| 摘要 |
The insulating material from which the draw bar (11) is made comprises cross-bound polyethylene or other similar polymer, and each end of the bar has at least one part (12) which is located further from the bar centre line (17) than at least one part of the corresp. fixture located nearer to the centre of the draw bar in a longitudinal direction. It also has at least one part located closer to its centre line than at least a part of the corresp. fixture located closer to the centre of the bar in a longitudinal direction. At least one of the fasteners used (14) has the form of a socket or casing, and one is ball-shaped. The draw bar itself is tubular, with a like-shaped end (10), in front of which there is cross wall. The end of the bar on the inside and one the connecting side of the cross wall is covered with an electrically conductive layer. The fixture (14) where the tubular end is anchored has a pin (14) which inserts in that end. |
