US1233770A - Dental implement. - Google Patents

Description

W. M. FARROW.

DENTAL IMPLEMENT.

APPLICAION FILED MAY 25. I917.

htented July17, 1917.

WILLARD M. FARRQW, or WASHINGTON, DISTRICT or COLUMBIA.

DENTAL IMPLEMENT.

Specification of Letters Patent.

Patented July 1'7, 1917.

Application filed May 25, 1917. Serial No. 170,922.

I '0 all whom it may concern:

Be it known that I, WILLARD M. FARRow, a citizen of the United States, residing at lVashington, in the District of Columbia, have invented certain new and useful Improvements in Dental Implements, of which the following is a specification.

This invention relates to certain new and useful improvements in dental appliances and more particularly to dental tongs of that character designed for handling amalgam and analogous substances and it has for its objects among others to provide a sim ple and cheap, yet efficient and reliable device of this character embodying in the one implement tweezers for grasping the amale gam or other substance and a plugger, the latter being reciprocable within or between the arms of the tweezers and having means whereby the plugger may be held distended by pressure on the tweezers to force the amalgam or other substance into the cavity of the tooth. It has for a further object to provide a device of this character embodying few parts, those simple in their nature, readily assembled, easily manipulated and not liable to get out of order.

Other objects and advantages of the invention will hereinafter appear and the novel features thereof will be particularly pointed out in the appended claims.

The invention is clearly illustrated in the accompanying drawings, which, with the numerals of reference marked thereon, form a part of this specification, and in which- Figure 1 is an elevation of my improved dental implement.

Fig. 2 is a similar view showing the plugger distended and held against longitudinal movement.

Fig. 3 is a view at right angles to Fig. 1.

Fig. 4 is a substantially central longitudinal section through the device with portions broken away.

Fig. 5 is a transverse section on the line 5-5 of Fig. 2, looking in the direction of the arrows.

Fig.6 is a transverse sectionon the line 66 of Fig. 2, looking in the direction of the arrows.

Fig. 7 is an enlarged detail in elevation of the end of the plugger with a portion broken away.

Fig. 8 is a detail of the plugger removed.

Like numerals of reference indicate like parts throughout the several views.

Referring to the drawings,

1 designates the handleor body portion. of suitable material, shape and size. It is provided with a longitudinal bore 2 in which is adapted to reciprocate the stem 3 of the reciprocatory member 4, the outer end of which is provided with a head or the like 5 which may be milled or otherwise roughened for an evident purpose. The other end of the body or member 1 has a bore and opening 6 through which reciprocates the member 4, any suitable means, as for instance, a pin 7 passed through the member 4 and adapted to engage the end of the body 1, bci. vided to limit the movement of the member 4 outward. This member 4 is normally held in the outward or distended position in which it is seen in Figs. 1,3 and 4, by means of a spring 8 coiled around the member 4 within the casin 1 bearing at one end against the shoulder 9 of the member 4 and at the other end against the end wall of the bore 2 of the body 1. When the member 4 is forced in the direction of the arrow seen in Fig. 4, the spring is compressed. When pressure is removed from the head or thumbpiece 5, the spring forces the parts into their normal position, that seen in Fig. 4.

The end of the body or casng 1 adjacent the end is cut away or halved out, as at 10, to receive the adjacent ends of the tweezers 11 which are secured thereto by rivets or the like 12, as seen in Fig. 8.

The outer ends of the two portions of the tweezers are made substantially semi-circular in cross section, as seen at 13 in Fig. 5, their outer faces being rounded and tapered, as seen at 14 in Fig. 3.

The free end of the member 4 is formed into a plugger 15, as seen best in the enlarged view Fig. 7, the extreme end being reduced and rounded, as seen at 16, forming the shoulder 18, as seen clearly in Fig. 7 and adjacent the shoulder 18 is a tapered portion 20, also shown clearly in Fig. 7.

In practice these parts are normally as seen in Fig. 1. The operator, taking the device in his hand, engages the amalgam or gold or other substance with the points of the tweezers, placing his thumb and finger on the latter and holding the head 5 against the palm of the hand. When the amalgam has been picked up, it is carried to the cavity and when in place all that it-is necessary for the operator to do is to apply pressure by the thumb or finger, or the palm of the hand against the head 5, when the member 4: will be pressed in the direction of the arrow in Fig. 4, compressing the spring and forcing the plunger outward beyond the ends of the tweezers. Then, by pressure upon the tweezers adjacent their free ends, they are forced inward into engagement with the shoulder 18 of the plugger, .asiseen in Figs. 7 and 8, when the implement can be used as a plugger to force the amalgam or gold into the cavity of thetooth. It will thus be seen that the one device is capable of use both as tweezers for conveying the amalgam or gold to .the cavity in the tooth, and then for forcing the amalgam or gold into such cavity, without the necessity of having to put the one implementdown and picking up another, thus avoiding the liability of losing the amalgam. as is likely to :occur under ordinary conditions. The conical portion 20 allows the .ends of the tweezers to be firmly compressed and still :hold their .ends against the shoulder. 1

Modifications in details, within the scope of the appended claims, may be resorted to without departing fromthe spirit of the invention jor sacrificing any of its advantages.

l/Vhat is claimed as new is l. A dental implement comprising tweezers having substantially semi-circular free ends and a plugger movable between the tweezers and having a shoulder for engagement by the ends of the tweezers to hold the plugger and tweezers in fixed operative rela- .tion.

'3. A dental implement comprising a bored casing, tweezers carried thereby and having substantially semi-circular free ends, and a spring-actuated member movable in said casing and having at its outer end a plugger with shoulder for engagement by the ends of the tweezers.

i. A dental implement comprising a body portion and tweezers carried thereby, and a spring-actuated member movable through said body portion and carrying at one end a plugger with a shoulder for engagement with the ends of the tweezers and a tapered portion against which the ends of the tweezers maybe compressed.

5. A dental implement comprising a body portion and tweezers carried thereby and having substantially semi-circular free ends, a spring-actuated member movable through said body portion and carrying at one end a plugger-having a rounded end and formed with. a shoulder for engagement with the ends of the tweezers, and a tapered portion adjacent said annular portion.

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

WILLARD M. FARROlV.

Witnesses:

E. Bonn, WM. R. BAUM.

copies .of this'patent may .be obtained for -live cents each, by addressing the Commissioner of Patents,

' Washington, ,JLC.

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