Vacuum brake booster

Details Vacuum brake booster Vacuum brake booster

1979-04-09

1980-11-18

McCarthy, Edward J.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

60554, F15B 910, B60T 1320

Patent

active

042338840

ABSTRACT:
In prior art vacuum brake boosters embodying a two-stage reaction, the magnitude of the two-stage reaction is limited because of the small space available for the reaction-delaying spring. Moreover, the lost motion present in the reaction lever mechanism has to be overcome when the braking operation is initiated. These disadvantages are overcome in a vacuum brake booster including a reaction mechanism constructed in accordance with the present invention wherein the reaction-delaying spring is positioned on the side of the reaction levers adjacent the vacuum chamber and by having the point of contact of the spring on the reaction levers at a greater radius than the point at which the levers are in engagement with the movable wall.

REFERENCES:
patent: 2826041 (1958-03-01), Rike
patent: 3470697 (1969-10-01), Pech
patent: 3499288 (1970-03-01), Randol
patent: 4107926 (1978-08-01), Adachi

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