Automatic tightening shoe and production process thereof

Abstract

The invention discloses an automatic tightening shoe and a production process thereof, belonging to the technical field of footwear, comprising a sole and an upper, the upper comprising a forefoot piece, a rear upper, a tongue piece and an edge piece, the rear upper being connected to the forefoot piece, the rear upper comprising a lining piece, a support piece, a rope tube, a drawstring, an outer cloth piece and a buckle, the support piece being arranged to fit the lining piece, a limiting groove being arranged on the support piece, the drawstring being passed through the rope tube, the outer cloth piece being connected to the lining piece, a pipe groove being arranged on the sole, a mounting groove being arranged on the heel of the sole, a tightening device being arranged in the mounting groove, an opening being arranged on the outer cloth piece, and the buckle being arranged on the opening, the hardness of the support piece can provide good support for the rear upper and the rope tube, so that when the drawstring is tightened, the pulling force will first act on the support piece from the rope tube to disperse the acting force, thereby tightening the upper as a whole, fitting the heel of the user more closely, and also reducing the situation of debonding and line collapse due to concentrated pulling force.

Description

Technical Field

[0001] The invention discloses an automatic tightening shoe and a production process thereof, belonging to the technical field of footwear. Background Art

[0002] Shoelaces are used to adjust the tightness of the shoe upper and ensure the comfort of the foot. Shoelaces have always been fastened by cross-knotting, which is cumbersome and often causes the shoelaces to be too tight, too loose, or loose when walking or exercising, causing a lot of inconvenience. The tie-free shoelace overcomes these problems. Through special design and materials, the shoes do not need to be tied when worn, while maintaining the stability and comfort of the shoes.

[0003] Currently, there is an automatic tightening shoe on the market with patent application number CN200880019973.2. The shoe is provided with a tightening device at the heel, and the shoelaces are wrapped around the upper and extended to the tightening device, so that people can tighten the shoelaces by lifting the heel and rolling the tightening device, which is more convenient for people with bad lumbar vertebrae to use.

[0004] However, the tube for threading the joining rope in the tightening device of the above-mentioned patent is directly fixed in the shoe upper, and the tube is made of soft material, so its supporting effect is insufficient. When the pull rope is tightened, the tightening force points on the rear side of the shoe upper will be concentrated on these two tubes, resulting in the shoe upper not being able to fit the wearer's heel well after tightening, affecting comfort, and the concentrated tension will also increase the probability of debonding or breaking of the two positions. The lack of supporting force will also lead to errors in the installation of the tube and the installation of the upper and the sole during production, resulting in frequent defective products. In order to solve this problem, a new solution needs to be proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic tightening shoe and a production process thereof in order to solve the above-mentioned problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical scheme: an automatic tightening shoe, including a sole and an upper, characterized in that: the upper includes a forefoot piece, a rear piece, a tongue piece and an edge piece, the front edge of the rear piece is connected to the forefoot piece, the edge piece is covered and fixed to the top of the forefoot piece and the rear piece, the tongue piece includes a fixed connecting portion and a tongue body portion, the connecting portion is arranged at the edge of the tongue body portion, the connecting portion 17 is fixed to the forefoot piece, the rear piece includes a lining piece, a port piece, a rope tube, a drawstring, an outer cloth piece and a buckle, the port piece is arranged in contact with the lining piece, and the port piece is provided with A limiting groove for installing a rope tube is provided, and the limiting groove extends from the two ends of the top of the port piece toward the center position of its bottom, the draw rope is passed through the rope tube, the edge of the outer cloth piece is connected to the edge of the inner cloth piece, and the rope tube extends from the bottom of the rear helper to the outside of the rear helper, and a tube groove matching the rope tube is provided on the sole, and an installation groove connected to the tube groove is provided on the heel of the sole, and a tightening device is provided in the installation groove, and openings are provided on both ends of the outer cloth piece, and the hole buckle is provided on the opening and fixed to the outer cloth piece by two sutures, and the draw rope extends from the hole buckle to the outside.

