Variable length dipstick
US5094008A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1991 |
| Grant date | Mar 10, 1992 |
| Priority date | — |
| Expiry date | Sep 9, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A variable length dipstick provides fluid level indications by contacting a stop within the sump. The dipstick is removably disposed within a guide tube. The dipstick has an upper element with a handle and a seal which contact the guide tube on insertion of the dipstick into the guide tube. A lower element is slidably engaged with the upper element. The lower element has marks to indicate the appropriate fill level. A spring is functionally disposed between the upper element and the lower element, tending to keep the dipstick extended to its full length. The resultant dipstick spring load produced by insertion and sealing of the dipstick is sufficiently low so as not to overcome the seal between the seal and the guide tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.