KR20060112211A - Binder and its fastening member - Google Patents

Abstract

A binder and a combining member thereof are provided to obtain sufficient strength against deformation and breakage and to make the combining member thin by forming two hanging and fitting units at one protruded unit. The combining member(3) for detachably fixing a base plate(21) of a filing tool(2) to the inside of a shelfback(11) is composed of a base member and a plate-shaped slide member(7) installed on the base member. The base member has a protrusion(62) projected to the base plate through the shelfback and the base plate of the filing tool and plural hanging and fitting units installed at the protrusion. The slide member has plural hanging and fitting pieces fitted into each hanging and fitting unit in installing the slide member to the base member. The hanging and fitting piece is formed like a plate and inserted between the filing tool and the hanging and fitting unit.

Description

Binder and its fastening member {BINDER AND ITS FASTENING MEMBER}

1 is a perspective view of a binder including a fastening member according to the first embodiment of the present invention.

2 is an exploded perspective view of the fastening member according to the first embodiment of the present invention.

3 is a perspective view of a fastening member according to the first embodiment of the present invention.

4 is a plan view of a fastening member according to the first embodiment of the present invention.

Fig. 5 is a road showing a state in which attachment and detachment are freely fixed to a cover sheet by a fastening member according to an embodiment of the present invention, (a) is an enlarged cross-sectional view, and (b) is an example in which the shape of the protrusion is different. It is an expanded sectional drawing which shows.

It is a partial perspective view which shows the relationship between the positioning piece of the back surface of the iron tool which concerns on embodiment of this invention, and the removal hole of a back cover.

It is a partial sectional drawing which shows the relationship of the positioning piece of the back surface of the iron tool which concerns on embodiment of this invention, and the removal hole of a back cover.

It is a perspective view of the binder provided with the fastening member which concerns on 2nd Embodiment of this invention.

9 is a road showing a slide member according to a second embodiment of the present invention, (a) is a front view, (b) is a top view, and (c) is a side view.

It is a road which shows the base member which concerns on 2nd Embodiment of this invention, (a) is a front view, (b) is a top view, (c) is a side view.

It is a perspective view of the fastening member which concerns on 2nd Embodiment of this invention.

It is sectional drawing of the fastening member which concerns on 2nd Embodiment of this invention.

It is a perspective view of the binder provided with the fastening member which concerns on 3rd Embodiment of this invention.

It is a top view of the slide member of the fastening member which concerns on 3rd Embodiment of this invention.

It is a perspective view of the fastening member which concerns on 4th Embodiment of this invention.

It is a perspective view of the fastening member which concerns on 4th Embodiment of this invention.

It is a partial sectional drawing of the fastening member which concerns on 4th Embodiment of this invention.

It is a top view of the slide member of the fastening member which concerns on 4th Embodiment of this invention.

  <Explanation of symbols for the main parts of the drawings>

1 cover member

11 cover page

11a takeout hole on back cover

2 ironing tools

21 boards

21a hole

3 fastening member

6 base member

61 fall prevention

62 protrusions

62a slit

63 fasteners

7 slide members

71 Getting Started

71a auxiliary engagement

72 concave

73 Extruded Strips

8 locking means

81 Convex

82 recess

83 support

84 planar notch

Japanese Patent Publication No. 2003-276375

TECHNICAL FIELD This invention relates to the technique of the binder provided with the fastening member which detachably fixes the board | substrate part of the tool for binding to a document etc. on the inner surface side of a shelfback.

In binders, a tool for binding to the inner surface side of the cover sheet of the label member is fixed. As a tool for this ironing, various types of conventionally known ones are known. Among them, in a thick binder capable of binding a large number of documents and the like, for example, a substrate portion, a pair of binding plates disposed on both left and right sides of the substrate portion, and the binding plate The iron tool which has the rod inserted and extended in between is widely employ | adopted.

When fixing the substrate portion of the binding tool to the inner surface side of the cover sheet, a method in which a plurality of holes coincident with each other on the cover sheet and the substrate are drilled, and the cover member is fixed by rivets using the holes. have.

In the fixing method using this rivet, it is difficult to separate both when the tool to be attached to the cover member is fixed once. In general, the label member is a combustible material made of cardboard, a synthetic resin sheet, or the like, and the tool for ironing is a nonflammable material mainly made of metal. Therefore, there has been a problem that it is difficult to cope with the recent waste disposal problem and the separate disposal required from the viewpoint of protecting the natural environment. Moreover, there also existed a problem that the iron with the durability which consists of metals cannot be reused.

