Electromagnetically controlled cat flap
US4991350A · kind A · utility
21Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1989 |
| Grant date | Feb 12, 1991 |
| Priority date | — |
| Expiry date | Sep 1, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B7/32
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.