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:
Nov. 08, 1988
Filed:
May. 26, 1987
Wilfried T Giering, Mendig, DE;
Sigmar H Micke, Koblenz-Metternich, DE;
Franz-Helmut Holl, Mastershausen, DE;
Jorg Thielecke, Hillscheid, DE;
Lucas Industries public limited company, Birmingham, GB;
Abstract
At least one brake shoe (14) comprising a lining support member (16) and two lining sections (20) fastened one behind the other in circumferential direction to the support member (16) is arranged in a brake drum (10) which has a circular cylindrical internal braking surface (12). Each lining section (20) has an at least approximately circular cylindrical friction surface (22) the radius of curvature (R22) of which is smaller than the radius of curvature (R12) of the braking surface (12) and the center of curvature (M22) of which is located such that only a center portion of the friction surface (22) engages the braking surface (12) upon actuation of the brake. In a rectangular coordinate system (X,Y) the origin of which lies on the axis (A) of the brake drum (10) and the abscissa (X) of which is formed by a center line between the two lining sections (20), the center of curvature (M22) of each friction surface (22) has a distance (y 22) from the abscissa which is smaller than the distance (x22) from the ordinate upon actuation of the brake. This shortens the running-in period during which the friction surfaces (22) becomes adapted to the braking surface (12) of the brake drum (10).