Antiskid chain

Abstract

The invention provides an antiskid chain. The antiskid chain comprises a chain body, a first tightening device and a supporting piece. The chain body comprises a first chain and a second chain which are arranged at an interval, and the first chain and the second chain are used for being mounted on a crown of a tire; the supporting pieces are arranged in the circumferential direction of the chain body at intervals, and the two ends of each supporting piece are connected with the first chain and the second chain correspondingly, so that the first chain and the second chain are spaced; the first tightening device comprises a flexible part, the flexible part has flexibility and is used for being arranged in the first chain and the second chain in a penetrating mode, and when the flexible part is in a free state, the maximum distance between the first chain and the second chain at the flexible part is smaller than the distance between the first chain and the second chain at the supporting part. According to the antiskid chain, reliable locking force can be provided, the chain body is prevented from falling off in the using process, and the antiskid chain is very convenient to install, use and adjust.

Description

Technical Field

[0001] This application relates to the field of tire anti-skid devices, and in particular to an anti-skid chain. Background Technology

[0002] In winter or inclement weather, roads are prone to icy or snowy conditions. To ensure driving safety, many car owners install snow chains to increase the friction between the tires and the ground, reducing the accident rate. To facilitate the installation of snow chains onto the tires and ensure they are securely fastened, preventing them from slipping off during wheel rotation, a tightening device is typically installed on the snow chain to improve the ease and reliability of installation and removal.

[0003] In the process of developing this application, the inventors discovered that the prior art has at least the following problems: Existing tightening devices often suffer from inconvenience in installation and adjustment, requiring significant time to install or remove during snow chain assembly and disassembly. Furthermore, most existing tightening devices utilize rigid components, with each device offering a fixed adjustment distance for the chain's circumferential dimension. For tires of different sizes, this can lead to a situation where installing too few tightening devices prevents the snow chain from locking securely to the tire, while installing too many devices results in an overly tight chain, posing a safety risk. Summary of the Invention

[0004] Based on this, this application provides an anti-skid chain to improve the problems of inconvenient adjustment of the tightening device and poor reliability of the locking force in the prior art.

[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows: This application provides an anti-skid chain, including a chain body, a first tightening device, and a support member; The chain body includes a first chain and a second chain spaced apart, the first chain and the second chain being used to be mounted on the tire crown; The support members are spaced apart along the circumference of the chain body, and the two ends of the support members are respectively connected to the first chain and the second chain to maintain a gap between the first chain and the second chain; The first tightening device includes a flexible element that is elastic and is used to pass through the first chain and the second chain. When the flexible element is in a free state, the maximum distance between the first chain and the second chain at the flexible element is less than the distance at the support element.

[0006] In one embodiment, the first tightening device further includes an extension member detachably mounted on the flexible member between the first chain and the second chain. After the extension member is mounted, both ends of the extension member abut against the first chain and the second chain, respectively, so that the flexible member located between the first chain and the second chain extends.

[0007] In one embodiment, the number of flexible elements is two or more.

[0008] In one embodiment, the flexible member includes a first blocking portion, a connecting portion, and a second blocking portion arranged sequentially. The radial dimensions of the first blocking portion and the second blocking portion are respectively larger than the radial dimension of the connecting portion. After the flexible member is installed on the chain body, the first blocking portion and the second blocking portion are respectively located on the side of the first chain and the second chain that are far apart from each other.

[0009] In one embodiment, the first blocking portion and / or the second blocking portion are provided with a traction portion, wherein the radial dimension of the traction portion at the end away from the first blocking portion is smaller than the radial dimension at the end near the first blocking portion, and the traction portion is used to pull the first blocking portion or the second blocking portion to pass it into the chain body.

[0010] In one embodiment, the extension includes a body portion with a receiving groove along its length for mounting the flexible member; the two ends of the body portion along its length are respectively provided with slots for abutting against the first chain and the second chain; the minimum distance between the two slots is greater than the length of the connecting portion when the flexible member is in a free state.

[0011] In one embodiment, the body portion is provided with handle portions on two side walls along the width direction, and the handle portions protrude from the two side walls of the body portion.

