US1216514A - Dental pliers. - Google Patents

Description

S. J. SYMMONS.

DENTAL PLIERS.

APPLICATION FILED AUG-10.1916.

1 36,511. Patented Feb. 20, 1917.

UNTE

SAMUEL J. SYMMONS. OF OAKLAND, CALIFORNIA.

DENTAL PLIEBS.

Application filed August 10, 1916.

To all whom it may concern:

Be it known that I, SAMUEL JAMns SYM- MoNs, a citizen of the United States, residing at 423 Central Bank Building, Oakland, in the county of Alameda and State of California, have invented certain new and useful Improvements in Dental Pliers, of which the following is a specification.

This invention relates to dentistry and particularly to pliers, the said invention being primarily of utility in connection with the removal of crowns without damaging the said crowns.

The primary purpose of the invention is to provide device by which the crown may be loosened and removed without its distortion, thus enabling an operator to replace the crown after treatment of the tooth and particularly after attaching bridgework to the crown. According to practice now commonly followed, diliiculty has been experienced in installing bridgework and where the abutment orjsupport of the bridgework constituted a crown, it has been necessary to split the crown to efiect its removal, thus making it necessary to make a wholly new crown with the bridgework attached.

By the use of the present invention, the crown is loosened and removed and bridgework may then be secured to it and the crown may then be restored as it was placed in the first instance, resulting in very material saving as compared with the old method.

A further object of the invention, therefore, is to provide novel means whereby the crown may be held while it is rolled or manipulated to disintegrate or break the ocment by which it is anchored, the said crown being then gripped and removed without inury.

With the foregoing and other objects in view, the invention consists in the details of construction, and in the arrangement and combination of parts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to the accompanying Specification of Letters Patent.

Patented Feb. 20, 1917,

Serial No. 114,160.

drawings forming part of this specification wherein like characters denote corresponding parts in the several views and in which- Figure 1 illustrates a view in elevation of a dental tool embodying the invention;

Fig. 2 illustrates a sectional view through the rollers on a shank, the said shank being in elevation;

Fig. 3 illustrates an end view of one of the rollers;

Fig. 4 illustrates an end view of a jaw adapted to coact with the rollers;

Fig. 5 illustrates a sectional view of a shank with the roller coacting element applied thereto; and i Fig. 6 illustrates a slight modification with respect to the shape of the shanks of the tool. 7.

In these drawings 7 denotesa plier like structure in which there are two handles pivoted together for operating shanks 8 and 9 to bring them closer together or to move them apart and as the construction of the handle and the means by which they communicate motion to the'shanks is immaterial as to detail they are not specifically illustrated or described, it being understood that any appropriate means may be supplied for accomplishing the result stated. The shank 8 has a spindle 10 projecting from its end and rollers 11 are mounted to rota-teen the said spindle, said rollers being held in place by a nut 12.

The shank 9 has a threaded extension 18 on which a jaw 14 is mounted, the said jaw being provided with threads 15 to engage the threads of the extension 13 and the said jaw is further provided with a threaded aperture 16 to receive the set screw 17 by which the jaw is held at different positions of adjustment. The jaw 14 has a recess or cavity 18 which, in outline, approximates the contour of a tooth so that when the jaw is applied to the crown of the tooth, frictional contact is insured which will prevent slipping, under certain conditions, as when the crown is to be taken 01?, but the wall of the cavity is smooth so that it may slide on the crown as when-the instrument is turned on the crown-t eifect disintegration'of the cement which holds the crown in place. 7

It has been found in practicethat when the instrument is applied to a crown and gently'rotated'or twisted, the rollers per- :form an action akin'to kneading, the pressure being slight but suflicient to disintegrate or crush the cement for the purpose stated. 7. V

In Fig. 6, the shankA is of the same construction and handles are provided for opf erating the shanks as'heretofore described,

the modification consisting in having the spindle '13 set at'an angle with relation to thejshank, it being understood that the .ex-.

tension of the modification which correfor the purpose intended. It has also been found desirable in practice to have a plier provided with spindles and extensions which stand at an angle with relation to the shanks V opposite to the angle at which the spindle in Fig. 6 extends, as by this last mentioned .modifica'tion the instrument is of greater utility in connection with the back of molar teeth. on the opposite side of the mouth. In other words, the instrument is of greater utility when made in what may be termed right hand and left hand construction, meaning thereby for use on the right hand side and .on the left hand side of the mouth,

whereas the instrument shown in Fig. 1 will be of special utility in connection with use on crowns intermediately positioned.

While the form of invention herein shown and described is what is believed to be the preferable embodiment thereof, it is nevertheless to be understood that minor changes may be made in the form, proportion and details of the construction without departing from the spirit and scope of the invention as hereinafter claimed.

What is claimed as new is 1. In a dental instrument, shanks having means for their manipulation, a spindle on one of the shanks, rollers mounted to rotate on the said shank, a threaded extension on the opposite shank, a jaw having a cavity or recess adapted to coact with the rollers, and means for holding the jaw at different positions of adjustment.

2. In a dental instrument, shanks having means for their manipulation, a spindle on one of the shanks, rollers mounted to rotate on the said spindle, an extension on the opposite shank, a jaw having a cavity or recess adapted to coact with the rollers, and means for holding the jaw at different positions of adjustment.

3. In a dental instrument, shanks having means for their manipulation, a spindle extending at an angle to the shank, rollers mounted on the said spindle, an extension standing at an angle to the opposite shank,

and a jaw adjustably secured on said extension.

In testimony whereof I affix my signature in the presence of two witnesses.

SAMUEL J. SYMMONS.

.Witnesses:

J. A. TREMBLE, I. S; RANKIN;

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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