Binding tools and folders

Abstract

[Problem] To provide a binding device that can properly maintain the open position of the binding rings. [Solution] The binding device is configured to be in a closed position where the front ends of the first and second ring components (d1(r), e1(r)) can engage with each other, and in an open position where the front ends of the first and second ring components (d1(r), e1(r)) can separate. The first binding device member (D) has a base portion (d2) which has a through hole (M) extending vertically, and the second binding device member (E) has a protrusion (t) which, at an intermediate position (U) during the change of position from the closed position to the open position, can temporarily expand the separation width (w8) of the left and right intermediate wall portions (6, 7) forming the through hole (M).

Description

Binders and folders The present invention relates to a binder and a file folder. In the past, a binding tool has been known, which includes: a first binding tool component provided with a first ring constituting part, and a second binding tool component provided with a second ring constituting part, and is configured to adopt a closed posture in which the front end portions of the first and second ring constituting parts are engaged with each other and an open posture in which the front end portions of the first and second ring constituting parts are separated (for example, refer to patent document 1). Conventional binders have a structure that cannot stably maintain an open position. Therefore, conventional binders sometimes cause trouble for users when binding objects such as paper sheets. [Prior Art] [Patent] [Patent Document 1] Japanese Patent No. 6681742 [Problems to be solved by the invention] The present invention has been made in view of the above-mentioned situation, and its object is to provide a binding tool that can at least appropriately maintain the open position of the binding rings, and a file folder equipped with the binding tool. [Means for Solving the Problem] That is, the present invention has the following structure. The invention described in claim 1 is a binding tool comprising: a first binding tool component provided with a first ring constituting portion, and a second binding tool component provided with a second ring constituting portion, and the binding tool is configured to be able to adopt a closed posture in which the front end portions of the first and second ring constituting portions are engaged with each other and an open posture in which the front end portions of the first and second ring constituting portions are separated, and is characterized in that: the first binding tool component has a base portion, which is provided with a through hole penetrating in the up-down direction or a recessed portion open in the upward direction, and the second binding tool component has a convex portion that can temporarily expand the separation width of the paired wall portions forming the through hole or the recessed portion during the process of changing the posture from the closed posture to the open posture. The invention described in claim 2 is the binding tool described in claim 1, wherein the second binding tool component comprises: a shaft portion, which is rotatably supported relative to the base portion; and the second ring-forming portion integrally extending from the shaft portion, and the protrusion is provided on the shaft portion. The invention described in claim 3 is the binding tool described in claim 2, wherein the base portion comprises: a pair of shaft support portions capable of rotatably supporting the two end portions of the shaft portion, and the through hole or the recess provided between the pair of shaft support portions. The invention described in claim 4 is the binder described in claim 1, wherein the first binder member and the second binder member are each formed of a synthetic resin. The invention described in claim 5 is a file folder comprising a cover and the binding tool described in any one of claims 1 to 4 attached to the cover. The invention described in claim 6 is the file folder described in claim 5, wherein the cover comprises a front cover, a bottom cover, and a side cover, and the first binding member is mounted on the inner side of the side cover using a mounting tool. The invention described in claim 7 is the file folder described in claim 6, wherein the mounting device comprises: a mounting base located on the outer side of the side cover; and an engaging protrusion protruding from the mounting base, penetrating the side cover, and engaging with an engaging portion formed on the base. [Effect of the Invention] As described above, according to the present invention, it is possible to provide at least a binding tool capable of appropriately maintaining the open posture of binding rings, and a file folder including the binding tool. 1 to 16 , an embodiment of the present invention will be described. In this embodiment, the vertical direction, the horizontal direction, and the front-rear direction are defined for ease of description. In this embodiment, the present invention is applied to a binding tool B capable of binding objects J (hereinafter simply referred to as "bound objects J") such as sheets having binding holes j1, and a file folder having the binding tool B. The file folder comprises a cover A and two binding tools B attached to the inner surface of a side cover 3 of the cover A. The two binding tools B have the same structure. The two binding tools B are attached to the front end (front end) and the inner end (rear end) of the side cover 3 using a mounting tool G in a manner that allows them to be separated from each other. The following describes the folder structures in detail. <<Cover A>> The cover