A spool and method of coupling a tie-down device and a tie-down strap thereto

Abstract

The application provides a coupling method of a bobbin and a tie and a coupling method of a fastening device containing a bobbin and a tie, first and second tie free ends are threaded along first and second threading paths respectively, the first and second threading paths are separate three-dimensional intersections, and the two free ends will not collide even if they are threaded at the same time; when the tie is knotted, the length of the reserved tail is not strictly required, and even if it is left outside the shell, the remaining tie can be wound on the bobbin by rotating the bobbin without affecting the normal operation of the fastening device, so that the coupling method of the bobbin and the tie is convenient, fast, accurate and low in technical difficulty.

Description

Technical Field

[0001] This invention relates to the field of lacing technology, and more specifically to a coupling method between a spool and a lacing, and a coupling method between a fastening device including a spool and a lacing. Background Technology

[0002] Automatic fastening devices are now widely used in the footwear and bag industry, greatly facilitating people's lives. With the increasing prevalence of these devices, market demand is growing, and simplifying the production and assembly process has become a key focus for fastening device manufacturers. The spool is an essential component of an automatic fastening device, used to wind the strap to tighten or loosen items. The spool is typically an H-beam, consisting of two base plates and a cylinder. The annular groove formed on the outer area of ​​the cylinder between the two base plates constitutes the space for winding the strap. To enable the spool to wind the strap, it needs to be coupled to the spool.

[0003] The commonly used method of coupling spools and ties involves setting a cavity inside the spool and configuring an arc-shaped threading path on the same side to guide the threading. This method is convenient for threading, but there is a possibility of missing threads, and these missing threads are difficult to detect with the naked eye when the product is assembled, which increases the difficulty of inspecting the product for quality. In addition, the setting of the guiding cavity results in a low ties winding capacity for this type of spool.

[0004] Another method of coupling the spool and the tie involves setting a guide slope on one side of the spool tube, which is connected to the external area. After the tie is inserted into the spool tube, it is guided by the guide slope to exit from the chassis opening into the external area of ​​the spool, where it is knotted. Pulling back the tie allows the end of the spool to be contained within the inner cavity of the spool tube. The problem with this coupling process is that although the knotted end is temporarily hidden in the inner cavity of the spool tube after being pulled back, the guide slope occupies the space within the cavity, making it easy for the knot to slip out from the opening. After the spool is assembled with other components of the fastening device, the slipped knot can easily get stuck between the base component and the spool, preventing the spool from rotating freely.

[0005] Therefore, there is an urgent need for a convenient, fast, accurate, and technically simple threading method to couple the tie to the bobbin or a fastening device containing the bobbin. Summary of the Invention

[0006] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one object of this invention is to provide a coupling method between a spool and a tether, comprising the following steps:

[0007] S1. A bobbin is provided, including a bobbin cylinder and a first base and a second base located at opposite ends of the bobbin cylinder. A groove is formed in the outer region of the bobbin cylinder between the first base and the second base for winding a tie. The bobbin cylinder has an inner cavity, and a first threading hole, a second threading hole, a first exit hole, and a second exit hole are provided on the side wall of the bobbin cylinder. The first threading hole and the first exit hole are located on opposite sides of the bobbin cylinder, and the second threading hole and the second exit hole are located on opposite sides of the bobbin cylinder.

[0008] S2. Provide a tie, including a first tie free end and a second tie free end, wherein the first tie free end passes through the first threading hole into the inner cavity of the shaft cylinder, then follows the first threading path to the first threading hole and exits to the outer area of ​​the shaft cylinder; the second tie free end passes through the second threading hole into the inner cavity of the shaft cylinder, then follows the second threading path to the second threading hole and exits to the outer area of ​​the shaft cylinder, and the first threading path and the second threading path are separated and intersected in three dimensions;

[0009] S3. Tie the first tie free end and the second tie free end that exit into the outer area of ​​the shaft cylinder. The knotted tie free end includes the tail and the knot head.

[0010] S4. Pull back the tie so that at least the knot of the tie is pulled back into the inner cavity of the shaft cylinder, and the tie is coupled to the spool.

[0011] The "separated grade-separated intersection" described in this patent, also known as an isolated grade-separated intersection or a non-interconnected grade-separated intersection, refers to an intersection where two paths are not connected. A separated grade-separated intersection includes both complete separation where the upper and lower paths are separated by a distance difference at the spatial intersection, and zero-distance contact between the lower edge of the upper path and the upper edge of the lower path at the spatial intersection. The terms "upper path," "lower path," "upper edge," and "lower edge" are determined based on the actual spatial positions of the two paths when the spool is threaded. Furthermore, the "upper" and "lower" here refer to the spatial intersection, as the vertical relationship between the first and second paths at other spatial locations may differ from that at the spatial intersection. The "spatial intersection" is the point where the projection of the two paths onto a plane parallel to the first or second chassis intersects.

[0012] Preferably, the first chassis and the second chassis are arranged in parallel.

[0013] The shaft cylinder in this patent includes two sides based on a "shaft cylinder symmetry plane," which is a plane established by the "axis of symmetry of the first chassis" and the "central axis of the shaft cylinder." In step S1, "the same side of the shaft cylinder" refers to the same side located on the shaft cylinder symmetry plane, and "opposite sides of the shaft cylinder" refers to two sides located on opposite sides of the shaft cylinder symmetry plane.

[0014] Preferably, the first and second wiring paths are essentially straight lines.

[0015] The phrase "basically a straight line" refers to a straight line or a curve with a very small curvature. "Basically a straight line" means the curvature of the line is equal to or close to 0. Preferably, the curvature of the first or second routing path is less than 0.1. Therefore, both the first and second routing paths are opposing routing paths.

[0016] Therefore, in this patent, the spool's tie passes through the first threading hole and enters the inner cavity of the shaft cylinder, then travels along a first straight path to the first exit hole on the opposite side; that is, the first threading path is a counter-threading path. Similarly, the second threading path is also a counter-threading path. The shorter counter-threading path allows the tie to travel primarily by inertia in its natural state. In contrast, existing technologies use cavities to guide the threading, applying a certain force to force the tie to follow a predetermined arc path. Therefore, counter-threading is more likely to be blind-threaded. Furthermore, with cavities guiding the threading and no observation window, missed threads are easily encountered. Preferably, in S2, the free end of the first tie passes through the first threading hole along the space above, near, or below the central axis of the first threading hole before entering the inner cavity of the shaft cylinder.

