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    Power transmission mechanism
    17.
    发明授权
    Power transmission mechanism 失效

    公开(公告)号：US2296788A

    公开(公告)日：1942-09-22

    申请号：US41769241

    申请日：1941-11-03

    申请人： GRAHAM HORSTMANN BEVAN

    发明人： GRAHAM HORSTMANN BEVAN

    IPC分类号： G04B7/00

    CPC分类号： G04B7/00 ,  Y10T74/1914

    摘要： 539,798. Clocks. HORSTMANN, B. G., and HORSTMANN GEAR CO., Ltd. March 19, 1940, No. 5103. [Class 139] [Also in Groups XXIX and XXXVII] Power transmission mechanism for valves and electric switches comprises two sources of power transmitting unidirectional drive through transmission trains to a driven member, an antioverrun device being incorporated in at least one of the transmission trains for preventing the driven member from overrunning its drive. As shown, applied to a time-control device adapted to operate valves or switches, a driven member 18 may be driven either by the pinion 8 of a syncronous motor or by a clockwork motor having a going barrel 3. The pinion 8 gears with a disc 7 carrying a ring 11, the cylindrical inner periphery of the latter engaging three toggles 12 pivoted to a plate 13 and thus driving a plate 14 fast on the shaft 15. A disc 16 fast on the shaft 15 transmits the drive to a disc 19 fast on the member 18 by means of a pin 17 working with slight clearance in a slot 20. When the clockwork motor is driving, the drive from the going barrel 3 is transmitted directly to the disc 19 by a toggle 22 which is pivoted to the disc 19 and engages the inner cylindrical periphery of a ring 21 secured to the casing 3. To prevent overrunning of the member 18 whatever source is driving, a toggle member 24 is provided. This is pivoted at 23 to the disc 19 and has a circular end snugly engaging a portion 26 of a slot 25 in the discs 16. When the member 18 tends to overrun the end of the toggle 24 jams against the inner periphery of the ring 21. This jamming is caused by the pivoting of the toggle about the slot part 26 and is permitted by the relative movement between the discs 16, 19, allowed by the pin and slot connection 17, 20. The final gear 6 of an escapement train may mesh with teeth 5 on the barrel 3.