| 摘要 |
1434642 Seaming non-metallic sheet material RIDGE TOOL CO 8 Oct 1973 46942/73 Heading B5K [Also in Division F2] Plastics pipes 12, 16 to be joined by fusion are clamped in apparatus comprising a first clamp 10 fixed to a frame, a second clamp 14 carried on the cylinder 22 of an hydraulic system for bi-directional axial movement on a fixed piston 32, fluid being fed to or expelled from either end of the cylinder through bores 35, 36 in piston-rods 26. The movable clamp 14 may be mounted on one or two such cylinders 22.
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