JP5797685B2 - Loose leaf binding - Google Patents

Description

  In this invention, each of two substrates parallel to each other is rotated and displaced around a shaft portion arranged on the back side thereof, so that a plurality of pairs of half ring portions integrally formed on the front surface side of each substrate are formed. The loose-leaf binding device is configured to be movable between a closed position in which the respective distal end portions are adjacent to each other to form a ring shape and an open position in which the respective distal end portions are separated from each other, In particular, the present invention proposes a technique that makes it easy to open and close the half-ring portion and that can securely fix the half-ring portion in the closed position.

Conventionally, as described in Patent Document 1, as a binding tool of this type, two substrates and a half ring portion integrally formed on each of the substrates and extending in a semicircular shape on the surface side of the substrate And a shaft portion disposed on the back side of the substrate and parallel to the substrate, and a bearing tube portion provided on each of the two substrates so as to surround the shaft portion.
In such a binding tool, each of the two substrates is rotationally displaced around the shaft portion. It is possible to move between an open position where the leading end portions are separated from each other and a closed position where the leading end portions approach each other. In particular, in this binding device described in Patent Document 1, loose leaf paper bound thereto is used. Each can rotate approximately 360 ° along the ring shape formed by the pair of half-ring portions in the closed position.

  By the way, in the binding tool described in Patent Document 1, hook-shaped “binding pinching portions that are hooked to each other when the pair of half ring portions move to the closed position at the respective tip portions of the respective half ring portions. ”, And the respective“ ring-binding locking portions ”fix the paired half-ring portions in a closed position.

JP2011-224869A

  However, in the above-described binding tool, when the half ring portion is locked in the closed position, only the “binding pinch portion” formed at the tip of the half ring portion extending in a semicircular shape on the surface side of each substrate is used. The half-ring portion is fixed, and the “binding binding portion” is formed at the tip portion of the half-ring portion that is located away from the substrate operated by the user. Due to misalignment caused by use between the two substrates, the accuracy of molding of the substrate and other members, etc., it becomes difficult to hook the “binding binding portions” that make a pair with each other. Therefore, there is a problem that there is no guarantee that the loose-leaf paper can be reliably held by fixing the half-ring portion in the closed position.

  An object of the present invention is to solve such problems of the prior art described above, and the object of the present invention is to easily and reliably fix the half ring portion in the closed position. It is to provide a loose-leaf binding that can be performed.

The loose-leaf binding device according to the present invention includes two substrates that extend in parallel to each other and are arranged adjacent to each other, and are integrally formed on each of the substrates, extend to the surface side of the substrate, and jointly form a ring shape. A plurality of pairs of half-ring portions, a shaft portion disposed on the back surface side of the substrate, extending in parallel with the substrate, and provided on the back surface side of the substrate integrally with each substrate surrounding the shaft portion. And a bearing tube portion that enables rotational displacement of each substrate around the shaft portion, and a plurality of pairs of half-ring portions are paired by rotational displacement around the shaft portion of each substrate. The loose-leaf binding device is configured to be movable between a closed position in which the tip portions of the half ring portions formed form a ring shape close to each other and an open position in which the tip portions are separated from each other. Next to the longitudinal direction of the board A gap that allows relative displacement along the longitudinal direction of each substrate is provided between the bearing tube portions, and the two substrates are biased along the longitudinal direction on the back side of the substrate. A coil spring is provided, and each surface of the substrate is provided with at least a pair of hook engaging portions that are hooked to each other on the basis of the biasing force of the coil spring to maintain the half ring portion in the closed position . Forming a notch portion formed by alternately cutting one half and the other half of the longitudinal direction of each of the tip portions at each tip portion of the half ring portion formed; An inner peripheral portion left on the inner peripheral side of the notch portion, and a protrusion formed by the notch portion and covering the outer peripheral side of the inner peripheral portion at the closed position to be aligned with the inner peripheral portion. It will be.

  In the loose-leaf binding device according to the present invention, the half-ring portion is guided to the closed position or the open position in a state of mutual contact with the respective side surfaces of the pair of hook engaging portions provided on each of the two substrates. It is preferable to provide each sliding surface. Such a hook engaging portion can be attached to the surface of the substrate as a member separate from the substrate, but is preferably formed integrally with a substrate made of a resin material, for example.