[0017] Preferably, in S2, the free end of the second ties passes through the second threading hole and enters the inner cavity of the shaft cylinder via the space above the second threading hole, the area near the central axis, or the space below the second threading hole.

[0018] Here, the space above the threading hole, the area near the central axis, and the space below the threading hole are divided based on the axial height of the threading hole using the central axis of the threading hole as a reference. For example, the area within 20% above and below the central axis is defined as the "area near the central axis". The area above the uppermost edge of the area near the central axis is defined as the space above the threading hole, and the area below the lowermost edge of the area near the central axis is defined as the space below the threading hole.

[0019] Preferably, the centers of the first threading hole and the second threading hole are located at different axial heights on the shaft cylinder. In this patent, "axial height" refers to the distance from a point on the shaft cylinder projected axially onto the lower base. The base located above the spool during actual use is called the "upper base," and the base located below is called the "lower base." Specifically, in this patent, when threading the spool, the first base is the upper base, and the second base is the lower base. The axial height difference between the centers of the first threading hole and the second threading hole allows the first and second threading paths to achieve a separate, three-dimensional intersection.

[0020] In step S2, the order of threading the first tether free end and the second tether free end is not important. The first tether free end or the second tether free end can be threaded in sequence, or the first tether free end and the second tether free end can be threaded at the same time.

[0021] Preferably, in step S2, one of the free ends of the first tie and the second tie passes through the space above the threading hole and enters the inner cavity of the shaft cylinder, while the other free end passes through the space below the threading hole and enters the inner cavity of the shaft cylinder.

[0022] More preferably, in step S2, one of the free ends of the first and second tie straps passes through the uppermost part of the two threading holes and enters the inner cavity of the shaft cylinder, while the other free end of the tie strap passes through the lowermost part of the two threading holes and enters the inner cavity of the shaft cylinder. The uppermost part of the two threading holes refers to the uppermost space of the upper threading hole; similarly, the lowermost part of the two threading holes refers to the lowermost space of the lower threading hole.

[0023] Because the two threading holes are located at different axial heights on the shaft, this patent defines the threading hole at the higher axial height during threading as the upper threading hole, and the threading hole at the lower axial height as the lower threading hole. During threading, the extension direction of the first and second threading paths of the tie is basically determined by the threading direction of the tie within the first or second threading hole. Therefore, by passing one free end of the tie along the top of the upper threading hole into the shaft cavity, and the other free end of the tie along the bottom of the lower threading hole into the shaft cavity, the first and second threading paths can achieve maximum axial spatial separation when the center height difference between the two threading holes is fixed. This is more conducive to reducing the height of the spool and achieving miniaturization of the fastening device.

[0024] In this application, the first wiring path and the second wiring path can both be parallel to the plane on which the first chassis or the second chassis is located, or one of the paths can be parallel to the plane on which the first chassis or the second chassis is located, or neither the first wiring path nor the second wiring path can be parallel to the plane on which the first chassis or the second chassis is located. As long as the two paths can achieve a separated three-dimensional intersection at the spatial intersection point, it is acceptable.

[0025] In a preferred embodiment, at least one of the first wiring path and the second wiring path is parallel to the plane on which the first chassis or the second chassis is located.

[0026] Preferably, the first free end and the second free end of the tether in step S2 are two free ends of one tether or one free end of two tethers.

[0027] Preferably, the first and second threading holes include an inlet end and an outlet end, the size of the outlet end being smaller than the size of the inlet end, and in step S4, the tie is pulled back until the knot of the tie is stuck at the outlet end of the first and second threading holes.

[0028] More preferably, the first and second threading holes are funnel-shaped structures. The smaller end of the funnel-shaped structure is the exit end, which allows the tie to exit the threading hole and enter the inner cavity of the shaft cylinder. In step S4, the tie is pulled back until the knot of the tie is stuck at the exit end of the funnel-shaped threading hole.

[0029] Preferably, the first chassis includes an opening that communicates with the inner cavity of the shaft cylinder. In step S2, the routing of the free ends of the first and second ties in the inner cavity of the shaft cylinder is observed through the opening.

[0030] Preferably, in step S4, the tie is pulled back so that the knot of the tie is pulled back into the inner cavity of the shaft cylinder while the end of the tie remains in the outer area of ​​the shaft cylinder.

[0031] Preferably, when the end of the tie remains in the outer region of the spool, the method further includes step S5: rotating the spool so that the end of the tie is wound around the groove of the spool.

[0032] Preferably, in step S4, the tie is pulled back so that both the knot and the end of the tie are pulled back into the inner cavity of the shaft cylinder.

[0033] Preferably, the end face of the second chassis is further provided with a stop pin.

[0034] Preferably, the stop pin is integrally formed with the spool. The stop pin is positioned on one side of the second base of the spool, eliminating the need for separate pin assembly. This structural design is more conducive to the miniaturization and integration of the fastening device.

[0035] Another object of the present invention is to provide a coupling method for a fastening device including a bobbin and a strap, comprising the following steps;

[0036] S1. A main body of a fastening device is provided, comprising a cap, a housing, and a spool, wherein the housing has an internal region; the cap is rotatably connected to the housing; the spool, for coupling and winding a tie, is rotatably disposed within the internal region of the housing; the spool includes a cylinder and a first base and a second base located at opposite ends of the cylinder, the outer region of the cylinder between the first base and the second base forming a groove for winding the tie; the cylinder has an inner cavity, and the sidewall of the cylinder is provided with a first threading hole, a second threading hole, a first outlet hole, and a second outlet hole, wherein the first threading hole and the first outlet hole are located on opposite sides of the cylinder, and the second threading hole and the second outlet hole are located on opposite sides of the cylinder;

[0037] The housing has a first inlet and a second inlet for the tether to enter from the outer region of the housing to the inner region of the housing; the housing also has a first outlet and a second outlet for the tether to exit from the inner region of the housing to the outer region of the housing; and the first inlet and the first outlet are located on opposite sides of the housing, and the second inlet and the second outlet are located on opposite sides of the housing.

