JPH06108U - Shoe lift structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a lift structure that enhances the commercial value of shoes by forming the lift with two upper and lower resin layers and by selecting and molding the resins that meet the requirements. [Composition] In a shoe in which a replaceable lift 3 is attached to the lower end of the heel 2, the lift 3 is provided on two upper and lower resin layers 3A, 3B
Formed from. Then, one of these two resin layers is formed of a hard resin, while the other layer is formed of a relatively soft resin. Further, in order to integrally mold the upper and lower resin layers, the bonding hole 3a is formed in one of the layers and the bonding protrusion 3b is formed in the other layer. For example, the upper layer is a nylon resin layer and the lower layer is a urethane resin layer.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lift structure, which is integrally molded with two resin layers and is attached to the lower end of the heel of men's or women's shoes, and exhibits excellent effects in terms of health and comfort.

[0002]

[Prior art]

 The heel structure of shoes has changed with the recent diversification of consumer needs and health consciousness. Conventionally, the lift attached to the lower end of the heel is easily worn, and its lift interchangeability is one of the important issues. Originally, iron wheel lifts, hard rubber, etc. were used as lifts for women's shoes, but there is a problem in terms of wear resistance, etc., and urethane resins, which have excellent wear resistance, have recently become the mainstream as lift materials. There is. However, the need for replacement has not disappeared. Especially, the weight of the lift attached to the lower end of the heel of shoes such as high heels is the highest, and the area is small, so the wear is severe and the frequency of replacement is high. In the past, it was difficult to replace a lift at a shoe repair shop, resulting in a shorter product life. Therefore, there is also proposed a heel device as disclosed in Japanese Utility Model Publication No. 63-4407, which allows a layman to replace a worn lift relatively easily. By the way, the conventional lift is molded as an "integral unit" with urethane resin or the like, although there is a difference whether it is easy to replace it.

[0003]

[Problems to be solved by the device]

 The conventional lift has the following problems because the entire lift is molded integrally with one resin layer. When the entire lift was made of solid urethane resin, it was uncomfortable in terms of health and comfort, such as the impact of the impact on the head while walking on a hard floor. In addition, black colors (coloring with carbon black) are often used to make the feet look tight due to the design, and this sometimes soiled the floor when walking. On the other hand, if the entire lift is made of a soft resin in consideration of health, the lift may tilt and bend when walking due to the weight applied.

In view of the above points, an object of the present invention is to enhance the commercial value of shoes by forming a replaceable lift with upper and lower two resin layers, and selecting and integrally molding a resin having properties that meet each requirement. To provide a lift structure.

[0005]

[Means for Solving the Problems]

 In order to achieve the object, the present invention provides a shoe with a replaceable lift attached to the heel bottom, in which the lift is formed of two resin layers, one of which is a hard resin and the other of which is a hard resin. The shoe lift structure is characterized by forming a relatively softer resin layer than this, and forming a joint hole in one of the layers and a joint protrusion in the other layer in order to integrally mold the upper and lower resin layers. Is. Further, in this structure, the upper layer is a nylon resin layer and the lower layer is a urethane resin layer.

[0006]

[Action]

 In the above structure, the lift is formed in the upper and lower two layers, so that the upper and lower layers can be formed by the resin layers having the properties that meet the requirements. In other words, if one of the upper and lower layers that make up the lift is made of a hard resin layer and the other is made of a resin that is relatively softer than this, the impact absorption force of the soft resin layer may cause the impact reaction force from the floor to echo in your head. It will be lost and will be good for your health and comfortable to wear. In addition, the other hard resin layer ensures sufficient rigidity of the lift as a whole, and there is no possibility that the lift may tilt and the foot may bend due to the weight. Also, different colors can be used for the upper and lower layers, and especially when the lower layer is a urethane resin layer, it is easy to obtain a bright natural color and soiling of the floor can be prevented.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of a heel portion of a shoe to which the present invention is applied, FIG. 2 is a cross-sectional view of a main portion of the heel portion, and FIGS. 3 (a) to 3 (d) are schematic views showing an example of a method of forming a lift according to the present invention. FIG. The shoes of the embodiments shown in FIGS. 1 and 2 are examples of women's shoes, but the same applies to men's shoes. Such a shoe is composed of a shoe body 1, a heel body 2 made of hard plastic protruding from the rear bottom surface of the shoe body 1, and a two-layer lift 3 to be described later attached to the lower end of the heel body 2. Has been done. The heel body 2 may be divided into upper and lower layers.

