A book reading holder

Abstract

This application discloses a book clip, relating to the field of stationery, comprising: a first clamping assembly, the first clamping assembly including a first support arm and a clamp, the clamp being disposed at the lower part of the first support arm, the first support arm having a plurality of positioning grooves; a second clamping assembly, the second clamping assembly being rotatably connected to the front side of the first support arm, the second clamping assembly including a second support arm and another clamp, the clamp being disposed at the lower part of the second support arm; and a support assembly, the support assembly including a pad and a support frame, the pad being disposed at the rear side of the first support arm, the pad having a suspension block, the end of the suspension block having a positioning pin, the positioning pin being adapted to a positioning groove, the positioning pin engaging with different positioning grooves to adjust and lock the angle between the support assembly and the first clamping assembly, the support frame being rotatably disposed on the pad, the support frame being adapted to rotate to one side to open into a support state, and after rotating to the other side, engaging and fixing with the first support arm to form a storage state.

Description

Technical Field

[0001] This application relates to the field of stationery technology, and in particular discloses a book clip. Background Technology

[0002] As a common reading aid, the core function of a book clip is to stably hold a book, thereby freeing up your hands.

[0003] However, existing book clips have several problems in practical use: First, different books vary greatly in size, from pocketbooks to large picture books, and many book clips have fixed or limited adjustable openings, making them unable to effectively adapt to books of different sizes and lacking versatility; Second, the support structure of existing book clips is either separate from the main body or loose when folded, taking up a lot of space and making them inconvenient to carry. Even integrated designs often lack an effective locking mechanism, making them prone to accidental unfolding when stored, resulting in a poor user experience. Therefore, improvements are needed. Utility Model Content

[0004] The purpose of this application is to provide a book clip.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a book clip, comprising: a first clamping assembly, the first clamping assembly including a first support arm and a clamp, the clamp being disposed at the lower part of the first support arm, the first support arm being provided with a plurality of positioning grooves; a second clamping assembly, the second clamping assembly being rotatably connected to the front side of the first support arm, the second clamping assembly including a second support arm and another clamp, the clamp being disposed at the lower part of the second support arm; a support assembly, the support assembly including a pad and a support frame, the pad being disposed at the rear side of the first support arm, the pad being provided with a suspension block, the end of the suspension block being provided with a positioning pin, the positioning pin being adapted to the positioning groove, and by engaging the positioning pin with different positioning grooves, the angle between the support assembly and the first clamping assembly is adjusted and locked, the support frame being rotatably disposed on the pad, the support frame being adapted to rotate to one side to open to form a support state, and after rotating to the other side, being engaged and fixed with the first support arm to form a storage state.

[0006] As a preferred embodiment, the first support arm includes an integrally formed first connecting part and a first supporting part, the first connecting part having a first through hole, the second support arm including an integrally formed second connecting part and a second supporting part, a connecting seat being provided on the rear side of the second connecting part, a second through hole being provided in the middle of the gasket, the outer diameter of the connecting seat, the diameter of the first through hole and the diameter of the second through hole being the same, and the connecting seat passing through the first through hole and the second through hole in sequence and then being connected to a screw.

[0007] As a preferred embodiment, the gasket is provided with a third bearing and a stop, the support frame is provided with a shaft, and the support frame is hinged to the gasket by the connection between the shaft and the third bearing. The support frame is adapted to perform damped rotation, the stop is provided on the side of the gasket away from the suspension block, and the support frame stops after rotating to abut against the suspension block, thus being in a support state.

[0008] In a further preferred embodiment, the support frame is provided with a latch, and the back side of the first connecting part is provided with a notch. A buckle is formed at the notch. The support frame rotates to the side away from the stop block, and at the same time, the angle between the bracket assembly and the first clamping assembly is adjusted so that the buckle engages with the latch, thereby putting it in a storage state.