[0038] S2. Rotate the spool so that the first threading hole of the spool is aligned with the first inlet of the housing, the second threading hole of the spool is aligned with the second inlet of the housing, the first outlet hole of the spool is aligned with the first outlet of the housing, and the second outlet hole of the spool is aligned with the second outlet of the housing.

[0039] S3. Provide a tie, including a first tie free end and a second tie free end, wherein the first tie free end passes through the first inlet and the first threading hole and enters the inner cavity of the shaft cylinder, follows the first threading path to the first threading hole, and exits from the first outlet to the outer area of ​​the housing; the second tie free end passes through the second inlet and the second threading hole and enters the inner cavity of the shaft cylinder, follows the second threading path to the second threading hole, and exits from the second outlet to the outer area of ​​the housing, wherein the first threading path and the second threading path are separated and intersected in a three-dimensional manner;

[0040] S4. Tie the first tether free end and the second tether free end that exit into the outer area of ​​the shell. The knotted tether free end includes a tail and a knot head.

[0041] S5. Pull back the tie so that at least the knot of the tie is pulled back into the inner cavity of the shaft cylinder, and the tie is coupled to the main body of the fastening device.

[0042] In step S2, "the first threading hole of the spool is aligned with the first inlet of the housing" does not mean that the center of the first threading hole is aligned with the center of the first inlet in a strict sense. It is sufficient as long as the first inlet can be aligned with a part of the first threading hole. Similarly, all the alignments of "hole to hole" and "hole to opening" in step S2 follow this interpretation. It is sufficient as long as a part of the two are aligned.

[0043] In step S2, "the same side of the shell" refers to the same side located on the shell's plane of symmetry, and "opposite sides of the shell" refers to the two sides located on the shell's plane of symmetry, respectively. Consistent with the aforementioned definition of "both sides of the shaft," the shell also includes both sides based on the "shell's plane of symmetry."

[0044] Preferably, in step S5, the tie is pulled back so that the knot of the tie is pulled back into the inner cavity of the shaft cylinder, while the end of the tie is located in the outer region of the shaft cylinder or the outer region of the housing.

[0045] The end of the tie is located in the outer area of ​​the spool, which means that the end of the tie is located in the inner area of ​​the housing and the outer area of ​​the spool. In other words, the end of the tie is located in the groove of the spool.

[0046] Preferably, in step S5, the tie is pulled back so that both the knot and the end of the tie are pulled back into the inner cavity of the shaft cylinder.

[0047] Having two threading holes on the spool and applying tension to the two free ends of the tie makes the entire tightening device more balanced when the tie is tightened. When the tie is coupled to the spool, the opposing threading method has the advantages of a shorter path, faster threading, and higher accuracy. This is because the tie basically follows the inertial path in its natural state when threading in opposite directions, making blind threading easier. The reason why the current spool structure does not use opposing threading is that the two threading holes of the existing spool are at the same axial height of the spool cylinder. If the two free ends are threaded in opposite directions at the same time, the threading paths on the same plane will collide at the intersection point. Therefore, it is necessary to thread and knot one free end before threading the other free end. This greatly reduces the threading efficiency, and the threading and knotting steps cannot be separated, making it impossible to achieve assembly line operation. In fact, if the knot is too large, the knot pulled back may also hinder the threading of the other free end. In this application, the two opposing threading paths are cleverly designed as a separate, three-dimensional intersection, ensuring that they do not interfere with each other during threading. This greatly improves the accuracy and convenience of threading and effectively avoids mutual interference between the two tie strands. Furthermore, the threading and knotting steps at the free ends of the two tie strands can be performed separately, facilitating streamlined threading operations. In addition, the first chassis is provided with an opening that communicates with the inner cavity of the shaft cylinder, allowing observation of the threading pattern within the shaft cylinder, further enhancing the accuracy and reliability of threading.

[0048] Preferably, according to an embodiment of the present invention, the spool and the housing include alignable marks. In step S2, the spool is rotated in the inner region of the housing such that the alignment marks of the spool are aligned with the alignment marks of the housing, thereby aligning the first threading hole of the spool with the first inlet of the housing, the second threading hole of the spool with the second inlet of the housing, the first outlet hole of the spool with the first outlet of the housing, and the second outlet hole of the spool with the second outlet of the housing.

[0049] Preferably, the fastening device further includes a base, which is installed on the wearable item independently of the main body of the fastening device. In this application, the components of the fastening device other than the base are referred to as the "main body of the fastening device." The main body of the fastening device is used to tighten and loosen the straps, while the main function of the base is to detachably install the fastening device onto the wearable item. Therefore, the fastening device may not have a base, but it must have a main body to perform its fastening function.

[0050] Preferably, the assembly method of the fastening device including the bobbin further includes step S6: providing a base, the base including an inner cavity, and installing the main body of the fastening device coupled with the strap in the inner cavity of the base.

[0051] Furthermore, with the first base side of the spool facing the base, the end of the housing furthest from the screw cap is installed in the inner cavity of the base.

[0052] In this application, the knot of the tie is hidden inside the inner cavity of the shaft cylinder. Because the depth of the inner cavity of the shaft cylinder to the end face of the first chassis is deep enough, the knot of the tie will not protrude from the end face of the first chassis, so the knot will not affect the rotation of the spool. However, in the prior art, the spool structure that uses a guide slope to tie the tie outside the opening of the first chassis has a problem where the guide slope reduces the depth and area of ​​the inner cavity of the shaft cylinder, causing the knot of the tie to run outside the end face of the first chassis. This results in the knot getting stuck between the spool and the base, further preventing the spool from rotating freely and smoothly.

[0053] Preferably, in step S6, the base includes a mounting flange and a retaining wall, the retaining wall protruding from the surface of the mounting flange and surrounding the inner cavity of the base; the main body of the fastening device coupled with a strap is installed in the inner cavity of the base, and at least a portion of the first outlet and the second outlet of the housing are exposed outside the inner cavity of the base.

[0054] Preferably, when the end of the tie remains in the outer area of ​​the housing, step S6 further includes rotating the cap in the direction of tightening the tie, and rotating the spool in the tightening direction, so that the end of the tie located in the outer area of ​​the housing is wound into the groove of the spool.

