| 摘要 |
<p>In a crane (1) moving an attachment member (14), a telescopic arm (7) has an attachment portion (8) to a support body (4), at least one intermediate portion (11) and an end portion (12) movable with respect to each other under the bias of a linear actuator (16), and a feeding circuit (22) housed in the intermediate (11) and end (12) attachment portions to control the attachment member (14); the feeding circuit (22) comprises a first telescopic tube circuit (24) surrounding the linear actuator (16), a second rigid tube circuit (25) inside and integral with the end portion (12), and a guided flexible tube circuit (26) interposed between the two rigid tube hydraulic circuits (24)(25).</p> |
