Heel core material

Abstract

To provide a heel core material capable of facilitating insertion of a foot while maintaining the quality of appearance. [Solution] The lower core material and the upper core material H2 are formed integrally and are formed in an approximately U-shape that surrounds the heel portion in a planar view, the lower core material has a horizontal bottom surface, and in a side view, the shape of the front end portion is formed in the order of a first curved shape that is convex upward, a second curved shape that is convex downward, and a third curved shape that is convex upward, starting from the bottom surface, and the shape of the rear end portion is formed in the order of a fourth curved shape that is convex backward and a fifth curved shape that is convex forward, and in a front view, the width of the lower core material is set to be greater than the width of the upper core material, and the shape of the lower core material H1 in a front view has a sixth curved shape that bulges outward to the left and right, and the horizontal cross section of the upper core material H2 is formed in an approximately U-shape that surrounds the heel portion and forms a thickness-reduced portion that gradually becomes thinner toward the end portion 51a, and this thickness-reduced portion is formed on the outer surface 51.

Description

[Technical field]

[0001] The present invention relates to a heel core that is provided in the heel portion of a footwear product to facilitate insertion of the foot. [Background technology]

[0002] When wearing footwear (such as shoes) with a heel, it is necessary to avoid crushing the heel, and it is necessary to use a shoehorn or hands when putting on footwear. However, this is troublesome because it requires bending over or sitting down.

[0003] In order to solve this problem, footwear is known in which a hard protrusion extending upward and diagonally backward is formed at the upper end of the heel (see Patent Document 1 below). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-139151 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the protruding piece protrudes upwards considerably, which may degrade the appearance quality.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a heel core material that allows easy insertion of the foot while maintaining the appearance quality. [Means for solving the problem]

[0007] In order to solve the above problems, the heel core material according to the present invention is: A heel core provided in a heel portion of a footwear product to facilitate insertion of a foot, The lower core and the upper core are integrally formed. It is formed in a roughly U-shape that surrounds the heel when viewed from above. The lower part of the core material has a horizontal bottom surface, When viewed from the side, the shape of the front end portion is formed in the following order, starting from the bottom surface portion: a first curved shape that is convex upward, a second curved shape that is convex downward, and a third curved shape that is convex upward; The shape of the rear end portion is a shape formed in the order of a fourth curved shape convex backward starting from the bottom surface portion and a fifth curved shape convex forward, When viewed from the front, the width of the lower part of the core material is set to be larger than the width of the upper part of the core material, When viewed from the front, the shape of the lower part of the core is a sixth curved shape that bulges outward on the left and right. The horizontal cross section of the upper part of the core material is formed into an approximately U-shape surrounding the heel portion, and a reduced thickness portion is formed in which the thickness gradually decreases toward the end, and this reduced thickness portion is formed on the outer surface.

[0008] The action and effect of the heel core material with such a configuration will be described. The heel core material is provided in the heel portion of the footwear product, and is formed in a substantially U-shape surrounding the heel portion in a plan view. With such a configuration, the heel core material can be provided inside the heel portion of the footwear product. The specific shape of the heel core material is such that, starting from the bottom surface, the front end portion has a first curved shape that is convex upward, a second curved shape that is convex downward, and a third curved shape that is convex upward, in this order. This allows the heel core material to sandwich the heel portion of the foot when the foot is inserted. In addition, the rear end portion has a shape that is formed from the bottom surface portion to have a fourth curved shape that is convex backward, and a fifth curved shape that is convex forward, in this order, and when the foot is inserted, the heel portion of the foot can be inserted so as to be aligned with the rear end portion. This makes it easier to insert the foot. Furthermore, this heel core can be provided within the heel of the footwear product, allowing it to have an appearance that is indistinguishable from that of an integrated footwear product, and thus maintaining the quality of its appearance.

[0009] In the present invention, it is preferable that, in a side view, each curved shape is formed so that when points on a line are traced from the bottom portion through the first curved shape, the second curved shape, and the third curved shape in that order, the points always move from front to rear.

[0010] In the present invention, it is preferable that a straight portion is formed between the fourth curved shape and the fifth curved shape. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a front perspective view of the heel core according to the embodiment; [Diagram 2] Front view of heel core [Diagram 3] Back view of heel core [Figure 4] Plan view of heel core [Diagram 5] Bottom view of heel core [Figure 6] Side view of heel core [Figure 7] Cross section AA of Figure 2 [Figure 8] Cross section B-B of Figure 2 [Figure 9] Cross section of Figure 2 [Figure 10] Schematic diagram showing heel core material built into footwear product DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A preferred embodiment of the heel core according to the present invention will be described with reference to the drawings. Fig. 1 is an external perspective view of the heel core, Fig. 2 is a front view of the heel core, Fig. 3 is a rear view of the heel core, Fig. 4 is a plan view of the heel core, Fig. 5 is a bottom view of the heel core, Fig. 6 is a side view of the heel core, Fig. 7 is a cross-sectional view taken along line AA in Fig. 2, Fig. 8 is a cross-sectional view taken along line BB in Fig. 2, and Fig. 9 is a cross-sectional view taken along line CC in Fig. 2.

