| 摘要 |
<p>Disclosed is a universal fitting that eliminates costly, complicated machining processes, and the problem of expanding appearance, without increasing its weigh. The opposing ends of a single tube is embedded with freely slidable rotating balls. The rotating balls are each encased with a pliable material externally and embedded into a ball-shaped recess of a socket. The each rotating balls has an external face that is in sliding contact with an internal face of the ball-shaped recess of the socket.</p> |
