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:
Jun. 01, 2004
Filed:
Nov. 26, 2002
Shigeru Murata, Tokyo, JP;
Yamada Corporation, Tokyo, JP;
Abstract
A diaphragm-type pumping apparatus ( ) includes a pair of diaphragms ( ), each defining a fluid delivering chamber ( ) and a working fluid chamber ( ), a main body section ( ) operatively supporting a center rod ( ) so as to allow a reciprocating motion thereof, and a pair of casing members ( ), arranged so as to hold the main body section from opposite sides thereof and functioning in association with the main body section ( ) to clamp the peripheral portions ( ), of the respective diaphragms ( ), from opposite sides along a thickness direction thereof. The diaphragm has an annular lip section ( ) extending in either side along a direction of the reciprocation motion of the center rod ( ) and also along the thickness direction of the diaphragm . An annular wall section ( ) for defining an annular recess ( ) is formed in the casing member ( ), and an annular threaded member ( ) is engaged with an outer surface of the annular wall section ( ) for compressing the annular lip section ( ) against the main body section ( ) and the casing member ( ).