[0012] In one embodiment, the anti-skid chain further includes a second tightening device, the second tightening device including a first body portion and a second body portion, the first body portion being fixed to the first chain and the second body portion being fixed to the second chain; the second tightening device is configured such that the first body portion and the second body portion are detachably connected to change the spacing formed between the first chain and the second chain at the second tightening device.

[0013] In one embodiment, the anti-skid chain further includes connecting plates and tension bands. The connecting plates are distributed at intervals along the circumference of the chain body, and the number of connecting plates is three or more. The two ends of the connecting plates along the width direction of the chain body are respectively used to connect the tension bands, and the tension bands are used to be installed on both sides of the tire.

[0014] In one embodiment, the number of connecting pieces is four, and the number of tension bands is two sets. Each set of tension bands is located on the same side of all the connecting pieces. Each set of tension bands includes four tension strips. Each pair of adjacent connecting pieces is connected by one tension strip, and the tension strip is an elastic strip with elasticity.

[0015] This application has at least the following advantages: The anti-skid chain provided by this application has a first tightening device that is a flexible element. This flexible element is elastic and passes between the first chain and the second chain. Thus, the elasticity of the flexible element locks the anti-skid chain onto the tire surface, reliably fixing the anti-skid chain and tire, preventing the anti-skid chain from falling off when the wheel rotates. Furthermore, the elasticity of the flexible element can meet the tightening requirements of tires of different sizes, providing a certain degree of tolerance. Simultaneously, since the flexible element is always passed between the first chain and the second chain, it is not necessary to disassemble and reassemble the flexible element each time the anti-skid chain is used. The use of the first tightening device and the adjustment of the circumferential dimensions of the anti-skid chain are very convenient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure when the anti-skid chain is installed on the tire according to an embodiment of this application.

[0017] Figure 2 This is a front view schematic diagram of the anti-skid chain installed on a tire according to an embodiment of this application.

[0018] Figure 3 This is a schematic diagram of the installation structure of the second tightening device and connecting piece with the chain body according to an embodiment of this application.

[0019] Figure 4 This is an exploded structural diagram of the first tightening device and the chain body according to an embodiment of this application.

[0020] Figure 5 This is a schematic diagram of the installation structure of the first tightening device and the chain body according to an embodiment of this application.

[0021] Figure 6 This is a schematic diagram of the structure of a flexible component according to an embodiment of this application (or it could be...). Figure 7 (Schematic diagram of the flexible component after the traction part has been removed).

[0022] Figure 7This is a schematic diagram of the structure of a flexible component according to another embodiment of this application (or it can be...). Figure 6 (Schematic diagram of the flexible component before the traction part is removed).

[0023] Figure 8 This is a schematic diagram of the structure of an extension component according to an embodiment of this application.

[0024] Figure 9 This is a structural schematic diagram from another perspective of the extension of the embodiment of this application.

[0025] Figure 10 This is a schematic diagram of the main structure of the extension component according to an embodiment of this application.

[0026] The meanings of the labels in the attached diagram are as follows: 1. Chain body; 11. First chain; 12. Second chain; 2. First tightening device; 21. Flexible component; 211. First blocking part; 212. Second blocking part; 213. Connecting part; 214. Traction part; 2141. Traction hole; 22. Extending component; 221. Main body; 2211. Receiving groove; 2212. Slot; 222. Handle; 3. Support components; 4. Connecting piece; 41. Through hole; 42. Boss; 5. Tension band; 51. Connecting fabric; 52. Tensioning strip; 6. Second tightening device; 61. First body part; 62. Second body part; 63. Connecting member; 100. Tire; 101. Tire crown. Detailed Implementation

[0027] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the ways in which this application may be implemented. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] In the description of this application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are used 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 therefore should not be construed as a limitation on this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] Please see Figures 1 to 4 The anti-skid chain in this embodiment includes a chain body 1, a first tightening device 2, and a support member 3.

[0032] like Figure 1 and Figure 3 As shown, the chain body 1 includes a first chain 11 and a second chain 12 spaced apart, which are used to mount the first chain 11 and the second chain 12 onto the tread 101 of the tire 100. The first chain 11 and the second chain 12 can be two chains with the same circumference, each chain consisting of several links connected end-to-end to form a closed loop structure. The first chain 11 and the second chain 12 are spaced apart along the width direction of the tread 101 of the tire 100.

