Pet door with control circuit therefor

Details Pet door with control circuit therefor Pet door with control circuit therefor

1983-04-19

1985-02-05

Downey, Kenneth

Movable or removable closures

Condition responsive control

49169, 119 51R, E05F 1520

Patent

active

044971338

ABSTRACT:
A control circuit for unlatching a door, particularly a pet door, includes a transmitter coil (L1), a pulse driver (11) for pulse energizing the coil, and a discriminator (12, 13) for detecting a.c. components in the coil current caused by currents induced in an outside tuned circuit brought adjacent the coil, e.g. around the neck of a pet seeking entry, and for comparing the frequency of the a.c. components with a standard. A latch drive circuit (14) responds to the discriminator for operating the door latch if the frequency comparison is satisfactory.

REFERENCES:
patent: 3465724 (1969-09-01), Broadbent
patent: 3897753 (1975-08-01), Lee et al.
patent: 4129855 (1978-12-01), Rodrian
patent: 4216743 (1980-08-01), Cohen

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