Early warning electrical sound alarm system for pet door structu

Details Early warning electrical sound alarm system for pet door structu Early warning electrical sound alarm system for pet door structu

1980-05-27

1982-08-31

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

119 1, 160 10, 200 6174, 200 6193, 340546, 340568, G08B 1308, G08B 1314

Patent

active

043475027

ABSTRACT:
The present invention provides an early warning sound alarm system for signalling unauthorized entry or attempted entry through a pet door when the pet door is covered and not in use. The alarm system in accordance with the invention, comprises in combination: a pet door including a frame defining a passageway therethrough, and a flap swingably mounted on the frame adjacent the upper edge of the passageway for swinging movement in either direction therethrough; a covering member removably secured to one side of the frame adjacent the flap for preventing entry through the passageway; and an electrically powered sound alarm, including a sound signal box, and a switch such as a leaf spring biased limit switch disposed between the flap and the surface of covering member adjacent the flap. The switch is suitably positioned to maintain the sound signal box in a deactivated state when the covering member is secured on the frame to prevent entry through the passageway. In one embodiment, the sound signal box contains a trip switch which activates the sound alarm in the event a removably secured second covering member is moved or removed from the pet door frame.

REFERENCES:
patent: 913669 (1909-02-01), Munsell
patent: 1012590 (1911-12-01), Bobo
patent: 1319416 (1919-10-01), Pease
patent: 2758646 (1956-08-01), Johnson
patent: 3259709 (1966-07-01), Hemmens
patent: 3567882 (1971-03-01), Beck
patent: 3706090 (1972-12-01), Callaghan
patent: 3768087 (1973-10-01), Kaye et al.

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