[0033] Support members 3 are spaced apart along the circumference of the chain body 1. Both ends of the support members 3 are connected to the first chain 11 and the second chain 12 respectively, maintaining a gap between them. Specifically, the support members 3 can be metal parts. The two ends of the support members 3 can be fixedly connected to the first chain 11 and the second chain 12 by welding, or holes can be provided at both ends of the support members 3, and bolts or other connecting parts can be used to connect them. Of course, other connection methods can also be used to connect the support members 3 and the chain; the specific connection method is not limited. The purpose of setting the support members 3 is to maintain a certain distance between the first chain 11 and the second chain 12, preventing them from sticking together, so that the two chains are evenly distributed on the tire crown 101 of the tire 100, thus better preventing slippage. The support members 3 can be evenly distributed along the circumference of the chain body 1, and the number of support members 3 is not specifically limited and can be selected as needed.

[0034] like Figures 4 to 7 As shown, the first tightening device 2 includes a flexible element 21. The flexible element 21 is elastic and is used to pass through the first chain 11 and the second chain 12. When the flexible element 21 is in a free state, the maximum distance L1 between the first chain 11 and the second chain 12 at the flexible element 21 is less than the distance L2 at the support member 3. The flexible element 21 can be made of elastic materials such as rubber. The flexible element 21 being in a free state means that it is not subjected to external force, i.e., it is at its original length. The maximum distance between the first chain 11 and the second chain 12 at the flexible element 21 refers to the maximum distance that can be reached after the outer sides of the first chain 11 and the second chain 12 abut against the flexible element 21. By making L1 < L2, the flexible element 21 achieves the tightening function of the two chains at its installation point, shortening the total circumferential length of the chains.

[0035] The number of flexible components 21 can be two or more, such as three, four, or five. When one flexible component 21 fails, the remaining flexible components 21, under the action of elasticity, can still ensure a tight fit between the chain body 1 and the tire 100, providing a certain degree of tolerance. Generally, one flexible component 21 can be placed between two support components 3. Of course, if the distance between the two support components 3 is large, more than two flexible components 21 can be placed. When multiple flexible components 21 are used in a snow chain, they should be arranged as centrally as possible within a section of the chain body 1 to avoid them being scattered around the circumference of the chain body 1, thus facilitating the installation of the extension component 22 when the snow chain is subsequently installed onto the tire 100.

[0036] The flexible component 21 includes a first blocking portion 211, a connecting portion 213, and a second blocking portion 212 arranged sequentially. The radial dimensions of the first blocking portion 211 and the second blocking portion 212 are respectively larger than the radial dimension of the connecting portion 213. After the flexible component 21 is installed on the chain body 1, the first blocking portion 211 and the second blocking portion 212 are located on opposite sides of the first chain 11 and the second chain 12. For example, in some embodiments, the first blocking portion 211 and the second blocking portion 212 can be spherical structures, and the connecting portion 213 can be columnar or strip-shaped structures, etc. The radial dimensions of both blocking portions (the first blocking portion 211 and the second blocking portion 212) are larger than the radial dimension of the connecting portion 213. In use, after the flexible component 21 is inserted into the chain body 1, the two links of the first chain 11 and the second chain 12 are sleeved on the connecting portion 213, and the two blocking portions are respectively locked on the outside of the two links. Of course, the two blocking parts and the connecting part 213 can also be other shapes, as long as it is ensured that one of the blocking parts can be inserted into the chain link after deformation, and both blocking parts can restrict the chain link on the connecting part 213. The first blocking part 211 and the second blocking part 212 are respectively located on the side away from each other of the first chain 11 and the second chain 12, which means that the two blocking parts are located on the outside of the first chain 11 and the second chain 12, respectively. For example, when the first blocking part 211 is set close to the first chain 11 and the second blocking part 212 is set close to the second chain 12, the first blocking part 211 is located on the side of the first chain 11 away from the second chain 12, and the second blocking part 212 is located on the side of the second chain 12 away from the first chain 11.