The heel body 2 is continuously and integrally attached to the bottom surface of the shoe body 1, and a cutout groove 4 that opens downward inward is formed on the lower surface of the heel body 2. A fitting hole 5 is formed near the center of the lower surface of the heel body 2. A metal fitting 6 protruding from the upper surface of the horseshoe-shaped lift 3 is fitted into the fitting hole 5 so that the heel body 2 and the lift 3 are integrally coupled as shown in FIG. ing. The fitting 6 has a flange portion 6a at its lower end, and the fitting 6 is embedded in the lift 3 and is integrally fixed to the lift 3. Further, the fitting portion 6b of the fitting member 6 is provided with a large number of vertical grooves for enhancing the adhesion and for stopping the rotation of the lift 3. The notch groove 4 is used when the worn lift 3 is removed from the heel body 2 and replaced. That is, as shown by the imaginary line in FIG. 2, the tip of a tool D such as a flat-blade screwdriver is inserted into the notch groove 4, and the lift 3 is removed from the heel body 2 by the lever principle. Since the notch groove 4 is provided on the inner side of the lower surface of the heel body 2, even if there is no outer skin (rolling up), it is not particularly noticeable from the outside and the appearance of the shoe is not impaired.

Here, the lift structure according to the present invention will be described in detail. As shown in FIG. 2, the lift 3 is composed of upper and lower two resin layers 3A and 3B. That is, the lift 3 is not made of one resin as a whole as in the conventional case, but is made up of two resin layers, an upper layer 3A and a lower layer 3B, which divide the upper and lower parts into approximately half parts. For example, one of the upper and lower layers is formed of a hard nylon resin layer, and the other is formed of a relatively soft urethane resin layer. For example, the upper and lower layers may be formed of the same urethane resin layer instead of the different upper and lower resin layers. When the upper and lower resin layers are different in this way, it becomes easy to provide the upper and lower layers of the lift with the required mechanical properties. However, it is also possible to dispose the same resin having different hardnesses in the upper and lower two layers. One of the upper and lower layers is a relatively soft resin layer because it has a shock absorbing function so that the impact does not resonate to the head while walking on a hard road surface, and the health and comfort Is to improve.

In addition, when the lower layer 3B is made of urethane resin in particular, the black color (carbon black coloring) used for making the feet feel tight can stain the floor during walking. Therefore, the urethane resin is placed in the lower layer and its bright natural color is used to prevent it.

On the other hand, the reason why either the upper layer or the lower layer is made of a hard resin is that, if both the upper layer 3A and the lower layer 3B are integrally formed of the same soft resin, the lift 3 as a whole becomes insufficient in rigidity and walking There is a risk of leaning and twisting the legs due to the weight being applied, but by constructing the half of the layers that make up the lift with a hard resin layer, the rigidity required for the entire lift can be given, This is because this fear disappears.

By thus forming the upper and lower lifts in two layers, it is possible to appropriately select resins having properties that meet the requirements and arrange them in the upper and lower layers. In particular, different resin layers can be used to form a composite function. It is possible to realize a lift with multiple points.

The upper and lower resin layers forming the lift structure of the present invention are not integrally joined by an adhesive, but are integrally formed by concave-convex fitting in a forming step as described later. That is, as shown in FIG. 2, a plurality of contact protrusions 3b formed on the upper surface of the resin layer of the lower layer 3B are integrally connected in such a manner that they are fitted into the joint holes 3a formed in the resin layer of the upper layer 3A. It is a thing. The reason why such an integrated structure is used is that if the upper and lower layers are urethane resin layers, it is possible to use the adhesiveness of the upper and lower layers to integrally bond them with an adhesive. This is because burrs are exposed from the surface and the external appearance deteriorates. Moreover, even if the adhesiveness is poor such as nylon resin, it can be used as a constituent resin of the lift material.

