Document folder

Abstract

A document folder includes upper and lower sheets, and a C-shaped clamp. The upper and lower sheets has 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 with the common edge. The lower sheet further has a plate member which has an edge fixedly connected to the internal face of the lower sheet in order to cover the opening. The C-shaped clamp has upper and lower clamping plates, and a curved portion. The lower clamping plate has a tapered projection which abuts the plate member. The C-shaped clamp is movable between a clamping position, where the curved portion of the C-shaped clamp abuts the common edge and a releasing position, where the shoulder portion of the projection abuts the first edge of the opening, preventing the C-shaped clamp from being separated from the upper and lower sheets.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a document holder, more particularly to a document folder which has a clamp to clamp the documents, papers, etc. that are received in the document folder.

2. Description of the Related Art

Applicant's U.S. Pat. No. 5,285,952, issued on Feb. 15, 1994, disclosed a document folder which comprises an upper sheet, a lower sheet and an elongated folding portion which interconnects the upper and lower sheets. A C-shaped clamp clamps on the folding portion in order to hold securely the documents, papers, etc. which are received in the document folder. Two parallel silts are formed in the lower sheet adjacent to the folding portion. Two projections extend oppositely from the free edge of the lower clamping plate of the C-shaped clamp and are received slidably and respectively in the slits. Although the aforementioned document apparently achieve their intended purpose, there is always a need for a document folder which can be manufactured at a lower cost.

SUMMARY OF THE INVENTION

It is therefore a main object of the present invention to provide a document folder which can be manufactured at a lower cost as compared to the document folder of the prior art.

Accordingly, the document folder of the present invention comprises:

upper and lower sheets having a common edge which interconnects the upper and lower sheets, the lower sheet having an opening formed adjacent to the common edge of the upper and lower sheets, the opening having opposed first and second edges which are parallel with the common edge, the first edge of the opening being adjacent to the common edge while the second edge of the opening is distal from the common edge, the lower sheet further having a plate member which is connected to the internal face of the lower sheet, the plate member having a first edge which is fixedly connected adjacent to the second edge of the opening, and a second edge which is opposed to the first edge of the plate member and which extends adjacent to the common edge so as to cover the opening; and a C-shaped clamp having upper and lower clamping plates clamping respectively onto the upper sheet and the plate member through the opening, and a curved portion which interconnects the upper and lower clamping plates, the lower clamping plate having a tapered projection which projects from the distal edge of the lower clamping plate and abuts the lower face of the plate member, the projection having a shoulder portion facing the curved portion, the C-shaped clamp being movable between a clamping position where the curved portion abuts the common edge and a releasing position where the shoulder portion of the projection abuts the first edge of the opening, preventing the C-shaped clamp from being separated from the upper and lower sheets.

In a preferred embodiment, the lower sheet has two curved slits formed therein. Each of the curved slits extends from a respective one of the opposed ends of the first edge and has a terminating end which is distal from the common edge. Therefore, the lower sheet can be prevented from being torn along the first edge of the opening when the C-shaped clamp is moved from the clamping position to the releasing position.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features and advantages of this invention will become apparent in the following detailed description of a preferred embodiment of this invention with reference to the accompanying drawings, in which:

FIG. 1 is an exploded view of a preferred embodiment of a document folder according to the present invention, with a part of the document folder being cut away for clarity;

FIG. 2 is a perspective view of the preferred embodiment of the document folder according to the present invention;

FIG. 3 is a sectional view illustrating the C-shaped clamp of the document folder of the present invention in a clamping position; and

FIG. 4 is a sectional view illustrating the C-shaped clamp of the document folder of the present invention in a releasing position.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1, a preferred embodiment of a document according to the present invention is shown to comprise an upper sheet 41, a lower sheet 42 and a C-shaped clamp 50.

A common edge 40 interconnects the upper and lower sheets 41, 42. The lower sheet has a generally rectangular opening 43 formed adjacent to the common edge 40 of the upper and lower sheets 41, 42. The opening 43 has opposed first and second edges 431, 432 which are substantially parallel with the common edge 40. As shown, the first edge 431 is adjacent to the common edge 40 while the second edge 432 is distal from the common edge 40. The lower sheet 42 further has a plate member 45 which is connected to the internal face of the lower sheet 42. More specifically, the plate member 45 has a first edge 451 and a second edge 452 which is opposed to the first edge 451. The first edge 451 is inserted into a slit 44 which is located parallelly adjacent to the second edge 432 and is fixedly connected to the lower sheet 42 by means of a high frequency process. The second edge 452 of the plate member 45 extends adjacent to the common edge 40 in order to cover the opening 43, as best illustrated in FIG. 2.

