| 摘要 |
A housing (11) comprises: a lower receiving unit (11a) provided to be extended from the inside of a slot (15) to the front of the slot (15), and also having a flat mounting surface Sa which is provided to be extended in an array direction of a lower beam and has the lower beam mounted therein. In addition, the housing (11) comprises: a rib unit (11b) provided on the mounting surface Sa, and provided to be extended from the inside of the slot (15) to the front of the slot (15) to form a groove Za to maintain the lower beam. An end unit of the rib unit (11b) positioned in front of the slot (15) is inwardly arranged than that of the lower receiving unit (11a) positioned in front of the slot (15). |
