| 摘要 |
A device for discontinuing and automatically restoring the operational function of a spring brake actuator. The device includes a piston with a piston rod and a spring for actuating the piston and piston rod in a working direction for brake application at falling brake fluid pressure on the piston. A slitted, resilient locking ring is arranged in grooves facing each other in the piston rod and a piston rod sleeve coaxial therewith. The locking ring can either be constrained to rest in both of the grooves, so that the piston rod and piston rod sleeve are locked together, or be free to be forced completely into one of the grooves, which is at least as deep as the thickness of the ring, so that the piston rod and piston rod sleeve are free to move independently of each other. In a compartment in a piston rod flange are arranged a movable locking yoke, which can engage heads at the respective ends of the ring for keeping them together, and a locking cube, which is movable by a control rod substantially perpendicularly to the yoke will move the yoke toward the locking ring and lock the yoke in engaging condition with the ring when the locking cube is above the yoke.
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