Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1983-05-13
1985-09-03
Richter, Sheldon J.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91369A, 91422, 91437, 92169, F15B 910
Patent
active
045385033
ABSTRACT:
A vacuum booster device which is mainly used to operate a master cylinder for hydraulic brakes or the like of automobiles. The device is so constructed that the inner peripheral bead of the diaphragm disposed within the booster shell and the clamping band adapted to clamp the bead tightly are fitted in the annular fitting groove formed in the rear surface of the booster piston, a part of the inner peripheral bead is formed as a thin-walled elastic valve portion which is in close-contact with the inner surface of the annular fitting groove in a separable manner and which engages with the notched recess formed in the rear side wall of the fitting groove, and the relief is provided between the valve portion and the clamping band to allow deformation of the elastic valve portion. Thus, when the pressure within the first working chamber is increased, air can be discharged from the first working chamber to the second working chamber through a gap made in the relief region due to deformation of the valve portion. This avoids an excessive rise in pressure within the first working chamber.
REFERENCES:
patent: 3921501 (1975-11-01), Rosback
patent: 4286501 (1981-09-01), Thomas et al.
patent: 4292887 (1981-10-01), Ohta et al.
Nissin Kogyo Kabushiki Kaisha
Richter Sheldon J.
Smith Randolph A.
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