JPH10248988A - Cap for ski - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase durability by arranging a reinforcing layer that is harder than a resin material comprising a ski cap integrally in an area near a screw insertion hole. SOLUTION: For instance, a ski cap 1 is formed integrally of a polyamide resin elastomer whose Shore D hardness is about 62, nearly in triangular form as viewed from top. A head insertion section for a ski 8 is formed inward from the rear end. Screw insertion holes 6a, 6b are made in a top wall 4 and a bottom wall 5 in positions about 15mm from the rear end toward the head of the ski cap 1. Concentric reinforcing layers 7 around the screw insertion holes 6a, 6b are arranged in the surrounding of the insides of the screw insertion holes 6a, 6b that contact a ski 8. The reinforcing layers 7 are formed of a material harder than the component material of the ski cap 1, a polyacetal resin whose Shore D hardness is about 75 for example. The increased rigidity of the surrounding areas of the screw insertion holes 6a, 6b protects the ski against deformation and cracking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a ski cap mounted on the tip of a ski.

[0002]

2. Description of the Related Art Conventionally, a ski cap 21 made of a synthetic resin as shown in FIG. Usually, the ski cap 21 is formed of a resin material having excellent low-temperature impact properties such as polyamide resin, urethane resin, and ionomer resin. The ski cap itself has a buffering effect, thereby providing safety against impact. Is increasing. The general shape of the ski cap 21 is, as shown in FIG. 5, a planar shape substantially triangular along the shape of the tip of the ski, and a rear end 22. Has a configuration in which a ski tip insertion portion 23 into which the tip of a ski is inserted is provided.

Conventionally, when the ski cap 21 having the above structure is fitted to the tip of the ski 28, the ski cap 21 and the ski 28 are fixed by bonding, fitting, or the like. Alternatively, it is performed by a method such as screwing. As a structure of a general ski cap 21 which is fixed with a screw in the fixing method, as shown in FIG. 6, the ski cap 21 is formed on the top wall 24 and the bottom wall 25 of the ski cap 21. Screw insertion holes 26a, 2
6b and the screw insertion hole 26 at the tip of the ski 28
a, screw insertion hole 26 formed at a position corresponding to a, 26b
A configuration is known in which a fixing screw 29 is inserted through c, and the fixing screw 29 is fastened and fixed with a nut 30.

[0004]

However, these conventionally known ski caps which are fixed to a ski by screwing have the following problems. That is, since the ski cap 21 having the above configuration is fixed to the ski plate 28 with only one or two fixing screws 29, the stress applied to the ski cap 21 during skiing is the same as that of the above. Screw insertion hole 26 of ski cap into which fixing screw 29 is inserted
Only the peripheral areas of a and 26b are assigned.

However, the screw insertion holes 26a, 26b
Is usually pierced in the thin-walled area of the upper surface wall 24 and the lower surface wall 25 of the ski cap 21 where the ski tip insertion portion 23 is provided. Is molded from a soft resin material, it does not have the strength and rigidity necessary to hold the fixing screws 29 and nuts 30 made of a relatively rigid material such as metal, For this reason, there has been a problem that, over a long period of time, the peripheral areas of the screw insertion holes 26a and 26b are broken or deformed, causing adverse effects such as rattling of the fixing screws 29 and noise. .

In view of the above-mentioned disadvantages of the prior art, the present invention is to improve the strength and rigidity of a region around a screw insertion hole of a ski cap attached to a tip end of a ski by screwing. It is another object of the present invention to provide a ski cap having excellent durability without the peripheral area of the screw insertion hole being damaged even when the ski cap is repeatedly subjected to an impact.

[0007]

In order to achieve the above object, the present invention has the following arrangement. That is, the present invention relates to a ski cap made of a soft synthetic resin which is externally fitted to a tip portion of a ski and is attached to the ski with fixing screws, wherein a top wall and a bottom wall of the ski cap are provided. A screw insertion hole through which the fixing screw is inserted is formed, and a reinforcing layer harder than a resin material constituting the ski cap is integrally provided in a peripheral region of the screw insertion hole. The ski cap is characterized in that

The reinforcing layer is provided at least in a range of at least 1.5 mm around the screw insertion hole in order to prevent breakage or deformation of the screw insertion hole peripheral region around the screw insertion hole. It is desirable to be done. On the other hand, if the arrangement range is too large, the rigidity of the reinforcing layer causes the elasticity of the ski cap itself to decrease, which causes a problem of impairing the cushioning effect.
It is preferable that the reinforcing layer is provided in the vicinity of the rear end of the ski cap, and in this case, the arrangement range of the reinforcing layer is about 1/3 of the total length from the rear end of the ski cap to the front end. It is desirable to be provided.

