USRE7263E - Improvement in devices for holding bits and other tools - Google Patents

Description

W. H. BARBER, decd.

J. E. BARBER, Administrator; DEVICE FUR HOLDING BITS AND OTHER TOOLS.

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Reissued Aug. 15, 1876.

@ QVAJ WML N.PETERS. PHOTKLLITHDGRAPMER. WASHINGTON, D (Jv UNITE STATES PATENT ()rrron.

MILLERS FALLS COMPANY, OF MILLERS FALLS, MASSACHUSETTS, ASSIGNEE BY MESNE ASSIGNMENTS, OF J. ERNEST BARBER, ADMINISTRATOR OF WILLIAM H. BARBER, DECEASED.

IMPROVEMENT IN DEVICES FOR HOLDING BITS AND OTHER TOOLS.

Specification formingpart of Letters Patent No. 42,827, dated May 24, 1864; reissue No. 4,736, dated February 6, 1872 reissue No. 7,263, dated AugustllE, 1876 application filed April 19, 1876.

To all whom it may concern.-

Be it known that WILLIAM HENRY BAR- BER, late of Greenfield, in the county of Franklin and State of Massachusetts, invented certain new and useful Improvements in Devices for Holding Bits and other Tools without Fitting the Same to the Holder, and of which the following is a specification This invention relates to instruments for holding bits and analogous tools in the condition in which they are usually purchased, and without any previous fitting to the instrument or holder; and it consists in the novel parts and combinations of parts, as hereinafter fully set forth.

Figure 1 shows the holderwith the jaws closed upon the tool, ready for use. Fig. 2 shows the threaded center-piece and socket designed to'receive a revolving sleeve nut. Fig. 3 shows thejaws and center-piece. Figs. 4 and 5 show thejaws detached. Figs. 6 and 7 show the ends of thejaws, the latter figure also showing the rectangular tapering bore in the socket. Fig. 8 shows the sleeve-nut in section, and Fig. 9 shows the samein side elevation.

The instrument or holder consists of a central piece, A, threaded externally, and provided with a rectangular tapering bore, thus forming a socket to receive the shank of the bit or other analogous tool. A sleeve-nut-, U, is made to fit the screw-thread upon the periphery of the central piece A,and acts to close the jaws upon the tool. The central piece A is bored below the socket to receive a helical spring, D, for the purpose of opening the jaws. The jaws B B are constructed with projections 0 upon their outer sides near their upper ends, and with their lower ends terminating in the angle a and short tang b. The projections c a form summits, from which the exterior faces of thejaws are inclined toward both ends. The upper ends of the jaws, upon their confronting faces and opposite the projections c c, are excavated, in order to make room for the shoulders of the bit-shank, the griping ends or projections a; or taking hold upon the stem ofthe bit below the shank. I

The position of the jaws, when they are abou to gripe upon a bit or other tool, is shown in Fig. 3. The upper ends of the jaws may be nicked, as shown in Fig. 7, so as to grasp :tightly and partially encircle the stem of a bit.

The tangs I) b of thejaws are inserted within and compressed by the spring D, as plainly indicated.

It is of great importance that thesejaws The sleeve-nut O is threaded a portion of lits length to correspond with the thread of the center-piece or socket, and above the threaded portion its internal diameter is enlarged into a chamber, Z, (see Fig. 8,) in the vicinity of the projections c c of the jaws, to allow sutficient range of'movement of the jaws to enable them to receive the largest part of the bit-shank between and below the griping ends or projections of the jaws.

The operation of this instrument is as fol lows: The sleeve-nut O is screwed upward upon the socket or center-piece until the jaws separate, as shown in Fig. 3, and the shank of a tool being then inserted in the rectangular tapering bore below and between the griping ends or projections 00a; of the jaws, the sleevenut is screwed down, thereby closing thejaws and moving them longitudinally in the direction ot'the movement of the sleeve-nut. The jaws are thereby firmly griped upon the tool, and also made to fasten the shank firmly in the rectangular bore of the socket.

It is of great advantage in an instrument of this kind to have the jaws automatically opened, and this is effected by the spring D. When the jaws, occupying the position shown in Fig. 3, are forced together so that their upper ends approach each other, as seen in Fig. 1, their lower ends will form a fulcrum in the socket E, and the tangs will be forced apart against the sides of the spring which surrounds them, so that when the upper ends of the jaws are released by unscrewing the sleevenut, the springs will act upon the tangs, to cause them to approach each other and open the jaws at their upper ends, Where the tool is inserted.

We are aware that jaws tapering upon their outer surface, and made to close by a tapering nut, have been used in awl-holders, an exam- 2' I we;

ple of which may be seen in the patent granted Dexttr H. Chamberlain, February 7, 1854, for an .awl-holder, and such a device is therefore disclaimed. We are also aware that a split or slotted gripe screwing into a nut in an awlhandle has been used, and that the, grasping parts of said mandrel would open slightly by reason of their inherent elasticity, an example of which may be seen in the patent granted to Dexter H. Chamberlain, May 20, 1848, and we therefore disclaim such adevice; but we are not aware that a socket having a rectangular tapering bore to receive the shank of a bit has ever before been used in combination with a sleeve-nut inclosing the jaws, and moving in the direction of the tool-handle to close and center them, or that jaws provided with projections c and :10, or a sleeve-nut having an enlarged internal chamber, have been used either separately or in combination with each other, to meet the requirements of a tool having the peculiar shank of a marketable bit.

\Vhat therefore is claimed as the improvement of WILLIAM HENRY BARBER, in instruments for holding bits and analogous tools,

1. The jaws B B, constructed substantially as and for the-purposes specified.

2. The enlarged chamber Z in combination with jaws having projections c and m, substantially as and for the purpose specified.

3. The threaded socket provided with a rectangular taperingbore, in combination with a chamb'eredsleeve-nut, and jaws having projections c and w, substantially as and for the purpose specified.

4. The combination of a threaded socket,

having a rectangular tapering bore, a sleeve- MILLERS FALLS COMPANY,

By HENRY L. PRATT, President. Witnesses: p

' EDWARD P. STOUGHTON,

JAMES SHEPARD.

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