Expansible chamber devices – Collapsible chamber wall portion – Wall portion formed of flexible material
Patent
1982-02-11
1985-07-02
Hershkovitz, Abraham
Expansible chamber devices
Collapsible chamber wall portion
Wall portion formed of flexible material
92168, 92169, F01B 1900, F15B 910
Patent
active
045260893
ABSTRACT:
A vacuum booster device which comprises a booster shell; a booster piston axially slidably accommodated in the booster shell and having a central boss portion and a disc portion around the outer circumference of the boss portion; and a diaphragm superposed on the rear surface of the disc portion and having an inner circumferential bead fitted to the central boss portion of the booster piston and an outer circumferential bead fitted to the circumferential wall of the booster shell. The booster piston and the diaphragm cooperate with each other to divide the interior of the booster shell into a front side first working chamber communicated with a vacuum supply source and a rear side second working chamber selectively communicated with the first working chamber or the atmosphere via a control valve operatively connected to an input member. The front and rear walls of the booster shell are connected to each other by tie rods extending through the disc portion of the booster piston and the diaphragm. Seal means are provided to through-holes of the disc portion through which the tie rods extend. The booster piston is divided into the central boss portion having a flange formed around its other circumference and the disc portion placed in contact with the rear surface of the flange, and a retainer member for clamping the disc portion and the inner circumferential bead of the diaphragm in cooperation with the flange is fixed to the outer circumference of the central boss portion.
REFERENCES:
patent: 3543298 (1970-11-01), Rockwell
patent: 3688647 (1972-09-01), Kytta
patent: 4245845 (1981-01-01), Ando
patent: 4325218 (1982-04-01), Weiler
patent: 4328738 (1982-05-01), Hamamatsu
patent: 4334459 (1982-06-01), Riedel
patent: 4398449 (1983-08-01), Takayama
patent: 4399735 (1983-08-01), Katagiri
patent: 4418611 (1983-12-01), Tateoka
patent: 4428274 (1984-01-01), Takeuchi et al.
Hershkovitz Abraham
Nissin Kogyo Kabushiki Kaisha
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