Magnetically unlocked pet door
US4216743A · kind A · utility
Inventor
Key dates
| Filing date | May 30, 1978 |
| Grant date | Aug 12, 1980 |
| Priority date | — |
| Expiry date | May 30, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B7/32
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.