US554844A - Dental forceps - Google Patents

Description

(N0 Model.) 2 Sheets-Sheet 1.

S. A. STIENBARGER. DENTAL FORGEPS.

-No. 554,844. Patented Feb. 18, 1896.

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INVENTOf? BYQMMM V6 ATTORNEYS,

2 t e 8 h S m e m S 2 R E G R A B N E T T S A S (No Model) DENTAL FORGEPS.

PatentedFeb. 18, 1896,

. WITNESSES:

INVENTOH ATTORNEYS.

NITED STATES PATENT OFFICE.

SHELDON A. STIENBARGER, OF AUGUSTA, ILLINOIS.

DENTAL FORCEPS.

SPECIFICATION forming part of Letters Patent No. 554,844, dated February 18, 1896.

Application filed August 21, 1895.

To all wh'om it may concern.-

Be it known that I, SHELDON A. STIENBAR- GER, of Augusta, in the county of Hancock and State of Illinois, have invented certain new and useful Improvements in Dental Forceps, of which the following is a full, clear, and exact description.

This invention relates to forceps for extracting teeth, and the object is to provide forceps. having improved means connected therewith by which a tooth may be drawn directly out, or without moving the tooth laterally, as is usually done, thus preventing an excessive laceration of the gum, rendering the operation comparatively easy for the operator and less painful to the patient.

The invention consists in the construction and novel arrangement of parts, as will be hereinafter described and particularly pointed out in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a top plan'view of forceps embodying my invention. Fig. 2 is a side view thereof. Fig. 3 is abottom plan view. Fig. 4 is a partial elevation and partial longitudinal section. Fig. 5 is a view in perspective of a certain detail hereinafter more fully described, and Fig. 6 is a section on the line 6 6 of Fig. 4.

The forceps proper may be of the ordinary kind, comprising the handles A and the jaws A, pivotally connected together in the usual manner. A is a curved rod having pivotal connection at one end with one of the handles, as at a, and having its opposite end passed loosely through an opening a in the opposite handle. The curved rod also passes loosely through openings in the bifurcate end of a bearing plate or bar A which at its opposite end has a projection a engaged over and upon the handles A at their pivotal junction, and a projection a engaging the under side of the same.

To hold the bar A properly centered with relation to the handles and yet allow it a slight longitudinal movement when the handles are moved toward or from each other, I have provided the projection with a slot or notch 60 Serial No. 560,050. (No model.)

adapted to embrace the pivot a of the forceps, and at the rear end springs a surround the rod A between the handles A and the bar A these springs also serving to force the handles apart.

The under side of the rod A is provided with a series of teeth of, between which a projection at on the reduced portion of a lockingdog A may be moved to secure the handles or jaws in the desired closed position. The locking-dog is inovably secured on the handle by means of headed pins or screws a extended from the handle through a slot a in the body portion of the locking-dog, and preferably this locking-dog is of spring material so as to yield slightly at its reduced portion.

B is the fulcrum-plate, having at its rear end a lug b, pivotally connected to the curved rod A between the bifurcate portions of the bar A and having its free end extended to the under side of the jaws A just inward of their downward curve. A pin b extends from the forceps through a hole in the fulcrumplate, and acoiled spring 6 between thehead of said pin and the plate serves to hold the plate closely against the forceps, but allows the forceps to swing relatively to the plate when operating on a tooth, and to allow the fulcrum-plate to lie closely against the forceps I provide its upper side with a depression or recess into which the projection a of the plate A may extend.

The free end of the fulcrum-plate is pro.- vided with a cushion b of yielding material such, for instance, as leatherand the cushion is removably attached to the fulcrumplate. For this purpose I have shown a metal plate I), to which the cushion is attached, and this plate is provided at opposite sides with inturned lugs b adapted to slide and engage over the beveled edges of the fulcrum-plate. In some instances it may be necessary to employ a cushion of soft rubber transversely concaved on its under side, as shown at b in Fig. 5.

O is a rotary cam mounted to turn on the upper side of the fulcrum-plate B and having opposite cam-surfaces c 0, each being inclined upward and outward from the center and adapted to engage against the under side of the plate A A lug 0 extends downward from the cam through an opening in the fulcrum-plate, and a lever G is attached to the lug preferably by means of a pivot 0 so that the lever may be folded or swung closely against the forceps.

In using the instrument the jaws thereof are engaged with the tooth to be extracted, with the cushion b resting 011 the next adja cent tooth. Then by turning the lever 0 latorally in either direction the cam C will rock the forceps relatively to the fulcrum-plate, as indicated in dotted lines in Fig. 4:, and draw the tooth in a substantially straight line and without lateral pressure. In case there is no tooth next to the one to be extracted the softrubber cushion I) may be employed to rest upon the gums.

Having thus described my invention, I claim as new and desire to secure by Letters 5 Patent- 1. In combination with dental forceps, a fulcrunrplate pivoted thereto, and a rotary cam mounted to turn on said fulcrum-plate, and adapted to rock the forceps relatively to the fulcrum-plate, substantially as specified. j

2. In combination with dental forceps, a spring-pressed fulcrum-plate pivotally connected thereto and provided with a cushion, a bearing bar or plate having pivoted andf sliding connection with the forceps, a rotary cam having opposite cam-surfaces, and a le- 1 "er for moving the cam to rock the forceps relatively to the fulcrum-plate, substantially as specified.

3. In combination with dental forceps, a rod having pivotal connection with one handle of the forceps and passing loosely through an opening in the other handle, the fulcrumplate pivoted on said rod, a bea1'ing-ba1','pivoted on said rod and having a sliding connection with the forceps, an operating-cam and a lever extended therefrom, substantially as specified.

4. The combination with dental forceps, of a fulcrunrplate, a cam for rocking the forceps, a curved rod pivoted to one of the forcepshandles and extending through an opening in the other handle having sliding engagement l therewith, and a locking device slidably mounted 011 one handle and adapted to be engaged between rack-teeth on said rod, sub- 1 stantially as specified.

5. The combination with dental forceps, of the curved rack-rod, the locking device therefor, the bearing-bar pivoted on said rack-rod, the fulcrum-plate also pivoted thereon, the springs on the rack-rod, the double cam, and the lever pivoted to the cam, substantially as specified.

SHELDON A. STIENBARGER.

\Vitnesses:

STERLING P. Lennon, Rom. E. HENRY.

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