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:
Feb. 26, 1991
Filed:
Sep. 28, 1989
Applicant:
Inventors:
Thomas Hetzel, Sheboygan, WI (US);
Roy J Rozek, Plymouth, WI (US);
Assignee:
Thomas Industries Incorporated, Louisville, KY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
417571 ; 417562 ;
Abstract
A wear shield attached to a piston in a piston type compressor cushioning impact and reducing friction between the piston and a valve which opens in a direction toward the piston. During some conditions of operation, without the wear shield, a piston can impact the opening valve, which opens interior of a cylinder which holds the piston. The wear shield installed between the piston and the opening valve reduces wear on the piston and on the valve, and also reduces operating noise.