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. 18, 1989
Filed:
Jan. 27, 1987
Rozo Ariizumi, Urawa, JP;
Masakuni Kainuma, Ohmiya, JP;
Fujikura Rubber Ltd, Tokyo, JP;
Abstract
An air pilot operated directional control valve for selectively connecting a normally open port to two selection ports, by an axial movement of a plunger with valve seats which are adapted to selectively close the axial open ends of the selection ports. The valve has diaphragms which define therebetween a control chamber in which the selection ports and the normally open port open. The plunger is continuously biased by a spring in one direction. The valve also has a pilot pressure chamber which is defined by one of the diaphragms, so that when the pilot pressure exceeds a predetermined value, the plunger moves in the axial direction against the spring to switch the connection between the normally open port and the selection ports.