The technique which considered this point is described in a patent document (Unexamined-Japanese-Patent No. 2003-276375). The binder of this patent document 1 is equipped with the tool which attaches and detaches freely via the base fastener (fastening member) on the inner surface side of a cover sheet. The base fixture is made entirely of resin, and includes a penetrating member penetrating the back cover and the base, an insertion shaft portion that can be inserted into and drawn out from a hole formed in the penetrating member, and a hook portion provided at an adjacent position of the insertion shaft portion. Equipped. And when the insertion shaft part is inserted into the hole of the penetrating member, the base is fixed to the cover sheet.

However, there is a problem to be solved in the following point of the binder provided with a tool for removing and detaching free iron.

(1) Since the hook portion protruding from the main body of the wedge member, which is a constituent member of the base fixture, is provided at an adjacent position of the insertion shaft portion, and the hook portion is close to the wedge member main body, the resistance of the hook portion is large. In order to bend the hook portion and detach or mount the wedge member from the penetrating member, a large force is required, and in particular, it is difficult to remove it.

(2) Since the outer sides of the two insertion shaft portions are in an open state, the insertion shaft portions are likely to contact the outside during assembly during the production process and when removed from the penetrating member, and deformation and breakage are likely to occur. Deformation and damage can be similarly provided by providing the hook portion outside. In addition, in the structure in which the hook portion is provided in the position adjacent to the insertion shaft portion and the insertion shaft portion, in order to reduce the diameter of the base fixture by reducing the shaft diameter, it is necessary to increase the number of shafts in order to maintain the strength. If it is small, inconveniences such as deformation and breakage are more likely to occur.

Therefore, the object of the present invention is to reduce the thickness of the fastening member corresponding to the conventional base fasteners, to achieve overall thinness, and to provide a robust and excellent function in strength and easy detachable operation, and to use the same. It is to provide the technique of a fastening member.

In order to solve the said subject, the following means were employ | adopted in this invention. The present invention provides a fastening member for freely attaching and detaching a substrate portion of a tool to be attached to an inner surface side of a cover sheet, comprising a base member and a plate-shaped slide member attached to the base member, and the base member having a cover sheet. And projections projecting through the substrate of the tool to be protruded on the substrate, and a plurality of engaging portions respectively provided on both sides of the projecting portion, wherein the slide member is engaged with each engaging portion at the time of mounting to the base member. It has a plurality of engagement pieces.

According to the present invention, the engaging portions are provided on both sides of the projections penetrating the back cover and the substrate, and the plurality of engaging pieces respectively engaged with the engaging portions are provided on the slide member. The whole fastening member can be comprised thinly. In particular, since there are two engagement portions for one projection and at least two corresponding engagement pieces, it becomes possible to maintain the required strength of the engagement pieces as a whole even if the individual engagement pieces are thinned. In addition, the engaging piece has a cross-sectional L-shaped structure, which is more resistant to deformation and breakage than the shaft structure. As a result, the fastening member can be thinned.

In addition, in the present invention, the engaging portion is formed in a substantially T-shaped cross section, and a protruding strip extending in the inserting direction of the engaging piece is formed on the surface of the engaging piece, and the engaging portion allows entry of the protruding strip. It is preferable that a guide groove is formed. When the protruding strip along the longitudinal direction is provided in the engaging piece, both the function of reinforcing the engaging piece itself and the guide function can be exhibited. In addition, by engaging the protruding strip of the engaging piece to the engaging part, it is possible to prevent the moving piece of the engaging member of the slide member from deforming and binding when the excessively loaded paper load is applied. .

Further, the projecting portion may be one provided that the width of the cover sheet is narrow (for example, less than 5 cm), and two engaging pieces corresponding to the engaging portions of the projecting portion are provided in the slide member in this case. When the cover sheet becomes wider (e.g., 5 cm or more), a pair is provided at intervals in the width direction of the cover sheet, and four engaging pieces corresponding to the engaging portions of the protrusions are provided on the slide member. It is preferable that it is done. In this way, in the case of the configuration including four engagement pieces, even if each engagement piece is formed in a thin plate shape, it can be designed to have sufficient strength as a whole.

