| 摘要 |
<p>An extensible reach load lifting mechanism for a truck or similar vehicle in which a first boom assembly is mounted pivotably from the rear portion of the vehicle and extends lengthwise thereof having a hydraulic cylinder actuator for raising and lowering the boom about the pivot connection, the boom also forming a trackway. A trolley assembly is mounted in the trackway of the boom and a drive mechanism actuates selectively the trolley longitudinally of the boom, a second boom assembly which extends lengthwise of the first boom being pivotably mounted from the trolley for raising and lowering movement about the trolley pivot by a second hydraulic cylinder actuator, and for actuation lengthwise of the first boom on the trolley assembly at any position of elevation of the first boom. A load handling device is supported from the outer end of the second boom and is tiltable in relation thereto, slave cylinder means being suitably connected between the vehicle and the first boom and between the first and second booms for actuating a load tilt cylinder during elevation of either one or both of the first and second booms for maintaining the load handling device in a selected attitude.</p> |
