US475940A

US475940A - John hamlin

Info

Publication number: US475940A
Authority: US
Publication date: 1892-05-31
Anticipated expiration: 1909-05-31

Description

(No Model.)

J HAMLIN.

VETERINARY TOOTH CUTTER.

No. 475,940. Patented May 31, 1892.

UNITED STATES PATENT OEEICE.

JOHN HAMLIN, OF IVASHINGTON, DISTRICT OF COLUMBIA.

VETERINARY TOOTH-"CUTTER.

EPECIFICATION forming part of Letters Patent No. 475,940, dated May 31, 1892.

Application filed January 5, 1892. Serial 110,417,092. (No model.)

T0 at whom it may concern:

Be it known that I, JOHN HAMLIN, a citizen of the United States, residing at WVashington, in the District of Columbia, have invented certain new and useful Improvements in Implements for Cutting Off the Teeth of Horses; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to a new and useful improved implement for cutting off the teeth of horses; and it consists of a pair of crossed and pivoted levers and a pair of crossed cutting-jaws loosely connected together by two plates, the rear end of each jaw being pivoted, respectively, to the forward end of each lever in the form of a compound lever, as will be hereinafter more fully described in the specification and particularly set forth in the claim.

It is well known to veterinary surgeons and to others skilled in the art of cutting the teeth of horses that great care must be exercised in cutting off an uneven tooth to avoid crushing or otherwise permanently injuring the teeth and that it is next to impossible to perform the operation successfully with the in struments now in use.

The principal object of the presentinvention is to provide an implement whose cuttzingjaws, when opened and encircling a tooth, will move togetherone in advance of the other-with a shearing cut, so that all danger of either crushing or splitting the tooth is absolutely avoided. This object is obtained by the construction and arrangement of the various parts, as illustrated in the accompanying drawings, in which Figure 1 represents a front plan view of my improved implement with a portion of the handles broken away; Fig. 2, a back plan View of the same, and Fig. 3 an edge view thereof.

Similar letters of reference indicate similar parts throughout the several views.

A A indicate a pair of operating-levers, having curved ends a, which are crossed and pivoted together by a pivot a Said levers are provided with suitable handles. (Not shown in the drawings.)

B B indicate two lever cutting-jaws,which are crossed and connected together by two plates G C. The lever end of the cuttingjaw 13 is loosely joined to the curvedend of a lever A by a pivot a and the lever end of the jaw 13 is looselyjoined to the curved end a of the leverA' bya pivot c The two pairs of levers thus pivotally connected together form a compound lever, by means of which a steady and powerful leverage is attained.

The cutting-jaws arepivoted between the connecting-plates C and O by pivots c c, and each of said jaws is formed with a curved shoulder Z), which, in conjunction with the curved edge 0 of the plate O, permits of a slight oscillatory movement to the lever cutting-jaws when the levers A A are manipulated to cut off a tooth.

It will be noticed that the cutting-edges do not come together when in closed position, but that the points are in closer proximity to each other than the base or heelt;hat is to say, each edge inclines inwardly. The obj ect of this peculiar formation of the cuttingedges is to insure a complete cut through the enamel of the tooth and as far around the latter as is possible.

In using the cutter the jaws are caused to open by spreading apart the levers A A, and the tooth to be out being encircled by the jaws the said levers are closed. In the act of closing the levers one of the jaws, by reason of the peculiar pivotal connection of the plates and jaws and the operating of the levers pivotally connected with the forward In testimony whereof I affix my signaturein ends of the operating -levers, and the conthe presence of two witnesses. nect-ing-plates between which the cutting-jaw levers are independently and loosely pivoted, JOHN HAMLIN whereby one cutting-jaw will move slightly Witnesses:

in advance of the other, substantially as speci- JAMES G. J ESTER,

LEWIS I. ONEAL.