Pneumatically operated servo-booster

Details Pneumatically operated servo-booster Pneumatically operated servo-booster

1987-02-04

1989-01-03

Garrett, Robert E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

913693, F15B 910

Patent

active

047948442

ABSTRACT:
A pneumatically operated servo-booster has a housing divided by a movable diaphragm assembly into chambers (A, B), and a hub connected to the diaphragm and forming a vacuum valve seat for co-operation with a spring-loaded valve member. A valve element movable relative to the hub forms an atmospheric valve seat for co-operation with the valve member. A sleeve co-axial with but separate from the hub carries an abutment member which forms a fixed abutment for the valve seat when the sleeve is in abutment with the shoulder of the housing. When the seat abuts the member, co-operation of the vacuum valve seat with the valve member under the action of pressure in one of the chambers maintains the atmospheric valve in a position of readiness for activation of the booster. This arrangement contributes to increased sensitivity of operation.

REFERENCES:
patent: 4286501 (1981-09-01), Thomas et al.
patent: 4409790 (1983-10-01), Seip
patent: 4417500 (1983-11-01), Hayashida
patent: 4633760 (1987-01-01), Wagner
patent: 4643075 (1987-02-01), Wagner
patent: 4665800 (1987-05-01), Rossigno et al.

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