The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 1983
Filed:
Sep. 26, 1980
Yoshihisa Miyazaki, Ueda, JP;
Nissin Kogyo Kabushiki Kaisha, Ueda, JP;
Abstract
A vacuum actuated type booster device for assisting master cylinder of automobile braking system. The device has a booster shell, a booster piston reciprocatably received by the booster shell, a diaphragm connected at the inner peripheral portion thereof to the rear side of a disc portion of the booster piston and at the outer peripheral portion thereof to the peripheral wall of the booster shell, a first and a second working chambers defined in the booster shell by the booster piston and diaphragm, a vacuum source with which the first and the second working chambers are normally communicated and an input rod slidably mounted in the booster piston. The second working chamber solely is brought into communication with the atmosphere as the input rod is moved forwardly so that the booster piston is driven forwardly by the pressure differential between the first and the second working chambers. The booster piston is constituted by a piston body with windows formed in the disc portion thereof and a porous thin-walled member covering the windows. The diaphragm contacts the porous thin-walled member to close the windows.