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, 1989
Filed:
Nov. 30, 1987
Applicant:
Inventor:
Kazumasa Yamada, Tokyo, JP;
Assignee:
Yamada Yuki Seizo Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
92 9 / ; 921692 ; 417393 ; 417395 ;
Abstract
A pressure chamber of a diaphragm pump having an outer chamber improved so that it is free from stress concentration. The inner wall surface of the pressure chamber is recessed in a mero-spherical shape. In order to support this chamber wall from its rear side, an outer ring rib is provided along the outermost periphery of the outer surface of the chamber, and an inner ring rib is circumferentially disposed at the inner side of the outer ring rib. Further, radial ribs are provided so as to connect together the outer and inner ring ribs in the radial direction.