AUTOMATIC PARKING BRAKE FOR TRUCK MOUNTED BRAKE CYLINDER

摘要

An automatic parking brake for a truck mounted brake cylinder. The automatic parking brake includes rod that is interconnected to a piston of the brake cylinder and can prevent the piston from returning to the brakes releases position. The rod is controlled by locking nut that will rotate if the rod moves axially through the locking nut and a locking sleeve that is moveable between a locked position, where the locking sleeve engages the locking nut and prevents from the nut from rotating, and a released position, where the locking sleeve is disengages from the locking nut and the locking nut is free to rotate. A spring provides a force biasing the locking nut into the locked position, and brake pipe pressure biases the locking sleeve into the released position.

主权项

1. An automatic parking brake for a truck mounted brake cylinder, comprising:
a housing having a port for receiving brake pipe pressure; a locking nut positioned in the housing for rotational movement; a rod extending through the locking nut and interconnected at one end to a piston of the brake cylinder, wherein the rod is connected to the locking nut via threads so that the locking nut will rotate if the rod moves axially through the locking nut; a locking sleeve moveable between a locked position, where the locking sleeve engages the locking nut and prevents from the nut from rotating, and a released position, where the locking sleeve is disengages from the locking nut and the locking nut is free to rotate; a spring providing a force biasing the locking nut into the locked position; and a brake pipe pressure chamber in communication with the port and positioned to bias the locking sleeve into the released position if the brake pipe pressure in the chamber exceeds the force of the spring.