B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/66
B60T 13/58 (2006.01) B61H 1/00 (2006.01) F16D 65/72 (2006.01) F16D 65/74 (2006.01) F16D 65/20 (2006.01)
Patent
CA 1322567
(Case No. 8460) ABSTRACT OF THE DISCLOSURE A hydraulic power unit for a hydropneumatic brake actuator having a power piston comprising a force piston formed with a bore therein and a take-up piston operative in the force piston bore for movement relative thereto during a brake application. This relative movement is controlled by a check valve device carried with the force piston to establish or interrupt fluid pressure communication between the respective pistons and establishes a positive clearance between a brake shoe and wheel tread, for example, during a subsequent brake release.
589846
Fourie Eugene
Rumsey Steven C.
Fetherstonhaugh & Co.
Westinghouse Air Brake Company
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