JP2007054502A - Lift, shoe heel and shoe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lift allowing easy manufacture and prevention of coming off, and to provide a shoe heel, in which the lift and a heel base are stably fixed. <P>SOLUTION: The lift has a fixing pin formed by insert molding. The lower part of the pin is supported by a projection provided on a lift body. Even if the lift is prepared using soft synthetic resin, it is possible to prevent the lift from coming off the heel base. Antislip characteristics of the lift is improved by using the soft synthetic resin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lift capable of strengthening the connection between a lift and a heel base, a shoe heel to which the lift is attached, and a shoe having the shoe heel.

  A lift made of hard rubber or the like is attached to the end of a heel such as women's shoes. In order to prevent damage to the heel base, a new one is appropriately replaced when the lift body is worn.

  In general, the heel base and the lift body are joined by nailing, attaching with an adhesive, pressing a lift having a synthetic resin protrusion, or as shown in FIG. There is a type in which a vertical body (15) is formed in the base (11), and a lift body (1) in which a metallic attachment pin (5) is insert-molded in advance is fitted and attached to the hole.

  For example, a wide elongated wall-shaped mounting projection that stands vertically on the upper surface of the lift is provided, and the heel base and the lift body are pressed from above and below while maintaining the horizontal state, and the lift mounting projection is placed in the lift mounting hole of the heel. There is a method of fitting and attaching a lift to the bottom of the heel (Patent Document 1). According to this method, even in the case of a setback type in which the lower part of the heel is formed so as to flow backward, the lift can be attached to the bottom surface of the heel efficiently and safely.

  There is also a method in which a lift having two projections made of soft synthetic resin is inserted into two insertion holes formed in the bottom of the heel, and the two insertion holes and the projections are respectively inserted (Patent Document 2). ). According to this method, the heel and the lift can be easily and reliably engaged, and the fixing force thereof is strengthened.

Further, there is a method in which a heel protection member having a through hole is provided between the heel and the lift, and a lift in which a metal mounting pin is previously attached by insert molding is fitted into the through hole of the heel protection member. (Patent Document 3).
JP 2002-248007 A JP-A-7-255507 JP 2004-57314 A

  However, if a lift having a single metal mounting pin on a heel base having a small lift cross-sectional area is used, the pin may come off from the lift body, particularly when using a soft synthetic resin. . For this reason, it is necessary to improve the lift body by using a resin having high hardness, insert molding two or more pins, or thickening the pins. However, if the hardness of the resin is increased, it becomes slippery during use and the usability is lowered. Further, it is difficult to use two or more pins or to make the pins thicker with a pipe heel having a small lift surface.

  On the other hand, in order to improve the slipperiness of the lift, there is a method in which double molding is performed, the vicinity of the heel joint is molded with a hard synthetic resin, and the floor contact surface is manufactured with a soft synthetic resin. In addition, the number of manufacturing processes increases and the manufacturing unit price becomes high.

  Therefore, an object of the present invention is to provide a lift that is difficult to be detached even when joined to a heel base and is easy to manufacture.

  It is another object of the present invention to provide a lift having moderate hardness and flexibility, and thus excellent in feeling of use while ensuring wear resistance and slip resistance.

  In addition, it aims at providing the shoe heel which inserted the said lift, and the shoes which have this shoe heel.

  As a result of detailed research on the method of joining the lift and the heel base, the inventor has formed a mounting pin with an insert molding so that the lower part of the pin is supported by a convex portion provided on the lift body. Even when the lift body is molded from a soft synthetic resin, it has been found that the pins can be efficiently prevented from coming off the lift body, and the present invention has been completed.

  In the lift according to the present invention, since the pins are supported by the convex portions provided on the lift, even when the lift body is formed of a soft synthetic resin, it is difficult to come off the lift body.

  Moreover, since a soft synthetic resin can be used, cushioning property can be ensured, slipperiness can be reduced, and a usability can be improved.

  A first aspect of the present invention is a lift in which a mounting pin is insert-molded, and a lower portion of the pin is supported by a convex portion provided on the lift body. An example of a preferred embodiment of the present invention will be described with reference to FIG.

