Washer pump for selectively supplying wash fluid to two areas

Details Washer pump for selectively supplying wash fluid to two areas Washer pump for selectively supplying wash fluid to two areas

1997-04-04

1999-08-10

Lopez, F. Daniel

Rotary kinetic fluid motors or pumps

Pump having reversible runner rotation and separate outlets...

4151521, 415146, F04D 2950

Patent

active

059348720

ABSTRACT:
A washer pump, which adapted to selectively supply wash fluid to one of front and rear windows of an automobile, comprises a valve mechanism. The valve mechanism has two wash fluid conduction pipes communicating with two wash fluid feed pipes in a pump body, two wash fluid delivery pipes, two valve seats provided on respective ends of two wash fluid conduction pipes and facing each other, and a valve body arranged between two valve seats and capable of closing one wash fluid passage at one valve seat on a low pressure side while opening the other wash fluid passage at the other valve seat on a high pressure side. The valve body has two diaphragms including elastically-deforming portions respectively, whereby the center area of one of two elastically-deforming portions acts as one side seal portion engageable with one valve seat and the center area of the other of two elastically-deforming portions acts as the other side seal portion engageable the other valve seat. The opposite sides of the two side seal portions are connected to opposite ends, respectively, of a piston member movable in response to fluid pressure on the diaphragms.

REFERENCES:
patent: 4824332 (1989-04-01), Perkins et al.
patent: 4874298 (1989-10-01), Mainardi et al.
patent: 4900235 (1990-02-01), Perkins et al.
patent: 4919591 (1990-04-01), Kamimura et al.
patent: 5344293 (1994-09-01), Mota et al.

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