Further, in the loose-leaf binding device of the present invention, the coil spring is provided with a pair of legs that urge the half-ring portion in the direction of movement to the open position in the direction of rotation of the substrate around the shaft portion, It is preferable that each of the leg portions is disposed in contact with each of the inner side surfaces of each substrate.
In addition, it is preferable to provide a knob portion that is used for clamping by a user when the half ring portion is opened and closed on at least one end side in the longitudinal direction of the substrate.

In the present invention, it is preferable that the opening angle θ around the central axis of the shaft portion of the paired half ring portions at the open position of the half ring portion is in the range of 90 ° to 180 °. .
Preferably, the shaft portion is one extending from one end side to the other end side of the substrate.

According to the loose-leaf binding device of the present invention, at least a pair of pulls that are hooked on the respective surfaces of the substrate based on the urging force in the longitudinal direction of the substrate by the coil spring to maintain the half ring portion in the closed position. When the half-ring portion is opened / closed by providing the hook / engagement portion, the user generally holds the substrate side instead of the half-ring portion side when rotating the substrate around the shaft portion. However, it is possible to easily hook the paired hook engaging portions located close to the substrate, thereby facilitating the fixing operation of the half ring portion and closing the half ring portion. Can be securely fixed in position.
Note here, the front end portion of the semi-ring portion, in addition to the hook engaging portion of the provided on the substrate surface, the locking means for fixing the mutual half-ring portions paired in the closed position can also be provided Yes, the degree of freedom in designing the tip shape of the half ring portion can be increased.

  Here, when the respective sliding surfaces for guiding the half-ring portion to the closed position or the open position are provided on the respective side surfaces of the pair of hook engaging portions in the contact state with each other, the pair of pulling engaging portions is provided. With the hooking engagement parts in close proximity to each other, the respective sliding surfaces of the hooking engagement parts slide against each other, resulting in displacement of the half ring part and the substrate, guiding the half ring part to the closed or open position Therefore, the opening / closing operation of the half ring portion can be further facilitated.

  When such a hook engaging portion is formed integrally with the substrate, mass production of the loose-leaf binding device is facilitated, and productivity can be greatly improved.

  By the way, the above-described coil spring is provided with a pair of legs that urge the half-ring part to move to the open position in the direction of rotation of the board around the shaft, and each leg is attached to each board. Of the coil spring in which the half ring portion functions as a so-called torsion coil spring by releasing the hooking posture of the hook engaging portion described above. Since it automatically moves to the open position based on the urging force of the leg portion, the opening and closing operation of the half ring portion can be made easier, and excellent operability can be realized.

  Here, in the case where a half-ring portion is provided for gripping by the user on the opening and closing operation of the half ring portion on at least one end side in the longitudinal direction of the substrate, the user opens and closes the half ring portion. In doing so, the substrate can be easily rotated and displaced around the shaft.

Also, here, when the opening angle θ around the central axis of the shaft portion of the half ring portions at the open position of the pair of half ring portions is in the range of 90 ° to 180 °, When the half-ring portion is moved to the open position, loose leaf paper can be easily attached to and detached from the half-ring portion.
In other words, if the opening angle of the half-ring part is less than 90 °, it may be difficult to attach or detach loose-leaf paper due to the narrow spacing between the tip parts of the paired half-ring parts. On the other hand, if the rotation angle of each half-ring part exceeds 180 °, the half-ring part opens too much, so that when the half-ring part is moved to the open position, it is bound there. Loose leaf paper that has been stored may come off unintentionally.

  When the shaft portion is a single piece extending from one end side to the other end side of the substrate, the rotational displacement of the substrate around the shaft portion can be always performed in a stable posture.

It is the front view and right view which show about one Embodiment of the loose-leaf binding tool of this invention. It is the rear view and left view of the loose-leaf binding tool of FIG. It is a principal part expansion perspective view which shows each state from the open position to the middle of the loose-leaf binding tool of FIG. 1 from an open position to a closed position. It is a principal part expansion perspective view which shows each state following FIG. It is an enlarged front view which shows the center part of the longitudinal direction of the loose-leaf binding tool of FIG. 1 in the state which the half ring part moved to the open position. It is the front view and top view which take out from the binding tool and show the coil spring which can be provided in the loose-leaf binding tool of FIG. It is a principal part expansion perspective view of the loose leaf binding tool which shows the modification of the coiled spring which can be provided in a loose leaf binding tool. It is sectional drawing which follows the VIII-VIII line of Fig.1 (a), and the same figure in the state which the half ring part moved to the open position. It is the same figure which shows the enlarged rear view of the one end part of the loose-leaf binding tool of FIG. 1, and the modification of the one end part. It is a principal part expansion perspective view which shows the modification of the front-end | tip part of a half ring part of the loose-leaf binding tool of FIG. 1 in each state just before this half ring part reaches a closed position.

