| 摘要 |
PURPOSE:To attach and detach freely an additional device to and from a housing by inserting a hook bar having an L-shaped section formed to the additional device into a through hole for insertion of the hook bar formed on the upper surface side of the housing, then hooking the hook bar to the upper surface plate of the housing. CONSTITUTION:A recess part 4 is formed at a top plate part 1c of a housing 1 which constitutes a telephone exchange board, and through holes 5a and 5b for insertion of hook bars are formed at the bottom part of the part 4. Then hook bars 8a and 8b having L-shaped sections formed to a cover body 7 are inserted into those holes 5a and 5b. The tips of the bars 8a and 8b are hooked to the bottom plate of the part 4. Thus the cover 7 can be attached tight to the part 1c of the housing 1. Then the tip of a driver or the outer circumference part of a coin is put into a notch 11 at the rear edge of the housing 1, then pried toward an arrow. In such a way, the cover 7 can be easily removed. |