[0007] A production process for automatically tightening shoes, comprising the following steps:

[0008] S1. Fabric processing: select fabric according to the required performance, and punch the upper fabric into the required size and shape of forefoot pieces, lining pieces, outer pieces, tongue pieces and hemming pieces;

[0009] S2, Injection molding processing: Select materials according to the required performance, and perform injection molding and foaming in the mold to form the sole and the shoe parts;

[0010] S3, sampling comparison: simply insert the rope tube into the limit groove of the port piece, and compare the port piece with the sole to determine whether the extended rope tube is aligned with the tube groove. If yes, proceed to the next step of processing, otherwise make modifications;

[0011] S4, back part processing;

[0012] S401, insert the rope tube into the limit groove of the port treasure piece, and the length of the rope tube exceeds the port treasure piece by at least 2 cm;

[0013] S402, sew the lathe-pressed pipe segment on the limit groove on the port fitting to cover the limit groove;

[0014] S403, spray glue on the outer side of the port piece and stick it to the inner side of the outer cloth piece, leaving a 3-5mm hemming clearance difference between the port piece and the bottom of the outer cloth piece;

[0015] S404, insert the eye buckle from the outside of the opening, align the rope tube with the inner end of the eye buckle and trim off the excess part, and then glue the rope tube and the eye buckle together with glue;

[0016] S405, pasting a reinforcing sheet on the inner side of the outer fabric sheet, covering the rope tube and the buckle holes, so that they fit the outer fabric sheet;

[0017] S406, spray glue on the inner side of the port piece, align the inner fabric piece with the outer fabric piece, and bond them to the port piece, and then sew the edges of the inner fabric piece and the outer fabric piece to fix them;

[0018] S407, sewing stabilizing threads on both sides of the button hole to stabilize the position of the button hole;

[0019] S4, sampling comparison: compare the processed back part with the sole to determine whether the extended rope tube is aligned with the tube groove. If yes, proceed to the next step of processing, otherwise, make modifications;

[0020] S5. Upper processing:

[0021] S501, sewing the edges of the back piece and the forefoot piece together to form a complete upper, with the back piece being placed on the outside and the forefoot piece being placed on the inside at the overlapping position;

[0022] S502, sewing the edging piece to the top edge of the upper to cover the seams at the top of the forefoot piece and the back piece;

[0023] S503, aligning the connecting portion of the tongue piece with the inner side of the forefoot piece, bonding the tongue piece, and sewing the trimming line, wherein the trimming line surrounds the edge of the connecting portion, including the portion connected to the tongue body;

[0024] S504, use a molding machine to mold the upper, first heat molding at a temperature of 130-140°C for 13-15 seconds, then cold molding at a cold mold temperature of 0°C for 15-18 seconds;

[0025] S6. Rope tube inspection: First, insert the pull rope into one of the rope tubes extending from the bottom, and then pass it out from the top. If both rope tubes can pass the pull rope, it is qualified;

[0026] S7, connecting the upper and the sole: aligning the rope tube at the bottom of the upper with the tube groove of the sole and inserting it, and bonding the upper and the sole;

[0027] S8, drawstring installation: insert the drawstring from one of the rope tubes through the installation slot, then pass it through the buckle hole, and thread it through the shoelace hole, then insert it from the buckle hole on the other side, and pass it out from the rope tube on the other side;

[0028] S9, installation of the tightening device: pass the drawstring through the installation groove and connect it to the tightening device, and then glue and install the tightening device in the installation groove of the sole.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The upper is composed of a forefoot piece and a rear piece, and the rope tube for passing the draw cord is arranged in the rear piece, and a support piece is arranged in the rear piece. The hardness of the support piece can provide good support for the rear piece. A limiting groove is also arranged on the support piece for installing the rope tube, so the support piece will also support the rope tube. Therefore, when the draw cord is tightened, the tension will first act on the support piece from the rope tube. The support piece has a strong supporting effect and can disperse the force, so that the upper can be tightened as a whole, fits the user's heel better, and also reduces the debonding and line collapse caused by concentrated tension.

