| 摘要 |
<p>A nipple for joining end to end and in a fixed and rigid connection cylindrical electrodes made of carbon or graphite and having at their ends axial screw-threaded sockets, provided in each of its two threaded surfaces with bored holes used as reservoirs for one or several cement components, characterized by having at the outer end of each reservoir one or several grooves, extending through the threads in following lines terminated short of the longitudinal center of the nipple at their inner ends and short of the end faces of the nipple at their outer end for the purpose of having at least one continuous thread being left at each groove end in such a way that when the nipple is heated and the binders melt and flow out of the reservoirs through the grooves towards the clearance spaces between the threaded surfaces of the sockets and the nipple which are cut by and open into the grooves while being prevented from flowing towards the end faces of the electrodes and the spaces between the nipple ends and the bottoms of sockets by the dams created by the continuous threads left at each groove end. <IMAGE></p> |
