Protective device for a water-pump apparatus

Details Protective device for a water-pump apparatus Protective device for a water-pump apparatus

1993-02-02

1994-08-23

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 18, 417 40, 417 44R, 200 84C, F04B 4904

Patent

active

053402812

ABSTRACT:
A protective device for a water-pump apparatus includes an upright hollow tubular member which is mounted on a top end of a pump unit of the water-pump apparatus, the interior of the tubular member communicating with an interior of the pump unit. A floating switch actuator is provided movably inside the tubular member and floats inside the tubular member in response to water level therein. The switch actuator is provided with a permanent magnet. A control unit is mounted on an outer surface of the tubular member and is connected electrically to a motor unit of the water-pump apparatus. The control unit includes a magnetically actuated switch which is activated by the switch actuator when the switch actuator is at a predetermined position inside the tubular member. The control unit cuts off power supply to the motor unit when the switch actuator ceases to float inside the tubular member.

REFERENCES:
patent: 2949126 (1960-08-01), Kuntz et al.
patent: 3469596 (1969-09-01), Branton
patent: 4736077 (1988-04-01), Valente

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