Patent GB-190301687-A (GB)
Title: Improvements in and relating to Lathes
Inventor: POTTER JAMES CHARLES
Filed: 1903-01-23
Granted: 1903-05-14
Abstract: 1687. Potter, J. C., and Johnston, J. Jan. 23. Lathes.-A lathe, more particularly of the turret type, has a cone C and wheel D loose on the main spindle B and separately clutched to it by a clutch E operated by a handle e so that the lathe may be driven direct from a countershaft or by means of a cone shaft carryirg a cone K and geared to the wheel D. The cone shaft drives, bv spiral gears, a cross-shaft N carrying a friction disc 0 driving a disc P feathered on a shaft Q geared to the feedshaft W. The disc P can be moved across the disc 0 to vary or reverse the feed by a rack Y yoked to the disc and operated by a pinion Z and hand-wheel B'. The disc O is pressed against the disc P by a coiled spring on the cross-shaft. The carriage C<1> is traversed by rack-and-pinion gearing D', E', the pinion E<1> being mounted on a shaft F<1> geared to a shaft H', which carries a worm-wheel K<1> gearing with a worm L<1> carried by a rockiug frame pivoted on the feed shaft. The worm is integral with a pinion geared to a pinion feathered on the feed-shaft and moving with the carriage. The rocking frame is supported with the worm and wheel in gear by a tripping-lever, pivoted on the carriage and released by contact with a stop S<1> on a bar T<1> adjustably held in guides U<1> on the bed by a set-screw V<1>. The stop has a double bevel to release the rocking frame during movement of the carriage in either direction. The rocking frame can be released by a handle (not shown) and is re-set by a handle W'. The forward travel of the carriage can be positively stopped at two different points by screws X<1> journalled in a bracket. Y<1> on the bed and passing into slots on the underside of the carriage. Nuts Z', Fig. 8, sliding in the slots, can be adjusted longitudinally of the bed by turning the screws, and are separately engaged by a sliding block A<2>, which can be held by a spring pin B<2> so that it is clear of both nuts, as shown, or is in the path of one or the other of them. The block is moved by a pin a<1> projecting at the rear end of the carriage. A table C' is rotatably mounted on the carriage, and has a turret D<2> for boring and facing tools, and a cross-slide E' for turning-tools, preferably held in a turret F<2> on the slide The table can be held in two positions by a spring locking-bolt G<2> so that either turret is in the operative position next the lathe head. The locking-bolt is released by a handle L<2>, which is held in the disengaged position by a latch M' while the table is turned by hand. The table is further secured by clamps O<2>. The cross-slide is actuated by rack-and-pinion gearing from a vertical shaft, co-axial with the table and driven by bevel gearing from a shaft Y' driven from the feed-shaft W so that a power feed may be used for the cross-slide for any angular position of the table. Taper-turning may be effected by simultaneously feeding the carriage and the crossslide. The shaft Y<2> is driven by bevel gearing Z' and worm gearing E<3> from the shaft W, an ordinary friction clutch F' and hand. wheel C<3> being provided. A stop for the cross-slide consists of a plate adjustable along the ways of the slide by a screw and hand-wheel H<3> and engaged by a spring pin on the slide. To enable screws to be cut, a leading screw is mounted at the back of the lathe and is engaged by a half-nut on a rod sliding in the carriage and operated by a handle O<3>. The cabinet bed P<3>, Fig. 11, is divided into two compartments by a vertical partition p, one compartment serving as a tool cabinet and the other as an oil tank. The oil is circulated by a pump detachably coupled to the cross-shaft N, and returns through a screen p<1> placed over a settling- chamber p<3> in the oil tank, the suction pipe q<3> leading from a second chamber p<4>. An opening p<5> is provided for cleaning the chamber p<3>. Ribs p<6> intercept any oil flowing along the underside of the top or the side containing the opening.