Electricity: circuit makers and breakers – Special application – Container contents level responsive
Patent
1981-04-28
1983-07-05
Caldwell, Sr., John W.
Electricity: circuit makers and breakers
Special application
Container contents level responsive
340617, 340663, H01H 3500, G08B 2100
Patent
active
043920322
ABSTRACT:
Apparatus for indicating the level of flowable material in a storage bin comprising a motor rotatably suspended by a spring within a protective enclosure and a drive shaft coupled by a ball-and-detent clutch to a paddle disposed within the bin to engage material therein. When the material reaches the level of the paddle, the drag on the paddle causes the motor to rotate within the enclosure and thereby to activate a switch disposed within the enclosure and coupled to the motor. A spring returns the motor to the switch-deactivated position when the material level decreases and the consequent drag is removed from the paddle. Electronic circuitry disposed within the housing includes field-selectable fail-safe circuitry for indicating either a high or a low material condition in the event of a power failure or the like independently of actual material level.
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Monitor Mfg. Co.--sales brochure, "Monitor Automatic Level Indicators" (1976), pp. 1, 2 and 9.
Berwind Corporation
Caldwell Sr. John W.
Myer Daniel
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