| 摘要 |
The present invention is a method for making an electrically insulative coupling which is inserted between and coupled to two lengths of metallic pipe. The method comprises the steps of machining one end of two short sections of metallic pipe to provide a circumferential groove, inserting O rings onto the grooves, inserting the machined ends of the pipe sections into a central sleeve, injection moulding an outer insulative sleeve over the machined pipe ends and central sleeve, and pressing a metal outer sleeve over the outer insulative sleeve. By this method the electrically insulative coupling is manufactured quickly and inexpensively. |
