shoes

Abstract

To provide shoes that are easy to wear, fit well once worn, and can be manufactured at low cost. [Solution] The shoe comprises a main body 13, an integrally molded product made of a thermoplastic polymer material, including a sole 11 and an upper 12, and a lining K bonded to the inner surface of the main body 13. A convex portion 27, approximately U-shaped in plan view, is integrally formed between a heel storage portion 25 and an ankle storage portion 26 on the inner rear surface of the upper 12. The sole 11 gradually thickens from a central portion 16 to a rear end 17 in the front-to-rear direction, thereby sloping the inner bottom surface of the sole 11 at a constant angle. The heel storage portion 25 is approximately U-shaped in plan view, thick near the center in the left-to-right direction, and gradually thins toward both sides, continuing while curving to wrap around the user's heel. The rear end of the sole 11 is approximately the same thickness as the heel storage portion 25 near the center in the left-to-right direction. A sloped surface 26a, which slopes downward toward the front, is formed above the convex portion 27 on the inner rear surface of the upper 12.

Description

[Technical Field]

[0001] The present invention relates to shoes, particularly shoes made of polymeric materials suitable for use as rain shoes such as rain shoes or rain boots. [Background technology]

[0002] Patent Document 1 discloses rain shoes that include a shoe body integrally molded from soft synthetic resin or soft rubber and a lining fabric bonded to the entire inner surface of the shoe body. To make it easier for the user to put on and take off these rain shoes, an overlap fastener that can widen the opening is provided on the outer side of the upper of the rain shoes.

[0003] Patent Document 2 discloses a footwear article having a heel counter with a built-in heel cup that deforms under the load of the foot when the user wears the footwear and returns to its original shape when the load is removed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3046434 [Patent Document 2] Japanese Patent Application Laid-Open No. 2025-83338 Summary of the Invention [Problem to be solved by the invention]

[0005] The rain shoes in Patent Document 1 are provided with an overlapping fastening section to make them easier for users to put on and take off, but when putting on the rain shoes, the user's foot inserted through the top opening can crush the rear end of the shoe opening, causing deformation. In such cases, it takes time to return the deformed part to its original shape by pulling it with their hands. Also, once the rain shoes have been deformed, the rear part is easily crushed, making them difficult to put on the next time.

[0006] The shoes with the heel cups of Patent Document 2 are less likely to deform at the rear of the shoe, and even if they do deform, they return to their original shape easily. This makes them easy to put on. Furthermore, if a protrusion made of a foam layer is provided on the upper inner surface of the heel cup, it fits the foot well and prevents the shoe from slipping off. However, applying a heel cup to shoes made of thermoplastic polymer material is complicated and difficult to manufacture.

[0007] The object of the present invention is to provide shoes that are easy to put on, fit well once put on, and can be manufactured inexpensively. [Means for solving the problem]

[0008] The shoe of the present invention comprises a main body 13, which is an integrally molded product made of a thermoplastic polymer material and has a sole 11 and an upper 12, and a lining (sock K) bonded to the inner surface of the main body 13. The upper 12 has a heel accommodation section 25 and an ankle accommodation section 26. A convex section 27, which is approximately U-shaped in plan view, is integrally formed between the heel accommodation section 25 and the ankle accommodation section 26 on the inner surface of the rear of the upper 12. The sole 11 is gradually thicker from the central section 16 to the rear end section 17 in the front-to-rear direction, so that the inner bottom surface of the sole 11 is inclined at a certain angle.

[0009] In such shoes, the heel storage compartment 25 preferably has a generally U-shape in plan view, is thicker near the left-right center, and gradually becomes thinner toward both sides, continuing while curving to wrap around the user's heel, and the rear end of the sole preferably has a thickness similar to that of the heel storage compartment near the left-right center. Also, a sloped surface 26a that slopes downward toward the front may be provided above the convex portion 27 on the rear inner surface of the upper 12. In this case, it is preferable that the top of the ankle storage compartment 26 reaches approximately down to the Achilles tendon.

