Pumps – Condition responsive control of pump drive motor – Plural pumps having separate drive motors – supply sources,...
Patent
1998-02-06
1999-02-02
Freay, Charles G.
Pumps
Condition responsive control of pump drive motor
Plural pumps having separate drive motors, supply sources,...
417286, 417253, 45412, 4509, F04B 4106
Patent
active
058656014
ABSTRACT:
A safety device for avoiding entrapment at a water reservoir drain by using a vacuum operated switch to interrupt power to the reservoir pump and by using a pressure pump to generate a positive pressure to dislodge the obstruction from the drain should a blockage occur. In addition, a manual reset switch requires human intervention to re-activate the reservoir pump once the blockage condition is removed.
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Freay Charles G.
Gartenberg Ehud
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