Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yoji Inoue0
Masaki Nakagawa0
Date of Patent
November 11, 2008
0Patent Application Number
116371610
Date Filed
December 12, 2006
0Patent Primary Examiner
Patent abstract
A valve piston 8 of a vacuum type booster device is provided with a bypass passage 51 which is defined between a sound-absorbing member 27 and an input rod 23 to communicate directly with the atmosphere and a sliding-type plate valve 52 composed of three plate valve parts 53, 54 55 which are arranged around the input rod 23 to be relatively slidable in radial directions. When the input rod 23 is advanced beyond a predetermined distance relative to the valve piston 8, the sliding-type plate valve 52 is separated between two of the plate valve parts 53, 54, 55 to make the bypass passage 51 communicate with the inside of the valve piston 8.
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