Door alarm controlled by operation of door lock

Details Door alarm controlled by operation of door lock Door alarm controlled by operation of door lock

1975-05-16

1977-07-12

Swann, Glen R.

Communications: electrical

Systems

Call station

70379R, 307 10AT, 340 63, G08B 1308, B60R 2510

Patent

active

040357910

ABSTRACT:
A burglar alarm device comprises a door lock fixed on a door, a switch closed by a locking operation of the door lock, a door switch closed by an opening operation of the door, an electric circuit which retains an energized state caused by a closing operation of the door switch when the first-mentioned switch is closed and an alarm controlled by the electric circuit.

REFERENCES:
patent: 1131278 (1915-03-01), Skinner
patent: 1743730 (1930-01-01), Rugg et al.
patent: 2839736 (1958-06-01), Tinsley et al.
patent: 2935730 (1960-05-01), Procter
patent: 3029424 (1962-04-01), Savage
patent: 3284593 (1966-11-01), Hawkins
patent: 3866164 (1975-02-01), Peterson
patent: 3936673 (1976-02-01), Kelly et al.

Affiliated with

Also associated with

Rating

Door alarm controlled by operation of door lock does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Door alarm controlled by operation of door lock, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Door alarm controlled by operation of door lock will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-491216