Orthodontic appliance with traction locking function and orthodontic system

Abstract

The utility model relates to an orthodontic appliance and orthodontic system with traction locking function, which comprises a main body part and a cover body part, the main body part is provided with an arch wire groove, two sides of the arch wire groove form a first working wing and a second working wing, the main body part is also provided with an assembly groove for detachably arranging a traction piece, and the cover body part is provided with a locking part. The traction part comprises a traction section, a locking section and an adaptive section which are connected in sequence, the adaptive section is adaptive to the main body part, at least part of the locking section is located in the assembling groove, and the locking section can deform to limit the arch wire. When the traction function needs to be used, the traction piece is installed in the assembling groove, after the traction piece is assembled in place, the adaptation section is matched with the main body part so that the traction piece can be fixed to the main body part, the traction section protrudes out of the main body part to achieve the traction function, at least part of the locking section is located in the assembling groove, and the locking section deforms to abut against or limit the arch wire. The arch wire is prevented from moving relative to the arch wire groove. When the traction function does not need to be used, the whole traction piece can be detached from the assembling groove.

Description

Technical Field

[0001] This utility model relates to the field of orthodontic technology, and in particular to an orthodontic appliance and orthodontic system with traction and locking function. Background Technology

[0002] During orthodontic treatment, traction hooks are typically used to gradually move a portion of the teeth to the correct position. The ideal orthodontic process is as follows: A first orthodontic appliance with a first traction hook is fixed to the surface of the first tooth, which does not need to be moved. A second orthodontic appliance with a second traction hook is fixed to the surface of the second tooth, which needs to be moved to the correct position. Then, a rubber band is placed on the first and second traction hooks. The elastic force of the rubber band is transmitted to the first and second orthodontic appliances to pull the second tooth to the correct position.

[0003] However, when using traditional orthodontic appliances for correction, at least the following two problems exist:

[0004] 1. The archwire is placed in the archwire slot of the orthodontic appliance. During traction, due to the elastic force of the rubber band, the elastic force is transmitted to the second orthodontic appliance through the second traction hook, forcing the second orthodontic appliance to move the second tooth. At the same time, the elastic force is also transmitted to the first orthodontic appliance through the first traction hook, causing the first orthodontic appliance to also move relative to the archwire, thus affecting the correction effect and prolonging the treatment time.

[0005] 2. Traction hooks are usually formed on the body of orthodontic appliances by welding, bonding or integral molding. When the traction function is not needed, the traction hook protrudes from the body, which can easily cause a foreign body sensation and may also scratch the inner lip lining, causing ulcers. Utility Model Content

[0006] Therefore, it is necessary to provide an orthodontic appliance and orthodontic system with traction locking function that can lock the archwire and is detachable when not in use, in order to address the above-mentioned technical problems.

[0007] An orthodontic appliance with traction and locking function includes a main body and a cover. The main body has an archwire groove that runs through it along the mesiodistal direction, dividing the main body into a first working wing and a second working wing. The cover is movably disposed on the second working wing and can open or close the archwire groove. The main body also has an assembly groove for detachably assembling a traction member. The traction member includes a traction section, a locking section, and an adapter section connected in sequence. The adapter section is adapted to the main body. The locking section is at least partially located within the assembly groove and is deformable to limit the archwire.

[0008] In one embodiment, the mounting groove is connected to the archwire groove, the mounting groove extends along the gingival-maxillary direction, and may or may not penetrate the main body; or

[0009] The assembly groove is connected to the bowwire groove, and the assembly groove extends along the proximal-distal direction and may or may not penetrate the main body.

[0010] In one embodiment, the locking section includes a connecting portion and an elastic protrusion protruding from the connecting portion, the elastic protrusion being capable of deformation to abut or limit the bowwire.

[0011] In one embodiment, the elastic protrusion is capable of abutting the archwire in the gingival-maxillary direction and / or in the labial-lingual direction.

[0012] In one embodiment, the locking segment is provided with a through hole to allow the locking segment to expand or contract radially; or

[0013] The locking section is solid and has an opening groove to allow it to expand or contract radially; or

[0014] The locking section is a hollow column, and the locking section is provided with an opening groove communicating with the hollow part, so that the locking section can expand or contract radially.

[0015] In one embodiment, the locking section includes an elastically deformable portion corresponding to the connection between the mounting groove and the bowwire groove, the elastically deformable portion being capable of deformation to limit the bowwire.