  FIG. 1A is a cross-sectional view of the lift body and the heel base, and FIG. 1B is a view showing a state in which the lift body and the heel base are inserted. In FIG. 1A, 1 is a lift body, 3 is a lift projection, 5 is a mounting pin, 7 is a lift projection, 11 is a heel base, 13 is a lift projection fitting hole, 15 is a vertical hole, 17 Indicates a lift projection fitting hole.

  In the present invention, the bottom of the pin (5) is embedded in the lift body (1) by insert molding, and a part of the pin (5) protruding from the lift body (1) is provided in the lift body (1). It is supported by the convex part (3). Thus, the stability of the pin (5) protruding from the lift body (1) is ensured by the formation of the convex portion (3), and the size and shape of the convex portion (3) can be achieved if the purpose can be achieved. It doesn't matter. Although there is no restriction | limiting regarding the height (h1 of Fig.1 (a)) of a lift main body (1) in particular, Generally it is 4-9 mm, More preferably, it is 5-7 mm. The height of the convex portion (3) (h2 in FIG. 1 (a)) is 0.5 to 30 mm, more preferably 1 to 10 mm in terms of securing the strength of the pin (5) and the lift body (1). Preferably there is. Further, if the length of the pin (5) protruding from the convex portion (3) (h3 in FIG. 1 (a)) is 10 to 100 mm, more preferably 10 to 15 mm, it is attached to the heel base (11). Excellent strength afterwards.

  The shape of the projection (3) provided on the lift body (1) is not particularly limited, but when the thickness increases from the tip of the projection (3) toward the bottom, the stability of the lift body (1) and the pin (5) is increased. Excellent in strength after fitting with the heel base (11). In this case, for example, the convex portion (3) is not limited to the shape of the lift main body (1). For example, the convex portion (3) may be a pyramid shape as shown in FIG. 2 (a) or a conical shape as shown in FIGS. It may be in the shape. 2D, 2E, and 2F are plan views of FIGS. 2A, 2B, and 2C. The protrusion (3) has the same shape from the bottom to the tip, or narrows from the bottom to the tip, because of the necessity of fitting with the heel base (11). The area is 1 to 30% of the area of the lift body (1), more preferably 1 to 15%, and particularly preferably 2 to 10%. If it is less than 1%, the stability effect of the pin (5) by the convex part (3) may be reduced. On the other hand, if it exceeds 30%, the fit between the heel base (11) and the lift body (1) may be reduced. May be reduced.

  In this invention, you may have a projection part (7) on the pin (5) protrusion surface of a lift main body (1). The formation of the projection (7) can be used as a guide for the mounting direction when the lift main body (1) is attached to the heel base (11), and the lift main body (1) and the heel base (11) After fitting, the heel base (11) is fixed by at least two points of the pin (5) and the projection (7), so that the direction is stable and the lift body (1) Fixing becomes stronger.

Such a protrusion (7) is only required to be able to be easily fitted to the heel base (11) and to ensure the directional stability after mounting. For example, the diameter is 0.5 to 3 mm, more preferably 1 to 2 mm. Further, it is preferably a columnar or prismatic projection having a length of 1 to 10 mm, more preferably 1 to 5 mm. The number in particular of a projection part (7) is not restrict | limited, It is 0-4 pieces, More preferably, it is 1-2 pieces. However, when the cross-sectional area of the lift is 30 to 200 mm ² or less, such as a so-called pin heel, the number is preferably one or two.

  There is no limitation in particular in the material of a lift main body (1), The thing similar to the past can be used. On the other hand, in the present invention, since the lift (1) is provided with the convex portion (3), the stability of the pin (5) is improved and the connection with the heel base (11) is strengthened. Even if a soft synthetic resin that could not be used is used for the lift body (1) and the projection (3), the pin (5) is rarely detached from the lift body (1). Conventionally, since a hard synthetic resin is used, slipping with the floor surface has been a problem, but slipping can be reduced or a high footstep sound can be reduced.