Since the lift structure of the present invention is as described above, it can be manufactured by injection molding. Here, the lift forming method will be described based on the schematic diagrams of FIGS. 3 (a) to 3 (d). Figure (a): The fitting tool 6 is set and fixed in advance to a mold (female mold) 7 having a protrusion 7a having a trapezoidal cross section inside, and a male mold 8 is applied to lift it into the mold. A cavity 3A 'to be an upper layer is formed. After the mold is clamped, a predetermined molten resin (for example, urethane resin) is injected from the injection port. At this time, the molten resin also reaches the gap between the collar portion 6a of the fitting 6 and the mold 7, and the fitting 6 is embedded and fixed.

After the resin is solidified through a predetermined process, the mold is opened and the molded product of the lift upper layer is released from the mold.

A trapezoidal space having an inverse taper, that is, a joint hole 3a is formed in a part of this molded product. Figure (b): Set the molded product that is the upper layer of this lift in another female die 9 and apply the male die 8 in the same manner. Figure (c): Then, a cavity 3B 'for forming a lower layer of the lift is formed in this mold. After clamping the mold, inject molten resin (eg nylon resin) from the injection port. The nylon resin is also filled in the joining hole 3a of the reverse taper trapezoidal cross section formed in the upper layer resin. After the injected resin has solidified, the mold is opened and the molded product is released and taken out to obtain the lift molded product of the present invention as shown in Fig. (D).

Since the bonding hole 3a is formed in an inverted trapezoidal cross section, when the lower layer resin is filled therein, an inversely tapered bonding protrusion 3b is formed, and the resin layer of the lower layer 3B cannot be separated. It will be integrally molded (bonded) to the resin layer of 3A. In this lift structure, the joint hole 3a is a through hole so that the mold can be opened. The shape or arrangement of the joining projections 3b that enter the joining holes 3a is such that, for example, as shown in FIG. 4, three or four conical or mushroom-shaped projections 3b are formed on the surface of the horseshoe-shaped lower layer 3B depending on the surface area thereof. To Further, as shown in FIG. 5, a U-shaped continuous protrusion 3b may be formed in a space other than the flange 6a of the fitting 6, or two protrusions 3b may be formed vertically or horizontally. You may form.

In FIG. 6, if the mold can be opened using a nesting mold, the lift can be integrally joined without penetrating the joining hole as in the above embodiment. As in the above-mentioned embodiment, the upper and lower layers are non-separable, in which (a) a hollow head-shaped protrusion 3b and (b) a wart-shaped protrusion 3b.

[0019]

[Effect of device]

 The present invention described above has the following effects. By forming the lift in the upper and lower layers, it is possible to select the resin layers having the properties that meet the requirements and arrange the resin layers in the upper and lower layers. In other words, if one of the upper and lower layers that make up the lift is made of a hard resin and the other layers are made of a relatively soft resin, the impact from the floor will be heard while ensuring sufficient rigidity for the entire lift. It has a good lift structure in terms of health and comfort. The upper and lower layers can have different colors, and in particular, when the lower layer is made of urethane resin and a bright natural color is used, the floor can be prevented from being soiled. Since the two-layer lift structure of the present invention can be integrally molded as an injection molded product, the lift has a beautiful finish and can be a product of high commercial value.

[Brief description of drawings]

FIG. 1 is a perspective view of a heel portion of a shoe to which the present invention is applied.

FIG. 2 is an enlarged side sectional view of a heel portion including a lift.

3 (a) to 3 (d) are cross-sectional views schematically showing a method of forming a lift according to the present invention.

4A and 4B are a plan view and a perspective view of a lift lower layer showing an example of forming a joint protrusion.

5 (a), (b) and (c) are plan views of a lower lift layer showing various modes of forming joint protrusions.

6 (a) and 6 (b) are other embodiments of the lift structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Shoes 2 ... Heel body 3 ... Lift 3A ... Upper layer 3a ... Joining hole 3B ... Lower layer 3b ... Joining protrusion 4 ... Notch groove 6 ... Fitting metal fitting 6a ... Collar part

Claims (2)

[Scope of utility model registration request] 1. In a shoe having a replaceable lift attached to a heel bottom, the lift is formed of two resin layers, an upper resin layer and a lower resin layer. A shoe lift structure characterized by being formed of layers, and in order to integrally mold the upper and lower resin layers, a joint hole is formed in one of the layers and a joint protrusion is formed in the other layer. 2. The lift structure for a shoe according to claim 1, wherein the upper layer is made of nylon resin and the lower layer is made of urethane resin.