Control system for roll-up doors

Details Control system for roll-up doors Control system for roll-up doors

1989-07-11

1990-07-03

Ro, Bentsu

Electricity: motive power systems

Motor-reversing

318466, H02P 122

Patent

active

049394339

ABSTRACT:
A control system for controlling the direction of rotation of the reversible D.C. motor is provided which includes a master control circuit and a slave control circuit which is selectively operable. The control circuit permits the movement of the door to be arrested at any time and to be reversed at any time by operating the master control and allowing similar control by means of the slave control when it is activated.

REFERENCES:
patent: 4369399 (1983-01-01), Lee et al.
patent: 4405923 (1983-09-01), Matsuoka et al.
patent: 4455517 (1984-06-01), Mitchell
patent: 4621223 (1986-11-01), Murakami et al.

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