| 摘要 |
A truck-mounted towing crane is constructed with a tubular boom pivoted at one end and raised by a power cylinder. A tow bar assembly is pivotally mounted to the other end of the boom so that the former may be folded back to a storage position and the boom lowered for storage of the crane in a small space. The tow bar assembly includes a downward and rearward extension for the boom and a cross-bar supported from below at its center by a ball joint connected to the free end of the boom extension.
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