US192746A - Improvement in dental pluggers - Google Patents

Description

R B. DONALDSON. DENTAL-PLUGGER..

Patented July 3,1877;

N- PETERS. PHOTO-LITHDGHPH UNITED STATES.

PATENT OFFICE.

ROBERT B. DONALDSON, OF WASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT IN DENTAL PLUGGERS.

Specification forming part of Letters Patent No. 192,746, dated July 3, 1877; applieationled June l, 1877.

Te all 'whom it may concern Be it known that I, ROBERT B. DONALDSON, of Washington, District of Columbia, have invented certain new and useful Improvements in Dental Pluggers; and I do ,hereby declare thatthe following is a full, clear, and exact description thereof, `which will enable others skilled in the art to `which'itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon, which form a part of this specification, and in which- Figure 1 is a side elevation of my improved dental plugger. Fig. 2 is a plan view thereof. Fig. 3 is a vertical section through the dotted line .fr a' of Fig. 1 and Fig. et is an enlarged detached view, in side elevation, of the retaining device for detachably securing the plu gger or other instrument in the stock or tube.

Corresponding parts in the several iigures are denoted by like letters.

This invention relates to certain improvements in dental pluggers; and it consists, first, of a retaining device for manipulating and detachably securing the tool or instrument; secondly, of mechanism for obtaining `a uniform and steady blow; and, thirdly, of the same for regulating the force of the blow, substantially as hereinafter more fully set forth and claimed.

In the annexed drawing, A refers to the stock or tube which receives the tool, or plugger, or other dental instrument, passingentirely through said stock and beyond it, contiguous to the external hammer, by which,it will be seen, that the blow is brought directly upon the tool itself, which isinserted in its stock so as to have an independent motion, as hereinafter described, and thus avoid the necessity of having to operate the tool by vibrating the stock by hand.

By means of my device the hammer can be operated without thus vibrating the stock, and its number of blows in a given time can be increased or diminished. For convenience in introducing the spring and retaining device, to be hereinafter referred to, the stock or tube is made in two parts, a a', one having a screw entering a female screw in the other to ldetach ably connect them together.

The internal circumference of the part a.' is

connected to the latter, as presently described. The tube b is provided upon one side with a l slot, b, for the reception, and to permit of a tooth or detent of a lever-spring, d, projecting into the tube or stock A. The lever-spring d is inserted and fastened in a'taperiug recessV in the tube b, sloping toward and terminating in the slot b', as seen in Fig. 3.

It will be observed that, -upon the insertion into the stock or tube A of the instrument, which should irst be notched or recessed, the detent or tooth of the lever-spring d will spring into the notch or recess of the instrument, and

vthus retain or secure it in place ready for use.

The instrument can be as readily detached by vsimply lifting the detent or tooth ofthe leverspring d out of its notch.

The tube b is next rotated, the stock or tube A being cut away or provided with an opening, e, through which the tube b may be reached until the lever-spring d, having the detent or tooth, is concealed or brought opposite the wall of the stock or tube A, when the detent or tooth of said lever-spring will be prevented from becoming disengaged from the instrument, it having thus been locked therein. To assist the rotation of the inner tube l) by the hand it maybe roughened or milled, as seen in Fig. l.

The primary object of the inner rotary tube `b is, it will be seen, by vibrating the same with the thumb, to manipulate the tool or instrument.

B is a case or support, attached at one end to the upper end of the stock or tube A, and having its other end more or less elevated. C is the mallet or hammer, disposed external to the stock and directly over the upper end of the plugger or instrument, and provided with a spring-lever,f, preferably curved and fulcrumed in the distant end ofthe case or support B, at f its free end having a lateral projectiom g,y against the lower sideof which bears the-free endl of acurved or other shaped spring, h, fastened to the case B. This spring is caused to bear with greater or less pressure upon the mallet or hammer lever f, in order to regulate the force of its blow, by means of tension mechanism, consisting, in. this instance, offthefol'- lowing parts is a plate or bar, arranged upon the lower side of the cas@ B, about midway through which plate oryba'r passes a thumbscrew, il, entering the said case. The inner end of the plate or bari also enters the said case, while its outer end is provided with an upright stud or projection, t2, bearing against the spring h.

It is fully apparent that other means may bedevised=qually adapted'for regulating the tension ofL the spring h.` The hammer or mallet- U is vibrated by a cam, j, upon an axis bearing in the case 13, whichstrikes a pendant or projection, 717 depending from the hammer or mallet lever f.- Disposed' upon ,the saine axis with the cam j lis a pinionor cog', l, gearing with a second pinion'or cog, m, having its axis n bearingin 4the case B, and'extending. beyond-the case forattachment to` any suita-y ble motor. Through this intermediate gearingit will be observed-that a steady andu nient, is-

1. InlI a44 dental, plu gger, the retaining device having thelever-springd, provided with a detent or tooth, substantially as and for the purpose set forth.

3. The tube b, resting upon and in combination with the springt); stock'A,and leverspring d, having 'a detent or tooth, substantially as and for the purpose set forth.

4. The mallet or hammer G, having a 1ever, f, provided withva lateralprojection, gl', in co m' verhavingka pendant,`in combination with the cam j andgearingljm, substantially as andi for the purpose set forth.

In testimony that I claim the foregoing as I ymy own I hereunto affix my signaturein, presrence ofjtwo Witnesses.

n. B.; DQMLDSQN: Witnesses r H. G. THOMPSON, Hf. ScHooLEX,

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