[0055] Since the first and second outlets of the housing in this application are at least partially exposed outside the inner cavity of the base, even if part of the tail of the strap remains in the outer area of ​​the housing after the strap is pulled back, this part of the strap will be wound into the groove of the spool as the spool rotates, and will not get stuck between the inner cavity of the housing and the base, causing the fastening device to malfunction. Therefore, the coupling of the strap and the fastening device in this application does not require strict regulations on the reserved tail when knotting the strap. The tail of the strap can be short enough to be stored in the inner cavity of the shaft when the strap is pulled back, or it can be long enough to be pulled back into the groove of the spool. Even if it is long enough to remain in the outer area of ​​the housing, the exposed tail can be wound into the groove of the spool by rotating the spool. This will not affect the appearance of the fastening device or its function. Moreover, since the length of the reserved tail is allowed to be within a wide range, no tools are needed, and knotting can be done by hand. Therefore, the knotting process is relatively easier and faster, and the skill requirements for workers are greatly reduced.

[0056] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0058] Figure 1 It is a cross-sectional view of the housing and spool assembly and a threading path diagram of the tie in the prior art;

[0059] Figure 2 It is a top view of another housing and spool assembly in the prior art, as well as a diagram of the threading path of the strap;

[0060] Figure 3 This is a structural schematic diagram of an embodiment of the one-line shaft provided by the present invention;

[0061] Figure 4 yes Figure 3 Front view of the illustrated bobbin embodiment;

[0062] Figure 5 yes Figure 4 A cross-sectional view along the OO direction in the main view of the bobbin shown;

[0063] Figure 6 yes Figure 3 The diagram shows the threading state during the coupling process between the bobbin and the ties.

[0064] Figure 7 yes Figure 6 A top view showing the threading process;

[0065] Figure 8 yes Figure 3 The top view of the spool and tether knot during coupling.

[0066] Figure 9 yes Figure 3 A top view of one embodiment of the spool coupled with the tether.

[0067] Figure 10 yes Figure 3 A top view of another embodiment of the spool coupled with the tether;

[0068] Figure 11 yes Figure 7 The cross-sectional view along JJ in the top view shown;

[0069] Figure 12 yes Figure 3 Top view of the embodiment of the bobbin shown;

[0070] Figure 13 yes Figure 12 Cross-sectional view along the KK direction;

[0071] Figure 14 yes Figure 3 A three-dimensional schematic diagram of the spool embodiment shown after being flipped over;

[0072] Figure 15 yes Figure 14 A cross-sectional view of the spool along the CC direction shown;

[0073] Figure 16 This is an exploded structural diagram of the bobbin-based fastening device provided by the present invention;

[0074] Figure 17 yes Figure 16 A schematic diagram of the rear structure of the assembled fastening device shown.

[0075] Figure 18 yes Figure 16 A schematic diagram of the tightening device after the cap has flipped over;

[0076] Figure 19 yes Figure 16 A schematic diagram of the structure of the tightening device after the housing has been flipped over;

[0077] Figure 20 yes Figure 16 The top view of the assembly structure of the fastening device excluding the base and the threading state during the coupling process of the strap;

[0078] Figure 21 yes Figure 20 The front view showing the threading process;

[0079] Figure 22 yes Figure 21 Cross-sectional view along the DD direction;

[0080] Figure 23 yes Figure 16 The top view of the assembly structure of the fastening device excluding the base and the knotting of the strap during coupling process;

[0081] Figure 24 Figure 16 A top view of an embodiment of the fastening device, excluding the base, coupled with the straps;

[0082] Figure 25 Figure 16A top view of another embodiment of the fastening device, excluding the base, after coupling with the straps;

[0083] Figure 26 Figure 16 A top view of another embodiment of the fastening device, excluding the base, after coupling with the straps;

[0084] Figure 27 This is an exploded structural diagram of another fastening device based on a bobbin provided by the present invention.

[0085] Explanation of icon numbers:

[0086] 1. Bollard; 10. Bollard sleeve; 100. Bollard inner cavity; 11. First base plate; 110. Opening; 12. Second base plate; 120. Slot; 122. Engaging teeth; 123. Elastic stop pin; 13. Groove; 14. Alignment mark; 101, 102. First threading hole, second threading hole; 103, 104. First outlet hole, second outlet hole; 2. Base; 21. Mounting flange; 22. Retaining wall; 20. Base inner cavity; 3. 31, 32, First inlet, second inlet; 33, 34, First outlet, second outlet; 35, Alignment mark; 36, Angled stop; 4, Pawl ring; 4', Telescopic swing arm ring; 5, 5', Screw cap; 51, 51', Retaining ring component; 511, Retaining ring; 512, Engaging teeth; R1, First wiring path; R2, Second wiring path; T11, T21, Tail end of the tether; T12, T22, Knot of the tether.

[0087] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0088] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0089] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," and "radial," 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 invention 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 invention.

[0090] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0091] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0092] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0093] Prior Art 1

[0094] Reference Figure 1 Currently, a widely used type of spool 1310 has a first channel 1316 and a second channel 1314 internally. Its coupling method with the tie is as follows: the tie 1360 passes sequentially through the first channel 1316 and the second channel 1314, and exits through the outlet 1324. However, this spool threading method also has drawbacks:

[0095] Firstly, the ties are prone to being worn through. For example... Figure 1 As shown, the free end of the tie 1370 does not pass through the first channel 1316 and the second channel 1314. This is because the guidance of the tie by the first channel 1316 and the second channel 1314 alters the natural state and inertial routing of the tie, forcibly deflecting it to follow a predetermined path. This results in the tie sometimes not following the predetermined path, but instead entering from the housing inlet 1322 and passing directly through the annular groove of the spool 1310 (shown by the dashed line) and then exiting from the housing outlet 1324. This threading method does not achieve coupling between the tie 1370 and the spool 1310. Moreover, this incorrect threading method is difficult to observe with the naked eye because the stop pin is installed through the center of the spool's inner cavity, making it impossible to see the routing inside the spool's inner cavity.

[0096] Secondly, to form the first and second channels inside the spool, the internal cavity of the spool must be large enough. A large internal space on the spool leads to an increase in the outer diameter of the cylinder, resulting in a relatively small storage space for the annular groove and a lower winding capacity for the ties.

