Automatic assist for swing-door operator

Details Automatic assist for swing-door operator Automatic assist for swing-door operator

1989-05-12

1990-08-28

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388921, 318602, 318640, 49138, G05B 1928

Patent

active

049520806

ABSTRACT:
A manual power assist control employs a magnetic encoder which is mounted to a shaft of the door operator. The encoder generates pulse trains which are indicative of an attempt to open the door in a given direction. The pulses are processed to generate a signal for opening the doors in the event a manual attempt to open the doors is detected.

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patent: 4263536 (1981-04-01), Lee et al.
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patent: 4567411 (1986-01-01), Reimann et al.
patent: 4667480 (1987-04-01), Bessler
patent: 4727679 (1988-03-01), Kornbrekke et al.

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