| 摘要 |
<p>An automatic adjuster comprises a transmission member, suitably a crown wheel, and thrust assemblies, of which the effective lengths are adjustable to adjust the spacing between a pair of shoe-ends, and the crown wheel is coupled to a brake-applying cam through a lost-motion connection, and a clutch. In a brake-applying mode the transmission mechanism is operative to increase the effective lengths of the thrust assemblies after the lost-motion has been taken up and until a critical point is reached at which the clutch slips in one direction. An inhibit mechanism is incorporated for limiting movement of the crown wheel in the opposite brake release mode until any previous excess movement of the crown wheel in the brake-applying mode has been accommodated by slippage of the clutch in the opposite direction.</p> |