[0097] Third, the housing outlet 1324 of the fastening mechanism is installed inside the cavity of the base component. Figure 1 (Not shown), and the gap between the base component's retaining wall and the housing outlet is particularly small. Therefore, if the tail left when knotting the tie is too long, the tail will remain outside the housing outlet. When the housing is installed into the inner cavity of the base component, the exposed tail will get stuck between the base component and the housing, preventing the spool from rotating and the fastening device from working properly. Therefore, this prior art requires very precise knotting of the tie when threading the fastening device, requiring the tail of the tie to be short enough after knotting. This is difficult to achieve by hand and requires the use of tools, thus increasing the difficulty of the tie knotting process.

[0098] Existing technology 2

[0099] Reference Figure 2 Another coupling process between the spool and the tie in the prior art involves a guide slope SL on one side of the spool cylinder, with a tie outlet E on the chassis on this side. The tie passes through the inner cavity of the cylinder, is guided by the guide slope, and exits through the tie outlet E to the outer area of ​​the spool. The tie end is knotted in the outer area of ​​the spool, and then pulled back, causing the knot T to return to the inner cavity of the cylinder. However, in practical applications, because the knot T cannot be fixed in the cylinder and may wander to the outer area of ​​the spool, or because the tail of the knot T is too long and protrudes outside the tie outlet E, in such cases, after the base of the fastening device is assembled with the other components, the exposed knot T or its tail may become stuck between the base and the spool, preventing the spool from rotating freely.

[0100] The reason for this problem is that the thread hole H of the spool cannot fix the knot T, and the knot T can move in the inner cavity of the spool tube. Also, because of the presence of the guide slope SL, the inner cavity of the spool tube becomes smaller. In addition, the depth from the bottom of the inner cavity of the spool tube to the tie outlet E is relatively shallow. The knot T can easily slide along the guide slope SL to the outside of the tie outlet E, and then get stuck between the base and the spool, hindering the rotation of the spool.

[0101] To address the aforementioned problems, the present invention provides a coupling method between a spool and a tie, and an assembly method for a fastening device including the spool. Embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0102] Example 1

[0103] Reference Figure 3 The bobbin 1 for coupling and winding the tie provided in this embodiment of the invention includes a bobbin 10 and a first base 11 and a second base 12 located at opposite ends of the bobbin. The first base 11 and the second base 12 are parallel to each other and extend radially outward relative to the bobbin 10. A groove 13 is formed in the outer region of the bobbin 10 between the first base 11 and the second base 12 for winding the tie.

[0104] like Figure 3-5 As shown, the shaft cylinder 10 has an inner cavity 100. The sidewall of the shaft cylinder 10 has a first threading hole 101, a second threading hole 102, a first outlet hole 103, and a second outlet hole 104. With the symmetry plane S of the shaft cylinder 10 as a reference plane, the first threading hole 101 and the first outlet hole 103 are located on opposite sides of the shaft cylinder 10 (i.e., on opposite sides of the reference plane S), and the second threading hole 102 and the second outlet hole 104 are also located on opposite sides of the shaft cylinder 10. Further, as... Figure 4 and Figure 5 As shown, the first threading hole 101 and the second threading hole 102 are located at different axial heights on the shaft cylinder, and the axial height difference between the centers of the two threading holes 101 and 102 is d; furthermore, the projection lines of the central axis S1 of the first threading hole 101 and the central axis S2 of the first outlet hole 103 on the plane of the first chassis 11 are parallel to each other, making it possible to thread the wire in opposite directions, and even if the first free end L1 and the second free end L2 of the strap are threaded at the same time, the first wiring path R1 and the second wiring path R2 can also be freely routed in space without colliding with each other, presenting Figure 6 and Figure 11 The diagram shows a split, three-dimensional crossover configuration. The first wire hole 101 and the second wire hole 102 have a trumpet-shaped structure, and the size of the exit end Ex of the wire holes 101 and 102 is smaller than the size of the entry end En.

[0105] Reference Figure 6-11 The coupling method between the tether and the spool includes the following steps:

[0106] S1. Arrange the spools according to... Figure 3 The orientation shown is as follows: the first base 11 is on top, the first wire hole 101 and the second wire hole 102 face the front, and the first wire outlet hole 102 and the second wire outlet hole 104 are located on the back.

[0107] S2, provides a lacing strap, such as Figure 6-7 As shown, it includes a first free end L1 and a second free end L2 of the tie strap. The first free end L1 passes through the first threading hole 101 into the inner cavity 100 of the shaft cylinder 10, then follows the first wiring path R1 to the first exit hole 103 and exits to the outer area of ​​the shaft cylinder. The second free end L2 passes through the second threading hole 102 into the inner cavity 100 of the shaft cylinder 10, then follows the second wiring path R2 to the second exit hole 104 and exits to the outer area of ​​the shaft cylinder. The first wiring path R1 and the second wiring path R2 are separated and intersected in a three-dimensional manner. Figure 11 As shown, the second free end L2 of the tie and the first free end L1 have a slight distance difference at the spatial intersection C of the wiring paths R1 and R2. Of course, in other embodiments, the lower edge of the second free end L2 of the tie and the upper edge of the first free end L1 can be set to make zero-distance contact at the spatial intersection C.

[0108] S3. Reference Figure 8 The first tie free end L1 and the second tie free end L2 that exit into the outer area of ​​the shaft tube are knotted. The knotted tie free ends include tails T11 and T21 and knots T12 and T22.

[0109] S4. Pull back the tie so that at least the knots T12 and T22 of the tie are pulled back into the inner cavity 100 of the shaft cylinder, thus coupling the tie to the bobbin 1. Preferably, the size of the exit end Ex of the threading hole is less than or equal to the size of the knots T12 and T22, so that the knots T12 and T22 pulled back into the inner cavity of the shaft cylinder can be locked at the exit end Ex of the threading hole, which is more conducive to the fixation of the tie. Step S4 includes the following two scenarios:

[0110] S41, pull back the tie, so that the knots T12 and T22 of the tie are pulled back into the inner cavity 100 of the shaft cylinder, while the ends T11 and T21 of the tie remain in the outer area of ​​the shaft cylinder, as shown. Figure 9 As shown.

[0111] S42, pull back the tie, so that the ends of the tie knots T12 and T22 and the tail ends T11 and T21 are all pulled back into the inner cavity 100 of the shaft cylinder, as shown. Figure 10 As shown.