A includes a front cover 1, side covers 3, and a bottom cover 2 that are connected to each other so as to be relatively rotatable via a hinge portion N. The cover A is in the form of a sheet formed of synthetic resin. The cover A is constructed so as to be capable of changing its posture to: an open posture (H) in which the front cover 1, the side covers 3, and the bottom cover 2 can be unfolded in roughly the same plane on a loading surface such as a top plate; a closed posture (T) in which the inner surfaces of the front cover 1 and the bottom cover 2 can face each other; and a folded posture (K) in which the outer surfaces of the front cover 1 and the bottom cover 2 can face each other. <Front Cover 1> The front cover 1 is generally rectangular and includes a base front cover portion 12 adjacent to the side cover 3 via a hinge portion N, and a front cover body portion 11 connected to the base front cover portion 12 via an intermediate hinge portion cn. In this embodiment, the front cover 1 is composed of a front cover body 11, an intermediate hinge portion cn, and a base front cover portion 12. Specifically, the front cover 1 is provided with the intermediate hinge portion cn. Therefore, the front cover 1 in the closed position (T) can be flexibly adjusted in relation to the amount, number, and size of the objects J to be bound by the binder B, allowing the relative position of the front cover body 11 and the base front cover portion 12 to be changed. The base end front cover portion 12 is set to be substantially the same as or shorter than the horizontal width w1 of the side cover 3. In this embodiment, the base end front cover portion 12 is set to be shorter than the horizontal width w1 of the side cover 3. The front cover body portion 11 is the main portion constituting the front cover 1. The front cover 1 has a first communicating hole a1 that allows the front and rear binding rings R(f) and R(r) of the binding tool B to pass through, thereby enabling the binding tool B to change between an open position (H) and a closed position (T). The first communicating hole a1 forms the left portion of the front and rear binding rings R(f) and R(r), that is, the front and rear second ring components e1(f) and e1(r) to pass through. Furthermore, the first communicating hole a1 corresponds to the movable region of the front and rear second ring-forming portions e1(f) and e1(r) that are movable about the shaft portion e2, and is provided not only in the front cover body portion 11 and the base front cover portion 12 that constitute the front cover 1, but also across the side cover 3. A left-right dimension w4 of the first communicating hole a1 is set to be longer than a left-right dimension w5 of the second communicating hole a2, described later. <Bottom Cover 2> The bottom cover 2 is generally rectangular and includes a base bottom cover portion 22 adjacent to the side cover 3 via a hinge portion N, and a bottom cover body portion 21 connected to the base front cover portion 22 via an intermediate hinge portion cn. In this embodiment, the bottom cover 2 is composed of a bottom cover body 21, an intermediate hinge portion cn, and a base bottom cover portion 22. Specifically, the bottom cover 2 is provided with an intermediate hinge portion cn. Therefore, when the bottom cover 2 is in the closed position (T), the relative position of the bottom cover body 21 and the base bottom cover portion 22 can be flexibly changed depending on the amount, number, and size of the objects J to be bound by the binder B. The base end bottom cover portion 22 is set to have a width that is substantially the same as or shorter than the width w1 of the side cover 3. In this embodiment, the base end bottom cover portion 22 is set to have a width that is shorter than the width w1 of the side cover 3. The bottom cover body portion 21 is the main portion of the bottom cover 2. The bottom cover 2 has a second communicating hole a2 that allows the front and rear binding rings R(f) and R(r) of the binding tool B to pass through, thereby enabling the binding tool B to change between the open position (H) and the closed position (T). The second communicating hole a2 allows the right portions of the front and rear binding rings R(f) and R(r), that is, the front and rear first ring components d1(f) and d1(r), to pass through. The second communication hole a2 is formed across the bottom cover body 21 and the base bottom cover 22 of the bottom cover 2. The left-right dimension w5 of the second communication hole a2 is set shorter than the left-right dimension w4 of the first communication hole a1. <Side Cover 3> The side cover 3 is provided between the front cover 1 and the bottom cover 2. The horizontal width w1 of the side cover 3 is set to be longer than the horizontal width w2 of the base portion d2 constituting the binding device B, and is set to be shorter than the horizontal width w3 of the front and rear binding rings R(f) and R(r) forming the closed position (C). The binding tools B are separately attached to the front end (the end directly in front) and the rear end (the end in the back) of the side cover 3. That is, the file folder has two binding tools B separated in the front-to-back direction relative to the side cover 3. The side cover 3 is provided with through-holes 31 through which the engaging protrusions g2 of the attachment tools G for attaching the binding tools B pass. <Hinge N, Intermediate Hinge CN> The hinge N and the intermediate hinge CN are referred to as resin hinges. Specifically, the hinge N and the intermediate hinge CN are formed to be thinner than the front cover body 11, the base front cover 12, the side cover 3, the bottom cover body 21, and the base bottom cover 22, thereby making them easily deformable. In addition, the front cover 