| 摘要 |
<p>The crane is mounted on the platform of a trailer and consists of a base frame in the form of a carriage, fitted with driven rollers (16). The rollers move along the guide rails (3), which are integrated into the platform of the trailer. The upper part of the base frame carries an articulated arm (8), and on its lower part, pairs of retaining hooks (26) which fit around the upper section of the I-beam guide rails. The retaining hooks are moveable by an operating mechanism (30) between a primary locked position and a secondary unlocked position. <IMAGE></p> |