[0031] 2. The rope tube is installed by setting a limit groove on the port piece and combining the two inside the rear part. The port piece can support the rope tube, thereby stabilizing the rope tube during the production process, ensuring the installation position of the rope tube and reducing the probability of skewed defective products.

[0032] 3. By configuring the upper to consist of a forefoot piece, a back piece, a tongue piece and an edging piece, and producing the back piece with a composite and internal structure and the forefoot piece that is simply cut separately, the production efficiency is increased, and the edges of the tongue piece are fixed to the forefoot piece and the back piece by bonding or sewing, so that the tongue will not be retracted into the shoe due to the compression of the instep when wearing, thereby further ensuring that the wearer does not need to bend over when wearing the shoe. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the tightening shoe of the present invention;

[0034] Figure 2 It is a schematic diagram of the exploded structure of the tightening shoe of the present invention;

[0035] Figure 3 It is a schematic diagram of the exploded structure of the shoe upper of the present invention;

[0036] Figure 4 It is a schematic diagram of the exploded structure of the rear helper of the present invention.

[0037] Attached figures: 1. sole; 2. upper; 3. forefoot piece; 4. back piece; 5. tongue piece; 6. edging piece; 7. lining piece; 8. port piece; 9. rope tube; 10. draw rope; 11. outer cloth piece; 12. limiting groove; 13. tube groove; 14. installation groove; 15. opening; 16. buckle hole; 17. connecting part; 18. tongue body. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] An automatic tightening shoe, such as Figure 1 As shown, it includes a sole 1 and an upper 2. Figure 2 , Figure 3 As shown, the upper 2 includes a forefoot piece 3, a rear piece 4, a tongue piece 5 and an edging piece 6, wherein the front edge of the rear piece 4 is connected to the rear edge of the forefoot piece 3, and the edging piece 6 is covered and fixed to the top edges of the forefoot piece 3 and the rear piece 4 to increase the aesthetic effect and comfort.

[0040] like Figure 3 As shown, the tongue part 5 includes a connecting portion 17 and a tongue body 18 which are fixed to each other, and the connecting portion 17 is arranged at the edge of the tongue body 18. The connecting portion 17 and the tongue body 18 can be cut from the same piece of cloth as a whole and then hot-pressed, or the two parts can be cut separately and then sewn together. The connecting portion 17 is fixed to the inner side of the forefoot part 3, and the connecting portion 17 is covered by the forefoot part 3, and the tongue body 18 is located at the tongue opening position at the top of the forefoot part 3 and the rear helper part 4. At the same time, the connecting portion 17 is fixed by sewing, and the sewing line is arranged along the edge of the tongue body 18, so that both sides and the bottom of the tongue body 18 will be fixed, and when the wearer wears the shoe, the tongue will not be retracted into the shoe due to the compression of the instep when wearing, further ensuring that the wearer does not need to bend over when wearing the shoe.

[0041] like Figure 4As shown, the rear helper 4 includes a lining piece 7, a port piece 8, a rope tube 9, a drawstring 10, an outer cloth piece 11 and a buckle hole 16 from the inside to the outside, wherein the port piece 8 can be shaped with a pull head and is arranged in close contact with the lining piece 7, and a limiting groove 12 for installing the rope tube 9 is arranged on the side of the port piece 8 away from the lining piece 7, and the limiting groove 12 extends from the top ends of the port piece 8 toward the bottom center position thereof, and the limiting groove 12 can be arranged on the mold, so that the port piece 8 can be directly molded thereon after injection molding, or it can be carried out after the port piece 8 is molded. Slotting, the former has higher production efficiency, and the latter is more convenient for temporarily adjusting the shape of the limit groove 12. The hardness of the port piece 8 can provide good support for the back piece, and the setting of the limit groove 12 also allows the port piece 8 to support the rope tube 9. Therefore, when the pull rope 10 is tightened, the tension will first act on the port piece 8 from the rope tube 9. The port piece 8 has a strong supporting effect and can disperse the force, so that the back piece 4 can be tightened as a whole, fit the user's heel more closely, and also reduce the debonding and line collapse caused by concentrated tension.

