US39817A - Lathe for turning billiard-balls - Google Patents

Description

UNITED STATES PATENT OFFICE.,

LUTHER A. JOHNSON,- OF SAN FRANCISCO, CALIFORNIA.

LATHE FOR TURNING BlLLlAPtD-BALLS.

Specification forming part of Letters Patent No. 39,817, dated September 3, 1863..

clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this speciiication, in which- Figure l is a plan or top view of my invention; Fig. 2, a longitudinal vertical section of the sametaken in the line a: x, Fig. 1, Fig. 3, a transversevertical section ot' the same, taken in the line y y, Fig. l.

Similar letters of reference indicate corresponding parts in the several gures.

This invention consists in the employment or use of an adjustable tool-rest inconnection with a concave chuck and a revolving center, all arranged in such a manner that billiardballs and other spherical articles may be turned very expeditiously and in a perfect manner.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents the bed of a lathe,.and B the head which contains the revolving mandrel C, and D the head which contains the sliding arbor E, on which the center is secuied. The bed A and heads B D may be constructed in any of the usual or known ways. The revolving mandrel C has a chuck, G, attached to its inner end, said chuck having a concave face, a, forming a section of a hollowr sphere, as shown clearly in Fig. 2, and on the inner end of the arbor E there nis secured a socket, H, within whicha small rod, I, is itted and allowed to turn freely, said rod having a collar, b, upon it, which bears against the inner side ofthe front part of the socket, and the inner end of the rod I is pointed and is fitted or bears in a recess, c, in the arbor E. The outer part of the rod I projects through the front end of the socket H and has a screwthread cut upon it on which a cylindrical socket, d, is screwed to receive a piece of india-rubber, e, or other suitable yielding substance. The rod I is allowed to turn freelyin the socket H and forms a revolving center for the article being turned. (Seemoreparticularly Fig. 2, in which a ball shown in red is adjusted between the chuck G and rod I, the indiarubber e bearing against the ball.) By this arrangement the article to be turned is firmly secured in the lathe and rotated without being disiigured by center-points, as would be the case in ordinary lathes. This is an important feature of the invention.

J represents an adjustable tool-rest comprised of the following parts, to wit: A plate,

f, which is tted transversely in the bed A and is secured therein by a screw, g, and is provided at each end with a pendent lip, h, through which set-screws t' pass and bear against the bed A to admit of the plate f being properly adjusted in position. (See Fig. 3.) On the upper surface of the plate f there are two dovetail guides, jj, which are fitted between two similar guides, k le, at the under side of a circular plate, l, which has a pendent nut, m, attached to it, through which a screw, K, passes, said screw being on a rod which passes through the lower part of the head D, and has a hand-wheel, L, on its outer end. On the upper surface of the circular plate l there is an annular guide or way, u, which is fitted in an annular groove, o, in the under side of a circular plate, p, and at the center of the upper side' of the plateL there is a conical projection, q, which is iitted in a corresponding recess in the under side of plate p at its center. (See Fig. 3.) The plate p is secured to the plate l by a central screw, r. The plate p is allowed to turn freely on the plate l, and on" the upper surface of plate p' there are secured two ways or guides, s s, which are fitted,

between guides t t at the under side of a slide, u, which has an upright, c, at one end of it, in which the cutting-tool w is iitted. The slide u is adjusted by a screw., M, which has its bearing in an upright ledge, w', on an; arm, c', which projects horizontally from the plate p, said screw working in a nut, b', at.

the under side ot' the slide u.

From the above description it will be seen that the plates l p and slide u may, by meansA of the screw K and nut m, be adjusted in a direction longitudinally with the bed A of the lathe, and that the slide u may, by means of the screw M and nut b', be adjusted in a direction transversely with the bed A, and by adjusting these parts properly the tool w may be made by turning plate p to describe a semil ing to the size of the article to be turned.

After the operation above described, the ball in the lathe is changed in position so that its axis of rotation will be at right angles to that in which it rst operated upon, and the plate p is turned as before, which completes the work, all parts of the surface of the article being acted upon by the tool.

By this invention the article to be turned may be expeditiously centered in the lathe, the pressure of the bearing e against the article being sufficient to keep the latter in the chuck G so as to insure rotation.

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

l. The rotating center, formed of the rod I, provided with a collar, b, and fitted in a socket, H, on the arbor E, and also provided with a socket or cap, cl, to receive a piece of indiarubber, e, or other suitable yielding material, in combination with the concave chuck G, attached to the mandrel C, all arranged substantially as and for the purpose specified.

2. The tool-rest composed of the adjustable plate l, turning-plate p, and slide u, all arranged to operate in connection with the chuck and rotary center, for the purpose set forth.

LUTHER A. JOHNSON.

Witnesses:

Tiros. S. J. DOUGLAS, Y GEO. W. REED.

Images