Referring to FIGS. 1 and 2, the C-shaped clamp 50 has upper and lower clamping plates 51, 52 which clamp respectively onto the upper sheet 41 and the plate member 45 through the opening 43, and a curved portion 54. The lower clamping plate 52 has a tapered projection 53 which projects from the distal edge of the lower clamping plate 52 and which abuts the lower face of the plate member 45. The projection 53 has a shoulder portion 531 which faces the curved portion 54. The C-shaped clamp 50 is movable between a clamping position where the curved portion 54 abuts the common edge 40, as best illustrating in FIG. 3, and a releasing position where the shoulder portion 531 of the projection 53 abuts the first edge 431 of the opening 43, as best illustrating in FIG. 4. In the releasing position, the engagement of the projection 53 of the C-shaped clamp 50 and the first edge 431 of the opening 43 prevents the C-shaped clamp 50 from being separated from the upper and lower sheets 41, 42. The lower sheet 42 has two curved slits 433 formed therein, as best illustrated in FIG. 1. Each of the curved slits 433 extends from a respective one of the opposed ends of the first edge 431 of the opening 43 and has a terminating end 434 which is distal from the common edge 40 as compared to the opposed ends of first edge 431. Therefore, the lower sheet 42 can be prevented from being torn along the first edge 431 of the opening 43 when the C-shaped clamp 50 is moved from the clamping position to the releasing position and thereby exerts an impaction force on the first edge 431 of the opening 43.

In use, the C-shaped clamp 50 is moved to the releasing position as shown in FIG. 4. A document 60 is inserted between the upper and lower sheet 41, 42 until an edge of the document 60 reaches near the common edge 40 of the document folder. The C-shaped member 50 is then moved to the clamping position in order to clamp firmly the document 60 between the plate member 45 and the upper sheet 41, as shown in FIG. 3. The document 60 may be withdrawn from the document folder by moving the C-shaped clamp 50 from the clamping position to the releasing position.

The upper clamping plate 51 of the C-shaped clamp 50 has a ramp 511 inclined downwardly from the intermediate portion of the upper face of the upper clamping plate 51 to the distal edge of the upper clamping plate 51 in order to facilitate the grasping of the C-shaped clamp 50 when the C-shaped clamp 50 is moved between the clamping and releasing positions.

It is noted that the plate member 45 is much shorter than the folding portion of the document folder of the prior art. Therefore, the material cost of the document folder of the present invention can be reduced. In addition, since the C-shaped clamp 50 will not be in contact with the terminating ends 434, the opening 43 will not be torn easily along the first edge 431 of the opening 43.

While the present invention has been described in connection with what is considered the most practical and preferred embodiment, it is understood that this invention is not limited to the disclosed embodiment but is intended to cover various arrangements included within the spirit and scope of the broadest interpretations and equivalent arrangement.

Claims

1. A document folder comprising:

upper and lower sheets having a common edge which interconnects said upper and lower sheets, said lower sheet having an opening formed adjacent to said common edge of said upper and lower sheets, said opening having opposed first and second edges which are parallel with said common edge, said first edge of said opening being adjacent to said common edge while said second edge of said opening is distal from said common edge, said lower sheet further having an internal face and a plate member connected to said internal face of said lower sheet, said plate member having a first edge which is fixedly connected adjacent to said second edge of said opening, and a second edge which is opposed to said first edge of said plate member and which extends adjacent to said common edge so as to cover said opening; and

a C-shaped clamp having upper and lower clamping plates clamping respectively onto said upper sheet and said plate member through said opening, and a curved portion which interconnects said upper and lower clamping plates, said lower clamping plate having a distal edge and a tapered projection which projects from said distal edge and abuts said plate member, said projection having a shoulder portion facing said curved portion, said C-shaped clamp being movable between a clamping position, where said curved portion abuts said common edge and a releasing position, where said shoulder portion of said projection abuts said first edge of said opening, preventing said C-shaped clamp from being separated from said upper and lower sheets.

2. A document folder as claimed in claim 1, wherein said first edge of said opening has two ends, said lower sheet having two curved slits formed therein, each of said curved slits extending from a respective one of said ends of said first edge of opening and having a terminating end which is distal from said common edge.

3. A document folder as claimed in claim 1, wherein said upper clamping plate of said C-shaped clamp has an upper face, and a ramp inclined downwardly from an intermediate portion of said upper face to a distal edge of said upper clamping plate.