Heel structure of short shoe

Abstract

To provide a heel structure capable of comparably keeping an elastic restoration force of a structure itself of a heel lower part even if a heel is deformed by repeatedly application of a body weight and repeatedly self-restoring the structure into an original shape.SOLUTION: A heel structure of a short shoe includes: a combination core material constituted by vertically combining an upper core material 1 formed of a molded body made of an elastic resin having a predetermined rigidity and a lower core material 2 formed of a plate-shaped body made of an elastic resin having a smaller rigidity than the predetermined rigidity of the upper core material, and forming a three-dimensional shape having a heel wall which is inclined in a predetermined inclination direction excluding a vertical direction and curved into a partially cylindrical shape or partially conical shape; an upper stay 1HL including a cushion material surrounding a front part, an upper part, and a rear part of the upper core material 1; a counter heel 3 entirely covering the upper stay 1HL and the combination core material with a covering material and covered, on an outer side, with a three-dimensional reinforcement part three-dimensionally covering an area from a heel rear part to both side parts; and a sole plate M including a wearing bottom face including a bottom face of a heel part of a footprint and a peripheral side part thereof and constituting an entire sole.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a heel structure for low shoes. Examples of shoes with this heel structure include low shoes with flat soles, such as work shoes such as safety shoes, slip-on shoes, and jogging shoes. [Background technology]

[0002] Conventionally, as footwear having a doffing ledge, footwear having a collar elevator (e.g., collar elevators 350 and 450) is disclosed that can be worn by a wearer without using his / her hands to operate the footwear. For example, the footwear described in Patent Document 1 (JP Patent Publication 2022-514060) includes a collar elevator operable to return an ankle collar from the lowered state to the upright state, the collar elevator having an inner lever arm, an outer lever arm, and a central connecting band that connects the inner lever arm to the outer lever arm and is located near a rear portion of the ankle collar; The portion 325 or 425 of the upper below the central connecting band includes one or more fabric walls that are more flexible than other portions of the upper, and the more flexible area of ​​the upper can be, for example, at least partially in the heel counter area. In particular, it is believed that such a more flexible portion 325 or 425 of the upper may fold more easily as the ankle collar moves to a lowered state and may provide less resistance to the collar elevator as it returns to a less compressed state.

[0003] Also, for example, the wearer's toes may be inserted through the foot insertion opening 318 or 418 while the arch or heel of one's foot is used to press the ankle collar 336 or 436 downward toward the sole 312 or 412. In this manner, the size of the foot insertion opening 318 or 418 may be increased by adjusting the ankle collar 336 or 436 closer to the sole in a lowered state. As the wearer's foot slides into the foot-receiving cavity 316 or 416, the collar elevator 350 or 450 is said to move the ankle collar from a lowered state (i.e., FIGS. 3C and 4C) to an upright state (i.e., FIGS. 3A and 4A) to secure the footwear article to the wearer's foot.

[0004] [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2022-515824 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0006] However, when the conventional footwear is deformed by repeatedly applying weight to the heel, the elastic restoring force of the outcounter itself, which is a structure under the heel, weakens, or it breaks, collapses, or plastically deforms, becoming unable to independently return to its original shape. In addition, the adhesive joint is repeatedly deformed and subjected to external tensile forces, which causes problems such as a lack of durability and susceptibility to breakage.

[0007] Therefore, the present invention aims to provide a heel structure that can relatively maintain the elastic restoring force of the heel lower structure itself even if it is deformed by repeated weight application on the heel, and can repeatedly return to its original shape by itself. Another aim of the present invention is to provide a heel structure that can maintain its durability and is less likely to break even if it is repeatedly deformed. [Means for solving the problem]

[0008] In order to solve the above problems, the following solutions have been taken.

