| 摘要 |
Side walls (25) are provided with: semicircular protrusions (251) configured so as to protrude from the side walls (25) in a direction away from outer surfaces of the side walls (25) such that the protrusion amount increases as the protrusions approach an insertion position from a withdrawal position; guidance members (252, 252A) which movably guide handling members (8) between the insertion position and the withdrawal position; and rear-side engagement parts (253) formed at rear sides of the pair of side walls (25). The handling members (8) are provided with: substantially plate-shaped handling-member main bodies (81) disposed along each of the pair of side walls (25); circular position-restriction through holes (84) which are formed through the handling-member main bodies (81) in a thickness direction of the handling members (8), and which are capable of being engaged by the semicircular protrusions (251); handling-member-side guided inner parts (86) which engage with the guidance members (252, 252A), and which have the movement thereof guided between the insertion position and the withdrawal position by the guidance members (252, 252A); and rear-side parts (87) to be engaged which are capable being engaged by the rear-side engagement parts (253) as a result of movement of the handling members (8) from the withdrawal position to the insertion position. |