[0009] Further preferably, a plurality of the positioning grooves are arranged circumferentially around the axis of the first through hole. The suspension block includes a first suspension block and a second suspension block symmetrically formed on the gasket. The ends of the first suspension block and the second suspension block are both free ends. The positioning pin includes a first positioning pin disposed on the end of the first suspension block and a second positioning pin disposed on the end of the second suspension block. When the first positioning pin engages with any of the positioning grooves, the second positioning pin simultaneously engages with the other positioning groove. When the first clamping assembly and / or the bracket assembly are rotated to disengage the first positioning pin and the second positioning pin from the positioning grooves, the first suspension block and the second suspension block undergo elastic deformation. When the first positioning pin and the second positioning pin engage with the corresponding positioning grooves, the first suspension block and the second suspension block return to their initial shape.

[0010] As a preferred embodiment, a first bearing seat is provided at the lower part of the first support portion. The clamp includes a clamping plate, a connecting shaft, and a torsion spring. The connecting shaft is mounted on the first bearing seat, the clamping plate is mounted on the connecting shaft, and the torsion spring is sleeved on the connecting shaft, with one end abutting against the first support portion and the other end abutting against the back side of the clamping plate. In the initial state, under the elastic force of the torsion spring, the clamping plate and the first support portion form a closed shape. Pressing the clamping plate to rotate it forms an open shape with the first support portion, and the torsion spring undergoes further deformation, accumulating elastic potential energy. After releasing the clamping plate, the torsion spring releases the elastic potential energy, causing the clamping plate to close and return to the initial state.

[0011] As a preferred embodiment, a second bearing seat is provided at the lower part of the second support portion. The clamp includes a clamping plate, a connecting shaft, and a torsion spring. The connecting shaft is mounted on the second bearing seat, the clamping plate is mounted on the connecting shaft, and the torsion spring is sleeved on the connecting shaft, with one end abutting against the second support portion and the other end abutting against the back side of the clamping plate. In the initial state, under the elastic force of the torsion spring, the clamping plate and the second support portion form a closed shape. Pressing the clamping plate to rotate it forms an open shape with the second support portion, and the torsion spring undergoes further deformation, accumulating elastic potential energy. After releasing the clamping plate, the torsion spring releases the elastic potential energy, causing the clamping plate to close and return to the initial state.

[0012] Further preferably, the clamping plate is provided with a clamping piece, one end of which is fixed to the clamping plate and the other end is suspended. There is a gap between the clamping piece and the clamping plate, and the opening direction of the clamping piece is the same as the opening direction of the clamping plate in its open state.

[0013] Further preferably, the clamp is provided with a plurality of anti-slip protrusions, the anti-slip protrusions being arranged in the same direction as the axis of the connecting shaft.

[0014] In a further preferred embodiment, a clearance groove is provided on the side of the support frame away from the stop block, and when the support frame is in the retracted state, the head of the screw is located in the clearance groove.

[0015] As a preferred embodiment, the support frame is symmetrically provided with a first leg and a second leg at the end away from the pad.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: (1) This application rotatably connects the second clamping component to the first clamping component, so that the two clamping components can rotate relatively flexibly. This design allows the book clip to adapt to books of different sizes, effectively solving the problem of poor universality of traditional products due to fixed openings. At the same time, the first clamping component and the second clamping component are infinitely adjustable, which makes it easy for users to adjust to a suitable position. Through the pads of the bracket component and the positioning pins on its suspension block, and the multiple positioning slots distributed circumferentially on the first support arm, the support frame can be precisely adjusted and locked in multiple positions, ensuring that the support frame can provide stable support after the angle between the first clamping component and the second clamping component is adjusted.

[0017] (2) The support frame of this application can rotate in both directions. When rotated to one side, it opens to form a stable support state. When rotated to the other side, it can be fastened with the first support arm and locked firmly to form a compact storage state. This design allows all parts of the reading clip to be folded into a whole when not in use, which greatly saves storage and carrying space and avoids accidental unfolding during carrying, making it extremely portable. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the unfolded state of this utility model.

[0019] Figure 2 This is a three-dimensional structural diagram of the unfolded state of this utility model.

