Patent GB-575536-A (GB)
Title: A new or improved machine for cutting slits in lock nuts
IPC: B23G9/00
Filed: 1944-03-23
Abstract: 575,536. Making lock-nuts. BROCKHOUSE ENGINEERING (SOUTHPORT), Ltd., and HEARSON, J. G. March 23, 1944, No. 5396. [Classes 83 (ii), 83 (iii) and 83 (iv)] Milling machines; angular bending.-In a machine for cutting slits in lock-nuts, transverse to the axis thereof, or for performing similar operations, the nuts are placed between two rotating circular bodies, one within the other and eccentric thereto, one of the bodies having notches for receiving the nuts to carry them around a gap between the bodies and grip them at the narrowest part of the gap where they are operated upon by the cutting tool or tools. The slit nuts may subsequently pass beneath a roller which distorts them axially. A milling- machine for carrying out the operation comprises a frame 15, Fig. 5, mounted by horizontal trunnions 14 on a base 12 and supporting a driving motor 20 connected by spur gearing 23 and double reduction worm gearing 27, 32 to a sleeve 33 mounted on a shaft 35 carried by lower and upper bearmgs 46, 46<1>. Bearing 46 is mounted in a member 47 rigidly attached to the frame 15 and bearing 46<1> is mounted in a lever 37 pivoted at 38 to a bracket 39 on the frame and adjustably secured at the other end by a bracket 40 to the frame. The inner circular body 52 is mounted on the sleeve 33 and the outer body 42 is mounted on a sleeve 45 carried by a bearing 44 on the frame, dogs 50 on the worm-wheel 32 ensuring that both bodies rotate together. Adjustment of the bracket 40 varies the eccentricity between the bodies 42, 52 and so alters the work-gripping space between them. A removable ring 64, Fig. 11, attached to the body 52 has notches in the periphery to receive the nuts and press them against the inner periphery of a removable ring 59 on the body 42 whilst they are acted upon by milling- cutters 89 carried by shafts 86, Figs. 9 and 11, journalled in levers 85 pivoted on shafts 77. These shafts are mounted on a bracket 66 adjustable on the back plate 19 of the frame 15 by means of a screw 69 and graduated dial 72 so as to vary the axial position of the cutters relatively to the work. The cutters are driven at the same speed in opposite directions by intermeshing gears 79 on the pivot shafts 77, one of which engages a gear 74 splined on a shaft 63 driven at 62, Fig. 5, from the motor 20. Lateral adjustment of the cutters is effected by nuts 88, Fig. 9, engaging the levers 85 and screwing on a stud 8 attached to the bracket 66. The cutters may be mounted in a body which is angularly adjustable, to cut slits which are inclined to the axis of the nut. During cutting, the nuts are pressed down on the ring 59 by an arcuate guide 92 with bevelled ends which is supported on rods 90 attached to the bracket 66 and is urged downwardly by springs. Before being released by the bodies 42, 52, the slit nuts may pass beneath a bevelled roller 96, Figs. 5 and 7, to be deformed axially. The roller is carried by a yoked lever 99 pivoted at 98 to the bracket 39 and the deforming pressure is adjusted by a screw 101 and spring 104. The finished nuts are ejected from the space between the bodies 42, 52 before they reach the loading position, by means of an inclined finger (not shown) projecting into the space, and ejection into a receptacle may be facilitated if the frame 15 is adjusted about the trunnions 14 until the bodies 42, 52 rotate in an approximately vertical plane. Packing rings 51 between the bodies 42, 52 protect the bearings from swarf &c.