Loose-leaf notebook

Abstract

The utility model relates to a loose-leaf notebook which comprises a clamp and a cover, the clamp comprises at least one group of first clamping jaw and second clamping jaw, the first clamping jaw and the second clamping jaw can be correspondingly closed or separated, and the clamp is located on the outer side of the cover and connected with the cover. The first clamping jaw and the second clamping jaw extend into the cover and are used for fixing punched paper. According to the loose-leaf notebook, the clamp is arranged on the outer side of the cover and cannot be stacked below the loose-leaf paper in the cover, hands are prevented from being hurt during writing, the loose-leaf paper is directly laid on the cover when being unfolded, the loose-leaf paper is flat and cannot be suspended, and the experience feeling is good.

Description

Technical Field

[0001] The utility model relates to the technical field of stationery, more specifically to a loose-leaf notebook. Background Art

[0002] Loose-leaf books can be easily added or deleted, and are very popular among the public. The clamps of loose-leaf books on the market are all connected and locked with claws on both sides. When replacing the loose-leaf core or adding or reducing loose-leaf paper, you need to press the locking claws on both sides of the clamp to unlock it, which is not very convenient. In addition, in order to facilitate writing, loose-leaf books are generally provided with a harder cover. The clamps of loose-leaf books on the market are often set on the inside of the cover. In this way, when the paper is unfolded, the inside of the paper is stacked on the clamp. The clamp on the lower side of the paper will cause a step surface on the paper, which will hurt your hand. When writing on the side of the paper, there is a sense of suspension, which is a poor experience. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a loose-leaf book, in which the loose-leaf papers in the cover are smooth and will not hurt the hand when writing.

[0004] The technical solution of the present utility model is to provide a loose-leaf book, including a clamp and a cover, the clamp including at least one set of first claws and second claws, the first claws and the second claws can be closed or separated accordingly, the clamp is located on the outside of the cover and connected to the cover, the first claws and the second claws extend into the cover and are used to fix the punched paper.

[0005] Compared with the existing technology, the loose-leaf notebook clip of the present invention has the following advantages: the clamp of the loose-leaf notebook is set on the outside of the cover and will not be overlapped under the loose-leaf paper inside the cover, avoiding hurting the hands when writing. When the loose-leaf paper is unfolded, it is directly laid on the cover, flat and without a sense of suspension, providing a good experience.

[0006] Preferably, the clamp includes a bracket, a pull rod, and a first clamping portion, wherein the first clamping portion is provided on the first clamping portion, and the second clamping portion is provided on the bracket. The pull rod is slidably connected to the bracket and the first clamping portion, respectively. Sliding the pull rod relative to the bracket drives the first clamping portion to slide relative to the bracket, thereby closing or separating the first and second clamping portions accordingly. With this structure, the closing or separation of the first and second clamping portions is achieved by sliding the pull rod relative to the bracket, eliminating the need to forcefully press the first and second clamping portions to unlock as in the prior art, resulting in simple and labor-saving operation.

[0007] Preferably, the bracket is provided with two cover connecting portions; the pull rod is provided with an upper avoidance portion and a lower avoidance portion for avoiding the two cover connecting portions; the first clamping portion is provided with a first upper avoidance groove and a first lower avoidance groove for avoiding the two cover connecting portions; and two screws are provided in the cover, each screw passing through the cover and connected to the two cover connecting portions. With this structure, the connection between the cover and the loose-leaf book clamp is simple and easy to assemble, without affecting the movement of the pull rod and the first clamping portion, and without affecting the opening and closing of the first and second clamping jaws.

[0008] Preferably, a cover retaining portion is provided at the top of the bracket, and a hook structure is provided inside the cover retaining portion, so that the upper end of the cover is retained within the hook structure of the cover retaining portion. This structure can limit the cover when connecting the clamp to the cover, facilitating assembly and making the clamp and cover more compact in structure.