[0013] FIG. 10 is a diagram showing a state in which a heel core K is built into the heel of a shoe, which is an example of a footwear product. Note that the footwear product is not limited to shoes of a specific type or design. The heel core K is a component that allows the heel to be put on without crushing it when putting on the shoes. The heel core K is made of a material having a hardness such as a hard resin, and it is not necessary to use a shoehorn or hands when putting on the shoes. In addition, it is built into the inside of the heel of the shoe, and the design of the heel is no different from that of a general shoe.

[0014] The heel core K is a single member and can be manufactured by, for example, injection molding. The heel core K is integrally formed of a lower core H1 and an upper core H2. As shown in FIG. 4, in a plan view, it is formed in a substantially U-shape that surrounds the heel of the foot. The heel is connected at the rear and is open at the front.

[0015] 6, the shape of the front end portion is such that, starting from the bottom surface portion 30, a first curved shape 10 that is convex upward, a second curved shape 11 that is convex downward, and a third curved shape 12 that is convex upward are formed continuously in this order. These curved shapes may be formed as a single circular arc shape, or may be formed as a parabola or an ellipse shape, and are not limited to a specific curved curve.

[0016] As shown by the arrows in Figure 6, each curved shape is formed so that when one traces a line from the bottom portion 30 in the order of first curved shape 10, second curved shape 11, and third curved shape 12, the point always moves from front to rear.

[0017] The shape of the rear end is such that, starting from the bottom surface portion 30, a fourth curved shape 20 that convex backward, a straight portion 21, and a fifth curved shape 22 that convex forward are formed continuously in this order. This shape allows the heel of the foot to be smoothly inserted along the rear end. Note that the straight portion 21 is not necessarily required, and the fourth curved shape 20 and the fifth curved shape 22 may be directly connected.

[0018] As can be seen from Fig. 6, the lower core H1 has a large width in the front-to-rear direction, but the upper core H2 has a shorter length in the front-to-rear direction than the lower core H1. Also, the width becomes smaller toward the tip X, and the tip is pointed toward the rear.

[0019] As can be seen from the front view of Fig. 2 and the rear view of Fig. 3, the width W1 of the lower core H1 is set to be larger than the width W2 of the upper core H2. The lower core H1 is formed with a sixth curved shape 40 that bulges outward on the left and right sides. This shape allows it to correspond to the skeletal structure of the heel of the foot. The width W3 of the bottom surface portion 30 is smaller than the width W1. The bottom surface portion 30 is formed horizontally and is set at the same height.

[0020] In the rear view of Fig. 3, the apex 42 of the core upper part H2 has a gently curved shape that convex upward, and arc portions 41 are formed on both the left and right sides. The arc portions 41 are followed by a gentle seventh curved shape 43, an eighth curved shape 44, and a sixth curved shape 40, which are continuous shapes. The sixth curved shape 40 is convex outward to the left and right, while the eighth curved shape 44 is convex inward. The seventh curved shape 43 may be formed by a straight portion.

[0021] FIG. 9 is a horizontal cross section of the upper core H2. The cross section is formed in a substantially U-shape with the front side open. An inner surface 50 and an outer surface 51 are formed so as to surround the heel. A reduced thickness portion (surface) that gradually reduces the thickness toward the end 51a is formed on the outer surface 51a. The reduced thickness portion is not formed on the inner surface 50. That is, the curvature of the inner surface 50 is constant in the vicinity of the end 51a, and the outer surface 51 is formed in a curve that approaches the inner surface 50 toward the end 51a. The same is true for the lower core H1 shown in FIG. 8. The size of the U-shape in the lower core H1 is larger than the size of the U-shape in the upper core H2. [Explanation of symbols]

[0022] K Heel core material H1 Lower core H2 Core upper part W1, W2 width 10 First curved shape 11 Second curved shape 12 Third curved shape 20 Fourth curved shape 21 Straight section 22 5th curved shape 30 Bottom part 40 6th curved shape 50 Inner surface 51 External surface 51a End

Claims

1. A heel core provided in a heel portion of a footwear product to facilitate insertion of a foot, The lower core and the upper core are integrally formed. It is formed in a roughly U-shape that surrounds the heel when viewed in a plan view, The lower part of the core material has a horizontal bottom surface, When viewed from the side, the shape of the front end portion is a shape in which, starting from the bottom surface portion, a first curved shape that is convex upward, a second curved shape that is convex downward, and a third curved shape that is convex upward are formed in this order, The rear end portion has a shape formed in the order of a fourth curved shape convex rearward and a fifth curved shape convex forward, starting from the bottom surface portion. When viewed from the front, the width of the lower part of the core material is set to be larger than the width of the upper part of the core material, The shape of the lower part of the core material in a front view has a sixth curved shape bulging outwardly to the left and right, The horizontal cross section of the upper part of the core material is formed into an approximately U-shape that surrounds the heel portion, and a thickness-reducing portion is formed in which the thickness gradually decreases toward the end, and this thickness-reducing portion is formed on the outer surface of the heel portion.

2. The heel core material according to claim 1, characterized in that, when viewed from the side, each curved shape is formed so that when points on a line are traced from the bottom surface portion in the order of the first curved shape, the second curved shape, and the third curved shape, the points always move from front to rear.

3. 3. The heel core according to claim 1, wherein a straight portion is formed between the fourth curved shape and the fifth curved shape.

Images