| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve fixing (holding) performance to an arm piece.SOLUTION: A concave part 32 to be engaged is formed at a part 30 to be fitted of an arm piece 22, and the concave part 32 to be engaged includes a first orthogonal surface 34 and a second orthogonal surface 36 which are arranged along the direction orthogonal to the longitudinal direction of the arm piece 22. An engagement piece 50 of a retainer 20 is arranged in the concave part 32 to be engaged, and the engagement piece 50 includes a first facing surface 52 and a second facing surface 54 facing to the first orthogonal surface 34 and the second orthogonal surface 36. Thus, the engagement piece 50 is displaced along the first orthogonal surface 34 and the second orthogonal surface 36 when spring back is generated in a squeezing part 40, so that distance change between the first facing surface 52 (second facing surface 54) and the first orthogonal surface 34 (second orthogonal surface 36) is suppressed. As a result, increasing of a moving amount of the arm piece 22 relative to the retainer 20 can be suppressed, even if the arm piece 22 is moved relative to the retainer 20.</p> |
