Easily-worn shoe with elastic heel
By incorporating a heel spring and sole unit into the shoe design, the shoe opening is automatically opened and the heel of the upper is springed back, solving the problems of inconvenience in wearing shoes and heel collapse in existing shoes, thus improving the convenience and durability of wearing shoes.
Patent Information
- Application Number
- CN202420647694.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-01
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-04-01
AI Technical Summary
Existing shoes lack elasticity in the heel, causing users to need to use their fingers or a shoehorn to put them on, and long-term direct stepping can lead to heel collapse and deformation.
Design an easy-to-wear shoe with heel elasticity, including a sole unit, an upper unit, an inner sleeve unit, a heel spring, and an adhesive layer. The heel spring consists of a spring body and a rebound wing. It automatically opens the shoe opening by elastic deformation and works with the side wall at the heel of the sole unit to achieve an automatic rebound design at the heel of the upper.
It automatically puts on shoes without the need for fingers or a shoehorn, preventing the heel of the shoe from collapsing and deforming, thus improving the convenience and comfort of putting on shoes.
Smart Images
Figure CN222303219U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a pair of shoes, in particular to an easy-to-wear pair of shoes with elastic heels. Background Art
[0002] like Figure 1 , 2 As shown in Figures 3 and 4, there is a conventional shoe comprising an upper 1, an inner sleeve 2 arranged inside the upper 1, a sole 3 fixed to the bottom of the upper 1, and a heel support 4 arranged between the heel of the upper 1 and the heel of the inner sleeve 2, wherein the heel support 4 can support and shape the heel of the upper 1.
[0003] like Figure 3 , 4 As shown in FIG. 5 , since the heel support 4 is not elastic, when inserting the heel into the inner sleeve 2, the user generally needs to pull the heel of the upper 1 back with fingers, or use a shoe horn (not shown) to help the heel slide into the inner sleeve 2, so that the heel of the upper 1 will not collapse. However, all these will cause inconvenience to the user when wearing shoes. However, when the user is too lazy to pull the heel of the upper 1 back with fingers, or there is no shoe horn available, the user will often directly step on the heel of the upper 1. This way of wearing shoes will often cause the heel of the upper 1 and the heel support 4 to collapse and deform over a long period of time. Utility Model Content
[0004] Therefore, an object of the present invention is to provide an easy-to-wear shoe with heel elasticity that can overcome at least one disadvantage of the prior art.
[0005] Therefore, the easy-to-wear shoe with heel elasticity of the utility model comprises a sole unit, an upper unit, an inner sleeve unit, a heel elastic sheet, and a bonding layer.
[0006] The sole unit includes a heel side wall.
[0007] The upper unit is arranged on the sole unit and defines an inner space with a shoe entrance. The upper unit has a top opening edge surrounding the shoe entrance and an upper heel portion abutting against the side wall at the heel.
[0008] The inner sleeve unit is arranged in the internal space, and the inner sleeve unit defines a wearing space with an open top and a closed bottom. The wearing space is connected to the shoe entrance, and the inner sleeve unit includes an inner sleeve heel portion corresponding to the heel portion of the upper.
[0009] The heel spring sheet can be elastically deformed and is arranged between the heel portion of the upper and the heel portion of the inner sleeve. The heel spring sheet includes a spring sheet body, which has a pressure-bearing portion and two rebound wings respectively extending from both sides of the pressure-bearing portion. The pressure-bearing portion has a pressure-bearing top edge adjacent to the top opening edge and a pressure-bearing bottom edge adjacent to the sole unit. The pressure-bearing bottom edge is lower than the top edge of the side wall at the heel in the height direction.
[0010] The bonding layer is fixed between the inner surface of the upper unit and the outer surface of the inner cover unit.
[0011] The utility model is an easy-to-wear shoe with heel elasticity. The upper unit also has a center line parallel to the length direction. The pressure-bearing part of the spring sheet body intersects with a vertical reference plane passing through the center line to define a rear contour of the spring sheet. The rear contour of the spring sheet is a straight line inclined upward and forward. The hardness of the spring sheet body is between 90HA and 98HA on the Shore A scale.
