Remote indicating dip stick
US4881486A · kind A · utility
Inventor
Key dates
| Filing date | Oct 4, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Oct 4, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A manually operable fluid level indicator as illustrated for indicating at a location remote from a reservoir whether the fluid level in the reservoir has fallen below a predetermined level. A hollow dip stick having an aperture through a side wall of a lower end thereof depends into the reservoir and is normally covered by fluid within the reservoir. An indicator housing has chamber communicating with the interior of the dip stick and has a piston moveable therein by a friction drive connection with a manually moveable plunger. On moving the plunger outwardly of the housing, the piston remains stationary if a vacuum condition exists in the conduit communicating between the dip stick and housing. If the fluid level falls below the orifice and allows air or gas to enter the conduit running to the chamber of the housing, the piston will move with the plunger when the latter is pulled outwardly of the housing and the movement of the piston is visually observed to indicate a low fluid level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.