Low tire pressure transducer
US4337718A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1980 |
| Grant date | Jul 6, 1982 |
| Priority date | — |
| Expiry date | Jul 28, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S33/01
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A low tire pressure transducer coupled to a tire rim includes a diaphragm subject to tire pressure on one side and to a mechanical spring force on the other side. A magnet within the transducer is coupled with a shunt which minimizes the external magnetic field when tire pressure is at its proper value. However, movement of the diaphragm occasioned by low tire pressure also moves the shunt so that the external magnetic field increases substantially. Movement of the shunt also opens a valve which relieves any air pressure buildup in the transducer on the spring side of the diaphragm thereby avoiding premature actuation of the transducer due to air leakage into the transducer. A retaining ring holds the transducer to the rim and contains vents for allowing the exhaust of air from the transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.