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:
Aug. 15, 2000
Filed:
Apr. 20, 1998
Dennis D Eberwein, Riverside, CA (US);
Wilden Pump & Engineering Co., Colton, CA (US);
Abstract
An actuator valve for an air driven reciprocating device including a housing with a cylinder having a sliding valve piston located therein. The valve piston includes circumferential grooves near the ends of the piston to receive floating piston rings. The piston rings exhibit a positive clearance with the cylinder which allows axial airflow thereby. The housing provides an inlet extending into one side of the cylinder and passageways diametrically opposed extending from the cylinder. Controlled passageways at the ends of the cylinder alternately vent. Between venting, the cylinder accumulates pressure at both ends of the piston. With venting, the pressurized air at the unvented end of the piston shifts the piston toward the vented end. Bleed passageways extend from adjacent the inlet to the ends of the piston to assist shifting once the piston proceeds over center.