[0009] [1] The heel structure of the low shoe of the present invention is as follows: a combined core material having a three-dimensional shape with a heel wall that is curved in a partial cylindrical or partial conical shape in a predetermined inclination direction except for the vertical direction, the combined core material being constructed by vertically combining an upper core material 1 made of an elastic resin molded body having a predetermined rigidity (elastic modulus) and a lower core material 2 made of an elastic resin plate-like body having a rigidity smaller than the predetermined rigidity of the upper core material; an upper stay 1HL having a cushion material surrounding the front, upper, and rear parts of the upper core member 1; a counter heel 3 formed by covering the upper stay 1HL and the combined core material entirely with a covering material and externally covering a three-dimensional reinforcing part that three-dimensionally covers the heel rear part to both sides; A heel structure for a low shoe, comprising a sole plate MS having a bottom surface of a heel part of a foot shape and a bottom surface including a peripheral part thereof, and constituting the entire sole, The lower core material 2 is The lower side of the upper core 1 is connected along the upper side of the widthwise center of the elastic plate having a mountain-like shape with the widthwise center protruding when viewed from a developed surface of the plate-like body, to form a combined core. The combination core material is The lower edge of the mountain-shaped shape of the lower core material 2 is curved along the surface shape of the bottom surface of the sole plate MS, and at least the left and right ground contact portions 22 of the mountain-shaped lower edge of the lower core material 2 are placed and fixed on the bottom surface along the peripheral side portion of the bottom surface of the sole plate MS, and are contained inside the covering material of the counter heel 3.

[0010] The combined core material constructed in this way is made up of a connected structure of upper core material 1, which is relatively difficult to deform and receives most of the external force, and lower core material 2, which is easily elastically deformed by the three-dimensional curved material of an elastic plate, so it is resistant to damage no matter how many times it is stepped on. In other words, with the above structure, the combined core material can maintain a predetermined curved three-dimensional shape (made of partial cones) in an open state where no external force is applied.

[0011] (2) The molded body of the upper core material 1 is The spatula-shaped three-dimensional molded body has a spatula-shaped concave surface 1H on the upper surface, the central portion of which is curved concavely with respect to both side portions. A connecting portion 1E having an inverted concave shape is formed along the outer surface of the lower side of this three-dimensional molded body, In addition, the plate-shaped body of the lower core material 2 is A step portion 21D corresponding to the connecting portion 1E is formed in a step-like or notched shape in a side cross-sectional view on an inner surface of a protruding portion in the width direction center of the mountain-shaped shape when unfolded, The connecting portion 1E of the upper core material 1 is sewn and / or bonded along the step portion 21D of the lower core material 2, The normals of the spatula concave surface 1H of the upper core material 1 are all directed obliquely upward, and The upper stay 1HL covering the upper core 1 constitutes the rear part of the heel part of the shoe opening and is formed to extend obliquely upward further behind the rear part and project.

[0012] With this structure of the upper stay 1HL having the upper core material 1 inside, in a crushed state when stepped on by the heel of the user, the elastic plate at least above the left and right ground contact portions 22 of the plate-shaped core material 2 elastically deforms, and the elastic restoring force at this time generates a force that encourages the spatula-shaped concave surface of the upper core material 1 to orient diagonally upward and guide the heel of the user to slide into the inside of the shoe. Then, in the released state after elastically returning from the crushed state, the elastic restoring force of the combined core material causes the upper stay 1H to extend diagonally upward and independently return to a state inclined from the vertical direction covering the upper part of the heel of the user.

[0013] (3) In the heel structure of the low shoe, The plate-like body of the lower core material 2 has left and right ground contact portions 22 of the lower side of the mountain shape in the developed surface view in the developed state, which are symmetrically inclined sides inclined obliquely upward toward the outer side, and At least a part of a width direction section of a width direction center part of the lower side of the mountain shape sandwiched between the left and right grounding parts 22 forms a notch shape part 22D when viewed from the development surface in the developed state, When the combined core material is curved and deformed into a three-dimensional shape, the cutout portion 22D is spaced upward from the bottom surface of the sole plate MS and is in a hollow state.

[0014] By making the central portion a non-fixed portion, it becomes a region that collapses during deformation, and it is possible to reduce the occurrence of external tensile forces on the left and right fixed portions that are embedded and fixed.