1 and the bottom cover 2 may also be structures without the middle hinge portion cn. <<Binding tool B>> Binding tool B comprises: front and rear binding rings (R(f)), (R(r)), which are configured to be able to adopt an open posture (P) and a closed posture (C); and a single base portion d2 mounted on the inner surface of the side cover 3, which is arranged on the base end side of the front and rear binding rings R(f), R(r). The binding tool B has: a first binding tool component D, which is provided with front and rear first ring constituting parts d1(f), d1(r) constituting the front and rear binding rings R(f), R(r); and a second binding tool component E, which is provided with front and rear second ring constituting parts e1(f), e1(r) constituting the front and rear binding rings R(f), R(r). The binding tool B is configured to be capable of adopting a closed posture (C) in which the front end portions of the first and second ring components d1(f), d1(r), e1(f), and e1(r) at the front and rear ends are engaged with each other, and an open posture (P) in which the front end portions of the first and second ring components d1(f), d1(r), e1(f), and e1(r) at the front and rear ends are separated. More specifically, the binder B constitutes a second binder component E that can rotate relative to the first binder component D, thereby being able to adopt a closed posture (C) in which the front and rear binding rings R(f) and R(r) form a closed loop and an open posture (P) in which the front and rear binding rings R(f) and R(r) do not form a closed loop. <First Binding Member D> The first binding member D is integrally formed of synthetic resin and is attached to the inner surface of the side cover 3 using an attachment G. The first binding member D comprises a base portion d2 having a shaft portion e2 to which the second binding member E is attached, and a shaft portion receiving space sp open at least downwardly; and front and rear first ring-forming portions d1(f) and d1(r) extending integrally from the base portion d2 and forming the front and rear binding rings R(f) and R(r). The shaft portion receiving space sp of the base portion d2 is located in the longitudinal center (front-back center) of the base portion d2. [Base portion d2] The base portion d2 includes: front and rear engaging holes 4f and 4r provided at both ends in the longitudinal direction and serving as engaging portions capable of engaging with the engaging protrusion g2 of the mounting device G; a pair of front and rear shaft support portions 5f and 5r capable of rotatably supporting both ends of the shaft portion e2 provided in the second binding device component E; a through hole M extending in the up and down directions between the front shaft support portion 5f and the rear shaft support portion 5r; and front and rear notch portions Y provided between the front and rear engaging holes 4f and 4r and the through hole M for avoiding interference with the base ends of the front and rear second ring constituting portions e1(f) and e1(r) in the second binding device component E. The front and rear engaging holes 4f and 4r are provided in the base portion d2, further outward (front and rear) than the location where the shaft portion receiving space sp is formed. The front and rear engaging holes 4f and 4r cooperate with the mounting fixture G to mount the base portion d2 relative to the side cover 3 with the bottom surface of the base portion d2 connected to the inner surface of the side cover 3. Furthermore, the shapes of the base portion d2 near the front and rear engagement holes 4f and 4r, that is, the front and rear end shapes of the base portion d2, are formed to be visually different from each other in order to prevent misidentification of posture during installation. The front and rear shaft supports 5f and 5r rotatably support the ends of the substantially cylindrical shaft e2. Each of the front and rear shaft supports 5f and 5r comprises left and right shaft support walls 51 and 52 spaced apart from each other across a shaft accommodation space sp; an upper shaft support wall 53 connecting the upper ends of the left and right shaft support walls 51 and 52 with their lower surfaces facing the shaft accommodation space sp; and a fall-prevention projection v projecting from the inner surface of the right shaft support wall 52 toward the left shaft support wall 51. When the shaft e2 of the second binding tool member E is accommodated in the shaft accommodation space sp from the lower side of the base portion d2, it is prevented from falling off by the anti-falling protrusions v constituting the front and rear shaft support portions 5f and 5r, and becomes difficult to escape from the shaft accommodation space sp. and a front and rear connecting portion 8 connecting the front and rear ends of the left intermediate wall portion 6 and the right intermediate wall portion 7. A pressed engaging surface 61, 71 is provided in the middle portion of the left and right intermediate wall portions 6, 7 in the front-to-back direction. The pressed engaging surface is pressed by the protrusion t of the shaft portion e2 during the rotation of the second binding member E between the closed position (C) and the open position (P). The left intermediate wall portion 6 is supported in a cantilever manner with respect to the right intermediate wall portion 71 via the front and rear connection portions 7 . [Front and rear first ring components d1(f) and d1(r)] The front and rear first ring components d1(f) and d1(r) are partially annular and extend from the base component d2. Engaging claws x1 project from the front ends of the front and rear first ring components d1(f) and d1(r) in mutually opposing directions. Specifically, the front end of the front first ring component d1(f) projects