Cover body for binding tool

Abstract

To provide a cover body for a binding tool capable of effectively suppressing scattering of a paper sheet or a fall-out of a binding tool caused by an unintentional opening operation of the binding tool.SOLUTION: A cover body 22 for the binding tool attached to a binding tool 1 having a binding ring 2 passed through a binding hole 24 of a paper sheet 23 comprises: a front cover 22a; a back cover 22b; and at least one connection part 30 that connects the front cover 22a and the back cover 22b. The front cover 22a and the back cover 22b have a ring hole 22c for passing the binding ring 2 of the binding tool 1. At least one connection part 30 covers a portion 8 other than the binding ring 2 of the binding tool 1 when the cover body 22 is attached to the binding tool 1. The front cover 22a and the back cover 22b can be folded back to the connection part 30.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cover body for a binder to be attached to a binder for paper sheets such as loose-leaf sheets. [Background technology]

[0002] A known binder for paper sheets such as loose-leaf sheets includes a long, narrow base and multiple binding rings connected to the base, and the binding rings are inserted through holes in the paper sheets to bind the paper sheets. Each binding ring generally consists of a pair of half rings, and the binding ring is closed when the tips (opening and closing ends) of the half rings are brought into contact with each other, and is opened when the tips are separated.

[0003] In such a binding device, if the binding rings are unintentionally opened, there is a risk that the paper sheets will come loose from the binding device and scatter. Techniques to prevent this include providing a locking mechanism for each binding ring that engages and disengages the tips of a pair of half-ring portions, or adding a separate locking mechanism to the binding device. However, if a locking mechanism is provided for each binding ring, it is not possible to open and close each binding ring simultaneously, making the operation of opening the binding rings particularly cumbersome. Furthermore, adding a separate locking mechanism is problematic in terms of cost.

[0004] Another type of binding device will be described with reference to FIGS. 8 and 9. The binding device 1 includes a pair of half-ring portions 2A and 2B constituting a binding ring 2, two base portions 3 that are adjacent to each other and long in the axial direction (longitudinal direction) to which the pair of half-ring portions 2A and 2B are connected, a bearing portion 4 provided on each base portion 3, a shaft portion 5 disposed inside the bearing portion 4 of each base portion 3 and connecting the two base portions 3 to each other, a shaft holding portion 6 to which both axial ends of the shaft portion 5 are fixed, and a grip portion 7 provided on the axially outer end of the shaft holding portion 6 that can be grasped by a user. In the binding device 1, a user can grasp the grip portion 7 to relatively displace the base portion 3 along the axial direction and rotate the base portion 3 around the shaft portion 6, thereby simultaneously opening and closing all of the binding rings 2 connected to the base portion 3 in accordance with the relative and rotational displacements. FIG. 8 shows the binding device 1 in a closed state, and FIG. 9 shows the binding device 1 in an open state. The configuration of this binding device 1 is substantially as disclosed in Japanese Patent Application Laid-Open No. 2018-1562 and Japanese Patent Application Laid-Open No. 2020-6539. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-1562 [Patent Document 2] Japanese Patent Application Publication No. 2020-6539 Summary of the Invention [Problem to be solved by the invention]

[0006] The above-described binding device 1 has the advantage that all binding rings 2 can be opened and closed simultaneously with a simple operation and is not expensive. However, when a file containing paper sheets bound in the binding device 1 is dropped and receives an impact, an unintentional relative displacement in the longitudinal direction of the base 3 may occur, causing all binding rings 2 to open simultaneously. In this case, there is a risk that the paper sheets may come off the binding device 1 and fly away, or that the binding device 1 may fall off and be lost.

[0007] The object of this invention is to solve the problems described above, and its purpose is to provide a cover body for a binding device that can effectively prevent paper sheets from flying off or the binding device from falling off due to unintended opening of the binding device. [Means for solving the problem]

[0008] The cover body for a binding device of this invention is a cover body to be attached to a binding device having binding rings to be passed through binding holes in paper sheets, and comprises a front cover, a back cover, and at least one connecting portion that connects the front cover and the back cover, the front cover and the back cover having ring holes for passing the binding rings of the binding device, the at least one connecting portion covering a part of the binding device other than the binding rings when the cover body is attached to the binding device, and the front cover and the back cover can be folded back around the connecting portion.

