| 主权项 |
1. A boom truck for handling a container with a weight of up to 45 tons, both above as well as below ground level, comprising:
an elongated chassis having a front end, and a rear end, a front pair of wheels, a rear pair of wheels, a telescopic lifting boom having a base portion with a rear end and a front end, and a telescopic arm defining the front end of the lifting boom, wherein the lifting boom is pivotally mounted for pivoting in a vertical plane and extends above the chassis and past the front pair of wheels, a lifting unit, which is arranged in connection to the front end of the lifting boom and, with the lifting boom in a retracted position, is separated by a space from the front end of the chassis for carrying the container, a support structure for supporting the lifting boom, said support structure comprising a first support arranged on the chassis at the rear portion thereof, for extending in a direction upwards, wherein the lifting boom is non-articulated and the front end of the lifting boom is equipped with a top lifting yoke for handling the container, the support structure further comprises a second support, in the form of an elongated, linear bearing and support beam body for mounting and supporting the lifting boom, said bearing and support beam body extending in the longitudinal direction of the boom truck and having a rear end located substantially in alignment with the rear end of the chassis, and a front end located substantially in alignment with the front end of the chassis, the bearing and support beam body has a fixed length and is pivotally mounted to the first support about a horizontal, rear bearing axis located substantially in alignment with the rear end of the bearing and support beam body, the lifting boom is pivotally mounted to the bearing and support beam body about a horizontal, front bearing axis, which is parallel with the rear bearing axis and which is located substantially in alignment with the front end of the bearing and support beam body and substantially in alignment with the front end of the base portion of the lifting boom, and the support structure further comprises a rear actuator for raising and lowering the bearing and support beam body and the lifting boom as a unit, while pivoting about the rear bearing axis during said handling of the container above the ground level, and a front actuator for pivoting the lifting boom about the front bearing axis during said handling below the ground level, wherein the front actuator is connected between a first bearing device secured to the bearing and support beam body and a second bearing device secured to the base portion of the lifting boom, the second bearing device being positioned above the lifting boom such that the front actuator extends above the lifting boom. |
