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    • 1. 发明专利
    • Improvements in or relating to switching apparatus for telephone systems
    • GB264616A
    • 1927-01-27
    • GB2799125
    • 1925-11-06
    • AUTOMATIC TELEPHONE MFG CO LTDJOHN SAVINROBERT EDWARD BOYD
    • H01H67/06
    • 264,616. Automatic Telephone Manufacturing Co., Ltd., Savin, J., and Boyd, R. E. Nov. 6, 1925. Automatic exchange apparatus.-The parts of single-motion rotary switches more particularly of the kind described in Specifications 131,716, and 179,157, for use, for instance, for controlling impulses in a register sender, are modified in construction and material to improve their wearing qualities and ease of replacement. Construction. The wipers 10 are of the shape shown and are suitably spaced, insulated at 22 in pairs, and held from rotation between a flange and a nut 26, Fig. 4, on an insulated metal tube 14. The wiper unit is fixedly mounted on a tube 28, Fig .3, on the ratchet wheel 27. The tube 28 is journaled on a spindle 31, Fig. 1, which is positioned in bearings in the frame 32 by a catch 35. The pawl 51, Fig. 1, is U-shaped in plan, the base thereof having a projection 52 engaging the ratchet and an enlargement 62 engaging a hexagonal stop-nut 63.. The pawl and ratchet lie in the same vertical plane, Fig. 1. The armature 49, 50 of the magnet 42 is journaled on a pin removably fixed by a catch 47 in extensions 46 of the U-shaped yoke 45. The arm 50 carries the pivoted pawl 51, a removable shoe 55 engaging with the armature spring 56, and a projection fitted with an insulation bush 57 for operating the interrupter springs 58, 59. The bank contact frame is adjustably mounted on the frame 32. The number disc is formed by a metal stamping having a graduated cylindrical edge. An adjustable detent spring 64 is provided. The armature is adjustable by a cam arm 60. Materials. The wipers, the wiper contact springs, the detent spring 64 and the bank contacts are made of nickel silver alloy, the latter being of harder temper than the wipers. The ratchet wheel is of tobin bronze, while the pawl is a steel stamping, the projection 52 thereof being hardened. The shoe 55 is of hardened steel. The insulation is of phenol fibre, the bush 57 being alternatively of ebonite or the like.