JP4870229B2 - Binding tool - Google Patents

Description

  The present invention relates to a technique of a binding tool having an openable / closable ring portion for closing a document.

  A binding tool that binds and removes paper sheets such as documents when the tips of the first binding shaft and the second binding shaft forming the ring are opened and closes the tips is known. It has been. In such a conventional binding tool, in a state where the two binding shafts are closed, the tips of the binding shafts are opened due to the external force, the weight of the bound paper sheets, and the like. Leaves sometimes dropped out.

  As a technique developed to solve the above problem, a conventional technique relating to a binding tool in which the binding shaft cannot be opened unless the tips of the two binding shafts are engaged in a closed state and the engagement state between the tips is released. Is known (see, for example, Patent Document 1 and Patent Document 2).

  Patent Document 1 discloses a technique relating to a binding tool in which two rings each composed of a first binding shaft and a second binding shaft are provided in the longitudinal direction of a base member. The binding tool described in Patent Document 1 moves, for example, two first binding shafts provided in the longitudinal direction of the base member in directions close to each other in a state where the tips of the binding shafts are closed. The engagement state between the first binding shaft and the second binding shaft is released. Further, in the binding tool described in Patent Document 1, after the engagement state is released, the paper sheets are added or removed by moving the tips of the first binding shaft and the second binding shaft in the direction of separating them. It becomes possible. That is, in the binding tool described in Patent Document 1, the tips are engaged with each other in a state where the tips of the binding shafts are closed, and the first binding tool and / or the second binding in a direction different from the opening / closing direction. The binding tool is configured not to open unless the tool is moved. According to such a binding tool described in Patent Document 1, even when the weight of the bound paper sheets acts in a direction in which the first binding tool and the second binding tool are opened. The connection state between the two is maintained, and the paper sheets are prevented from falling off.

  Patent Document 2 discloses a technique related to a binding tool that includes an openable / closable ring for binding paper sheets and a lever for opening / closing the ring. In the technique described in Patent Document 2, an engagement portion is provided at the tip of the ring to prohibit the opening operation between the tip portions of the ring. This engaging part is comprised so that an engagement state may be cancelled | released by adding artificial elastic deformation.

JP 2003-211887 A International Publication No. 2005/035265 Pamphlet

  The above-described binding tool that engages the tip portions of the conventional rings disclosed in Patent Document 1 or Patent Document 2 (hereinafter also referred to as a conventional binding tool with an engagement function) is a ring. Before opening the tips, it is necessary to artificially release the engagement between the tips of the rings. Therefore, the following problems are pointed out in the conventional binding tool with an engagement function.

  The conventional binding tool with an engagement function is opened and closed as compared with the opening / closing operation of a binding tool that does not engage the tip portions of the ring that are generally widely used (hereinafter also referred to as a conventional binding tool without an engagement function). More steps are required for operation.

Moreover, the conventional binding tool with an engagement function forces the user to perform an opening / closing operation different from the conventional binding tool without an engagement function. On the other hand, the conventional binding tool without an engagement function and the conventional binding tool with an engagement function are difficult to distinguish the appearance of a general user. Therefore, a general user often tries to open and close a conventional binding tool with an engagement function by an opening / closing operation similar to that of a conventional binding tool without an engagement function.

  However, since the conventional binding tool with an engagement function does not open and close by the same operation, the user cannot open and close the conventional binding tool with an engagement function. At this point, the user recognizes that the opening / closing operations of these two binding tools (the conventional binding tool with the engagement function and the conventional binding tool without the engagement function) are different.

  Therefore, the user has to understand again the opening / closing operation of the conventional binding tool with an engagement function, and the time required for the work becomes longer. In some cases, the user may feel stressed.

  In particular, among conventional binding tools with an engagement function, a binding tool that opens and closes a ring by lever operation as disclosed in Patent Document 2 is a conventional engagement function that opens and closes a ring by lever operation. Difficult to distinguish from None binding tool. Therefore, since the user tries to open and close the ring by operating the lever, there is a possibility that an unexpected load is applied to the binding tool with the engagement function. For example, in a binding tool as disclosed in Patent Document 2, it is conceivable that a large load is applied to the base of the lever. Moreover, there is a concern that the lever will break when a larger force is applied. In addition, assuming such a problem, the strength of each member may be improved. However, when the strength of each member is improved, there is a concern that the weight of the binding tool increases and the amount of raw materials used for the binding tool increases.

  In the technique disclosed in Patent Document 2, after the user directly releases the engaged state by hand, the ring must be opened and closed using a lever. That is, there is a problem that the lever cannot be operated unless the user releases the engaged state while the ring can be opened and closed by the lever operation.

  The present invention has been made in view of the above problems, and a binding tool having an engaging portion that engages in a state in which tips of openable and closable rings for binding paper sheets are bound together. It is an object of the present invention to provide a technique related to a binding tool that can open and close a ring by an opening / closing operation substantially similar to a conventional binding tool that has no ring.

  A first binding tool according to the present invention is a binding tool connected to a cover of a file main body for binding paper sheets, and a base part connected to a cover of the file main body, and each connected to the base part. A ring portion provided with the first ring portion and the second ring portion, an engagement portion provided at the distal end portion of the first ring portion, and an engagement portion provided at the distal end portion of the second ring portion. The relative positions of the first ring part and the second ring part with respect to the base part are changed according to the engaged part to be engaged, the lever part rotatably connected to the base part, and the position of the lever part with respect to the base part A cam portion that is engaged with each other from a position corresponding to a closed ring posture in which the lever portion is engaged with the engaged portion. To the position corresponding to the open ring posture where paper can be inserted into and removed from the First, the first ring portion and the second ring portion are moved relative to each other in a direction in which the engagement portion and the engaged portion are engaged from the state where the engagement portion and the engaged portion are engaged. After that, the first ring part and the second ring part are relatively moved in a direction different from the relative movement direction to relatively separate the engaging part and the engaged part.

According to the above configuration, the user simply moves the lever, and the cam first moves the first ring portion and the second ring portion relative to each other in the disengagement direction according to the position of the lever with respect to the base.
Next, the two end portions can be moved relative to each other in a direction different from that direction.

  When changing the ring portion from the open ring posture to the closed ring posture, the user moves the lever in a direction opposite to the above, so that the cam first depends on the position (direction) of the lever with respect to the base. Move the first ring part and the second ring part relative to each other, and then move the first ring part and the second ring part closer to each other in a direction different from that direction. It can be moved and brought into contact, and the engaging portion and the engaged portion provided at the leading ends of both can be engaged. As a result, even if the first ring portion and the second ring portion are separated from each other, the engaging portion and the engaged portion restrict movement in the direction, and a direction (engagement different from the direction by the cam by the lever operation) If there is no movement of both rings in the release direction), they cannot move away from each other.

  In other words, in principle, both in the tangential direction of the first ring portion and the tip end portion of the second ring portion (the extension direction when projected onto the base portion, and appropriately described as “opening direction”). When the tip of the ring (engagement portion and engaged portion) moves relative to each other in a direction away from each other, the closed ring posture changes to the open ring posture. This is an engagement mechanism that restricts movement of the ring in the opening direction. Therefore, when the cam portion is changed from the closed ring posture to the open ring posture, first, the first ring portion and the second ring portion are in a direction different from the opening direction, and between the engaging portion and the engaged portion. Relative movement is performed in the direction of releasing the engagement (disengagement direction) to release the engaged state between the engaged portion and the engaged portion. Thereafter, the first ring portion and the second ring portion are relatively moved in a direction in which the engaging portion and the engaged portion are separated from each other in the opening direction. That is, the engagement mechanism by the engaging portion and the engaged portion is a catch that regulates the relative movement of the first ring portion and the second ring portion in the opening direction, and the cam portion is moved by the movement of the lever portion. Accordingly, after releasing the catch, the two ring portions are separated (from the open ring posture, the two ring portions are brought close to each other and then the tip portions are hooked to form a closed ring posture).

