Seat belt monitoring system and control device therefor
US3944970A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1974 |
| Grant date | Mar 16, 1976 |
| Priority date | — |
| Expiry date | Nov 1, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R2022/4816
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A system for monitoring usage of seat belt means in a motor vehicle includes electrically operable visual signaling means and electrically operable audible signaling means. A first switch is operable in response to initiation of motor vehicle operation for connecting the signaling means to an electrical power supply in the vehicle. An additional switch is operable in response to fastening of the vehicle seat belt means for preventing operation of the audible signaling means when the seat belt means are properly fastened. A pair of first electrical resistors of positive temperature coefficient of resistivity which are adapted to display a sharp increase in resistivity when heated to predetermined operating temperatures are arranged in series between the vehicle power supply and the visual and audible signaling means respectively for terminating operation of said signaling means individually when said first resistors are heated to said operating temperatures. A third electrical resistor of positive temperature coefficient of resistivity which displays a sharp increase in resistivity when heated to a predetermined operating temperature is arranged to be connected to said vehicle power…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.