[0016] In one embodiment, the locking section includes an elastic torsion portion corresponding to the connection between the mounting groove and the bowwire groove. The elastic torsion portion is torsionally deformable relative to the mounting groove and the bowwire groove to limit the bowwire.

[0017] In one embodiment, the adapter segment can be bent after passing through the mounting slot; or

[0018] The adapter section is snapped onto the second working wing using a snap-fit ​​method.

[0019] In one embodiment, at least one of the following features is also included:

[0020] The traction section protrudes from the assembly slot;

[0021] The traction section includes an integrally formed rod body and a ball cap body. One end of the rod body is connected to the locking section, and the other end of the rod body is suspended and connected to the ball cap body.

[0022] The traction section, the locking section, and the adapter section are integrally formed;

[0023] The assembly groove is at least partially connected to the bottom wall of the bowwire groove;

[0024] The locking section is also provided with a limiting part at one end near the traction section. The limiting part is used to abut against the first working wing to prevent the traction member from excessively extending into the assembly groove.

[0025] An orthodontic system includes at least one orthodontic appliance and traction element having a traction locking function as described in any of the preceding claims, the traction element being detachably mounted in a mounting slot.

[0026] The above-mentioned orthodontic appliances with traction locking function have at least the following advantages:

[0027] During orthodontic treatment, when traction is required, the traction element is installed in the mounting slot. After assembly, the adapter section fits into the main body to fix the traction element to the main body. At this time, the traction section protrudes from the main body to achieve the traction function. The locking section is at least partially located in the mounting slot. The locking section deforms to abut or limit the archwire, preventing the archwire from moving relative to the archwire slot. Therefore, during traction, the elastic force of the rubber band is transmitted to the second orthodontic appliance through the second traction hook, forcing the second orthodontic appliance to move the second tooth. At the same time, the elastic force is also transmitted to the first orthodontic appliance through the first traction hook. However, because the locking section directly or indirectly limits the archwire, the first orthodontic appliance will not move relative to the archwire or will move only a small distance, thus improving the orthodontic efficiency. When traction is not needed, the entire traction element can be removed from the mounting slot. Attached Figure Description

[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the orthodontic system in the first embodiment;

[0031] Figure 2 for Figure 1 The front view;

[0032] Figure 3 for Figure 1 Side view;

[0033] Figure 4 for Figure 3 A sectional view;

[0034] Figure 5 for Figure 3 A cross-sectional view of the adapter segment after bending in the orthodontic system shown.

[0035] Figure 6 This is a schematic diagram of the orthodontic system in the second embodiment;

[0036] Figure 7 for Figure 6 The front view;

[0037] Figure 8 for Figure 6 Side view;

[0038] Figure 9 for Figure 8 A sectional view;

[0039] Figure 10 for Figure 9 A cross-sectional view of the adapter segment after bending in the orthodontic system shown.

[0040] Figure 11 This is a schematic diagram of the traction component.

[0041] Explanation of reference numerals in the attached figures:

[0042] 10. Orthodontic system; 100. Orthodontic appliance; 200. Traction component; 110. Main body; 120. Cover body; 130. Base plate; 111. Archwire groove; 112. First working wing; 113. Second working wing; 20. Archwire; 140. Assembly groove; 210. Traction section; 220. Locking section; 230. Fitting section; 211. Bar; 212. Ball cap body; 221. Limiting part; 222. Elastic deformation part; 223. Connecting part; 224. Elastic protrusion. Detailed Implementation

[0043] It should be noted that the orthodontic appliances mentioned in this utility model refer to orthodontic brackets or buccal tubes, or other orthodontic appliances with similar functions and structures.

[0044] Unless otherwise stated, the following structural description requires the use of a frame of reference for the maxillary teeth to describe embodiments of the present invention. Therefore, as used herein, terms such as labial, lingual, mesial, distal, occlusal, and gingival, used to describe orthodontic appliances, are relative to the selected frame of reference. However, embodiments of the present invention are not limited to the selected frame of reference and the terms described, as orthodontic appliances can be used with other teeth in the oral cavity and in other directions.

[0045] For example, brackets or buccal tubes can also be coupled to the lingual surface of the teeth and fall within the scope of this invention. Those skilled in the art will recognize that the descriptive terms used herein may not be directly applicable when there are changes in the frame of reference. However, embodiments of this invention are intended to be independent of position and orientation within the oral cavity, and the related terminology used to describe the embodiments is merely to provide clear illustration of the embodiments in the drawings. Similarly, the related terms labial, lingual, mesial, distal, occlusal, and gingival in no way limit this invention to a particular position or orientation.

