A knob-type rope tensioning device

Abstract

The present invention provides a knob-type rope tensioning device, comprising a base, a middle frame fixed relative to the base, a winding wheel rotatably arranged on the base, a first ratchet matched with the middle frame, a winding wheel control tooth movably connected to the first ratchet, and a rotary cover, wherein the rope is wound around the winding wheel, the middle frame is provided with a first ratchet disk, the first ratchet engages with the first ratchet disk so that the first ratchet can only rotate in one direction, the winding wheel is provided with a second ratchet disk, the winding wheel control tooth can engage or disengage with the second ratchet disk, the bottom surface of the rotary cover is provided with a connecting disk for controlling the winding wheel control tooth to engage or disengage with the second ratchet disk, a connecting groove is provided on the connecting disk, the winding wheel control tooth is provided with a connecting column, and the connecting column is movably arranged in the connecting groove. When switching, the present invention only needs to rotate the rotary cover at a small angle to complete the switching, which improves the user's experience of loosening and tightening, and can significantly improve the jamming phenomenon.

Description

Technical Field

[0001] The invention relates to the technical field of rope fixing, and in particular to a knob-type rope tightening device. Background Art

[0002] Currently, using ropes to fasten shoes, helmets, shoulder pads, etc. is a common method. When the ropes need to be fastened, it is usually necessary to use both hands to tie the two ends of the ropes, which takes a certain amount of time. In addition, the location of the ropes for helmets and shoulder pads is not convenient for two-handed operation.

[0003] To address this problem, there are improved rope adjustment devices in the prior art, such as the patent with publication number CN216674912U, which provides a shoelace tension adjustment device, including a base, a chassis, a take-up wheel, a ratchet located on the top of the chassis, a driving member located in the middle of the ratchet and a buckle cover that is buckled with the top of the chassis. When the tension adjustment device needs to be tightened, the buckle cover 7 is rotated clockwise, and the buckle block 83 slides from the other side of the buckle groove 504 to the extreme position, which can drive the ratchet 5 to rotate clockwise in the ratchet teeth 203 of the chassis 2. At the same time, during the clockwise rotation of the buckle cover 7, the spiral column 82 is screwed through the spiral hole 603 to drive the drive disc 601 to move downward and engage with the take-up wheel 3. The first driving tooth 602 on the bottom end surface of the drive disc 601 engages with the second driving tooth of the take-up wheel 3. When the buckle cover rotates, it drives the ratchet 5 to rotate clockwise in the ratchet teeth 203 of the chassis 2. The take-up wheel 3 rotates to tighten the external line of the take-up wheel 3; when the external line needs to be loosened, the buckle cover 7 is rotated in the reverse direction. Since the pawl 502 on the outside of the ratchet plate 5 is engaged with the ratchet teeth 203 of the chassis 2, the buckle cover 7 will not drive the ratchet plate 5 to rotate during the reverse rotation. The buckle cover 7 rotates in the reverse direction, and after the buckle block 83 in the rotating disk 81 rotates to the extreme position on the other side, the bottom of the rotating disk 81 drives the driving disk 601 to rise through the spiral column 82, and the driving disk 601 rises in the ratchet hole 503 in the ratchet plate 5 and separates from the second driving tooth of the take-up wheel 3. At this time, the take-up wheel 3 can rotate freely in the chassis 2, and the external line is pulled outward near the head and tail ends of the shoelace tension adjustment device to loosen the external line. This method of adjusting the tightness of the shoelaces by rotating the buckle cover is effortless to use and can be more conveniently operated at the back of the helmet or the shoulder guard position.

[0004] In the aforementioned patent, the drive disc 601 is raised and lowered by a spiral stud 82. This structure is relatively complex, as the tooth surface of the drive disc 601 engages with the second drive teeth of the take-up reel 3 during the raising and lowering process, potentially causing problems such as jamming. Furthermore, the spiral stud 82 typically needs to rotate a large angle when raising and lowering the drive disc 601, particularly when the rope needs to be loosened, leaving room for further improvement. Summary of the Invention

[0005] The purpose of the present invention is to provide a more convenient rope tension adjustment needle installation device in view of the shortcomings of the above-mentioned background technology.

