| 摘要 |
<p>The crane has two crane arms (11, 12) connected with each other by a hinge (14) and pivotable relative to each other by a drive having a piston-cylinder-unit (13). The crane arms reach a dead centre based on an end position when a longitudinal axis of the piston-cylinder-unit is preset in alignment with the hinge. The crane arms rest parallel to each other in the end position. Another drive i.e. linear drive, stands in effective-connection with one of the arms by a detachable coupling unit. A dead centre position of the piston-cylinder-unit to the hinge is conquerable by the latter drive.</p> |
