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:
Feb. 11, 1997
Filed:
May. 25, 1995
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
The present invention is directed to a vacuum servo unit, wherein a variable pressure chamber is capable of communicating with the atmosphere through a clearance which is defined between an air valve member slidably mounted on an input member and a seal member provided in a cylindrical member, and wherein the variable pressure chamber is capable of communicating with a constant pressure chamber through a clearance which is defined between a vacuum valve member and a seal portion of a control valve member. Accordingly, when the air is introduced from the clearance between the air valve member and the seal member in the condition where the seal portion of the control valve member is in contact with the vacuum valve member, the control valve member is biased toward the vacuum valve member by the pressure difference between the negative pressure and the atmospheric pressure.