[0112] Furthermore, when the first end L1 and the second end L2 of the strap are threaded in opposite directions along the first threading path R1 and the second threading path R2 respectively, ideally, the central axis of the first threading hole 101 should be collinear with the central axis of the first exit hole 103, and the central axis of the second threading hole 102 should be collinear with the central axis of the second exit hole 104. In this structure, the threading hole and the opposite exit hole are strictly aligned. However, this requires that the first and second exit holes be located at different axial heights of the shaft cylinder, making the structure more complex during machining. Therefore, to facilitate machining, it is sufficient that the strap, after entering the inner cavity of the shaft cylinder through the first threading hole 101, can reach the hole space of the first exit hole 103 along a predetermined straight path, and the strap, after entering the inner cavity of the shaft cylinder through the second threading hole 102, can also reach the hole space of the second exit hole 104 along a predetermined straight path; here, "determined straight path" refers to the threading direction of the strap within the corresponding threading hole. This structure does not have strict requirements on the alignment of the spool's outlet hole with its corresponding threading hole, making it easy to manufacture. For details, refer to... Figure 12-13 The vertical and horizontal relationships of the first threading hole 101, the second threading hole 102, the first outlet hole 103 (not shown), and the second outlet hole 104 are such that, as long as the uppermost edge of the exit end Ex of the first threading hole 101 is not higher than the uppermost edge of the first outlet hole 103 (not shown), and the lowermost edge of its exit end Ex is not lower than the lowermost edge of the first outlet hole 103 (not shown); and the uppermost edge of the exit end Ex of the second threading hole 102 is not higher than the uppermost edge of the second outlet hole 104, and the lowermost edge of its exit end Ex is not lower than the lowermost edge of the second outlet hole 104, then all the ties entering the inner cavity 100 of the shaft cylinder 10 through the first threading hole 101 and the second threading hole 102 can reach the hole area of ​​the opposite outlet hole in a straight line. For easier processing and forming, it is preferable that the dimensions of the outlet holes 103 and 104 are larger than the dimensions of the two threading holes 101 and 102. Figure 13 As shown, in this embodiment, the axial height of the two outlet holes 103 and 104 is approximately equal to the axial height of the groove 13. This ensures that the uppermost and lowermost edges of the exit ends Ex of the two threading holes are located within the hole area of ​​the outlet hole, facilitating shaping. Furthermore, the outlet holes 103 and 104 are sufficiently large to facilitate the smooth pullback of the knotted strap into the inner cavity of the shaft cylinder. More preferably, as... Figure 14 and 15 As shown, in this embodiment, the two outlet holes 103 and 104 are symmetrically arranged about the symmetry plane S of the shaft cylinder 10, that is, the two outlet holes are the same in size and shape, and are both rounded rectangles.

[0113] Furthermore, such as Figure 3As shown, the first chassis 11 includes an opening 110, which communicates with the inner cavity 100 of the shaft cylinder 10, making the entire inner cavity 100 open to the outside. Preferably, in step S2 of coupling the strap and the spool, observing the routing of the first strap free end L1 and the second strap free end L2 in the inner cavity 100 of the shaft cylinder through the opening 110 can improve the accuracy of threading.

[0114] like Figure 14 and 15 As shown, a cylindrical groove 120 is formed at the center of the second chassis 12. An elastic stop pin 123 is provided on the bottom surface of the groove, extending outwards from the spool. Engaging teeth 122 are provided around the periphery of the groove 120 on the end face of the second chassis 12. The bottom surface of the inner cavity of the shaft cylinder 10 is in contact with the bottom surface of the groove 120.

[0115] Reference Figure 3 The spool is also provided with an alignment mark 14, which is preferably an arrow.

[0116] Example 2

[0117] This embodiment provides a fastening device based on the bobbin shown in Embodiment 1, such as... Figure 16 As shown, it includes a base 2, a spool 1, a housing 3, a pawl ring 4, a screw cap 5, and a decorative piece 6. The structure of the spool 1 is the same as that of the spool 1 in Embodiment 1. The decorative piece 6 is disposed on the surface of the screw cap 5. The connection method between the spool 1 and the screw cap 5, the connection method between the screw cap 5 and the housing 3, the structure of the pawl ring 4, and its connection method with the housing 3 can be found in the patent document CN208993976U.

[0118] like Figure 18 As shown, a retaining ring component 51 is integrally formed on the cap 5. The retaining ring component 51 cooperates with the elastic retaining pin 123 of the spool 1 to form a gear switching mechanism for the fastening device. The center of the retaining ring component 51 is a hollow column, and the retaining ring 511 is provided on the inner wall of the hollow column. The retaining ring 511 cooperates with the elastic retaining pin 123 of the spool 1 to realize the gear switching function of the fastening device. A ring of meshing teeth 512 corresponding to the meshing teeth 122 is also provided around the hollow column on the retaining ring component 51. The cap 5 and the spool 1 are detachably connected through the meshing of the meshing teeth. When the meshing teeth are engaged, the rotation of the cap 5 can drive the spool 1 to rotate.

[0119] Furthermore, referring to Figure 19The housing 3 has an internal region I, within which the spool 1 is rotatably disposed. The housing 3 includes two opposing first inlets 31 and second inlets 32, allowing the tether to enter the internal region I from the external region O of the housing 3; both the first inlets 31 and second inlets 32 are lug structures and symmetrically arranged; the housing 3 also has a first outlet 33 and a second outlet 34, allowing the tether to exit from the internal region I of the housing 3 back to the external region O of the housing 3. Wherein... Figure 19 As shown, with the symmetry plane SS of the housing 3 as the reference plane, the first inlet 31 and the first outlet 33 are located on opposite sides of the housing (i.e., on both sides of the reference plane SS), and the second inlet 32 ​​and the second outlet 34 are located on opposite sides of the housing. The housing 3 is also provided with an alignment mark 35, which works in conjunction with the alignment mark 14 of the spool 1 to indicate the alignment position of the housing 3 and the spool 1.

