US237062A - starr - Google Patents

Description

Unteren STATES PATENT @Erica ELI T. STARR, OF PHILADELPHIA, PA., ASSIGNOR T() JAMES W. WHITE, J. CLARENCE WHITE, AND H. M. LEWIS, TRUSTEES, OF SAME PLAGE.

HAND TOOL. OR IMPLEMENT.

SPECIFICATION forming part of Letters Patent No. 237,062, dated January 25, 1881.

Application filed July 16, 1880.

To all whom it may concern:

Be it known that I, ELI T. STARR, a citizen of the United States, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Hand Tools or Implements, of which the following is a specification.

My invention relates to the class of handinstruments in which a socketed handle is employed for the reception of the shank of an operating-tool, so that the handle may be a common one to several tools which are capable of being easily inserted, securely held, and readily removed from the handle.

The object of my invention is to provide an instrument of the type above referred to which is capable of a high nish, is capable of convenient manipulation with a firm grasp Without unduly fatiguing the hand, is reliable in its operation, and is withal comparatively in expensive, while permitting the ready change of the operating-tools, as desired.

The subject-matter claimed is particularly pointed ont at the close of the specification.

The accompanying drawings illustrate the best Way now known to me of embodying my improvements.

In said drawings, Figure l is an enlarged view of the improved instrument complet-e; and Fig. 2 is a sectional View, on a scale still larger than that depicted in Fig. l, of the front end of the handle, with an operating-tool inserted therein constructed according to my inventiom,

The handle A is preferably made of metal, highly finished in ways well known in the art, with a preferably roughened surface, to afford a firm grasp without unduly fatiguin g the hand in operation. Thefront end of said handle Ais socketed for the reception of an operating-tool, the socket preferably consisting of a smooth I front portion, a, a screw-threaded portion, a',

in rear of said smooth portion, and a conical or tapering seat or termination, a2. (See Fig.

2.) The socket may consist of the threaded portion and the tapering or conicalseat only; but I prefer the form of socket first described.

The operating-tool B has a shank formed correspondently with the socket of the handle (No model.)

A, so as to lit said socketthat is, the said tool has a round or cylindrical portion, b, to iit the corresponding front smooth bore or portion, a, of the socket. It has a screw-threaded portion, b', to it the female screw a of said socket, and it has a conical or tapering end, b2, which fits the corresponding seat a2, constituting the termination of the handle-socket. The shank of the tool may have the screwthreads and tapering end or termination only to t a corresponding socket; but I prefer the form of tool-shank first described. The object in having the round portion b of the toolshank B to fit the similar portion of the socket in the handle A is to give the tool a long bearing in the handle at front, to secure steadiness firmness, and rigidity of the tool. The object in providing the shank with screw-threads is to secure the tool rmly in the handle from endwise movement and to take up wear, While permitting of the ready change of tools; and the object in having the tapering or conical end of the tool to t a corresponding seat in the handle is to produce friction sufficient to prevent the tool from turning or unscrewing during the ordinary'use of the instrument.

I have shown my improvements organized as a dental plugging-instrument, which is to be used in the same manner as the ordinary hand-pressure plugging-tools which my iinproved instrument is intended to supersede.

My improvements may also be organized as chisels, excavators, 85e., suoli as used by dentists.

The dentist, in illin g, plugging, or working upon teeth, requires a number of tools or points with ends varying in shape and construction to reach different parts ofthe cavity in the tooth,for operation in different positions in the mouth, and for operation upon llings and teeth of diiferent characters. The importance and advantages of my improvements are therefore obvious.

The taper given to the end of the tool and to the seat in the handle which it occupies, may, of course, be varied according to the amount of friction desired, while I also contemplate constructing the handles of different sizes adapted to tools of a uniform size of shank, or to tools or points the shanks of which are adapted only to the particular sized handle with which they are to be used.

I am aware that screW-shanked operatingtools have been used having a cylindrical portion in front provided with a bolster or enlargement to abut against the front end ofthe handle in which they lit. My tool has no such bolster, as a bolster on thc tool abutting against the front end of the handle would prevent adjustment to compensate for Wear of the screw and tapering end ofthe tool, and of the handle-socket, as shown by me.

I claim as my invention- 1. The operating-tool constructed, substan tially as hereinbet'ore set forth, with a shank having a. plain unbolstered cylindrical portion, a screw-threaded portion in rear of said c vlindrical portion, and a lengthened tapering buttl end or termination. l

2. The combination, substantially as herein before set forth, of the instrument-handle having a socket consisting of a smooth front portion, a screw-threaded portion, and an extended tapering portion constituting the termination of said socket, with a tool fitting said socket havingaround unbolstered or plain shank, a screw-threaded portion, and an extended tapering end or termination, whereby the tool is firmly locked in the handle during use, is readily removable to permit change ot' tools, and may be adjusted in the handle to compensate for wear and insure a firm connection.

1u testimony I have hereunto subscribed my name.

ELI T. STARR.

Witnesses:

WM. J. PEYTON, L. B. WIGHT.

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