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:
Dec. 28, 1976
Filed:
Oct. 31, 1975
Gary B Schumacher, Navarre, OH (US);
Aspro, Incorporated, Canton, OH (US);
Abstract
A self-adjusting brake having a pair of brake shoes movably mounted and arranged in end-to-end relationship on a fixed backing plate. A pair of levers is pivotally mounted on the backing plate. The levers are interposed between a pair of opposed brake shoes and a hydraulic actuator for moving the brake shoes into engagement with the brake drum. A brake gap adjuster extends between and separates the other opposed ends of the brake shoes. The adjuster includes a rod having a threaded end engaged within a threaded bore of a first hollow sleeve, and a smooth end rotatably mounted within a smooth bore of a second hollow sleeve. A driving washer having camming surfaces is spring biased into meshed engagement with complementary camming surfaces of a driven washer which is fixedly mounted on the adjuster rod. The driving washer is rotatably mounted on the adjuster rod and is operatively connected to one of the brake levers through a bellcrank lever and rigid connecting rod. Operation of the hydraulic actuator moves the brake shoes outwardly, which pivots the brake levers inwardly, which in turn, rotates the meshed washers through the bellcrank lever and connecting rod to threadably advance the adjuster rod out of the first sleeve, which increases the spacing between the brake shoes, thereby regulating the brake gap upon wearing of the brake lining.