| 摘要 |
<p>Disclosed is an externally-ventilated, high-load-carrying-capacity strip resistance unit which consists of a copper-free, meanderpattern resistance strip, the deflecting locations on one end of which are held resiliently to a frame. The deflecting locations on the other end consist of welded-on, copper-containing, U-shaped brackets to which connecting bolts, made of a material containing a larger proportion of copper, are welded. The graduated amounts of copper in the brackets and connecting bolts prevents intercrystalline corrosion of the copperfree resistance strips. Each connecting bolt has a square section which fits into a square recess in an insulating cup, the square outside contour of which projects through a corresponding square aperture in the frame to which it is secured by means of screws, so that the deflecting locations, together with the connecting bolts, are held rigidly and secure against rotation in the frame. Thus when the connecting cables are tightened to the necks of the connecting bolts, there is no turning of the deflection locations and no contact between adjacent welded-on resistance strips.</p> |