[0009] Preferably, a pull rod slide is provided on the bracket along its length, the pull rod slidingly engaging within the pull rod slide, the first clamping portion is provided with at least one first slide groove, and the pull rod is provided with a first protrusion correspondingly inserted and slidingly engaging with the first slide groove; the pull rod can slide along the pull rod slide to cause the first protrusion to slide within the corresponding first slide groove, driving the first clamping portion to move leftward or rightward relative to the bracket, thereby driving the first and second clamping jaws to close or separate accordingly. This structure simplifies the structure of the pull rod driving the first clamping portion, making the overall structure of the loose-leaf book clamp of the utility model simple, easy to assemble, and convenient to operate.

[0010] Preferably, a push-pull portion is provided at the lower end of the pull rod, which is opposite to the lower end of the cover. Pulling the push-pull portion away from the lower end of the cover separates the first and second claws, while pushing the push-pull portion toward the lower end of the cover causes the first and second claws to close in correspondence. With this structure, the push-pull portion is clearly exposed, making it easier to pull the pull rod to open and close the first and second claws. When the first and second claws are closed in correspondence, the clamp and cover are more compact in structure.

[0011] Preferably, a first limiting flange is provided on the wall of the first chute, and the first protrusion slides upward along the first chute below the first limiting flange to cause the first and second claws to close correspondingly; when the first and second claws are closed correspondingly, the first protrusion slides above the first limiting flange and is restrained by the first limiting flange. With this structure, when the first and second claws are closed correspondingly, the pull rod cannot slide freely, and the first and second claws are locked and will not open automatically. In this way, the first and second claws can be locked without the need for a mutually interlocking structure as in the prior art.

[0012] Preferably, the pull rod slides upward along the pull rod slideway to cause the first and second jaws to close in correspondence; the first clamping portion is provided with a first upper limit groove, the first upper limit groove being provided with a downward opening, and the pull rod is provided with an upwardly protruding first limit portion. When the first and second jaws are correspondingly closed, the first limit portion enters the first upper limit groove from the downward opening of the first upper limit groove and is restrained by the first upper limit groove. With this structure, when the first and second jaws are correspondingly closed, the first clamping portion cannot move left or right, and the pull rod cannot slide down, that is, the first and second jaws are locked and cannot open automatically. In this way, the first and second jaws can be locked without the need for a mutually interlocking structure as in the prior art.

[0013] Preferably, the first sliding groove includes a first groove section and a second groove section that are connected end to end, and the angle between the first groove section and the length direction of the bracket is smaller than the angle between the second groove section and the length direction of the bracket; when the first and second claws begin to separate from their corresponding closed states, the first clamping portion releases its restraint on the pull rod, and the first protrusion slides within the first groove section; when the first protrusion slides within the second groove section, the first clamping portion moves leftward or rightward relative to the bracket. With this structure, the provision of the first groove section helps reduce the resistance of the first clamping portion to the pull rod during the process of releasing the restraint on the pull rod, thereby reducing the effort required to pull the pull rod.

[0014] Preferably, the pull rod is provided with an upwardly protruding second stop portion, and the lower end of the first clamping portion is provided with a first lower stop groove, which is provided with a downward opening. When the pull rod slides along the pull rod slide until the first and second clamping jaws are correspondingly closed, the second stop portion enters the first lower stop groove from the downward opening, thereby limiting the first lower stop groove. With this structure, when the first and second clamping jaws are correspondingly closed, the first clamping portion cannot move left or right, and the first clamping portion cannot reversely drive the pull rod, thereby preventing the clamp of the loose-leaf book of the present invention from opening on its own.

[0015] Preferably, the bracket is provided with a clamp slide, the first clamp portion is slidably disposed on the clamp slide, a second clamp limiting groove is provided on one side of the clamp slide, the opening of the second clamp limiting groove faces the inner side of the clamp slide, and a second limiting flange is provided on one side of the first clamp portion, which protrudes outward; when the first clamping jaw and the second clamping jaw are correspondingly closed, the second limiting flange enters the second clamp limiting groove and is retained by the second clamp limiting groove. This structure prevents excessive movement of the first clamp portion and ensures that the first clamping jaw and the second clamping jaw do not interfere with each other excessively after they are correspondingly closed.

[0016] Preferably, the bracket is provided with a second rod stopper above the rod slide. The second rod stopper protrudes inwardly of the rod slide and is used to limit the position of the rod in a direction perpendicular to the rod slide. Side avoidance grooves are provided on the sides of the rod to provide relief for the second rod stopper. With this structure, the second rod stopper prevents the rod within the rod slide from detaching from the bracket in a direction perpendicular to the rod slide. The side avoidance grooves facilitate assembly and disassembly of the rod in a direction perpendicular to the rod slide.