[0012] The utility model provides an easy-to-wear shoe with elastic heel, wherein the heel portion of the upper intersects with the vertical reference plane to define a heel outer contour, the heel outer contour is a straight line inclined upward and forward, and the heel outer contour corresponds to the rear contour of the spring sheet.
[0013] The utility model is an easy-to-wear shoe with elastic heel, the top opening edge has a highest edge section located above the compressed top edge of the compressed part in the height direction, and two concave arc edge sections extending forward from two opposite ends of the highest edge section, each concave arc edge section has a lowest point, and a rear arc edge section connected between the lowest point and the highest edge section, a first horizontal reference line parallel to the length direction can be defined through the lowest point, a first tangent line tangent to the rear arc edge section and the first horizontal reference line can define a first minimum inclination angle, and the first minimum inclination angle is not greater than 30°.
[0014] The utility model is an easy-to-wear shoe with elastic heel. Each rebound wing of the heel spring sheet has an upper arc edge connected to the compressed top edge of the compressed part, a lower arc edge connected to the compressed bottom edge of the compressed part, and a side connecting edge connected between the upper arc edge and the lower arc edge. A second horizontal reference line parallel to the length direction can be defined by the connection between the upper arc edge and the side connecting edge. A second minimum inclination angle can be defined between a second tangent line tangent to the upper arc edge and the second horizontal reference line. The second minimum inclination angle is not greater than 30°, and the first minimum inclination angle corresponds to the second minimum inclination angle.
[0015] The utility model provides an easy-to-wear shoe with heel elasticity, and further comprises a barrier unit, wherein the heel spring sheet further comprises a hot melt adhesive layer arranged on the inner surface of the spring sheet body, and the barrier unit is blocked between the inner sleeve heel portion of the inner sleeve unit and the heel spring sheet, and the hot melt adhesive layer of the heel spring sheet adheres to the barrier unit.
[0016] The utility model discloses an easy-to-wear shoe with elastic heel, wherein the inner sleeve unit also includes a top connecting end portion in a ring shape, and the barrier unit includes an isolation foam sheet arranged at the heel portion of the inner sleeve and partially covering the top connecting end portion, and an isolation heel sheet arranged at the heel portion of the inner sleeve and located below the isolation foam sheet.
[0017] The utility model provides an easy-to-wear shoe with heel elasticity, and further comprises a heel cushioning foam sheet, wherein the heel cushioning foam sheet is arranged between the barrier unit and the upper heel portion of the upper unit.
[0018] The utility model discloses an easy-to-wear shoe with elastic heel, the upper unit comprising a main upper and a shoe tongue arranged at the instep of the main upper, the main upper comprising an upper body, a shoe opening lining sewn to the upper body, and a shoe opening lining arranged between the upper body and the shoe opening lining, the upper body comprising the upper heel portion and the center line, the shoe opening lining comprising the top opening edge and a shoe opening lining bottom end portion extending downward into the wearing space, the shoe tongue comprising a tongue block and a shoe tongue lining sewn to the tongue block, the shoe tongue lining comprising a shoe tongue lining bottom end portion extending downward into the wearing space, the inner sleeve unit further comprising a ring-shaped top connecting end portion, the shoe opening lining bottom end portion is folded outwardly and sewn together with the top connecting end portion, and the shoe tongue lining bottom end portion is folded outwardly and sewn together with the top connecting end portion.
[0019] The utility model discloses an easy-to-wear shoe with elastic heel. The inner cover unit is made by sewing inner cover cut pieces. The inner cover cut pieces have a lining layer, a surface layer, and a support layer arranged between the lining layer and the surface layer.