[0006] In order to achieve the above-mentioned objectives, the present invention provides a knob-type rope tensioning device, comprising a base, a middle frame fixed relatively to the base, a winding wheel rotatably connected to the base, a first ratchet rotatably connected to the middle frame, a winding wheel control tooth movably connected to the first ratchet, and a rotary cover, the rope is wound around the winding wheel, the middle frame is provided with a first ratchet disk, the first ratchet is engaged with the first ratchet disk so that the first ratchet can only rotate in one direction, the winding wheel is provided with a second ratchet disk, the winding wheel control tooth can engage or disengage with the second ratchet disk, and the bottom surface of the rotary cover is provided with a connecting disk that controls the engagement or disengagement of the winding wheel control tooth and the second ratchet disk, the connecting disk is provided with a connecting groove, the winding wheel control tooth is provided with a connecting column, and the connecting column is movably arranged in the connecting groove.

[0007] Furthermore, a movable groove is provided on the first ratchet tooth, the winding wheel control tooth is movably arranged in the movable groove and the first end is rotationally connected to the first ratchet tooth, the second end of the winding wheel control tooth is a tooth surface and corresponds to the second ratchet disk, and the winding wheel control tooth switches to a state of engagement or disengagement with the second ratchet disk when rotating in the movable groove.

[0008] Furthermore, the connecting groove includes a first limit point and a first arc surface. When the connecting disk rotates clockwise, the connecting column moves along the first arc surface to the first limit point, and the second end of the winding wheel control tooth rotates to engage with the second ratchet disk, driving the second ratchet disk to rotate clockwise in the process of synchronous rotation with the connecting disk. When the connecting disk rotates counterclockwise, the connecting column slides along the first arc surface, so that the second end of the winding wheel control tooth is separated from the second ratchet disk.

[0009] Furthermore, when the connecting disk rotates 45 degrees counterclockwise, the second end of the winding wheel control tooth is separated from the second ratchet disk.

[0010] Furthermore, a limiting protrusion is formed at a position of the connecting groove close to the first limit point, and the limiting protrusion is used to provide resistance when the rotary cover rotates counterclockwise.

[0011] Furthermore, a transmission protrusion is formed on the first ratchet, and the connecting disk has a first contact surface corresponding to the transmission protrusion. The connecting disk rotates clockwise until the first contact surface collides with the transmission protrusion, thereby driving the first ratchet to rotate synchronously. The connecting disk also has a second contact surface corresponding to the transmission protrusion. The connecting disk rotates counterclockwise until the second contact surface collides with the transmission protrusion, thereby limiting the connecting disk.

[0012] Furthermore, the winding wheel includes an upper layer and a lower layer of the winding wheel, the second ratchet disc is located on the upper layer of the winding wheel, and the rope is connected to the lower layer of the winding wheel.

[0013] Furthermore, the middle frame is also provided with a wire groove, and the two ends of the rope respectively enter from the corresponding wire grooves and are fixed to the winding wheel.

[0014] Furthermore, a plurality of threading holes are provided on the lower layer of the winding wheel for fixing the ends of the rope.

[0015] An arc-shaped clamping strip is also formed on the inner wall of the rotary cover, and the clamping strip cooperates with the clamping groove formed on the outer wall of the middle frame.

[0016] The above solution of the present invention has the following beneficial effects:

[0017] The knob-type rope tensioning device provided by the present invention cooperates with the first ratchet, the winding wheel control tooth and the connecting disk so that when the connecting disk rotates clockwise, the winding wheel can synchronously rotate clockwise to complete the line winding and tighten the rope. When the connecting disk rotates counterclockwise, the second ratchet disk and the winding wheel are both in a free rotation state, which can stretch and relax the rope. When switching, it is only necessary to rotate the rotary cover by a small angle, which improves the user's experience of loosening and tightening, and can significantly improve the jamming phenomenon.

