Power-servo booster

Details Power-servo booster Power-servo booster

Filed on

1984-04-13

Date issued

1986-05-13

Examiner

Hershkovitz, Abraham

Patent Class

Expansible chamber devices

SubClass

Collapsible chamber wall portion

SubSubClass

Wall portion formed of flexible material

Other Related Categories

92 99, F01B 1900

Type

Patent

Status

active

Patent number

045878897

Description

ABSTRACT:
A power servo booster having front and rear shells coupled together to reciprocally provide a power piston therein. A flexible diaphragm has an inner peripheral surface secured to the power piston and an outer peripheral surface secured to the coupling portion between the front and rear shells. The diaphragm divides the shell into negative pressure chamber and an atmospheric pressure chamber. A portion of the diaphragm confronts the rear face of the power piston and extends therefrom toward the front shell and then is folded back to provide a folded portion defined from outer end portion of the power piston. The folded portion is continuous to a contacting portion of the diaphragm which contacts inner wall of the shell. At least one of the contacting portion and the portion contacting the outer end of the power piston provides a thick wall portion as an high rigidity member.

REFERENCES:
patent: 2904068 (1959-09-01), St. Clair
patent: 3081063 (1963-03-01), Seltsam
patent: 3405609 (1968-10-01), Lee
patent: 3754450 (1973-08-01), Putt
patent: 3777777 (1973-12-01), Katchka
patent: 3824903 (1974-07-01), Hahn
patent: 3847513 (1974-11-01), Foster
patent: 3851565 (1974-12-01), Camm
patent: 3911796 (1975-10-01), Hull
patent: 3974849 (1976-08-01), Dawson
patent: 4296680 (1981-10-01), Ohta
patent: 4325218 (1982-04-01), Weiler

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