[0042] like Figure 2 As shown, the rope tube 9 extends from the bottom of the rear helper 4 to the outside of the rear helper 4, the drawstring 10 is inserted into the rope tube 9, the edge of the outer cloth piece 11 is connected to the edge of the lining cloth piece 7, and the sole 1 is provided with a tube groove 13 that matches the rope tube 9. The tube groove 13 can be adapted according to the specific style, for example, it can be set as two round hole grooves or as a square groove, and the tube groove 13 can also be formed together when the sole 1 is injection molded or cut and grooved after the sole 1 is formed; the heel of the sole 1 is provided with a mounting groove 14 connected to the tube groove 13, and a tightening device is arranged in the mounting groove 14. The tightening device can adopt the device in the patent document with patent number CN200880019973.2 mentioned in the background technology, or other existing rolling tightening device structures using rope tightening. The specific structure of the tightening device is not within the protection scope of the present application, but the shoe structure of the present application is applied to the shoes with the tightening device.

[0043] like Figure 3 , Figure 4 As shown, openings 15 are provided on both ends of the outer fabric sheet 11, and buckles 16 are provided on the openings 15 and fixed to the outer fabric sheet 11 by two stitching lines. The drawstring 10 extends from the buckles 16 to the outside. The buckles 16 protect the openings 15, enhance the strength and stability of the openings 15, prevent cracking, and also make it more convenient to thread the drawstring 10.

[0044] A production process of automatic tightening shoes, used to produce the above-mentioned automatic tightening shoes, includes the following steps:

[0045] S1, fabric processing: select fabric according to required performance, punch the upper fabric 2 into the required size of forefoot piece 3, lining piece 7, outer piece 11, tongue piece 5 and hemming piece 6, wherein the tongue piece 5 is hot-pressed by a hot press to form a connecting part 17 and a tongue body part 18;

[0046] S2, injection molding processing: select materials according to the required performance, and perform injection molding and foaming in the mold to form the sole 1 and the port treasure part 8, open the mold of the sole 1 to form a pipe groove 13 and a mounting groove 14, and open the mold of the port treasure part 8 to form a limit groove 12;

[0047] S3, sampling comparison: simply insert the rope tube 9 into the limit groove 12 of the port piece 8, and compare the port piece 8 with the sole 1 to determine whether the extended rope tube 9 is aligned with the tube groove 13, if yes, proceed to the next step of processing, otherwise modify the port piece 8, and the rope tube 9 can use a standard PU hose;

[0048] S4, processing of back piece 4;

[0049] S401, insert the rope tube 9 into the limiting groove 12 of the port piece 8, the bottom length of the rope tube 9 exceeds the port piece 8 by at least 2 cm, and the top length exceeds the port piece 8 by at least 1 cm;

[0050] S402, sew a pipe pressing piece on the limit groove 12 on the port treasure piece 8 to cover the limit groove 12 and press the rope tube 8. The pipe pressing piece can be made of cloth or soft plastic.

[0051] S403, spray glue on the outer side of the port piece 8, and stick the port piece 8 to the inner side of the outer cloth sheet 11, leaving a 3-5mm hemming clearance difference between the port piece 8 and the bottom of the outer cloth sheet 11 to facilitate the subsequent bottom hemming;

[0052] S404, insert the hole buckle 16 from the outside of the opening 15, align the top of the rope tube 9 with the inner end of the hole buckle 16, trim off the excess part of the top of the rope tube 9 to make it completely aligned with the inner end of the hole buckle 16, and then glue the rope tube 9 to the hole buckle 16 with glue;

[0053] S405, affix a reinforcing sheet to the inner side of the outer cloth sheet 11, cover the rope tube 9 and the hole buckle 16, and make them fit the outer cloth sheet 11. The reinforcing sheet can also be a cloth sheet or a soft plastic sheet;

