| 摘要 |
The invention relates to a pneumatic jack with multiple and variable working strokes, which is supplied via the orifice 20, the air pressure pushes the piston 7, nut 8 and rod 5 assembly forwards in a movement of translation, which drives a ball screw 6 rotationally. A brake disc 14 is fixed at the rear of the ball screw 6. When the brake is acted on, the ball screw 6 is locked, and this immobilises the rod of the jack 5. For the return of the jack, supply takes place via the orifice 19 and for locking the rod of the jack, the brake is acted on as previously. <IMAGE>
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