[0020] Figure 3 This is an exploded three-dimensional view of the unfolded structure of this utility model.

[0021] Figure 4 This is a three-dimensional structural cross-sectional view of the present invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the closed state of this utility model.

[0023] Figure 6 This is a three-dimensional structural diagram of the closed state of this utility model.

[0024] Figure 7 This is an exploded view of the three-dimensional structure of the second clamping component of this utility model.

[0025] Figure 8 This is a three-dimensional structural diagram of the second clamping component of this utility model.

[0026] Figure 9 This is an exploded view of the three-dimensional structure of the first clamping component of this utility model.

[0027] Figure 10 This is a three-dimensional structural diagram of the first clamping component of this utility model.

[0028] Figure 11 This is a three-dimensional structural diagram of the bracket assembly of this utility model.

[0029] Figure 12 This is a three-dimensional structural diagram of the bracket assembly of this utility model.

[0030] In the figure: 1. First support arm; 11. First connecting part; 12. First support part; 13. First bearing seat; 14. First through hole; 16. Positioning groove; 17. Notch; 18. Buckle; 2. Second support arm; 21. Second connecting part; 22. Second support part; 23. Second bearing seat; 25. Connecting seat; 3. Bracket assembly; 31. Gasket; 311. Third bearing seat; 312. Second through hole; 313. 314. First suspension block; 315. First positioning pin; 316. Second suspension block; 317. Second positioning pin; 318. Stop block; 32. Support frame; 321. Bayonet; 322. First leg; 323. Second leg; 324. Clearance groove; 325. Shaft; 4. Screw; 5. Clamp; 51. Clamping plate; 511. Gap; 512. Clamping piece; 513. Anti-slip protrusion; 52. Connecting shaft; 53. Torsion spring. Detailed Implementation

[0031] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0032] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0033] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0034] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0035] A preferred embodiment of this application, such as Figures 1 to 12As shown, a book clip includes: a first clamping assembly, which includes a first support arm 1 and a clamp 5, the clamp 5 being disposed at the lower part of the first support arm 1, and the first support arm 1 having a plurality of positioning grooves 16; a second clamping assembly, which is rotatably connected to the front side of the first support arm 1, the second clamping assembly including a second support arm 2 and another clamp 5, the clamp 5 being disposed at the lower part of the second support arm 2; and a support assembly 3, which includes a pad 31 and a support frame 32, the pad 31 being disposed at the rear side of the first support arm 1, the pad 31 having a suspension block, the end of the suspension block having a positioning pin, the positioning pin being adapted to the positioning grooves 16, and by engaging with different positioning grooves 16, the angle between the support assembly 3 and the first clamping assembly is adjusted and locked, the support frame 32 being rotatably disposed on the pad 31, the support frame 32 being adapted to rotate to one side to open to form a support state, and to rotate to the other side to engage and fix with the first support arm 1 to form a storage state.

[0036] This application achieves a flexible relative rotation between the two clamping components by rotatably connecting the second clamping component to the first clamping component. This design allows the book clip to adapt to books of different sizes, effectively solving the problem of poor versatility caused by the fixed opening of traditional products. At the same time, the first and second clamping components are infinitely adjustable, making it easy for users to adjust to a suitable position. Through the positioning pins on the pads 31 and suspension blocks of the bracket assembly 3, and the multiple positioning slots 16 distributed circumferentially on the first support arm 1, the support frame 32 can be precisely adjusted and locked in multiple positions, ensuring that the support frame 32 can provide stable support after the angle between the first and second clamping components is adjusted.

[0037] Meanwhile, in this embodiment, the support frame 32 can rotate in both directions. When rotated to one side, it opens to form a stable support state, and when rotated to the other side, it can be fastened with the first support arm 1 and locked firmly to form a compact storage state. This design allows all parts of the book clip to be folded into a whole when not in use, which greatly saves storage and carrying space and avoids accidental unfolding during carrying, making it extremely portable.

