| 摘要 |
A multiply extensible lifting frame is provided having a standing mast and one or more middle and inner masts slidable relative to one another, at least one lifting press cylinder connected with the standing mast having a piston connected to the intermediate mast, at least one chain connected at one end with the standing mast and at the other end with the inner mast and supported over a roller on the middle mast, a second lifting press connected with the inner mast and carrying a chain over a roller thereon, the chain connected at one end to the inner mast section and at the other end to the lift slide the improvement in which the at least one chain is carried in a plane parallel to the longitudinal median plane of the vehicle, at the at least one lifting press cylinder is in the same plane, and a lateral boom to which the at least one chain is fastened, is fastened at the lower end of each inner mast column.
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