Improvements in or relating to lathe and like tailstocks

摘要

806,389. Lathe-details. JEANNERET, J. L. April 10, 1956 [April 14, 1955], No. 10919/56. Class 83 (3). A high-speed feeding-device for a lathe or like tailstock comprises a plunger slidably carried in a casing rigid with the tailstock and adapted to produce a quick motion of the normal screw-control movement of the tailstock-sleeve, the plunger being moved by a roller &c. connected to a crank and rotatable by a handle mounted on an axis perpendicular to the tailstock-axis, the roller engaging a transversegroove in the plunger. A housing 1, Fig. 2, carrying the quick-action device, is secured to the rear of the tailstock-housing 2, and the normal screw 9 moving the centre-sleeve 3 is controlled by the hand wheel 10. A hand-lever 8 is secured to a short spindle at right-angles to the tailstock-axis and rotatable in bearings 23, 24 in the housing 1. This spindle has a crank 11 at its inner-end carrying a roller 12 which engages a transverse-slot in the underside of a longitudinally-slidable member 17, Fig. 4, arranged within the casing 1 and bored to allow the operating spindle of the slow-motion adjusting-handle 10 to pass therethrough. The member 17 transmits quick-action movement to the tailstock-centre through collars 27, 28, 18, and a spring 16 which allows for expansion. The slow-motion feed may be locked by screwing-up a set-screw 19 to engage a collar 20, which is prevented from rotation by a pin 21 slidable in a hole in the casing 1. Alternatively, the quick-motion device may be locked by a set-screw 25 when the tailstock is used for drilling operations. A pin 14 fixed to the housing, Fig. 4, moves relatively to a slot 15 adjacent the handle 8, and limits the movement of the latter.