the engaging claw x1 inward (rearward), while the front end of the rear first ring component d1(r) projects the engaging claw x1 inward (frontward). <Second Binding Component E> The second binding component E is integrally formed of synthetic resin and is supported rotatably relative to the first binding component D. The second binding tool component E has: an axis portion e2, which is rotatably supported relative to the base portion d2; and front and rear second ring forming portions e1(f), e1(r), which extend integrally from the axis portion e2 to form front and rear binding rings R(f), R(r). [Shaft e2] The shaft e2 is a rod-shaped portion extending in the front-rear direction. At least both longitudinal ends of the shaft e2 are cylindrical and rotatably engageable with the front and rear shaft supports 5f and 5r. A protrusion t is integrally formed at the longitudinal middle portion of the shaft portion e2, protruding in a direction perpendicular to the axis s. The protrusion t is configured to temporarily expand the width of the pair of wall portions forming the through hole M, that is, the left and right intermediate wall portions 6 and 7, when the second binder member E is changed from the closed position (C) to the open position (P). That is, the second binding tool component E is constructed in a posture between the closed posture (C) and the open posture (P), that is, the separation width w8 of the left and right middle wall bodies 6 and 7 when it is in the intermediate posture (U) is longer than the separation width w7 of the left and right middle wall bodies 6 and 7 when the second binding tool component E is in the closed posture (C) and the open posture (P). The protrusions t are provided in pairs so as to protrude in opposite directions relative to the shaft e2. The protrusions t are provided on an imaginary straight line q perpendicular to the axis s of the shaft e2 so that their protruding ends t1 substantially coincide with each other. The pair of protrusions t are formed so as to protrude in an oblique direction from the shaft portion e2 when the second binder member E is in the closed position (C) and the open position (P). The pair of protrusions t are formed so as to protrude substantially horizontally from the shaft e2 when the second binder member E is in the intermediate posture (U). In this embodiment, the portion where the shaft portion e2 and the protrusion t are provided is formed into a substantially lemon shape when viewed in cross section. [Front and Rear Second Ring Components e1(f) and e1(r)] The front and rear second ring components e1(f) and e1(r) are partially annular, extending from the shaft portion e2. Engaging claws x2 project from the front ends of the front and rear second ring components e1(f) and e1(r) in opposite directions. Specifically, the front end of the front second ring component e1(f) has the engaging claws x2 projecting outward (forward), while the front end of the rear second ring component e1(r) has the engaging claws x2 projecting outward (rear). The user uses his fingers to temporarily elastically deform the front and rear second ring components e1(f) and e1(r) in a direction toward each other, thereby disengaging the front end portions of the front and rear second ring components e1(f) and e1(r) from the front end portions of the front and rear first ring components d1(f) and d1(r). Then, by rotating the second binding member E relative to the first binding member D, the front and rear binding rings R(f) and R(r) that are in a closed position (C) can be changed in position toward an open position (P). <<Mounting Tool G>> The mounting tool G is used to mount the base portion d2 on the inner surface of the side cover 3. The mounting tool G is formed of a synthetic resin. The mounting device G comprises: a mounting base g1 arranged on the outer side of the side cover 3, a locking protrusion g2 protruding from the mounting base g1, passing through a through hole 31 provided on the side cover 3 and engaging with front and rear locking holes 4f and 4r formed on the base portion d2 as a locking portion. The mounting base g1 is connected to the outer surface of the side cover 3. The mounting base g1 is formed into a rectangular plate extending along the longitudinal direction of the side cover 3. The horizontal width w6 of the mounting base g1 is set to be shorter than the horizontal width w1 of the side cover 3. Notches g11 are provided at left and right side ends of the mounting base g1 to prevent interference with the front and rear second ring components e1 ( f ) and e1 ( r ) serving as the movable ring. Furthermore, since the attachment G is formed in a bilaterally symmetrical shape, it can be properly engaged with the base portion d2 of the binding tool B even if it is turned left-right. The engaging projection g2 is formed at both ends of the mounting base g1 in the longitudinal direction. The engaging projection g2 is composed of two separate claw portions g21. The front portions of the two claw portions g21 constituting the engaging projection g2 have anti-return projections tk formed thereon. The two engaging protrusions g2 provided on the attachment base g1 are engaged with the engaging holes 4f and 4r formed in the front and rear of the base portion d2 of the binding tool B in a locked state. Next, the operation of the binding tool B when the front and rear binding rings R(f) and R(r) in the closed position (C) pass through the intermediate position (U) and change their positions to the open position (P) will be described. First, when the front and rear binding rings R(f) and R(r) are in the closed position (C), the engaging claws x1 of the front end portions of the front and rear first ring components d1(f) and d1(r) and the engaging claws x2 of the front end portions