Door alarm system

Details Door alarm system Door alarm system

1977-04-20

1978-11-07

Swann III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6193, 200 6177, G08B 1308

Patent

active

041248473

ABSTRACT:
A door switch is mounted on a door and has a switch arm coupled to the door frame. The door switch is open when the door is closed and is moved to closed position when the door is opened at least approximately 35.degree.. Electrical conductors electrically connect an alarm, an ON-OFF switch and the door switch in circuit to a source of electrical energy whereby when the ON-OFF switch is closed and the door is opened beyond approximately 35.degree., the alarm is actuated.

REFERENCES:
patent: 3585625 (1971-06-01), Prinsky et al.
patent: 4035791 (1977-07-01), Katayama
patent: 4060704 (1977-11-01), Cole

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