| 摘要 |
<p>In order to overcome the disadvantage of overspinning of a winch drum (16) when a disconnect device (70) adjacent the drum is disengaged, a drag brake apparatus (132) is provided for limitedly restricting the rotation of the drum when an actuator (136) having a braking element (135) is continually urged against the drum by a spring (152). A control mechanism (155) includes a control lever assembly (157) movable to operate a hydraulic valve assembly (197) for the primary control of the winch drum (16), and movable to operate an associated valve (219) for controllably directing pressurized fluid to the actuator for supplementing the spring force. Thus, a first drag brake mode can be attained for substantially freespool operation of the drum, and a second drag brake mode can be attained for controlled load dropping operation of the drum.</p> |