  In addition, what is necessary is just to move a 1st ring part and a 2nd ring part relatively as above-mentioned. Therefore, the position of the first ring portion does not move from the closed ring posture to the open ring posture, and only the second ring portion moves relative to the base portion, so that both rings are relatively engaged. The state may be shifted in the release direction and then shifted in the opening direction. In addition to this, various modes can be adopted, but for example, the following modes can also be adopted.

  That is, the ring portion is configured such that each of the first ring portion and the second ring portion includes a plurality of rings, and each ring of the first ring portion engages with a ring of a second ring portion different from each other, The ring portion is a first rotation shaft portion that connects the base side end portions of each ring and serves as a rotation center when the engagement portion moves relative to the engaged portion in a direction away from the engaged portion, A first pressing portion that is connected to the rotating shaft portion and pressed by the cam portion, and the second ring portion moves relative to the engaging portion in a direction in which the engaged portion is separated from the engaging portion. A second rotation shaft portion that connects the base side end portions of each ring, and a second pressing portion that is connected to the first rotation shaft portion and is pressed by the cam portion. The base portion holds the first rotation shaft portion for rotatably holding the first rotation shaft portion and the second rotation shaft portion for rotation. Provided between the second rotating shaft portion holding portion and the portion of the first rotating shaft portion that is not held by the first rotating shaft portion holding portion, and the portion is attached in a direction away from the base portion. Provided between the first biasing means for biasing and the portion of the second pivot shaft portion not held by the second pivot shaft holding portion, and biasing the spot in a direction away from the base portion. A second biasing means. The engaging portion and the engaged portion are engagement mechanisms that release the engaged state in the closed ring posture when one moves relative to the other along the substantially vertical direction of the base portion.

And the cam part is in the stage where the engagement of the engaging part and the engaged part is released from the closed ring posture, according to the position of the lever part with respect to the base part,
(1) The position of the first pressing portion with respect to the base is restricted to a position substantially the same as the position in the closed ring posture, and the second pressing portion is restricted so as to be farther from the base than the position in the closed ring posture.
(2) Whether the position of the first pressing portion with respect to the base is regulated so as to be closer to the base portion than the position in the closed ring posture, and the second pressing portion is regulated so as to be separated from the base rather than the position in the closed ring posture. ,
(3) The first pressing portion is regulated so as to be closer to the base portion than the position in the closed ring posture, and the position of the second pressing portion with the base is regulated to a position substantially the same as the position in the closed ring posture. In a stage where the joint portion and the engaged portion are not in contact with each other and then the engagement portion and the engaged portion are disengaged from the released state to the open ring posture, the pressing portions are separated from the base. To regulate.

  With this configuration, the user first engages the first ring portion and the second ring portion (the engaged portion and the engaged portion) by simply rotating the lever portion with respect to the base. Relative movement can be performed in the mating release direction, and after the engagement of the engaging portion and the engaged portion is released, both can be relatively moved in the opening direction.

  The first ring part and the second ring part are always urged by the urging means so as to always move relative to each other in the opening direction, and the moving force is regulated by the cam part. In this case, the user does not need to move both of the first ring part and / or the second ring part.

  Also, when changing from the open ring posture to the closed ring posture, the positions of the first ring portion and the second ring portion are regulated (defined) as described above. That is, the relative position of the first ring portion and the second ring portion is determined according to the position (rotation direction) of the lever portion with respect to the base portion, and after the relative movement from the closed ring posture to the disengagement direction, the release direction Relative movement to reach the open ring posture.

  In particular, when the cam portion is configured as in (2) above, when the engaging portion and the engaged portion are moved in the disengagement direction from the closed ring posture, the engagement is released from both positions in the closed ring posture. Each moving distance to the position to be moved can be shorter than that of the ring part on the moving side in the above (1) and (3).

  The first urging means and the second urging means may be separate but may be the same. The urging means may be in contact with at least one of the first rotation shaft portion and the second rotation shaft portion. The cam portion may be separate for the first pressing portion and for the second pressing portion, or may be an integral type formed by bonding separate members. Thus, the above configuration can be modified as appropriate. For example, the following configurations may be employed.

  A second binding tool according to the present invention is a binding tool connected to a cover of a file main body for binding paper sheets, and a base portion connected to a cover of the file main body, and connected to the base portion A first ring portion and a second ring portion, and the paper sheets are bound by the tips of the first ring portion and the second ring portion coming into contact with each other. A ring portion that forms a closed ring posture and forms an open ring posture that allows the sheets to be bound by separating the tip portions from each other, and each of the first ring portion and the second ring portion An engagement portion that engages the tip portions, and a lever portion that is pivotally connected to the base portion and switches the ring portion between the open ring posture and the closed ring posture. The lever portion is in a state where the ring portion is in a closed ring posture. When moved, at least one of the front end portion of the first ring portion and the front end portion of the second ring portion is moved in a direction to release the engagement state by the engagement portion, and the ring The tip of the first ring part and the tip of the second ring part are separated from each other at least one of the one tip part and the other tip part so that the part forms an open ring posture. And a cam portion that moves in the direction.

  According to this binding tool, by providing the engaging portion, it is possible to regulate the release of the contact state between the tip portions of the ring members. In other words, the closed ring posture of the ring portion is released due to an external impact or the weight of the bound paper sheets, and the paper sheets can be prevented from falling off. Further, according to the binding tool, by providing the cam portion, it is possible to release the engaged state by the engaging portion and switch from the closed ring posture to the open ring posture only by operating the lever portion. Moreover, according to this binding tool, by providing a cam part, a ring part can be opened and closed by lever operation substantially the same as the conventional lever type binding tool without an engagement function.

  In this binding tool, the cam portion of the first ring portion is configured such that when the lever portion is rotated in a state where the ring portion is in an open ring posture, the ring portion forms a closed ring posture. A direction in which one of the tip portions moved when forming the open ring posture is released from the engagement state after at least one tip portion of the tip portion and the tip portion of the second ring portion is approached. It is also possible to form a closed ring posture by changing in a direction opposite to the above. By configuring the cam portion as described above, by operating the lever portion, in addition to releasing the engaged state and switching from the closed ring posture to the open ring posture, switching from the open ring posture to the closed ring posture is performed. And the engagement by the engaging portion can be performed only by lever operation. As a result, the convenience of the binding tool can be further improved.

  A ring part is comprised by the 1st ring part and the 2nd ring part, a closed ring attitude | position is formed when front-end | tip parts contact, and an open ring attitude | position is formed when front-end | tip parts leave | separate. A ring part can comprise two ring members (a 1st ring part and a 2nd ring part) of a semi-circular shape as a pair, for example. In this case, the ring portion is substantially circular in the closed ring posture. Note that the shape of the ring portion is not particularly limited, and may be a D-shape in the closed ring posture.

  A plurality of ring portions can be arranged at predetermined intervals in the longitudinal direction of the base portion. The number of ring portions and the interval between the ring portions can be appropriately set based on the size of the paper sheets to be bound and the punch hole standard. A binding tool including three or more rings is also widely used. However, the conventional technology relating to a binding tool having an engagement function (for example, Japanese Patent Application Laid-Open No. 2003-211887 (Patent Document 1) and International Publication No. 2005/035265 (Patent Document 2)) has two rings. It was only supposed to have a binding tool with. Therefore, it is difficult to conceive of a binding tool having an engagement function including three or more rings based on the conventional technique related to a binding tool having an engagement function. Even if it is applied, it is assumed that the opening and closing of the ring is extremely difficult. This is because, in the techniques disclosed in Patent Document 1 and Patent Document 2, the ring is opened and closed by directly holding the ring in any case, regardless of whether it is operated with one hand or both hands. Therefore, when opening and closing the ring, it is necessary to grip all the rings even if there are three or more rings, but it is extremely difficult to perform the opening and closing operation by gripping all three or more rings. Because it is difficult. On the other hand, in the binding tool according to the present invention, the operation on the lever portion (movement of the lever portion) is converted into the opening / closing operation of the ring portion by the cam portion. Therefore, the ring portion can be opened and closed by operating the lever portion without being affected by the number of ring portions or the interval between the ring portions. That is, the binding tool according to the present invention can be very suitably used as a binding tool having a wide interval between ring parts or a binding tool provided with three or more ring parts.

