利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

96 条记录 (耗时 0.027 秒)

    Safety mechanism for presses, machines and fixtures
    2.
    发明授权
    Safety mechanism for presses, machines and fixtures 失效
    压力，机械和设备的安全机制

    公开(公告)号：US4111232A

    公开(公告)日：1978-09-05

    申请号：US760414

    申请日：1977-01-18

    申请人： Robert W. Williamson

    发明人： Robert W. Williamson

    IPC分类号： F16P3/06 ,  F16K1/00 ,  F16K13/02

    CPC分类号： F16P3/06 ,  Y10T137/87869 ,  Y10T137/87909

    摘要： A safety mechanism including a hand restraint safety mechanism for use by an operator of a machine such as a press, special machine or fixture wherein (absent the present invention) the operator's hands are exposed to the hazard of being caught in the work area of the machine by moving machine elements when the machine is stroked. The hand restraints for the operator's hands are operatively coupled via cables with a fluidic power cylinder mounted in fixed dimensional relation to the machine with which the safety mechanism is used. This restraint cylinder is operative between restraining and released positions to control the length of each cable extended from a housing on which the cylinder is mounted. When the cables are maximally extended, the operator can reach into the machine to load or unload a workpiece. When the cables are minimally extended, the operator's hands are positively removed from the work area of the machine. A safety block mounted on the machine is operatively coupled with a second power cylinder for movement into and out of the work area of the machine. When the safety block is displaced into the machine work area, it mechanically prevents the machine elements from closing should the machine be accidentally stroked. A pneumatic control circuit is operatively coupled with the machine and includes multiple failsafe valves arranged to sense the operating positions of the cylinders and the machine for controlling the operation of the cylinders in a desired fashion. A cycle start signal to the machine is provided only when both the hand restraints and the safety block are retracted from the work area, and the safety block can be retracted only after the hand restraints have been retracted. The operator's hands are thereby maintained safe in a restrained position until the safety block is again extended into the work area after the machine has been stroked. After movement of all elements on the machine has terminated, the hand restraints are released to permit the operator manual access to the machine work area.