Tire air pressure system
US5491465A · kind A · utility
Inventor
Key dates
| Filing date | Nov 14, 1994 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | Nov 14, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C23/0467
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A tire air pressure system is disclosed for continuously monitoring the pressure of air in an inflatable tire of a vehicle or aircraft, and activating an audio and/or visual alarm when the air pressure drops below a predetermined level. An electrically conducting sensor is attached to a tire valve stem, and a decrease in air pressure causes a normally electrically insulated, spring biased piston to contact the sensor, thereby grounding the piston. The piston is electrically connected to an insulated disk having a conducting ring, mounted between a wheel and a hub. A contact brush disposed at the ring is connected to an alarm maintained at positive potential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.