[0037] like Figure 7As shown, in some embodiments, the first blocking portion 211 and / or the second blocking portion 212 are further provided with a traction portion 214. The radial dimension of the end of the traction portion 214 away from the first blocking portion 211 is smaller than the radial dimension of the end closer to the first blocking portion 211. The traction portion 214 is used to pull the first blocking portion 211 or the second blocking portion 212 to pass it into the chain body 1. For example, the traction portion 214 can be a wedge-shaped structure. The traction portion 214 can be provided on only one of the blocking portions, or a traction portion 214 can be provided on each blocking portion. Preferably, the traction portion 214 is provided on only one blocking portion. For example, when the traction portion 214 is provided on the first blocking portion 211, the radial dimension of the end of the traction portion 214 closer to the first blocking portion 211 is larger than the radial dimension of the end away from the first blocking portion 211. The end of the traction portion 214 closer to the first blocking portion 211 can smoothly transition with the first blocking portion 211, and the traction portion 214 and the first blocking portion 211 are integrally formed. To facilitate the traction of the flexible member 21 by the traction part 214, a through traction hole 2141 can be provided on the traction part 214. A traction rope or similar device can be threaded through the traction hole 2141 to achieve the traction of the flexible member 21. To ensure symmetry and balance at both ends of the flexible member 21, the traction part 214 can be removed after the flexible member 21 is threaded into the chain, leaving only the two blocking parts and the connecting part 213 (e.g., Figure 6 (As shown).

[0038] like Figure 4 , Figure 5 and Figures 8 to 10As shown, in some embodiments, the first tightening device 2 further includes an extension member 22. The extension member 22 includes a body portion 221, and the body portion 221 has a receiving groove 2211 along its length direction for mounting the flexible member 21. Slots 2212 are also provided at both ends of the body portion 221 along its length direction, and the slots 2212 are respectively used to abut against the first chain 11 and the second chain 12. The minimum distance L3 between the two slots 2212 is greater than the length of the connecting portion 213 when the flexible member 21 is in a free state (i.e., the maximum distance L1 between the first chain 11 and the second chain 12 at the flexible member 21). The extension member 22 may be made of a rigid plastic or similar material. When the extension member 22 is installed on the chain body 1, a receiving groove 2211 is provided on the surface of the body part 221 near the flexible member 21. The receiving groove 2211 is formed by the inward indentation of this side surface of the body part 221. During installation, the connecting part 213 of the flexible member 21 can be inserted into the receiving groove 2211 as a whole, which facilitates the support of the chain at this point. When installing the extension member 22, the slot 2212 at one end can be first locked onto the chain link, and then the chain on the other side can be pulled to cause the flexible member 21 to extend, so that the chain link on the other side can be locked into the slot 2212 at the other end of the extension member 22. At this time, the connecting part 213 of the flexible member 21 is stretched, increasing the circumferential length of the chain body 1. The extension piece 22 only needs to be installed on the chain body 1 when installing or removing the snow chain. After the snow chain is installed on the tire 100, the extension piece 22 can be removed to prevent the extension piece 22 from being crushed when the wheel rolls, and also to prevent the extension piece 22 from affecting the anti-skid performance of the snow chain.

[0039] To facilitate gripping during installation of the extension component 22, handles 222 can be provided on the two side walls of the main body 221 along the width direction, with the handles 222 protruding from the two side walls of the main body 221. For example, the handles 222 can be positioned at the middle of the main body 221 along the length direction. The main body 221 is formed by extending outward from a portion of the surface of the side wall of the main body 221, allowing the thickness of the handles 222 to be less than the thickness of the main body 221. For instance, the surface of the handle 222 away from the flexible member 21 can be flush with that side surface of the main body 221, while the surface of the handle 222 closer to the flexible member 21 can be further away from the flexible member 21 than that side surface of the main body 221. This makes it easier to grip the handles 222 for quick assembly and disassembly of the extension component 22.

[0040] In some embodiments, the anti-skid chain further includes a second tightening device 6, which includes a first body portion 61 and a second body portion 62. The first body portion 61 is fixed to the first chain 11, and the second body portion 62 is fixed to the second chain 12. The second tightening device 6 is configured such that the first body portion 61 and the second body portion 62 are detachably connected to change the spacing formed between the first chain 11 and the second chain 12 at the second tightening device 6.

