| 摘要 |
<p>A pawl actuator for use with a toothed wheel, including: a pawl member having a mounting section; and a tooth engagement section, the pawl member being mountable to a support structure at the mounting section and the tooth engagement section being movable between a tooth engaged position and a tooth disengaged position, the pawl actuator including a biasing arrangement to bias the tooth engagement section in a first direction toward the tooth engaged position when the tooth engagement section is in a first section of travel between the tooth engaged position and the tooth disengaged position and in a second direction toward the tooth disengaged position when the tooth engaged section is in a second section of travel between the tooth engaged position and the tooth disengaged position, the pawl actuator being further arranged to alter the direction in which the tooth engagement section is biased at a region intermediate the first and second sections of travel, the pawl actuator including an actuating arrangement arranged to act on the pawl member for displacing the tooth engagement section against the bias of the biasing arrangement from the tooth disengaged position through the second section of travel to the intermediate region, to a change of bias position within the intermediate region at which the direction of bias changes so that the biasing arrangement thereafter biases the tooth engagement section towards the tooth engaged position.</p> |
