US17891A - Bit-brace foe - Google Patents

Description

yIINITED STATES PATENT OFFICE.

CHARLES C. PLAISTED, OF CHICOPEE, MASSACHUSETTS.

BIT-'BRACE FOR BORING OBLIQUELY T0 THE AXIS OF THE STOCK.

Specification of Letters Patent No. 17,891, dated July 28, 1857.

To all whom olf/may concern:

in oblique position; Fig. V, collars, connecting-link, and handle; Fig. VI, plan and section of the upper cylinder; Fig. VII, plan and section of the lower cylinder.

This instrument can be used in the same manner as the bit-stock in common use, and is also intended for boring holes that are at the junction of two planes or close to the corner of the walls of a room where there is not sufficient sp ace to allow the common bitstock to be turned, as is often required to be done for bell-wires, gas fixtures, &c. To effect this I employ a universal joint, which occupies a position between the bit-socket and the stock, its construction being as described below, the main features of the invention consisting in the united action of the collars, the universal joint, the connecting link and handle.

The bow or crank S, Figs. I and II, is made in the usual manner, having a loose knob or bearer -T, at the top. The collars A and B are fitted to the up er and lower parts of the universal joint R, It', R in such a manner as to allow a free motion of these parts, while they serve asbearings for them; the connecting-link C prevents them from moving around in the bit.

The link C, has a slot U at the end where it is fastened to the upper collar A, by the screws D, D', and as the brace is inclined, more or less, the slot U traverses upon the ins or screws D D', the lower end of' the link (E) making a partial revolution at the same time upon the pins or screws E E', which are attached to the lower collar B. The link C is curved to suit the collars, a art of it being cut out, as shown in Fig. to allow the handle F to be closed or shut into it.

The handle F is fastened, near its lower end, by the pin G to the link, and has, near the same point, a protuberance with a flattened face, as at V, Fig. IV, by means of which, the cylinder H retains the handle F in its closed position when required.

The cylinder H, incloses the upper part of the universal joint R R and when the brace is in the position shown in Fig. I, it rests upon the lower collar B and can not move from this place. The cylinder has upon the inside two grooves, one of them X, Fig. VI, parallel with its aXis, the other W, concentric. The cylinder H is ke t in its roper place by the projecting stud ll, Figs. III and IV which fits the circular groove W. By moving the cylinder H until the stud K passes into the longitudinal groove X the downward motion of the cylinder is eected.

It will be observed that the surface of the cylinder H is at one side for its whole length flattened; this flattened side is, (during the sliding down of the cylinder), toward the handle F; it touches the lower end of it, by passing on the corresponding flattened surface V of said handle F, and holds it parallel to the aXis of the brace, and within the connecting link C.

The cylinder M, inclosing the bit-socket has an eccentric groove N, its outer circumference nearly touching the inside of the cylinder at one point, while the opposite point opens in the outer circumference of the cylinder, as shown in Fig. VII. In setting the cylinder on the lower part R of the universal joint, the spring and latch P is kept close to that part until it falls into the groove N; on giving the cylinder M a turn, the latch P enters the groove N, and as the latch projects at right-angles to the sprin both to the right and left, its projections ho d the cylinder M, and also the bit which is provided, as usual, with a notch near its end.

A steady-pin J, is fastened to the part It and enters the groove in the cylinder H, thus giving greater stability to these parts.

When the cylinder H, is in contact with the collar B, the aXes of rotation of the bit, lthe socket, and the stock are in the same ine.

What I claim is- 1. A bit-stock in which the socket or part that holds the bit revolves about its axis in axes of the bit and the stock are placed and an oblique position With reference to the stock by means of the universal joint, or its equivalent, and the adjustable connecting- 5 link extending from the socket to the stock. 2. In combination With the above, I claim the cylinder or coupling by which the retained in line With eaoh other.

CHARLES C. PLAISTED. [1.. s.]

In presence of* VWARREN SMITH, MAX S. I. WILBE.

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