| 摘要 |
A vehicle is constructed with a bulldozer blade and a pair of articulated push arms which may be folded or unfolded by operation of independently extendible hydraulic jacks to extend or retract the blade relative to the vehicle. The push arms have short and a long component which are pivotally interconnected with the short component being pivotally connected to the vehicle and the long component being pivotally connected to the blade. A mechanical stop prevents movement beyond a fully retracted position. Extendible jacks are also utilized to control the elevation, tilt and pitch of the blade and a stabilizing link is provided to resist lateral movement of the blade relative to the vehicle under load.
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