[0017] Preferably, a first rod stop is provided within the rod slideway. When the rod slides upward along the rod slideway until the first and second jaws are correspondingly closed, the first rod stop limits the top end of the rod. This structure prevents the rod from sliding excessively, preventing the rod from causing the first clamp to shift along the rod slideway, ensuring that the travel of the first clamp remains unchanged and that the first and second jaws can close smoothly.

[0018] Preferably, the upper and lower portions of the bracket are each provided with a first clamp stop, and a return hook structure is provided inside the first clamp stop. The upper and lower ends of the first clamp are respectively retained within the return hook structures of the corresponding first clamp stop. This structure prevents the first clamp from shifting along the length of the bracket, ensures that the first clamp's travel range remains unchanged, and ensures that the first and second clamps can close smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an exploded view of Example 1 of the loose-leaf book holder of the present invention.

[0020] Figure 2 for Figure 1 A magnified view of the structure of area A in the middle.

[0021] Figure 3 for Figure 1 A magnified view of the structure of region B in the middle.

[0022] Figure 4 for Figure 1 A magnified view of the structure of the first chute.

[0023] Figure 5 This is an exploded view of embodiment 2 of the clamp for a loose-leaf notebook of the present invention.

[0024] Figure 6 This is an exploded view of Example 3 of the loose-leaf book holder of the present invention.

[0025] Figure 7 This is a schematic structural diagram of the loose-leaf notebook of the present invention.

[0026] Figure 8 This is a schematic diagram of the internal structure of the loose-leaf notebook of the present invention.

[0027] As shown in the figure:

[0028] 1. Bracket, 1-1. Cover limiting part, 1-2. First clamp limiting part, 1-3. First pull rod limiting part, 1-4. Cover connecting part, 1-5. Pull rod slide, 1-6. Clamp slide, 1-7. Second clamp limiting groove, 1-8. Second pull rod limiting part, 2. Pull rod, 2-1. Upper avoidance part, 2-2. First limiting part, 2-3. First boss, 2-4. Lower avoidance part, 2-5. Second limiting part, 2-6. Push-pull part, 2-7. Side avoidance groove, 2-8. Second boss , 3. First clamping part, 3-1. First clamping claw, 3-2. First upper avoidance groove, 3-3. First upper limit groove, 3-4. First slide groove, 3-41. First limit flange, 3-42. First groove section, 3-43. Second groove section, 3-5. Second limit flange, 3-6. First lower avoidance groove, 3-7. First lower limit groove, 4. Second clamping part, 4-1. Second clamping claw, 4-2. Second upper avoidance groove, 4-4. Second slide groove, 4-6. Second lower avoidance groove, 5. Cover, 6. Screw. DETAILED DESCRIPTION

[0029] In order to better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0030] In the drawings, the thickness, size and shape of objects have been slightly exaggerated for ease of explanation. The drawings are only examples and are not drawn strictly to scale.

[0031] It should also be understood that the terms "comprising," "having," "including," and "containing," when used in this specification, indicate the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof. Furthermore, expressions such as "...at least one of" when following a list of listed features modify the entire list, rather than modifying the individual elements in the list. Example 1

[0032] like Figure 1 As shown in the figure, the clamp of the loose-leaf book of the present invention includes a bracket 1, a pull rod 2, a first clamping part 3, and a second clamping part 4. The second clamping part 4 is fixedly arranged on the bracket 1. In this embodiment, the second clamping part 4 and the bracket 1 are an integrated structure. The first clamping part 3 is provided with a plurality of semi-circular first claws 3-1, and the second clamping part 4 is provided with a plurality of semi-circular second claws 4-1.

