| 摘要 |
<p>The tractor (10) has provisions for jointing swinging arms (12) and (15) in points (11) and (14). The other ends of the arms are connected by joints (13) and (16) to the basic part (17) with rungs (18). The basic part of the ladder is hereby positioned at an angle of sixty to eighty degress to the horizontal and the weight of the tractor (10) provides a sufficient stability. The swinging arms (12) and (15) allow a lifting of the basic part of the ladder and the ladder can be transferred to any required operating point. On the upper end of the basic part (17) of the ladder a further section (22) of the ladder is connected by joint (19) and an elevation of this part can be achieved by operating the hydraulic cylinders (29). On the section (22) a further ladder section (23) is mounted, which slides on the upper surface of the section (22).</p> |
