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    • 10. 发明专利
    • Improvements in or relating to a power assister for manually operated mechanisms
    • GB673533A
    • 1952-06-11
    • GB1908448
    • 1948-07-16
    • CHADBURNS LIVERPOOL LTDDENBY CHADBURN BAMFORD
    • G08B9/08
    • 673,533. Order-telegraph signalling apparatus. CHADBURNS (LIVERPOOL), Ltd. and BAMFORD, D. C. June 10, 1949. [July 16 1948] No. 19084/48. Classes 40 (i) and 118 (ii). In a manually operable mechanical remote control installation (e.g. mechanical telegraph, steering mechanism transmission system for controlling valves, ventilators, etc.), the operating handwheel has a hand-grip part proper which is permitted limited movement relatively to the wheel in relation to switch mechanism controlling a power assister, so that pressure on the hand-grip automatically brings the power assister motor into operation. As shown in Figs. 1, 3 and 5, the transmitting handwheel 12 of a ship's "order" telegraph drives the receiver pointer 14 directly through shafts 16 and gears 17. In applying pressure to the hand-grip 29, which is carried independently of the handwheel on a member 30 pivoted at 31, about 5 degrees of most motion, determined by the movement of an abutment 33 in slot 32, is first taken up, and in so doing the abutment closes one of a pair of contacts 40, 41 and 42, 43 connected through slip-ring on the handwheel shaft to an electric motor 20. Dependent on the contact pair closed, the motor rotates shafting 21 in the correct direction to give power assistance to the handwheel. A magnetic clutch 23, also operated by the contacts, is included in the motor drive, to ensure the drive is removed immediately it is desired to bring the handwheel to rest. The clutch also relieves the installation of the assister load when manual operation alone is required. Spring loaded lever 37 engaging a roller member 34 restores the hand-grip to the central position. To prevent hunting when the handwheel is brought to rest, delayed action relays may be included in the motor and clutch circuits, a dash-pot device may damp the handwheel motion, or the magnetic clutch may include lost motion. A similar arrangement including motor 25 provides power assistance for the "revolutions required" handwheel 13. According to the Provisional Specification, the contact system may comprise a leaf spring which is displaced by movement of the handwheel to contact one of two screw contacts, the centering mechanismcomprising a star wheel co-operating with spring loaded rollers or notches which snap into engagement with the teeth. Specification 650,691 is referred to.