Liquid volume indicator

Details Liquid volume indicator Liquid volume indicator

1982-03-15

1985-10-22

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

73298, 73303, B60Q 100, G01F 2300

Patent

active

045491640

ABSTRACT:
A sensing device for determining the amount of liquid in an oil crankcase of a vehicle. A hollow dipstick, closed at one end and having a metering hole therein, is inserted into the crankcase of a car. The other end of the dipstick is connected by flexible tubing to a suction diaphragm and sensing diaphragm in a sensing module. The suction bellows and sensing diaphragm are linked together and to the dipstick by branches of a T-tubing. An opposed end of the suction diaphragm is connected to a piston of a solenoid. The sensing diaphragm is mounted to move in response to the amount of oil suctioned into the dipstick. An electrical circuit is formed between a push button, a solenoid, ground, and the car battery, such that, when the push button is closed, the solenoid becomes excited, drawing in the piston to thereby move the suction diaphragm. Movement of the suction diaphragm draws oil into the dipstick. An electrical current is coupled to the sensing diaphragm to indicate if oil is drawn up or samples in the dipstick.

REFERENCES:
patent: 2588761 (1951-04-01), Raby
patent: 2717991 (1955-09-01), Sherman
patent: 2728070 (1955-12-01), Kelly
patent: 4417232 (1983-11-01), Tewfik

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