US90388A - Improved dental instrument - Google Patents

Description

com sata @strut @Mira news Para: No. 90,388, dans my 25,1869. 4

IMPRO'YED DEN-TAL INSTRUIEENT.

The Schedule referred to in these Letters Patent and making part 0! the nl.

To ali whom 'it ma/y concern:

Be it-known that I, W. Rf-POME'BOY, of ,Millersburg, in the county of Holmes, and State of. .Ohio, have invented certain new and useful Improvements in Dental Instruments; and I do hereby declare that the following is a full and complete description of the same, reference being had to the accompanying drawings, making-a part of this specification, in which- Figure lA is a sideview of the instrument.

Figure 2, a view of the front edge. v

Like letters of reference refer to like parts in the several views presented.

This invention 4relates to a dental plugger, for condensing a filling of metallic foil in the cavity of a tooth, the power being applied by a succession of blows given by a mallet, the same being operated by a nger of the hand holding the instrument, the degree of force required being regulated by an adjusting-screw, hereinafter more fully described.

In iig. 1, A represents a bracket, .on .the front edge of which is secured a sleeve, or socket, B, in which is inserted the shaft C of an ordinary plugging-instru ment, and secured therein by a thumb-screw, D.

To the extreme rear end of said bracket is pivoted anarm, E, having a hammer or mallet, 0, attached to the free end of the same.

Also attached to the bracket is a stay, F, to serve as a support for the screw a.

H is a coiled spring, the coiled end of which is se-I cured tothe bracket, whereas the upper, or free end is attached to the arm through the intervention of' the link I and collar J, to which it is pivoted, thereby making an easy and flexible joint.

K is a cord, one end of which is attached to the mallet, whereas to the other is secured a thimble, L, the purpose of which will be presently shown. l

Having thus described the construction and arrangement of the instrument, the practical operation of the same is as follows, viz:

The operator holds the instrument between the thum'b and first two fingers, below the sleeve referred to, or at such other point as may be the most convenient, in order for a proper application of the point of the instrument to the tooth.

The position of the instrument is such that the articulation of the arm E will be toward the operator,

which will bring the cord across the back of the fingers. The end of the small one is inserted in the thimble, whereby the hammer is operated for giving the blows upon the upper end ofthe plugger from time to time, as the operator may require, the force of the blows being regulated by the power applied by the finger, also by the distance that the mallet falls from its elevation, shown in fig. 1, to the end of the plugger, said distance being lengthened or shortened by the adjusting-screw a in the upper end of the stay F, through which it passes, and contacts with the arm E,

'against which'it'will strike on being screwed down,

thereby shortening the stroke, and lessening the force of the blow more or less, according to the distance that the screw may be turned down.

It will be obvious, that in consequence of the pecu-` liar arrangement of the spring and link H I, the greatest resistance of the spring is obtained on the first 'start of the mallet, and, as the link approaches a hori- ,zout'al line, the leverage increases, thereby operating the mallet more easily and with greater eiect than if p the resilience of the spring continued until the striking of the mallet. By this means, a more delicate and varied succession of blows can be given,^'thereby making the instrument much more effective in the hands of the operator than the automatic pluggerand other instruments of this class now iii use bythe dentalpr'ofession, as in such instruments the blow is usually given by a spring, which is operated by pressing the point of the instrument upon the foil in the cavity, and, in consequence of the continued resistance of the spring until the blow is given, it is a matter of much diiiiculty to regulate its intensity, whereas in thisl instrument the intensity of the blow is regulated and controlled by means of the set-screw a, and by operating the mallet independently, by means of the finger. l

I am aware that a mallet has been used'in combination with a plugger. This I do not claim. But that which distinguishes my vinvention lfrom others is the special arrangementof the spring and lever-link H I, whereby the resistance of the spring is overcome by the increase of the power of the link, or lever,'in proportion as the mallet approaches the end of the plugger, thereby giving the operator greater control over the instrument, for regulating the force of the blow, than can be exercised over those now in use. Also,

operating the mallet independently, by the nger, by

means of .the cord and thimble, the particularadvautage of which is, that a blow can be given with or Without pressure, or pressure without a blow, at' any time, and of any required `degree of intensity, at the will of the operator.

Another advantage in my invention, over others, is that an ordinary dental hand-plugger is used, instead of a short point made expressly for the instrument.'

The expense is, therefore, greatly reduced, so 'that-the dentist is enabled to use, in connection therewith, .the same kind of plugging-instruments which are now used by hand-pressure, or with the mallet and assistant.

What I claim as my invention, and desire to secure by Letters Patent, is

The adj usting-screw a, yoke F, arm E, bracket A; mallet G, and plugger G, combined and arranged' to operate in the manner substantially as described, and for the purpose specified.

Witnesses: W. R. POMEROY.

J. H. BURRIDGE, FRANKS. ALBEN.

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