| 摘要 |
The file has a rectangular shape with or without a top closure flap (1e). The rear panel (1a) has a pair of lateral flaps (1c) which engage with the cooperating lateral flaps (1g) of a pivotable front panel (1f). The two pairs of cooperating lateral flaps engage by fasteners (4,5) on one flap which fit into slots (1l,1m,1n) on the other flap. The slots are arcuate in shape and of increasing length towards the top of the file, allowing relative movement of the rear and front panels up to a fully-open position at a predetermined angle ( alpha ). The front panel may have a gripping tongue (7) or similar attachment for pulling the file to its open position.
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