Signal generating tire valve
US5040561A · kind A · utility
Inventor
Key dates
| Filing date | Sep 7, 1990 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | Sep 7, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/3662
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A tire valve comprises means for generating a wireless transmittable pressure drop indicating signal. The valve comprises a valve foot attachable to a tire rim and a valve shaft extending from said valve foot. A signal generating means is mounted on said valve foot at a valve foot side remote from said valve shaft. Said signal generating means comprises a reference pressure chamber which is admittable with a desired pressure. A diaphragm defines said reference pressure chamber and is admittable with the tire pressure to be controlled. Further, said signal generating means includes a transmitter means, a power supply means and switching means which is regularly hold in an opened position, but which is closed with a diaphragm deflection, whereupon the transmitter means is activated. The transmitter circuit comprises a sequence control which terminates a signal transmission after a short duration thereof and resets the transmitter means in a state to become activated again.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.