Automatic door opener

Details Automatic door opener Automatic door opener

1997-04-16

1999-08-17

Redman, Jerry

Movable or removable closures

Safety means responsive to obstruction to closure

Closure drive stopping or reversal

49199, E05F 1502

Patent

active

059375795

ABSTRACT:
A door opener includes a motor in mechanical communication with a door, a first gas source for powering the motor, and a control system interposed to the first gas source and the motor. The control system includes a first pilot valve communicating with the first gas source at an inlet port and the motor at a motor port. The first pilot valve also communicates with a first flow control valve at an exhaust port. The first flow control valve regulates the speed of the door during closing and communicates with the first pilot valve at an inlet port and communicates with the atmosphere at an exhaust port.

REFERENCES:
patent: 3921335 (1975-11-01), Hewitt et al.
patent: 3938282 (1976-02-01), Goyal
patent: 5203110 (1993-04-01), Hormann

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