| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint with locking washers that facilitates precise positioning and permits a selected mounting position. SOLUTION: First locking washers 21a and 21b have first mounting surfaces parallel to the direction of diameter of a downstream socket 12. The first locking seats 21a and 21b are provided with lateral indication portions 26a and 26b that pass the axis center of the downstream socket 12 and give radial indications to the axes of the downstream socket 12 and an upstream socket 13. A second locking seat 31 has a second mounting surface 32 parallel to the direction of diameter of the upstream socket 12. The second locking seat 31 is provided with a longitudinal indication portion 33 that gives an axial indication of the upstream socket 13 passing the axis center of the downstream socket 12. The alignment of the lateral indication portions 26a and 26b and the longitudinal indication portion 33 with a horizontal line and a vertical line marked on a crossbar brings the axis center of the downstream socket 12 to the intersection of the horizontal and vertical lines. The alignment of the longitudinal indication portion 33 with the vertical line marked on the crossbar positions the axis center of the downstream socket 12 on an extension to the vertical line.
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