BOOSTER

WIPO Patent Application WO/2003/002876

A1

A booster allowing a pump to be reduced in size, eliminating the need of a selector valve, and emitting less noise, comprising two booster units (5, 5') and pressure pumps (11, 11') for feeding low pressure side fluid (A) to the booster units, the booster units further comprising a low pressure side cylinder (53) and a high pressure side cylinder (54), wherein the low pressure cylinder is divided into a primary side space (53a) and a secondary side space (53b) by a low pressure side piston (55a), the low pressure side piston is formed integrally with a high pressure side piston (55b), the pressure pump (11) is allowed to rotate in forward and reverse directions and connected to the primary side space of the low pressure side cylinder, and the secondary spaces of the low pressure side cylinders are connected to a pressurizer (13), whereby, when the pressure pump (11) is rotated in forward direction, the fluid (A) is fed to the primary side space (53a) to pressurize fluid (B) in the high pressure side cylinder (54) and, when the pressure pump (11) is reversely rotated, gas is fed from the pressurizer (13) to the secondary side space (53b) to raise the piston (55) so as to suck the fluid (B) into the high pressure side cylinder (54).

KARASAWA YUKIHIKO (JP)

PCT/JP2002/006281

January 09, 2003

June 24, 2002

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KARASAWA FINE LTD (JP)
KARASAWA YUKIHIKO (JP)

F04B9/105; F04B9/107; F04B9/117; F15B3/00; (IPC1-7): F15B3/00

JPH0727103A	1995-01-27
JPS61122402U	1986-08-01
JPH03128882A	1991-05-31
US5894830A	1999-04-20

Nakakura, Kazuhiko (Nihonbashi Yokoyama-cho Chuoh-ku, Tokyo, JP)

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