Embodiments of the present invention will be described below with reference to the drawings.
The loose-leaf binding tool 1 illustrated in FIGS. 1 and 2 extends in parallel with each other in the vertical direction in the drawing, and is integrally formed with two substrates 2a and 2b arranged adjacent to each other and each of the substrates 2a and 2b. For example, a plurality of pairs of half-ring portions 3a and 3b extending in a semicircular shape from the outer surface S1 of each substrate 2a and 2b to the surface F side, and the substrate 2a disposed on the back surface B side of the substrates 2a and 2b. 2b and the back surface B of each of the substrates 2a and 2b are integrally formed with each of the substrates 2a and 2b so as to surround the shaft portion 4. For example, the shaft portion 4 is disposed inside. The hollow cylinder type bearing cylinder portions 5a and 5b are provided.

Here, of the two substrates 2a and 2b, the one located on the left side of the drawing in the front view of FIG. 1A is one substrate 2a, and the one located on the right side in the drawing is the other substrate 2a. A substrate 2b, and a half ring portion 3a on the one substrate 2a side, and the other substrate 2b positioned adjacent to the half ring portion 3a in the left-right direction of the figure perpendicular to the longitudinal direction of the substrates 2a and 2b. A pair of the half ring portions 3b on the side is arranged in a pair along the longitudinal direction of the substrates 2a and 2b with a predetermined interval.
In the illustrated embodiment, as is apparent from the side views shown in FIGS. 1B and 2B, a plurality of bearing tube portions 5a formed integrally with one substrate 2a and the other substrate are provided. Each of the plurality of bearing tube portions 5b integrally formed on the 2b side is arranged alternately along the longitudinal direction of the substrates 2a and 2b.

  Further, in this binding tool 1, for example, one shaft portion 4 made of a metal material or a resin material passes through the inside of each of the bearing tube portions 5a and 5b arranged coaxially so that the central axis is common. The shaft portion 4 functions to connect the one substrate 2a and the other substrate 2b to each other by their respective bearing tube portions 5a and 5b. In addition, although illustration is abbreviate | omitted, a shaft part can also be made into two or more divided | segmented into the longitudinal direction of the board | substrate, In this case, for example, each of a some shaft part is made into bearing cylinder part 5a, 5b. It is also possible to integrally form each of them.

  According to such a configuration of the binding tool 1, the respective substrates 2 a and 2 b integrated with the respective bearing tube portions 5 a and 5 b through which the single shaft portion 4 passes are rotationally displaced around the shaft portion 4. In accordance with this rotational displacement, the half ring portions 3a and 3b provided on the respective substrates 2a and 2b are transformed into half rings as shown in FIG. The open position where the tip portions of the portions 3a and 3b are separated from each other and the tip portions of the paired half ring portions 3a and 3b come close to each other and come into contact with each other to form a ring shape as shown in FIG. It is possible to move between the closed positions to be formed. Thereby, in the open position of the half ring portions 3a and 3b, the half ring portions 3a and 3b are inserted into the plurality of through holes provided in the side portions of the loose leaf paper (not shown) from the leading end portion, or the half ring portions 3a By removing the loose leaf paper inserted into the through hole 3b from the half ring portions 3a and 3b, the loose leaf paper (not shown) can be attached to and detached from the binding tool 1, and the loose ring paper is half-ringed into the through hole of the loose leaf paper. One or more loose leaf sheets can be bound by moving the half ring portions 3a, 3b to the closed position with the portions 3a, 3 inserted.

  Here, in order to enable the half ring portions 3a and 3b to be locked in their closed positions, in the present invention, as shown in the rear view of FIG. A gap G having a required size is provided between the adjacent bearing cylinder portion 5a on the one substrate 2a side and the bearing cylinder portion 5b on the other substrate 2b side, and the two substrates 2a and 2b are Relative displacement is possible along the longitudinal direction without interference between the bearing tube portions 5a and 5b.

