| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize and to avoid the reduction of strength and the increase of cost. SOLUTION: As a fitting piece 11 moves in parallel in a radial direction between an engagement position of other side cylindrical member T and an engagement releasing position, a clearance between a male screw shape connecting part M becomes uniform in an axis direction at the releasing position. Therefore, the fitting piece 11 does not have a useless space at a far part from a slanting center like a slanting type locking piece. If a spherical direction dimension of a piece of the fitting pieces 11 is increased for increasing an engagement strength, it does not come in contact with the male shape connecting part M. That is, as a number of the fitting pieces 11 can be reduced, it is not required to narrow a clearance between the fitting pieces 11 of a joint main body 10 to avoid the decrease in strength. Also, the shape of the joint main body 10 is simplified, resulting in manufacturing cost reduction. |