  Further, for example, the binding tools disclosed in Patent Document 1 and Patent Document 2 have two rings, and these two rings are at a distance that allows the user to release the engagement state of both rings with one hand. Is provided. Therefore, if the distance between the two rings exceeds the range that can be operated with one hand of the user, the user cannot operate with one hand. When operation with one hand is not possible, the user will naturally operate with both hands, but when operated with both hands, a greater force is applied to the binding tool (ring) than when operating with one hand. Is concerned. As a result, it is necessary to improve the strength of each member constituting the binding tool. This binding tool eliminates such problems and eliminates the need to devise the design of a cam or the like so that the user's force given to release the engaged state can be used only for releasing the engaged state. The problem that the mechanism is complicated by this device is also prevented.

  In the binding tool, the ring portion includes an engaging portion that engages the tip portions with the tip portions of the first ring portion and the second ring portion. Thereby, each front-end | tip part is engaged, and cancellation | release of the contact state of this front-end | tip part can be controlled. The engaging portion can be configured to restrict movement of the distal end portion of the ring portion in the axial direction of the distal end portion. Here, the axial direction is the axial direction of the tip of the ring portion when the ring portion forms a closed ring posture. For example, the engaging part is configured such that a part of the tip part of the first ring part and a part of the tip part of the second ring part are overlapped, and an uneven part capable of engaging with each other is provided on the inner surface of the overlapped part. Can be formed.

  In addition, the uneven | corrugated | grooved part should just be able to regulate the movement to the said axial direction, ie, the direction which the front-end | tip parts of both ring parts leave | separate relatively. Therefore, the concavo-convex portion may be constituted by a groove provided in a direction substantially orthogonal to the axial direction and a protruding portion engaged with the groove. As described above, by providing the concave and convex portions on the inner side surfaces of the overlapping portions, the concave and convex portions are caught with each other, and the movement in the axial direction can be restricted. As a result, the contact state between the tip portions can be restricted from being released by an external impact or the like.

  When the ring portion is designed to have a large diameter so that a large amount of paper sheets can be bound, a particularly large force acts on both ring portions in the opening / closing direction due to the weight of the bound paper sheets. This large force causes the two ring portions to move apart, causing paper sheets to fall off, and applying a load to the opening / closing mechanism of the ring portion, causing failure of the mechanism. On the other hand, according to the present binding tool, since the uneven portion is provided, such a problem can be avoided.

  The base portion functions as a base for the binding tool. By connecting the base unit to the inner surface of the cover of the file body, the binding tool can be used as a file. In addition, the connection method of a base part and a cover is not specifically limited. By adopting a configuration in which the base part and the cover can be removed, it is possible to easily separate and dispose of the binding tool and the file body, or to replace parts when one of the parts is damaged. In the binding tool, the front cover includes a back cover, a front cover, and a back cover.

  The lever portion switches the ring portion between an open ring posture and a closed ring posture. According to the binding tool, it is possible to release the engaged state by the engaging portion and switch from the closed ring posture to the open ring posture by simply operating the lever portion. The lever portion includes a lever base end portion that is pivotally connected to a substantially center in the short direction of the base portion, and a free end portion for operation, and the ring portion is in a closed ring posture. When switching to the open ring posture, an open portion formed between the tip portions of the ring portion may be passed.

  A cam part changes the state of the said ring part by operation of a lever part. Specifically, when the lever portion is rotated in a state where the ring portion is in the closed ring posture, the cam portion is at least one of the tip end portion of the first ring portion and the tip end portion of the second ring portion. After the part is moved in a direction to release the engagement state by the engagement part, the tip part of the first ring part and the tip part of the second ring part are separated so that the ring part forms an open ring posture. As a result, it is possible to release the restriction by the engaging portion and to switch from the closed ring posture to the open ring posture. That is, the engagement state can be released and the state of the ring portion can be changed only by lever operation.

  This lever operation is substantially the same as a conventional lever-type binding tool having no engagement function. Therefore, a user who uses the binding tool for the first time can easily open and close the ring portion. Further, since the method of use is not known and the door is not forcibly opened and closed, damage to the member due to an unexpected load is prevented.

  That is, by operating the lever portion in the closed ring posture, the cam portion first releases the engagement state between the tips of the ring portions, so that the tip portion of the first ring portion and the tip portion of the second ring portion At least one of the first ring portion and the second ring portion is moved in a direction (engagement release direction) different from the direction in which the two are separated from each other (first stage). Then, by operating the lever portion after the engagement state is released, the cam portion moves in a direction (opening direction) in which the first ring portion and the second ring portion are separated (second stage).

  As described above, the cam portion is a mechanism that moves at least one of the first ring portion and the second ring portion. Thus, for example, one ring part is moved in the first stage and the other ring part is moved in the second stage, or both ring parts are moved in the first stage, and one ring is moved in the second stage. Various configurations such as a configuration in which only the ring portion is moved and a configuration in which both the ring portions are moved in both the first stage and the second stage can be employed. In either case, the cam portion of the binding tool can move the relative positional relationship between the rings as described above.

  Specifically, in the binding tool, when the lever portion is rotated in a state where the ring portion is in a closed ring posture, the cam portion includes a tip portion of the first ring portion and the second ring portion. One of the tip portions may be moved in a direction to release the engaged state by the engaging portion, and only the other tip portion may be moved in the separating direction. Further, in the binding tool, when the lever portion is rotated in a state where the ring portion is in a closed ring posture, the cam portion includes a tip portion of the first ring portion and a tip portion of the second ring portion. One of the tip portions is moved in a direction to release the engaged state by the engaging portion, then moved in the separating direction, and the one tip portion is moved in the direction to release the engaged state. In addition, the other tip may be moved in the separating direction.

  The direction in which the engagement state by the engagement portion is released may be a direction substantially orthogonal to the axial direction at the tip of the ring portion when the ring portion forms a closed ring posture. As described above, the engaging portion can be configured to restrict the distal end portion of the ring portion from moving in the axial direction at the distal end portion of the ring portion when the ring portion forms the closed ring posture. Therefore, in this binding tool, the restriction by the engaging portion is released by moving one of the tip portions in a direction substantially orthogonal to the axial direction. For example, the engaging part is formed by overlapping a part of the tip part of the first ring part and a part of the tip part of the second ring part, and providing an uneven part on the inner surface of the overlapped part. Can do. In this case, the engagement state by the engagement portion can be released by moving one of the tip portions in a direction orthogonal to the axial direction, in other words, in a protruding direction of the uneven portion provided on the inner surface. .

  Here, in the binding tool, the cam portion may be configured to include a cam portion that is connected to a proximal end portion of the lever portion and presses a part of the ring portion to open and close the ring portion. . In this case, the first ring portion is a first rotation shaft portion serving as a rotation center when the first ring portion opens and closes, and the first rotation shaft portion extends along the longitudinal direction of the base portion. And a first pressing portion connected to the first rotation shaft portion and pressed by the cam portion. The second ring portion is a second rotation shaft portion that becomes a rotation center when the second ring portion opens and closes, and is a second rotation shaft that is substantially parallel to the first rotation shaft portion. And a second pressing portion connected to the second rotating shaft portion and pressed by the cam portion. In this case, when the lever portion is rotated in a state where the ring portion is in a closed ring posture, the cam portion rotates around the first rotation shaft portion in a direction that forms the open ring posture. At least one of the front end portion of the first ring portion and the front end portion of the second ring portion that rotates about the second rotation shaft portion in a direction that forms the open ring posture. And move in a direction opposite to the direction in which the open ring posture is formed. Thereafter, the cam portion includes the tip portion of the first ring portion and the tip portion of the first ring portion and the tip portion of the second ring portion so that the ring portion forms an open ring posture. You may make it space apart the front-end | tip part of a two-ring part. Note that the opposite directions are directions in which the engagement portions are disengaged.