[0009] The cover body for a binding device of the present invention can have hinge portions at the boundaries between the front cover and the back cover and the connecting portion, respectively, that allow the front cover and the back cover to rotate relative to the connecting portion.

[0010] The edges of the front cover and the back cover near the ring holes may protrude laterally inward beyond the boundaries between the front cover and the back cover and the connecting portion when the front cover, the back cover, and the connecting portion are unfolded in a flat state.

[0011] The ring holes are preferably elongated holes that are long in the lateral direction of the front and back covers, and the elongated holes that are ring holes can include two arcs with different diameters.

[0012] The connecting portion has a front connecting portion that connects to the front cover, a back connecting portion that connects to the back cover, and a spine that connects the front connecting portion and the back connecting portion, and the spine may be close to or in contact with the part other than the binding ring of the binding device. [Effects of the Invention]

[0013] In the cover body for the binding device of this invention, the connecting portion covers a part of the binding device other than the binding ring, so this part is constrained within the connecting portion and free displacement is suppressed. As a result, the binding device can be easily kept in a center position where the opening and closing ends of the binding ring are hidden by the group of paper sheets between the front cover and the back cover and are not exposed to the outside, and it is possible to effectively suppress scattering of paper sheets and falling off of the binding device due to unintentional opening of the binding device. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing a file in which a binding device is applied to a cover body for a binding device according to a first embodiment of the present invention. [Figure 2] 2 is a perspective view showing the file of FIG. 1 with the front and back covers of the binder cover body folded back. FIG. [Figure 3] 2 is a plan view showing the file of FIG. 1 with the front and back covers open. FIG. [Figure 4] 2 is a perspective view of the file of FIG. 1 as seen from the direction of arrow A. [Figure 5] FIG. 5 is an enlarged view of the enclosure C1 of FIG. [Figure 6] 1 is a plan view showing the front and back covers and connecting portions of the cover body for a binding device unfolded in a plane. FIG. [Figure 7] FIG. 7 is an enlarged view of the enclosure C2 in FIG. 6. [Figure 8] 1 is a perspective view showing a binding device to which a binding device cover body according to the present invention is applied, with binding rings in a closed state. [Figure 9] 9 is a perspective view showing the binding device of FIG. 8 with the binding rings open. [Figure 10] 10 is a view of a file in which a binding device is applied to a cover body for a binding device according to a second embodiment of the present invention, as viewed from the front cover side. FIG. [Figure 11] 10 is a view of a file in which a binding device is applied to a cover body for a binding device according to a third embodiment of the present invention, as viewed from the front cover side. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 4 illustrate a file 21 including a cover body for a binding device (hereinafter simply referred to as a "cover body") 22 according to a first embodiment of the present invention. The file 21 includes the cover body 22 and a binding device 1 to which the cover body 22 is attached. The file 21 may further include paper sheets 23 such as loose-leaf paper. The binding device 1 is an example of a binding device that can be suitably combined with the cover body 22, and has a plurality of binding rings 2 that are passed through binding holes 24 of the paper sheets 23. Binding devices that can be suitably combined with the cover body 22 are disclosed in Japanese Patent Application Laid-Open Nos. 2018-1562 and 2020-6539.

[0016] The cover body 22 includes a front cover 22a arranged on the front side of the file 21, a back cover 22b arranged on the back side of the file 21, and one or more connecting portions 30 that connect the front cover 22a and the back cover 22b. As an example, the cover body 22 of the first embodiment has four connecting portions 30. One or more paper sheets 23 are bound into the binder 1 by passing the binding rings 2 through the binding holes 24, and are sandwiched between the front cover 22a and the back cover 22b of the cover body 22.

[0017] The horizontal directions (inner and outer horizontal directions) and vertical directions of the file 21 and cover body 22 are as shown in Figures 1 and 6, and the illustrated front cover 22a and back cover 22b are longer vertically than horizontally. As an example, two binding devices 1 are applied to the inner horizontal sides of the file 21. As an example, each binding device 1 has five binding rings 2. These two binding devices 1 are arranged on both ends with a gap between them in the vertical direction. The four connecting portions 30 consist of two connecting portions 30 provided on one binding device 1 at one vertical end, and two connecting portions 30 provided on the other binding device 1 at the other vertical end.