  In this case, on the back surface B side of the substrates 2a and 2b, for example, a coil spring 6 is sandwiched and disposed in one of the gaps G between the adjacent bearing tube portions 5a and 5b. The springs 6 urge the substrates 2a and 2b along the longitudinal direction, and the closed positions of the half ring portions 3a and 3b on the surface F of the substrates 2a and 2b as shown in FIG. Then, the hook engaging portions 7a and 7b that are hooked to each other based on the biasing force of the coil spring 6 to maintain the half ring portions 3a and 3b in the closed position are integrated with the respective substrates 2a and 2b. Or provided separately from the substrates 2a and 2b.

  According to this, from the open position of the half ring portions 3a, 3b shown in FIG. 3 (a), the two substrates 2a, 2b are resisted against the urging force in the longitudinal direction of the coil spring 6. The two substrates 2a and 2b are rotationally displaced around the shaft portion 4 while being relatively displaced in the direction indicated by the arrow in 3 (b), thereby forming a pair as shown in FIG. 3 (c). The half ring portions 3a and 3b are slightly displaced from each other in the longitudinal direction of the substrates 2a and 2b, and their respective leading end portions approach each other. Accordingly, pulls provided on the respective surfaces F of the substrates 2a and 2b are provided. The hook engaging portions 7a and 7b also approach each other and come into contact with the sliding surfaces 8a and 8b provided on the side surfaces of the hook engaging portions 7a and 7b.

  Thereafter, due to further rotational displacement of the substrates 2a and 2b, as shown in FIG. 4 (a), the sliding surfaces 8a and 8b of the hook engaging portions 7a and 7b slide, and the substrates 2a and 2b become longitudinal. As shown in FIG. 4 (b), the half ring portions 3a and 3b are guided to the closed position as shown in FIG. 4 (b), and the coil spring 6 is attached as shown in FIG. 4 (c). Based on the force, the substrates 2a and 2b are relatively displaced to their original positions, so that the paired half-ring portions 3a and 3b are closed at positions aligned with each other in the longitudinal direction, and the hook engaging portions 7a and 7b The half ring portions 3a and 3b are locked in the closed position.

  On the other hand, in order to release the locked state at the closed position of the half ring portions 3a and 3b, the substrates 2a and 2b are relatively displaced along the longitudinal direction from the closed position shown in FIG. By rotating and displacing 2b around the shaft portion 4, each state shown in FIGS. 3C and 3B is sequentially changed from the state shown in FIGS. 4B and 4A to FIG. As shown in a), the half ring portions 3a, 3b can be opened.

  Here, in the illustrated embodiment, the hook engaging portions 7a and 7b forming a pair provided on the surfaces of the substrates 2a and 2b are closed by the half ring portions 3a and 3b as shown in FIG. At the position, it extends toward the adjacent substrates 2b and 2a, and in the middle of its extension, it has a tapered plate shape that bends in opposite directions in the longitudinal direction of the substrates 2a and 2b. The portions 7 a and 7 b are not limited to the illustrated shapes as long as the portions 7 a and 7 b are hooked to each other by the longitudinal biasing force of the coil spring 6.

  Further, here, the side surfaces of the hook engaging portions 7a, 7b facing the adjacent substrates 2b, 2a are inclined with respect to the longitudinal direction of the substrates 2a, 2b as shown in FIGS. It is preferable to provide sliding surfaces 8a and 8b made of curved surfaces or flat surfaces facing the engaging engagement portions 7b and 7a that make a pair in the posture. According to this, as described above, when the half ring portions 3a and 3b are moved to the open position or the closed position, the sliding surfaces 8a and 8b of the paired hook engaging portions 7a and 7b slide on each other. Thus, by functioning to guide the movement, the opening and closing operation of the half-ring portions 3a and 3b becomes easier.

In addition, here, each of the hook engaging portions 7a and 7b is formed integrally with each of the substrates 2a and 2b made of resin, for example, by injection molding or the like, and is integrated with each of the substrates 2a and 2b. . This is preferable in that the man-hours can be reduced and the production efficiency of the binding device 1 can be improved as compared with the case where the hook engaging portion as a separate member is attached to the substrate.
However, it is possible to attach the hook engaging portion as a separate member to the substrates 2a and 2b by fixing or fixing them by using an adhesive or the like. When integrally forming the hook engaging portions 7a, 7b on the substrates 2a, 2b, it is necessary to change the shape of the mold forming surface for forming them, but the hook engaging portions 7a, When attaching 7b to the board | substrates 2a and 2b, since the change of such a metal mold | die is not required, the increase in manufacturing cost can be suppressed small.

