Movable or removable closures – Mounted for optional movements – One closure movable separately from or with other closure
Patent
1989-09-01
1991-02-12
Smith, Gary L.
Movable or removable closures
Mounted for optional movements
One closure movable separately from or with other closure
49394, 160180, 160 2, E06B 1100
Patent
active
049913506
ABSTRACT:
A pet door comprises a frame defining an aperture in which a flap is pivotally suspended so as to close the aperture when it hangs vertically. A pet such as a cat can push the flap either way to pass through the aperture when entering or leaving a house. Entry is controlled by a solenoid-operated catch which is energized when a magnet carried on a cat's collar enters the common detection zone of an array of reed switches disposed at the distal end of an extension of the bottom of the frame in spaced relation to the plane of the aperture.
REFERENCES:
patent: 4022263 (1977-05-01), Beckett
patent: 4134110 (1979-01-01), Galvin
patent: 4651793 (1987-03-01), Davlantes
patent: 4697383 (1987-10-01), Hagiwara
patent: 4776133 (1988-10-01), Green
Pet Mate Limited
Redman Jerry
Smith Gary L.
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