[0033] like Figure 2 and Figure 3 As shown in the figure, a pull rod slide 1-5 is provided on the bracket 1 along the length direction of the bracket 1, and the pull rod 2 is slidably fitted in the pull rod slide 1-5, that is, the pull rod 2 is slidably connected to the bracket 1. A first pull rod limiting portion 1-3 is provided in the pull rod slide 1-5, and the pull rod 2 can slide upward along the pull rod slide 1-5 to the first pull rod limiting portion 1-3 to limit the top end of the pull rod 2. A second pull rod limiting portion 1-8 is provided on the bracket 1 above the pull rod slide 1-5, and the second pull rod limiting portion 1-8 protrudes toward the inner side of the pull rod slide 1-5, and the second pull rod limiting portion 1-8 is used to limit the pull rod 2 in a direction perpendicular to the pull rod slide 1-5; a side avoidance groove 2-7 is provided on the side of the pull rod 2, and the side avoidance groove 2-7 can avoid the second pull rod limiting portion 1-8.

[0034] A clamp slide 1-6 is provided on the bracket 1 above the pull rod slide 1-5. The first clamp portion 3 is provided on the clamp slide 1-6, that is, the first clamp portion 3 is provided above the pull rod 2. The bracket 1 is provided with first clamp stop portions 1-2 at both the top and bottom. The first clamp portion 3 is clamped between the two first clamp stop portions 1-2 from top to bottom.

[0035] Two first slots 3-4 are provided on the first clamping portion 3, and two first protrusions 2-3 are provided on the pull rod 2 to engage and slide with the corresponding first slots 3-4, thereby slidably connecting the pull rod 2 and the first clamping portion 3. When the pull rod 2 slides along the pull rod slide 1-5, the first protrusions 2-3 slide in the corresponding first slots 3-4, driving the first clamping portion 3 to move laterally relative to the bracket 1, thereby closing or separating the first claw 3-1 and the second claw 4-1.

[0036] like Figure 4 As shown in the figure, a first limiting flange 3-41 is provided on the wall of the first sliding groove 3-4. When the first clamping claw 3-1 and the second clamping claw 4-1 are closed correspondingly, the first boss 2-3 slides upward along the first sliding groove 3-4 to the top of the first limiting flange 3-41 and is limited by the first limiting flange 3-41, that is, the first clamping part 3 limits the pull rod 2, so that the closure of the first clamping claw 3-1 and the second clamping claw 4-1 is stable and reliable. At this time, the first pull rod limiting part 1-3 limits the top end of the pull rod 2.

[0037] The first sliding groove 3-4 is provided with a first groove section 3-42 and a second groove section 3-43 below the first limiting flange 3-41. The angle between the first groove section 3-42 and the length of the bracket 1 is smaller than the angle between the second groove section 3-43 and the length of the bracket 1. When the first boss 2-3 is released from the restraint of the first limiting flange 3-41, the first clamping portion 3 releases the restraint on the pull rod 2, and the first boss 2-3 enters the first groove section 3-42 and can slide along the first groove section 3-42. When the first boss 2-3 enters the second groove section 3-43 and slides along the second groove section 3-43, the first clamping portion 3 moves laterally in the direction of the corresponding closing or separation of the first claw 3-1 and the second claw 4-1.

[0038] A first upper limit groove 3-3 is provided on the first clamping part 3, and the first upper limit groove 3-3 is provided with a downward opening. A first limit part 2-2 protruding upward is provided on the pull rod 2. When the pull rod 2 slides upward along the pull rod slide 1-5 until the first clamping claw 3-1 and the second clamping claw 4-1 are closed accordingly, the first limit part 2-2 enters the first upper limit groove 3-3 from the downward opening of the first upper limit groove 3-3 and is limited by the first upper limit groove 3-3, further ensuring that the closure of the first clamping claw 3-1 and the second clamping claw 4-1 is stable and reliable.

[0039] In addition, the pull rod 2 is provided with a second limiting portion 2-5 protruding upward, and the lower end of the first clamping portion 3 is provided with a first lower limiting groove 3-7, and the first lower limiting groove 3-7 is provided with a downward opening. When the pull rod 2 slides upward along the pull rod slide 1-5 until the first clamping claw 3-1 and the second clamping claw 4-1 are closed correspondingly, the second limiting portion 2-5 enters the first lower limiting groove 3-7 from the downward opening of the first lower limiting groove 3-7, and the second limiting portion 2-5 limits the first lower limiting groove 3-7 to prevent the first clamping portion 3 from pulling the pull rod 2 in the opposite direction.

