| 摘要 |
<p>PURPOSE: To use a stroke of a hydraulic extending and shortening device in a telescopic jib crane in one direction for direct drawing of a telescopic jib part, and in another direction for indirect drawing of another telescopic jib section which is realized via a rope after a telescopic section is locked. CONSTITUTION: A telescopic cylinder 8, capable of moving in an extending and shortening device, can be locked to one telescopic jib section 3, 4, the telescopic jib sections 3, 4 can be locked to each other and to a jib base body 2 at their end positions, and a telescopic rope 11 is guided between the leg part of the telescopic cylinder 8 and the leg part of the second or another telescopic jib section 4 via a deflecting roller 10 to a head part of the telescopic jib section 3 on the operator side. A rewinding rope 12 is guided between a tip part of the telescopic cylinder 8, capable of moving and the leg part of the second or another telescopic jib section 4 via a deflecting roller 13 to the leg part of the telescopic jib section 3 on the operator side.</p> |
