JP2016131799A - Top lift and manufacturing method of top lift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a top lift having sufficient antislip performance even with a small ground contact area and having sufficient durability.SOLUTION: In the top lift, a pin 1 is protruded from a base 2, the pin for attachment to a heel bottom part of a woman shoe. The base 2 is made of rigid urethane and includes a recess 23 formed on a ground contact face side 22 opposite to a side protruding the pin 1, the recess surrounded by the rigid urethane in an outer periphery and having a desired shape. In the recess 23, an antislip rubber material 3 containing glass fibers is arranged. With respect to the ground contact side 22 of the base 2, a ground contact face 31 of the antislip rubber material 3 is protruded by 0.1-1.0 mm.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a top lift mounted on the heel bottom surface of women's shoes and a method for manufacturing the top lift, and particularly has excellent slip resistance performance on snowy road surfaces and icing road surfaces and sufficient durability.

  Conventionally, there has been a technique for preventing slippage on a wet road surface by a top lift attached to the bottom of a heel of women's shoes. For example, Japanese Utility Model Publication No. 5-6808 shown as Patent Document 1 and Japanese Patent Application Laid-Open No. 8-10007 shown as Patent Document 2 describe a top lift made of a hard urethane resin and a soft urethane resin.

  Japanese Patent Application Laid-Open No. 2008-264143 shown as Patent Document 3 describes a top lift composed of two layers of a soft synthetic resin layer and a hard synthetic resin layer. Japanese Patent Application Laid-Open No. 2014-158538 shown as Patent Document 4 describes a top lift provided with a resin hard portion provided with a pin and a resin soft portion having a smaller hardness than the hard portion.

  In addition, Utility Model Registration No. 3021434 shown as Patent Document 5 describes a top lift made of a rubber composition having a JIS-A hardness of 60 to 100 and a William wear amount of 100 cc / HP · hr or less. Japanese Patent Laid-Open No. 2006-314673 shown as Patent Document 6 describes a lift made of a thermoplastic urethane resin elastomer containing a styrene-butadiene synthetic rubber and a wax.

  On the other hand, there are various types of footwear soles that have a function of preventing slipping on an icing road surface or a snowy road surface (this is referred to as “slip resistance performance” in the present application).

  For example, in Japanese Patent Application Laid-Open No. 7-143903 shown as Patent Document 7 and Japanese Patent Application Laid-Open Publication No. 2006-326137 shown as Patent Document 8, a glass fiber or a synthetic fiber such as nylon or aramid having a direction toward the bottom ground plane as an axis. A rubber layer containing short fibers and a rubber layer not containing these are alternately arranged. Japanese Patent Application Laid-Open No. 2008-93016 shown as Patent Document 9 describes that the entire footwear bottom is formed of a rubber layer containing short fibers of synthetic fibers such as glass fiber, nylon and aramid.

No. 5-6808 JP-A-8-10007 JP 2008-264143 A JP 2014-158538 A Utility Model Registration No. 3021434 JP 2006-314673 A JP 7-143903 A JP 2006-326137 A JP 2008-93016 A

  However, although all of those shown in Patent Documents 1 to 6 are intended to prevent slipping, they are intended to prevent slipping on icing road surfaces and snowy road surfaces, that is, to have anti-slip performance. Absent.

  Furthermore, when the ground contact surface such as the top lift is small, if the entire ground contact surface is made of a soft material as shown in Patent Documents 1 to 3, 5 and 6, the ground contact area is small and the wear is severe and lacks durability. Therefore, it is not practical. Moreover, even if the soft material is provided on a part of the grounding surface as shown in Patent Document 4, if there is a portion formed of the soft material up to the outer end of the top lift, this end Since the soft material of the part is extremely worn and the entire ground surface of the top lift is not evenly worn, it becomes very difficult to walk.

  On the other hand, the footwear soles shown in Patent Documents 7 to 9 are intended for the bottom portion having a certain amount of ground contact area, and are not intended for the heel portion of women's shoes having a very small ground contact area. Therefore, it is not appropriate from the viewpoint of durability to apply such a rubber footwear sole intended for a large ground contact area as it is to a top lift having a very small ground contact area because wear is intense. In addition, in the case of such a footwear bottom, since it is basically formed entirely of rubber, it is not necessary to consider the adhesion between rubber and urethane resin.

