Automatic float control switch for a bilge and sump pump

Details Automatic float control switch for a bilge and sump pump Automatic float control switch for a bilge and sump pump

1994-10-17

1996-10-08

Thorpe, Timothy S.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

200 84C, F04B 4904

Patent

active

055624235

ABSTRACT:
An automatic control for a liquid pump which assures that the pump starts when the liquid reaches a predetermined level and that the pump is stopped when the level has fallen to a second predetermined level. The control includes a permanent magnet mounted in a float which is contained within a float chamber and which has a bottom opening through which liquid can enter the float chamber. A top portion of the float chamber is provided with a one-way valve which allows air to escape from the float chamber but which prevents air from entering the float chamber so that when the float moves up with the liquid, the magnet actuates a magnetic responsive switch such as a reed switch to cause the motor to drive the pump. As the pump lowers the level of the liquid, the level of the liquid in the float chamber does not fall because of the partial vacuum within the top of the float chamber and the magnetic holds the switch closed so as to maintain energization of the pump. When the liquid falls to the bottom of the float chamber, air passes into the top of the chamber and allows the retained liquid to flow, and the float moves downwardly moving the magnet away from the magnetic responsive switch so that it opens and the pump motor stops. The float chamber and the magnetic responsive switch are remotely located from the pump.

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