of the front and rear second ring components e1(f) and e1(r) engage with each other. From this state, the user uses his fingers to disengage the engaging claws x1 and x2 in the engaged state, temporarily elastically deforming the front and rear second ring components e1(f) and e1(r) toward each other, and rotates the second binding member E having the front and rear second ring components e1(f) and e1(r) relative to the first binding member D in the direction in which the engaging parts x1 and x2 move away from each other in the left and right directions. At this time, the pair of protrusions t provided on the shaft portion E2 can temporarily expand the separation width of the left and right intermediate wall portions 6 and 7 forming the through hole M during the process of the second binder component E changing from the closed position (C) to the intermediate position (U). That is, the left middle wall body 6, which is cantilevered relative to the right middle wall body 7 via the front and rear connecting parts 8, is pressed by the convex part t when the posture is changed from the closed posture (C) to the middle posture (U), and can be temporarily elastically displaced in a direction away from the right middle wall body 5. That is, the shaft portion e2 having the pair of protrusions t presses and pushes the left and right intermediate wall portions 6 and 7 outwards while the second binder member E changes from the closed position (C) to the intermediate position (U). The pair of protrusions t, which project diagonally in the closed position (C), are formed to project approximately horizontally in the intermediate position (U). The shafts e2 of the pair of protrusions t in the intermediate position (U) are longer in the transverse direction than in the closed position (C). Therefore, the shafts e2 of the pair of protrusions t resist the elastic restoring force of the member that attempts to return the left intermediate wall portion 6 to its original position, pressing the left intermediate wall portion 6 outward and temporarily widening the distance between the left and right intermediate wall portions 6 and 7. From this state, when the shaft portion e2 having the pair of protrusions t further rotates, that is, when it rotates from the intermediate position (U) to the open position (P), the elastic restoring force of the left intermediate wall portion 6, which attempts to return to its original position, presses the portion of the protrusion t on one side other than the top. The second binder member E, receiving the elastic force, is pushed toward the open position (P) and rotates to the final open position (P). Through the above process, the second binder member E can adopt the open position (P) from the closed position (C) through the intermediate position (U), and can be stabilized in a state that is difficult to return to the final open position (P). Furthermore, the second binder member E can be rotated from the open position (P) to the closed position (C) via the intermediate position (U) by performing the above-mentioned procedure in reverse order using the operating force of the user. As described above, the binding device B of this embodiment comprises: a first binding device component D having front and rear first ring components d1(f), d1(r), and a second binding device component E having front and rear second ring components e1(f), e1(r), and is constructed so as to be capable of adopting a closed posture (C) in which the front end portions of the front and rear first and second ring components d1(f), d1(r), e1(f), e1(r) are engaged with each other, and an open posture (P) in which the front end portions of the front and rear first and second ring components d1(f), d1(r), e1(f), e1(r) are separated. Moreover, the first binding member D has a base portion d2, which is provided with a through hole M extending in the up and down directions, and the second binding member E has a protrusion t, which can temporarily expand the separation width of the left and right middle wall portions 6 and 7 of the paired wall portions forming the through hole M during the process of changing the posture from the closed posture (C) to the open posture (P). Therefore, according to this embodiment, a binding tool capable of appropriately maintaining the open posture of the binding rings can be provided. That is, the protrusion t provided on the second binder member E can temporarily expand the width of the gap between the left and right intermediate wall portions 6 and 7 that form the through hole M during the process of changing the position from the closed position (C) to the open position (P). Therefore, after the second binder member E reaches the open position (P), the left and right intermediate wall portions 6 and 7 can appropriately suppress the return to the closed position (C). The left and right intermediate walls 6 and 7 are pressed by the projections t to form through-holes. Therefore, elastic deformation of the left and right intermediate walls 6 and 7 to expand their separation width is easily and balanced, resulting in a structure with excellent strength that can withstand repeated use. The second binding member E includes a shaft portion e2 rotatably supported relative to the base portion d2 and front and rear second ring components e1 (f) and e1 (r) integrally extending from the shaft portion e2 . Furthermore, the shaft portion e2 is provided with a protrusion t. Therefore, the width of separation between the left and right intermediate wall portions 6 and 7 forming the through-hole M can be temporarily expanded by the protrusion t provided on the shaft portion e2. The base portion d2 includes a pair of shaft support portions 5f and 5r that rotatably support both end portions of the shaft portion e2, and a through