  The cam portion can be arranged so as to be connected to a base end portion of the lever portion and to be in contact with a part of the ring portion. Thereby, the force at the time of a lever part rotating is transmitted to a ring part, and opening / closing of a ring part is realizable. Since the cam portion presses the first pressing portion and the second pressing portion, it is preferable that the cam portion is provided at substantially the center in the short direction of the base portion. Therefore, it is preferable that the first pressing portion and the second pressing portion are also arranged at substantially the center of the base portion. The first pressing portion and the second pressing portion can be formed by bending the first rotating shaft portion and the second rotating shaft portion on the crank, respectively. The first rotation shaft portion and the second rotation shaft portion are preferably arranged at the same interval from the center in the short direction of the base portion. Thereby, the open part formed between the front-end | tip part of a 1st ring part and the front-end | tip part of a 2nd ring part can be formed above the center in the transversal direction of a base part. In addition, the 1st rotation shaft part and the 2nd rotation shaft part should provide the ring support part which supports these in the base part so that rotation is possible, and should just be supported by this ring support part. The direction opposite to the direction in which the ring posture is formed is, in other words, the direction in which the engaged state by the engaging portion is released. In this configuration, the cam portion rotates one of the rings that rotate about the rotation axis in the direction opposite to the direction of rotation when forming the ring posture, thereby releasing the engaged state.

  The cam portion applies the different pressing force to the first pressing portion and the second pressing portion when the lever portion is rotated in a state where the ring portion is in the closed ring posture, so that the first At least one of the tip of the ring portion and the tip of the second ring portion is in a direction opposite to the direction in which the open ring posture is formed, in the direction of releasing the engagement state of the engagement portion. You may make it move. Different pressing forces can be realized, for example, by providing a change between the shape of the portion that presses the first pressing portion and the shape of the portion that presses the second pressing portion in the cam portion. Thereby, due to the difference in the pressing force transmitted from the cam portion, a shift occurs in the movement of the tip portion of the ring portion, and the engaged state by the engaging portion can be released.

  Specifically, the cam portion may include a first cam portion that presses the first pressing portion and a second cam portion that presses the second pressing portion. In this case, the second cam portion can be configured such that the outer portion of the portion that presses the second pressing portion protrudes outside the outer portion of the portion that presses the first pressing portion of the first cam portion. . The cam portion applies a larger pressing force to the second pressing portion than the first pressing portion when the lever portion is rotated in a state where the ring portion is in a closed ring posture, and the second ring The tip of the part is moved in a direction opposite to the direction in which the open ring posture is formed.

  In the above invention, different pressing forces are applied by devising the shape of the cam portion, but the same effect can be obtained by devising the shape of the pressing portion. Therefore, for example, the second pressing portion may be formed such that the outer portion of the portion in contact with the cam portion protrudes toward the cam portion from the outer portion of the portion in contact with the cam portion in the first pressing portion. . Further, the cam portion includes the first pressing portion, a second pressing portion in which a portion in contact with the cam portion protrudes closer to the cam portion than an outer portion of a portion in contact with the cam portion in the first pressing portion, You may make it press. According to such a configuration, when the lever portion is rotated in a state where the ring portion is in a closed ring posture, a larger pressing force is applied to the second pressing portion than the first pressing portion, The distal end portion of the second ring portion can be moved in a direction opposite to the direction in which the open ring posture is formed, in a direction in which the engagement state of the engagement portion is released.

  Moreover, this binding tool is good also as a structure further provided with the urging | biasing part which urges | biases a part of this ring part so that the said ring part may form an open ring attitude | position. Examples of the ring portion include the first pressing portion and the second pressing portion described above. By energizing with a leaf | plate spring etc. from the lower side of a 1st press part and a 2nd press part, it can urge | bias so that a ring part may form an open ring attitude | position. In this case, the closed ring state can be maintained by pressing the first pressing portion and the second pressing portion downward by the cam portion. Then, for example, the ring portion can be changed to the open ring state by rotating the cam portion by rotating the lever portion to weaken or release the pressing force. Even when the urging portion is provided, when the lever portion is rotated in a state where the ring portion is in the closed ring posture, different pressing forces are applied to the first pressing portion and the second pressing portion. The tip portion of the first ring portion and the tip portion of the second ring portion can be moved in a direction opposite to the direction in which the open ring posture is formed.

  According to the binding tool according to the present invention described above, in a binding tool including a ring that can be opened and closed for binding paper sheets and a lever for opening and closing the ring, the opening and closing of the ring and the tips of the rings are connected to each other. It is possible to provide a technique relating to a binding tool that can be engaged and released by lever operation.

The perspective view of the binding tool of embodiment is shown. The disassembled perspective view of the binding tool of embodiment is shown. The top view of the binding tool of embodiment is shown. The back view of the binding tool of embodiment is shown. The side view of a 1st cam and a 2nd cam is shown. The front view of the closed ring attitude | position of a binding tool is shown. The 2nd cam side side view of the closing ring attitude | position of a binding tool is shown. The 1st cam side side view of the closing ring attitude | position of a binding tool is shown. It is a front view which shows the state by which the engagement state by the engaging part was cancelled | released. The 2nd cam side side view which shows the state by which the engagement state by the engaging part was cancelled | released is shown. The 1st cam side side view which shows the state by which the engagement state by the engaging part was cancelled | released is shown. The front view of the open ring attitude | position of a binding tool is shown. The 2nd cam side side view of the opening ring attitude | position of a binding tool is shown. The 1st cam side side view of the open ring attitude | position of a binding tool is shown. The surrounding enlarged view of the 2nd cam in the binding tool of the modification 1 is shown. The side view of the 1st cam in the binding tool of the modification 2 and a 2nd cam is shown.

  Next, an embodiment of a binding tool according to the present invention will be described with reference to the drawings.

(Constitution)
FIG. 1 shows a perspective view of the binding tool 1. FIG. 2 shows an exploded perspective view of the binding tool 1. FIG. 3 shows a plan view of the binding tool 1. FIG. 4 shows a back view of the binding tool 1. The binding tool 1 includes a base plate 2 connected to the inside of the spine of the file body 9, three rings 3a, 3b, 3c provided at predetermined intervals in the longitudinal direction of the base plate 2, and a ring 3a, The lever 4 operates to open and close 3b and 3c, and the cam 5 opens and closes the rings 3a, 3b and 3c in conjunction with the rotation of the lever 4. Note that the binding tool 1 of the present embodiment includes a closed ring posture for binding paper sheets (see FIG. 6A) and an open ring posture in which the middle of the rings 3a, 3b, and 3c is opened to add or remove the paper sheets. (See FIG. 8A). Details of each component will be described below.

  The base plate 2 includes a base main body 21, a plurality of ring support portions (rotation shaft portion holding portions) 22 that rotatably support the three rings 3a, 3b, and 3c, and a cam that rotatably supports the cam 5. It is comprised by the support part 7. FIG. Moreover, the base plate 2 of this embodiment is formed of a metal plate, and the base main body 21, the ring support portion 22, and the cam support portion 7 are integrally formed by punching.

  The base body 21 is formed of a rectangular metal plate. The dimensions of the base body 21 may be appropriately designed according to the type of paper sheets to be bound, the punch hole standard, and the like. In addition, the base main body 21 of this embodiment is designed so that it can respond to a three-hole type in which the distance between the rings is relatively wide.

  The ring support portion 22 rotatably supports the rotation shaft portions 35a, 36a and the like of the rings 3a, 3b, 3c (the one that supports the first ring is appropriately supported by the first rotation shaft portion holding portion, the second The one that supports the ring is referred to as a second rotating shaft holding portion.) The ring support portions 22 of the present embodiment are provided at four locations, in total, at eight locations, in the vicinity of both ends in the short direction of the base body 21. Each of these ring support portions 22 has the same shape, and is cut out into a rectangle leaving one side of the base body 21 at the position where the ring support portion 22 is provided. It is formed by bending so that the rotation shaft portions 35a, 36a and the like pass. Thereby, the ring support part 22 of this embodiment is formed integrally with the base main body 21.