Between the slide member and the board | substrate, the latching means of the structure containing the convex part provided in the one of the opposing surfaces of a slide member and the board | substrate, and the recessed part provided in the other and to which the convex part is fitted can be provided. In this way, when the uneven fitting is used, not only the locking means can be configured in a simple configuration, but also deformation and breakage are less likely to occur.

Moreover, the support member which can elastically deform is provided in the slide member, and the convex part may be provided in the support piece. Thus, when the convex part is provided in the support piece which can be elastically deformed, the amount of projections of the convex part can be changed by the elastic deformation action of the support piece. Thereby, the function as a locking means can be improved, aiming at the improvement of the operability at the time of attaching or detaching a slide member to a base member.

The present invention provides a binder having a fastening member for detachably fixing a substrate portion of a tool to be attached to an inner surface side of a cover sheet, wherein the fastening member includes a base member and a plate-shaped slide member attached to the base member. The base member includes a release preventing portion disposed on the outer surface side of the cover sheet, a protrusion that penetrates the substrate of the cover sheet and the tool to be protruded onto the substrate, and engaging portions provided on both sides of the protrusion, respectively. Has a plurality of engaging pieces which are respectively engaged with each engaging portion at the time of attachment to the base member.

According to the fastening member of the present invention, not only can the thickness be thinner than the conventional base fixture, but also the overall thickness can be reduced, and since the hook member is not provided, the configuration is simple, excellent in manufacturability, and deformation after molding. The advantage of being small is also obtained.

In this case, the projecting portion may be one as long as the cover sheet is narrow (for example, less than 5 cm), and in this case, two engaging pieces corresponding to the engaging portions of the projecting portion are provided in the slide member. When the width of the cover sheet becomes wider (for example, 5 cm or more), a pair is provided at intervals in the width direction of the cover sheet, and the slide members are provided with four engagement pieces corresponding to the engaging portions of the protrusions. It is preferable.

Moreover, it is preferable that the slide member is provided with the convex part which fits into the recessed part provided in the board | substrate of the tool to be attached at the time of attachment of the slide member to the base member, and positions the slide member to the mounting position. Thus, when the convex part is provided in the slide member, not only the shaping | molding which makes the convex part a necessary protrusion amount is easy, but also the recessed part can be formed by the simple punching process with respect to the board | substrate of a tool to remove. As a result, the locking means can be simplified, the amount of material used is small, and it can be configured in a thin shape.

Moreover, the support member which can elastically deform is provided in the slide member, and the convex part may be provided in the support piece. Thus, when the convex part is provided in the support piece which can be elastically deformed, the amount of projections of the convex part can be changed by the elastic deformation action of the support piece. Thereby, the function as a locking means can be improved, aiming at the improvement of the operability at the time of attaching or detaching a slide member to a base member.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described with reference to drawings. BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the binder provided with the fastening member which concerns on embodiment of this invention. 2 and 3 are perspective views of the fastening member, and FIG. 4 is a plan view thereof. 5 (a) and 5 (b) are enlarged cross-sectional views of a state in which a tool attached to the cover member is detachably attached to a cover sheet.

(1st embodiment)

The binder B of this embodiment is a fastening member made of synthetic resin for freely attaching and detaching a portion of the substrate 21 of the metal ironing tool 2 to the inner surface side of the cover sheet 11 of the labeling member 1. (3) is provided. The label member 1 is formed of cardboard, synthetic resin sheet or the like.

The tool 2 to be attached is disposed on both sides of the substrate 21 fixed to the cover sheet 11 by the fastening member 3 and the left and right portions of the substrate 21 (the width direction of the cover sheet 11). A pair of operation members 22 and 22 which can be extended to the side, and a detachably mounted retractable member 23 extending between both operation members 22 and 22 are provided.

The board | substrate 21 is formed by the process of a metal plate, As shown in FIG.5 (a), the standing part 24, 24 is provided in the left and right both sides of the board | substrate 21. As shown in FIG. Bearings 25 and 25 are provided at the upper ends of the standing portions 24 and 24. A pair of operation members 22 and 22 are hinged to the bearing portions 25 and 25 via hinge pins (not shown).