[0040] A second clamp limiting groove 1-7 is provided on one side of the clamp slide 1-6, and the opening of the second clamp limiting groove 1-7 faces the inner side of the clamp slide 1-6. A second limiting flange 3-5 protruding outward is provided on one side of the first clamp part 3; when the first clamping claw 3-1 and the second clamping claw 4-1 are closed correspondingly, the second limiting flange 3-5 enters the second clamp limiting groove 1-7 and is limited by the second clamp limiting groove 1-7.

[0041] The clamp of the loose-leaf book of the present invention is provided with two cover connecting parts 1-4 on the bracket 1; the pull rod 2 is provided with an upper avoidance part 2-1 and a lower avoidance part 2-4 for avoiding the two cover connecting parts 1-4 respectively; the first clamping part 3 is provided with a first upper avoidance groove 3-2 and a first lower avoidance groove 3-6 for avoiding the two cover connecting parts 1-4 respectively.

[0042] like Figure 7 and Figure 8As shown in , the loose-leaf book of the present invention includes a cover 5, and the outer side of the cover 5 is provided with a clamp of the loose-leaf book of the present invention, the first clamping claw 3-1 and the second clamping claw 4-1 extend into the interior of the cover 5, and two screws 6 are provided in the cover 5, and the two screws 6 pass through the cover 5 and are connected to the two cover connecting parts 1-4 respectively. The upper part of the bracket 1 is provided with a cover limiting part 1-1, which is used to limit the upper end of the cover 5. The lower end of the pull rod 2 is provided with a push-pull part 2-6, which is arranged perpendicular to the cover 5 and is limited by the lower end of the cover 5 to the outer side of the cover 5. The loose-leaf book of the present invention can be provided with a loose-leaf core composed of a plurality of loose-leaf papers, and the loose-leaf core is clamped into a book by the first clamping claw 3-1 and the second clamping claw 4-1.

[0043] The loose-leaf book of the present invention has a clamp that opens and closes by sliding a pull rod relative to a bracket, and does not need to press the first and second clamps with force to unlock as in the prior art, so the operation is simple and labor-saving; and the clamp of the loose-leaf book is arranged on the outside of the cover and will not be overlapped under the loose-leaf paper in the cover, avoiding scratching the hands when writing, and the loose-leaf paper is directly laid on the cover when unfolded, so it is flat and does not feel suspended, and the user experience is good. Example 2

[0044] like Figure 5 As shown in FIG, the loose-leaf book holder of this embodiment differs from that of Example 1 in that the second clamping portion 4 is not integral with the bracket 1 but is instead positioned above the pull rod 2 and slidably connected to the bracket 1. The second clamping portion 4 is provided with two second slots 4-4. The two first protrusions 2-3 correspondingly inserted and slidably engaged with the first slots 3-4 simultaneously pass through the corresponding second slots 4-4. The second slots 4-4 are arranged in the opposite direction of the first slots 3-4. The second clamping portion 4 is provided with a second upper relief slot 4-2 and a second lower relief slot 4-6 that respectively relieve the two cover connecting portions 1-4.

[0045] When the pull rod 2 slides along the pull rod slide 1-5, the first boss 2-3 slides in the corresponding first slide groove 3-4 and second slide groove 4-4 at the same time, driving the first clamp 3 and the second clamp 4 to move in opposite directions, that is, the first clamp 3 and the second clamp 4 move laterally in opposite directions, so that the first claw 3-1 and the second claw 4-1 are closed or separated accordingly. Example 3

[0046] like Figure 6As shown in FIG, the loose-leaf book holder of this embodiment differs from that of Example 1 in that the second clamping portion 4 is not integral with the bracket 1 but is instead positioned above the pull rod 2 and slidably connected to the bracket 1. The second clamping portion 4 is provided with two second slots 4-4, and the pull rod 2 is provided with a second protrusion 2-8 that plugs and slidably engages with the second slots 4-4. The second slots 4-4 are offset from the first slots 3-4 and have opposite structures, and the first clamping portion 3 and the second clamping portion 4 also avoid each other. The second clamping portion 4 is provided with a second upper avoidance slot 4-2 and a second lower avoidance slot 4-6 that respectively avoid the two cover connecting portions 1-4.