[0015] (4) In the heel structure of any one of the above-described low shoes, The lower deformable core material 2 is a plate-like body in which lattice window rows 231, 232 are formed in two or more rows, one above the other, and the rows are curved in the width direction and extend to the left and right ends within the surface of the deployed panel in the deployed state. A feature of the present invention is that left and right grounding portions 22 are formed at the left and right extensions of the left and right ends of at least the topmost lattice window row.

[0016] With this configuration, when the frame is collapsed, the multiple rows of lattice windows act as deformation allowances and elastically deform. Because the lattice windows are arranged in multiple fan-shaped rows and the plate-shaped parts have obliquely inclined side faces and are fixed at an angle, it is easy to form an elastic return surface to the original angle.

[0017] (5) The counter heel 3 is characterized in that the outer surface of the counter heel 3 has a curved or inverted V-shaped bending line 231BL, 232BL at the upper and lower edges thereof, which is formed in accordance with the row formation position of the lattice window row of the lower core material 2, and is constructed by switching the switching width lines with an extension material having a higher elongation rate than the upper and lower constituent materials. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is an enlarged perspective view showing the internal shape of the heel part of the shoe of Example 1; [Diagram 2] 2 is a plan view of the open state (a) and the deformed state (b) of FIG. 1. [Diagram 3] Enlarged perspective views of the inside of the sample showing the internal shape in the two-stage compressed state (b1) and (b2) [Figure 4] FIG. 2 is an internal structure diagram of the upper core material 1 and the lower core material 2 in an exploded state. [Diagram 5]FIG. 13 is a rear view of the internal storage state of the combined core material. [Figure 6] Side view of the low shoes in use (a)(b1)(b2)(c)

[0019] By taking the above measures, it is possible to provide a heel structure that can maintain the elastic restoring force of the heel lower structure itself even if it is deformed by repeated weight application on the heel, and can repeatedly return to its original shape by itself. It is also possible to provide a heel structure that can maintain its durability even if it is repeatedly deformed, and is less likely to break. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, embodiments of the present invention will be described with reference to FIGS.

[0021] [1] The heel structure of the low shoe of the present invention is as follows: a combined core material having a three-dimensional shape with a heel wall that is curved in a partial cylindrical or partial conical shape in a predetermined inclination direction except for the vertical direction, the combined core material being constructed by vertically combining an upper core material 1 made of an elastic resin molded body having a predetermined rigidity (elastic modulus) and a lower core material 2 made of an elastic resin plate-like body having a rigidity smaller than the predetermined rigidity of the upper core material; an upper stay 1HL having a cushion material surrounding the front, upper, and rear parts of the upper core member 1; a counter heel 3 formed by covering the upper stay 1HL and the combined core material entirely with a covering material and externally covering a three-dimensional reinforcing part that three-dimensionally covers the heel rear part to both sides; A heel structure for a low shoe, comprising a sole plate MS having a bottom surface of a heel part of a foot shape and a bottom surface including a peripheral part thereof, and constituting the entire sole, The lower core material 2 is The lower side of the upper core 1 is connected along the upper side of the widthwise center of the elastic plate having a mountain-like shape with the widthwise center protruding when viewed from a developed surface of the plate-like body, to form a combined core. The combination core material is The lower edge of the mountain-shaped shape of the lower core material 2 is curved along the surface shape of the bottom surface of the sole plate MS, and at least the left and right ground contact portions 22 of the mountain-shaped lower edge of the lower core material 2 are placed and fixed on the bottom surface along the peripheral side portion of the bottom surface of the sole plate MS, and are contained inside the covering material of the counter heel 3.

[0022] The combined core material constructed in this manner is constructed with a connecting structure of an upper core material 1, which is relatively difficult to deform and receives most of the external force, and a lower core material 2, which is easily elastically deformed by a three-dimensionally curved elastic plate-like material, so that it is unlikely to be damaged no matter how many times it is stepped on.

