Door status detector apparatus

Details Door status detector apparatus Door status detector apparatus

1979-11-13

1981-07-14

Pitts, Harold I.

Communications: electrical

Condition responsive indicating system

Specific condition

3403091, G08B 2100

Patent

active

042789680

ABSTRACT:
An apparatus is disclosed which creates a signal that indicates when a door has remained open for a predetermined amount of time. The apparatus includes a switch element responsive to the opening of the door and the closing of the door for monitoring the positional status of the door. The apparatus further includes electrical circuit components responsive to the monitoring switch for detecting when the door has been open for the predetermined period of time. The apparatus also includes electrical circuit components responsive to the detecting components for generating the signal indicating that the door has been open for the predetermined period of time.

REFERENCES:
patent: 3771154 (1973-11-01), Takei
patent: 4155077 (1979-05-01), Rohan
patent: 4160972 (1979-07-01), La Mell

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