Tire pressure indicator integral with tire stem
US4310014A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 1980 |
| Grant date | Jan 12, 1982 |
| Priority date | — |
| Expiry date | Jun 27, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/3662
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
To provide a visual indication of low tire pressure, a valve stem comprises a base for mounting to a tire rim, an outer nipple portion containing a tire stem valve, and an intermediate convoluted portion connecting the base and the nipple. An inner extension of the nipple passes through the base portion and has its inner end secured to a spring which is compressed between the extension and the base portion to urge the nipple toward the tire rim against the force of the tire pressure so that the spacing of the nipple from the rim is a measure of tire pressure. A transparent cylinder surrounding the valve stem and secured to the base portion contains a window for viewing an indicia mark on the nipple, the indicia being placed to provide an indication of low tire pressure when it is visible through the window.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.