Signals and indicators – Indicators – Liquid level
Patent
1988-10-04
1989-11-21
Yasich, Daniel M.
Signals and indicators
Indicators
Liquid level
33722, G01F 2304, G01F 2306
Patent
active
048814865
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.
REFERENCES:
patent: 2539604 (1951-01-01), Woolley
patent: 3699914 (1972-10-01), Smith
patent: 3972234 (1976-08-01), Osojnak
patent: 4215574 (1980-08-01), Godeux
patent: 4235186 (1980-11-01), Frobose
patent: 4649746 (1987-03-01), Snow
Kevco Industries, Inc. Brochure, 1984.
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