| 摘要 |
PROBLEM TO BE SOLVED: To improve mounting structure and mounting workability by using a non-elastic annular body as a connecting means for a box nut to a connection fitting. SOLUTION: A recessed groove continuous in a circumferential direction is formed on the outer peripheral surface of a juncture of the connection fitting and a groove is formed on the inner peripheral surface of a box nut in a position corresponding to the recessed groove when the box nut is fitted to the juncture of the connection fitting. Even more, the non-elastic annular body is fitted between the groove and the recessed groove. As a result, the strength of the juncture may be sufficiently maintained and the workability in assembling may be extremely improved. Since the annular body is non-elastic, the disengagement of the box nut when the connection fitting is tightened to the connecting port of a high-pressure gas cylinder by the box nut is prevented and the sufficient withstanding to the strong tightening and the assurance of the sufficient connecting strength to the high-pressure gas cylinder are made possible.
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