[0046] The terms labial, lingual, mesial, distal, occlusal, and gingival are industry terms used in orthodontic treatment. Taking an upper jaw tooth as an example, the tooth surface can be roughly divided into six surfaces. The surface of the tooth that occludes with the lower jaw teeth is the occlusal surface; the surface of the tooth that connects to the attached gingival tissue is the gingival surface; the occlusal surface and the gingival surface are opposite each other, and the direction formed by the occlusal surface and the gingival surface is also called the gingio-occlusal direction. The surface of the tooth facing the lips is the labial surface, and the surface of the tooth facing the tongue is the lingual surface; the labial surface and the lingual surface are opposite each other, and the direction formed by the labial surface and the lingual surface is also called the labiolingual direction. The two surfaces of the tooth that contact adjacent teeth are the mesial surface and the distal surface, the difference being their distance from the center; the direction formed by the two is also called the mesiodistal direction, or mesiodistal direction.

[0047] Furthermore, in the description of direction, "lip-tongue direction" generally refers to two directions. However, "lip-tongue direction" specifically refers to a single direction, that is, from the side of the lips to the side of the tongue, and this is used to distinguish them.

[0048] Please see Figures 1 to 5The orthodontic system 10 in the first embodiment includes at least one orthodontic appliance 100 (hereinafter also referred to as orthodontic appliance 100) with traction and locking function and a traction member 200, wherein the traction member 200 is detachably installed on the orthodontic appliance 100 to enable the orthodontic appliance 100 to have the traction and locking function. The following description uses an orthodontic bracket as an example to illustrate the orthodontic appliance 100. Specifically, the orthodontic appliance 100 with traction and locking function includes a main body 110 and a cover 120, with the cover 120 movably disposed on the main body 110. In some embodiments, a base plate 130 is further provided on the bottom surface of the main body 110, and the orthodontic appliance 100 can be bonded to the tooth surface by applying adhesive to the base plate 130. Of course, in other embodiments, the orthodontic appliance 100 can also be a buccal tube.

[0049] Furthermore, the main body 110 is provided with an archwire groove 111, which runs through the main body 110 in a mesiodistal direction. The archwire groove 111 divides the main body 110 into a first working wing 112 and a second working wing 113. The cover 120 is movably disposed on the second working wing 113, and the cover 120 can open or close the archwire groove 111. The archwire groove 111 is mainly used to hold the archwire 20. The archwire 20 transmits torque to the orthodontic appliance 100, and then through the orthodontic appliance 100, it transmits the torque to the teeth, causing the teeth to slowly move to the correct position.

[0050] The main body 110 is also provided with an assembly groove 140, which is connected to the bow wire groove 111. The assembly groove 140 is used to detachably mount the traction member 200. Specifically, the assembly groove 140 is at least partially connected to the bottom wall of the bow wire groove 111, and the height of the top of the assembly groove 140 is equal to or greater than the bottom wall of the bow wire groove 111. Therefore, after the traction member 200 is mounted in the assembly groove 140, it can limit or abut the bow wire 20 to achieve the purpose of locking.

[0051] The traction component 200 includes a traction section 210, a locking section 220, and an adapter section 230 connected in sequence. The adapter section 230 is adapted to the main body 110. In this embodiment, the traction section 210, the locking section 220, and the adapter section 230 are integrally formed, which is simple to manufacture and ensures strength. Specifically, the traction section 210 protrudes from the mounting groove 140, so the traction section 210 is used for the traction attachment to be fitted, thus performing the traction function. The traction section 210 includes an integrally formed rod body 211 and a ball cap body 212. One end of the rod body 211 is connected to the locking section 220, and the other end of the rod body 211 is suspended and connected to the ball cap body 212. The rod body 211 is mainly used for the traction attachment to be fitted, and the ball cap body 212 is mainly used to prevent the traction attachment fitted on the rod body 211 from falling off. The number of ball cap bodies 212 can be at least one, for example, one, two, or more.

[0052] The adapter segment 230 is adapted to the main body 110 to mount the traction member 200 onto the main body 110. Specifically, in this embodiment, the adapter segment 230 is adapted to the second working wing 113, and the adapter segment 230 can bend after passing through the mounting groove 140. Correspondingly, the mounting groove 140 extends along the gingival direction and penetrates the main body 110, and the adapter segment 230 bends after passing through the mounting groove 140, such as... Figure 5 As shown. Of course, in other embodiments, the assembly groove 140 may also extend along the proximal-distal direction and penetrate the main body 110, and the adapter section 230 may bend along the direction close to the first working wing 112 or close to the second working wing 113 after passing through the assembly groove 140.