[0020] The beneficial effect of the utility model is that the utility model utilizes the heel spring sheet in conjunction with the design of the side wall at the heel of the sole unit, so that the user can automatically bounce the heel portion of the upper unit back to its normal state by utilizing the elastic restoring force of the heel spring sheet during the process of putting on shoes without using fingers or shoe horns for assistance and without bending over, thereby easily completing the task of putting on shoes. In this way, not only can the user be more convenient and save trouble when putting on shoes, but the heel portion of the upper unit can also be effectively prevented from collapsing or deforming due to the user's stepping on it. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1It is a three-dimensional appearance diagram of an existing shoe;
[0022] Figure 2 is an exploded perspective view of the shoe;
[0023] Figure 3 is a side view of the shoe;
[0024] Figure 4 is similar to Figure 3 , indicating that the heel of the shoe is deformed by being stepped on;
[0025] Figure 5 yes Figure 4 a top view of;
[0026] Figure 6 It is a three-dimensional appearance diagram of an embodiment of the easy-to-wear shoe with heel elasticity of the utility model;
[0027] Figure 7 is similar to Figure 6 's view, but from another angle;
[0028] Figure 8 is an exploded perspective view of the embodiment;
[0029] Fig. 9 is a side view of the embodiment;
[0030] Fig.10 is a rear view of the embodiment;
[0031] Fig.11 is an unfolded plan view of a heel spring sheet of the embodiment before assembly;
[0032] Fig.12 is a three-dimensional diagram of the heel spring in an assembled state;
[0033] Fig.13 is a combined cross-sectional view of the embodiment;
[0034] Fig.14 yes Fig.13 An enlarged cross-sectional view of the middle A area;
[0035] Fig.15 yes Fig.13 An enlarged cross-sectional view of the middle B area;
[0036] Fig.16 is similar to Fig. 9 , illustrating a heel portion of an upper of an upper unit of the embodiment being stepped on;
[0037] Fig.17It is a top view, illustrating that when the heel portion of the upper unit is stepped on, the heel spring sheet opens a shoe entrance of the upper unit. DETAILED DESCRIPTION
[0038] The utility model is described in detail below with reference to the accompanying drawings and embodiments.
[0039] See also Figure 6 , 7 8 is an embodiment of the easy-to-wear shoe 100 with heel elasticity of the utility model, and the easy-to-wear shoe 100 comprises a sole unit 10, a vamp unit 20, an inner sleeve unit 30, a heel spring sheet 40, a barrier unit 50, a heel cushioning foam sheet 60, and a bonding layer 70 (see Fig.13 ).
[0040] The sole unit 10 includes a heel side wall 11 , a toe side wall 12 , and two side side walls 13 connected between the heel side wall 11 and the toe side wall 12 .
[0041] like Figure 8 , 9 As shown in FIG. 10 , the upper unit 20 is disposed on the sole unit 10 and includes a main upper 21 and a tongue 22 disposed at the instep of the main upper 21. The main upper 21 has a main upper body 23, a shoe opening lining 24 sewn to the main upper body 23, and a shoe opening lining 25 disposed between the main upper body 23 and the shoe opening lining 24 (see FIG. Fig.14 The shoe tongue 22 has a shoe tongue block 26 and a shoe tongue lining 27 sewn to the shoe tongue block 26. The shoe upper unit 20 defines an inner space 28 having a shoe entrance 281 formed therein.
[0042] The upper body 23 has a heel portion 231 abutting against the side wall 11 at the heel, and a center line 232 parallel to a length direction X. The heel portion 231 intersects with a vertical reference plane 200 passing through the center line 232 to define a heel outer contour 233 (see FIG. Fig.14 ), the heel outer contour 233 (see Fig.14 ) is a straight line sloping upward and forward.
[0043] The shoe opening lining 24 has a top opening edge 241 surrounding the shoe opening 281, and a shoe opening lining bottom end portion 242 extending downward (see FIG. Fig.13 , 14 ).
