Sealed level control switch for sump pumps

Electricity: circuit makers and breakers – Float – Float and pressure

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73308, H01H 3518

Patent

active

040015335

ABSTRACT:
The control for electric sump pumps is operated by a pair of weights operatively attached to the control which has a sealed non-magnetic material housing having a downwardly open recess extending thereinto from its lower surface. A normally open microswitch having a spring control arm extending therefrom and movable downwardly to close the switch, while a permanent magnet is positioned on the arm directly above the recess, and a magnetic metal means is slidably positioned in the recess and operatively connects to the weights. The magnetic metal means attracts the permanent magnet when the metal means is at the upper portion of the recess and this closes the switch arm with the position of the metal means in the housing in relation to the magnet being controlled dependent upon the water level in the sump.

REFERENCES:
patent: 2576561 (1951-11-01), Binford
patent: 2887546 (1959-05-01), Hatfield et al.
patent: 3504316 (1970-03-01), Bekedam

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