Pneumatic brake booster comprising improved sealing means

Details Pneumatic brake booster comprising improved sealing means Pneumatic brake booster comprising improved sealing means

2005-08-16

2005-08-16

Lazo, Thomas E. (Department: 3745)

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

C092S09800R

Reexamination Certificate

active

06928918

ABSTRACT:
A pneumatic brake booster comprising an envelope of longitudinal axis formed of a dish having a rim and a lid. The envelope defines an interior volume that is divided into a variable-pressure work chamber and a low-pressure chamber by a skirt. The skirt is mounted to sealingly slide along the longitudinal axis of the envelope. The skirt has a central orifice with a pneumatic piston sealingly mounted therein. The sealing between the variable-pressure work chamber and the low-pressure chamber is achieved by a first sealing member arranged between a radially internal first end of the skid and a radially external end of the piston and a second sealing member arranged at a radially external second end of the skid and an internal surface of the rim. The skid provides sealing between the radially external first end of the skirt and the radially internal second end of the skirt.

REFERENCES:
patent: 3037487 (1962-06-01), Brooks
patent: 4270353 (1981-06-01), Thomas et al.
patent: 4423665 (1984-01-01), Haar
patent: 4495854 (1985-01-01), Hibino

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