US442230A

US442230A - Charles leon libby

Info

Publication number: US442230A
Authority: US
Publication date: 1890-12-09
Anticipated expiration: 1907-12-09

Description

2 sheets-snet 1. G. L. LIBBYl (No Model.)

, www um @REW mms. No. 442,230.

Patented Dea. 9, 1890.

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UNITED STATES PATENT. OFFICE..

. CHARLES LEON LIBBY, .OF BRIDGEPORT, CONNECTICUT, ASSIGNORLTO EDWARD P. BULLARD, OF SAME PLACE.

CHUCK FOR SCREW-MACHIN ES.

SPECIFICATION forming part of Letters Pate'ntrNo. 442,230, dated December 9, v1890. Application filed August 16, 1890. Serial Nol 362,190. (No model.)

To aZZ whom it may concern 'Y Be it known that 1CHARLES LEON LIBBY, a citizen of the United States, residing at l-ridgeport, in the county of Fairfield and State of' Connecticut, have invented certain new and useful Improvements in Chucks for Screw-lilachines; and l do hereby declare the following to bea full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

'llus inventioli relates to certain new and useful improvements in chucks such as are used in screw-machines and similar machines, and has for its object to provide a chuck in which a parallel movement is imparted to two independent graspingsurfaces, whereby the rod to be worked is held perfectly axial with the chuck, and, furthermore, it is the object of my invention to provide simple and eicient mechanism whereby the appropriate movement of the chuck, both opening and closing, may be edected; and with these ends in view my invention consists in the construction and the several combinations of co operative elements hereinafter to be fully and in detail explained, and then recited, in the claims.

In order thatthose skilled in the art to l which my invention appertains may fully understand both its construction and its method of operation, I will proceed to describe them 1n detail, reference being had to the accompanying drawings, which form a part of this specification, and in which- Figure 1 is the front elevation, partly in section, and Fig. 2 a central vertical longitudinal section. v f

Like numerals denote the same parts in both the figures of the drawings.

y The standard, which is designated by 1, is mounted upon the bed of the lathe,-which I have not. thought it necessary to show, as is common and usual inpsuch machines. The lower end of said standard is provided with a bearing,in which is journaled and adapted to revolve a hollow lathe-spindle 2. The forward end of this spindle carries an annulaihead Within the extreme outer end of this head is firmly secured a ring 4, whose sectional shape is shown at Fig. 2, and whose interior is therefore tapering. Somewhat behind this ring is a second ring 5, very similar iu shape, but oppositely tapered, and so arranged within the bore of the head that it may have a sliding movement therein toward and way from the ring 4, for the purpose presently. to be explained.

6 is a sleeve having either end thereof. l At itsl center itisucut away both within and without,althoughrlthis; x' is not absolutely essential. Saidring issplit 'j from bothends, as shown at 8, Fig. 2, theslits graspingsurfaces 7 at therein being cut alternately from each exf tremity. Said ring has kalsovupon each endff y' tapered surfaces 9, which, when the chuck is in the central position are adjacent to the tapered surfaces of the

rings

4 and 5.

From the foregoing description and an inspection of Fig. 2 of the drawings it is appar-v ent that if therring 5 be forced toward the riug4 the action of the two rings will be to compress the split sleeve, which is enabled by the slit therein to yield inwardly.

. The second portion of my invention has for its object, as heretofore stated, a means for operating the parts hereinbefore described, and" the mechanism which I employ for this purpose is as follows: Upon opposite -sides I cut through the head 3 recesses l0, in each ofv which I pivot a lever 11, having a short projection 12, which abuts against the rear end of the ring 5, and a longer projection ort-ail 13. EitherI two or more of these levers may.

be used, as convenience may dictate; but two vare amply suflicient for all practical purposes.

Arranged around the outside of the head isa ring 14, having a groove 15 in its outer surf e face, and being recessed, as shown at 16, lto form housings, in which rest rolls 17, imme. diately over and in contact with the parts 13 of the levers 11. This ring 14 is adapted to have a sliding movement lengthwise ofv the v head for the purpose of changing the bearing between the rolls and levers, as presently to be set forth. A yoke 18 partially embraces the ring 14, resting iu the groove 15. This yoke is fastened to or made integral with a 1 sleeve 19, which is arranged tolslide upon'a shaft 20, which latter extends horizont-ally, as I;

shown in Fig. 2, and has no movement. I

21 is a gear, which is journaled in an ex- (No Model.) 4 sneezesheen 1.

G.'SEYBOLD. BOOK TRIMMING MAGHINB. No.1442,295. Patented DemQ, 1890.

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