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:
May. 04, 2004
Filed:
May. 22, 2003
James E. Doolittle, Granger, IN (US);
William E. Sherman, II, South Bend, IN (US);
Robert Bosch Corporation, Broadview, IL (US);
Abstract
A drum brake having a disc with a peripheral surface with a plurality of radial guides interspersed between a first radial abutment and a second radial abutment. The plurality of radial guides receive a first arcuate channel member on a first brake shoe and a second arcuate channel member on a second brake to align a first reaction surface on the first channel with the first radial abutment and a second reaction surface with the second radial abutment. An actuator provides a force to move the first reaction surface moves away from the first radial abutment and the second reaction surface from the second radial abutment to initiate a brake application. When a leading edge on a first friction member frictionally contacts a braking surface on a drum the first reaction surface continues to move away from the first radial abutment while second reaction surface associated with a trailing edge is moved back into engagement with the second radial abutment to oppose the braking force developed by the frictional engagement. During the frictional engagement, the plurality of radial guides engage the first and second arcuate channels to retain the first and second friction surfaces in perpendicular alignment with the braking surface.