| 摘要 |
<p>A hoisting crane (1) comprising a telescopic jib (5), which is pivotally connected to a chassis (4) near a first end (6) and which comprises a hoisting mechanism near a second end (11) remote from said first end (6). The telescopic jib (5) comprises at least two unround, coaxial tubes (21, 22) which are capable of sliding movement relative to each other, which can be moved relative to each other by pneumatic means, wherein the first tube (21) enclosing the second tube (22) forms a cylinder for the second tube (22), which forms the piston.</p> |