[0018] In the present invention, by virtue of the provision of the limiting protrusion, a significant force needs to be applied when the rotating cap is started by rotating counterclockwise. The limiting effect of the limiting protrusion is overcome before the cap is rotated to release. This prevents the rotating cap from rotating counterclockwise due to accidental contact or loosening during use, thereby preventing the cord from being abnormally loosened due to the cap being rotated counterclockwise, thereby further improving the reliability of the device.

[0019] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is an exploded view of the overall structure of the present invention;

[0022] Figure 3 Schematic diagram of the first ratchet structure of the present invention;

[0023] Figure 4 This is a schematic structural diagram of the connection disk of the present invention;

[0024] Figure 5 for Figure 1 Cross-sectional view at AA.

[0025] [Description of Reference Numerals]

[0026] 1-base; 2-middle frame; 3-winding wheel; 4-first ratchet; 5-winding wheel control tooth; 6-screw cover; 7-first ratchet disc; 8-second ratchet disc; 9-connecting disc; 10-connecting groove; 11-connecting column; 12-movable groove; 13-rotating axis; 14-first limit point; 15-first arc surface; 16-limiting protrusion; 17-anti-slip tooth; 18-wire groove; 19-threading hole; 20-card strip; 21-first buckle block; 22-second buckle block; 23-transmission protrusion; 24-first contact surface; 25-second contact surface; 26-annular protrusion; 27-annular groove. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The various specific technical features and embodiments described in the specific embodiments can be combined in any suitable manner unless there is any contradiction. For example, different embodiments can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the various specific technical features / embodiments in the present invention will not be described separately.

[0028] It should be noted that the terms "setting" and "connecting" should be understood in a broad sense. For example, they can be directly set, installed, or connected, or they can be indirectly set or connected through a central component or a central structure. In addition, the orientations or positional relationships indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. in the present invention are based on the orientations or positional relationships shown in the drawings or the conventional placement state or usage state. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure, feature, device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0029] like Figure 1 、 Figure 2As shown, an embodiment of the present invention provides a knob-type rope tensioning device, comprising a base 1, a middle frame 2 fixed relatively to the base 1, a winding wheel 3 rotatably connected to the base 1, a first ratchet 4 rotatably connected to the middle frame 2, a winding wheel control tooth 5 movably connected to the first ratchet 4, and a rotary cover 6 rotatably covered on the middle frame 2, and the rope is wound around the winding wheel 3. Among them, the middle frame 2 is in a cylindrical form and is detachably connected to the base 1, so that the entire device can be easily disassembled and the internal structure can be maintained and replaced. The middle frame 2 is provided with a first ratchet disk 7, and the tooth surface of the first ratchet disk 7 is in the form of an inner ring. The first ratchet 4 is also a disc-shaped structure as a whole. The tooth surface of the first ratchet 4 is engaged with the first ratchet disk 7, so that the first ratchet 4 can only rotate in one direction. In this embodiment, the example that the first ratchet 4 can only rotate clockwise is used for explanation.

[0030] The winding wheel 3 is provided with a second ratchet disc 8, and the winding wheel control teeth 5 can engage or disengage with the second ratchet disc 8, thereby switching the second ratchet disc 8, that is, the winding wheel 3, into a clockwise unidirectional rotation state or a bidirectional rotation state through the winding wheel control teeth 5. When the winding wheel 3 can only rotate clockwise, it is used to tighten the rope. When it rotates in both directions, it pulls the device outward. Under the action of the rope tension, the winding wheel 3 rotates counterclockwise to pay out the line, causing the rope to automatically stretch and relax.

[0031] It should be noted that the tooth angle of the second ratchet disc 9 is not 90 degrees, but preferably 80 degrees, that is, it is tilted 10 degrees to make the transmission between the winding wheel control teeth 5 and the second ratchet disc 8 more stable and not easy to fall off.

[0032] At the same time Figure 3 、 Figure 4 As shown, the engagement state of the winding wheel control teeth 5 is controlled by the rotation of the rotary cover 6. In this embodiment, a connecting disk 9 is provided on the bottom surface of the rotary cover 6 to control the engagement or disengagement of the winding wheel control teeth 5 with the second ratchet disk 8. When the rotary cover 6 is driven to rotate relative to the middle frame 2, the connecting disk 9 rotates synchronously. Among them, a connecting groove 10 is formed on the connecting disk 9, and the winding wheel control teeth 5 are provided with a connecting column 11. The connecting column 11 is movably set in the connecting groove 10. During the rotation of the connecting groove 10, the connecting column 11 slides relative to the connecting groove 10, so that the position of the connecting column 11 and the winding wheel control teeth 5 relative to the second ratchet disk 8 changes, switching the engagement or disengagement state with the second ratchet disk 8.