[0054] S406, spray glue on the inner side of the port piece 8, align the lining piece 7 with the outer piece 11, and bond them to the port piece 8, and then sew the edges of the lining piece 7 and the outer piece 11 to fix them;

[0055] S407, sewing stabilizing threads on both sides of the button hole 16 to stabilize the position of the button hole 16;

[0056] S5, upper 2 processing:

[0057] S501, overlapping the front edge of the rear helper 4 and the rear edge of the forefoot member 3, and then sewing them together to form a complete upper 2, with the rear helper 4 being placed on the outside and the forefoot member 3 being placed on the inside at the overlapping position, and the overlapping length being controlled to be about 3 mm;

[0058] S502, sewing the edging piece 6 to the top edge of the upper 2 to cover the seam at the top of the forefoot piece 3 and the back piece 4 to increase the aesthetic effect and comfort. The edging piece 6 can be made of a cloth piece with a sponge compounded on the inner side;

[0059] S503, aligning the connecting portion 17 of the shoe tongue member 5 with the inner side of the forefoot member 3 and bonding them, and then sewing the trimming line, the trimming line surrounds the edge of the connecting portion 17, including the portion connected to the tongue body 18, so that the bottom and the left and right sides of the tongue body 18 are fixed. Before sewing, the alignment of the connecting portion 17 must be ensured to prevent the tongue body 18 from being skewed after sewing;

[0060] S504, using a setting machine to set the upper 2, first heat setting at a temperature of 130-140°C for 13-15 seconds, and then cold setting at a cold mold temperature of 0°C for 15-18 seconds;

[0061] S6, rope tube 9 inspection: first insert the pull rope 10 into one of the rope tubes 9 extending from the bottom, and then pass it out from the top. If both rope tubes 9 can pass through the pull rope 10, it is qualified;

[0062] S7, connecting the upper 2 and the sole 1: aligning the rope tube 9 at the bottom of the upper 2 with the tube groove 13 of the sole 1 and embedding the upper 2 and the sole 1;

[0063] S8, installation of the draw cord 10: insert the draw cord 10 from one of the rope tubes 9 through the installation slot 14, then pass it out from the hole buckle 16, and pass it through the shoelace hole, then insert it from the other side hole buckle 16, and pass it out from the other side rope tube 9;

[0064] S9. Installation of the tightening device: Pass the drawstring 10 through the installation groove 14 and connect it to the tightening device, and glue the tightening device into the installation groove 14 of the sole 1. After installation, rotate the tightening device to test whether the function of the tightening device is normal and the tightening and loosening status of the drawstring 10.

[0065] Through the above-mentioned manufacturing process, the upper 2 is divided into a rear part 4 with a composite structure and an internal structure and a forefoot part 3 which is simply cut, so that the two can be produced separately and then combined at last, thereby increasing the production efficiency. When adjustment and modification are needed, the structural parts in the rear part 4 can be modified separately before processing and forming, thereby reducing the modification cost. The installation structure and installation steps of the rope tube 9 in the rear part 4 are simple, firm and reliable, which can reduce the probability of defective and skewed finished products and make it more convenient to modify and design different styles and models.

[0066] A limiting groove 12 is provided on the port piece 8 to install the rope tube 9, and the two are combined inside the rear part 4. The port piece 8 can support the rope tube 9, thereby stabilizing the rope tube 9 during the production process, ensuring the installation position of the rope tube 9, and reducing the probability of skewed defective products.

