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:
Apr. 04, 1995
Filed:
Oct. 07, 1993
Toyoda Gosei Co., Ltd., Nishikasugai, JP;
Abstract
In a first valve mechanism 30, a positive pressure spring 31 presses a first valve plug 34 to seat an external ring projection 37 of the first valve plug 34 onto a bottom surface 39 of a support cylinder 35. The first valve mechanism 30 opens at a first valve-opening pressure P1 responsive to a pressure balance across the positive pressure regulating valve plug 34. In a safety valve mechanism 60, the same spring (the positive pressure spring 31) presses a safety valve plug 61 via the external ring projection 37 seated on the bottom surface 39 to seat a sealing ring projection 62 of the safety valve plug 61 onto an upper face 63 of a partition wall 28. The safety valve mechanism 60 opens at a second valve-opening pressure P2 responsive to a pressure balance across the safety valve plug 61. A pressure receiving area S1 of the positive pressure regulating valve plug 34 and a pressure receiving area S2 of the safety valve plug 61 are determined to open the positive pressure regulating valve mechanism 30 but maintain the safety valve mechanism 60 in its closing state when an internal pressure of a fuel tank reaches the first valve-opening pressure P1.