| 摘要 |
This invention refers to a tool for electro fusion of a sleeve (2) and a pipe (1) of weldable plastics comprising a clamping tool for pressing an axially slotted sleeve 5 (2) around a pipe (1) surrounded by an welding thread (9) conducting electricity, which welding thread (9) is arranged to supply welding heat to the plastics material. The clamping tool is provided with a flexible clamping strap (3) intended to be led as a loop around said sleeve (2) and having one end rigidly attached to a bridge (4) movably mounted in the frame of the tool, and the other end of which being attach- o able to the same bridge (4) by means of a locking mechanism (5) allowing the clamping strap (3) to move freely in one direction for adjusting the length of the loop to the periphery of the sleeve (2) and locking the movement of the clamping strap (3) in reverse direction in order to enable generation of a tension force in the loop, when said bridge (4) by means of a tension bolt (7) acting between the frame 5 (8) of the tool and the bridge (4), is arranged to be moved in a direction radially away from the sleeve (2) simultaneously as the tool rests against said sleeve (2). The invention is characterized in that the tool lowest at the bottom of the frame (8) is provided with two support rolls (6) remote from each other, between which rolls said clamping strap (3) is led and which support rolls (6) are arranged to be in contact with the sleeve (2) at each side of the axially extending slot of said sleeve (2) during the electro fusion operation. |
