US166139A - Improvement in dental pluggers - Google Patents

Description

UNITED ST TES PATENT OFFIoE ANDREW JACKSON POLK, OF MIDLERSBURG, PENNSYLVANIA.

V IMPROVEMENT IN D E NTAL PLUGGERS;

.Specification forming part of Letters Patent No. 166, 139, dated July 27, 1875; application filed May 15, 1875.

To all whom it may concern:

. Be it known that I, ANDREW J. POLK, of Millersburg, in the, county of Dauphin and State of Pennsylvania, have invented a new and valuable Improvement in Dentists Automatic Pluggers; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of in combining with an intermittently-reciproeating plugger-bar and its actuatingspring a device whereby the spring may be compressed, increasing the strength of the stroke given to the plugger-bar according to the needs of the dentists, as will be hereinafter more fully explained and claimed.

In the annexed drawings, A designates'the tubular casing of my improved dental plugger, the same being preferably of cylindrical form, andof. any desired dimensions. In the upper end of this tube a metallic shaft, 13, has its bearings, upon which a disk, 0, is rigidly secured, which rotates through slots a cut therein, as shown in Fig. 1, and is provided with a strip-segment, b. of eccentric form, which engages with a notch, 0, cut in the upper end of an endwise-movable hammer-rod,

D, arranged in the said casing and guided in its movements therein by a diaphragm, d, through which it passes. Hammer-rod D is provided with ahard-rubber head, 02, between which and diaphragm cl is arranged a suitable helical spring, S; and when the said rod is raised by the operation of eccentric strip-cam 6, through the rotation of disk 0, spring S will be compressed, causing rod D, when released from strip b, to impart a sharp tap to an endwise-movable tool-holder, E, which is held to its engagement with hammer-rod D by a spring, 8, recessed into a detachable nozzle,

F, andeompressed by a shoulder, 6, upon the lower end of the said holder. Holder E is guided in its movements by means of its cylindrical lower end, which fits snugly into the recess of nozzleFand by a diaphragm, f, through which its reduced upper end passes and it is tubular, so that a suitable spring, 8, may be placed therein for the purpose of holding a slide, 9, applied upon the said holder and held against rotation thereon by means of a pin, h, passing into a slot cut longitudinally therein from upward displacement, whereby a catch, Gr, pivoted at i in a second slot in the said tool-holder would be allowed to escape from its engagement with the perforated end of a plugging tool, H; This catch is of angular form, and its power end is turned outwardly, so that when slide 9 is forcibly thrust upward, it will depress the said power end, thus disengaging its other end from a perforation in the end of the plugging-tool. The shank of this tool is prismatic in form, and it fits into a correspondingly-shaped socket in the holder, so that it is prevented from all rotation independent thereof; this rotation, when necessary for guiding the end of the plugging-tool to a tooth in different part of the mouth, being obtained by rotating the holder itself through the medium of a milled annulus, j, on slide g, to which access is had for the purpose through a suitable opening, K, cut in the wall of the case, as shown in Fig. 2.

With a View to increasing the power of hammer-spring S to suit the wants of the dentist under difi'erent circumstances, the upper end of the said spring is inclosed within a sliding cap, l, in the interior of casing A, which slide is rigidly secured to a metallic plate, m, upon the outside thereof, as shown in Fig. 2, which plate affords a fulcrum for a vibrating lever,,I, the Weight end of which is adapted to hook over stripeccentric b on disk 0, and arrest its rotation when necessary; this engagement being made automatic and positive by by means of a spring, a, rigidly secured to the under side of the power-arm of the said. leverpawl, with its free end resting upon plate m. The extreme end of the power-arm of pawl I is turned upward, as shown at 0, thereby affiording a thumb-rest, whereby the dentist is afforded What I claim as new, and desire to secure.

by Letters Patent, is-

1. The spring S, adapted to be compressed by slide Z, in combination with tool-holder E and hammer-rod D, substantially as specified.

' 2. The lever-pawl I, in combination with slide 1 and actuating-spring S, substantially as specified.

3. The lever-pawl I and. spring n, in combination with adisk, 0, having eccentric segmental strip 19, substantially as specified.

4. The locking-slide g, having milled annulus j. in combination with a latching-dog, G, and its retainer-spring s, substantially as specified.

5. The case A, having aperture is for operating a rotating tool holder, E, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two Witnesses.

ANDREW JACKSON POLK.

Witnesses:

D. W. PERRY, M. WEAVER.

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