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:
Oct. 24, 1989
Filed:
Jan. 23, 1989
Keith W Langley, Bath, GB;
Jack Washbourn, Axminster, GB;
Westinghouse Brake & Signal Holdings Ltd., Chipperham, GB;
Abstract
A tread-brake unit copmrises, as a unitary structure, a brake shoe (300) for engaging a vehicle wheel tread, a brake actuator (100) having an output member (19) via which the brake shoe (300) can, firstly, be moved into engagement with the wheel tread and, thereafter, a braking force generated by the actuator (100) can be transmitted to the brake shoe (300), and a slack adjuster (200) by which clearance between the brake shoe (300) and the wheel tread, in the 'released' condition of the unit, can be maintained substantially constant. The slack adjuster (200) has a pair of fast-threaded units (20,21), each nut being threadedly engaged with and rotatable on the output member (19) of the actuator (100). The actuator (100) includes a piston (4) of non-circular peripheral configuration that is within a cylinder (2) that has a complementary-shaped internal wall (6) whereby the piston (4) is non-rotatable with respect to but is slidable in the cylinder (2), a piston rod (8) rotationally fast with the piston (4) being of tubular form. The slack adjuster (200) includes securing means (22/24-25/26/27/28) for non-rotatably and releasably securing one of the nuts (20,21) to the tubular piston rod (8) thereby to prevent rotation of this nut (20) relative to the output member (19).