US445717A - Dental plugger - Google Patents

Description

(No Model.)

E. J. GEORGE. DENTAL PLUGGER.

No; 445,717. Patented Peb. 3,1891.

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ATENT EDGAR J. GEORGE, OF JOLIET, ILLINOIS.

DENTAL PLUGGER.

SPECIFICATION forming part of Letters Patent No. 445,717, dated February 3, 1891.-

Application iiledd'uly 18, 1890. Serial No. 359,199. (No model.)

- To all whom t may concern.-

Be it known that I, EDGAR J. GEORGE, a citizen of the United States ef America, residing at Joliet, in the county of Vill and State of Illinois, have :nvented certain new and useful Improvements in Dental Pluggers, of which the following` is a specification, reference being had therein to the accompanying drawings and the letters of reference thereon, forming a part of this specification, in which- Figure 1 is a central vertical section of the case of the instrument and a side viewof the working parts inclosed therein. Fig. 2 is a cross-section taken on line 2 of Fig. 1,1001;- ing down. Fig. 3 is a top plan view of the operative parts within the case, taken on line l of Fig. 1, looking down; and Fig. 4. is a crosssection of Fig. l on line 3, taken through the pin on the plugger-tool and notches in the nose-piece of the case.

This invention relates to certain improvements in dental pluggers, which improvements are fullyset forth and explained in the following specification and claims.

Referring to the drawings, A represents the case proper of the instrument, having a nose piece A screwed on its lower end and a cap A2 screwed on its upper end. At-ubular handle B is detachably connected to the side of case A by means of screws w w or by any other suitable means, and an opening through the side of the case A leads to said handle, so that theworking parts therein may extend into the case A. A plugger-tool E, carrying a bit T on its lower end, is arranged centrally within the case A, and is held in proper position by means of the diaphragmsP and P', through which it passes. ger-tool is provided with a head R, having a diameter larger than said tool.

Z is a coil-spring sleeved on the pluggertool and introduced between its head R and the diaphragm P, and is for the purpose of yieldingly supporting the plugger-tool and giving it a rebounding action. An enlarged portion x on said tool on its lower end prevents the tool from moving too far upward.

S isa shaftjournaled at each end in the sides of the handle B, and has journaled on it the scapewheel c, and has also secured on it the pinions S and ratchet-wheel o', which pinion and ratchet are integral with each other. A

The upper end of said plug-v pawl y, attached to the side ot' scape-wheel c, engages the teeth of said ratchet-wheel r, the spring y serving to hold said pawl to its work.

S2 is a shaft journaled at each end in han- L .per end toothed to form a rack for meshing with the pinion S, and is arranged in case A at the side of the plugger-tool E and held in position by the said diaphragme, through which it passes. The lower end of said rackbar is connected to the inner wall of the nosepiece A by means of the coil-spring Z,which serves to return said rack-bar after it has been moved upward. Said rack-bar is provided with a laterally-extending trigger E', which extends out through a slot F in the side of case A and traverses within the limits of said slot. By means of said trigger the said rackbar D may be reciprocated for the purpose of driving pinion S and scape-wheel c intermittently.

It .will 'ne observed that the shafts S and S2 are journaled in the handle B, which is detachable, so that the Working parts of the plugger maybe easily reached for repairs, dac.

The plugger-tool E is rotatable, so that the bit T maybe turned to adapt it the more readily to its work. The lower end of the nose A is provided with notches t', as shown in Fig. 4, and the plugger-tool E is provided with a corresponding radially-extending pin or projection which will Iit said notches. This pin and the notches are for the purpose of holding t-he plugger-tool rotated in anyposition desired.

The plugger-tool may be moved downward and then rotated, and the pin fc be placed in any one of said notches t' andheld therein by the resiliency of spring Z and thus hold said tool in the required position.

In operation the operator grasps the handle B and extends a finger around the trigger E. By pulling upon the trigger the rack-bar D will be caused to move upward and drive pinion S and scape-wheel c with it as its pawl 1/ engages the ratchet-wheel r, which is integral IOO with said pinion. The pallet ais operated by the scape-wheel c and causes the hammer V to strike the head R of the plugger-tool E a succession of sharp rapid blows. Then the trigger is released the springZ will return the rack-bar to its first position, and as pinion S and ratchet-wheel 7" are permitted to turn backward by the pawl-and-ratchet mechankI claim as new, and desire to secure by Letters Patent,is as follows, to wit:

l. In the dental plugger shown' and described, the combination of the reciprocating rack having a trigger extending out through a slot in the side of the case, the pinion for meshing` with said rack and fast on its shaft, the scape-wheel adapted to be driven intermittently in one direction by said rack and pinion, the pallet operated by said scapewheel and provided with a hammer, and the plugger tool or rod seated on a spring and arranged to receive the blows of the hammer, all arranged to operate substantially as and for the purpose set forth.

2. In the dental plugger shown and described, the yieldingly-seated plugger tool or rod, the pivoted hammer for striking said plugger-rod, the pallet and scape-wheel mechanism for operating said hammer, and the reciprocating rack for intermittently driving said scape-Wheel and pallet mechanism, substantially as and for the purpose set forth.

EDGAR J. GEORGE.

Witnesses:

THos. H. HUTCHINs, A. S. GHEESEMAN.

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