Expansible chamber devices – Working member moves load and latching means for load
Patent
1986-02-12
1986-09-02
Tudor, Harold J.
Expansible chamber devices
Working member moves load and latching means for load
92 20, 92 22, 92 24, 92 63, 92 64, 188265, 303 89, F15B 1522
Patent
active
H00001171
ABSTRACT:
An air brake includes a service brake chamber which actuates a push rod. A collet brake chamber is partially defined by a collet brake diaphragm. A locking collet is mounted to the collet brake diaphragm and includes a bore through which the push rod passes. A collet brake spring biasas the collet into a tapered collet hole to clamp the collet onto the push rod to prevent the movement of the push rod toward the brake off position. Application of pressure to the collet brake chamber overcomes the force of the collet brake spring and moves the collet away from the tapered collet hole to allow the push rod to move freely. The collet can be moved towards and locked against the collet brake spring to prevent the collet from engaging the push rod. This allows the user to effectively deactuate the collet brake feature when desired, such as to mechanically release the push rod from the collet when the vehicle is stationary.
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