[0067] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0068] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An automatic tightening shoe, comprising a sole and an upper, characterized in that: The shoe upper comprises a forefoot piece, a rear help piece, a tongue piece and an edging piece, wherein the front edge of the rear help piece is connected to the forefoot piece, the edging piece is covered and fixed to the top of the forefoot piece and the rear help piece, the tongue piece comprises a fixed connecting portion and a tongue body portion, the connecting portion is arranged at the edge of the tongue body portion, the connecting portion is fixed to the forefoot piece, the rear help piece comprises a lining piece, a port piece, a rope tube, a drawstring, an outer cloth piece and a buckle, the port piece is arranged in contact with the lining piece, a limiting groove for installing the rope tube is arranged on the port piece, and the limiting groove is formed by the port The top ends of the shoe extend toward the center of its bottom, the draw cord is inserted into the rope tube, the edge of the outer cloth piece is connected to the edge of the lining cloth piece, the rope tube extends from the bottom of the rear helper to the outside of the rear helper, a tube groove matching the rope tube is provided on the sole, a mounting groove connected to the tube groove is provided on the heel of the sole, a tightening device is provided in the mounting groove, openings are provided on both ends of the outer cloth piece, the buckles are provided on the openings, and are fixed to the outer cloth piece by two sutures, and the draw cord extends from the buckles to the outside.

2. A production process for automatic tightening shoes, used for producing the automatic tightening shoes according to claim 1, characterized in that: Including the following processes: S1. Fabric processing: select fabric according to the required performance, and punch the upper fabric into the required size and shape of forefoot pieces, lining pieces, outer pieces, tongue pieces and hemming pieces; S2, Injection molding processing: Select materials according to the required performance, and perform injection molding and foaming in the mold to form the sole and the shoe parts; S3, sampling comparison: simply insert the rope tube into the limit groove of the port piece, and compare the port piece with the sole to determine whether the extended rope tube is aligned with the tube groove. If yes, proceed to the next step of processing, otherwise make modifications; S4, back part processing; S401, insert the rope tube into the limit groove of the port treasure piece, and the length of the rope tube exceeds the port treasure piece by at least 2 cm; S402, sew the lathe-pressed pipe segment on the limit groove on the port fitting to cover the limit groove; S403, spray glue on the outer side of the port piece and stick it to the inner side of the outer cloth piece, leaving a 3-5mm edge difference between the port piece and the bottom of the outer cloth piece; S404, insert the eye buckle from the outside of the opening, align the rope tube with the inner end of the eye buckle and trim off the excess part, and then glue the rope tube and the eye buckle together with glue; S405, pasting a reinforcing sheet on the inner side of the outer fabric sheet, covering the rope tube and the buckle holes, so that they fit the outer fabric sheet; S406, spray glue on the inner side of the port piece, align the inner fabric piece with the outer fabric piece, and bond them to the port piece, and then sew the edges of the inner fabric piece and the outer fabric piece to fix them; S407, sewing stabilizing threads on both sides of the button hole to stabilize the position of the button hole; S5. Upper processing: S501, sewing the edges of the back piece and the forefoot piece together to form a complete upper, with the back piece being placed on the outside and the forefoot piece being placed on the inside at the overlapping position; S502, sewing the edging piece to the top edge of the upper to cover the seams at the top of the forefoot piece and the back piece; S503, aligning the connecting portion of the tongue piece with the inner side of the forefoot piece, bonding the tongue piece, and sewing the trimming line, wherein the trimming line surrounds the edge of the connecting portion, including the portion connected to the tongue body; S504, use a molding machine to mold the upper, first heat molding at a temperature of 130-140°C for 13-15 seconds, then cold molding at a cold mold temperature of 0°C for 15-18 seconds; S6. Rope tube test: First, insert the pull rope into one of the rope tubes extending from the bottom, and then pass it out from the top. If both rope tubes can pass the pull rope, it is qualified; S7, connecting the upper and the sole: align the rope tube at the bottom of the upper with the tube groove of the sole and insert it, and bond the upper and the sole; S8, drawstring installation: insert the drawstring from one of the rope tubes through the installation slot, then pass it through the buckle hole, and thread it through the shoelace hole, then insert it from the buckle hole on the other side, and pass it out from the rope tube on the other side; S9, installation of the tightening device: pass the drawstring through the installation groove and connect it to the tightening device, and then glue and install the tightening device in the installation groove of the sole.

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