F - Mech Eng,Light,Heat,Weapons – 16 – D
Patent
F - Mech Eng,Light,Heat,Weapons
16
D
188/178
F16D 65/56 (2006.01) B61H 1/00 (2006.01)
Patent
CA 1315211
-17- ABSTRACT A tread-brake unit comprises, 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 nuts (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).
589448
Langley Keith William
Washbourn Jack
Gowling Lafleur Henderson Llp
Westinghouse Brake And Signal Holdings Limited
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