  The cam support portion 7 rotatably supports the cam 5 to which the base end portion of the lever 4 is connected. The cam support portion 7 of the present embodiment is formed at the center of the base body 21 in the short direction so as to press the connecting portions 37a and 38a (details of the connecting portions will be described later) between the ring 3a and the ring 3b. Therefore, it is provided between the ring 3a and the ring 3b. In the present embodiment, the base main body 21 at the position where the cam support portion 7 is provided is cut out in a trapezoidal shape, and the remaining side (equivalent to the lower base of the trapezoid) is set at a substantially right angle as a base line. It is formed by raising. Note that the base line (the lower base of the trapezoid) coincides with the center line of the base body 21 in the short direction. In addition, a through-hole 23 into which the fixing pin 72 is inserted so as to be able to turn the cam 5 is provided in the upper portion of the raised plate-like cam support portion 7. As described above, the cam support portion 7 of the present embodiment is formed integrally with the base body 21 in the same manner as the ring support portion 22. Further, the cutout portion 71 that has been cut out functions as a retreat area of the connection portion 38a when the connection portion 38a is pressed and sinks.

  Next, the rings 3a, 3b, and 3c will be described. Since the structures of the rings 3a, 3b, and 3c are basically the same, only the ring 3a will be described as an example. The ring 3a is composed of a first semi-circular metal ring 31a and a second ring 32a. The ring 3a of the present embodiment is formed substantially symmetrically so that the front end of the first ring 31a and the front end of the second ring 32a are located at the approximate center in the short direction of the base plate 2 in the closed ring posture. Designed to. In addition, it becomes possible to close more paper sheets by enlarging the diameter formed inside the ring 3a. The shape of the ring 3a is not particularly limited, and may be D-shaped in the closed ring posture.

  An engaging portion 33a is provided at the tip of the first ring 31a, and an engaged portion 34a is provided at the tip of the second ring 32a (see FIG. 3). As shown in the figure, the engaging portion 33a and the engaged portion 34a are partially cut out in the vertical direction so that they overlap each other in the closed ring posture. A protrusion and a groove are formed on the inner surface of each of the engaging portions 33a and 34a so as to restrict the movement of the tip portion in the axial direction, that is, the upward direction of the drawing. Specifically, a groove is provided in the engaged portion 34a at a position facing the protrusion of the engaging portion 33a, and a protrusion is provided in the engaged portion 34a at a position facing the groove of the engaging portion 33a. ing. Thereby, each protrusion and groove | channel are hooked and the movement to an axial direction is controlled. As a result, it is possible to prevent the paper sheets from dropping off even when the amount of paper sheets to be bound is increased or when some impact is applied from the outside.

  Rotating shaft portions 35a and 36a that are central axes when the rings open and close are connected to the base end portions of the first ring 31a and the second ring 32a. The rotation shaft portion 35a and the rotation shaft portion 36a are parallel to each other. The rotation shaft portion 35a is formed by bending the base end portion of the first ring 31a at a substantially right angle. Further, the rotation shafts 35b and 36b are connected to the rings 3b and 3c, respectively. That is, the rotation shaft portion 35b is connected to the base end of the first ring 31b of the ring 3b, and the rotation shaft portion 35c is connected to the base end of the first ring 31c of the ring 3c.

  The rotation shaft portions 35b and 35c are located on the same axis as the rotation shaft portion 35a. On the other hand, the rotation shaft portion 36a is formed by bending the base end portion of the second ring 32a at a substantially right angle. A rotation shaft portion 36b is connected to a base end portion of the second ring 32b of the ring 3b, and a rotation shaft portion 36c is connected to a base end portion of the second ring 32c of the ring 3c. The rotation shaft portions 36b and 36c are located on the same axis as the rotation shaft portion 36a. These rotation shaft portions 35a and the like are rotatably supported by the ring support portion 22 so that the rings 3a, 3b, and 3c can be opened and closed.

  The rotating shaft portion 35a and the rotating shaft portion 35b are connected by a crank-shaped connecting portion 37a, and the rotating shaft portion 35b and the rotating shaft portion 35c are similarly connected by a crank-shaped connecting portion 37b. Thereby, the first rings 31a, 31b, and 31c can be integrally opened and closed when the rings 3a, 3b, and 3c are opened and closed. Further, the rotating shaft portion 36a and the rotating shaft portion 36b are connected by a crank-shaped connecting portion 38a, and the rotating shaft portion 36b and the rotating shaft portion 36 are similarly connected by a crank-shaped connecting portion 38b. . Thereby, the second rings 32a, 32b, and 32c can be integrally opened and closed when the rings 3a, 3b, and 3c are opened and closed.

  The connecting portions 37 a and 38 a are in contact with the cam 5 and the leaf spring 6 in addition to connecting the rotating shaft portions as described above. The connecting portions 37a and 38a correspond to the first pressing portion and the second pressing portion, and the leaf spring 6 corresponds to the urging means. The connecting portions 37 a and 38 a are formed by being bent in a crank shape toward the center of the base plate 2 so that the central portions thereof can come into contact with the cam 5 disposed at the center of the base plate 2. The connecting portions 37 a and 38 a are adjacent to each other in the center portion of the base plate 2 in parallel with each other, and can contact the cam 5. In the present embodiment, the connecting portions 37b and 38b are also configured in the same shape as the connecting portions 37a and 38a. Accordingly, for example, a cam and a lever can be provided between the ring 3b and the ring 3c. However, in the case where the opening / closing operation is performed by one lever 4 as in the present embodiment, the connecting portions 37b and 38b may be simply linear.

  The leaf spring 6 biases the connecting portions 37a, 37b upward so that the rings 3a, 3b, 3c form an open ring posture. The leaf spring 6 of the present embodiment is formed of a metal plate and is designed so that the width gradually decreases from the base end portion 61 toward the tip end portion 62. The leaf spring 6 is inserted into an elongated through hole 23 provided in the base body 21 of the base plate 2. More specifically, the leaf spring 6 is inserted from the back surface of the base body 21, the base end portion 61 is fixed on the back surface side of the base body 21, and the distal end portion 62 is in contact with the connecting portions 37 a and 38 a. The base body 21 is curved toward the center. Thereby, a restoring force acts on the leaf spring 6, and it is possible to urge the connecting portions 37a and 38a upward.

  The cam 5 comes into contact with the connecting portions 37a and 38a, and changes the rings 3a, 3b, and 3c from the closed ring posture to the open ring posture or from the open ring posture to the closed ring posture by operating the lever 4. The cam 5 of the present embodiment is formed of a synthetic resin and includes a first cam 51 that presses the connecting portion 37a and a second cam 52 that presses the connecting portion 38a. The first cam 51 and the second cam 52 have different outline shapes. As a result, when the first cam 51 and the second cam 52 are simultaneously rotated by rotating the lever 4, different pressing forces are applied to the connecting portion 37a and the connecting portion 38a, and the rings 3a, 3b, 3c Deviation occurs in the movement between the tip portions, and the engaged state of the engaging portions 33a and 34a can be released. In other words, when the state is changed by the cam 5 from the closed ring posture to the open ring posture, the first rings 31a, 31b, 31c are controlled to move away from the second rings 32a, 32b, 32c, The rings 32a, 32b, and 32c are controlled so as to be separated from the first rings 31a, 31b, and 31c after being once pushed down toward the base plate 2 from the position in the closed ring posture.

  Here, FIG. 5 shows a side view of the first cam and the second cam. The first cam 51 includes a first contact portion 511 that contacts the connecting portion 37a in the closed ring posture, a second contact portion 512 that contacts the connecting portion 37a in the open ring posture, and a change from the closed ring posture to the open ring posture. And a third contact portion 513 that contacts the connecting portion 37a at the time of the change from the open ring posture to the closed ring posture.

