Safety system for closing doors

B - Operations – Transporting – 66 – B

Patent

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364/26

B66B 13/26 (2006.01) E05F 15/00 (2006.01) E05F 15/20 (2006.01) H03K 17/795 (2006.01) H03K 17/975 (2006.01)

Patent

CA 1265880

ABSTRACT OF THE DISCLOSURE A capacitive safety system for controlling a door, e.g. an elevator door, so as to automatically avoid obstacles, employs electronic control for antennas operating as capacitive measuring elements for establishing shield voltages of identical phase on the antennas and on shield voltage antennas to counteract ambient capacity variations. In order to improve the operation and safety of the elevator door, the elevator shaft door, which closes simultaneously with the elevator door, is provided with similar capacitive measuring antennas and electronic controls as the elevator door, as well as with similar shield voltage antennas, which operate on a shield voltage having the same phase as that of the elevator door. Operation of the elevator shaft door and the elevator door with identical phases is effected by means of a wireless shield voltage transfer unit.

537936

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