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:
Sep. 21, 1993
Filed:
May. 21, 1992
Alvin J Matthews, Pittsburgh, PA (US);
Thomas M Hartzell, Wilmerding, PA (US);
Ronald M Markos, McKeesport, PA (US);
Richard H Gumbert, North Huntington, PA (US);
Westinghouse Air Brake Company, Wilmerding, PA (US);
Abstract
A valve bushing cleaning device for cleaning a valve bushing while the bushing is situated in a valve bore of a valve body, such as in a railway vehicle brake apparatus and a method for cleaning such valve bushing. The cleaning device comprises a hollow cylindrical conduit having a first open end attachable to a source of pressurized fluid and a second closed end. The conduit has a recessed portion with fluid passageways through the wall thereof and structure for securing a sealing member on each side of the fluid passageways. In the method, the closed end of the cleaning device is inserted into a valve bushing disposed in a valve bore of a valve body, with pressurized fluid forced through the conduit, out of the fluid passageways, and through apertures in the valve bushing, with any solids picked up and carried by the fluid through passages formed in the valve body.