[0044] The top opening edge 241 has a highest edge segment 243 and two concave arc edge segments 244 extending forward from opposite ends of the highest edge segment 243. Each concave arc edge segment 244 has a lowest point 245 and a rear arc edge portion 246 connected between the lowest point 245 and the highest edge segment 243. A first horizontal reference line L1 parallel to the length direction X can be defined through the lowest point 245. A first tangent line T1 tangent to the rear arc edge portion 246 and the first horizontal reference line L1 can define a first minimum inclination angle θ1, and the first minimum inclination angle θ1 is not greater than 30°.
[0045] The shoe tongue lining 27 has a shoe tongue lining bottom end 271 extending downward (see FIG. Fig.13 ).
[0046] like Figure 8 , 13 As shown in Figures 14, the inner sleeve unit 30 is disposed in the inner space 28. The inner sleeve unit 30 includes a ring-shaped top connecting end 31 and an inner sleeve heel portion 32 corresponding to the upper heel portion 231. The inner sleeve unit 30 defines a wearing space 34 with an open top and a closed bottom, and the wearing space 34 is connected to the shoe inlet 281.
[0047] In this embodiment, the inner sleeve unit 30 is made by sewing an inner sleeve cut piece 33. Fig.15 As shown, the inner cover panel 33 has a lining layer 331 , a surface layer 332 , and a support layer 333 disposed between the lining layer 331 and the surface layer 332 .
[0048] In this embodiment, the support layer 333 is an upright pile layer woven between the lining layer 331 and the surface layer 332 . However, the present invention is not limited thereto. In other variations, the support layer 333 may also be a foam layer.
[0049] In this embodiment, the shoe opening lining bottom end 242 of the shoe opening lining 24 extends downward into the wearing space 34, and the shoe opening lining bottom end 271 of the shoe tongue lining 27 extends downward into the wearing space 34. The shoe opening lining bottom end 242 is folded outward and sewn together with the top connecting end 31, and the shoe tongue lining bottom end 271 is folded outward and sewn together with the top connecting end 31. The shoe opening lining bottom end 242 of the shoe opening lining 24 is continuous with the shoe tongue lining bottom end 271 of the shoe tongue lining 27, thereby surroundingly covering the top connecting end 31 of the inner sleeve unit 30.
[0050] like Fig. 9 , 10 As shown, the heel spring piece 40 can be elastically deformed and is disposed on the heel portion 231 of the upper (see Fig.14) and the inner sleeve heel portion 32 (see Fig.14 )between.
[0051] like Fig.11 , 12 As shown in FIG. 14 , the heel spring piece 40 includes a spring piece body 41 and a hot melt adhesive layer 42 disposed on the inner surface of the spring piece body 41 .
[0052] The spring body 41 has a pressure-bearing portion 43 and two rebound wings 44 extending from both sides of the pressure-bearing portion 43, respectively. The pressure-bearing portion 43 has a pressure-bearing top edge 431 adjacent to the top opening edge 241 and a pressure-bearing bottom edge 432 adjacent to the sole unit 10. The pressure-bearing bottom edge 432 is lower than the top edge of the heel side wall 11 in the height direction Z. The hardness of the spring body 41 is between 90HA and 98HA in Shore hardness. In this embodiment, the highest edge section 243 of the top opening edge 241 is located above the pressure-bearing top edge 431 of the pressure-bearing portion 43 in the height direction Z. The pressure-bearing top edge 431 is upward until it is adjacent to the highest edge section 243 of the top opening edge 241. The material of the spring body 41 is TPU, which is a known material in the prior art. The thickness of the spring body 41 is 1.5 mm.
[0053] The pressure receiving portion 43 of the spring body 41 is aligned with the vertical reference plane 200 (see Fig.10 ) can define a spring piece rear contour 433, and the spring piece rear contour 433 is a straight line inclined upward and forward, and the rear heel outer contour 233 corresponds to the spring piece rear contour 433.