[0018] The front cover 22a and the back cover 22b have multiple ring holes 22c through which the binding rings 2 of the binding device 1 pass. In the example shown in FIG. 1 etc., five ring holes 22c are provided on each of the front cover 22a and the back cover 22b at both ends of the vertical direction on the horizontally inner side. Two connecting portions 30 are provided on each cover so as to sandwich the area where the five ring holes 22c and the binding rings 2 to be passed through them are located in the vertical direction. The number of ring holes 22c may be equal to or greater than the number of binding rings 2, as long as all binding rings 2 of the binding device 1 can be passed through the ring holes 22c of the front cover 22a and the back cover 22b. The cover body 22 is attached to the binding device 1 by passing the binding rings 2 of each binding device 1 through the ring holes 22c of the front cover 22a and the back cover 22b. The connecting portions 30 are formed so as to cover a portion of the binding device 1 other than the binding rings 2 (the protruding portions 8 outside the ring area, described later) when the cover body 22 is attached to the binding device 1. This point will be explained next.

[0019] Hereinafter, with respect to the binding device 1, the direction in which the binding rings 2 are lined up or the longitudinal direction of the base 3 will be referred to as the axial direction. Referring to FIGS. 8 and 9, the binding device 1 includes a pair of half-ring portions 2A and 2B constituting the binding ring 2, two base portions 3 that are adjacent to each other and long in the axial direction and to which the pair of half-ring portions 2A and 2B are connected, a bearing portion 4 provided on each base portion 3, a shaft portion 5 that is disposed inside the bearing portion 4 of each base portion 3 and connects the two base portions 3 to each other, a shaft holding portion 6 to which both axial ends of the shaft portion 5 are fixed, and a grip portion 7 that is provided on the axial outer end of the shaft holding portion 6 and that is gripped by a user. With the binding device 1, a user can grip the grip portion 7 to relatively displace the base portion 3 along the axial direction and pivotally displace the base 3 around the shaft 6, thereby simultaneously opening and closing all of the binding rings 2 connected to the base 3 in accordance with the relative and pivotal displacements. Although each binder 1 of the file 21 in FIG. 1 etc. has five binding rings 2, the number of binding rings 2 of the binder 1 in FIGS. 8 and 9 is shown as four for the sake of convenience.

[0020] 8 and 9, it can be seen that both axial ends of the base 3 of the binding device 1, the shaft holding portion 6, and the gripping portion 7 protrude axially outward from the area where the binding rings 2 are arranged. Hereinafter, both axial ends of the base 3, the shaft holding portion 6, and the gripping portion 7, which are the portions protruding axially outward from the area where the rings are arranged, will be referred to as "ring area outside protrusions 8." Each connecting portion 30 of the cover body 22 is formed so as to cover the ring area outside protrusions 8 when attached to the binding device 1. As a result, even if the binding rings 2 of the binding device 1 are unintentionally opened, the ring area outside protrusions 8 of the binding device 1 will get caught on the connecting portions 30, and the binding device 1 will not easily fall off.

[0021] As can be seen from the enlarged view of FIG. 5 , connecting portion 30 has a front connecting portion 31 that connects to front cover 22a, a back connecting portion 32 that connects to back cover 22b, and a spine 33 that connects front connecting portion 31 and back connecting portion 32. Front cover 22a is formed so that it can be folded back about front connecting portion 31. Back cover 22b is also formed so that it can be folded back about back connecting portion 32. For this reason, hinge portions 34 are provided at the boundary between front cover 22a and front connecting portion 31 and at the boundary between back cover 22b and back connecting portion 32. Hinge portions 34 will be described later. In addition to hinge portions 34, connecting portion 30 can also be made from a soft material such as elastomer or rubber to make front cover 22a and back cover 22b foldable or rotatable about connecting portion 30.

