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:
Mar. 16, 1993
Filed:
Jun. 13, 1991
Yuzuru Sugiura, Anjo, JP;
Satoshi Kawasumi, Takahama, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
A vacuum type brake booster includes a housing including a front shell and a rear shell in which a constant negative pressure chamber and a variable pressure chamber are defined by a power piston and a diaphragm, a partition for dividing the variable pressure chamber into a first variable chamber next to the constant negative pressure chamber and a second variable chamber, a normally opened valve mounted on the partition for establishing or interrupting of the fluid communication an output rod movable together with the power piston, an input rod for urging the output rod, a valve mechanism disposed with in the power piston to be operated by the input rod and used for controlling the differential pressure between the constant negative pressure chamber and the variable pressure chamber by controlling the fluid communication of the second variable chamber with the constant negative pressure chamber and the atmosphere and a normally closed valve mounted on a rear shell and the partition and disposed between the first variable chamber and the atmosphere.