Spring applied parking brake actuator having a collet style slac

Details Spring applied parking brake actuator having a collet style slac Spring applied parking brake actuator having a collet style slac

1997-05-02

1999-08-17

Schwartz, Chris

Brakes

Position adjusters

Slack

188196V, 188153R, 188170, 92130A, F16D 6556

Patent

active

059379740

ABSTRACT:
A brake actuator for use on passenger transit railway vehicles, is disclosed. The actuator includes a housing containing a service piston and a parking brake piston. The service piston is connected to an inner hollow stem having a forward conical surface disposed to engage a conical surface of a collet provided on a threaded rod located within the stem. The parking brake piston has a hollow outer sleeve surrounding the hollow stem, while a coil spring is located about the outer sleeve for applying a braking force when fluid pressure is removed from a housing containing the parking brake piston. The spring expands against a locking ring located on a forward sleeve secured to an intermediate sleeve that engages the hollow stem. This causes forward movement of the outer sleeve and forward movement of the conical portion of the hollow stem into engagement with the conical portion of the conical surface of the collet. This, in turn, moves the threaded rod to engage brake applying components of a transit vehicle.

REFERENCES:
patent: 4361078 (1982-11-01), Cape et al.
patent: 4364305 (1982-12-01), Dalibout et al.
patent: 4478319 (1984-10-01), Casalone et al.
patent: 4493246 (1985-01-01), Dalibout
patent: 4649804 (1987-03-01), Oberlander
patent: 4796513 (1989-01-01), Hata et al.
patent: 5423401 (1995-06-01), Noah et al.

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