[0041] Specifically, in this embodiment, the second tightening device 6 is mainly a rigid adjustment structure, unlike the flexible adjustment structure of the first tightening device 2. The structure of the second tightening device 6 is not limited to the structure described above; it can also be other structures. In this embodiment, the second tightening device 6 mainly adjusts the overall circumferential dimension of the chain body 1 to adapt it to tires 100 of different sizes, avoiding inconvenience caused by excessive use of the first tightening device 2. For example, when the overall circumference of the chain body 1 is long and the tire 100 is small, a certain number of second tightening devices 6 can be installed on the chain body 1 first to adjust the circumference of the chain body 1 to be slightly larger than the circumference of the tire 100, achieving a coarse adjustment. Then, a few first tightening devices 2 can be installed for final fine adjustment. Thus, if the tire 100 size remains unchanged, when the anti-skid chain is used again, there is no need to disassemble or assemble the second tightening device 6; only the flexible component 21 needs to be adjusted using the extender to disassemble or assemble the anti-skid chain. In some embodiments, the extender may not be used; it is used to facilitate the adjustment of the extension and retraction of the flexible component 21. The first body part 61 and the second body part 62 can be detachably connected to the first chain 11 and the second chain 12, for example, by means of a connecting member 63 such as a bolt.

[0042] When both the first tightening device 2 and the second tightening device 6 are installed on the anti-skid chain, the first tightening devices 2 can be clustered together as much as possible. For example, the first tightening devices 2 can be installed only within a certain range around the circumference of the chain body 1, and not installed in other locations. For instance, the first tightening devices 2 can be evenly distributed within one-fifth of the circumference of the chain body 1. The purpose of this arrangement is to facilitate the installation and removal of the extension component 22. The flexible component 21 is located within a small range of the chain body 1, and the flexible component 21 can be positioned on top of or beside the tire 100, or in a position that facilitates the installation of the extension component 22, by rotating the wheel.

[0043] like Figures 1 to 3 As shown, in some embodiments, the anti-skid chain further includes connecting pieces 4 and tension bands 5. The connecting pieces 4 are distributed at intervals along the circumference of the chain body 1, and the number of connecting pieces 4 is three or more. The two ends of the connecting pieces 4 along the width direction of the chain body 1 are respectively used to connect the tension bands 5, which are used to be installed on both sides of the tire 100.

[0044] The connecting piece 4 can be made of PU (polyurethane) or other plastics that are resistant to low temperatures, wear-resistant, and not easily broken. In some embodiments, to better fix the anti-skid chain to the wheel, four or more connecting pieces 4 can be provided, and the connecting pieces 4 are arranged as evenly as possible along the circumference of the anti-skid chain. The connecting piece 4 has grooves near both ends, which are used to accommodate the links of the first chain 11 and the second chain 12, respectively, and the connecting piece 4 and the chain body 1 are fixedly connected by bolts or other connectors. The connecting piece 4 has connecting parts 213 on the outer side of the two grooves, and the connecting parts 213 have through holes 41 for the tension band 5 to pass through. The through holes 41 have protrusions 42 on both sides, which are used to protect the tension band 5 and prevent the tension band 5 from directly contacting the ground when the wheel rotates, so as to extend the service life of the tension band 5.

[0045] In some embodiments, there are four connecting pieces 4 and two sets of tension bands 5. Each set of tension bands 5 is located on the same side of all connecting pieces 4, that is, after the tension bands 5 are installed, they are located on both sides of the tire 100. Each set of tension bands 5 includes four tension strips 52. One tension strip 52 is connected between each pair of adjacent connecting pieces 4. The tension strip 52 is an elastic strip with elasticity, such as a rubber strip, elastic band, or other non-metallic material. To improve the connection reliability of the tension bands 5, the part of the tension band 5 used to connect with the connecting pieces 4 can be made of a non-elastic and wear-resistant woven material, such as nylon cloth. That is, the tension band 5 includes a connecting cloth 51 and tension strips 52. One end of the connecting cloth 51 passes through the groove of the connecting piece 4, and the other end is fixedly connected to the tension strip 52. The installation of snow chains can be further improved by setting tension strips 52. The elasticity of tension strips 52 can quickly fix snow chains to tires 100 without additional operations. The tension bands 5 on both sides of tires 100 are symmetrically arranged, and other structural components are also basically symmetrically distributed, which can improve the installation stability of snow chains and prevent snow chains from shifting due to instability during use.

