| 摘要 |
<p>A telescoping device in the form of a support pillar for a load vehicle such as a timber carrying vehicle consists of a tube-formed base part (11), a tube-formed intermediate part (12) telescopically carried by the base part, and a top part (13) telescopically carried by the intermediate part. The base part (11) has a threaded rod (15) that is rotatable by a motor (20). When the rod (15) is rotated, a housing (14) that is guided in the base part (11) and carries a nut (30) moves up along the rod (15) when the nut is locked in the housing (14) against rotation. The housing (14) is part of and carries the intermediate part (12). When the intermediate part (12) is extended and the motor rotation is reversed, the nut (30) will rotate with the rod (15) and rotate a second thereaded rod (16) via a gear wheel transmission (31, 32). The rod (16) is carried by the housing (14) and when rotating, it extends the outer part (13) of the pillar. Both extension and withdrawal of the pillar are controlled in steps and in sequence by the repeated reversal of the motor rotation.</p> |
