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:
Dec. 18, 1990
Filed:
Sep. 08, 1989
Kerry G Vonalt, Edgerton, OH (US);
The Aro Corporation, Bryan, OH (US);
Abstract
A chop-check pump for viscous material having cylinder means defining an axis, a drive rod axially movable within the cylinder means, a primer valve attached at one end of the drive rod and movable with the drive rod, and a floating check valve mechanism associated with the cylinder means at an outlet from the cylinder means through which the drive rod extends into the cylinder means. The primer valve includes a distal valve plate secured to the drive rod and a slidable valve plate on the drive rod slidable between a position against the distal valve plate and a position spaced from the distal valve plate. There are flow passages in both valve plates. Preferably, the flow passages in the slidable valve plate and the distal valve plate have a cross sectional area slightly less than the cross sectional area of the respective plates. In one embodiment, the slidable valve plate has a radial extent greater than that of the distal valve plate. The bottom of the distal valve plate is configured with a sharp leading edge for facilitating movement of the primer valve into the viscous material to be pumped.