hole M provided between the pair of shaft support portions 5f and 5r. Therefore, the base portion d2 not only can rotatably support the shaft portion e2 but also has a suitable structure for engaging with the projection t. The first binder member D and the second binder member E are each formed of a synthetic resin. Therefore, the binder B is excellent in flexibility in elastic deformation, light weight, and design freedom in that it can be formed into a complex shape. The file folder of this embodiment includes a cover A and a binding tool B attached to the cover A. Therefore, it is possible to provide a file having excellent workability in attaching and detaching the bound objects while appropriately maintaining the open posture (P) of the front and rear binding rings R(f) and R(r). The cover A includes a front cover 1, a bottom cover 2, and a side cover 3. A first binding member D is attached to the inner surface of the side cover 3 using an attachment G. Therefore, since the first binding member D is located on the inner side of the side cover 3, the cover A can be properly positioned in a double-leaf position (H) on a placement surface such as a top plate. The mounting device G comprises: a mounting base g1 located on the outer side of the side cover 3, and a locking protrusion g2 protruding from the mounting base g1 and penetrating the side cover 3, and locking with the front and rear locking holes 4f and 4r which are the locking parts formed on the base part d2. Therefore, the attachment G can be appropriately attached to the base portion d2 of the binding tool B on the inner surface of the side cover 3. In addition, the present invention is not limited to the embodiments described above in detail. The base portion of the first binder member may also be provided with a recess that opens upward instead of a through hole that penetrates in the vertical direction. Even if it is such a structure, the projection of the second binder member can temporarily expand the separation width of the paired wall portions that form the recess, and can achieve the desired purpose. The first and second binding members are not limited to being able to rotate relative to each other. For example, the first and second binding members may be relatively displaced by sliding, for example, to achieve a closed position in which the front ends of the first and second ring components engage with each other, and an open position in which the front ends of the first and second ring components separate from each other. The convex portion is not limited to being provided on the shaft portion, and the convex portion only needs to be provided on the second binding tool member. The shapes of the communication holes provided in the front cover and the bottom cover can be various and are not limited to those shown in the above-mentioned embodiment. The base portion of the binding tool can be installed on the inner surface of the side cover in an appropriate manner. For example, the base portion can also be installed on the inner surface of the side cover using an adhesive rather than a mounting tool. The installation tool can be single or multiple. In other words, one installation tool can be used to install two binding tools on the side covers of the cover, or two or more installation tools can be used to install one binding tool on the side covers of the cover. The engaging protrusion does not need to be locked in engagement with the engaging portion. The engaging portion is not limited to the engaging hole, and may be in any shape as long as it is a structure capable of engaging with the engaging protrusion. The horizontal width of the side cover may also be set to be substantially the same as the horizontal width of the base. The cover may be configured so that the outer surfaces of the front cover and the bottom cover cannot be folded so as to face each other. Furthermore, the specific configuration of each component is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. A: Cover 1: Front cover 2: Bottom cover 3: Side cover B: Binding tool D: First binding tool component E: Second binding tool component G: Mounting tool [Figure 1] A perspective view of an embodiment of the present invention. [Figure 2] A top view of the embodiment. [Figure 3] A perspective view of the embodiment. [Figure 4] A perspective view of the embodiment. [Figure 5] A perspective view of the embodiment. [Figure 6] A perspective view of the embodiment. [Figure 7] An exploded perspective view of the embodiment. [Figure 8] A sectional view taken along line AA of Figure 2. [Figure 9] An exploded perspective view of the embodiment. [Figure 10] An exploded perspective view of the embodiment. [Figure 11] A sectional view taken along line BB of Figure 2. [Figure 12] A sectional view taken along line CC of Figure 4. [Figure 13] A sectional view taken along line DD of Figure 5. [Figure 14] A left side view of the embodiment. [Figure 15] A sectional view taken along line EE of Figure 14. [Figure 16] A sectional view taken along line EE of Figure 14 (a sectional view taken along the same cut as in Figure 15). 1: Front cover 2: Bottom cover 3: Side cover 6: Left middle wall 7: Right middle wall 8: Front and rear connection 11: Front cover body 12: Base end front cover 21: Bottom cover body 22: Base end bottom cover 61: Pressed engagement surface 71: Pressed engagement surface A(H): Cover (front cover facing left) B(U): Binding tool (middle posture cn: Middle hinge D: First binding tool component d1(r): first ring component d2: base E: Second binding member e1(r): Second ring component e2: around the shaft G: Mounting tool g1: Install the base M:Through hole N: Hinge R(r): Rear binding ring s: axis sp: shaft accommodation space t: convex part t1: overhang w8: separation width x1: snap-fit ​​part

