B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/41
B60T 13/22 (2006.01) B60T 17/08 (2006.01) F01B 9/00 (2006.01)
Patent
CA 1260515
ABSTRACT OF THE DISCLOSURE An automatic reset arrangement for a manual release mechanism in a spring applied, air-released brake com- prising a sleeve member having axially projecting fingers that slide axially within the bore of the spring piston push rod. The ends of the projecting fingers are formed with outturned lugs having a conically-shaped surface adapted to engage a correspondingly-shaped shoulder in the bore of the piston push rod to provide a drive connection through which the spring brake force is transmitted to the sleeve member. A cylindrical plug member is normally arranged within the sleeve member at the flange end thereof to prevent inward deflection of the fingers and to thus maintain the integrity of the drive connection. A spring-returned, manually operable release lever is arranged to withdraw the plug member when it is desired to release the spring brake in the absence of air. Withdrawing the plug member allows the axial spring force acting through the conical drive surfaces to deflect the fingers radially in- wardly to release the drive connection and accordingly permit the spring force to be dissipated. When air pressure is restored, the return spring of the manual release lever acting via the plug member forces the fingers radially outwardly to restore the drive connection.
496895
Fetherstonhaugh & Co.
Wabco Ltd.
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