Adjustable return spring for a push rod

Details Adjustable return spring for a push rod Adjustable return spring for a push rod

1988-03-14

1990-04-17

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91376R, 91372, 91386, F15B 912

Patent

active

049170007

ABSTRACT:
A vacuum brake booster (12) having an input force applied to a brake pedal (20) for moving a plunger (28) to operate a control valve (24). A sleeve (98) concentric to the push rod (22) is located between the brake pedal (20) and plunger (28). A spring (94) acts on the sleeve (98) to move the plunger (28) against a stop (76) in the absence of an input force. A ramp (104) on sleeve (98) cooperates with projection (102) on said push rod (22) to define a linear dimension for the spring (94). Rotation of the sleeve (98) changes the load of the spring (94) and correspondingly the force required to initiate the operation of the control valve (24) through movement of the plunger (28).

REFERENCES:
patent: 2799140 (1957-07-01), Osborne
patent: 3364818 (1968-01-01), Hager et al.
patent: 3572219 (1971-03-01), Murrell et al.
patent: 3613520 (1971-10-01), Worden
patent: 3618321 (1971-11-01), Moran
patent: 4784038 (1988-11-01), Guatier

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