The member 23 to be unfolded extends from an insertion rod 23b made of a metal rod extending from the support plate 23a attached to one operation member 22 and a support plate 23c attached to the other operation member 22. 23 d of accommodating rods which consist of an existing metal pipe are provided. And when removing or binding a document etc., it is comprised so that the operation | movement member 22, 22 can be opened so that opening member 23 can open | release.

In addition, in the substrate 21 and the cover sheet 11, the flat rectangular hole 21a and the extraction hole 11a which pass through the projection 62 of the base member 6, which will be described later, of the fastening member 3 are coaxial with each other. It is installed. The hole 21a of the board | substrate 21 and the extraction hole 11a of the back cover 11 are spaced in the width direction of the back cover 11, and are spaced in the height direction of the back cover 11, respectively. A pair and 2 pairs (four pieces) in total are provided (refer FIG. 1 and FIG. 5 (a)).

Moreover, as shown in FIG. 6 and FIG. 7, the withdrawal hole 11a of the cover sheet 11 and the hole 21a of the board | substrate 21 are coaxial with each other on the back surface of the board | substrate 21 of the tool 2 of this attachment. A plurality of positioning pieces 21b for regulating the positioning and positioning of the tool 2 to be shifted in the direction orthogonal to the removal direction are provided. In the example of FIG. 6 and FIG. 7, each positioning piece 21b is formed by the cutting piece cut out to the back surface side of the board | substrate 21 from the edge part which opposes the hole 21a of the board | substrate 21. FIG. . The cutting angle of each positioning piece 21b is set to almost 90 degrees with respect to the back surface of the substrate 21. The height of each positioning piece 21b is set not to exceed the thickness of the cover paper 11. The tip of each positioning piece 21b is rounded in the shape of a tongue piece, and is easily inserted into the takeout hole 11a of the cover sheet 11. Four positioning pieces 21b are provided for each hole 21a of the substrate 21, each disposed near four corners of the hole 21a, and the inner edge of the takeout hole 11a of the cover sheet 11 is provided. It is fitted in (see Fig. 7). Thereby, in the state which inserted each positioning piece 21b into the corresponding withdrawal hole 11a of the cover paper 11, the board | substrate 21 is with respect to the cover paper 11, front and back, right and left (width of the cover paper) Direction and height direction), so that positioning does not occur.

The fastening member 3 is equipped with the base member 6 and the plate-shaped slide member 7 attached to the base member 6, as shown to FIG. The base member 6 protrudes from the thin plate-shaped fall prevention part 61 and the fall prevention part 61 arrange | positioned on the outer side of the back cover 11, and penetrates through the back cover 11 'and the board | substrate 21. FIG. And a pair of protrusions 62 and 62 projecting on the substrate 21, and engaging portions 63 and 63 provided on both sides of each of the protrusions 62, respectively. The slide member 7 includes four engagement pieces 71 that are engaged with the respective engagement portions 63 at the time of attachment to the base member 6, and a recess 72 for slide operation. It is installed.

Between the board | substrate 21 and the slide member 7 of the releasing tool 2, it engages with each other at the time of attachment of the slide member 7 to the base member 6, and positions the slide member 7 to its mounting position. A locking means 8 for determining is provided. As this latching means 8, the convex part 81 provided in either one of the opposing surfaces of the slide member 7 or the board | substrate 21, and the recessed part provided in the other, and the convex part 81 fit into it, are fitted. It can be set as the structure containing (82). In this embodiment, the convex part 81 is provided in the slide member 7, and the recessed part 82 is provided in the board | substrate 21, and the locking means 8 is comprised. In this way, the concave-convex fitting not only makes the locking means simpler, but also deforms and breaks less easily than the conventional hook member.

In particular, in the case where the convex portion 81 is provided on the slide member 7, not only the molding which makes the convex portion 81 a necessary amount of protrusion is facilitated, but also the substrate 21 of the tool 2 to be ironed. 1, the recessed part 82 can be formed by a simple punching process. Thereby, even if the locking means 8 is made simple, it can be comprised thin.

Moreover, using the point in which the part of the recessed part 72 provided in the slide member 7 was thinly formed, the support piece 83 which can be elastically deformed is provided in the recessed part 72 part, and the support piece It is good also as a structure which provided the convex part 81 in the 83. The support piece 83 is comprised so that elastic deformation is possible by forming the U-shaped planar notch 84 in the part of the recessed part 72. FIG. Thus, when the convex part 81 is provided in the support piece 83 which can be elastically deformed, the outgoing amount of the convex part 81 can be changed by the elastic deformation action of the support piece 83. Thereby, while improving the operability at the time of attaching or detaching the slide member 7 to the base member 6, the function as a locking means can be improved further.

