US745346A - Lathe-chuck. - Google Patents

Description

v PATBNTBD DE0.1,1903. c. C. HARRIS.

LATHE CHUCK.

APPLICATION FILED PEB. 24. 1903'. y

N0 MODEL.

UNITED STATES atented December 1, 1903.

PATENT` OEEIcE.

LATHE-CHUCK.

SPECIFICATION forming part of Letters Patent N0. 745,346, dated December 1, 1903. Application led February 24,1903. Serial No. 144,895. (No model.)

To all whom it may concern,.-

Be it known that I, CHARLES C. HARRIS, a citizen of the United States of America, residingin the city of Ukiah, county o f Mendocino, State of California, have invented certain new and useful Improvements in Lathe-Chucks; and I do hereby declare the following to be a full, clear, and exact description of said invention, such as will enable others skilled in the art to which it most nearly appertains to make, use, and practice the same.

My invention relates to an improved chuck forA clamping and holding a block or other piece of mechanism in a lathe, so as to present it to the drill or other lathe-tool; and it consists of a novel combination whereby the chuck-head can be shifted and rendered temporarily permanent within the range of its circumference, and thereby bring any point Within its circumference in line with the lathetool. It also has'anarrangement by which the chuck-head can beindependently rotated when adjusted to either position and by which a circle around any given center can be presented to a drill or other tool, all as hereinafter more fully described.

Referring to the accompanying drawings, Figure 1 represents a front view of the chuckhead with its converging clamps and showing the eccentric hub and cam-groove in its back piece in dotted lines. Fig. 2 is a side view showing the chuck-head, intermediate plate, and back piece in place. Fig. 3 is a rear view of the intermediate part, showing the eccentric hub and the cam-groove. Fig. 4 is a sectional view of the intermediate part, taken through the line no Fig. 3. Fig. 5 is a rear view of the back piece. Fig. 6 is a sectional view of the back piece,taken through the lines a' z, Fig. 5; and Fig. 7 is a front view of the chuck, showing the eccentric thrown to its widest position, disengaging the sliding clamp to show its application and construction.

My improved chuck is composed of three parts A B C. The part A is the head of the chuck, and it has three jaws or clamp-blocks d d d arranged on its face so as to be moved toward and from its center in the usual man ner of mounting and moving the clamps of a chuck in order to hold the block or otherfpiece of mechanism to be operated upon. The part B -is the intermediate part, and it is centered posite each other on opposite sides will be] sufficient. Each slide g has a stern 71. projecting from it and passing through a bearing t' on the rim of the head-piece A. The opposite end of this stem is provided with screw-threads, and a thumb-nut screws down upon it. By screwing. these thumbnuts tightly down upon the outer face of the head-piece A the slides g are pressed firmly against the outer rim of the groove, and the two parts are bound together as a unit; but by loosening the thumb-nuts the slides are free to travel in the groove, so that the head-piece A can rotate upon the intermediate part B. It is advisable to have the slides g loosely secured to the end'of the stems but is concentric with the center of the hub k. One side of this circular groove is underf out, as shown at Fig. 3, so that it will retain the slide, hereinafter referred to, and prevent it 4from coming out of the groove except at its extremities.

The rear part C of the chuck is of the same diameter and circumference as the two parts A and B, and it has a circular recess L in its front face corresponding with the hub lc on the intermediate part B and adapted to fit over and i-nclose it. This circular recess is also placed on one side of the center of the part C, so that when the two parts are-fitted together, with the hub lo entered into the recess or socket L, the rims of the two parts c0- incide. The part B also carries a slide fm. on the opposite side of its center in position to IOO enter and move in the circular groove Z when the part C is rotated upon the eccentricallyplaced hub 7c. This slideispreferablyametal plate, which is secured to the extremity of a spindlep. Thisspindlepasseslooselythrough the part C, and its outer end is provided with screw-threads, upon which a thumb-nut r is turned. It will now be seen that when the center ofthe part C is coincident with the center of the part B it can be xed in this position by turning the th umb-nut o hard against the rear face of the part B, because the pressure of the slide m against the undercut side of the groove Z will serve to clamp the two parts together; but by loosening the thumbnut fr, so that the slide can travel Jfreely in its groove Z, the part C can be rotated on the eccentrically-placed hub, and thereby carry the center of the part B to a maximum distance from the center of the part C, and at whatever position it is set the tightening of the thumb-nut r will tix it in that position.

The mandrel S, by means ol which the chuck is fixed in the lathe, is secured to the center of the back piece C, as shown at Fig. 2, and when all the parts are tightened together the whole forms an ordinary chuck, which can be used for centering and turning as a unit, in which case the centers of all the three parts are coincident; but by loosening the thumb-nuts j so as to allow the slides g to move freely in the groove f, the headpiece A, in which the block or other piece of mechanism is held by the jaws or clamp d, can be rotated in either direction on the parts B and C, which are still held clamped by the thumb-nut r and friction-holding slide fm; but when it is desired to shift the center the rear nut r is loosened, so as to permit the slide m to move freely in the circulargroove, and the parts A and B can then be rotated upon the eccentric hub 7c, so as to carry the center of the head-block A to any position around the hub-center with its circu mference either to the right or to the left, and when it is thus adjusted to a new center the thumbnut Za can be again tightened, so as to temporarily fix it in that position. By this means any center can be obtained within the radius of the head-piece A of the chuck, and when any of these centers have been xed the headpiece A can be rotated on the intermediate piece B, so as to bring the lathetool to bear upon an entire circle around the main center equal to the distance of the new center from the main center of the chuck.

This chuck will be a very convenient tool in lathe-work, for when the block or other piece to be operated upon is once clamped by the jaws and centered it can be readjusted to a new center without removing it from the jaws.

Having thus described my invention, What I claim, and desire to secure by Letters latent, is-

1. In a lathe-chuck, a circular head-piece having converging holding-jaws on its front face; a circular block centrally connected with the back of the head-piece by a swivel connection; agroove surrounding the outer rim of the swivel-piece; two o1' more slides fitted to move in said groove and connected with the outer rim of the chuck and means for clamping said slides against the side of the groove whereby the swivel piece is stopped from rotating and clamped to the head-piece, in combination with an eccentrically-mounted back piece, substantially as described.

2. In a lathe-chuck composed of three parallel parts, a circular head-piece carrying diverging jaws; au intermediate swivel part concentric to the front part; a hub eccentrically placed on the rear face of the intermediate part; a rear part adapted to fit and rotate on said eccentrically placed hub; a groove or channel in the rear face of the intermediate part concentric with said eccentric hub, a slide connected with the rear part and adapted to move in said groove, and means for clamping the slide in said groove, substantially as described.

In witness whereof I have hereunto signed Illy lltlll.

CHARLES C. HARRIS. i Witnesses:

A. AsHDowNE, C. N. JONES.

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