[0120] The coupling method between the fastening device and the strap in this embodiment includes the following steps;

[0121] S1. Assemble the main body of the fastening device by assembling the housing 3, pawl ring 4, and screw cap 5 together as described above. Then, flip the assembled components over and... Figure 20 The housing 3 is placed in the manner shown, with the bottom surface of the housing 3 facing upwards, and then the spool 1 is installed in the inner region I of the housing 3;

[0122] S2. Rotate the spool 1 so that alignment mark 14 aligns with alignment mark 35 on the housing, thereby aligning the first threading hole 101 of the spool with the first inlet 31 of the housing, the second threading hole 102 of the spool with the second inlet 32 ​​of the housing, the first outlet hole 103 of the spool with the first outlet 33 of the housing, and the second outlet hole 104 of the spool with the second outlet 34 of the housing. Figure 20-22 As shown;

[0123] S3. Provide a frenulum, including a first frenulum free end L1 and a second frenulum free end L2, such as Figure 22 As shown, the first tether free end L1 passes through the first inlet 31 and the first wire hole 101 and enters the inner cavity 100 of the shaft cylinder 10. It follows the first wire path R1 to reach the first wire outlet 103 and then exits from the first outlet 33 to the outer region O of the housing. The second tether free end L2 passes through the second inlet 32 ​​and the second wire hole 102 and enters the inner cavity of the shaft cylinder 10. It follows the second wire path R2 to reach the second wire outlet 104 and then exits from the second outlet 34 to the outer region O of the housing. The first wire path R1 and the second wire path R2 are separated and intersected in a three-dimensional manner.

[0124] S4, Reference Figure 23The first tether free end L1 and the second tether free end L2 that exit into the outer region O of the shell are knotted. The knotted tether free ends include tails T11 and T21 and knots T12 and T22.

[0125] S5. Reference Figure 24-26 The tie is pulled back so that at least the knots T12 and T22 of the tie are pulled back into the inner cavity 100 of the shaft cylinder, and the tie is coupled to the main body of the fastening device. Step S5 includes the following three scenarios:

[0126] S51. Reference Figure 24 Pull back the tie, so that the knots T12 and T22 of the tie are pulled back into the inner cavity 100 of the shaft cylinder, while the ends of the tails T11 and T21 of the tie are located in the outer area of ​​the shell.

[0127] S52, Reference Figure 25 Pull back the tie, so that the knots T12 and T22 of the tie are pulled back into the inner cavity 100 of the shaft cylinder. At the same time, the ends of the tie T11 and T21 are located in the inner area of ​​the housing and the outer area of ​​the shaft cylinder. That is to say, the ends of the tie T11 and T21 are located in the groove of the spool.

[0128] S53. Reference Figure 26 Pull back the tie, so that the ends of the tie knots T12 and T22 and the tail ends T11 and T21 are all pulled back into the inner cavity 100 of the shaft cylinder.

[0129] S6. Flip over the main body of the fastening device coupled with the straps, and then install the main body into the inner cavity of the base 2. Specifically, refer to... Figure 16 The base 2 includes a mounting flange 21 and a retaining wall 22. The retaining wall 22 protrudes from the surface of the mounting flange 21 and surrounds the inner cavity 20 of the base 2. The first base side of the coupling spool 1 faces the base 2, and the end of the housing 3 away from the screw cap is installed in the inner cavity 20 of the base 2. In this way, the assembly of the entire fastening device is completed.

[0130] The rear structure of the assembled fastening device is as follows: Figure 17As shown, at least a portion of the first outlet 33 and the second outlet 34 of the housing 3 are exposed outside the inner cavity of the base and are higher than the retaining wall 22. Other structures of the base 2 and its connection method with the housing 3 can be found in patent CN217524127U. The base 2 can be pre-fixed to the item to be fastened, and the main body of the fastening device is coupled with the strap before being installed in the inner cavity of the base. The base 2 can be fixedly installed on shoe uppers, shoe tongues, shoe heels, clothing, hats, or bags. Furthermore, since at least a portion of the first outlet 33 and the second outlet 34 of the housing 3 are exposed outside the inner cavity of the base and are higher than the retaining wall 22, coupling of the strap and the fastening device can be achieved even if the main body of the fastening device is first fixed in the inner cavity of the base 2. This structure facilitates the replacement of the strap without disassembling the fastening device.

[0131] In this embodiment, since the axial height of the inlets 31 and 32 of the housing 3 is relatively large, at least part of the first threading hole 101 of the spool 1 is located in the opening area of ​​the first inlet 31 of the housing 3, and at least part of the second threading hole 102 of the spool 1 is located in the opening area of ​​the second inlet 32 ​​of the housing 3. Thus, when the housing 3 and the spool 1 are aligned, they can be threaded in opposite directions.

[0132] Press the cap, and the fastening device is in the first position. The cap is connected to the spool. Rotate the cap in the direction of tightening the strap, which will cause the spool to rotate in the tightening direction. Even if the end of the strap is located outside the housing, as the spool rotates, the exposed end of the strap is wound into the groove of the spool, and the strap is also wound into the groove of the spool. Pull the cap, and the fastening device is in the second position. At this time, the cap is disengaged from the spool, and the spool can rotate freely. The strap can be loosened by pulling it.

[0133] In this embodiment, the first free end L1 and the second free end L2 of the tether can be the two free ends of one tether, or the one free end of two tethers.

[0134] This embodiment uses the commonly used ratchet-pawl-ratch mechanism as the anti-reverse mechanism. Alternatively, a groove-telescopic swing arm ring-sloping block mechanism can also be used, such as... Figure 27 As shown, the telescopic swing arm ring 4' is fixedly mounted on the housing 3 via a snap-fit ​​structure, and the inclined stop block 36 is integrally formed and mounted on the housing 3. Specifically, the structure of the telescopic swing arm ring-inclined stop block and its anti-reverse mechanism can be found in patent CN216723374U. Furthermore, Figure 27 The fastening device shown is Figure 16 The fastening device shown also has the following differences: the retaining ring component 51' is manufactured separately from the screw cap and then connected together by a snap-fit ​​structure. The retaining ring component 51' also includes a retaining ring and a meshing tooth, and the meshing tooth enables a separable connection between the spool and the screw cap.

[0135] In other embodiments, the anti-reverse mechanism can also adopt the groove-pin elastic component-anti-deviation component in patent CN216256587U, or the swing arm-groove-stop block structure in patent CN215837385. That is to say, this spool structure is suitable for all fastening devices that use elastic stop pins as gear switching mechanisms.

