Vibration sensitive trip switch for vehicle alarm system of the like
US4496809A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1983 |
| Grant date | Jan 29, 1985 |
| Priority date | — |
| Expiry date | Oct 17, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R25/1006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A vibration sensitive trip switch for a vehicle alarm system or the like comprising a pair of juxtaposed generally coextensive cantilevered flat clock springs spaced one above the other. Each cantilevered spring is secured to a bracket. The upper spring extends horizontally over the lower spring with the latter canted toward the free end of the overlying spring, terminating spaced a predetermined distance below same. The springs have facing contacts at their overlying free ends, with a fine gap defined therebetween. The springs are movable in an uninhibited manner at their free ends and are weighted unequally thereat, the underlying spring carrying a greater weight than the overlying spring. A shock pad is located immediately below the free end of the underlying spring. The overlying spring is sensitive to shock caused by sharp jars resulting from impact against the windows or tires as would occur during attempted theft or vandalism. The underlying spring functions as a motion detector responsive to the lifting of the vehicle or other forward and/or backward motion thereof. The springs are each warp and temperature resistant and hence, the alarm will not be sounded due to extreme t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.