[0023] More specifically, the core material made of elastic resin that constitutes the heel wall and its upper core portion is configured by connecting and combining an upper core material 1, which has a relatively high rigidity, and a lower core material 2, which has a relatively low rigidity, so that when the user puts on the shoe by stepping on it with their heel, the upper core material mainly plays the role of a receiver for the contact part when stepping on it, and the lower core material connected to its lower part mainly plays the role of an elastically deformable body, which elastically deforms into a shape that encourages the user's heel to fit inside the shoe.

[0024] Here, the lower core 2 is housed in the covering material of the counter heel 3 in a state in which it is elastically deformed into a three-dimensional shape by bending a plate-like body made of an elastic material, and has internal stress due to an elastic reaction force. This three-dimensional shape has a heel wall that is curved into a partial cylindrical or conical shape at an inclination in a predetermined inclination direction other than the vertical direction, and is not flat overall but is continuously curved into a partial cylindrical or conical shape. Furthermore, the lower side of the upper core material, which has greater rigidity, is connected along the upper side of the mountain-shaped plate-like body of the lower core material. As a result, even if it is elastically deformed by an external force caused by crushing, it is likely to elastically return to its original three-dimensional shape, and it is likely to maintain its original three-dimensional shape after elastic return.

[0025] That is, with the above-mentioned configuration, the combined core material can maintain a predetermined curved three-dimensional shape (consisting of partial cones) in an open state where no external force is applied.

[0026] (2) The molded body of the upper core material 1 is The spatula-shaped three-dimensional molded body has a spatula-shaped concave surface 1H on the upper surface, the central portion of which is curved concavely with respect to both side portions. A connecting portion 1E having an inverted concave shape is formed along the outer surface of the lower side of this three-dimensional molded body, In addition, the plate-shaped body of the lower core material 2 is A step portion 21D corresponding to the connecting portion 1E is formed in a step-like or notched shape in a side cross-sectional view on an inner surface of a protruding portion in the width direction center of the mountain-shaped shape when unfolded, The connecting portion 1E of the upper core material 1 is sewn and / or bonded along the step portion 21D of the lower core material 2, The normals of the spatula concave surface 1H of the upper core material 1 are all directed obliquely upward, and The upper stay 1HL covering the upper core 1 constitutes the rear part of the heel part of the shoe opening and is formed to extend obliquely upward further behind the rear part and project.

[0027] With this structure of the upper stay 1HL having the upper core material 1 inside, in a crushed state when stepped on by the heel of the user, the elastic plate at least above the left and right ground contact portions 22 of the plate-shaped core material 2 elastically deforms, and the elastic restoring force at this time generates a force that encourages the spatula-shaped concave surface of the upper core material 1 to orient diagonally upward and guide the heel of the user to slide into the inside of the shoe. Then, in the released state after elastically returning from the crushed state, the elastic restoring force of the combined core material causes the upper stay 1H to extend diagonally upward and independently return to a state inclined from the vertical direction covering the upper part of the heel of the user.

[0028] (3) In the heel structure of the low shoe, The plate-like body of the lower core material 2 has left and right ground contact portions 22 of the lower side of the mountain shape in the developed surface view in the developed state, which are symmetrically inclined sides inclined obliquely upward toward the outer side, and At least a part of a width direction section of a width direction center part of the lower side of the mountain shape sandwiched between the left and right grounding parts 22 forms a notch shape part 22D when viewed from the development surface in the developed state, When the combined core material is curved and deformed into a three-dimensional shape, the cutout portion 22D is spaced upward from the bottom surface of the sole plate MS and is in a hollow state.

[0029] When the left and right ground contacting parts 22 are in contact with the upper surface of the sole plate MS in the range of the lower side of the mountain shape except for the widthwise center part, the notch-shaped part 22D in the widthwise center is a non-ground contacting part that is not in contact with the sole plate MS and has a gap. This non-ground contacting part becomes a deformation allowance when the lower core material 2 elastically deforms, and elastically deforms into a concave shape, and elastically returns to its original state due to the internal stress of the left and right ground contacting parts 22 of the non-ground contacting part.

