| 摘要 |
The double knuckle-joint is consisting of a sleeve (1) fitted at bith ends with sphereheads (2, 3) and two ring nuts (4, 12) to be mounted on the sphereheads (2, 3) of the sleeve (1) for connection of the feed pipe or cock to the distributor (11) which can thus be moved or swiveled over a wide range in the desired direction with respect to the feed pipe or cock. |
