| 摘要 |
Jack characterised in that it consists of a deformable parallelogram, one of the horizontal faces of which rests on the ground while the other horizontal face supports the load to be lifted, the two horizontal elements being connected by oblique sides having a variable inclination, one of the oblique sides carrying a controlling lever intended to adjust the pivoting of this oblique element by deforming the parallelogram and by moving the two horizontal faces apart (if the load is carried by the upper horizontal face, a carriage slides on the said upper face in order to follow the longitudinal displacement of this face in a direction parallel to its plane, during the lifting of the load. <IMAGE>
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