ABSTRACT OF THE DISCLOSUREA slack adjuster for axially moved push rods is provided.An axially extending rotating actuating shaft turns a helical,driving cam member that in turn axially displaces a non-rotatingdriven cam member. The driving and driven helical cam membersare located in a housing with the actuating shaft extending out ofone end thereof and a threaded push rod extending out of the otherend of the housing. A helical return spring is positioned betweenthe driven cam and the inner wall of the housing to bias the cammembers together. The push rod is held against rotation intern-ally of the housing by a flange whose periphery is frictionallyengaged by the return spring. A nut is threaded onto the rod andengaged by the driven cam member to transmit axial force to thepush rod; and relative extension of the push rod from the cammembers is accomplished by a one way spring brake acting on thenut and a disc clutch drive between the driving cam and nut. Lostmotion is provided to prevent rotation of the nut on the rod duringnormal push rod clearance, and rotation of the nut on the push rodoccurs when excessive push rod clearance occurs.
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