| 摘要 |
<p>An actuator for a brake comprises a piston and cylinder assembly 125, 124 with an adjustment mechanism to control movement of the piston 125 towards the end wall 119 of the cylinder bore 124. The adjustment mechanism includes a strut formed by screw and nut members 132, 135 having interengaging screw-threaded formations 136, 137 and means to effect relative rotation of the screw and nut members 132, 135 upon excessive movement of the piston 125 during fluid pressure operation of the actuator. The nut member 135 extends through the end wall 119 of the cylinder bore 124 and an external lever mechanism (156; 160) is provided to move the nut member 135 relative to the actuator body 122, to effect mechanical operation of the actuator.</p> |
