B - Operations – Transporting – 61 – H
Patent
B - Operations, Transporting
61
H
188/57
B61H 13/02 (2006.01) B61H 13/04 (2006.01)
Patent
CA 1138786
ABSTRACT OF THE DISCLOSURE A hand brake mechanism of the quick-release type having locking structure preventing accidental brake release includes a clutch collar interconnecting a drive member mounted on a shaft for rotation therewith and a pinion mounted on the shaft for rotation relative thereto and for being operatively connected in a power train to the car brakes. The collar is shiftable on the shaft between a drive position making the aforesaid inter- connection, and a brake-release position wherein the connection is broken and the pinion is freely rotatable on the shaft. A pivotally mounted shift lever has collar-engaging members for shifting the collar between such positions. A cam shaft is provided with a cam which, when the cam shaft is rotated in one direction, engages the shift lever to shift the collar into the brake-release position. The cam shaft also is provided with a reaction member having a cam surface which, when the cam shaft is rotated in the opposite direction, engages the shift lever to shift the collar into the drive position, and having a stop surface which engages the shift lever when the collar is in the drive position, to positively and mechanically lock the collar in the drive position. A second reaction member is provided on the cam shaft, in a preferred structure, such member engaging the collar when it is in the drive position, also to positively and mechanically lock the collar in its drive position. Any forces which may be experienced, tending to shift the collar out of its drive position when locked therein by the reaction members, act on the reaction members in opposite directions, so that the forces are assimilated by the cam shaft. -2-
359765
Klasing Industries Inc.
Ridout & Maybee Llp
LandOfFree
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