[0136] In this embodiment, the item being fastened can be shoes, clothing, hats, bags, or various bags, etc. The fastened item uses the above-mentioned fastening device to tighten the straps to close the opening. Furthermore, when using the above-mentioned fastening device, all the technical effects of the above-mentioned strapping device can be achieved, which will not be described in detail here.

[0137] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0138] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A coupling method between a spool and a tether, characterized in that, Includes the following steps: S1. A bobbin is provided, comprising a bobbin cylinder and a first base and a second base located at opposite ends of the bobbin cylinder. A groove is formed in the outer region of the bobbin cylinder between the first base and the second base for winding a tie. The bobbin cylinder has an inner cavity, and a first threading hole, a second threading hole, a first exit hole, and a second exit hole are provided on the sidewalls of the bobbin cylinder. The first threading hole and the first exit hole are located on opposite sides of the bobbin cylinder, and the second threading hole and the second exit hole are also located on opposite sides of the bobbin cylinder. The centers of the first threading hole and the second threading hole are located at different axial heights of the bobbin cylinder. The first base includes an opening that communicates with the inner cavity of the bobbin cylinder. S2. A tie is provided, including a first tie free end and a second tie free end, wherein the first tie free end passes through the first threading hole into the inner cavity of the shaft cylinder, then follows the first wiring path to the first wiring outlet hole and exits to the outer area of ​​the shaft cylinder; the second tie free end passes through the second threading hole into the inner cavity of the shaft cylinder, then follows the second wiring path to the second wiring outlet hole and exits to the outer area of ​​the shaft cylinder, the first wiring path and the second wiring path are separated and intersected in three dimensions; and the wiring of the first tie free end and the second tie free end in the inner cavity of the shaft cylinder can be observed through the opening of the first chassis; S3. Tie the first tie free end and the second tie free end that exit into the outer area of ​​the shaft cylinder. The knotted tie free end includes the tail and the knot head. S4. Pull back the tie so that at least the knot of the tie is pulled back into the inner cavity of the shaft cylinder, and the tie is coupled to the spool.

2. The coupling method between the spool and the ties according to claim 1, characterized in that, In step S2, the first free end and the second free end of the tether are either the two free ends of a single tether or the one free end of two tethers.

3. The coupling method between the spool and the ties according to claim 1, characterized in that, The first and second threading holes include an inlet and an outlet, the size of which is smaller than that of the inlet. In step S4, the tie is pulled back until the knot of the tie is stuck at the outlet of the first and second threading holes.

4. The coupling method between the spool and the ties according to claim 1, characterized in that, In step S4, the tie is pulled back so that the knot of the tie is pulled back into the inner cavity of the shaft cylinder while the end of the tie remains in the outer area of ​​the shaft cylinder.

5. The coupling method between the spool and the ties according to claim 1, characterized in that, In step S4, the tie is pulled back so that both the knot and the end of the tie are pulled back into the inner cavity of the shaft cylinder.

6. A coupling method between a fastening device comprising a bobbin and a strap, characterized in that, Includes the following steps; S1. A main body of a fastening device is provided, comprising a cap, a housing, and a spool, wherein the housing has an internal region; the cap is rotatably connected to the housing; the spool, for coupling and winding a tie, is rotatably disposed within the internal region of the housing; the spool includes a cylinder and a first base and a second base located at opposite ends of the cylinder, the outer region of the cylinder between the first base and the second base forming a groove for winding the tie; the cylinder has an internal cavity, and the sidewall of the cylinder has a first threading hole, a second threading hole, a first outlet hole, and a second outlet hole, wherein the first threading hole and the first outlet hole are located on opposite sides of the cylinder, and the second threading hole and the second outlet hole are located on opposite sides of the cylinder; the centers of the first threading hole and the second threading hole are located at different axial heights of the cylinder; the first base includes an opening communicating with the internal cavity of the cylinder; The housing has a first inlet and a second inlet for the tether to enter from the outer region of the housing to the inner region of the housing; the housing also has a first outlet and a second outlet for the tether to exit from the inner region of the housing to the outer region of the housing; and the first inlet and the first outlet are located on opposite sides of the housing, and the second inlet and the second outlet are located on opposite sides of the housing. S2. Rotate the spool so that the first threading hole of the spool is aligned with the first inlet of the housing, the second threading hole of the spool is aligned with the second inlet of the housing, the first outlet hole of the spool is aligned with the first outlet of the housing, and the second outlet hole of the spool is aligned with the second outlet of the housing. S3. A tether is provided, including a first tether free end and a second tether free end, wherein the first tether free end passes through the first inlet and the first threading hole, enters the inner cavity of the shaft cylinder, follows the first wiring path to the first outlet hole, and exits from the first outlet to the outer area of ​​the housing; the second tether free end passes through the second inlet and the second threading hole, enters the inner cavity of the shaft cylinder, follows the second wiring path to the second outlet hole, and exits from the second outlet to the outer area of ​​the housing, wherein the first wiring path and the second wiring path are separately intersecting in three dimensions; and the wiring of the first tether free end and the second tether free end in the inner cavity of the shaft cylinder can be observed through the opening of the first chassis; S4. Tie the first tether free end and the second tether free end that exit into the outer area of ​​the shell. The knotted tether free end includes a tail and a knot head. S5. Pull back the tie so that at least the knot of the tie is pulled back into the inner cavity of the shaft cylinder, and the tie is coupled to the main body of the fastening device.

7. The coupling method between the fastening device and the strap according to claim 6, characterized in that, In step S5, the tie is pulled back so that the knot of the tie is pulled back into the inner cavity of the shaft cylinder, while the end of the tie is located in the outer region of the shaft cylinder or the outer region of the housing.

8. The coupling method between the fastening device and the strap according to claim 6, characterized in that, In step S5, the tie is pulled back so that both the knot and the end of the tie are pulled back into the inner cavity of the shaft cylinder.

9. The coupling method between the fastening device and the strap according to claim 6, characterized in that, The method also includes step S6, providing a base, the base including a mounting flange and a retaining wall, the retaining wall protruding from the surface of the mounting flange and surrounding an inner cavity forming the base; installing the main body of the fastening device coupled with a strap in the inner cavity of the base, and at least a portion of the first outlet and the second outlet of the housing being exposed outside the inner cavity of the base.

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