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:
Mar. 07, 1989
Filed:
Jul. 05, 1985
Keith H Fulmer, Mishawaka, IN (US);
Allied-Signal Inc., Morristown, NJ (US);
Abstract
Disc brake assembly (10) includes a phenolic piston (16) disposed within a bore (14) of a housing (11), the piston (16) movable relative to the housing (11) in order to engage brake shoe pads (18, 20) with the disc (22) of the brake assembly. An interior seal ring (42) and an exterior boot seal (60) are disposed between the bore (14) and piston (16) in order to prevent contaminants from entering into the bore and damaging the phenolic piston. Located between an annular groove (40) receiving the interior seal ring (42) and an exterior opening (50) receiving one end of the exterior boot seal (60), is a land (70). The land (70) is protected by a corrosion resistant barrier (80) which protects the land from oxidation and subsequent lock-up of the phenolic piston (16), and provides a low friction surface for engagement with the slidable piston.