Fluent material handling – with receiver or receiver coacting mea – Automatic control of flow cutoff or diversion – Responsive to relative recession of supply means and...
Patent
1983-02-08
1985-03-05
Freeh, William L.
Fluent material handling, with receiver or receiver coacting mea
Automatic control of flow cutoff or diversion
Responsive to relative recession of supply means and...
417 36, 417411, 417424, B65B 104, B65B 310, F04B 4900, F04B 3504
Patent
active
045025150
ABSTRACT:
A useful dry battery driven liquid pump for pumping liquid such as kerosene or the like into a tank for an oil heater or the like very conveniently includes a combination of a motor and a liquid pump disposed at the lower end part of a suction tube, a plurality of dry cells contained in a dry battery casing, a liquid surface level detector disposed at the lower end part of a delivery tube and a control circuit which controls operation of the liquid pump properly in response to an output from the liquid surface level detector. The liquid surface level detector includes a prism formed at the lower end of a cylindrical detector body, a light beam generating element and a light beam receiving element. The liquid pump is driven as long as the prism does not get wet with liquid and thus light is reflected from the inner optical surface of the prism toward the light beam receiving element. The liquid pump stops pumping when liquid is filled up to the level where the prism becomes wet with liquid and thereby light beam passes through the optical surface of the prism without any reflection therefrom. To prevent liquid from flowing further through the pump after its operation is stopped, a communication groove is formed at the upper part of the suction tube through which the interior of the latter is communicated with the atmosphere.
REFERENCES:
patent: 2935099 (1960-05-01), Haynes
patent: 3135212 (1964-06-01), Todd et al.
patent: 3179033 (1965-04-01), Limberger
patent: 3814544 (1974-06-01), Roberts
patent: 3907009 (1975-09-01), Dobbins
patent: 4177021 (1979-12-01), Niedermeyer
patent: 4396353 (1983-08-01), MacDonald
Kazama Satoshi
Kobayashi Nobushige
Freeh William L.
Maruyama Industrial Co. Ltd.
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