[0047] When the pull rod 2 slides along the pull rod slide 1-5, the first boss 2-3 slides in the corresponding first slide groove 3-4, and the second boss 2-8 slides in the corresponding second slide groove 4-4. The pull rod 2 drives the first clamp 3 and the second clamp 4 to move in opposite directions, that is, the first clamp 3 and the second clamp 4 move laterally in opposite directions, and the second clamp 4 and the first clamp 3 move toward each other so that the first claw 3-1 and the second claw 4-1 are closed accordingly, and the second clamp 4 and the first clamp 3 move in opposite directions so that the second claw 4-1 is separated from the first claw 3-1.

[0048] The above are only specific embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. If the present invention is modified or replaced with equivalents without departing from the spirit and scope of the present invention, they should be included in the scope of protection of the claims of the present invention.

Claims

1. A loose-leaf book comprising a clamp and a cover (5), wherein the clamp comprises at least one set of a first clamping claw (3-1) and a second clamping claw (4-1), wherein the first clamping claw (3-1) and the second clamping claw (4-1) can be closed or separated correspondingly, and wherein: The clamp is located outside the cover (5) and connected to the cover (5); the first clamp (3-1) and the second clamp (4-1) extend into the cover (5) and are used to fix the punched paper.

2. The loose-leaf book according to claim 1, wherein: The clamp comprises a bracket (1), a pull rod (2), and a first clamping part (3); a first clamping claw (3-1) is arranged on the first clamping part (3); a second clamping claw (4-1) is arranged on the bracket (1); the pull rod (2) is slidably connected to the bracket (1) and the first clamping part (3), respectively; the sliding of the pull rod (2) relative to the bracket (1) can drive the first clamping part (3) to slide relative to the bracket (1), so that the first clamping claw (3-1) and the second clamping claw (4-1) are closed or separated accordingly.

3. The loose-leaf book according to claim 2, wherein: Two cover connection parts (1-4) are provided on the bracket (1); an upper avoidance part (2-1) and a lower avoidance part (2-4) are provided on the pull rod (2) for avoiding the two cover connection parts (1-4) respectively; a first upper avoidance groove (3-2) and a first lower avoidance groove (3-6) are provided on the first clamping part (3) for avoiding the two cover connection parts (1-4) respectively; two screws (6) are provided in the cover (5), and the two screws (6) respectively pass through the cover (5) and are connected to the two cover connection parts (1-4) accordingly.

4. The loose-leaf book according to claim 2, wherein: A cover limiting portion (1-1) is provided on the top of the bracket (1), a hook structure is provided on the inner side of the cover limiting portion (1-1), and the upper end of the cover (5) is limited in the hook structure of the cover limiting portion (1-1).

5. The loose-leaf book according to claim 2, wherein: A pull rod slideway (1-5) is provided on the bracket (1) along the length direction of the bracket (1); the pull rod (2) is slidably engaged in the pull rod slideway (1-5); at least one first slide groove (3-4) is provided on the first clamping part (3); and a first protrusion (2-3) is provided on the pull rod (2) and is correspondingly plugged into and slidably engaged with the first slide groove (3-4); the pull rod (2) can slide along the pull rod slideway (1-5) to make the first protrusion (2-3) slide in the corresponding first slide groove (3-4), thereby driving the first clamping part (3) to move leftward or rightward relative to the bracket (1), thereby driving the first clamping claw (3-1) and the second clamping claw (4-1) to close or separate accordingly.

6. The loose-leaf book according to claim 5, characterized in that: The lower end of the pull rod (2) is provided with a push-pull portion (2-6), which is opposite to the lower end of the cover (5). Pulling the push-pull portion (2-6) in a direction away from the lower end of the cover (5) can separate the first clamping claw (3-1) and the second clamping claw (4-1), and pushing the push-pull portion (2-6) in a direction toward the lower end of the cover (5) can close the first clamping claw (3-1) and the second clamping claw (4-1) accordingly.