The locking means may be provided by forming a U-shaped flat notch 84 from the outside of the slide member 7 to the inside in this way. As shown in FIG. The planar notch 84 of the shape of a magnet may be formed and provided. As shown in Fig. 16, the locking means may be provided with a plurality of U-shaped flat notches 84 formed.

In this embodiment, each engaging portion 63 is formed in a substantially T-shaped cross section projecting to both sides of the projecting portion 62, and each engaging piece 71 is engaged with the substrate 21 and engaging portion 63. It is formed in the shape of a thin plate inserted between. Therefore, the space | interval (alpha) of the engaging pieces 71 and 71 adjacent to each other is formed slightly larger than the thickness of the width direction (width direction of the back cover 11) of the protrusion part 62. As shown in FIG.

The engagement piece 71 has a cross-sectional L-shaped structure and is designed to have sufficient strength as a whole.

On the surface of the engaging piece 71, a protruding strip 73 extending in the insertion direction (the longitudinal direction of the engaging piece) of the engaging piece 71 is formed. Correspondingly, a guide groove 64 is formed in the lower surface of the engaging portion 63 to allow the protrusion strip 73 to enter. This is because the engaging piece 71 of the slide member is provided when the reinforcing function of the engaging piece itself and the excessive load by the document are applied by providing the projection strip 73 along the longitudinal direction in the engaging piece 71. It was installed in order to show both the functions of preventing the movement of the tool which deforms and deforms outwards.

In addition, although the above-described function can be exhibited by providing the protruding strip 73 and the guide groove 64, the engaging portion 63 is shown in Fig. 5B from the viewpoint of exhibiting the essential function as the fastening member. The lower surface of the upper surface of the engaging piece 71 may also be formed into a flat surface correspondingly.

In the fall prevention part 61 formed in the plate shape, the pair of wall portions 65 stand up in parallel with the protrusion part 62 toward the engagement part 63, and the periphery of the front end of the wall part 65 is carried out. The base member 6 can be temporarily fixed to the takeout hole 11a of the cover sheet 11 by providing the claw portion 66 by bending the side opposite to the protrusion 62.

Moreover, when the base member 6 is set to the withdrawal hole 11a of a cover on the short side side surface of the protrusion part 62, the position of the up-down direction of the short side of the cover of the base member 6 is regulated. A positioning unit 67 is provided.

In addition, what is necessary is just to carry out the following operation | movement, for example to attach / detach and fix the tool 2 to which the fastening member 3 is attached to the back cover 11 of the label member 1 freely. As shown in FIG. 6, first, each positioning provided in the board | substrate 21 of the tool 2 which binds with respect to the extraction hole 11a provided in the cover paper 11 from the inside of the cover paper 11 is carried out. The piece 2b is inserted into the corresponding extraction hole 11a, and the tool 2 which binds to the cover paper 11 is set. Next, the protrusions 62 of the base member 6 are inserted from the outside of the cover sheet 11 with respect to the withdrawal hole 11a provided in the cover sheet 11 and the hole 21a of the substrate 21. Through it. Finally, both slide members 7 are inserted and mounted respectively (see Fig. 1).

When separating the cover member 1 and the tool 2 to be bound, both of the slide members 7 may be pulled out using the recessed portion 72 of the slide member 7.

(2nd embodiment)

Next, a second embodiment of the present invention will be described with reference to FIGS. 8 to 12. In addition, in this 2nd Embodiment, the same code | symbol is attached | subjected about the component which is basically the same as 1st Embodiment, and the description is simplified.

In this 2nd Embodiment, in the point which changes the cross-sectional shape of the protrusion strip 73 provided in the engaging piece 71 of the slide member 7, and the guide groove 64 of the lower surface of the engaging part 63. There is a characteristic. That is, the protruding strip 73 is partially cut off at the edge of the convex cross section to form a smooth curved surface. The guide groove 64 is also partially cut to form a smooth curved surface so as to correspond to the cross-sectional shape of the protruding strip 73. This shape prevents the movement of the engaging piece 71 of the slide member 7 to deform and derail when the excessive load by the document is applied, and also facilitates molding. In addition, the function as a guide can be improved.

