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:
Jan. 22, 1985
Filed:
Nov. 23, 1983
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
A tandem-type brake booster including a closed shell assembly composed of front and rear chambers defined by a partition member therein and power pistons coaxially disposed in the front and rear chambers, respectively, the power pistons being operatively coupled with each other and passing through a substantially central portion of the partition member, each of the front and rear chambers being divided into a constant-pressure chamber subjected to a vacuum and a variable-pressure chamber communicable selectively with the constant-pressure chamber and atmosphere, the constant-pressure chambers in the front and rear chambers being held in communication with each other, the variable-pressure chambers in the front and rear chambers being held in communication with each other, the power pistons being axially movable in unison by pressure differences between the constant-pressure chambers and the variable-pressure chambers, respectively, one of the front and rear chambers having an outside diameter smaller than that of the other chamber and that of the power piston disposed in the other chamber, and the power piston in the other chamber having an outer peripheral portion overlapping an outer peripheral portion of the one chamber when the power pistons are moved forward.