Shutter control apparatus

Details Shutter control apparatus Shutter control apparatus

1987-01-27

1989-01-10

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 64, 160 1, 160133, H02J 906

Patent

active

047975679

ABSTRACT:
A shutter control apparatus is disclosed for providing an auxiliary power source to drive a shutter motor. A double-pole, double-throw switch selectively connects an electric shutter motor to a primary electrical source of power or, when the primary source of power is interrupted, is switched to connect a self contained auxiliary power source to the shutter motor so as to permit extension and retraction of the shutter door.

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