Knorr-bremse Gmbh

Walter Furtner

Albert Kerscher

A spring-loaded braking cylinder has a rapid release mechanism which disengageably connects the spring-loaded piston with the piston rod. A damping mechanism damps the relative movement between the piston and the piston rod which occurs upon release of the coupling between the spring-loaded piston and the piston rod. The piston rod is coupled to the piston by a transverse pin a portion of which projects into a transverse slot on the piston rod and another portion of which is movable within an L-shaped slot on the piston rod. An adaptor connected to the pin has a flange which acts as a piston within a closed chamber formed with the piston rod and filled with fluid. The spaces on both sides of the piston-like flange are interconnected by throttle passages. The damping mechanism may also comprise a rotary pump structure in parallel with a clutch between the piston rod head and the actuating member where the releasable coupling is constructed as a threaded spindle and clutch nut threaded into each other by means of an non-self-locking thread of a linkage adjustment mechanism and a releasable coupling is provided between the piston rod head and an actuating member extending from the adjustment mechanism.

Rapid release mechanism for a spring-loaded brake cylinder

A brake cylinder has a piston one side of which is spring-loaded and the other side of which is acted upon by a fluid pressure medium. A spindle shaft is coupled t the cylinder by a screw coupling having a non-self-locking thread and is engageable with an actuating rod which is adapted to be connected to the brake linkage. A sleeve is rotatably mounted on the cylinder but is non-axially movable with respect to the cylinder. The sleeve is axially but non-rotatably slideable with respect to the spindle shaft. An overrunning drive is operatively connected between the sleeve and a drive mechanism which is operable exteriorly of the brake cylinder. The drive locks in the driving position when the sleeve rotates in a direction to unscrew the spindle shaft from the piston in the direction to release the brake.

Mechanical release mechanism for a spring-loaded brake cylinder

A hydraulic hand brake for a fluid pressure actuated brake on a railway vehicle has a cylinder and piston assembly extending coaxially from the brake cylinder. A threaded rod having a non-locking thread extends from the piston and has threaded thereon a traveling nut with a coupling surface on a side away from the brake piston engageable with a second coupling surface on a ring attached to the cylinder. A spring urges the nut in the direction to engage the coupling surfaces and a control piston engages the nut to disengage the coupling surfaces when the control piston is subjected to a hydraulic pressure. Subjecting the piston of the cylinder and piston assembly to a hydraulic pressure will cause the threaded rod to engage the brake piston and to move the brake piston in the braking direction.

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Rosenheim, Germany

Walter Furtner