  The first contact portion 511 restricts the connecting portion 37a from being lifted by the urging force of the leaf spring 6 in the closed ring posture, so that the rings 3a, 3b, and 3c are not opened. That is, the first contact portion 511 restricts the rings 3a, 3b, and 3c to the position of the closed ring posture. The first contact portion 511 has a region that is recessed on the axial side of the fixing pin 72, and is configured such that the protruding portion of the connecting portion 37a is accommodated in the recessed region. Thereby, it can control that the 1st cam 5 rotates automatically from a closed ring posture state.

  The outer surface of the third contact portion 513 is designed to be smaller than that of the first contact portion 511. Therefore, the force with which the third contact portion 513 presses the connecting portion 37a is weaker than the force with which the first contact portion 511 presses the connecting portion 37a. As a result, the connecting portion 37a is pushed upward by the urging force of the leaf spring 6, and the tip portions of the first rings 31a, 31b, 31c are lifted upward. The third contact portion 513 is configured by a curved portion that is provided between the first contact portion 511 and the second contact portion 512 and bulges outward. Thereby, the transition from the closed ring posture to the open ring posture or the transition from the open ring posture to the closed ring posture can be performed smoothly.

  The second contact portion 512 is formed such that the distance from the axial center of the fixed pin 72 to the second contact portion 512 is shorter than the distance from the fixed pin 72 to the first contact portion 511. As a result, the closed ring posture is released, and an open ring posture is formed in which an open portion is formed between the tips of the rings 3a, 3b, and 3c.

  Since the first cam 51 has the above-described configuration, when the rings 3a, 3b, and 3c are changed from the closed ring posture to the open ring posture, the positions of the tips of the first rings 31a, 31b, and 31c are changed to the closed ring posture. Are sequentially moved away from the positions engaged with the second rings 32a, 32b, 32c. In addition, since the shape of the first cam 51 is designed in the above-described shape (see FIG. 5), the first cam 51 is moved from the position of the closed ring posture to the position of lifting once with the base plate 2 as a reference, to the position of the open ring posture. Move. The reason why the tips of the first rings 31a, 31b, and 31c are once moved upward in this manner is that an upward force by the leaf spring 6 acts on the connecting portion 37a.

  Similarly to the first cam 51, the second cam 52 is also in contact with the connecting portion 38a in the closed ring posture, the second contact portion 522 in contact with the connecting portion 38a in the closed ring posture, and the closed ring posture. A third contact portion 523 that comes into contact with the connecting portion 38a at the time of change to the open ring posture or at the time of change from the open ring posture to the closed ring posture is provided. The first contact portion 521 is also provided with a region in which the protrusion 38a1 of the connecting portion 38a can be accommodated.

  Thus, the first cam 51 and the second cam 52 have the same function, but the distance X2 from the axis of the fixing pin 72 to the third contact portion 523 in the second cam 52 is the first cam 51. It is designed to be longer than the distance X1 from the axis of the fixing pin 72 to the third contact portion 513. That is, the outline of the third contact portion 523 in the second cam 52 is formed so as to protrude outward from the outline of the third contact portion 523 in the first cam 51. Accordingly, when the cam 5 rotates when changing from the closed ring posture to the open ring posture, the second cam 52 applies a downward pressing force larger than that of the first cam 51 to the connecting portion 38a. Thus, the connecting portion 38a sinks downward relative to the connecting portion 37a.

  As a result, different movements occur between the first ring 31a and the second ring 32a at the tips of the rings 3a, 3b, and 3c. That is, the tip of the second ring 32a sinks downward in conjunction with the sinking of the connecting portion 38a, and the tip of the first ring 31a rises in conjunction with the upward lifting of the connecting portion 37a. Float in the direction. As a result, a shift occurs between the tip of the first ring 31a and the tip of the second ring 32a, and the engaged state between the engaging portion 33a and the engaged portion 34a is released.

  In the present embodiment, since the first cam 51 and the second cam 52 are designed as described above, the first rings 31a, 31b, 31c are lifted upward, and the second rings 32a, 32b, 32c are Sinks downward. Therefore, the engagement state between the tips of the rings 3a, 3b, and 3c can be released extremely reliably. Further, the amount of vertical movement of each ring can be reduced as compared with the case where only the tip of one of the rings is moved up and down.

  The lever 4 switches the rings 3a, 3b, and 3c between an open ring posture and a closed ring posture. The lever 4 is made of a metal member, and includes a base end portion 41 that is rotatably connected to the cam support portion 7 by a fixing pin 72, and a free end portion 42 for operation. The base end portion 0 of the lever 4 is fixed to the cam 5, and the cam 5 rotates in conjunction with the rotation of the lever 4.

(how to use)
Next, the usage method of the binding tool 1 of embodiment mentioned above is demonstrated based on drawing together with operation | movement of each structure.

  The binding tool 1 of the embodiment can be used in a state of being fixed to the inner surface of the cover of the file body 9 (see FIG. 1). The binding tool 1 has a closed ring posture (see FIGS. 6A, 6B, and 6C) in which the first rings and the second rings of the rings 3a, 3b, and 3c come into contact with each other, and the tips of the rings 3a, 3b, and 3c. An open ring posture (see FIGS. 8A, 8B, and 8C) can be taken. When storing paper sheets on a shelf, etc., it is used in a closed ring position, and when binding documents or inserting / removing bound documents, it is used in an open ring position. The

  The binding tool 1 of the present embodiment can perform the operation from the closed ring posture to the open ring posture or the operation from the open ring posture to the closed ring posture by operating the lever 4. Further, the binding tool 1 of the present embodiment is provided with engaging portions 31a, 31b, 31c at the tip of the first ring of the rings 3a, 3b, 3c, and 32a, 32b, 32c at the tip of the second ring. The connection state between the tip portions can be restricted from being released, but the engagement state by the engagement portion can also be released by operating the lever 4.

  FIG. 6A shows a front view of the closed ring posture of the binding tool 1. FIG. 6B shows a side view of the second cam side in the closed ring posture of the binding tool 1. FIG. 6C shows a side view of the first cam side in the closed ring posture of the binding tool 1.

  In the closed ring posture, the free end 42 of the ring lever 4 is parallel to the base plate 2. Further, the leaf spring 6 pushes the connecting portions 37a, 38a upward so that the rings 3a, 3b, 3c form an open ring posture. On the other hand, the cam 5 (the first cam 51 and the second cam 52) presses the connecting portions 37a and 38b downward (regulates movement), and the closed ring posture is maintained. More specifically, the first contact portion 511 of the first cam 51 presses the connecting portion 37a downward. Further, the first contact portion 521 of the second cam 52 presses the connecting portion 38a downward.

  It should be noted that protrusions 37a1 and 38a1 provided in the connecting portions 37a and 38a are provided in the recessed regions provided in the first contact portion 511 of the first cam 51 and the first contact portion 521 of the second cam 52, respectively. It is settled. Further, the engagement of the engaging portions 33a, 34a and the like provided on the rings 3a, 3b, 3c, respectively, restricts the tips from separating from each other.

  When binding paper sheets or taking out paper sheets that have already been bound, the levers 4 are operated to change the rings 3a, 3b, 3c to the open ring posture. The lever 4 is gripped and the free end 42 of the lever 4 is lifted upward. As a result, the cam 5 is rotated in conjunction with the rotation of the lever 4, and the tips of the first rings 31a, 31b, 31c are above the second rings 32a, 32b, 32c (in a direction away from the base body 9). And the tips of the second rings 32a, 32b, and 32c move downward (moving in the disengagement direction respectively) from the first rings 31a, 31b, and 31c, and the engaging portion 33a and the engaged portion The engaged state such as 34a is released. This will be described in more detail with reference to FIGS. 7A to 7C.

  FIG. 7A is a front view showing a state in which the engagement state by the engagement portions 33a, 34a and the like is released. FIG. 7B is a side view of the second cam side showing a state in which the engaged state by the engaging portions 33a, 34a and the like is released. FIG. 7C is a side view of the first cam side showing a state in which the engagement state by the engagement portions 33a, 34a and the like is released.

