Patent GB-190928077-A (GB)
Title: Improvements in Metal Turning Tools and Steady Rests.
Inventor: HARTNESS JAMES
IPC: B23B29/16
Filed: 1909-12-01
Granted: 1910-04-21
Abstract: 28,077. Hartness, J. March 13, [Convention date]. Turning.-A combined tool-holder and steadyrest for use in lathes of the type described in Specification 2108/09, has improved adjustments of the steadies and pivoted tool-carrier, whereby the tool is adapted to be shifted longitudinally as well as transversely of the work when the steadies are adjusted for smaller diameters. The roller steadies 30, two in number, are each held in a casing 32, antifriction balls 28 and a block 34 holding them in place, and the cap being secured by a pin 35 having a head 35a, Fig. 7, the head carrying a spring-pressed pointer pin 39 adapted to fit into holes in the top of the abutment screws 40, four in number, which are fixed in position by securing-bolts. The sleeves 32 are held in grooves in the body 25, so that they incline longitudinally of the work, and are adjusted to different diameters by the projections 37, 35<a>, Fig. 6, engaging the ends of the abutments 40, the pin 39 preventing dislocation when cutting takes place. When adjustment of the steadies to smaller diameters takes place, the ends of the steadies have motion longitudinally of the work as well as transversely, and a similar motion is adapted to be given to the tool, so that the relative positions of the cutter and steadies is unaltered. For this purpose, the cutter carrier 45 having two ears 46, 47, is pivoted on a bolt 51, which is supported in the body inclined in two directions in lugs 49, 50 of the frame, one end of the bolt being supported in a movable plate 53 which engages a cam 56 on the bolt and is moved by it in the slot 54 so that the ear 46 of the carrier is held fixed against the groove 48 of the body, the thrust on the tool being thus taken by the body. A bolt 58 is capable of adjusting the carrier in a direction longitudinally of the work. The carrier is also supported by an arm 60 connected by a pin 61 having an eccentric bearing in the tool-carrier, whereby, on rotating the pin by a handle 63, the tool-carrier is adjusted transversely to the work. The other end 65 of the arm carries a pointed screw 66 adapted to be engaged with the tops of four abutments for four positions of the tool, the screw 66 having an indicator 73 capable of motion over a scale on the end 65 to indicate any auxiliary adjustment given in cases of wear of tool, the arm 60 having a loop 70 which fits under the heads 71 of the abutments to prevent dislocation. Thus, as the carrier 45 is adjusted, due to the inclinations of the pivot bolt 51, the cutter has motion transversely of the work, and longitudinally, also in the direction in which the steadies are adjusted. The tool 80 is held in a shoe 81 which can be fixed against the projections 83, 84 on the tool carrier by a bolt 85. The projection 82 adjusts the front of the tool and this end is secured by a top plate 88 and bolt 89, Fig. 11. a lateral portion 86 of the shoe coacting with a lateral extension 87 of the top plate to act as chip deflectors. The outer end of the tool is held in place by a second cap 90 longitudinally slotted and provided with a bolt 92 and a washer, a second bolt 95 being capable of engaging grooves 96 in the tool for quick adjustment, the binding cap and tool being slid along the guides 91 until the projection 82 limits the motion, whereupon the screw 92 is forced home and secures the back end of the tool against motion.