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. 20, 2003
Filed:
Nov. 29, 2001
Hidefumi Inoue, Saitama-Ken, JP;
Yoshiyuki Hiratsuka, Saitama-Ken, JP;
Yasushi Mori, Saitama-Ken, JP;
Takasaki Yoshiyasu, Saitama-Ken, JP;
Bosch Braking Systems Co., Ltd., Tokyo, JP;
Abstract
A first vacuum valve seat is formed on a valve body , and a second vacuum valve seat is formed on a tubular member which is slidably mounted on the valve body . A lever member is provided between the tubular member and a valve plunger , and when the valve plunger strokes through a given stroke or more relative to the valve body , the lever member moves angularly to retract the tubular member rearward relative to the valve body . When a brake pedal is quickly depressed, the lever member moves angularly to cause an engaging tab to engage an engaging recess formed in the valve body , thus retaining the tubular member at a position which is reached as it is retracted rearward relative to the valve body . This allows an atmosphere valve to be opened to a greater opening than during a usual operation, allowing an increased output to be obtained rapidly. The present invention allows an output from a brake booster to be increased rapidly as an immediate response to a quick depression of the brake pedal.