  By the way, the top lift has a small ground contact area, but a large load is applied and a pin for attaching to the bottom surface of the heel is required. Therefore, the portion where the pin is provided needs to be formed of, for example, a hard urethane resin in order to ensure strength. There is. On the other hand, it is desirable that the ground contact surface be made of rubber in order to exhibit slip resistance. However, the surface of the vulcanized rubber lacks activity, and it is difficult to obtain a chemical bond compared to the unvulcanized rubber, so the compatibility with the urethane resin is poor, and the vulcanized rubber and the urethane resin are usually integrally molded. Then it is difficult to bond.

  The present invention has been made to solve such problems. The object of the present invention is to have a sufficient slip resistance and a sufficient durability even with a small ground contact area called a top lift. Is to provide a top lift with.

  In order to achieve the above object, the top lift of the present invention is a top lift in which a pin for attaching to a heel bottom of a women's shoe protrudes from a base, and the base is made of hard urethane and the protruding side of the pin A recess having a desired shape whose outer periphery is surrounded by the hard urethane is formed on the grounding surface side opposite to the surface, and a slip-resistant rubber material containing glass fiber is disposed in the recess. Yes.

  In the present invention, it is preferable that the ground contact surface of the anti-slip rubber material protrudes by 0.1 to 1.0 mm from the ground contact surface side of the base.

  Moreover, in this invention, it is preferable that the clearance gap is provided between the outer peripheral side surface of the said anti-skid rubber material, and the inner peripheral side surface of the said recessed part of the said base.

  Moreover, in this invention, it is preferable that the outer peripheral side surface of the said anti-skid rubber material and the inner peripheral side surface of the said recessed part of the said base are in contact.

  In the present invention, the number of pins is preferably one or more.

On the other hand, the top lift manufacturing method of the present invention is characterized by the following steps in order.
(1) A step of vulcanizing and molding an unvulcanized rubber containing glass fiber to produce a sheet that becomes a slip-resistant rubber material.
(2) A step of applying a binder containing a polar solvent to one side of the sheet and then applying and drying a urethane resin adhesive.
(3) A step of cutting the sheet in accordance with the shape of the recess of the top lift to obtain a slip-resistant rubber material.
(4) Set the cut anti-slip rubber material in the mold so that the adhesive application side faces the urethane resin injection side, and if the pin is not molded simultaneously with the base with urethane resin, use a separately prepared pin. A step of setting the urethane injection portion in a state of floating in a hollow so as not to contact the anti-slip rubber material in the mold.
(5) A step of injecting hard urethane pellets with an injection molding machine, integrally molding the anti-slip rubber material and the urethane resin, and bonding them together.

  According to the top lift of the present invention, a slip-resistant rubber material excellent in slip resistance including a glass fiber is arranged in the center portion of the ground surface while having a small area called a top lift, and the periphery thereof is surrounded by a hard urethane resin. Since it did in this way, even if it is a small ground contact area called a top lift, the top lift which has sufficient slip resistance performance and sufficient durability can be provided. Further, according to the production method of the present invention, the vulcanized rubber and the urethane resin which are not compatible with the urethane resin can be bonded by integral molding because the surface activity is originally lacking and it is difficult to obtain a chemical bond. Since it has strength, it can be used as a top lift.

It is a top view which shows an example of the top lift which concerns on this invention. It is a side view of the top lift shown in FIG. It is the sectional view on the AA line of FIG.

[Example 1]
An embodiment of a top lift according to the present invention will be described with reference to FIGS.
The top lift of the present invention is provided such that a pin 1 for attaching to a heel bottom portion of a women's shoe projects from a base portion 2 in the same manner as a conventional top lift. The base 2 is made of hard urethane, and a recess 23 having a desired shape whose outer periphery is surrounded by the hard urethane of the base 2 is formed in the center portion of the grounding surface side 22 opposite to the protruding side 21 of the pin 1. . Further, as shown in FIG. 3, the pin 1 has a top portion 11 in a disc shape, and is formed so that the disc-like top portion 11 is embedded in the base portion 2.

  The recess 23 is provided with a slip-resistant rubber material 3 containing glass fibers. The anti-slip rubber material 3 includes, for example, a rubber matrix mixed with short glass fibers whose axial direction is toward the ground surface, or a short glass fiber and nylon short fibers whose axial direction is toward the ground surface. A mixture can be used. However, the anti-slip rubber material 3 is not limited to these, as long as at least glass fibers are mixed in the rubber matrix, and the direction of the glass fibers can be arbitrarily selected.

