| 摘要 |
<p>The extension is for the main jib of a telescopic-jib crane, partic. a high-capacity one, having a basic jib with one or more extensible sections and also an extension section attached to the last of these and folding against the side of the main jib for transport. The extension section (8) has at its coupling end one or more movably attached connecting feet (11,12), which can be slid as far as the fixing devices (6,7) of the last extensible section (5), being lockable in one or more extension positions. In one of these it can be possible to secure them to the fixing devices, and they protrude sideways beyond the attachment point to the extension section.</p> |
