| 摘要 |
A device for clamping relative to each other at opposite end edges two metal objects which are to be welded together including a draw bolt, an element screwed onto the draw bolt forming a tension nut, and a bridge piece which has an opening through which the draw bolt passes. The draw bolt at one end bears a relatively thin part with a clamping plate or similar element and at least one element is connected to the draw bolt above the relatively thin part which forms at least one protuberance projecting outwards. The bridge piece has guide means for guiding the protuberance in such a way that an up and down movement of the screw bolt relative to the bridge piece is permitted, but rotary movements of the screw bolt about its central axis are prevented. The relatively thin part may be formed by a blade-shaped member incorporating a window and said clamping plate is arranged for a pivotal movement from a position in which it lies flat inside the window to a position substantially perpendicular to said blade shaped member and visa versa.
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