[0038] In this embodiment, the first support arm 1 includes an integrally formed first connecting part 11 and a first support part 12. The first connecting part 11 has a first through hole 14. The second support arm 2 includes an integrally formed second connecting part 21 and a second support part 22. A connecting seat 25 is provided on the rear side of the second connecting part 21. A second through hole 312 is provided in the middle of the gasket 31. The outer diameter of the connecting seat 25, the diameter of the first through hole 14, and the diameter of the second through hole 312 are all the same. The connecting seat 25 passes through the first through hole 14 and the second through hole 312 in sequence and is then connected to the screw 4.

[0039] The screw connection is the most common connection method in the prior art. It has a simple structure, is easy to operate, and has low cost, making it very suitable for use in this product. Of course, in another embodiment, the connection can be made by setting an anti-loosening protrusion at the end of the connecting seat 25. After passing through the first through hole 14 and the second through hole 312, the anti-loosening protrusion will prevent the components from easily coming loose. This setting can also eliminate the need for screw 4. The specific connection method can be adjusted by those skilled in the art.

[0040] Specifically, the shim 31 is provided with a third bearing 311 and a stop 317, and the support frame 32 is provided with a shaft portion 325. The support frame 32 is hinged to the shim 31 through the connection between the shaft portion 325 and the third bearing 311. The support frame 32 is suitable for damped rotation. The stop 317 is located on the side of the shim 31 away from the suspension block. The support frame 32 rotates until it abuts against the suspension block and then stops, thus being in a support state.

[0041] This embodiment provides a damped rotation scheme for the support frame 32, which can realize the placement of the book clip at different angles, thereby adjusting the placement angle of different books to suit the reading of different people. Of course, in another embodiment, the support frame 32 can be set to have only one support state and the angle cannot be adjusted.

[0042] The support frame 32 is provided with a slot 321, and the back side of the first connecting part 11 is provided with a notch 17. A buckle 18 is formed at the notch 17. The support frame 32 rotates to the side away from the stop block 317, and at the same time adjusts the angle between the bracket assembly 3 and the first clamping assembly so that the buckle 18 and the slot 321 are engaged, thus putting it in a storage state.

[0043] This design allows the support frame 32 to be rotated in the opposite direction for storage. When stored, the support frame 32 is fixed to the first connecting part 11, preventing accidental unfolding.

[0044] In a further preferred embodiment, a plurality of positioning grooves 16 are arranged circumferentially around the axis of the first through hole 14. The suspension block includes a first suspension block 313 and a second suspension block 315 symmetrically formed on the gasket 31. The ends of the first suspension block 313 and the second suspension block 315 are both free ends. The positioning pin includes a first positioning pin 314 disposed on the end of the first suspension block 313 and a second positioning pin 316 disposed on the end of the second suspension block 315. When the first positioning pin 314 engages with any positioning groove 16, the second positioning pin 316 simultaneously engages with the other positioning groove 16. When the first clamping assembly and / or the bracket assembly 3 are rotated to disengage the first positioning pin 314 and the second positioning pin 316 from the positioning groove 16, the first suspension block 313 and the second suspension block 315 undergo elastic deformation. When the first positioning pin 314 and the second positioning pin 316 engage with the corresponding positioning groove 16, the first suspension block 313 and the second suspension block 315 return to their initial shape.

[0045] By setting a first suspension block 313 and a second suspension block 315, with one end fixed and the other end suspended as a free end, this design gives it the ability to elastically deform. Therefore, in the process of cooperating with different positioning slots 16, the first suspension block 313 and the second suspension block 315 play a role similar to a spring, ensuring that the positioning pin is smoothly lifted and lowered.