Incidentally, as described above, a plurality of coil springs 6 that urge the two substrates along each other in the longitudinal direction can be provided, but here, one coil spring 6 is shown in FIG. As shown in the enlarged front view, the substrate 2a, 2b is disposed at the center in the longitudinal direction.
6A and 6B, the coil spring 6 is an axis of the main body 6a formed by extending a metal wire in a spiral shape, as is apparent from the take-out from the binding device 1 shown in FIGS. For example, leg portions 6b and 6c formed by extending the metal wire linearly outward from the outer periphery of the coil in the radial direction can be provided at each of both ends in the direction. In this case, as shown in FIG. 5, the respective leg portions 6b and 6c are brought into contact with the respective inner side surfaces S2 facing each other in the closed position of the half ring portions 3a and 3b of the respective substrates 2a and 2b. Preferably, the substrates 2a and 2b are urged by the coil spring 6 so as to move the half ring portions 3a and 3b to the open position.

  With such a configuration of the coil spring 6, only by performing an operation of relatively displacing the substrates 2a and 2b along the longitudinal direction from the closed position shown in FIG. 6c urges the substrates 2a and 2b to spread from the inner surface S2 side, and in the order of FIGS. 4 (b) and (a) and FIGS. 3 (c) and (b) Then, the substrates 2a and 2b are rotated and displaced around the shaft portion 4, and the half ring portions 3a and 3b are opened and automatically moved to the open position shown in FIG. This makes it very easy to open the half ring portions 3a and 3b. In order to move the half ring portions 3a and 3b from the open position to the closed position, the substrates 2a and 2b are rotationally displaced around the shaft portion 4 against the urging force of the leg portions 6b and 6c of the coil spring 6. Can be done.

  On the other hand, in the loose-leaf binding device 1 of the present invention, as shown in a perspective view in FIG. 7, it is possible to dispose a general coil spring 26 that does not have the leg portions 6b and 6c as described above. . In this case, the coil spring 26 having no leg portion urges the two substrates 2a and 2b along the longitudinal direction so that the hook engaging portion 7a is in the closed position of the half ring portions 3a and 3b. , 7b functions to hook each other, but does not have the function of pushing the substrates 2a, 2b like the coil spring 6 with the legs 6b, 6c. In an actual use state, even if it is a loose-leaf binding device provided with a coil spring 26 without legs as shown in FIG. 7, only by releasing the engagement state of the hook engaging portions 7a and 7b, The half ring portions 3a and 3b may automatically move to the open position due to the weight of loose leaf paper or cover sheets bound to the half ring portions 3a and 3b. When the coil spring 26 having no legs is used, it is not necessary to form grooves as shown in FIG. 3 for positioning the legs on the inner surface S2 of the substrates 2a and 2b. There is an advantage that it is easy to assemble the constituent members when the tool 1 is manufactured.

  In the illustrated embodiment, the coil spring 6 is disposed in one of the gaps G between the bearing tube portions 5a and 5b integrally formed on the respective substrates 2a and 2b, but the illustration is omitted. However, it is also possible to provide a spring receiving portion as a portion different from the bearing tube portions 5a and 5b on the back surface B side of the substrates 2a and 2b, and arrange the coil spring 6 there.

In such a binding device 1, when the half ring portions 3a and 3b are moved from the closed position shown in FIG. 8A to the open position shown in FIG. 8B, the half ring portions 3a and 3b are the most. It is preferable that the opening angle θ of the paired half ring portions 3a and 3b at the opened position, which is wide open, is measured around the central axis C of the shaft portion 4 to be in the range of 90 ° to 180 °. By setting the opening angle θ within this range, loose leaf paper (not shown) can be attached to and detached from the binding device 1 without any inconvenience, and loose leaf paper at the open position of the half ring portion. Can be effectively prevented.
In accordance with such an opening angle θ of the half ring portions 3a and 3b, angles formed by the respective leg portions 6b and 6c of the coil spring 6 as shown in FIG. 6B can be appropriately set.

