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:
Sep. 20, 2022
Filed:
May. 23, 2019
Yamada Corporation, Tokyo, JP;
Kotaro Yamada, Sagamihara, JP;
Satoru Suwabe, Sagamihara, JP;
YAMADA CORPORATION, Tokyo, JP;
Abstract
To manufacture a diaphragm pump with higher reliability in which the mechanism of a main valve is simplified without a pilot chamber. A diaphragm pumpincludes paired diaphragmsandthat define pump chambersand air chambers, a main body unitthat slidably supports a center rodat a central portion of each diaphragmso as to be capable of reciprocating the center rod, and a valve bodythat houses a spoolthat switches supply of a fluid to the air chambersandso as to reciprocate the center rod, the valve bodyincluding a sleeve, and the spoolthat is disposed inside the sleeveto be reciprocated in an axial direction, wherein the spoolis composed of a disc-shaped portion S, a disc-shaped portion S, and a disc-shaped portion S, and a surface area of each disc-shaped portion that receives a compressed air pressure has a relationship that an upper side of the disc-shaped portion S>a lower side of the disc-shaped portion S>an upper side of the disc-shaped portion S