[0054] like Fig. 9 , 11 As shown in Figures 12, each rebound wing 44 of the heel spring piece 40 has an upper arc edge 441 connected to the compressed top edge 431 of the compressed portion 43, a lower arc edge 442 connected to the compressed bottom edge 432 of the compressed portion 43, and a side connecting edge 443 connected between the upper arc edge 441 and the lower arc edge 442. A second horizontal reference line L2 parallel to the length direction X can be defined through the connection between the upper arc edge 441 and the side connecting edge 443, and a second tangent line T2 tangent to the upper arc edge 441 and the second horizontal reference line L2 can define a second minimum inclination angle θ2, and the second minimum inclination angle θ2 is not greater than 30°, and the first minimum inclination angle θ1 corresponds to the second minimum inclination angle θ2.
[0055] It is understandable that if Fig. 9 , 10As shown in Figures 14, the heel spring piece 40 can support the upper heel portion 231 of the upper body 23 and the inner sleeve heel portion 32 of the inner sleeve unit 30, and support the highest edge segment 243 of the top opening edge 241 of the shoe mouth lining 24 and the rear arc edge segment 246 of the concave arc edge segment 244, so that the heel outer contour 233 can correspond to the spring piece rear contour 433, and the first minimum inclination angle θ1 can correspond to the second minimum inclination angle θ2.
[0056] like Figure 8 , 13 As shown in FIGS. 14 and 15 , the barrier unit 50 is blocked between the inner sleeve heel portion 32 of the inner sleeve unit 30 and the heel elastic sheet 40 , and the hot melt adhesive layer 42 of the heel elastic sheet 40 is adhered to the barrier unit 50 .
[0057] In this embodiment, the barrier unit 50 includes an isolation foam sheet 51 disposed on the inner sleeve heel portion 32 and partially shielding the top connecting end portion 31, and an isolation heel sheet 52 disposed on the inner sleeve heel portion 32 and located below the isolation foam sheet 51. The isolation foam sheet 51 is bent to cover the local top connecting end portion 31 and extends into the wearing space 34. The isolation heel sheet 52 is made of TPU, which is a known material in the prior art. The thickness of the isolation heel sheet 52 is 0.8-1 mm. It can be understood that the isolation foam sheet 51 and the isolation heel sheet 52 can prevent the hot melt adhesive layer 42 of the heel spring sheet 40 from directly adhering to the surface fabric layer 332 of the inner sleeve cut piece 33 of the inner sleeve unit 30, and the isolation foam sheet 51 can also prevent the hot melt adhesive layer 42 of the heel spring sheet 40 from overflowing into the inner sleeve unit 30.
[0058] The heel cushioning foam sheet 60 is disposed between the barrier unit 50 and the upper heel portion 231 of the upper unit 20 .
[0059] like Fig.13 , 14 As shown in FIGS. 15 and 15 , the bonding layer 70 is fixed between the inner surface of the upper unit 20 and the outer surface of the inner cover unit 30 .
[0060] By this, Fig.13 , 16As shown in Figures 17, when the user wants to put on the shoe, the front half of the foot can be inserted into the wearing space 34 of the inner sleeve unit 30, and the heel can be directly used to step on the upper heel portion 231 of the upper body 23 of the upper unit 20. In this process, the pressure-bearing portion 43 of the spring sheet body 41 of the heel spring sheet 40 will be bent downward under the condition of supporting the side wall 11 at the heel of the sole unit 10, and the rebound wing portion 44 of the spring sheet body 41 will open the shoe entrance 281 of the internal space 28 of the upper unit 20 in a horizontal direction Y, so as to facilitate the user to insert the heel into the wearing space 34 of the inner sleeve unit 30. After the user slightly raises the heel, the elastic restoring force of the spring sheet body 41 will automatically rebound the upper heel portion 231 of the upper body 23 of the upper unit 20 to Fig. 9 The state shown allows the user to easily put on shoes without the assistance of fingers or shoe horns and without bending over.
