| 摘要 |
Lower scissors (3) arrangement has at each end at least two mutually spaced bearing points for threaded journals (18) that are coupled with linkage heads (17). Carrying bolts (19) supported by bearing rods (16,30), defining on either side the linkage heads (17) and mounted on the base frame (2) and an upper scissors arrangement (4) pass transversely through the linkage heads (17). A pivotable linkage rod (7) can be provided at its ends with the linkage heads (17), through the mediation of which and the bearing rods (33, 13) it is on one side coupled in swingable manner with the upper scissors arrangement (4) and on the other side with the base frame (2). |
