| 摘要 |
PROBLEM TO BE SOLVED: To provide a coming-out preventive structure which can reduce or eliminate the axial direction displacement of an insertion member to a tubular member, without forming an insertion hole and a difference in level to the tubular member, and without reducing the assembling property. SOLUTION: In a circular area between the first circular groove 25 on the inner periphery of a tubular member, and the second circular groove 26 on the outer periphery of an insertion member 22 inserted to the tubular member 6, a pair of stop rings 23 with end parts deformable elastically in the diameter direction are provided. By contacting the stop rings 23 provided to the circular area, to the inner surface of the both circular grooves 25 and 26, the axial direction displacement of the insertion member 22 to the tubular member 6 is regulated. By the elastic deformation of the stop rings 23 in the diameter direction, the insertion member 22 can be taken out of and put in the tubular member 6. One side of both the circular grooves 25 and 26 is formed along the circumference concentric to the axial core of the tubular member 6, while the other side is formed along the spiral around the axial core of the tubular member 6. The width in the axial direction of the other side of the both circular grooves 25 and 26 is made to exceed the width in the axial direction of the stop rings 23. |
