| 摘要 |
Machine consisting of a box with extendible canvas, which box has end hooks via which they are mounted on a lifting apparatus anchored to the front part of a tractor vehicle, the slope of the lifting device being adjusted by means of tensioners. The drive arms for actuating the canvas are rotated by individual hydraulic cylinders which act on plug-in guides in such a manner that, in the respective extension, the arms cross over. The machine also has a vibrator with its cable which is positioned by pulleys and which passes through the inside of a tube until it reaches the front part of the tractor, being tied in the form of a collar to the shaft. <IMAGE>
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