[0033] It should be noted that the connecting disk 9 can be integrally formed with the rotary cover 6, and the connecting column 11 and the winding wheel control tooth 5 can also be integrally formed, making the overall structure more compact and the installation and disassembly of each component more convenient.

[0034] In this embodiment, the first ratchet tooth 4 is provided with a movable slot 12. The reel control tooth 5 is movably disposed within the movable slot 12 and has its first end rotatably connected to the first ratchet tooth 4. Specifically, the disc-shaped upper surface of the first ratchet tooth 4 includes a rotating shaft 13, which can also be integrally formed with the first ratchet tooth 4. The first end of the reel control tooth 5 is provided with an opening and is sleeved onto the rotating shaft 13, forming a rotatable connection.

[0035] The second end of the winding wheel control tooth 5 is a tooth surface and corresponds to the second ratchet disc 8 . When the winding wheel control tooth 5 rotates in the movable slot 12 , it can switch between a state of engagement with or a state of disengagement from the second ratchet disc 8 .

[0036] At the same time Figure 5 As shown, the connecting groove 10 includes a first limit point 14 and a first arc surface 15, wherein the first limit point 14 is located at the end of the connecting groove 10. When the connecting disk 9 rotates clockwise, the connecting column 11 slides along the first arc surface 15 relative to the connecting groove 10 to the first limit point 14, and the second end of the winding wheel control tooth 5 rotates to engage with the second ratchet disk 8. At this time, the connecting column 11 is limited by the end of the connecting groove 10 and rotates synchronously with the connecting disk 9. Due to the unidirectional rotation relationship of the second ratchet disk 8, the winding wheel control tooth 5 can also drive the second ratchet disk 8 to rotate clockwise, so that the winding wheel 3 rotates clockwise to complete the winding and tighten the rope. When the connecting disk 9 rotates counterclockwise, the connecting column 11 slides in the opposite direction along the first arc surface 15. Contrary to the above process, the second end of the winding wheel control tooth 5 is separated from the second ratchet disk 8, so that the second ratchet disk 8 and the winding wheel 3 are both in a free rotation state. When the device is pulled outward, the winding wheel 3 can rotate counterclockwise under the action of the rope tension to pay out the line, so that the rope is stretched and relaxed.

[0037] The rope tensioning device provided in this embodiment is significantly different from the method of controlling the lifting and lowering of the second ratchet disk 8 in the prior art. When switching the meshing state of the winding wheel control teeth 5 and the second ratchet disk 8, it is only necessary to rotate the rotary cover 6 by a smaller angle, which further enhances the user experience and can significantly improve the jamming phenomenon.

[0038] As a preferred embodiment, in this embodiment, when the connecting disk 9, that is, the rotary cover 6, rotates 45 degrees counterclockwise, the second end of the winding wheel control tooth 5 can be separated from the second ratchet disk 8, which can be achieved through the specific setting of the first arc surface 15.

[0039] As a preferred embodiment, in order to further improve the stability of rotation control, three groups of winding wheel control teeth 5 are set in this embodiment, distributed in an equiphase annular array relative to the center of the device. The rotating shaft 13, connecting column 11, etc. on the first ratchet 4 are correspondingly set in three groups, and the connecting groove 10 on the connecting disk 9 is also correspondingly set in three groups. Compared with one group, the force is more uniform, making the device more reliable.

[0040] In order to prevent the rotary cover 6 from rotating counterclockwise due to accidental touching or loosening during use, which may cause the rope to relax abnormally, as a further improvement, a limiting protrusion 16 is formed near the first limit point 14 of the connecting groove 10 in this embodiment. The limiting protrusion 16 is used to provide resistance when the rotary cover 6 rotates counterclockwise.