Claims

1. A binding device comprising: a first binding device member having a first ring component and a second binding device member having a second ring component, wherein the binding device is configured to be capable of a closed position in which the front ends of the first and second ring components engage with each other and an open position in which the front ends of the first and second ring components separate, characterized in that: the first binding device member has a base portion having a through hole extending vertically when in a horizontal position; and the second binding device member has a protrusion that, during the change of position from the closed position to the open position, temporarily expands the separation width of the paired wall portions forming the through hole.

2. As in request item 1, the binding fixture, wherein, The aforementioned second binding member includes: a shaft portion that is rotatably supported relative to the aforementioned base portion; and the aforementioned second ring component that extends integrally from the shaft portion, wherein the aforementioned protrusion is provided on the aforementioned shaft portion.

3. As in request item 2, the binding fixture, wherein, The aforementioned base portion includes: a pair of shaft support portions capable of rotatably supporting both ends of the aforementioned shaft portion, and the aforementioned through hole provided between the pair of shaft support portions.

4. As in request item 1, the binding fixture, wherein, The aforementioned first binding component and the aforementioned second binding component are respectively formed of synthetic resin.

5. A folder having a cover and a binding device attached to the cover, as described in any one of claims 1 to 4.

6. As in request item 5, the folder, The aforementioned cover includes a front cover, a bottom cover, and a side cover. The aforementioned first binding component is installed on the inner side of the aforementioned side cover using a mounting tool.

7. As in request item 6, the folder, The aforementioned mounting includes: a mounting base located on the outside of the aforementioned side cover, and a locking protrusion that protrudes from the mounting base, penetrates the aforementioned side cover, and engages with the locking portion formed on the aforementioned base.

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