| 摘要 |
<p>A first engagement recess 41 and a first inclined surface 43 continuing from an open portion of the first engagement recess 41 are formed in a front end portion of a pedestal 1. A second engagement recess 42 and a second inclined surface 44 continuing from an open portion of the second engagement recess 42 are formed in a rear end portion of the pedestal 1. An inclination angle of the first inclined surface 43 with respect to a reference line that is a straight line connecting a contact point between the first engagement shaft 46 and the first inclined surface 43 and a contact point between the second engagement shaft 50 and the second inclined surface 44 is greater than an inclination angle of the second inclined surface 44 with respect to the reference line. The first inclined surface 43 and the second inclined surface 44 are disposed such that the first engagement shaft 46 and the second engagement shaft 50 disposed in the body 3 can be respectively contacted with the first inclined surface 43 and the second inclined surface 44 at the same time.</p> |
