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:
Jul. 06, 2004
Filed:
Jun. 20, 2002
Michael H. McNaull, Ashland, OH (US);
Mason B. Mount, Mansfield, OH (US);
The Gorman-Rupp Company, Mansfield, OH (US);
Abstract
A pump ( ) has a housing which forms a pump chamber ( ) having a wall ( ). Inlet and outlet valve assemblies ( ) communicate with the chamber ( ) and, respectively, allow fluid to be received in, and discharged from, the chamber ( ). An armature ( ) carries a plunger ( ) and is reciprocatably moved by an electromagnetic coil assembly ( ). A coil spring ( ) biases the plunger ( ) toward a stop surface ( ) positioned adjacent to the plunger ( ). Upon activation of the coil assembly ( ), the plunger. ( ) is moved against the force of the spring ( ) such that a diaphragm ( ) carried by the plunger ( ) moves into the chamber ( ) without engaging the wall ( ) to discharge fluid through the outlet valve assembly ( ). When the coil assembly ( ) is deactivated, the spring ( ) moves the plunger ( ) toward the stop surface ( ) without allowing it to engage the stop surface ( ) to draw fluid in through the inlet valve assembly ( ). In another embodiment, a second coil spring ( ) is positioned so as to bias the plunger ( ) away from the stop surface ( ) to prevent the plunger ( ) from engaging the stop surface ( ) during priming of the pump ( ).