Title: Servo booster

Abstract: A servo booster including a piston plate for receiving a differential pressure produced across two chambers which are defined in a shell casing, a cylindrical valve body having a valve mechanism therein for controlling the pressure across the two chambers, an aperture and a head portion formed respectively at the center portion of the piston plate and at an end portion of the valve body and being engageable with each other at a predetermined angular position, and the relative movement of the valve body and the piston plate in the direction of the axis of the servo booster being prevented by rotating the head portion through a predetermined angle in the aperture, wherein the improvement comprises a rotation preventing member rigidly mounted on the piston plate and having one portion thereof in fitting engagement with the valve body to prevent the relative rotation of the valve body and the piston plate.

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Inventors: Hayashida, Yoshihiro (Chigasaki, JP)
Tateoka, Kiyoshi (Fujisawa, JP)
Ando, Hiromi (Tokyo, JP)

Application Number: 06/003774
Filing Date: 1979-01-15
Publication_date: 1981-08-18
Assignee: TOKICO LTD

Primary Class(es): 91/376R 92/98D, 91/369.400
Other Classes: B60T13/569; B60T13/57; B60T13/52; F16J3/02; F15B9/10; F01B19/00
US Patent Ref:

2559478	July, 1951	Stone	92/30	Hydraulic impact tool
3754450	August, 1973	Putt et al.	913/69A	INTERCHANGEABLE BACKING PLATE FOR MOVABLE WALL OF A SERVOMOTOR
3981227	September, 1976	Azuma	913/69A	Power piston of booster
4005639	February, 1977	Welsh, Jr.	913/69A	Backing plate means for a servomotor

Other Refs:
Primary Examiner: Maslousky, Paul E.
Assistant Examiner:
Attorney: Wenderoth, Lind & Ponack

Claims: