US260005A - Losing e - Google Patents

Description

L. R. DAVIS.

K LAT'HB ,G11-LUCK.

(nudeln.)

,005. Patented June 27, 1882,..-

liv

UNITED STATES- PATENT OFFICEC LORING It. DAVIS, OF ADRIAN, MICHIGAN, ASSIGNOR OF ONE-HALF TO SYLVESTER I. BABOOOK, OF SAME PLAGE.

LATHE-CHUCK.

SPECIFICATION forming part of Letters Patent No. 260,005, dated June 27, 1882,

Application filed September 20, 1880. (Model.) y

To alt whom it may concern:

Be it known that I, LoRiNe R. Davis, a citizen ofthe United States, residing at Adrian, in the county of Lenawee and State of Michigan, 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 the invention, such aswill enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or gures of reference marked thereon, which form a part of this specification, in which- Figure 1 is a side view of the lathe spindle and chuck; Fig. 2, an end view of the chuck; Fig. 3, a section of chuck and spindle through the line a: .fr of Fig. l; Fig. 4, a rear end view of the chuck-head, showing it chambered 5 Fig. 5, a side view of the chuckface-plate separated from the spindle; Fig. 6, detailed views of clamping-plate, its rod, and fastening-plate F; Fig. 7, detailed views of spring, steadyingplate, and back plate.

My invention relates to lathes designed more y especially for jewelers use or other fine work, although adapted for other turning-lathes; anditconsists in the construction and combination of parts hereinafter described, and sought to be pointed out in the claims, whereby the article worked upon can bereadily centered and the parts quickly clamped so as to hold it in position.

In the accompanying drawings, the letter A indicates the head of the chuck, which is chambered from the back, so as to leave a rim, a, on the inside of which is formed a seat, b, against which bears the back plate, B, the outside face of which is liush with the edge of rim a, or preferably below it, so that the edge of the rim will take the pressure against the face-plate hereinafter referred to. This 'plate B is prevented from turning and is held to its seat by means of screws passing into theplate near its edge, the heads of the screws being cut so as to leave square or sharp edges thereto, which fit against the inside of rim a or into notches that may be made therein.

Inside the chamber of the head A there is placed a conically-coiled or other spring, D, to

the apex or top of which is secured a steadying plate or disk, E. A clamping-plate, F, of' smaller diameter than the chamber of head A, lits between the spring D or its disk and the back plate, B, and to it there is secured one end of a tightening-rod, G, which passes through an opening, c, somewhat larger in diameter than the rod in the back plate, B, and then through 4a face-plate, H, which is of larger diameter than the head of the chuck, the said face-plate being secured fixedly to the end of the hollow spindle I. The end of the tightening-rod is threaded, so that a left-hand nut, J,

may screw thereon and bear against the end Y of the spindle.

The rod G is provided near the back plate, B, with a feather, d, which lits into a groove, c, formed in the spindle I, so that the rod G will turn with the spindle at the same time that the head A turns with the spindle and face-plate byreason of the head being clamped to the face-plate by screwing down the nut J.

Any of the well-known clamping-jaws suitable for-the purpose are secured to the face of the head A, so as to hold the work. The power of the spring D is such that it will press the clamping-plate F against the back plate, B, with sufficient force as by friction to hold the two plates together at any point to which the head A may be moved within the radius of the opening c in the back plate.

In operation, after the work-piece has been iixed between the clutch-jaws, the lathe is set in motion and the work centered by pressing against the head of the clutch or the work itself. The nut at the end of the rod is then screwed up, thereby drawing the head up against the face-plate Il, and holding it by pressure tightly against that plate, and the work to its center to which it has been adjusted, as described.

If the spring D from any cause should not be able of itself to hold the head to any adj ustment given to it afterA the work has been clamped in place, the uut J may be run partially up, so as to give a gentle pressure to the head and permit it to be moved by the workman.

This chuck can be cheaply manufactured. It is simple in construction and not easily put out of repair, and is very effective in operat- IGO ing, admitting of accurate and quick centering plate, B, and face-plate H,in combination with ofthe work. threaded rod G, provided with plate F and Having described my inventionmhatIclaini feather d, spindle I, having groove e, and left- 15 is hand nut J, the several parts being arranged 1. In a lathe, the head A, inclosng a spring to operate as set forth. and provided with abaekplate,B,titting below In testimony whereof I aiiix my signature in the edge of rim a, in combination with a clamppresence of two Witnesses. ing-plate, F, located between the spring and back plate, and connected to a rod passed LORING R' DAVI' through a lwiow spindle and operated on by a nut, substantially as set forth.

2. In a lat-he, the head A, spring D, back I IVitnesses ORSAMUS LAMB, J. E. SCHNELL.

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