[0030] In other words, when the cutout 22D is open, it is curved convexly so that the central portion protrudes backward, and when it is stepped on by the user's heel, the central portion in the width direction of the lower edge of the plate-shaped core material 2, excluding the left and right ground contact portions 22, becomes the crushed area upon deformation, and the upper portion gradually elastically deforms so as to turn inside out into a concave curved state (Figure 3).

[0031] In the open state where the crushed state is released, the shoe is elastically deformed into a curved three-dimensional shape and independently returns to the three-dimensional shape due to an elastic restoring force originating from the left and right ground contact portions 22 installed and housed along the sides of the heel shape.

[0032] By making the central portion a non-fixed portion, it becomes a region that collapses during deformation, and it is possible to reduce the occurrence of external tensile forces on the left and right fixed portions that are embedded and fixed.

[0033] In the embodiment described below, the left and right ground contact portions 22 of the lower side of the mountain shape form straight diagonal lines when viewed in an unfolded plane, and are embedded and fixed in a curved shape into embedded grooves formed along the inner and outer parts of the heel shape on the upper surface of the sole plate MS.

[0034] A cutout portion 22D is formed in the center of the lower side of the mountain shape excluding the left and right ground contact portions 22. In the three-dimensional shape, the cutout portion 22D is hollow and not in contact with the sole plate.

[0035] (4) In the heel structure of any one of the above-described low shoes, The lower deformable core material 2 is a plate-like body in which lattice window rows 231, 232 are formed in two or more rows, one above the other, and the rows are curved in the width direction and extend to the left and right ends within the surface of the deployed panel in the deployed state. A feature of the present invention is that left and right grounding portions 22 are formed at the left and right extensions of the left and right ends of at least the topmost lattice window row.

[0036] In the embodiment, a total of three lattice window rows are formed in the plate-like surface, consisting of the first and second lattice window rows 231, 232, which are in the shape of a mountain-shaped "H" protruding in the center, and the horizontally elongated elliptical lattice window row 233 in the lower center, and the left and right grounding sections 22, which are made of linearly cut inclined sides, are formed at the left and right extensions of the left and right ends of the top and second lattice window rows 231, 232. The horizontally elongated elliptical third lattice window row 233 is formed in a small section in the lower center with a width less than half that of the first and second lattice window rows 231, 232, and the notch section 22D is formed in the lower part of the third lattice window row 233, in the center of the lower side of the central section of the lower side of the plate-like body.

[0037] With this configuration, when the frame is collapsed, the multiple rows of lattice windows act as deformation allowances and elastically deform. Because the lattice windows are arranged in multiple fan-shaped rows and the plate-shaped parts have obliquely inclined side faces and are fixed at an angle, it is easy to form an elastic return surface to the original angle.

[0038] The center 22D of the lower edge of the plate-like body is set as a non-adhesive section floating in the air, and both variable ends 22 of the center part of the plate-like part are embedded and fixed in the bottom plate, and the plate-like part is fixed upright on the bottom plate in an orientation having a conical side surface inclined obliquely toward the center of the bottom plate.

[0039] (5) The counter heel 3 is characterized in that the outer surface of the counter heel 3 has a curved or inverted V-shaped bending line 231BL, 232BL at the upper and lower edges thereof, which is formed in accordance with the row formation position of the lattice window row of the lower core material 2, and is constructed by switching the switching width lines with an extension material having a higher elongation rate than the upper and lower constituent materials.

[0040] The counter heel is formed by forming a switching width line made of a soft fabric having low rigidity along the folding lines 231BL, 232BL. By bending and deforming at the folding lines 231BL, 232BL, the upper and lower sides of the switching width line of the counter heel are folded and crushed.

[0041] In any one of the above-described heel structures of the low shoes, The upper spatula core material 1 is made of a concavely curved, highly rigid three-dimensional molded body that is thicker than the lower deformable core material 2, and is sewn into the notch at the top of the deformable core material with the concave curved surface of the three-dimensional molded body facing diagonally upwards (Figure 4a).

[0042] When the shoe is stepped on and deformed, the lower core material is compressed and deformed, causing the concave curved surface of the upper three-dimensional molded body to change direction and face upward from the horizontal, providing a space for the heel to step on.

