US696772A - Dental crown-slitting tool. - Google Patents

Description

Patented Apr. 1; F902; a. w. TEUFEL. DENTAL GROWN SLITTING TOOL.

(Application filed Nov. 25, 1901.)

(N0 Model.)

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GEORGE \V. TEUFEL'OF PHILADELPHIA, PENNSYLVANIA.

DENTAL CROWN-SLITTING TOOL.

SPEGIFEGATION forming part of Letters Patent No. 696,772, dated April 1, 1902. Application filed November 25, 1901. Serial No. 83,493. (No model.)

To all whom it may concern:

Be it known that I, GEORGE W. TEUFEL, a citizen of the United States, residing at the city of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Dental Grown-Slitting Tools, of which the following is a specification.

My invention has relation to a dental tool adapted for slitting and removing cap-crowns from teeth; and in such connection it relates to the construction and arrangement of such a tool.

The principal object of my invention is to provide a crown-slitting tool of improved construction which shall be efficient in operation and relatively simple and inexpensive to make.

The nature and scope of my invention will be more fullyunderstood from the following description, taken in connection with the accompanying drawings, forming part hereof, in which- Figure 1 is aside elevational View of a crown-slitting tool embodying main features of my invention. Fig. 2 is a front elevational view of the same. Fig. 3 is a sectional view, enlarged,illustratin g the construction and arrangement of the knife of the tool. Fig. 4 is a similar view of the jaw bearing upon the crown of the tooth, and Figs. 5 and 6 are detail views of the pivotal connection between the two arms or levers of the tool.

Referring to the drawings, ct and b represent the two arms or levers of the tool. The arm Ct carries at one end the slitting jaw or beak A, constructed and arranged as follows:

The arm a is enlarged into a ring or sleeve a,

the bore a of which is conical. A stud a provided on its periphery with a knife a has a stem a, which enters the bore a of the sleeve 0; and is upset thereon to prevent the stud a from being disconnected from the sleeve. The connection of the stud a with the sleeve a is sufficiently loose to permit the stud a and knife a to turn in the sleeve a, whileclamping the inner face of the stud (1 down upon the outer face of the ring a. The position of the knife a may therefore be readily changed, so that in operation it may slit the crown of the tooth on any line along its periphery. The knife-edge projects radi ally from the stud a and extends beyond the periphery of the adjacent ring a, in which the stud and knife turn. The other arm I) is provided with a bearing jaw or beak B, constructed and arranged as follows: The end of the arm, his enlarged into a cup I), the rim or perimeter of which is annularly grooved, as at 17 This'cup fits down upon the cuspid surface of the tooth, and the ridges of the groove Z2 tightly fit upon the crown to prevent the jaw or beak B from slipping off of the crown when the tool is used. The hollow b of the cup b is of a diameter sufficient to permit of the sleeve a, stud a and knife a entering the hollow of said cup 5, the top or point of the knife, however, being in substantial alinement with the inner ridge of the groove 79 In tools of this character it is desirable that the two arms be readily separable, so that the pivot or joint can be washed with an antiseptic substance. One way of making these arms a and b separable is illustrated in the drawings. At the pivotal point of the arms each arm a or b is enlarged into a block a or I), having its upper and-lower curved edges a or b tapered or beveled. This block a or b engages a complemental recess 19 or a in the other arm. When the two arms a and b are turned to the position illustrated in Fig. 5, the beveled edges a and 5 clear the complemental recesses 23 or a and the two arms may be separated. One arm a or Z) carries the pivot-pin a", and the other arm I) or a is perforated, as at 6 to receive the pin.

In operation the two jawsof the tool are separated and the cup I) is fitted down upon the crown of the tooth. The two jaws are then brought together to bring the knife down upon the side of the tooth, While still maintaining the grooved cup upon the crown. The knife then cuts into the side of the tooth as the knife-jaw approaches the bearing-jaw, and the side of the tooth is thus slit from the root toward the crown.

Having thus described the nature and objects of my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a dental tool for slitting cap-crowns, aslitting-jaw comprising an arm, the free end of which is enlarged into a ring, a stud having an inner face resting upon the outer face of said ring, a stem projecting from the stud and entering the center of the ring to form a swivel connection between the stud and ring and a knife projecting radially from the periphery of the stud and having its point projecting beyond the periphery of the ring, and a bearing-jaw cooperating with the slittingaw.

2. In a dental tool for slitting cap-crowns, a bearing-jaw comprising an arm, the free end of which is enlarged into a cup, said cup having its rim ridged to form an annular groove concentric with the interior of the cup, in combination with a slitting-jaw comprising an arm having its free end enlarged into a ring of a diameter less than the diameter of the cup,

a stud having an inner face resting upon the outer face of the ring, a stem projecting from the stud and fitting the center of the ring to form a swivel connection between the stud and ring, and a knife projecting radially from the periphery of the stud and having a point projecting beyond the periphery of the ring and in alinement with the inner ridge of the cup in the bearing-jaw.

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

GEO. W. TEUFEL.

Witnesses:

J. WALTER DOUGLASS, THOMAS M. SMITH.

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