  Further, the ground contact surface 31 of the anti-slip rubber material 3 protrudes from the ground contact surface side 22 of the base 2 by 0.1 to 1.0 mm. With such a configuration, when the ground is grounded, the ground contact surface 31 of the slip-resistant rubber material 3 is first grounded to the ground, so that the slip resistance performance is surely exhibited.

  The recess 23 is formed to be slightly larger than the anti-slip rubber material 3, and a gap 4 is provided between the outer side surface of the anti-slip rubber material 3. Since the slip-resistant rubber material 3 can be freely deformed by the gap 4, depending on the hardness and type of the slip-resistant rubber material 3, the slip-resistant performance can be easily exerted and excessive wear can be prevented.

  However, since the anti-slip rubber material 3 is surrounded by the ground contact surface side 22 of the base 2 through the gap 4, the anti-slip rubber material 3 is not deformed beyond a certain amount, so that the anti-slip rubber material 3 is in a crushed state. No slip resistance is lost suddenly.

  Further, since the ground contact surface side 22 of the base portion 2 is also worn by coming into contact with the ground, the ground contact surface 31 of the slip resistant rubber material 3 always protrudes more than the ground contact surface 22 of the base portion 2 when not deformed. Will be.

  This will be described in more detail. When the top lift contacts the ground, the anti-slip rubber material 3 first comes into contact with the ground. When the anti-slip rubber material 3 is deformed by the amount of protrusion from the grounding surface side 22 of the base portion 2 and the height thereof becomes equal to the grounding surface side 22 of the base portion 2, both come into contact with the ground at the same time. Then, the anti-slip rubber material 3 and the grounding surface side 22 of the base 2 are worn simultaneously. However, even in this state, the slip resistant rubber material 3 is pressed against the ground because the compressive force is applied to the slip resistant rubber material 3, so that the slip resistant performance is not reduced. Since the anti-slip rubber material 3 is surrounded by the base 2 made of hard urethane, excessive wear of the anti-slip rubber 3 alone is prevented when the ground surface side 22 of the base 2 is grounded and receives a load. The

  On the other hand, when the top lift is separated from the ground, the anti-slip rubber material 3 returns to its original shape because there is no compression force. However, the height is reduced by the amount of wear. On the other hand, since the shape of the base 2 hardly changes even when the compressive force is lost, the height of the ground contact surface side 22 is lowered by the amount of wear. That is, the anti-slip rubber material 3 and the ground contact surface side 22 of the base portion 2 are worn at the same time when the ground is touched, but the anti-slip rubber material 3 has a larger amount of deformation at the time of ground contact, so when the compressive force is lost. Therefore, the slip-resistant rubber material 3 always protrudes from the grounding surface side 22 of the base 2.

  Accordingly, since the ground contact surface 31 of the anti-slip rubber material 3 is first grounded on the ground when walking and the anti-slip performance is ensured, the contact surface side 22 of the base 2 comes into contact with the ground. Always secured. On the other hand, since the anti-slip rubber material 3 is surrounded by the base 2 made of hard urethane, excessive wear of the anti-slip rubber material 3 is prevented when the grounding surface side 22 of the base 2 receives a load during walking. . Therefore, the slip resistance performance of the top lift over a long period of time is ensured.

  In this embodiment, the gap 4 is shown as an example. However, depending on the type and characteristics of the anti-slip rubber material 3, the gap 4 may not be present. It may be in direct contact. In this case, a mold for partitioning the anti-slip rubber material 3 and the recess 4 at the time of molding becomes unnecessary. When the gap 4 is not provided in this way, it is possible to prevent the glass fibers in the outer peripheral portion of the anti-slip rubber material 3 from falling or falling.

  Also, the number of pins 1 may be one as shown in the figure, but a plurality of pins may be provided when there is a certain area as for a pump. As the material of the pin 1, conventionally used materials such as aluminum, stainless steel, and iron can be used. The pin 1 may be formed by integral molding with the base 2 and the same material. In this case, it is not necessary to set the pin 1 in the mold at the time of molding by the manufacturing method of Example 2 described later.