  When the free end portion 42 of the lever 4 is lifted upward, the cam 5 rotates in conjunction with this. Although the first cam 51 and the second cam 52 rotate simultaneously, as described above, the outline of the third contact portion 523 in the second cam 52 is formed larger than the outline of the third contact portion 513 in the first cam 51. Has been. Accordingly, the first cam 51 and the second cam 52 are rotated simultaneously, but the third contact portion 523 of the second cam 52 is lower than the third contact portion 513 of the first cam 51 (on the base body 9 side). ) Will be located. As a result, a downward pressing force stronger than that of the connecting portion 37a with which the first cam 51 contacts is applied by the third contact portion 523 of the cam 2 to the connecting portion 38a with which the second cam 52 contacts. Will sink more than the connecting portion 37a. That is, the connecting portion 38a is retracted to the cutout portion 23 formed in the base body 21 immediately below the connecting portion 38a. As described above, when the connecting portion 38a sinks downward, the tip end portion of the first ring 32a connected via the rotating shaft portion 36a also sinks downward.

  On the other hand, the third contact portion 523 of the second cam 52 is positioned above the third contact portion 513 of the first cam 51. Further, an upward biasing force by the leaf spring 6 acts on the connecting portion 37a. Accordingly, the connecting portion 37 a with which the first cam 51 comes into contact is pushed upward by the urging force of the leaf spring 6. As a result, the engaging portion 33a and the engaged portion 34a are displaced in the vertical direction, and the engaging states of the engaging portions 33a and 34a are released.

  If the lever 4 is further lifted upward after the engaged state is released, the downward pressing force applied to the connecting portions 37a and 38a by the cam 5 is weakened. As a result, an open portion is formed between the first ring and the tip of the second ring of the rings 3a, 3b, and 3c by the biasing force of the leaf spring 6. That is, an open ring posture is formed. This will be described in more detail with reference to FIG.

  FIG. 8A shows a front view of the opening ring posture of the binding tool 1. FIG. 8B is a side view of the second cam side of the opening ring posture of the binding tool 1. FIG. 8C shows a side view of the first cam side of the opening ring posture of the binding tool 1. When the lever 4 is further lifted upward after the engaged state is released, the lever 4 passes through an open portion formed between the tip portions of the ring 3a, thereby forming an open ring posture. In the open ring posture, the lever 4 is substantially orthogonal to the base plate 2. Further, as described above, the cam 5 also rotates in conjunction with the rotation of the lever 4. As a result, in the cam 5, the second contact portion 512 of the first cam 51 presses the connecting portion 37a, and the second contact portion 522 of the second cam 52 presses the connecting portion 38a.

The second contact portions 512 and 522 are formed with a smaller outer contour than the first contact portions 511 and 521, and the pressing force applied to the connecting portions 37a and 38a is weak, and the engaging portions 33a and 34 are provided.
Since the engagement state such as “a” is released, the connecting portions 37 a and 38 a are pushed upward by the urging force of the leaf spring 6. As a result, the rings 3a, 3b, and 3c rotate about the rotation shaft portions 35a and 36a, etc., and an open portion is formed between the tips of the rings 3a, 3b, and 3c. That is, an open ring posture is formed.

  In the case of changing from the open ring posture to the closed ring posture, if the lever 4 in the open ring posture is rotated in the direction opposite to the above, the cam 5 acts on the first ring and the second ring in the reverse order. Therefore, after the first ring and the second ring move in the opposite direction to the opening direction and become the state shown in FIGS. 7A to 7C, the first ring and the second ring move in the opposite direction to the disengagement direction, respectively. The state shown in FIG. 6C (closed ring posture) is obtained.

(effect)
According to the binding tool 1 described above, by providing the engaging portions 33a, 34a, etc., the contact state between the tips of the rings 3a, 3b, 3c is released by an external impact or the weight of the paper sheets. The paper sheets can be prevented from falling off. Further, according to the binding tool 1, by providing the cam 5, simply by operating the lever 4, the engagement state can be released by the engagement portions 33 a and 34 a and the change from the closed ring posture to the open ring posture, Alternatively, the change from the open ring posture to the closed ring posture can be performed. Further, according to the binding tool 1, by providing the cam 5, the ring can be opened and closed by a lever operation substantially similar to that of a conventional lever-type binding tool having no engagement function.

(Modification 1)
FIG. 9 is an enlarged view of the periphery of the second cam in the binding tool 1 of the first modification. A dotted line indicates the outline of the second cam 52 of the above-described embodiment. In the above-described embodiment, in the cam 5, the outer contour of the third contact portion 523 of the second cam 52 is made larger than the outer contour of the third contact portion 513 of the first cam 51, so that the engaging portions 33a, 34a, etc. Realized the release. On the other hand, in the binding tool 1 of the modified example, the outer contour of the third contact portion 523 is configured in the same manner as the first cam 51 and the second cam 52, and the first contact portion 521 of the second cam 52 is depressed. The projecting portion 38 a 1 provided in the connecting portion 38 a that contacts the second cam 5 is formed higher than the protruding portion provided in the connecting portion 37 a that contacts the first cam 51. ing. In the binding tool 1 of the modified example, the third contact portion 523 of the second cam 52 must get over the protrusion 38a1 higher than the third contact portion 513 of the first cam 51 when changing from the closed ring posture to the open ring posture. I must. As a result, the pressing force of the second cam 52 against the connecting portion 38 a of the third contact portion 523 exceeds the pressing force of the first cam 51 against the connecting portion 37 a of the third contact portion 513. Accordingly, the connecting portion 38a sinks downward, and the engaging portions 33a and 34a can be released from the engaged state.

(Modification 2)
In the movement of the rings 3a, 3b, 3c from the closed ring posture to the open ring posture, the tips of the first rings 31a, 31b, 31c move in the direction away from the second rings 32a, 32b, 32c (opening direction), The direction in which the tips of the two rings 32a, 32b, 32c are moved away from the tips of the first rings 31a, 31b, 31c after moving once in the direction in which the tips of the first rings 31a, 31b, 31c are pushed down (approaching the base plate 2) (Moving direction) may be used. That is, even if it does not comprise so that the front-end | tip of the 1st rings 31a, 31b, and 31c may be moved to the upper direction, there exists the said equivalent effect | action. In this case, the first cam 51 is designed so that the tips of the first rings 31a, 31b, 31c move upward. On the other hand, what is necessary is just to design the 2nd cam 52 so that the front-end | tip of 2nd ring 32a, 32b, 32c may move to the opening direction.

  Here, FIG. 10 shows a side view of the first cam and the second cam in the binding tool of the second modification. In the binding tool of Modification 2, the distance X1 from the axial center of the fixed pin 72 to the third contact portion 513a of the third contact portion 513a of the first cam 51a is from the axial center of the fixed pin 72 to the first contact portion 511a. It is designed to have the same length as the distance X3. Thereby, when the cam 5 is rotated, the first contact portion 511a and the third contact portion 513a press the contact portion 37a with substantially the same force. That is, as in the above-described embodiment, the contact portion 37a is restricted from being lifted upward by the urging force of the leaf spring 6. The second cam 52 may be designed in the same manner as in the above-described embodiment. A circle (dotted line) in FIG. 10 is a virtual circle centered on the fixed pin 72 and indicates that the lengths of X1 and X3 are equal.

  As mentioned above, although preferred embodiment of this invention was described, the binding tool which concerns on this invention is not restricted to these, It can include these combinations as much as possible. For example, in the above-described embodiment, the engagement state is released by moving the tips of the rings 3a, 3b, and 3c in the vertical direction. However, for example, the shape of the cam 5 and the mechanism of the connecting portion between the cam 5 and the rings 3a, 3b, and 3c are appropriately designed, and the disengagement direction of the tips of the rings 3a, 3b, and 3c is different from that in the above embodiment. After moving in the direction of the base plate (for example, in the longitudinal direction of the base plate), both rings may be moved in the direction of forming the open ring posture. For example, a spring different from the leaf spring 6 is provided in the base portion main body 9 to urge the second ring in the longitudinal direction of the base portion main body 9, and the second rotation shaft portion holding portion is the second rotation shaft portion (second ring The disengagement direction is defined as above by holding the second rotating shaft portion so as to allow movement in the above direction, and by configuring and shaping the cam 5 to also restrict movement in the above direction. Can be in different directions.

