Pressure switch for monitoring tire pressure, particularly of motor vehicle tires
US4894639A · kind A · utility
15Cited by
2References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1989 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | Mar 24, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C23/0408
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pressure switch for monitoring a tire pressure of a motor vehicle tire is fastened to a wheel rim and is actuated by the inflating pressure in the tire. The pressure switch comprises a reference pressure chamber which is sealed off by an electrically conductive switching diaphragm in the direction of the tire, and carries a contact pin interacting with this diaphragm. The switching diaphragm has a mass which is controlled as a function of centrifugal force in response to tire rotation such that the switching point of the pressure switch can be changed automatically as a function of vehicle speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.