  As such a soft synthetic resin, for example, those having a hardness of JIS A 70 to 90 and Shore D 40 to 80 are preferable. Examples of such resins include polystyrene-polyisobutylene-polystyrene thermoplastic elastomers; blended polyolefin thermoplastic elastomers mechanically blended with olefinic rubbers and polyolefinic resins, and organics when kneading olefinic rubbers with polyolefinic resins Thermoplastic elastomers such as partially crosslinked blended polyolefin thermoplastic elastomers with partially cross-linked rubber phase by addition of fluorinated oxides, fully crosslinked blended polyolefin thermoplastic elastomers such as EPDM / polypropylene blends; polyvinyl chloride heat Polyurethane-based thermoplastic elastomers; Polyester-based thermoplastic elastomers; Polyamide-based thermoplastic elastomers; 1,2-polybutadiene-based thermoplastic elastomers Etc. can be exemplified. Among these, polyurethane-based thermoplastic elastomers are preferable because they are excellent in wear resistance and flexibility. Commercially available products can be used as such polyurethane-based thermoplastic elastomers. For example, Elaston ET500 type, Elaston ET600 type, Elaston ET800 type and the like manufactured by BASF can be suitably used. Of these, Elaston ET680, Elaston ET164D, etc., among the Elaston ET600 types are particularly suitable.

  The lift main body (1) and the convex portion (3) can be formed integrally with the resin, and for example, it is easy to use the resin and inject it into a mold to which the pin (5) is fixed. Can be prepared. The pin (5) having a conventionally known shape can also be used in the present invention.

  The second of the present invention is a shoe heel in which the lift is inserted into a heel base.

  In the shoe heel of the present invention, the pin (5) is fixed by the convex portion (3) provided on the lift body (1), and the heel base (11) is also, for example, as shown in FIG. The concave portion (13) is provided in a shape that can be fitted to the convex portion (3). The shoe heel constructed in this way is fitted with a lift projection that can be fitted with the projection (3) provided on the lift body (1) and the pin (5) provided on the heel base (11). Since it connects with the joint hole (13), it is stably fixed even after the lift body (1) and the heel base (11) are inserted. Moreover, when the protrusion (7) is provided in the lift main body (1), the lift protrusion part fitting hole (17) corresponding to it is also provided in the heel base (11). In the shoe heel of the present invention, even when the lift (1) is prepared from a soft synthetic resin, the pin (5) is unlikely to come off from the lift body (1) during use, and slips during use because it is a soft synthetic resin. There are few things and it is excellent in safety.

  The shape of the heel base (11) is not limited. However, generally, the vertical hole (15) provided in the heel base (11) has a metal tube inserted therein. Therefore, the lift protrusion fitting hole (13) may be formed by molding a heel base resin so that a part of the heel base (11) can be fitted to the protrusion (3). A metal tube may be inserted in the same manner as the lift projection fitting hole (13). Further, the height of the heel base (11) is not particularly limited. However, a pin heel having a small lift cross-sectional area tends to easily disengage the lift body (1) from the heel base (11). Such a heel base (11) is particularly effective.

  A third aspect of the present invention is a shoe having the above shoe heel. The shoes of the present invention are not limited at all except for the shoe heel, and widely include those having the shoe heel of the present invention.

  EXAMPLES Next, although an Example is given and this invention is demonstrated concretely, these Examples do not restrict | limit this invention at all.

(Example 1)
According to Fig. 4 (a), the bottom of a pin with a diameter of 3mm is supported by a lift of 18mm x 11mm x 4.5mm with a convex part with a bottom diameter of 6.5mm, a height of 4.5mm and a top diameter of 4.5mm Then, a lift having pins protruding to 11 mm was created. The lift and the convex part were integrally molded with a polyurethane-based thermoplastic elastomer (BASF Corporation, trade name “Elaston ET164D”).

  This is a heel base in which a 35 mm vertical hole is provided in a heel base having a height of 55 mm, a metal tube having an inner diameter of 3 mm is inserted into the heel base, and a lift projection fitting hole is molded with a resin constituting the heel base. A shoe heel was prepared by inserting into a table. The shoe heel was subjected to a lift slip resistance test based on SATRA PM144: 1999. At this time, the shoe heel was embedded in a tray with a wood alloy, and attached to a testing machine (SATRA Slip Resistance Tester STM603). The vertical load was 400 N, and a distance of 75 mm was slid at a speed of 100 mm / s. The coefficient of friction was measured for two shoe heels to evaluate slip resistance.