[0010] It is also preferable that the upper part of the rear wall of the ankle storage compartment 26 is elastically deformable so as to tilt rearward under load. It is also preferable that a convex surface 40 of a constant width extending in the vertical direction is provided at the center of the left and right sides of the outer surfaces of the heel storage compartment 25 and the ankle storage compartment 26. It is also preferable that a protrusion 39 is provided on the outer surface of the rear part of the inner wall of the sole 11 or upper 12, and that the upper surface 39a of the protrusion 39 is a flat surface on which the other shoe can be hooked. [Effects of the Invention]

[0011] The shoe of the present invention has an upper equipped with a heel and ankle compartments. A convex portion, approximately U-shaped in plan view, is integrally formed between the heel and ankle compartments on the inner rear surface of the upper, enhancing the rigidity of the rear portion of the upper, making the rear portion less likely to collapse when worn and making it easier to put on. Furthermore, the main body is a one-piece molded product made of a thermoplastic polymer material, and the convex portion is integrally formed, making it easy and inexpensive to manufacture. Furthermore, a lining is provided on the inner surface of the main body, providing a comfortable fit. Furthermore, the sole gradually thickens from the center to the rear end in the front-to-back direction, thereby inclining the inner bottom surface of the sole at a certain angle, achieving both rigidity in the rear portion and flexibility in the front portion. Furthermore, when injection molding, the resin flows smoothly, making molding easier.

[0012] In such shoes, the heel housing is generally U-shaped in plan view, thicker near the center in the left-right direction and gradually thinner toward both sides, continuing to curve around the user's heel. If the rear end of the sole is about the same thickness as the heel housing near the center in the left-right direction, the heel housing firmly supports the protrusion, preventing it from deforming downward. This also makes it easier to grip the heel and ankle, allowing the foot to feel a sense of unity with the shoe. Furthermore, this allows for smooth flow of molten polymer material into the protrusion during injection molding.

[0013] If a downwardly sloping surface is provided above the convex portion on the inner rear surface of the upper, the slope functions as a shoehorn, allowing the foot to slide smoothly into the shoe. In a shoe with a slope provided above the convex portion, if the upper end of the ankle accommodation compartment is located around the Achilles tendon, when the user inserts the foot into the shoe, the heel is supported by the slope and the toes slide along the inner bottom surface of the shoe, allowing the shoe to be put on smoothly.

[0014] If the upper part of the rear wall of the ankle storage section is elastically deformable so that it tilts backward when subjected to load, the opening is flexible, which allows for a wider range of foot insertion angles. In such shoes, the user's foot can be inserted into the shoe at as natural an angle as possible, making it easier to put on.

[0015] If a convex surface of a certain width extending in the vertical direction is provided at the center of the left and right sides of the outer surfaces of the heel storage section and the ankle storage section, the outside of the vertical center of the heel storage section and the ankle storage section will be thick, thereby reinforcing the heel storage section and the ankle storage section.

