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, 2002
Filed:
Aug. 25, 2000
Ronald S. Plantan, Charlotte, NC (US);
Thomas O. Schultz, Davidson, NC (US);
Christopher J. Prager, Concorde, NC (US);
Michael M. Holm, Charlotte, NC (US);
Gary R. Sprague, Rock Hill, SC (US);
Indian Head Industries, Inc., Charlotte, NC (US);
Abstract
An improved diaphragm-type pneumatic brake actuator wherein the diaphragm is releasably secured to the piston as the diaphragm is inverted during actuation of the braking system of a vehicle thereby reducing wear of the flexible diaphragm and improving the performance of the brake actuator. In the disclosed embodiment, a rib or lip is formed on the surface of the diaphragm which receives the periphery of the piston as the diaphragm is inverted forming a mechanical interlock between the diaphragm and the piston thereby preventing spacing of the contact surface of the piston and the central portion of the diaphragm and frictional wear between the peripheral edge of the piston and the diaphragm. In the preferred embodiment, the piston includes an arcuate rim which extends away from the central portion of the diaphragm when the diaphragm is located in its extended cup-shaped position prior to actuation of the vehicle braking system and the diaphragm then conforms to the arcuate rim as the diaphragm is inverted and the diaphragm rib snaps over the piston rim as the diaphragm is inverted to actuate the vehicle braking system. The diaphragm rib may be molded on the surface of the diaphragm when the diaphragm is molded without any substantial increase in cost.