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:
May. 09, 2006
Filed:
Dec. 24, 2002
Satoru Watanabe, Higashimatsuyama, JP;
Hidefumi Inoue, Higashimatsuyama, JP;
Satoru Watanabe, Higashimatsuyama, JP;
Hidefumi Inoue, Higashimatsuyama, JP;
Bosch Automotive Systems Corporation, Tokyo, JP;
Abstract
In a negative pressure boosting device of the present invention, upon depression of a pedal at a normal speed, an input shaftand a valve plungermove forward to close a vacuum valveand open an atmospheric valveand a power pistona valve bodyand an output shaftmove forward. In the initial stage of operation, hooksandare not engaged with each other so that a cylindrical memberdoes not move forward, thereby shortening the stroke of the input shaftas compared to a conventional one. Upon rapid depression of the pedal, a press facepresses a pressed faceso as to deform an engaging arm portion, thereby disengaging the hooksandfrom each other. The cylindrical memberis moved backward by a springto push a vacuum valve portionso that the atmospheric valve portionis spaced apart from the atmospheric valve seatmore rapidly than that of the service braking, thereby increasing the jumping amount and thus rapidly intensifying the output.