7. The loose-leaf book according to claim 5, wherein: A first limiting flange (3-41) is provided on the wall of the first sliding groove (3-4); the first protrusion (2-3) slides upward along the first sliding groove (3-4) below the first limiting flange (3-41), so that the first clamping claw (3-1) and the second clamping claw (4-1) are correspondingly closed; when the first clamping claw (3-1) and the second clamping claw (4-1) are correspondingly closed, the first protrusion (2-3) slides to the top of the first limiting flange (3-41) and is limited by the first limiting flange (3-41).

8. The loose-leaf book according to claim 5, wherein: The pull rod (2) slides upward along the pull rod slideway (1-5) to enable the first clamping claw (3-1) and the second clamping claw (4-1) to be closed accordingly; the first clamping portion (3) is provided with a first upper limit groove (3-3), the first upper limit groove (3-3) is provided with a downward opening, and the pull rod (2) is provided with a first upper limit portion (2-2) protruding upward; when the first clamping claw (3-1) and the second clamping claw (4-1) are closed accordingly, the first limit portion (2-2) enters the first upper limit groove (3-3) from the downward opening of the first upper limit groove (3-3) and is limited by the first upper limit groove (3-3).

9. The loose-leaf book according to claim 7 or 8, characterized in that: The first sliding groove (3-4) comprises a first groove section (3-42) and a second groove section (3-43) connected end to end, wherein the angle between the first groove section (3-42) and the bracket (1) in the length direction is smaller than the angle between the second groove section (3-43) and the bracket (1) in the length direction; when the first clamping claw (3-1) and the second clamping claw (4-1) begin to separate from the corresponding closed state, the first clamping part (3) releases the restriction on the pull rod (2), and the first protrusion (2-3) slides in the first groove section (3-42); when the first protrusion (2-3) slides in the second groove section (3-43), the first clamping part (3) moves leftward or rightward relative to the bracket (1).

10. The loose-leaf book according to claim 5, wherein: The pull rod (2) is provided with a second limiting portion (2-5) protruding upward, and the lower end of the first clamping portion (3) is provided with a first lower limiting groove (3-7), and the first lower limiting groove (3-7) is provided with a downward opening. When the pull rod (2) slides along the pull rod slideway (1-5) until the first clamping claw (3-1) and the second clamping claw (4-1) are closed correspondingly, the second limiting portion (2-5) enters the first lower limiting groove (3-7) from the downward opening of the first lower limiting groove (3-7), and the second limiting portion (2-5) limits the first lower limiting groove (3-7).

11. The loose-leaf book according to claim 5, wherein: A clamp slideway (1-6) is provided on the bracket (1), the first clamping part (3) is slidably provided on the clamp slideway (1-6), a second clamp limiting groove (1-7) is provided on one side of the clamp slideway (1-6), the opening of the second clamp limiting groove (1-7) faces the inner side of the clamp slideway (1-6), and a second limiting flange (3-5) protruding outward is provided on one side of the first clamping part (3); when the first clamping claw (3-1) and the second clamping claw (4-1) are correspondingly closed, the second limiting flange (3-5) enters the second clamp limiting groove (1-7) and is limited by the second clamp limiting groove (1-7).

12. The loose-leaf book according to claim 5, wherein: A second pull rod limiting portion (1-8) is provided on the bracket (1) above the pull rod slideway (1-5), the second pull rod limiting portion (1-8) protruding toward the inner side of the pull rod slideway (1-5), and the second pull rod limiting portion (1-8) is used to limit the position of the pull rod (2) in a direction perpendicular to the pull rod slideway (1-5); a side avoidance groove (2-7) is provided on the side of the pull rod (2), and the side avoidance groove (2-7) avoids the second pull rod limiting portion (1-8).

13. The loose-leaf book according to claim 5, wherein: A first pull rod limiting portion (1-3) is provided in the pull rod slideway (1-5); when the pull rod (2) slides upward along the pull rod slideway (1-5) until the first clamping claw (3-1) and the second clamping claw (4-1) are correspondingly closed, the first pull rod limiting portion (1-3) limits the top end of the pull rod (2).

14. The loose-leaf book according to claim 5, wherein: The upper and lower parts of the bracket (1) are both provided with a first clamp limiting portion (1-2), the inner side of the first clamp limiting portion (1-2) is provided with a return hook structure, and the upper end and the lower end of the first clamp (3) are respectively limited in the return hook structure corresponding to the first clamp limiting portion (1-2).

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