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    • 1. 发明专利
    • New or Improved Electro-magnetic Door-opening Apparatus.
    • GB190604653A
    • 1906-07-26
    • GB190604653D
    • 1906-02-26
    • SMITH GEORGEBAUSCHE FRIEDRICH
    • SMITH GEORGEBAUSCHE FRIEDRICH
    • 4653. Smith, G., and Bausche, F. Feb. 26. Door-opening apparatus.-Relates to an electromagnetic apparatus for unlocking and then opening a door. The bar 9 is connected at one end to the framework by the chain 7, Figs. 1 and 3, and is subject to the action of springs 25, 28, which are of unequal strength. A lever 30, pivoted at 29 to the casing 1 secured to the door, passes between the loose collars 24, 26 of the springs, and its end 31 is attached by means of the chain 4 to the handle of the lock. Fig. 3 shows the device when the door is closed, the spring 25 being then under compression. On completion of the electric circuit by means of the switch 20, the cores 38 of the electro magnet 16 attract the lever 36 and release the lever 35 from the catch 39 and the lever 30 from the catch 35. Under the action of the spring 25, the lever 30 is urged to one side, withdrawing the bolt and compressing the spring 28, which, acting on the sliding bar 9, opens the door, the detent mechanism being again brought into engagement. As the door is closed, the bar 9 is moved to compress the spring 25. The device may be used for a group of doors.