[0061] Through the above description, the advantages of the utility model can be summarized as follows:
[0062] 1. The utility model utilizes the heel spring piece 40 in conjunction with the design of the side wall 11 at the heel of the sole unit 10, so that the user can automatically rebound the upper heel portion 231 of the upper body 23 of the upper unit 20 to a normal state by utilizing the elastic restoring force of the heel spring piece 40 when putting on shoes, without using fingers or shoe horns for assistance and without bending over, so as to easily complete the shoe-putting operation. Compared with the prior art, the utility model not only allows the user to put on shoes more conveniently and saves trouble, but also effectively prevents the upper heel portion 231 of the upper body 23 of the upper unit 20 from collapsing or deforming due to the user's stepping.
[0063] Second, the utility model utilizes the barrier unit 50 in conjunction with the design of the heel spring sheet 40 to prevent the hot melt adhesive layer 42 of the heel spring sheet 40 from directly adhering to the surface fabric layer 332 of the inner sleeve cut piece 33 of the inner sleeve unit 30, so as to effectively prevent the surface fabric layer 332 of the inner sleeve cut piece 33 of the inner sleeve unit 30 from being torn during the elastic deformation of the heel spring sheet 40. In addition, the isolation foam sheet 51 of the barrier unit 50 can effectively prevent the adhesive of the hot melt adhesive layer 42 of the heel spring sheet 40 from overflowing into the inner sleeve unit 30 during the bonding process.
[0064] 3. The utility model utilizes the heel cushioning foam sheet 60 in conjunction with the design of the heel spring sheet 40. When the user uses the heel to step on the upper heel portion 231 of the upper body 23 of the upper unit 20, it can not only produce a cushioning effect, but also prevent the user's heel from hitting the relatively hard heel spring sheet 40, allowing the user to have a better shoe wearing experience.
[0065] Fourth, the present invention utilizes the design that the bottom end 242 of the shoe opening lining 24 is folded outwards and then sewn together with the top connecting end 31 of the inner sleeve unit 30, and the bottom end 271 of the shoe tongue lining 27 is folded outwards and then sewn together with the top connecting end 31 of the inner sleeve unit 30. In addition to hiding the sewing lines between the shoe opening lining 24 and the inner sleeve unit 30 and the sewing lines between the shoe tongue lining 27 and the inner sleeve unit 30, the internal sewing marks of the present invention are simplified, the texture is increased, and the wearing comfort of the user is improved.
[0066] In summary, the easy-to-wear shoes with elastic heels of the present invention not only allow users to easily put on shoes without using fingers or shoe horns for assistance and without bending over, but also prevent the heel portion of the upper body of the upper unit from collapsing or deforming due to being stepped on, so the purpose of the present invention can indeed be achieved.
[0067] The above description is only an embodiment of the present utility model, and should not be used to limit the scope of the present utility model. That is, all simple equivalent changes and modifications made according to the claims and the description of the present utility model are still within the scope of the present utility model.
Claims
1. An easy-to-wear shoe with elastic heel, comprising a sole unit, an upper unit, an inner sleeve unit, and a bonding layer, characterized in that: The easy-to-wear shoe with heel elasticity also includes a heel elastic sheet; The sole unit includes a side wall at the heel; The upper unit is arranged on the sole unit and defines an internal space with a shoe entrance. The upper unit has a top opening edge surrounding the shoe entrance and a shoe upper heel portion abutting against the side wall at the heel. The inner sleeve unit is arranged in the inner space, the inner sleeve unit defines a wearing space with an open top and a closed bottom, the wearing space is connected to the shoe entrance, and the inner sleeve unit includes an inner sleeve heel portion corresponding to the heel portion of the upper; The heel spring sheet is elastically deformable and is disposed between the upper heel portion and the inner sleeve heel portion. The heel spring sheet comprises a spring sheet body, wherein the spring sheet body comprises a pressure-bearing portion and two rebound wings extending from both sides of the pressure-bearing portion, respectively. The pressure-bearing portion comprises a pressure-bearing top edge adjacent to the top opening edge and a pressure-bearing bottom edge adjacent to the sole unit, wherein the pressure-bearing bottom edge is lower than the top edge of the side wall at the heel in the height direction; and The bonding layer is fixed between the inner surface of the upper unit and the outer surface of the inner cover unit.
