Animal husbandry – Milkers – With signals – indicators – registers – and timers
Patent
1978-05-30
1980-08-12
Eskovitz, Jay N.
Animal husbandry
Milkers
With signals, indicators, registers, and timers
49171, E05B 6500
Patent
active
042167434
ABSTRACT:
A magnetically actuated pet door is disclosed which allows only the owner's pet, such as a cat or dog, to enter. The door is hinged at the top to open in both directions for ingress and egress, but is prevented from opening in the ingress direction by a solenoid-actuated, one-way latch comprised of a plunger against the inside of a flap that is in turn hinged on the inside of the pet door, and held flat against the pet door by springs. A notch in the pet door behind the flap permits the door to swing freely open in the egress direction without the solenoid being energized to withdraw the plunger. A permanent magnet attached to the collar of a pet induces a signal in magnetosensitive devices disposed on the outside of the pet door. That signal is processed to energize the latch solenoid and thereby withdrawing the solenoid plunger from the path of the flap on the pet door to allow the pet to ingress.
REFERENCES:
patent: 3465724 (1969-09-01), Broadbent
patent: 3557757 (1971-01-01), Brooks
patent: 3816709 (1974-06-01), Walton
patent: 3897753 (1975-08-01), Lee et al.
patent: 4022263 (1977-05-01), Beckett et al.
patent: 4047331 (1977-09-01), Davlantes
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