Presettable speedometer for automotive vehicle
US3999441A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1975 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Jun 17, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P1/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A drum angularly entrained via a magnetic coupling by a shaft of a vehicular transmission, against a spring force, is linked via another magnetic coupling with a coaxial follower member carrying a printed circuit whose conductors are engageable by respective contact brushes normally spaced therefrom, the brushes acting as brakes upon being moved into contact with the conductors so as to arrest the follower member. An alarm device, which may emit a warning sound and/or carry out a control function, responds to a photoelectric sensor including a light emitter and a light receiver on the follower member coacting with a shutter on the drum, the sensor actuating the alarm device upon a relative displacement of the follower member and the drum beyond a selected relative angular position. A pushbutton, serving to bring the brushes into contact with the printed-circuit conductors, simultaneously connects the alarm device to its power supply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.