[0053] Alternatively, in other embodiments, the adapter segment 230 is not bent, but is installed into the assembly groove 140 by means of threads. In this case, the assembly groove 140 may or may not penetrate the main body 110. Specifically, the adapter segment 230 is provided with external threads, and the second working wing 113 is provided with an adapter groove that communicates with the bowwire groove 111. The adapter groove is provided with internal threads, and the adapter segment 230 and the adapter groove are engaged by means of threads. Alternatively, the adapter segment 230 is snapped onto the second working wing 113 by means of a snap-fit ​​mechanism.

[0054] Furthermore, the locking section 220 is at least partially located within the assembly groove 140, and the locking section 220 is capable of deformation to limit the bow wire 20. Specifically, the limiting of the bow wire 20 includes, but is not limited to, abutting against the bow wire 20, having a clearance between it and the bow wire 20 to restrict the movement of the bow wire 20, etc.

[0055] Please see Figure 4 The locking section 220 includes an elastic deformation portion 222, which corresponds to the connection between the mounting groove 140 and the bowwire groove 111. The elastic deformation portion 222 can deform to limit the bowwire 20. Specifically, the elastic deformation portion 222 can be arc-shaped or wavy. When the elastic deformation portion 222 extends into the mounting groove 140, it abuts against and tightens the bowwire 20. Since the elastic deformation portion 222 can deform, it can tighten the bowwire 20 through deformation force.

[0056] Please see Figures 6 to 11In the second embodiment, the differences from the first embodiment include, but are not limited to, the locking section 220 including a connecting portion 223 and an elastic protrusion 224 protruding from the connecting portion 223. The elastic protrusion 224 is capable of deformation to abut or limit the bowwire 20. For example, the elastic protrusion 224 can be integrally formed with the connecting portion 223, or the elastic protrusion 224 and the connecting portion 223 can be separately formed, with the elastic protrusion 224 fixedly disposed on the connecting portion 223. The elastic protrusion 224 is mainly used to abut or limit the bowwire 20, and, for example, the elastic properties of the elastic protrusion 224 achieve locking of the bowwire 20.

[0057] Specifically, in the second embodiment, the elastic protrusion 224 can abut against the archwire 20 along the gingival-maxillary direction. For example, in Figures 6 to 11 As shown in the diagram, the elastic protrusion 224 abuts against the archwire 20 along the gingival and occlusal directions. Of course, in other embodiments, the elastic protrusion 224 may also abut against the archwire 20 along the occlusal and gingival directions. Alternatively, in other embodiments, the elastic protrusion 224 may also abut against the archwire 20 along the labial and lingual direction.

[0058] Specifically, in this embodiment, a limiting part 221 is provided at one end of the locking section 220 near the traction section 210. The limiting part 221 abuts against the first working wing 112 to prevent the traction member 200 from excessively extending into the assembly groove 140. Specifically, the width of the limiting part 221 is larger than the width of the assembly groove 140. By providing the limiting part 221, the traction member 200 can be prevented from excessively extending into the assembly groove 140 and losing its traction function.

[0059] In the second embodiment, the mounting groove may not be connected to the bowwire groove. Instead, a locking groove is formed on the main body, which is connected to the bowwire groove. The elastic protrusion is located within the locking groove and directly or indirectly limits the bowwire. For example, the locking groove is formed on the first working wing, and the locking part passes through the locking groove and directly or indirectly limits the bowwire. Alternatively, the locking groove is formed on the second working wing, and the locking part passes through the locking groove and directly or indirectly limits the bowwire.

[0060] Alternatively, in other embodiments, the locking section 220 is provided with a through hole to allow it to expand or contract radially. Alternatively, the locking section 220 is solid and has an opening groove to allow it to expand or contract radially. Alternatively, the locking section 220 is a hollow column with an opening groove communicating with the hollow structure, allowing it to expand or contract radially. In all three embodiments, the archwire 20 is secured by the radial expansion or contraction deformation of the locking end itself.

[0061] Alternatively, in another embodiment, the locking section 220 includes an elastic torsion portion corresponding to the communication between the mounting groove 140 and the bowwire groove 111. The elastic torsion portion is torsionally deformable relative to the mounting groove 140 and the bowwire groove 111 to limit the bowwire 20. For example, when locking the bowwire 20 is not required, the elastic torsion portion does not torsion; when locking is required, the elastic torsion portion torsionally deform and press against the bowwire 20.

