Garage door up-returner and circuit breaker
    9.
    发明授权
    Garage door up-returner and circuit breaker 失效
    加油门上回路和断路器

    公开(公告)号:US3590529A

    公开(公告)日:1971-07-06

    申请号:US3590529D

    申请日:1969-03-18

    申请人: PURDY FREDERICK A

    发明人: PURDY FREDERICK A

    IPC分类号: E05F15/16 E05F15/20

    摘要: An Up-Returner for an obstructed downwardly moving overhead garage door; a Circuit Breaker, two-directional. I. At an operator for driving an overhead garage door open or closed; a door, moving downward toward closed position and encountering an obstruction, is automatically reversed in direction to fully reopen. II. Integral with the parts of assembly I, is a circuit breaker to shut off an overtime-running motor by breaking the electricsupply circuit, whether motor''s direction of rotation is clockwise or counterclockwise. III. Improvements over prior designs.