Hydraulic pump

Details Hydraulic pump Hydraulic pump

1997-12-18

1999-11-30

Denion, Thomas E.

Expansible chamber devices

Collapsible chamber wall portion

Wall portion formed of flexible material

92 89, F01B 1900

Patent

active

059922966

ABSTRACT:
In a hydraulic pump, an elastic sealing member for performing sealing between a cylinder and a slide piston reciprocating in the cylinder is provided in the front end side of the slide piston and along the inner circumferential surface of the cylinder so that the elastic sealing member receives a compression force from a front end surface of the slide piston in a compression stroke of the slide piston and swells into a pump chamber because of elastic deformation due to the compression force to thereby reduce the volume of the pump chamber. Accordingly, the elastic deformation of the elastic sealing member in the compression stroke is used to increase the discharge quantity.

REFERENCES:
patent: 862867 (1907-08-01), Eggleston
patent: 2515100 (1950-07-01), Bornstein
patent: 3270684 (1966-09-01), Pasquali et al.
patent: 3945770 (1976-03-01), Welker
patent: 4666378 (1987-05-01), Ogawa
patent: 5052276 (1991-10-01), Halsey

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