US1008057A - Chuck. - Google Patents

Description

E. G. PEGK.

CHUCK. APPLICATION FILED MAR.27, 190v.

Patented Nov. 7, 1911.

Lie/enter! onrrnn sTaTns PATENT @ETTQE.

EUGENE C. PECK, OF CLEVELAND, OHIO ASSIGNOR TO THE CLEVELAND TWIST DRILL COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

CHUCK.

To all whom it may concern:

Be it known that I, EUGENE C. PECK, a citizen of the United States, residing at Cleveland, in the county of Guyahoga and State of Ohio, have invented a certain new and useful Improvement in Chucks, of which the following is a full, clear, and exact description.

My invention relates to drill chucks and is more particularly directed to that style of chuck which is adapted to receive and hold drill shanks having two opposite longitudinal V grooves therein.

The object of the invention is to provide a form of chuck which shall overcome those defects present in the drill chucks now known, such as liability of the jaws slipping and the hood to yield to sidewise strain and the lack of sufficient side bracing to prevent the shearing of the jaws. To achieve these results, I have embodied my invention in concrete form as described in the following specification and illustrated in the accompanying drawings in which- Figure 1 is a side elevation partly broken away and in section, showing the assembled chuck. Fig. 2 is a view similar to Fig. 1 showing the chuck body. Fig. 3 is an end view of the assembled chuck. Fig. 4 is a side view showing a jaw. Figs. 5 and 6 are respectively views of opposite ends of a jaw.

I provide the body A of my chuck with a threaded portion A designed to receive a hood B having an internal thread B and an internal conical taper B Back of the threaded portion A on the body I provide a cylindrical bearing surface A adapted to receive the rear end B of the hood which is closely fitted thereto. The forward end of the body beyond the threaded portion is reduced and slotted at- A to receive the radially reciprocative V jaws C which, in the present instance, are shown as two in number and provided with suitable retaining means to prevent them from dropping through their respective slots, the means shown consisting of a rod spring C extending through the length of the jaw and resting at each end upon a ledge A at the end of the slot. The outside of the jaws is given a conical taper G to fit the interior conical taper B of the hood while the apex C of the V edge of the jaws is straight lined to fit the V groove in the shank of the drill. The extreme forward end A of the chuck Specification of Letters Patent.

Application filed March 27,1907.

Patented Nov. 7, 1911.

Serial No. 364,762.

.body is cylindrical in curvature and concentric with the cylindrical bearing surface A previously described as located behind the threaded portion of the body. The hood is fitted to the bearing surface A at the forward end of the body. It is further to be noted that the forward hearing A extends entirely around the tool-receiving openin and thus bridges the forward ends of the jaw slots A so that there is one continuous band of metal at this end of the chuck. I

also prefer that small projections A be formed on this band immediately in front of the jaw slots, which additional pieces of metal not only increase the strength of the band at this point but serve as indices projecting from between the hood to indicate to the operator the alinement to observe in inserting his tool shank into the chuck in order that the grooves may coincide with the jaws of the chuck.

From the structure above described, it will be evident that, upon rotating the hood in the ordinary manner to the right, the cone of the hood will pass up on the jaws and advance them with a parallel motion into the grooves in the shank of the tool. It is further to be observed that the hood, which backs the gripping jaws and receives the tremendous pressure to which the jaws are subjected, tending to move them out of their true concentric position, is provided with fitted concentric bearing surfaces near its extremities, beyond each end of the gripping jaws, thus providing the most rigid and secure bracing possible so that there is no means by which it could possibly give or vibrate.

It will be seen that the sidewise twist given to the jaws is resisted along their sides and at each end thus preventing them from twisting or being sheared off at some point intermediate their ends. Again, it is to be noted "that the sides of the jaw slots are, in my construction, closed and tied together at both ends so that although the sides of the slot receive and take up the side twist given to the jaws, nevertheless they will not split or spring, except under a pressure which would burst a cylinder so slotted.

The gripping jaws fit rather closely the slots in which they float and any unevenness in their movement would probably cause them to bind. It will be seen, on referring to the drawing, that I have formed a horizontal opening through each jaw, which opening is adapted to receive the supporting spring but which has a bearing surface for such spring located so as to insure that the resultant thrust or tension of the spring shall be exerted along a line passing approximately through the center of the jaw. This will give an even movement of the jaw through the slot in which it floats so that there will be no binding or crowding at either end or side.

Having thus described my invention, 1 claim:

1. A chuck having an integral body provided with supporting bearing surfaces at its ends and being provided with slots intermediate of said bearing portions, the said chuck body being screw threaded between the rear bearing surface and the rear end of the slots, aws mounted in said slots, said jaws being tapered upon their upper sides, a hood mounted upon the said body and having a portion of its inner surface tapered complementarily to the taper upon the aws, the said hood having portions which bear upon the bearing surfaces upon the chuck body, the interior portion of said hood being provided with screw threads which engage with the screw threads upon the body of the chuck, substantially as described.

2. A chuck having a slotted body, jaws mounted in said slots and having resilient members adapted to travel in extensions of said slot, and a hood for actuating said jaws.

3. A chuck comprising in combination, a chuck body having jaws resiliently mounted in slots therein, said chuck body terminating at opposite ends in concentric smooth bearing surfaces, a hood mounted 011 said chuck body and adapted to move longitudinall on said oppositely arranged bearing surfaces to advance the said jaws toward the axis of the body.

4. A chuck having an integral body with concentric supporting surfaces, an axial bore, a screw thread and a plurality of radial slots intermediate said supporting surfaces, jaws mounted in said slots and having longitudinally-arranged, resilient members adapted to move in extensions of said slots, and an actuating hood having at its extre1nities supporting surfaces fitted to the concentric surfaces of the body and a screwthread and conical surface intermediate its supporting surfaces.

5. A chuck having a body with slots therein, jaws in said slots, a hood adapted to operate said jaws and inclosing the same, and lugs projecting from said chuck body so as to be visible and located to serve as indices for the position of the jaws.

In testimony whereof, I hereunto aflix my signature in the presence of two Witnesses.

EUGENE C. PEOK.

lVitnesses:

E. B. GILCHRIST, H. R. SULLIVAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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