| 摘要 |
A document folder includes upper and lower sheets, and a C-shaped clamp. The upper and lower sheets have a common edge. The lower sheet has an opening formed adjacent to the common edge. The opening has opposed first and second edges which are parallel to the common edge. The lower sheet further has a plate member connected fixedly to the internal face of the lower sheet in order to cover the opening. The size of the plate member is approximately equal to that of the upper sheet. The plate member is thicker and harder than the upper sheet. The C-shaped clamp has upper and lower clamping plates, and a curved portion. The lower clamping plate has a tapered projection which abuts against the plate member. The C-shaped clamp is movable between a clamping position, where the curved portion of the C-shaped clamp abuts against the common edge and a releasing position, where the shoulder portion of the projection abuts against the first edge of the opening, thereby preventing the C-shaped clamp from being separated from the upper and lower sheets.
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