| 摘要 |
The invention comprises a top board with a plurality of buckling portions, each of two sides of the top board has a bearing hole, a sustaining frame connected with the top board, a spring hole provided in one side of the top board, a cover with an arc rim, two end portions of the cover pivotably mounted in bearing holes of the top board, and a spring connected with the spring hole of top board and providing an elasticity to the cover. The side of the sustaining frame corresponding to the arc rim has a stop projection extending therefrom, the cover corresponding to the stop projection has a receiving notch cooperating with the stop projection to stop the cover when forced to pivot. One side of receiving notch in the cover near the sustaining frame has a flange extending therefrom upwards toward the vertical card-inserting direction. The top of the flange is horizontal for further cooperating with stop projection when the cover is forced to pivot.
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