The material of the ski cap of the present invention is preferably formed of a relatively elastic soft resin material capable of effectively absorbing and mitigating the impact of skiing. For example, Shore D hardness 50-65
It is desirable to be molded from a thermoplastic resin elastomer such as polyamide resin, urethane resin and ionomer resin. Further, the material constituting the reinforcing layer disposed in the peripheral region of the screw insertion hole is made of a material harder than the resin material constituting the ski cap, and at least, in the peripheral region of the screw insertion hole. Due to the applied stress, the peripheral area of the screw insertion hole has an appropriate hardness that does not cause breakage such as cracking or deformation, and is formed from a material having good adhesiveness with a resin material for molding the ski cap. It is desirable to be done. As the material constituting the reinforcing layer, for example, general-purpose plastic materials such as polyacetal resin and polycarbonate resin having a Shore D hardness of 70 to 85 degrees, or fiber-reinforced plastics can be suitably used.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to preferred embodiments described in detail with reference to the drawings. FIG. 1 is an explanatory view showing the entire ski cap of the present embodiment, and FIG.
FIG. 3 is a sectional explanatory view showing a state in which the ski cap of this embodiment is externally fitted to the tip of the ski and attached with fixing screws. As shown in FIG. 1 and FIG. 2, the ski cap 1 of the present embodiment integrally formed of a polyamide resin elastomer having a Shore D hardness of 62 degrees has a substantially triangular shape when viewed from a plane. A ski tip insertion portion 3 into which the tip of the ski is inserted inward from the rear end 2 is provided. On the top wall 4 and the bottom wall 5 at a position of about 15 mm from the rear end 2 to the tip of the ski cap 1, two screw insertion holes 6 having a diameter of about 4 mm are formed. Around the inner surface of the screw insertion hole 6 which is in contact with the ski, a reinforcement made of a polyacetal resin having a diameter of about 12 mm, a thickness of about 1.5 mm, and a Shore D hardness of 75 degrees centering on the screw insertion hole 6 is provided. It has a configuration in which the layer 7 is provided.

Accordingly, as shown in FIG. 3, when the ski cap 1 of the present embodiment is externally fitted to and fixed to the tip of the ski 8, the upper and lower walls 4, 5 and 5 of the ski cap 1 are provided. The fixing screws 9 are inserted into the screw insertion holes 6a and 6b formed at the positions corresponding to the screw insertion holes 6a and 6b of the ski 8 and fixed by the nut 10. However, since the reinforcing layer 7 is interposed in the area around the screw insertion holes 6a and 6b of the ski cap 1 into which the fixing screws 9 are inserted, the screw insertion holes 6a and The rigidity of the peripheral region of the ski 6b is improved, so that damage such as cracking or deformation of the screw insertion holes 6a and 6b due to repeated external force applied to the ski cap 1 during skiing can be prevented. Area where no It is never such buffering effect of the ski cap 1 itself is impaired because it has a moderate elasticity.

To form the ski cap 1 of the present embodiment, the ski cap 1 is integrally formed by an injection molding method using a molding die 11 as shown in FIG. The molding die 11 comprises an upper die 11a having a ski cap-shaped cavity, a lower die 11b, and a core 11c for forming the ski tip insertion portion 3. Pins 11 for forming screw insertion holes 6 are formed in the inner surfaces of the cavities of the mold 11a and the lower mold 11b.
d are projected from each other. First, the reinforcing layer 7 is separately molded in advance, and the reinforcing layer 7 is inserted into a pin 11d projecting from the inner surface of the cavity of the upper mold 11a and the lower mold 11b, and temporarily fixed. The upper mold 11a, the lower mold 11b, and the core 11c are clamped to form the upper mold 1
1a, the end face of the pin 11d of the lower mold 11b, and one side face of the reinforcing layer 7 inserted through the pin 11d are the core 1
1c is disposed in close contact with the top and bottom surfaces. Thereafter, the polyamide resin for molding the cap for a ski, which is heated and melted, is injected and injected into the cavity of the cavity from the resin injection port 12 of the molding die 11 by an injection molding machine, and then cooled and cured. Thus, the ski cap 1 of the present embodiment is formed.