[0016] If a protrusion is provided on the outer surface of the rear inner part of the sole or upper, and the top surface of the protrusion is a flat surface on which the other shoe can be hooked, the protrusion of one shoe can be pressed against the other shoe when taking off the shoes, making it easier to remove the foot from the one shoe.If the protrusion is provided on the upper, the protrusion is firmly supported by the highly rigid heel storage section.This makes it even easier to take off the one shoe.Furthermore, while taking off one shoe, the heel of the foot can step on the U-shaped convex part in a plan view and press the protrusion of the other shoe with the other shoe, making it easier to take off the other shoe as well. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view showing one embodiment of a shoe according to the present invention; [Figure 2] FIG. 2 is a side view of the shoe of FIG. 1. [Figure 3] FIG. 2 is a plan view of the shoe of FIG. 1. [Figure 4] 4A is a cross-sectional view taken along line IVa-IVa in FIG. 3, and FIGS. 4B and 4C are cross-sectional views taken along line IVb-IVb and line IVc-IVc in FIG. 4A, respectively. [Figure 5] 5A, 5B, and 5C are end views taken along lines Va-Va, Vb-Vb, and Vc-Vc in FIG. 3, respectively, and FIG. 5D is a rear view of the shoe in FIG. [Figure 6] 1 is a cross-sectional view showing an example of a mold for molding shoes according to the present invention. [Figure 7] 10 is an explanatory diagram showing the action of the protrusion and the tongue when a user puts on the shoe. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Next, one embodiment of a shoe according to the present invention will be described with reference to the drawings. Shoe 10 shown in FIG. 1 has a main body 13 made of a relatively thick sole (bottom) 11 and an upper 12 covering the upper part of sole 11. Sole 11 and upper 12 are integrally molded from a thermoplastic polymer material, particularly a thermoplastic resin such as polyvinyl chloride (PVC), polyethylene, or polypropylene, or a thermoplastic elastomer (TPE) or thermoplastic rubber (TPR) such as a polystyrene-based, polyolefin-based, polyvinyl chloride-based, or polyurethane-based material. Thermoplastic polymer materials have a moderate degree of elasticity or flexibility, but are generally soft or have a moderate hardness. A Shore A hardness (Shore hardness scale A) of approximately 45 to 55 is preferred, with a Shore A hardness of approximately 50 being particularly preferred.

[0019] As shown in Figures 4A and 5A, the periphery of the sole 11 and the lower part of the upper 12 are continuous. When the shoe 10 is to be used as a rain shoe or other rain boots, the outer surface is waterproof and water-resistant. The inner surface is covered with a sock-like lining (hereinafter simply referred to as the sock; symbol K in Figure 4A) made of fabric to improve comfort and facilitate removal from the mold. The fabric that makes up the sock K is preferably stretchy, such as a knitted fabric.

[0020] The sole 11 has a structure similar to that of conventional shoes, particularly rain shoes, and is, for example, approximately 10 to 25 mm thick. It may be made elastic and somewhat curved, but as mentioned above, it is essentially a rigid member. The underside 15 of the sole 11 has a mesh-like or concentric pattern of grooves 11a for anti-slip purposes. As shown in FIGS. 2 and 4A, the front portion 14 of the sole 11 is curved upward, and even when the center portion or rear end portion 17 is in contact with the ground FL or floor, the underside 15 of the front portion 14 is not in contact with the ground FL or floor.

[0021] In this embodiment, as can be seen from FIG. 4A, the thickness t1 of the sole 11 at the front portion 14 is thinner than the thickness t2 of the central portion 16 and the thickness t3 of the rear end portion 17. For example, when the thickness t1 of the front portion 14 is 6 mm, the thickness t2 of the central portion 16 is 7.5 to 9.5 mm, preferably 8.5 mm, and the thickness t3 of the rear end portion 17 is 12 to 14 mm, preferably 13 mm. Therefore, when a user wears the shoe 10, the front portion 14 can bend elastically. Furthermore, the thickness of the sole 11 gradually increases from the central portion 16 to the rear end portion 17 (see FIG. 4A). Therefore, the inner surface of the sole 11 slopes at a constant angle so that it becomes higher toward the rear. Furthermore, the thickness t3 at the rear end portion 17 is thicker, making it highly rigid and virtually non-flexible, unlike the front portion 14.

[0022] Upper 12 has toe portion 20 that covers the toes of the user's foot, tongue portion 22 that covers the area from the instep to the lower front of the shin, medial wall 23 that covers the side of the medial side of the foot (toward the big toe), lateral wall 24 that covers the side of the lateral side of the foot (toward the little toe), heel accommodation portion 25 that covers the heel of the foot, and ankle accommodation portion 26 that is roughly U-shaped in plan view and covers the side to the rear of the ankle (see Figures 3 and 4A). As a result, a space S that accommodates the user's foot is formed between upper 12 and sole 11.

