US408985A - Lathe-chuck - Google Patents

Description

(No Model.)

0. R. MEAD. LATHE CHUCK.

No. 408,985.. v Patented Aug. 13, 1889.

UNITED STATES PATENT OFFICE.

CHARLES R. MEAD, OF ONEIDA, NEW YORK.

LATHE-:CHUCK.

SPECIFICATION forming part of Letters Patent No. 408,985, dated August 13, 1889.

Application filed May 16, 1889.

To all whom it may concern:

Be it known that I, CHARLES R. MEAD, of Oneida, in the county of Madison, in the State of New York, have invented new and useful Improvements in Lathe-Chucks, of which the. following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to an improved lathechuck of the character for which I have obtained Letters Patent of the United States, No. 321,740, dated July 7, 1885, and No. 372,482, dated November 1, 1887; and it has for its object the production of a simple and effective construction of chuck, which shall be more effective and durable in use, and which shall be more cheaply constructed and easily put together than those heretofore devised; and to this end it consists, essentially, in a recessed head for the chuck, an annular ring or disk closely fitting said recessed head and provided upon' its periphery with screwthreads engaged by a screw running transversely through the said chuck-head, dogs or jaws pivoted to the chuck-head and provided with a crank-arm engaging the annular ring and rotated thereby when the transverse actuating-screw rotates the disk or annular ring.

It furthermore consists in the detail construction and arrangement of the parts, all as hereinafter more particularly described, and pointed out in the claims.

In describing my invention reference is had to the accompanying drawings, forming a part of this specification, in which like letters indicate corresponding parts in all the views.

Figure 1 is an elevation of my improved chuck. Fig. 2 is a longitudinal sectional view taken on line mtg-Fig. 1, illustrating the relative construction and arrangement of the parts. Fig. 3 is a face view of the chuck, illustrating the face or covering plate, the jaws, and the screw for operating said jaws. Fig. 4 is a horizontal sectional view of the lathe-chuck, taken on line y y, Fig. 2, clearly Serial N0. 3111013. (No model.)

6 is a top plan view of the jaw illustrated in Fig. 5 and Fig. 7 is an elevation of the annular ring provided with slots or cut-outs for engaging the crank-arms provided upon the jaws of the chuck, and provided with a groove on its outside periphery for engaging the operatingscrew journaled transversely in the chuck-head.

A represents the chuck-head, which may be of any desirable form or construction for use in any particular style of machine. The forward extremity of the chuck-head A is pro vided with an annular recess or socket A, concealed by a covering plate or cap B, which is preferably secured by screws Z) to the front face of said chuck-head.

0 represents the chuck-j aw, which is interposed between the inner face of the coveringplate B and the adjacent face A of the recess A. These jaws are provided with trunnions c c, journaled in the face A of the chuckhead and the adjacent face of the coveringplate B.

Mounted within the recess A, and preferably closely fitting the periphery thereof, is the annular sleeve or disk D, which is provided on its outside periphery with a groove d, having a portion thereof screw-threaded and engaging a screw E.

Provided upon the disk D are the cut-outs (Z of an equal number to that of the chuckjaws and of suitable form to engage and operate the crank-arms 0, provided upon the chuck-jaws.

The screw E is journaled in the chuck-head, preferably in a horizontalplane, and is provided at one extremity with the shoulder e, abutting against a like shoulder a of the chuck-head, and is provided at the other extremity with a screw-threaded spindle 6, engaging a nut E, which nut abuts against a shoulder a, formed upon the chuck-head. This screw preferably extends beyond this journal-bearing but a short distance, so that the liability of objects being caught thereby is entirely obviated. In order to turn said screw, I provide the handle F, which is detachable therefrom, and with a projection f engages a slot 6 or other opening in said screw.

By reference to the drawings and the foregoing description it will be seen that when the handle F is turned the screw E is also turned, and its threads engage the screwthreads of the groove d of the rotatable sleeve D. As the sleeve D is rotated, the cut-outs d engage the crank-arms c of the jaws C and revolve the jaws either toward or away from each other, according to the rotation of the said sleeve. The plate 13 is provided with an opening I), centering with the hearing or biting surfaces 0 of said jaws C; and it will be seen that these jaws have an adjustment equal to the peripheryof said opening I). This operation or adjustment of the jaws is very certain and strong, as the screw turnspositively and is prevented from longitudinal movement by reason of the shoulders e and the nut E. The rotation of the disk D, by means of the engagement thereof with the crank-arms c, is thus utilized to rotate the chuck-jaws upon their pivots. Moreover, the sleeve D engages the chuck-jaws C by a leverage, and it will be seen that the nearer these jaws approach each other the more powerful is their action. Thus by utilizing the screw-engagement of the screw E and the sleeve D, and the engagement of the sleeve or ring D at a leverage with the crank-arms c, I obtain a very powerful chuck.

The parts of my improved lathe-ehuek are very simple in construction and are very easily manufactured, and are readily assembled without much fitting thereof, thus producing at a very slight cost a very powerful chuck, which possesses features of great advantage.

The operation of myinvention will be readily perceived from the foregoing, and it will be understood that considerable change may be made in the relative construction and arrangement of the parts without departin from the spirit of my invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A jaw for aehuek having the bearing or biting surface 0 pivot-points or trunnions'c, and crank-arms c, substantially as and for the purpose specified.

2. The combination of the chuck-head, jaws pivoted to the chuck-head, an annular rotatable ring for engaging said jaws, and revolving to adjust and clamp the same, substantially as and for the purpose specified.

3. The combination of the chuck-head, the covering-plateB, jaws pivoted to said head and plate, and a rotatable sleeve for engaging said jaws, and revolving to adjust and clamp the same, substantially as and for the purpose described.

4. The combination of the chuck-head, jaws pivoted to the chuck-head, and crank-arms provided upon the jaws, and the rotatable sleeve for engaging said jaws, and revolving to adjust and clamp the same, substantially as and for the purpose specified.

5. The combination of the chuck-head, jaws pivoted to the chuck-head, and crank-arms provided upon the jaws, the rotatable sleeve, slots or cut-outs provided in the sleeve, and a screw for engaging said disk and retating the same, substantially as and for the purpose specified.

In testimony whereof I have hereunto signed my name, in the presence of two attesting witnesses, at Syracuse, in the county of Onondaga, in the State of New York, this 29th day of April, 1889.

CHARLES R. MEAD.

\Vitnesscs:

A. E. PARSONS, CLARK ll. NORTON.

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