The form of the reinforcing layer 7 that can be applied to the ski cap 1 of the present invention can be any shape such as a circle, an ellipse, a triangle, and a rectangle that can be arranged so as to surround the peripheral area of the screw insertion hole 6. Can be formed into a shape,
The size to be provided varies depending on the rigidity and strength of the material of the reinforcing layer 7 to be used. However, in order to prevent breakage of the peripheral area of the screw insertion hole 6 and damage such as deformation, at least the size It is desirable that it is formed in a size that can be arranged around the screw insertion hole 6 in a range of 1.5 mm or more, and it is desirable that the thickness is 1 mm or more. The reinforcing layer 7
In addition to the above-described embodiment, the location may be arranged on the outer surface side of the upper surface wall 4 and the bottom surface wall 5, or may be arranged on both the inner surface side and the outer surface side.

The reinforcing layer 7 is preferably provided in the vicinity of the rear end 2 of the ski cap 1 together with the screw insertion hole 6 in order to prevent the buffering effect of the ski cap body from being impaired. In this case, the arrangement range of the reinforcing layer 7 is about one full length from the rear end 2 of the ski cap 1.
It is desirable to provide in an area up to about / 3. When the reinforcing layer 9 is provided over an area that is at least 1/3 of the entire length from the rear end portion 2 of the ski cap 1, the elasticity of the ski cap body formed of a soft resin material is improved. The area becomes narrow, and the impact applied from the tip end side of the ski cap 1 cannot be effectively absorbed and alleviated, which is not desirable.

[0015]

As described above, the ski cap of the present invention has a structure in which a reinforcing layer made of a hard material is integrally disposed in a peripheral region of a screw insertion hole provided in the ski cap. Therefore, since the strength and rigidity of the peripheral area of the screw insertion hole can be improved, breakage such as cracking or deformation of the part when an impact is applied can be prevented, and the durability of the ski cap can be improved. Can be. Further, the reinforcing layer is disposed only in a region around the screw insertion hole of the ski cap, and in a region where the reinforcing layer is not disposed, the reinforcing layer has an appropriate elasticity, thereby impairing the buffering effect of the ski cap itself. Never.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the entire ski cap of the present embodiment.

FIG. 2 is an explanatory sectional view taken along line A-A ′ of FIG. 1;

FIG. 3 is an explanatory sectional view showing a state in which the ski cap according to the present embodiment is externally fitted to the tip of a ski and attached with fixing screws.

FIG. 4 is an explanatory view showing a method of forming the ski cap of the present embodiment.

FIG. 5 is an explanatory view showing the entire conventional ski cap.

FIG. 6 is an explanatory sectional view of a conventional ski cap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ski cap 2 Rear end 3 Ski tip insertion part 4 Top wall 5 Bottom wall 6 Screw insertion hole 6a Screw insertion hole 6b Screw insertion hole 6c Screw insertion hole 7 Reinforcement layer 8 Ski plate 9 Fixing screw 10 Nut 11 Molding Mold 11a Upper die 11b Lower die 11c Core 11d Pin 12 Resin injection port 21 Ski cap 22 Rear end 23 Ski tip insertion part 24 Top wall 25 Bottom wall 26a Screw insertion hole 26b Screw insertion hole 26c Screw insertion hole 28 Ski Plate 29 Fixing screw 30 Nut

Claims (3)

[Claims] 1. A ski cap made of a soft synthetic resin which is externally fitted to a tip portion of a ski and is attached to the ski by fixing screws, wherein a top wall and a bottom wall of the ski cap have: A screw insertion hole through which the fixing screw is inserted is formed, and in a peripheral region of the screw insertion hole,
A ski cap, wherein a reinforcing layer harder than a resin material constituting the ski cap is provided integrally. 2. The ski cap according to claim 1, wherein the ski cap is made of a thermoplastic resin elastomer such as a polyamide resin, a urethane resin, and an ionomer resin. 3. The ski cap according to claim 1, wherein the reinforcing layer is made of a resin material such as a polyacetal resin or a polycarbonate resin, or a fiber reinforced plastic.