[0023] As shown in Fig. 4A, the toe portion 20 has a front wall 21 that is thicker than the front portion 14 of the sole 11, an upper wall 12a that is somewhat thinner than the front wall 21, and a gradually thinner upper wall 12a that is gradually thinner toward the rear, continuing to the tongue 22. The tongue 22 is thin and flexible. As shown in Fig. 3, the tongue 22 is curved so as to be convex toward the front in a plan view, and has a semi-cylindrical shape. Therefore, the tongue 22 has flexibility while maintaining a certain degree of shape retention.

[0024] As shown in Fig. 1, a plurality of eyelets 28 for threading shoelaces X are provided along the front edge 23a of the inner wall 23 and the front edge 24a of the outer wall 24. The eyelets 28 are uneven portions formed integrally with the surfaces of the inner wall 23 and the outer wall 24 and are not separate parts. As shown in Fig. 3, a notch 29 formed between the front edge 23a of the inner wall 23 and the front edge 24a of the outer wall 24 is partially overlapped and closed by the tongue 22 from the underside. The thickness t4 (see Fig. 5B) of the inner wall 23 and the outer wall 24 is, for example, 1.5 to 2.5 mm, and particularly about 2 mm.

[0025] As shown in Figures 1 and 2, a protrusion 39 is provided on the lower rear portion of the inner wall 23. More specifically, the protrusion 39 is a curved portion extending from the side surface to the rear surface of the inner wall 23, and is provided near the lower end of the upper 12. The upper surface 39a of the protrusion 39 is flat so that it can be stepped on with the other shoe. As a result, when taking off the shoes, the foot placed in one shoe 10 can be easily taken off by pressing the protrusion 39 of one shoe 10 with the lower surface 15 of the front or rear inner side of the other shoe. The protrusion 39 can be provided on the sole 11, or it can be provided from the sole 11 to the upper 12, with the same effect being obtained.

[0026] As shown in Fig. 3, in a natural state, the upper ends of the front edges 23a of the inner wall 23 and the front edges 24a of the outer wall 24 are slightly flared outward. As described above, the tongue 22 is curved so as to be convex toward the front in a plan view, but as shown in Figs. 4A and 7, it is curved so as to be convex toward the rear in a side view, and the area near its upper end is curved forward, forming a crescent shape. This, combined with the forward-facing inclined surface 26a provided near the upper end of the rear wall of the ankle accommodation section 26, allows the user to insert their foot smoothly (see Fig. 7).

[0027] The rear of the opening of the shoe 10, i.e., the upper part of the rear wall of the ankle storage compartment 26, is elastically deformable so as to tilt backward under load (see imaginary line 26c in FIG. 4). Therefore, as shown in FIG. 7, when the user puts foot F in, the upper part of the rear wall of the ankle storage compartment 26 can be tilted outward, without the user having to tilt the toes upward, making it easy to put on. Also, as shown in FIGS. 2 and 5D, a convex surface 40 of a certain width extending vertically is provided at the center of the left and right sides of the outer surfaces of the heel storage compartment 25 and the ankle storage compartment 26. This provides a reinforcing effect in addition to a decorative effect, and also prevents the shoe from losing its shape.

[0028] Immediately after molding, the left and right edges 22a of the tongue 22 are continuous with the front edge 23a of the inner wall 23 and the front edge 24a of the outer wall 24, respectively, at a position slightly inward. After molding, the front side is left intact and the continuous rear side is cut off. This results in overlapping portions where the left and right edges 22a of the tongue 22 overlap with the front edge 23a of the inner wall 23 and the front edge 24a of the outer wall 24. Once the left and right edges 22a of the tongue 22 are separated from the inner wall 23 and the outer wall 24, the left and right edges 22a of the tongue 22 can be appropriately tightened by tightening or loosening the shoelace (reference symbol X in FIG. 1 ), allowing the fit to be adjusted.