[0022] The front connecting portion 31, the back connecting portion 32, and the spine 33 are generally U-shaped in side view (see FIG. 5) when the file 21 is closed, but they can also be generally U- or V-shaped. In FIGS. 4 and 5, the binding device 1 is located at a center position, midway between the left and right sides of the cover body 22 when the group of paper sheets 23 is closed. At this center position, the opening and closing ends 2b of the half-ring portions 2A and 2B of the binding ring 2 are hidden by the group of paper sheets 23 between the front cover 22a and the back cover 22b and are not exposed to the outside. To prevent the binding ring 2 of the binding device 1 from unintentionally opening, it is desirable to first maintain the binding device 1 in a center position. The connecting portion 30 of the cover body 22, the protruding edge 22d (described later, see FIG. 7, etc.), and the like function to maintain the binding device 1 in a center position. The spine 33 of the connecting portion 30 is in proximity to or in contact with the ring area outside protrusion 8 of the binding device 1. 7, the front connecting portion 31 and the back connecting portion 32 are connected to the spine 33 while the distance therebetween gradually narrows from the front cover 22a and the back cover 22b, and the front connecting portion 31 and the back connecting portion 32 are also close to or in contact with the ring area outside protrusion 8. As a result, the ring area outside protrusion 8 of the binding device 1 is constrained within the connecting portion 30, suppressing free displacement. In particular, when the binding rings 2 are in the center position, the ring area outside protrusion 8 is suppressed from displacing in the vertical direction in FIGS. 4 and 5 by the spine 33. Therefore, the binding device 1 is more likely to be maintained in the center position. When the binding device 1 is in the center position, even if the binding rings 2 of the binding device 1 unintentionally attempt to open and displace, this is likely to be prevented, or the displacement will be so slight that it will not result in the paper sheets 23 being released. Furthermore, the binding device 1 is held to the cover body 22 by the connecting portion 30, effectively suppressing it from falling out of the file 21.

[0023] 2, when the front cover 22a and back cover 22b are folded back, the area where the connecting portion 30 of the file 21 is provided can become thicker because the connecting portion 30 is sandwiched between the front cover 22a or back cover 22b and the base 3 of the binding device 1. This may slightly impair the ease of folding back the front cover 22a and back cover 22b. To address this, although not shown, it is possible to provide an escape space for the connecting portion 30 by, for example, cutting out a portion of the base 3 at the ring area outside protrusion 8 of the binding device 1.

[0024] FIG. 6 is a development view of the cover body 22, and is a plan view of the sides of the front cover 22a and the back cover 22b facing the paper sheets 23. FIG. 7 is an enlarged view of the enclosure C2 in FIG. 6. Referring to FIG. 7, hinge portions 34 are formed at the boundaries between the front cover 22a and the back cover 22b and the connecting portion 30. The hinge portions 34 allow the front cover 22a and the back cover 22b to rotate approximately 360 degrees relative to the connecting portion 30. The file 21 shown in FIG. 2 is in a state in which the front cover 22a and the back cover 22b shown in FIG. 1 have been rotated approximately 180 degrees around the hinge portions 34, so that the front cover 22a and the back cover 22b are directly stacked on top of each other. The file 21 shown in FIG. 3 is in an open state in which the front cover 22a and the back cover 22b shown in FIG. 1 have been rotated approximately 90 degrees around the hinge portions 34. Hinge portion 34 can be formed, for example, by partially cutting out the sheet material forming cover body 22 or by partially thinning the thickness of the sheet material. Alternatively, hinge portion 34 can be formed by connecting the sheet material forming front cover 22a and back cover 22b to the sheet material forming connecting portion 30 with a soft material such as elastomer or rubber. Referring to FIG. 7, folds 35 are provided at the boundaries between front connecting portion 31 and back connecting portion 32 and spine 33. Folds 35 can also be formed by partially cutting out the sheet material forming cover body 22 or by partially thinning the thickness of the sheet material.

