US116517A - Improvement in adjustable tool-rests for lathes - Google Patents

Description

frvrrED .STATES PATET Y' JOSHUA S.V WHEELER, ASA WHEELER, AND. ORANGE WHEELER, OF WOR- OESTER, MASSACHUSETTS.

IMPROVEMENT IN ADJUSTABLE TOOL-RESTS FOR LATHES.

Specification forming part of Letters Patent No. 116,517, dated June 27, 1871.

To all whom 'it may concern:

Beit known that we, J osHUA S. WHEELER, AsnL N. WHEELER, and ORANGE WHEELER, all of the city and county of Worcester and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Adjustable Tool-Rests for Engine-Lathes; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawing which forms apart of this specication, and in which- Figure lrepresents a side view of our improved tool-rest. Fig. 2 represents a longitudinal central section, and Fig. 3 represents a transverse central section.

To enable those skilled in the art to which our invention belongs to make and use the same, we will proceed to describe it more in detail.

The nature of our invention consists in certain improvements in adjustable tool-rests, as hereinafter described.

In the drawing, the parts marked A represent the carriage, which is supported upon the bed of the lathe, and' is arranged and operated in the ordinary manner. B indicates the base of the puppet-block, and is arranged to slide back and forth upon the carriage A, to which it is attached byfmeans of a dovetailed projection, b, that lits into a longitudinal groove of corresponding shape formed in the upper part of the carriage A. The top of the base-piece B is formed arching, and is provided with a dovetailed projection, D, of corresponding curvature at its central part throughout its entire length, as shown. G indicates the puppet-block, which is fitted upon the upper arched portion of the base-piece B, andretained by the dovetailed projection D in such a manner that it can be moved backward and forward over the arched surface to raise and depress the point of the cutting-tool and adjust it to the proper height and position. A strip of packing, E, is arranged between the side of the dovetailed projection D and the block C, which strip can be clamped up against the side of the projection D by means of screws d, set in the side of the block C, as shown in Figs. 1 and 3. The puppet-block O is grooved out at its under side, and in its interior is fitted a rack, F, which meshes with a segment-gear, G, secured rigidly to the upper part of the base-piece B, as illustrated. I indicates an adjusting-screw, which is arranged lonis provided with` a suitable hand-wheel, J, or crank upon its outer end, by means of which it can be conveniently operated. The screw-spindle I has its bearing in and is supported by the end plate K of the block C, and it is held from any longitudinal movement independent of the puppet-block C by a collar, L, at the inner side of the plate, and the hub of the handwheel J at the outside of the plate. As the screw 'I is turned the relative position of the rack F within the' block changes, but the teeth of the rack, being interlocked with the teeth of the stationary segment G, prevent the rack from moving longitudinally, and the result is that the block C receives the motion and is carried along the curved surface of the base-piece B, thereby elevating or depressing the point of the cutting-tool, according to the direction in which the screw I is revolved. When the puppet-block C is swung over to the front or rear, the rack F rolls down upon the segment G, so that the same number of teeth will be in mesh between the two at whatever position the block may be adjusted. The block is provided with a lateral groove at its top to receive the puppet and tool, which parts may be constructed and arranged in the ordinary. manner, and consequently require no description. It will be observed that when the point of the tool is elevated the puppet-block is drawn backward, and when the point of the tool is depressed said block is moved forward over the arch of the base-piece B, therebyr changing the inclination at which the tool stands, and thus always prel serving the proper relative position oranglebetween the cutting-point of the tool aud the surface of the work, whether the latter is of large or small radius or curvature. By arranging the concave puppet-block upon the top of the convex base piece, all dust, dirt, chips and other clogging matter falling upon the puppet-block will not be liable. to work in and clog the operative parts of the tool-rest, sincethe tendency of such clogging substances is to slide off or drop from the puppet-block, the latter serving as a roof to shelter and protect the internal mechanism.v It will also be seen that our adjustable tool-rest is simple in its construction and arrangement, and not liable to become deranged or get out of order. Allof the internal parts are closely, incased by the outer shell, so as to preclude the gitudinally through the rackF and block C, and

entrance -of chips and dirt to the interior. rest supports the tool rigidly and firmly in any Y ofritspositions, and can be securely held at such adjustment by lturning,` in the packing-screws d, and thereby clamping the packing-strip against the side ofthe projection-D. The segmentgear G may be made in a separate piece from the base B, and set in and secured by screws, as shown in the drawing; or the base may be cast full and the gear-teeth cut directly upon its upper surface. Y Having described our improvements in adjustable tool-rests for engine-lathes, what we claim therein as new and of our invention., and desire to secure by Letters Patent, is-

1. The combination, withithe base-piece B, provided with a stationary segment-gear, Gr, of

The-

Witnesses:l THos. H. DODGE,

Urns. H. BURLEIGH.

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