Automatic brake adjusting mechanism
 A brake assembly including a brake actuating and automatic slack adjusting plunger assembly slidably mounted in a brake support. The plunger assembly includes means independent of the system reaction force, such as a spring, for biasing an adjusting nut to the brake released position and an axially movable rotary driving connection between the adjusting nut and a rod to permit the system reaction force to move the rod relative to the adjusting nut as the brake is released. 
Rockwell International Corporation
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Alton B. Bruce D.
Holmes Anderson