  In the present invention, as shown in the enlarged rear view in FIG. 9A, the user holds the half ring portions 3a and 3b at least at one end side in the longitudinal direction of the substrates 2a and 2b. It is preferable to provide the knob portions 2c and 2d.

More specifically, in the illustrated binding tool 1, at one end (here, the lower end) thereof, as shown in FIG. 9A, the most end bearing tube 5 a provided on one substrate 2 a. On the other hand, the knob portion 2c is provided so as to cover the one end. On the other hand, the other end portion (here, the upper end portion) of the binding device 1 is not shown in detail, but the other portion of the other substrate 2b A knob portion 2d is provided at the other end of the bearing cylinder portion 5b on the end side so as to cover the other end. As shown in FIG. 9 (a), the bearing cylinder portion 5a on the most end side is disposed with a required large gap G between the bearing cylinder portion 5b adjacent to the other substrate 2b and adjacent to it. The same applies to the bearing tube portion 5b on the other end side of the binding device 1 on the other end side.
According to the structure shown in FIG. 9 (a), while the half ring portions 3a and 3b are closed, the user holds the respective knob portions 2c and 2d, and the knob portions 2c and 2d are As shown by the white arrow in FIG. 9 (a), by pushing toward the center in the longitudinal direction of the binding device 1, the substrates 2a and 2b are relatively displaced in the direction in which the large gap G on the one end side is narrowed. Thus, the engaged state of the hook engaging portions 7a and 7b can be released.

On the other hand, in the modification shown in FIG. 9B, at one end of the binding tool 1, the most end bearing cylinder portion 25b is formed on the other substrate 2b side, and the bearing cylinder portion 25b The gap G between the adjacent bearing cylinder portion 25a on the one substrate 2a side is extremely small. Although illustration is omitted, the other end portion of the binding device 1 also has the same structure as the one end portion.
In this case, the user pulls the knob portions 2c provided at both ends of the binding device 1 toward the outside in the longitudinal direction of the binding device 1 as shown by the white arrows in FIG. It is possible to release the engagement state of the hook engaging portions 7a and 7b by relatively displacing the substrates 2a and 2b in the direction in which the small gap G is widened.

  According to the loose-leaf binding device 1 as described above, the half-ring portion is fixed in the closed position for binding the loose-leaf paper to the binding device 1 by providing the above-described hook engaging portions 7a and 7b. Therefore, it is possible to realize excellent operability and to increase the degree of freedom in designing the tip portions of the half ring portions 3a and 3b. In the embodiment described above, the notch portions 3c and 3d are formed by alternately notching the half portions on one side and the other side in the axial direction at the tip portions of the half ring portions 3a and 3b forming a pair. 4 are aligned with each other at the closed positions of the half-ring portions 3a and 3b to form a ring shape by the half-ring portions 3a and 3b, as shown in FIG.

  On the other hand, as in the modification shown in FIG. 10, the ring which fixes the half ring portions 3a and 3b in the closed position by engaging the tip portions of the half ring portions 3a and 3b close to each other. Locking means 9 can be provided.

The ring lock means 9 will be described in detail as an example of the modification shown in FIG. 10. In this modification, the tip ends of the paired half ring portions 3a and 3b are connected to one side and the other side in the axial direction. In the half ring portions 3a and 3b, the half ring portions 3a and 3b have an outer periphery extending parallel to the axial direction on the outer peripheral surface of the inner peripheral portion 10 slightly left on the base end side. while providing the convex portion 11 projecting to the side, the other half ring portion 3b, 3a, the inner peripheral surface of the projecting portion 12 formed by notch part component, and the axis direction similarly to the convex portion 11 A concave portion 13 extending in parallel and recessed toward the outer peripheral side is provided, and the ring lock means 9 is constituted by the convex portion 11 and the concave portion 13. As shown in the figure, whether the convex portion 11 or the concave portion 13 is provided on the one or the other half ring portion 3a, 3b side is determined by the mutual pair of half ring portions adjacent to each other in the longitudinal direction of the substrates 2a, 2b. Can be different.