[0043] In addition, the present invention is not limited to the above-described embodiment, and various modifications are possible. Combinations of elements, extraction of some elements, disassembly into parts, or integration are also possible.

Claims

1. a combined core material having a three-dimensional shape with a heel wall that is curved in a partial cylindrical or partial conical shape in a predetermined inclination direction except for the vertical direction, the combined core material being constructed by vertically combining an upper core material 1 made of an elastic resin molded body having a predetermined rigidity and a lower core material 2 made of an elastic resin plate-like body having a rigidity smaller than the predetermined rigidity of the upper core material; an upper stay 1HL having a cushion material surrounding the front, upper, and rear parts of the upper core member 1; a counter heel 3 formed by covering the upper stay 1HL and the combined core material entirely with a covering material and by covering a three-dimensional reinforcing part that three-dimensionally covers the heel from the rear part to both sides; A heel structure for a low shoe, comprising a sole plate MS having a bottom surface including a bottom surface of a heel part of a foot shape and a peripheral side part thereof, and constituting an entire sole of the shoe, The lower core material 2 is The lower side of the upper core 1 is connected along the upper side of the widthwise center of the elastic plate having a mountain-like shape with the widthwise center protruding when viewed from a developed surface of the plate-like body, to form a combined core; The combination core material is This heel structure for a low shoe is characterized in that the lower edge of the mountain-shaped lower core material 2 is curved along the surface shape of the bottom surface of the sole plate MS, and at least the left and right ground contact portions 22 of the mountain-shaped lower edge of the lower core material 2 are placed and fixed on the bottom surface along the peripheral portion of the bottom surface of the sole plate MS, and are contained inside the covering material of the counter heel 3.

2. The molded body of the upper core material 1 is The spatula-shaped three-dimensional molded body has a spatula-shaped concave surface 1H on the upper surface, the central portion of which is curved concavely with respect to both side portions. A connecting portion 1E having an inverted concave shape is formed along the outer surface of the lower side of this three-dimensional molded body, In addition, the plate-shaped body of the lower core material 2 is A step portion 21D corresponding to the connecting portion 1E is formed in a step-like or notched shape in a side cross-sectional view on an inner surface of a protruding portion in the width direction center of the mountain-shaped shape when unfolded, The connecting portion 1E of the upper core material 1 is sewn and / or bonded along the step portion 21D of the lower core material 2, The normals of the spatula concave surface 1H of the upper core material 1 are all directed obliquely upward, and 2. The heel structure of a low shoe according to claim 1, wherein the upper stay 1HL covering the upper core 1 constitutes the rear part of the heel part of the shoe opening and is formed to extend obliquely upward toward the rear of the upper stay 1HL and protrude.

3. The plate-like body of the lower core material 2 has left and right ground contact portions 22 of the lower side of the mountain shape in the developed surface view in the developed state, which are symmetrically inclined sides inclined obliquely upward toward the outer side, and At least a part of a width direction section of a width direction center portion of the lower side of the mountain shape, which is sandwiched between the left and right grounding portions 22, forms a notch shape portion 22D when viewed from the development surface in the developed state, 3. The heel structure for a low shoe according to claim 2, wherein when the combined core material is curved and deformed into a three-dimensional shape, the cutout portion 22D is in a hollow state spaced above the bottom surface of the sole plate MS.

4. The lower core material 2 is made of a plate-like body in which lattice window rows 231, 232 are formed in two or more rows, one above the other, and the rows are curved in the width direction and extend to the vicinity of the left and right ends within the surface of the development board in the development state.

2. The heel structure for low shoes according to claim 1, wherein left and right ground contact portions 22 are formed at the left and right extension ends of at least the uppermost lattice window row.

5. 5. The heel structure of a low shoe according to claim 4, characterized in that the counter heel 3 is constructed by switching the transition width lines, which are the upper and lower edges of the curved or inverted V-shaped folding lines 231BL, 232BL on the outer surface in accordance with the row formation position of the lattice window row of the lower core material 2, with an extension material having a higher elongation rate than the upper and lower constituent materials.

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