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:
Oct. 02, 1990
Filed:
Nov. 02, 1988
Masaaki Chiba, Himeji, JP;
Hideki Maruhashi, Himeji, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A diaphragm device utilized, for example, in a vacuum advance mechanism of a distributor of an internal combustion engine is disclosed. The diaphragm device comprises: a housing consisting of two cup-shaped members coupled to each other at the marginal flanges thereof; a diaphragm extending in the housing to define an airtight chamber therein; and a control rod coupled to the diaphragm to transmit the motion thereof. The outer marginal portion of the diaphragm is clamped between the flanges of the two cup-shaped housing members, wherein the distance between the radially extending flanges clamping the diaphragm therebetween is strictly controlled by a distance regulator, which may be constituted by a step formed in the outer portion of one of the flanges toward the other flange, the outer marginal portion of the diaphragm being received in the stepped-down inner portion of the stepped flange. The diaphragm may have an annular bead formed at the outer marginal portion which is tightly received into a corresponding groove formed in the opposing flange. Further, the distance regulator may be consituted by an axially bent peripheral portion of one of the flanges. In the case of an annular diaphragm, the inner marginal portion thereof is sandwiched between two stiffening annular disks, and an inner edge of one of the disks is bent toward the opposing surface of the other disk to regulate the distance therebetween.