[0029] As shown in Figures 4A and 4C, heel housing 25 is three-dimensionally curved to accommodate the user's heel, and its inner surface 25a is recessed into a roughly spherical shape. As shown in Figure 3, heel housing 25 has a roughly U-shaped planar shape that opens at the front. As shown in Figure 3, inner surface 25a also has a roughly U-shaped planar shape, rising almost vertically from sole 11 or with a slight upward tilt toward the rear, as shown in Figure 4A, and protruding more forward as it goes up from the middle. On the other hand, outer surface 25b of heel housing 25, like inner surface 25a, curves more forward as it goes up, but the curve is more gradual than inner surface 25a. As a result, heel housing 25 is somewhat thin near the center in the height direction and thickens as it goes up (see Figures 4B and 4C).

[0030] In this embodiment, heel accommodation portion 25 has a generally U-shaped plan view and includes thick portion 25c that curves continuously from sole 11 to protrusion 27 (described later) to encase the user's heel (see FIG. 4C). Thick portion 25c has a thickness t5 of, for example, approximately 9.5 to 11.5 mm, particularly approximately 10.5 mm, near the center. As can be seen from FIGS. 4B and 4C, thick portion 25c is thickest in the left-right direction at the rearmost position, i.e., near center N in the left-right direction. It then curves forward while gradually thinning toward inner wall 23 and outer wall 24, and continues to inner wall 23 and outer wall 24, respectively. That is, heel accommodation portion 25 has a generally U-shape that is open at the front in plan view, and the area below the center in the left-right direction of thick portion 25c of heel accommodation portion 25 is approximately the same as or 1.2 to 1.5 times thicker than thickness t3 of the rear end of sole 11, and the thinner portion of heel accommodation portion 25 is located outside thick portion 25c. Thick portion 25c has high rigidity and supports the weight of the user acting on protrusion 27, which will be described later, and suppresses deformation of heel accommodation portion 25 and protrusion 27, which will be described later.

[0031] As shown in FIGS. 3 and 4A, the ankle accommodation portion 26 is a cylindrical portion that extends continuously upward from the upper end of the heel accommodation portion 25, has a generally U-shaped planar cross section, and is cut out at the front. The inner surface of the ankle accommodation portion 26 is provided with an inclined surface 26a that slopes downward toward the front. Therefore, the inner surface of the connection between the heel accommodation portion 25 and the ankle accommodation portion 26 forms a protrusion 27 that protrudes forward. In other words, the inclined surface 26a is provided above the protrusion 27 on the inner surface of the rear part of the upper 12. The tip of the protrusion 27 has a smooth arc shape in cross section. The protrusion 27 also has a generally U-shaped plan view that is open at the front (see FIG. 4B).

[0032] The inclination angle θ of the inclined surface 26a of the ankle storage section 26 is approximately 65° to 75°, particularly approximately 70°, relative to the horizontal. The length of the inclined surface is approximately 40 to 60 mm, particularly approximately 45 to 55 mm. It is preferable to lengthen the inclined surface 26a in accordance with the length of the ankle storage section 26. This makes it easy to wear high shoes such as boots or rain shoes.

[0033] Meanwhile, the outer surface 26b of the ankle housing 26 curves upwards, concavely curved forward in side view, causing the ankle housing 26 to become thinner as it goes up. The thickness t6 of the protruding portion 27 between the ankle housing 26 and the heel housing 25 is quite thick, for example, about 14.5 to 16.5 mm, particularly about 15.5 mm. Therefore, the lower portions of the heel housing 25 and the ankle housing 26 are highly rigid and barely deform even when stepped on by the user. Furthermore, the thickness t5 of the protruding portion 27 is supported by the thick portion 25c, thereby preventing the heel housing 25 from buckling.

[0034] 3, the left and right ends of ankle accommodation section 26 are continuous with the rear parts of inner wall 23 and outer wall 24. The area near the top end of ankle accommodation section 26 is relatively thin, about the same thickness as inner wall 23 and outer wall 24. Therefore, the area near the top end of ankle accommodation section 26 is flexible and elastic, just like the areas near the top ends of inner wall 23 and outer wall 24.

