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    • 3. 发明专利
    • Improvements in or relating to safety gear for lifts or hoists
    • GB447607A
    • 1936-05-21
    • GB2720534
    • 1934-09-21
    • HAMBROOK RUSSELL JONES
    • B66B5/20
    • 447,607. Catch-gear for mine cages. JONES, H. R., 24, Porden Road, Brixton, London. Sept. 21, 1934, No. 27205. [Class 78 (iii)] In catch - gear for lifts, hoists, and the like, of the kind in which the breaking of the suspension rope causes a member to move relatively to the cage or platform and thus apply cams to the guide rails, the connecting link between the cams and the movable member is formed by a flexible extensible member. The invention is shown applied to a hoist with an overhung platform moving in a pair of vertical guides. The suspension rope 3, is connected to a sliding frame 6 which supports the platform through the agency of a spring 7 bearing against a cross-bar 22. The downward movement of the member 6, on breakage of the suspension rope, causes springs 8 to rotate the shaft 9 and thus apply cams 10 to the guides. The contacting surface of the guide may be lined with brake-material and the cam-shafts 9 supported by U-shaped straps 11 associated with resilient packing 12 to avoid shock and undue strain on the mechanism in working. Springs 16, acting directly on the cam-shaft, assist in applying the cams in ordinary circumstances and also act to apply them in emergency, should the springs 8 fail. The springs 8 and cams 10 preferably are duplicated, so that one cam is applied to each guide rail. A bar 14 maintains the frame 6 in its raised position when the cage rests on the bottom of the shaft, thus preventing the action of the cams at this point.