  In FIG. 3, the thickness between the pin protruding side 21 and the grounding surface side 22 of the base 2 is 4 to 7 mm, and the thickness between the pin protruding side 21 and the bottom surface of the concave portion at the portion where the concave portion 23 is formed. The thickness is set to 2 to 4 mm, and the thickness between the bottom surface of the concave portion of the anti-slip rubber material 3 and the ground contact surface 31 is set to about 2 to 4 mm. Further, the gap between the inner peripheral side surface of the recess 23 and the outer peripheral side surface of the anti-slip rubber material 3 is about 0 mm to 2.0 mm. However, these dimensions can be selected as appropriate.

  Further, in FIG. 1, the base 2 is a horseshoe shape and the anti-slip rubber material 3 is hexagonal, but these shapes can be appropriately selected, and the periphery of the anti-slip rubber material 3 is hard in any case. What is necessary is just to be enclosed by the base 2 made from urethane.

[Example 2]
Next, the manufacturing method of the top lift of this invention is demonstrated.
First, the slip-resistant rubber material containing the glass fiber used in the present invention will be described. An example of a method for producing unvulcanized rubber when glass fibers are included is shown in (1) below, and an example of a method for producing unvulcanized rubber when glass fibers and nylon fibers are contained is shown in (2) below. An example of a method for producing a slip-resistant rubber material using these unvulcanized rubbers is shown in (3) below.

(1) Manufacture of unvulcanized rubber containing glass fiber If the direction of short glass fiber is aligned as much as possible on unvulcanized rubber, it is rolled to a desired thickness in the range of 3 mm to 8 mm. An example of specific components is as follows. In addition, even if the direction of the short glass fiber is not necessarily aligned, the fiber has the property that the direction naturally aligns in the rolling direction by rolling.

SBR 40.0 phr
IR 60.0
ZnO 5.0
Stearic acid 1.5
White carbon 20.0
Polyethylene glycol 0.5
Glass fiber 20.0
Sulfur 1.7
Vulcanization accelerator 3.5

(2) Manufacture of unvulcanized rubber containing glass fibers and nylon fibers If possible, align the glass short fibers and nylon short fibers in unvulcanized rubber and roll them to a desired thickness in the range of 3 mm to 8 mm. . An example of specific components is as follows. In addition, even if the directions of the short glass fibers and the short nylon fibers are not necessarily aligned, by rolling, these fibers have a property that the direction naturally aligns with the rolling direction.

SBR 40.0 phr
IR 60.0
ZnO 5.0
Stearic acid 1.5
White carbon 20.0
Polyethylene glycol 0.5
Glass fiber 20.0
Nylon fiber 2.0
Sulfur 1.7
Vulcanization accelerator 3.5

(3) Manufacture of anti-slip rubber material Next, anti-slip rubber material is manufactured using the unvulcanized rubber containing the glass fiber of (1) and the unvulcanized rubber containing the glass fiber and nylon fiber of (2). To do.
The unvulcanized rubber containing the glass fiber of (1) or the unvulcanized rubber containing the glass fiber of (2) and the nylon fiber are laminated with a desired number of layers, and the unvulcanized rubber is added to a predetermined thickness. Sulfur molding. Alternatively, the desired number of unvulcanized rubbers (1) and (2) above are alternately stacked and laminated, and the unvulcanized rubber is vulcanized to a predetermined thickness. At this time, the unvulcanized rubber is laminated with the rolling direction aligned so that the directions of glass fiber and nylon fiber are aligned. Then, the vulcanized laminated rubber is cut into a thickness of about 3 mm to 5 mm so as to be perpendicular to the rolling direction to obtain a sheet-like anti-slip rubber material. Then, since the glass short fiber or the nylon short fiber is oriented in the direction of the cut surface, this surface is made to be the ground contact surface. In addition, the thickness of the slip-resistant rubber material to be formed into a sheet shape is set to be slightly thicker than the depth of the concave portion of the top lift to be manufactured.

Next, the manufacturing method of the top lift of the present invention using the above-mentioned slip resistant rubber material is shown in the following (4).
Since the surface of the vulcanized rubber lacks activity and it is difficult to obtain chemical bonds, the compatibility with the urethane resin is poor. Accordingly, the top lift is manufactured by bonding the anti-slip rubber material and the hard urethane resin by integral molding by the following methods (a) to (d).