[0035] Such a shoe 10 can be manufactured in two injection molding steps. The first injection molding step primarily forms the upper 12, and the second injection molding step forms the sole 11. FIG. 6 is a side cross-sectional view of a mold 32 used in the second injection molding step. The mold 32 has a base 33, an inner mold M fixed on the base 33, and an outer mold C attached so as to be able to move toward and away from the inner mold M. The so-called sock tightly fitted around the inner mold M is omitted from FIG. 6. The outer mold C includes a right part P2, a left part (not shown), and a sole part P4 fitted onto the upper end of the inner mold M. The cavity 36a and gate G1 of the sole part P3 used in the first injection molding step are indicated by imaginary lines. In this mold 32, an air discharge channel 34 is formed in the inner mold M. The right part P2 and the left part P1 are supported rotatably around a vertical axis, for example, by supports 35 extending from the base 33. This allows the left and right parts P1 and P2 to be easily moved closer to and away from the inner mold M (opening and closing operation). Note that all parts other than the sole parts P3 and P4 are the same as those in the mold for the first injection molding.

[0036] Gates G1 and G2, which inject molten resin into cavities 36 and 36a, are located at the highest positions of cavities 36 and 36a, and are inclined downward toward the front in front of front gate G1, and gradually downward toward the rear behind rear gate G2. That is, the angles of inner mold M and outer mold C are set to allow for such an inclination. This allows sole 11 to be smoothly formed so that it gradually becomes thicker from center portion 16 to rear end portion 17.

[0037] The cavity 36 of the sole part P4 for the second injection molding has an upper surface formed with a concave-convex pattern for forming the grooves (reference numeral 11a in FIG. 1) of the sole. The sole part P3 for the first injection molding and the sole part P4 for the second injection molding are each supported by a support shaft (not shown) extending substantially horizontally so as to be rotatable about a horizontal axis, allowing them to be opened and closed relative to the inner mold M.

[0038] 7 shows the movement of the foot when a user puts on shoe 10. When putting on shoe 10, the user first inserts foot F into internal space S through opening 37 of shoe 10 and places the toes on inner bottom surface 38 of shoe 10. Next, the user places the heel on inclined surface 26a at the upper end of ankle accommodation section 26 and puts weight on it. At this time, the weight applied to inclined surface 26a is supported by protrusion 27 and the thick portion 25c below it, and is transmitted to sole 11.

[0039] In this way, the user's weight is firmly supported by inclined surface 26a (arrow R1), and the heel slides along inclined surface 26a, causing foot F to tend to slip forward. Meanwhile, the instep of foot F is pushed backward by tongue 22 (arrow R2), so foot F fits stably into shoe 10, with the toes sliding forward on inner bottom surface 38 of the shoe. Once foot F is in shoe 10, the heel fits into heel storage compartment 25, protrusion 27 provides support between the heel and ankle, and inclined surface 26a supports Achilles tendon AK. Because the foot becomes one with the shoe, the user can walk lightly.

[0040] When a user wishes to take off shoes 10, they step on the protrusion 39 of one shoe 10 (for example, the left shoe) with the toe or underside of the heel of the other shoe (the right shoe) and then pull their foot out of the other shoe 10. This allows for easy removal despite the presence of the protrusion 27. Alternatively, when the user has removed their foot about halfway out of one shoe 10, they can press the protrusion 39 of the other shoe 10 with the underside 15 of the first shoe while stepping on the U-shaped protrusion 27 with the heel of the original shoe, and then pull their foot out of the other shoe 10. Furthermore, by tightening or loosening the shoelaces (symbol X in FIG. 1), the shoes can be made to stay put or to be easily removed.

