Pumps – Motor driven – Fluid motor
Patent
1997-12-09
1999-03-02
Thorpe, Timothy S.
Pumps
Motor driven
Fluid motor
417399, 417489, 417269, 417 53, 92 136, 605471, F04B 1700
Patent
active
058761896
ABSTRACT:
A metering device for the precision feeding of a liquid, such as, for example, an oil lubricant. The device has a fluid supply chamber with a working medium such as oil and which in turn is in open communication with a metering chamber also containing the medium fluid. A fluid pumping piston passes through the supply chamber and then into the metering chamber. Upon entering the metering chamber, the pumping piston passes through an annular flexible seal of generally U-shaped cross section that has a pair of axially extending lips which act, respectively, along the piston and the metering chamber to thereby form a one-way valve therebetween. The piston forces the fluid out of the metering chamber and the volume displaced by the piston can be adjusted by adjusting the axial position of the metering chamber and thereby vary the extent to which the pumping piston enters the metering chamber.
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patent: 3747478 (1973-07-01), Dunn et al.
patent: 3884125 (1975-05-01), Massie
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patent: 4784578 (1988-11-01), Gruett
patent: 4784584 (1988-11-01), Gruett
patent: 5364111 (1994-11-01), Wunsch
Berrend Richard E.
Lukas Gus J.
Lube Devices, Inc.
Ratcliffe Paul L.
Thorpe Timothy S.
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