  The laboratory conditions are as follows.

Floor material: stainless steel, floor material condition: dry, shoe heel mounting angle: 15 °, test atmosphere; temperature 20 ± 1 ° C, relative humidity 65 ± 5% RH
As a result, the average friction coefficient was 0.325.

(Comparative Example 1)
In accordance with FIG. 4B, a lift having a diameter of 3 mm protruding from the lift by a length of 15.5 mm was created on a lift of 18 mm × 11 mm × 4.5 mm. The lift was molded from a polyurethane-based thermoplastic elastomer (manufactured by BASF, trade name “Elaston ET164D”: hardness JIS D 64 ± 3).

  A heel base having a height of 35 mm is provided in a heel base having a height of 55 mm, and a shoe heel is prepared by inserting it into a heel base in which a metal tube having an inner diameter of 3 mm is inserted. The coefficient of friction was measured to evaluate slip resistance.

  As a result, the average friction coefficient was 0.34.

(Example 2)
According to FIG. 4, the bottom of a pin with a diameter of 3 mm is supported on a lift of 18 mm × 11 mm × 4.5 mm with a convex portion with a bottom diameter of 6.5 mm, a height of 4.5 mm, and a top diameter of 4.5 mm. A lift having a pin projecting on the surface was prepared. The lift and the convex part were integrally formed with a polyurethane-based thermoplastic elastomer (manufactured by BASF, trade name “Elaston ET680”; hardness JIS A 80 ± 2).

  This was inserted into the same heel base as in Example 1 to prepare a shoe heel, and the coefficient of friction was measured in the same manner as in Example 1 to evaluate slip resistance.

  As a result, the average friction coefficient was 0.70.

(Comparative Example 2)
A lift in which a pin having a diameter of 3 mm protruded from the lift by a length of 15.5 mm was created on a lift of 18 mm × 11 mm × 4.5 mm. The lift was molded with a polyurethane-based thermoplastic elastomer (trade name “Elaston ET680” manufactured by BASF), which is a soft synthetic resin.

  This was inserted into the same heel base as in Comparative Example 1 to prepare a shoe heel, and the coefficient of friction was measured in the same manner as in Example 1 to evaluate slip resistance.

  As a result, the average coefficient of friction was 0.605, and one lifted off the heel base.

(result)
From the above Example 1 and Comparative Example 1, when the lift is prepared with high hardness Elaston ET164D, the friction coefficient is about the same regardless of whether or not the pin attached to the lift is supported by the convex portion. there were.

  On the other hand, when Example 1 was compared with Example 2, when a soft synthetic resin was used, the friction coefficient increased greatly from 0.325 to 0.70. However, as shown in Example 2, the lift is not detached from the heel base.

  On the other hand, as apparent from comparison between Example 2 and Comparative Example 2, when the lift is prepared with a soft synthetic resin, the lift of Comparative Example 2, which is a conventional mode, may come off the heel base. It was.

  According to the present invention, the lift can be prevented from being detached from the heel base by supporting the lift with the convex portion, and its manufacture can be easily prepared by integral molding, which is useful for manufacturing various shoes. is there.

It is a front view of the lift of the present invention, a heel base that can be inserted into the lift, and a front view of the shoe heel after both are inserted. It is the perspective view of the various lifts of this invention, and a top view. It is a front view which shows the conventional lift and heel base. It is a figure which shows the shoe heel manufactured by the Example and the comparative example.

Explanation of symbols

1 ... Lift body,
3 ... convex part,
5 ... pin 7 ... lift protrusion,
11 ... Heel base,
13 ... Lifting convex part fitting hole,
15 ... Vertical hole,
17... Lift projection fitting hole.

Claims (5)

  In the lift in which the mounting pin is insert-molded, the lower portion of the pin is supported by a convex portion provided on the lift body.   The lift according to claim 1, wherein the lift body has a protrusion for fitting with a heel around the pin.   The lift according to claim 1 or 2, wherein the lift body is made of a soft synthetic resin.   A shoe heel in which the lift according to any one of claims 1 to 3 is inserted into a heel base.   A shoe having the shoe heel according to claim 4.

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