2. The easy-to-wear shoe with elastic heel according to claim 1, characterized in that: The upper unit also has a center line parallel to the length direction. The pressure-bearing portion of the spring body intersects with a vertical reference plane passing through the center line to define a rear contour of the spring. The rear contour of the spring is a straight line inclined upward and forward. The hardness of the spring body is between 90HA and 98HA on the Shore A scale.
3. The easy-to-wear shoe with elastic heel according to claim 2, characterized in that: The intersection of the heel portion of the upper and the vertical reference plane can define a heel outer contour, and the heel outer contour is a straight line inclined upward and forward, and the heel outer contour corresponds to the rear contour of the spring.
4. The easy-to-wear shoe with elastic heel according to claim 2, characterized in that: The top opening edge has a highest edge segment located above the compressed top edge of the compressed portion in the height direction, and two concave arc edge segments extending forward from opposite ends of the highest edge segment, each concave arc edge segment has a lowest point, and a rear arc edge portion connected between the lowest point and the highest edge segment, a first horizontal reference line parallel to the length direction can be defined through the lowest point, a first tangent line tangent to the rear arc edge portion and the first horizontal reference line can define a first minimum inclination angle, and the first minimum inclination angle is not greater than 30°.
5. The easy-to-wear shoe with elastic heel according to claim 4, characterized in that: Each rebound wing of the heel spring sheet has an upper arc edge connected to the compressed top edge of the compressed portion, a lower arc edge connected to the compressed bottom edge of the compressed portion, and a side connecting edge connected between the upper arc edge and the lower arc edge. A second horizontal reference line parallel to the length direction can be defined through the connection between the upper arc edge and the side connecting edge, and a second minimum inclination angle can be defined between a second tangent line tangent to the upper arc edge and the second horizontal reference line. The second minimum inclination angle is not greater than 30°, and the first minimum inclination angle corresponds to the second minimum inclination angle.
6. The easy-to-wear shoe with elastic heel according to claim 1, characterized in that: The easy-to-wear shoe with heel elasticity also includes a barrier unit, and the heel spring sheet also includes a hot-melt adhesive layer arranged on the inner surface of the spring sheet body. The barrier unit blocks the inner sleeve heel portion of the inner sleeve unit and the heel spring sheet, and the hot-melt adhesive layer of the heel spring sheet adheres to the barrier unit.
7. The easy-to-wear shoe with elastic heel according to claim 6, characterized in that: The inner sleeve unit also includes a ring-shaped top connecting end, and the barrier unit includes an isolation foam sheet arranged at the heel portion of the inner sleeve and partially covering the top connecting end, and an isolation heel sheet arranged at the heel portion of the inner sleeve and located below the isolation foam sheet.
8. The easy-to-wear shoe with elastic heel according to claim 7, characterized in that: The easy-to-wear shoe with heel elasticity further comprises a heel cushioning foam sheet, and the heel cushioning foam sheet is arranged between the barrier unit and the upper heel portion of the upper unit.
9. The easy-to-wear shoe with elastic heel according to claim 2, characterized in that: The upper unit includes a main upper and a tongue arranged at the instep of the main upper, the main upper having an upper body, a shoe opening lining sewn to the upper body, and a shoe opening pad arranged between the upper body and the shoe opening lining, the upper body having the upper heel portion and the center line, the shoe opening lining having the top opening edge and a shoe opening lining bottom end extending downward into the wearing space, the tongue having a tongue block and a tongue lining sewn to the tongue block, the tongue lining having a tongue lining bottom end extending downward into the wearing space, the inner sleeve unit also includes a ring-shaped top connecting end, the shoe opening lining bottom end folded outward and sewn together with the top connecting end, and the tongue lining bottom end folded outward and sewn together with the top connecting end.
10. The easy-to-wear shoe with elastic heel according to claim 9, characterized in that: The inner cover unit is made by sewing an inner cover piece, and the inner cover piece comprises a lining layer, a surface layer, and a support layer arranged between the lining layer and the surface layer.