(4) Manufacturing method of top lift (a) A binder (primer) is applied to the surface of the slip resistant rubber material sheet of the above (3) on the side opposite to the ground contact surface (the surface to be bonded to urethane). For example, a polar solvent such as MEK (methyl ethyl ketone) or DMF (N, N-dimethylformamide) is used as the binder. Then, the coated surface is dried at room temperature. Next, an adhesive mainly composed of a modified urethane resin is applied thereon and dried at room temperature for about 2 hours. In addition to an adhesive mainly composed of a modified urethane resin, a few percent of an aromatic urethane resin curing agent may be added.

(B) Next, the sheet of the anti-slip rubber material from which the adhesive has been dried is cut into a hexagon as shown in FIG. 1, for example, according to the shape of the recess of the top lift to be manufactured. The size of the cut is slightly smaller than the recess when a gap is provided between the recess of the urethane resin serving as the base and the anti-slip rubber material.
When no gap is provided, the size is approximately equal to the size of the recess. In this case, the shape of the concave portion of the urethane resin serving as the base is determined by the shape of the anti-slip rubber material.
The shape to be cut can be arbitrarily selected.

(C) Next, the cut anti-slip rubber material is set in the mold so that the grounding surface is in contact with the mold and the adhesive application surface side faces the urethane injection side.
Further, when the pins are not simultaneously molded with the base portion with urethane resin, the separately prepared pins are set in the urethane injection portion in a state of floating in a hollow so as not to contact the anti-slip rubber material.

(D) Hard urethane pellets are injected by an injection molding machine, and a urethane resin and a slip-resistant rubber material as a base are integrally molded and bonded. Thereby, the top lift of the present invention is manufactured. Vulcanized rubber and urethane resin, which are not originally bonded, are pre-applied with urethane resin adhesive and baked and molded at about 200 ° C. Will be performed.
In addition, when the applicant conducted a peeling experiment in order to confirm the adhesiveness, peeling occurred at 120N to 160N, most of which was destruction on the rubber surface. Therefore, it was confirmed that the adhesion between the anti-slip rubber material and the urethane resin is strong and sufficiently withstands the use as a top lift.

  The top lift of the present invention can be used not only for a heel having a very small ground contact area such as a pin heel, but also for those having a certain ground contact area such as a heel portion of a pump of a women's shoe.

DESCRIPTION OF SYMBOLS 1 Pin 11 Top part 2 Base part 21 Pin protrusion side 22 Grounding surface side 23 Recessed part 3 Anti-slip rubber material 31 Grounding surface 4 Gap

Claims (6)

A top lift with pins for attaching to the heel bottom of women's shoes protruding from the base,
The base is made of hard urethane, and a recess having a desired shape whose outer periphery is surrounded by the hard urethane is formed on the grounding surface side opposite to the protruding side of the pin,
A top lift characterized in that a slip-resistant rubber material containing glass fiber is disposed in the recess.   2. The top lift according to claim 1, wherein a ground contact surface of the anti-slip rubber material protrudes by 0.1 to 1.0 mm from a ground contact surface side of the base portion.   The top lift according to claim 1, wherein a gap is provided between an outer peripheral side surface of the anti-slip rubber material and an inner peripheral side surface of the concave portion of the base portion.   The top lift according to claim 1, wherein an outer peripheral side surface of the anti-slip rubber material is in contact with an inner peripheral side surface of the concave portion of the base portion.   The top lift according to any one of claims 1 to 4, wherein the number of the pins is one or more. A top lift manufacturing method according to claim 1, wherein the top lift is manufactured through the following steps in order.
(1) A step of vulcanizing and molding an unvulcanized rubber containing glass fiber to produce a sheet that becomes a slip-resistant rubber material.
(2) A step of applying a binder containing a polar solvent to one side of the sheet and then applying and drying a urethane resin adhesive.
(3) A step of cutting the sheet in accordance with the shape of the recess of the top lift to obtain a slip-resistant rubber material.
(4) Set the cut anti-slip rubber material in the mold so that the adhesive application side faces the urethane resin injection side, and if the pin is not molded simultaneously with the base with urethane resin, use a separately prepared pin. A step of setting the urethane injection portion in a state of floating in a hollow so as not to contact the anti-slip rubber material in the mold.
(5) A step of injecting hard urethane pellets with an injection molding machine, integrally molding the anti-slip rubber material and the urethane resin, and bonding them together.

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