[0041] It should be noted that the limiting protrusion 16 can be located on the first arc surface 15 of the connecting groove 10, or on the arc surface opposite to the first arc surface 15. No specific restrictions are made here. Depending on the setting of the limiting protrusion 16, the rotary cover 6 needs to apply obvious force when starting to rotate counterclockwise, and then rotate and relax after overcoming the limiting effect of the limiting protrusion 16.

[0042] In this embodiment, a transmission protrusion 23 is further formed on the first ratchet tooth 4, and the connecting disk 9 has a first contact surface 24 corresponding to the transmission protrusion 23. When the connecting disk 9 rotates clockwise until the first contact surface 24 contacts the transmission protrusion 23, the first ratchet tooth 4 is driven to rotate synchronously. The connecting disk 9 also has a second contact surface 25 corresponding to the transmission protrusion 23. When the connecting disk 9 rotates counterclockwise until the second contact surface 25 contacts the next transmission protrusion 23, the first ratchet tooth 4 is restricted by the first ratchet disk 7 and cannot rotate counterclockwise, thereby limiting the connection disk 9. In actual design, the spacing between the first contact surface 24 and the second contact surface 25 can be controlled to prevent the rotary cover 6 from rotating further after rotating 45 degrees counterclockwise.

[0043] As a preferred embodiment, in this embodiment, anti-slip teeth 17 are formed on the outer surface of the rotary cover 6 to facilitate the user to rotate the rotary cover 6 and prevent the user from being unable to overcome the force of the limiting protrusion 16 to loosen the rope when the user's hand slips.

[0044] In this embodiment, an annular ridge 26 is also formed on the lower edge of the first ratchet tooth 4, and the annular ridge 26 corresponds to the annular groove 27 on the inner side of the middle frame 2. The annular ridge 26 is made of a material that increases friction, so that the friction increases when the first ratchet tooth 4 rotates clockwise, thereby improving the hand feel while ensuring that the winding wheel control tooth 5 and the second ratchet disk 8 are engaged and transmitted.

[0045] In this embodiment, the winding wheel 3 adopts a layered structure, including an upper layer and a lower layer of the winding wheel. The second ratchet disk 8 is located in the upper layer of the winding wheel, and the rope is connected to the lower layer of the winding wheel. Therefore, the winding and unwinding process of the winding wheel 3 is not interfered with by the second ratchet disk 8.

[0046] In this embodiment, the middle frame 2 is further provided with a wire guide groove 18. The two ends of the rope enter through the corresponding wire guide groove 18 and are fixed to the winding reel 3. The two wire guide grooves 18 have a preset angle, which is suitable for applications such as shoelaces, helmets, and shoulder pads. The angle is neither too large to make it difficult to control nor too small to cause the rope ends to get tangled.

[0047] In this embodiment, the lower layer of the reel 3 is provided with a plurality of threading holes 19 for securing the end of the rope. As a preferred embodiment, the lower layer of the reel 3 is provided with two parallel rows of threading holes 19. Each row of threading holes 19 consists of two threading holes 19 arranged perpendicular to the axis of the reel 3. One end of the rope first passes through one threading hole 19 in one row, then reaches the opening on the back of the other threading hole 19, and then passes through the other threading hole 19 in the opposite direction. This process is repeated several times to secure the end of the rope to the reel 3. The other end of the rope can be secured to the other row of threading holes 19 in the same manner.

[0048] In this embodiment, an arc-shaped retaining strip 20 is formed on the inner wall of the rotary cover 6. The retaining strip 20 engages with a retaining groove formed on the upper portion of the outer wall of the middle frame, thereby forming a more stable rotational connection between the rotary cover 6 and the retaining strip 20. Furthermore, a first buckle block 21 is formed on the lower portion of the outer wall of the middle frame 2, and a second buckle block 22 is formed on the inner wall of the base 1 to engage with the first buckle block 21, further securing the base 1 to the middle frame 2.