[0046] In this application, a first bearing seat 13 is provided at the lower part of the first support part 12. The clamp 5 includes a clamping plate 51, a connecting shaft 52, and a torsion spring 53. The connecting shaft 52 is mounted on the first bearing seat 13, the clamping plate 51 is mounted on the connecting shaft 52, and the torsion spring 53 is sleeved on the connecting shaft 52, with one end abutting against the first support part 12 and the other end abutting against the back side of the clamping plate 51. In the initial state, under the elastic force of the torsion spring 53, the clamping plate 51 and the first support part 12 form a closed state. After pressing the clamping plate 51 to make it rotate, it forms an open state with the first support part 12, and the torsion spring 53 undergoes further deformation, accumulating elastic potential energy. After releasing the clamping plate 51, the torsion spring 53 releases elastic potential energy, causing the clamping plate 51 to close and return to the initial state. State; The lower part of the second support 22 is provided with a second bearing seat 23. The clamp 5 includes a clamping plate 51, a connecting shaft 52 and a torsion spring 53. The connecting shaft 52 is installed on the second bearing seat 23, the clamping plate 51 is installed on the connecting shaft 52, and the torsion spring 53 is sleeved on the connecting shaft 52, with one end abutting against the second support 22 and the other end abutting against the back side of the clamping plate 51. In the initial state, under the elastic force of the torsion spring 53, the clamping plate 51 and the second support 22 form a closed state. After pressing the clamping plate 51 to make it rotate, it forms an open state with the second support 22. The torsion spring 53 undergoes further deformation and accumulates elastic potential energy. After releasing the clamping plate 51, the torsion spring 53 releases elastic potential energy, causing the clamping plate 51 to close and return to the initial state.

[0047] Furthermore, a clip 512 is provided on the clip plate 51. One end of the clip 512 is fixed to the clip plate 51, and the other end is suspended. There is a gap 511 between the clip 512 and the clip plate 51. The opening direction of the clip 512 is the same as the opening direction of the clip plate 51 when it is open. The design of the clip 512 facilitates reading for the user. During reading, without the clip 512, each page turn requires pressing the clip plate 51, which is inconvenient. By setting the clip 512, the book page can be placed between the clip 512 and the clip plate 51. When it is necessary to turn the page, the corresponding book page can be directly taken out from between the clip 512 and the clip plate 51 on one side, and the page can be placed between the clip 512 and the clip plate 51 on the other side. The operation is simple and does not require pressing the clip plate 51. Similarly, for temporary reading, the clip 512 can also be used directly to save time.

[0048] Furthermore, the clamping plate 51 is also provided with several anti-slip protrusions 513. The anti-slip protrusions 513 are set in the same direction as the axis of the connecting shaft 52. The anti-slip protrusions 513 make pressing the clamping plate 51 more stable and smooth.

[0049] Furthermore, a clearance groove 324 is provided on the side of the support frame 32 away from the stop block 317. When the support frame 32 is in the retracted state, the head of the screw 4 is located in the clearance groove 324, so that the support frame 32 can be smoothly fastened and fixed on the first connecting part 11 to avoid interference.

[0050] As a preferred option, the support frame 32 is symmetrically provided with a first leg 322 and a second leg 323 at the end away from the pad 31 to improve the stability during support.

[0051] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A book clip, characterized in that, include: A first clamping assembly, comprising a first support arm and a clamp, wherein the clamp is disposed at the lower part of the first support arm, and the first support arm is provided with a plurality of positioning grooves; a second clamping assembly, rotatably connected to the front side of the first support arm, comprising a second support arm and another clamp, wherein the clamp is disposed at the lower part of the second support arm; a bracket assembly, comprising a pad and a support frame, wherein the pad is disposed at the rear side of the first support arm, the pad is provided with a suspension block, and the end of the suspension block is provided with a positioning pin, the positioning pin being adapted to the positioning groove, thereby adjusting and locking the angle between the bracket assembly and the first clamping assembly by engaging the positioning pin with different positioning grooves, the support frame being rotatably disposed on the pad, the support frame being adapted to rotate to one side to open into a bracket state, and to rotate to the other side to engage and fix with the first support arm to form a storage state.

2. A book clip as described in claim 1, characterized in that, The first support arm includes an integrally formed first connecting part and a first supporting part. The first connecting part has a first through hole. The second support arm includes an integrally formed second connecting part and a second supporting part. A connecting seat is provided on the rear side of the second connecting part. A second through hole is provided in the middle of the gasket. The outer diameter of the connecting seat, the diameter of the first through hole, and the diameter of the second through hole are all the same. The connecting seat passes through the first through hole and the second through hole in sequence and is then connected to a screw.

