Safety system for closing doors

Details Safety system for closing doors Safety system for closing doors

1987-05-26

1988-06-28

Skaggs, H. Grant

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 52R, 187104, 49 26, B66B 1326

Patent

active

047533234

ABSTRACT:
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.

REFERENCES:
patent: 3017957 (1962-01-01), Lund et al.
patent: 3370677 (1968-02-01), Federmann et al.

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