Signals and indicators – Indicators – Liquid level
Patent
1977-11-16
1979-08-14
Spar, Robert J.
Signals and indicators
Indicators
Liquid level
134113, 222156, G01F 2302
Patent
active
041641973
ABSTRACT:
A liquid level indicator for providing a visual indication when the level of liquid contained in a movably mounted tank is at or above a predetermined level, disclosed in conjunction with door-mounted rinse aid dispenser tanks for dishwashers, and includes an indicator knob having a stem portion acting as a closure for the tank filler opening accessible from the inside of the dishwasher door. A viewing chamber having a sight window is located in the end of the indicator knob with a feed reservoir arrangement causing liquid within the tank to flow by gravity into the viewing chamber when the door is closed, and a portion of the liquid being retained there upon opening of the dishwasher door, providing a visual indication that the level within the tank is at or above the predetermined level. Upon decline of the liquid level below the predetermined level, further flow into the viewing chamber no longer occurs and liquid in the viewing chamber is successively decreased by the return to the tank of liquid by successive door openings and closings to indicate the approach of a tank empty condition. Several variations of masking panels are disclosed cooperating with the sight window to provide a full and empty indication in conjunction with the presence and absence of liquid within the viewing chamber.
REFERENCES:
patent: 3152723 (1964-10-01), Perl et al.
patent: 3370597 (1968-02-01), Fox
patent: 3608514 (1971-09-01), Dunn
patent: 3980206 (1976-09-01), Hancock
General Electric Company
Reams Radford M.
Silverberg Fred A.
Spar Robert J.
Yungman Bruce A.
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