3. A book clip as described in claim 2, characterized in that, The pad is provided with a third bearing and a stop, and the support frame is provided with a shaft. The support frame is hinged to the pad by the connection between the shaft and the third bearing. The support frame is adapted to rotate with damping. The stop is located on the side of the pad away from the suspension block. The support frame rotates until it abuts against the suspension block and then stops, thus being in a support state.

4. A book clip as described in claim 3, characterized in that, The support frame is provided with a latch, and the back side of the first connecting part is provided with a notch. A buckle is formed at the notch. The support frame rotates to the side away from the stop block, and at the same time, the angle between the bracket assembly and the first clamping assembly is adjusted so that the buckle and the latch engage, thereby putting it in a storage state.

5. A book clip as described in claim 2, characterized in that, A plurality of positioning grooves are arranged circumferentially around the axis of the first through hole. The suspension block includes a first suspension block and a second suspension block symmetrically formed on the gasket. The ends of the first suspension block and the second suspension block are both free ends. The positioning pin includes a first positioning pin disposed on the end of the first suspension block and a second positioning pin disposed on the end of the second suspension block. When the first positioning pin engages with any of the positioning grooves, the second positioning pin simultaneously engages with the other positioning groove. When the first clamping assembly and / or the bracket assembly are rotated to disengage the first positioning pin and the second positioning pin from the positioning grooves, the first suspension block and the second suspension block undergo elastic deformation. When the first positioning pin and the second positioning pin engage with the corresponding positioning grooves, the first suspension block and the second suspension block return to their initial shape.

6. A book clip as described in claim 2, characterized in that, The lower part of the first support is provided with a first bearing seat. The clamp includes a clamping plate, a connecting shaft, and a torsion spring. The connecting shaft is mounted on the first bearing seat, the clamping plate is mounted on the connecting shaft, and the torsion spring is sleeved on the connecting shaft, with one end abutting against the first support and the other end abutting against the back of the clamping plate. In the initial state, under the elastic force of the torsion spring, the clamping plate and the first support form a closed shape. After pressing the clamping plate to make it rotate, it forms an open shape with the first support. The torsion spring undergoes further deformation, accumulating elastic potential energy. After releasing the clamping plate, the torsion spring releases the elastic potential energy, causing the clamping plate to close and return to the initial state.

7. A book clip as described in claim 2, characterized in that, The lower part of the second support is provided with a second bearing seat. The clamp includes a clamping plate, a connecting shaft, and a torsion spring. The connecting shaft is mounted on the second bearing seat, the clamping plate is mounted on the connecting shaft, and the torsion spring is sleeved on the connecting shaft, with one end abutting against the second support and the other end abutting against the back side of the clamping plate. In the initial state, under the elastic force of the torsion spring, the clamping plate and the second support form a closed shape. Pressing the clamping plate to make it rotate forms an open shape with the second support, and the torsion spring undergoes further deformation, accumulating elastic potential energy. After releasing the clamping plate, the torsion spring releases the elastic potential energy, causing the clamping plate to close and return to the initial state.

8. A book clip as described in claim 6 or 7, characterized in that, The clamping plate is provided with a clamping piece, one end of which is fixed to the clamping plate and the other end is suspended. There is a gap between the clamping piece and the clamping plate, and the opening direction of the clamping piece is the same as the opening direction of the clamping plate in its open state.

9. A book clip as described in claim 6 or 7, characterized in that, The clamp is also provided with a number of anti-slip protrusions, and the anti-slip protrusions are arranged in the same direction as the axis of the connecting shaft.

10. A book clip as described in claim 4, characterized in that, The support frame has a clearance groove on the side away from the stop block. When the support frame is in the retracted state, the head of the screw is located in the clearance groove. The support frame has a first leg and a second leg symmetrically arranged on the side away from the gasket.

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