  In the above-described embodiment, both the first rings 31a, 31b, and 31c and the second rings 32a, 32b, and 32c are moved. However, only one of the rings may be moved. That is, one ring (for example, the first rings 31a, 31b, 31c) is fixed to the base plate 2, and only the other ring (for example, the second rings 32a, 32b, 32c) is moved from the closed ring posture to the disengagement direction. It can also be configured to move in the open ring posture direction after moving.

  Further, when the ring moves from the closed ring state to the open ring state, the tip of one ring (for example, the first rings 31a, 31b, 31c) is configured to always move only in the open ring direction, You may comprise so that the front-end | tip part of a ring (for example, 2nd ring 32a, 32b, 32c) may move only to a disengagement direction. Further, for example, the shape of the cam 5 may be devised so that the other ring moves to the open ring state after the tip of one ring moves in the disengagement direction. Further, for example, when the lever 5 is rotated with the cam 5 in a state where the ring is in the closed ring posture, the tip end portion of one ring and the tip end portion of the other ring are engaged. After moving in the releasing direction, it may be moved in the separating direction, and the one tip may be moved in the engaged releasing direction and the other tip may be moved away. Also in this case, the same operation and effect as the binding tool of the above-described embodiment can be obtained.

(Another example)
In the case of a configuration in which the connecting portions 37a and 38a are pressed to sink to the base body 21 side, in other words, in a configuration in which the connecting portions 37a and 38a move to the base body 21 side, the base body 21 moves the connecting portions 37a and 38a. The position corresponding to the direction may be recessed from other regions or cut out. The recessed area or the notched area functions as a retracting area for the connecting portions 37a and 38a. As a result, the movable area of the connecting portions 37a and 38a can be made larger.

  Moreover, the freedom degree of design around the cam 5 can be improved by widening the space | interval of the connection part 37a and the connection part 38a, in other words, the space | interval when the connection part 37a and the connection part 38a approached most. Further, by widening the interval between the connecting portion 37a and the connecting portion 38a, the interval between the tip portions of the rings 3a, 3b, 3c in the open ring posture in which the tip portions of the rings 3a, 3b, 3c are separated from each other can be increased. As a result, it becomes easier to bind and take out paper sheets. In addition, when it is set as the structure which expands the space | interval of the connection part 37a and the connection part 38a, it is necessary to design wide so that each of the 1st cam 51 and the 2nd cam 52 can press the connection parts 37a and 38a.

DESCRIPTION OF SYMBOLS 1 ... Binding tool 2 ... Base plate 3a, 3b, 3c ... Ring 4 ... Lever 5 ... Cam 7 ... Cam support part 21 ... Base main body 22 ... Ring support part 31a, 31b, 31c ... 1st ring 32a, 32b, 32c ... 2nd ring 35a, 35b ... rotating shaft part 37a, 38a ... connection part 41 ... base end part 42 ...・ Free end 51 ... first cam 52 ... second cam

Claims (3)

A binding tool connected to the cover of the main file body for binding paper sheets,
A base portion that is connected to the cover of the file body,
A ring part comprising a first ring part and a second ring part respectively connected to the base part;
An engaging portion provided at the tip of the first ring portion;
Provided at the distal end portion of the second ring portion, and the engaged portion to be engaged with the engaging portion,
A lever part rotatably connected to the base part;
A cam portion for changing a relative position of the first ring portion and the second ring portion with respect to the base portion according to the position of the lever portion with respect to the base portion;
Cams section,
From the position corresponding to the closed ring posture in which the engaging portion and the engaged portion are engaged, the lever portion with respect to the base portion is opened so that the paper sheets can be inserted into and removed from the ring portion when they are engaged. When moving continuously to the position corresponding to the ring posture ,
First, the relative positional relationship between the first ring portion and the second ring portion is changed so that the engagement between the engaging portion and the engaged portion is released from the closed ring posture so that the engagement between the two is released. And
After that, the relative positional relationship between the first ring part and the second ring part is changed in the direction in which both are separated, and the first ring part and the second ring part are formed so as to face the open ring posture,
The direction of transition of the relative positional relationship between the first ring portion and the second ring portion is different when the engagement between the two is released and when the first ring portion and the second ring portion are in the open ring posture. <br/> Binding tool. The ring part
Each of the first ring part and the second ring part includes a plurality of rings, and each ring of the first ring part is configured to engage with a ring of a second ring part different from each other,
The first ring part
A first rotation shaft portion that connects the base side end portions of each ring, which serves as a rotation center when the engagement portion moves relative to the engaged portion in a direction away from the engagement portion;
Is connected to the first rotating shaft portion, anda first pressing portion to be pressed by the cams unit,
The second ring part
A second rotation shaft portion that connects the base side end portions of each ring, which serves as a rotation center when the engaged portion moves relative to the engagement portion in a direction away from the engagement portion;
A second pressing portion connected to the second rotating shaft portion and pressed by the cam portion,
The base part
A first rotating shaft holding portion that rotatably holds the first rotating shaft portion;
A second rotation shaft portion holding portion for rotatably holding the second rotation shaft portion;
A first urging means provided between the first rotation shaft portion and the portion not held by the first rotation shaft portion holding portion, and urging the portion in a direction away from the base portion;
A second urging means provided between the second rotating shaft portion and the portion not held by the second rotating shaft portion holding portion, and urging the portion in a direction away from the base portion. And
The engaging part and the engaged part are
An engagement mechanism in which the engagement state in the closed ring posture is released by one of the base portions moving relative to the other along the substantially vertical direction;
The cam part
In the stage where the engagement portion and the engaged portion are disengaged from the closed ring posture, the position of the first pressing portion with the base is substantially the same as the position in the closed ring posture according to the position of the lever portion with respect to the base portion. It is restricted to the same position, or restricted so that it is closer to the base part than the position in the closed ring posture, and the second pressing part is restricted to be separated from the base than the position in the closed ring posture. The engagement portion is not in contact, and each pressing portion is regulated so as to be separated from the base in a stage from the state where the engagement of the engagement portion and the engaged portion is released to the open ring posture. Item 1. A binding tool according to item 1. The ring part
Each of the first ring part and the second ring part includes a plurality of rings, and each ring of the first ring part is configured to engage with a ring of a second ring part different from each other,
The first ring part
A first rotation shaft portion that connects the base side end portions of each ring, which serves as a rotation center when the engagement portion moves relative to the engaged portion in a direction away from the engagement portion;
A first pressing portion connected to the first rotating shaft portion and pressed by the cam portion,
The second ring part
A second rotation shaft portion that connects the base side end portions of each ring, which serves as a rotation center when the engaged portion moves relative to the engagement portion in a direction away from the engagement portion;
A second pressing portion connected to the second rotating shaft portion and pressed by the cam portion,
The base part
A first rotating shaft holding portion that rotatably holds the first rotating shaft portion;
A second rotation shaft portion holding portion for rotatably holding the second rotation shaft portion;
A first urging means provided between the first rotation shaft portion and the portion not held by the first rotation shaft portion holding portion, and urging the portion in a direction away from the base portion;
A second urging means provided between the second rotating shaft portion and the portion not held by the second rotating shaft portion holding portion, and urging the portion in a direction away from the base portion. And
The engaging part and the engaged part are
An engagement mechanism in which the engagement state in the closed ring posture is released by one of the base portions moving relative to the other along the substantially vertical direction;
Cams section,
In a stage where the engagement portion and the engaged portion are released from the closed ring posture, the first pressing portion is closer to the base portion than the position in the closed ring posture according to the position of the lever portion with respect to the base portion. restricted to the position of the base of the second pressing portion is regulated to substantially the same position as in the closed ring postures, a state in which the engaging portion and the engaged portion do not contact the engaging portion and the engaged The binding tool according to claim 1, wherein each pressing portion is regulated so as to be separated from the base in a stage from a state where the engagement of the portions is released to an open ring posture.

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