[0046] The anti-skid chain provided in this application embodiment has a simple overall structure and high reliability. The overall structure is basically symmetrical, which prevents the anti-skid chain from shifting due to instability during use, thus avoiding any impact on its anti-skid effect. The anti-skid chain provided in this application embodiment includes a first tightening device, which comprises a flexible component with elasticity and a detachable extension component. This improves the convenience of installation and use of the anti-skid chain, as well as its reliability. Even if some flexible components fail, the others can still ensure the stable and reliable operation of the anti-skid chain, providing a certain degree of tolerance compared to traditional rigid tightening devices. The combination of the first and second tightening devices effectively improves the dimensional application range and ease of use of the anti-skid chain, making it suitable for various wheel sizes without requiring a separate anti-skid chain for each wheel size, thus offering a wide range of compatible sizes. In addition to the ease of installing the chain body onto the tire surface, the anti-skid chain of this embodiment is also very easy to fix on the tire surface. The anti-skid chain is fixed by the tension bands on both sides. The tension bands are elastic, and after the chain body is installed onto the tire surface, the tension bands can automatically tighten and fix the chain body without any other operation, making it very convenient to use.

[0047] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An anti-skid chain, characterized in that, Includes the chain body, the first tensioning device, and the support components; The chain body includes a first chain and a second chain spaced apart, the first chain and the second chain being used to be mounted on the tire crown; The support members are spaced apart along the circumference of the chain body, and the two ends of the support members are respectively connected to the first chain and the second chain to maintain a gap between the first chain and the second chain; The first tightening device includes a flexible element that is elastic and is used to pass through the first chain and the second chain. When the flexible element is in a free state, the maximum distance between the first chain and the second chain at the flexible element is less than the distance at the support element.

2. The anti-skid chain as described in claim 1, characterized in that, The first tightening device further includes an extension member, which is detachably mounted on the flexible member between the first chain and the second chain. After the extension member is installed, both ends of the extension member abut against the first chain and the second chain, respectively, so that the flexible member located between the first chain and the second chain extends.

3. The anti-skid chain as described in claim 1, characterized in that, The number of flexible components is two or more.

4. The anti-skid chain as described in claim 2, characterized in that, The flexible component includes a first blocking part, a connecting part, and a second blocking part arranged sequentially. The radial dimensions of the first blocking part and the second blocking part are respectively larger than the radial dimension of the connecting part. After the flexible component is installed on the chain body, the first blocking part and the second blocking part are respectively located on the side of the first chain and the second chain that are far away from each other.

5. The anti-skid chain as described in claim 4, characterized in that, The first blocking part and / or the second blocking part are provided with a traction part, the radial dimension of the traction part away from the first blocking part is smaller than the radial dimension of the end close to the first blocking part, and the traction part is used to pull the first blocking part or the second blocking part to pass it into the chain body.

6. The anti-skid chain as described in claim 4, characterized in that, The extension includes a body portion, which has a receiving groove along its length for mounting the flexible component; the two ends of the body portion along its length are also provided with slots for abutting against the first chain and the second chain, respectively; the minimum distance between the two slots is greater than the length of the connecting portion when the flexible component is in a free state.

7. The anti-skid chain as described in claim 6, characterized in that, The main body is provided with handles on two side walls along the width direction, and the handles protrude from the two side walls of the main body.

8. The anti-skid chain as described in any one of claims 1 to 7, characterized in that, It also includes a second tightening device, which includes a first body portion and a second body portion, the first body portion being fixed to the first chain and the second body portion being fixed to the second chain; the second tightening device is configured such that the first body portion and the second body portion are detachably connected to change the spacing formed between the first chain and the second chain at the second tightening device.

9. The anti-skid chain as described in any one of claims 1 to 7, characterized in that, It also includes connecting pieces and tension bands. The connecting pieces are distributed at intervals along the circumference of the chain body, and the number of connecting pieces is three or more. The two ends of the connecting pieces along the width direction of the chain body are respectively used to connect the tension bands, and the tension bands are used to be installed on both sides of the tire.

10. The anti-skid chain as described in claim 9, characterized in that, The number of connecting pieces is four, and the number of tension bands is two sets. Each set of tension bands is located on the same side of all the connecting pieces. Each set of tension bands includes four tension strips. Each pair of adjacent connecting pieces is connected by one tension strip. The tension strip is an elastic strip with elasticity.

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