  According to the ring lock means 9, as shown in FIGS. 10 (a) and 10 (b), the substrates 2a and 2b are rotated and displaced around the shaft portion 4, so that each of the hook engaging portions 7a and 7b. When the sliding surfaces 8a and 8b of the first and second sliding members 8a and 8b slide, the pair of half ring portions 3a and 3b approach each other in a posture shifted from each other in the longitudinal direction, and then the biasing force along the longitudinal direction of the coil spring 6 2a and 2b are relatively displaced in the longitudinal direction, and when the hook engaging portions 7a and 7b are hooked to each other, one half ring is formed in the recess 13 provided at the tip of the other half ring portion 3b and 3a. When the convex portions 11 provided at the tip portions of the portions 3a and 3b enter and slide and displace in the longitudinal direction, the convex portions 11 and the concave portions 13 are engaged in the closed position of the half ring portions 3a and 3b. So half ring part 3a, 3b It can be fixed in the chain position.

DESCRIPTION OF SYMBOLS 1 Loose leaf binding tool 2a, 2b Substrate 2c, 2d Knob part 3a, 3b Half ring part 3c, 3d Notch part 4 Shaft part 5a, 5b Bearing cylinder part 6, 26 Coil spring 6a Body part 6b, 6c Leg part 7a, 7b Hook engaging part 8a, 8b Sliding surface 9 Ring lock means 10 Inner peripheral part 11 Convex part 12 Protruding part 13 Concave part

Claims (8)

Two substrates extending parallel to each other and arranged adjacent to each other, and a plurality of pairs of half-ring portions formed integrally with each of the substrates, extending to the surface side of the substrate and jointly forming a ring shape And a shaft portion disposed on the back surface side of the substrate and extending in parallel with the substrate, and provided on the back surface side of the substrate so as to surround the shaft portion and integrally with each substrate, and around the shaft portion. Comprising a bearing tube that enables rotational displacement of each substrate,
A closed position in which a plurality of pairs of half-ring portions are formed in close proximity to each other to form a ring shape by rotating a plurality of pairs of half-ring portions by rotational displacement around the shaft portion of each substrate, respectively. A loose-leaf binding device configured to be movable between an open position where the distal ends of the two are separated from each other,
Between the bearing tube portions adjacent to each other in the longitudinal direction of the substrate, a gap allowing relative displacement of each substrate along the longitudinal direction is provided, and the two substrates are elongated on the back side of the substrate. At least a pair of hooking engagements, each having a coil spring biased along a direction and being hooked on each surface of the substrate based on the biasing force of the coil spring to maintain the half ring portion in the closed position Set up a section ,
A notch portion is formed at each tip portion of the pair of half ring portions by alternately cutting off one half and the other half of the tip in the longitudinal direction. An inner peripheral portion left on the inner peripheral side of the notch portion and a protrusion formed by the notch portion and covering the outer peripheral side of the inner peripheral portion at the closed position and aligning with the inner peripheral portion A loose-leaf binding tool.   Each sliding surface for guiding the half-ring portion to the closed position or the open position is provided on each side surface of the hook engaging portion forming a pair provided on each of the two substrates in a contact state with each other. The loose-leaf binding device according to claim 1. A convex portion extending in parallel with the longitudinal direction is provided on the outer peripheral surface of the inner peripheral portion of one half ring portion of the pair of half ring portions, and the inner peripheral surface of the protruding portion of the other half ring portion is provided. The loose-leaf binding device according to claim 1, wherein a concave portion that extends in parallel with the longitudinal direction and into which the convex portion enters at the closed position is provided. The loose-leaf binding tool as described in any one of Claims 1-3 which forms the said hook engaging part integrally with a board | substrate. The coil spring is provided with a pair of legs for urging the half ring portion to move to the open position in the direction of rotation of the board around the shaft, and each of the legs is attached to the inner part of each board. The loose-leaf binding tool as described in any one of Claims 1-4 arrange | positioned in contact with each of the side surface. The loose-leaf binding according to any one of claims 1 to 5 , wherein a knob portion provided for clamping by a user is provided on at least one end side in the longitudinal direction of the substrate for opening and closing the half ring portion. Ingredients. Wherein in an open position of the half-ring portion, a semi-ring portion paired, the opening angle θ around the center axis of the shaft portion, comprising a range of 90 ° to 180 °, any one of claims 1 to 6 A loose-leaf binding device according to one item. It said shaft portion, made as a single extending from one end of the substrate to the other end, loose-leaf binding device according to any one of claims 1-7.

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