[0041] While the preferred embodiments of the shoe of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications are also within the scope of the present invention. For example, in the above embodiment, the shoelace X pulls the front edges 23a, 24a of the inner wall 23 and the outer wall 24 together, but hook-and-loop fasteners or snap buttons may be used to connect the tongue 22 to the inner wall 23 and the outer wall 24. Also, a cutout 29 is provided between the inner wall 23 and the outer wall 24, and the tongue 22 covers the cutout 29 from the inside. However, the inner wall 23 and the tongue 22 may be continuous, with only one side of the tongue 22 overlapping.

[0042] In the above embodiment, almost the entire heel storage compartment 25 is made of the thickened portion 25c, but it is also possible to provide a thickened portion extending vertically in one or more central locations in the left-right direction. In the above embodiment, the upper end of the ankle storage compartment 26 is positioned lower than the ankle, but it can also be set at a height that wraps around the calf like a boot. Also, in the above embodiment, the inclined surface 26a is linear in the longitudinal cross section, but it may be curved so that it is convex or concave toward the front. Also, in the above embodiment, the rear of the ankle storage compartment 26 extends upward to form a long inclined surface, but it can also be lowered by 10 to 20 mm so that it can be used as a low boot or sneaker. [Explanation of symbols]

[0043] 10. Shoes 11 Sole 11a Groove 12 Upper 12a Upper wall 13 Main unit 14 Front (sole) 15 Bottom side 16 Center (sole) 17 Rear end (sole) FL ground S space 20 Toe 21 Front wall 22 Tongue 22a Edge 23 Inner wall 23a leading edge 24 Outer wall 24a leading edge 25 Heel storage area 25a inner surface 25b External surface 25c thick part 26 Ankle storage area 26a Slope 26b External surface 26c Top of rear wall θ Tilt angle 27 Convex part X shoelaces 28 Eyelet 29 Notch K Socks (lining) N Center in the horizontal direction M inner mold C Outer mold P1 left part P2 right part P4 Sole part (for second injection molding) 32 Mold 34 Air exhaust passage 35 Pillar 36 cavities (for the second injection molding) 36a (first injection molding) cavity 37 Aperture 38 Inner bottom surface 39 Protrusion 39a Top side 40 Convex F foot R1 arrow (reaction force from inclined surface) R2 arrow (reaction force from tongue) t1 Front sole thickness t2 Thickness of the center of the sole t3 Thickness of the rear end of the sole t4 Inner and outer wall thickness

Claims

1. The shoe comprises a main body that is an integrally molded product made of a thermoplastic polymer material and that has a sole and an upper, and a lining fabric that is bonded to the inner surface of the main body; The shoe has an upper that includes a heel accommodation section and an ankle accommodation section, a convex section that is approximately U-shaped in plan view is integrally provided between the heel accommodation section and the ankle accommodation section on the inner rear surface of the upper, and the sole that is gradually thicker from the center in the front-to-rear direction to the rear end, so that the inner bottom surface of the sole is inclined at a certain angle.

2. 2. The shoe according to claim 1, wherein the heel storage section is generally U-shaped in plan view, thicker near the center in the left-right direction and gradually thinner toward both sides, and curves continuously to wrap around the user's heel, and the rear end of the sole is approximately the same thickness as the heel storage section near the center in the left-right direction.

3. 2. The shoe according to claim 1, wherein a downwardly inclined surface is provided above the convex portion on the inner surface of the rear portion of the upper.

4. 4. The shoe according to claim 3, wherein the upper end of the ankle accommodation portion reaches the vicinity of the Achilles tendon.

5. 2. The shoe according to claim 1, wherein an upper portion of the rear wall of the ankle accommodation portion is elastically deformable so as to tilt rearward when subjected to a load.

6. 2. The shoe according to claim 1, wherein a convex surface of a constant width extending in the vertical direction is provided at the center of the left and right sides of the outer surfaces of the heel receiving portion and the ankle receiving portion.

7. 2. The shoe according to claim 1, wherein a protrusion is provided on the outer surface of the rear part of the inner wall of the sole or upper, and the upper surface of the protrusion is a flat surface on which another shoe can be hooked.

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