| 摘要 |
A telescopic boom with two sliding sections 1,2, comprises one supporting and/or guiding assembly 3 with at least two members, shown as wheels 4, supported by one, 3, of the two sections, whereas a plane face 5, provided on the second section, is in resting contact on the members 4. Each member 4 is associated to a jack with two elements 11, 12 movable one with respect to the other, the first, 11, of said two elements being fixed on one section, whereas the second, 12, supports the member 4 and each jack comprises a chamber 20 adapted to contain a substantially incompressible fluid and to communicate with the chambers 20 of the other jacks of the said supporting and/or guiding assembly. <IMAGE> |
