Road vehicle axle sensor
US6469266B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 9, 2001 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Apr 18, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H3/142
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An improved vehicle road sensor is provided for signalling the passage of a vehicle over a predetermined location on a roadway. The vehicle road sensor includes a membrane switch which includes a first member and a second member. The first member includes a non-conductive substrate, a pair of electrically-conductive stripes upon the non-conductive substrate, an electrically non-conductive gap separating the electrically-conductive stripes, and an electrically-conductive lead connected to each electrically-conductive stripe. The second member includes an electrically-conductive strip which is superposed upon the electrically-conductive stripes on the first member. The second member is normally out of electrical contact with the electrically-conductive stripes on the first member. The second member is sufficiently flexible, so that, under a compressive load, it deflects to shunt across the electrically non-conductive gap, thereby to permit electric current to flow from the electrically-conductive stripes to the second member. Various arrangements of separate, but connected sensitive zones may be provided along the length of the sensor. Vehicle wheels of different widths would activat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.