[0025] Next, the portion of the cover body 22 shown in enclosure C2 in FIG. 6 and FIG. 7 (the upper vertical portion) will be described, but this also applies to the lower vertical portion of the cover body 22. Five ring holes 22c corresponding to one binding device 1 are provided in the upper vertical portion on the inner horizontal portion of each of the front cover 22a and the back cover 22b. Referring to FIG. 7, the area where the five ring holes 22c are lined up vertically (the ring hole alignment area) on each of the front cover 22a and the back cover 22b is located between the two vertically upper and lower connecting portions 30. The edges 22d near the ring hole alignment areas on each of the front cover 22a and the back cover 22b protrude slightly laterally inward (see FIG. 6) beyond the hinge portion 34, i.e., the boundary between the front cover 22a and the back cover 22b and the connecting portion 30. These protruding edges will be referred to hereinafter as "protruding edges 22d." Referring to Figure 7, there is an area without ring holes 22c between the upper and lower ring hole array areas in the vertical direction, and the edge 22e of each of the front cover 22a and the back cover 22b in this area is located at substantially the same position as the hinge portion 34 in the horizontal direction. That is, the protruding edge 22d protrudes slightly inward in the horizontal direction from the edge 22e. By providing such a protruding edge 22d, the strength of the ring holes 22c can be ensured. In addition, the protruding edge 22d is likely to interfere with and come into contact with the binding ring 2 of the binding device 1, particularly the portion of the binding ring 2 on the base 3 side, which can prevent the binding device 1 from shifting from the center position or the binding ring 2 from accidentally opening.

[0026] Referring to Figure 7 and other figures, the ring holes 22c of the cover body 22 are preferably elongated holes, such as ovals or ellipses, that are elongated in the horizontal direction. This prevents the opening and closing of the front cover 22a and the back cover 22b from being hindered by the binding ring 2 of the binding device 1, whose ring area outer protrusion 8 is held by the connecting portion 30. Each ring hole 22c includes an arc 22cb with a relatively small diameter on the inner side in the horizontal direction and an arc 22ca with a larger diameter than the arc 22cb on the outer side in the horizontal direction. Reference numerals 22ca and 22cb are assigned to only one ring hole 22c in Figure 7. In other words, the shape of each ring hole 22c is composed of an arc 22ca, an arc 22cb, and two lines connecting both ends of the arc 22ca and both ends of the arc 22cb. One type of binding ring 2 of the binding device 1 has a shape in which the opening and closing end 2b side is thicker than the base end side of the half-ring portions 2A and 2B. In the case of this type of binding ring 2, if the ring hole 22c is formed to fit the thickest part of the binding ring 2 in order to allow this thickest part to pass through smoothly, the lateral inner edge of the ring hole 22c may come too close to the protruding edge 22d, which may reduce the strength. By forming the ring hole 22c to include arcs 22ca and arcs 22ca of different diameters, it is possible to accommodate a binding device 1 having a binding ring 2 with a thicker opening and closing end 2b side, and the strength of the lateral inner edge of the ring hole 22c can be maintained. Note that the ring hole 22c may be substantially circular, polygonal, or the like.

[0027] When attaching the cover body 22 to the binding device 1, both axial protrusions 8 outside the ring area of ​​the binding device 1 are inserted into the connecting portion 30, and the open binding ring 2 is passed through the ring holes 22c of the front cover 22a and the back cover 22b, and then the binding ring 2 is closed. At this time, depending on the position of the hinge portion 34, it may be difficult to pass the binding ring 2 through the ring holes 22c. In such a case, for example, by providing a notch 36 (see FIG. 7 ) extending laterally inward from the ring hole 22c, the ring hole 22c can be flexed and deformed from the notch 36 when the binding ring 2 is passed through, making it easier to attach the binding ring 2. Note that while FIG. 7 illustrates only one ring hole 22c, the notch 36 can be provided in all or a plurality of ring holes 22c of the cover body 22, or in all or a plurality of ring holes 22c of the back cover 22b. Of course, the notch 36 is not necessary.

[0028] The cover body 22 can be manufactured, for example, by punching out a sheet material in the unfolded state shown in FIG. 6 . The hinge portion 34, fold lines 35, protruding edge 22d, etc. can be formed simultaneously with this punching. Examples of materials for the cover body 22 include, but are not limited to, synthetic resins such as polypropylene, cardboard, etc. Alternatively, a connecting portion 30 can be welded between the front cover 22a and the back cover 22b. In this case, the connecting portion 30 can be made of a different material from the front cover 22a and the back cover 22b, such as a soft material such as elastomer or rubber.