[0062] The above-mentioned orthodontic system has at least the following advantages:

[0063] During orthodontic treatment, when traction is required, the traction component 200 is installed in the mounting slot 140. After assembly, the adapter section 230 is fitted to the main body 110 to fix the traction component 200 on the main body 110. At this time, the traction section 210 protrudes from the main body 110 to achieve the traction function. The locking section 220 is at least partially located in the mounting slot 140. The locking section 220 deforms to abut or limit the archwire 20, preventing the archwire 20 from moving relative to the archwire slot 111. Therefore, during traction, the elastic force of the rubber band is transmitted to the second orthodontic appliance 100 through the second traction hook, forcing the second orthodontic appliance 100 to move the second tooth. At the same time, the elastic force is also transmitted to the first orthodontic appliance 100 through the first traction hook. However, since the locking part directly or indirectly limits the archwire 20, the first orthodontic appliance 100 will not move relative to the archwire 20 or will move a very small distance, thus improving the orthodontic efficiency. When the traction function is not needed, the entire traction component 200 can be removed from the assembly slot 140.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0066] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 therefore should not be construed as a limitation of this utility model.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0068] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0069] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0070] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

Claims

1. An orthodontic appliance with traction locking function, characterized in that, The device includes a main body and a cover. The main body has a bowwire groove that runs through it along a mesiodistal direction, dividing the main body into a first working wing and a second working wing. The cover is movably mounted on the second working wing and can open or close the bowwire groove. The main body also has an assembly groove for detachably mounting a traction member. The traction member includes a traction section, a locking section, and an adapter section connected in sequence. The adapter section is adapted to the main body. The locking section is at least partially located within the assembly groove and can deform to limit the bowwire.

2. The orthodontic appliance with traction locking function according to claim 1, characterized in that, The mounting groove is connected to the archwire groove, and the mounting groove extends along the gingival-maxillary direction, and may or may not penetrate the main body; or The assembly groove is connected to the bowwire groove, and the assembly groove extends along the proximal-distal direction and may or may not penetrate the main body.

3. The orthodontic appliance with traction locking function according to claim 2, characterized in that, The locking section includes a connecting portion and an elastic protrusion protruding from the connecting portion. The elastic protrusion is capable of deformation to abut or limit the bowwire.

4. The orthodontic appliance with traction locking function according to claim 3, characterized in that, The elastic protrusion can abut against the archwire in the gingival-maxillary direction and / or in the labial-lingual direction.

5. The orthodontic appliance with traction locking function according to claim 2, characterized in that, The locking section is provided with a through hole to allow the locking section to expand or contract radially; or The locking section is solid and has an opening groove to allow it to expand or contract radially; or The locking section is a hollow column, and the locking section is provided with an opening groove communicating with the hollow part, so that the locking section can expand or contract radially.

6. The orthodontic appliance with traction locking function according to claim 2, characterized in that, The locking section includes an elastic deformation portion that corresponds to the connection between the assembly groove and the bow wire groove. The elastic deformation portion is capable of deformation to limit the bow wire.

7. The orthodontic appliance with traction locking function according to claim 2, characterized in that, The locking section includes an elastic torsion section, which corresponds to the connection between the mounting groove and the bow wire groove. The elastic torsion section is torsion-compatible with the mounting groove and the bow wire groove, and is capable of torsion deformation to limit the bow wire.

8. The orthodontic appliance with traction locking function according to claim 1, characterized in that, The adapter section can be bent after passing through the assembly slot; or The adapter section is snapped onto the second working wing using a snap-fit ​​method.

9. The orthodontic appliance with traction locking function according to claim 1, characterized in that, It also includes at least one of the following features: The traction section protrudes from the assembly slot; The traction section includes an integrally formed rod body and a ball cap body. One end of the rod body is connected to the locking section, and the other end of the rod body is suspended and connected to the ball cap body. The traction section, the locking section, and the adapter section are integrally formed; The assembly groove is at least partially connected to the bottom wall of the bowwire groove; The locking section is also provided with a limiting part at one end near the traction section. The limiting part is used to abut against the first working wing to prevent the traction member from excessively extending into the assembly groove.

10. An orthodontic system, characterized in that, It includes at least one orthodontic appliance and traction member with traction locking function as described in any one of claims 1 to 9, wherein the traction member is detachably installed in the mounting slot.

Images