(Third embodiment)

Next, a third embodiment of the present invention will be described with reference to FIGS. 13 and 14. In addition, in this 3rd Embodiment, the same code | symbol is attached | subjected about the component which is basically the same as 1st and 2nd Embodiment, and the description is simplified.

This third embodiment is characterized in that a pair of locking means 8 are provided. That is, by using the thin part of the recessed part 72 provided in the slide member 7, the support piece 83 which can elastically deform to the recessed part 72 part of the recessed part 72 of the recessed part 72 is formed. It is set as the structure which provided the convex part 81 in the lower surface of both support pieces 83, while providing two places in the position close to the left-right (width direction of the cover paper). Both support pieces 83 are also configured to be elastically deformable by forming a U-shaped planar notch 84 in the recessed portion 72. Since two support pieces 83 are provided, two recesses 83 to which the projections 81 are fitted are also provided in the substrate 21 of the tool 2 to be attached. Thus, when the pair of latching means 8 is provided, the function of the latching means 8 will increase by that much.

(4th embodiment)

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 15 to 18. In addition, in this 4th Embodiment, the same code | symbol is attached | subjected about the component which is basically the same as the previous embodiment, and the description is simplified.

This fourth embodiment is characterized in that the engagement area between the engagement portion 63 and the engagement piece 71 is increased. That is, the protrusion part 62 includes the slit 62a provided in the side surface which faces the insertion direction of the engagement piece 71, and slides between the adjacent engagement pieces 71 and 71 of the slide member 7; The auxiliary engaging piece 71a fitted to the slit 62a at the time of attachment of the member 7 to the base member 6 is provided.

The slit 62a may be one place. However, in this embodiment, in consideration of ease of use, one place is provided on the side facing the insertion direction of the engagement piece 71, and one place is provided on the opposite side and two places in total. Thereby, the base member 6 can be penetrated through the hole of a cover sheet, without considering the direction of a slit.

The auxiliary engagement piece 71a is provided in the position which approached to the front side of the insertion direction of the engagement piece 71 so that it may be formed in planar U shape, including the engagement pieces 71 and 71 which adjoin each other. As a result, the strength of the entire engagement piece is increased, the engagement area increases only in the portion where the auxiliary engagement piece 71a is added, and the function as the fastening member is further enhanced.

In addition, although the example which provided a pair of protrusion part 62 in the base member 6 was shown in the above embodiment, you may provide more or just one according to the width | variety of a cover sheet. In one case, it is installed in the center of the fall prevention unit (61). Even if one projection 62 is provided, engagement portions 63 exist on the left and right sides, and two engagement pieces 71 are also present. Thus, sufficient strength can be obtained in this case as well.

ADVANTAGE OF THE INVENTION According to this invention, the binder can be made thin, the thickness of the whole can be reduced, it is strong, can exhibit the outstanding function in strength, and is easy to attach / detach, and the fastening member used for it is obtained.

Claims (5)

As a fastening member for freely attaching and detaching a board | substrate part of a tool to be attached to the inner surface side of a back cover, A base member and a plate-shaped slide member attached to the base member, The base member has a protrusion that penetrates through the substrate of the back cover and the tool to be protruded onto the substrate, and a plurality of engaging portions provided respectively in the protrusion, The slide member has a plurality of engaging pieces which are respectively engaged with the respective engaging portions at the time of attachment to the base member, The fastening member is formed in a plate shape that is inserted between the substrate of the tool to be attached and the fastening portion. The method of claim 1, And a protruding strip extending in the inserting direction of the engaging piece on the surface of the engaging piece, and wherein the engaging portion is formed with a guide groove allowing the entry of the protruding strip. The method of claim 1, A fastening member, between the substrate of the tool to be attached and the slide member, is provided with engaging means which engage with each other when mounting the slide member to the base member and position the slide member to its mounting position. The method of claim 1, The protruding portion includes a slit provided on a side facing the insertion direction of the engaging piece, and between the engaging pieces adjacent to each other is fitted to the slit when the slide member is attached to the base member. A fastening member, wherein an auxiliary engagement piece is provided. A binder comprising a fastening member according to any one of claims 1 to 4 and a tool for attaching and detaching freely fixed to an inner surface side of a cover sheet by the fastening member.

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