[0049] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A knob-type rope tensioning device, comprising a fixed base (1), a middle frame (2) fixed relative to the base (1), a winding wheel (3) rotatably arranged on the base (1), a first ratchet (4) matched with the middle frame (2), a winding wheel control tooth (5) movably connected to the first ratchet (4), and a rotary cover (6), wherein a rope is wound around the winding wheel (3), and characterized in that: The middle frame (2) is provided with a first ratchet disc (7), the first ratchet teeth (4) are engaged with the first ratchet disc (7), so that the first ratchet teeth (4) can only rotate in one direction, the winding wheel (3) is provided with a second ratchet disc (8), the winding wheel control teeth (5) can be engaged with or separated from the second ratchet disc (8), the bottom surface of the rotary cover (6) is provided with a connecting disc (9) for controlling the engagement or separation of the winding wheel control teeth (5) and the second ratchet disc (8), the connecting disc (9) is provided with a connecting groove (10), the winding wheel control teeth (5) are provided with a connecting column (11), and the connecting column (11) is movably arranged in the connecting groove (10); The connecting groove (10) includes a first limit point (14) and a first arc surface (15). When the connecting disk (9) rotates clockwise, the connecting column (11) moves along the first arc surface (15) to the first limit point (14), and the second end of the winding wheel control tooth (5) rotates to engage with the second ratchet disk (8). In the process of synchronous rotation with the connecting disk (9), the second ratchet disk (8) is driven to rotate clockwise. When the connecting disk (9) rotates counterclockwise, the connecting column (11) slides along the first arc surface (15), so that the second end of the winding wheel control tooth (5) is separated from the second ratchet disk (8).

2. A knob-type rope elastic device according to claim 1, characterized in that: A movable groove (12) is provided on the first ratchet (4); the winding wheel control tooth (5) is movably arranged in the movable groove (12) and the first end is rotationally connected to the first ratchet (4); the second end of the winding wheel control tooth (5) is a tooth surface and corresponds to the second ratchet disc (8); the winding wheel control tooth (5) switches to a state of engagement or separation with the second ratchet disc (8) when rotating in the movable groove (12).

3. The knob-type rope elastic device according to claim 1, characterized in that: When the connecting disc (9) rotates 45 degrees counterclockwise, the second end of the winding wheel control tooth (5) is separated from the second ratchet disc (8).

4. The knob-type rope tensioning device according to claim 1, characterized in that: A limiting protrusion (16) is also formed at a position of the connection groove (10) close to the first limit point (14), and the limiting protrusion (16) is used to provide resistance when the rotary cover (6) rotates counterclockwise.

5. The knob-type rope tensioning device according to claim 1, characterized in that: A transmission protrusion (23) is also formed on the first ratchet (4), and the connecting disk (9) has a first contact surface (24) corresponding to the transmission protrusion (23). The connecting disk (9) rotates clockwise until the first contact surface (24) contacts the transmission protrusion (23), thereby driving the first ratchet (4) to rotate synchronously. The connecting disk (9) also has a second contact surface (25) corresponding to the transmission protrusion (23). The connecting disk (9) is limited when it rotates counterclockwise until the second contact surface (25) contacts the transmission protrusion (23).

6. The knob-type rope tensioning device according to claim 1, characterized in that: The winding wheel (3) comprises a winding wheel upper layer and a winding wheel lower layer, the second ratchet disc (8) is located on the winding wheel upper layer, and the rope is connected to the winding wheel lower layer.

7. The knob-type rope tensioning device according to claim 6, characterized in that: The middle frame (2) is further provided with a wire groove (18), and the two ends of the rope belt respectively enter from the corresponding wire groove (8) and are fixed to the winding wheel (3).

8. The knob-type rope elastic device according to claim 7, characterized in that: The lower layer of the winding wheel (3) is provided with a plurality of threading holes (19) for fixing the ends of the rope.

9. The knob-type rope tensioning device according to claim 1, characterized in that: An arc-shaped clip (20) is formed on the inner wall of the rotary cover (6), and the clip (20) cooperates with a clip groove formed on the outer wall of the middle frame (2). A first clip block (21) is formed on the lower portion of the outer wall of the middle frame (2), and a second clip block (22) that cooperates with the first clip block (21) is formed on the inner wall of the base (1).

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