[0029] While the cover body 22 according to the first embodiment has four connecting portions 30, the present invention is not limited thereto and the number of connecting portions 30 may be one to three, or five or more. FIG. 10 shows a file 21A including a cover body 22A according to a second embodiment of the present invention. The binding device 1 of the file 21A is substantially the same as the binding device 1 of the file 21 according to the first embodiment, and two binding devices 1 are also applied to the file 21A. The difference between the cover body 22A and the cover body 22 is that the cover body 22A has three connecting portions 30, 30A. The cover body 22A and the cover body 22 are substantially the same in other respects, so the same reference numerals are used for common parts. The cover body 22A has two connecting portions 30 provided at both vertical ends (top and bottom) on the horizontally inner side, and a middle connecting portion 30A extending across the entire area between the binding devices 1 attached to both vertical sides. Each connecting portion 30 at both ends in the vertical direction covers one of the ring area outside protrusions 8 of the binding device 1 (see FIG. 8, etc.) as in the first embodiment. In contrast, the connecting portion 30A covers the other ring area outside protrusion 8 of the binding device 1 located vertically above and the other ring area outside protrusion 8 of the binding device 1 located vertically below. Hinge portions 34 are provided at the boundaries between the connecting portion 30 and the front cover 22a and the back cover 22b. Note that, for example, the cover body 22A may be formed to have only one connecting portion 30A. Like the connecting portion 30, the connecting portion 30A also has a front connecting portion, a back connecting portion, and a spine.

[0030] The cover bodies 22, 22A according to the first and second embodiments are attached to two binding devices 1, and the protruding portions 8 outside the ring area of ​​each binding device 1 are covered by the connecting portions 30, 30A. However, the present invention is not limited to this. The cover bodies 22, 22A may be attached to a different type of binding device, and the connecting portions may cover portions other than the protruding portions 8 outside the ring area of ​​the binding device. FIG. 11 shows a file 21B including a cover body 22B according to a third embodiment of the present invention. The file 21B includes two binding devices 1B, and cover bodies 22B are attached to these binding devices 1B. The binding devices 1B are attached vertically above and below the cover body 22B. Each binding device 1B includes, for example, three binding rings 2C. The mechanism for opening and closing the binding device 1B is substantially the same as that of the binding device 1, as described in Patent Documents 1 and 2. The cover body 22B has four connecting portions 30B, two of which are provided for one binding device 1B, and the remaining two connecting portions 30B are provided for the other binding device 1B. Each connecting portion 30B of the cover body 22B is formed so as to cover the portion between two axially adjacent binding rings 2C of the binding device 1B. Like the connecting portion 30, the connecting portion 30B also has a front connecting portion, a back connecting portion, and a spine. [Explanation of symbols]

[0031] 1, 1B binding device 2, 2C binding ring 2A, 2B half ring part 2b Opening and closing ends of the half ring 3 base 4 Bearing section 5 Shaft section 6 Shaft holder 7 Gripping part 8. Protrusion outside the ring area 21, 21A, 21B files 22, 22A, 22B cover 22a Front cover 22b back cover 22c ring hole 22d protruding edge 23 Paper 24 binding holes 30, 30A, 30B connection part 31 Table connection part 32 Back connection part 33 Back 34 Hinge part 35 creases

Claims

1. A cover body to be attached to a binding device having binding rings that are passed through binding holes in paper sheets, a front cover, a back cover, and at least one connecting portion connecting the front cover and the back cover; The front cover and the back cover have ring holes for passing the binding rings of the binding device, the at least one connecting portion covers a part of the binding tool other than the binding ring when the cover body is attached to the binding tool; The cover body for a binding device is characterized in that the front cover and the back cover can be folded back at the connecting portion.

2. 2. A cover body for a binding device according to claim 1, further comprising hinge portions at boundaries between the front cover and the back cover and the connecting portion, the hinge portions enabling the front cover and the back cover to rotate relative to the connecting portion.

3. 3. A cover body for a binding device according to claim 1 or 2, wherein the edges of the front cover and the back cover near the ring holes protrude laterally inward beyond the boundaries between the front cover and the back cover and the connecting portion when the front cover, the back cover, and the connecting portion are unfolded in a flat state.

4. 3. A cover body for a binding device according to claim 1, wherein the ring holes are elongated holes that are long in the horizontal direction of the front and back covers.

5. The connecting portion has a front connecting portion that connects to the front cover, a back connecting portion that connects to the back cover, and a spine that connects the front connecting portion and the back connecting portion, and the spine is in close proximity to or in contact with the part other than the binding ring of the binding device.

6. 5. The cover body for a binding device according to claim 4, wherein the elongated hole that is the ring hole includes two arcs with different diameters.

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