JP4688010B2 - Footwear for footwear and footwear using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tip used for protecting a fingertip portion by attaching it to a footwear toe portion such as a shoe, a boot, and a basement, and footwear using the same.
[0002]
[Prior art]
Work shoes called safety boots and safety boots, or some footwear such as basements are equipped with a metal tip to protect the toes from falling objects It has been.
However, since the tip used conventionally has been focused on covering the fingertip portion, it is not always in a shape that easily resists an external force caused by a fallen object or the like.
[0003]
Incidentally, the tip 100 shown in FIG. 14 is an example, and the tip 100 as a whole covers the toe portion of the foot. The top 101 is curved upward, the leading end connected to this, and the rising portions 102, 103, 103 on both sides. Thus, the whole is formed in a curved surface so as to have a substantially semi-dome shape, and a flange portion 104 is connected to the lower end.
[0004]
When a force is applied to the tip 100 by the object X from above as shown in FIG. 15, the tip 100 is deformed from the top to the rising part, and further, stress concentrates on a specific part to cause destruction. It will happen that the purpose of the period is not fully achieved.
That is, when the tip 100 is placed on a flat surface as shown in FIG. 15A and a force is applied by the object X having a flat lower end, the top portion 101 is first crushed and flattened as shown in FIG. 15B. Begin to become. At this time, since the top portion 101 of the curved cross section becomes flat, the material of the top portion 101 tends to extend to the outside. However, a force against this works due to the presence of the surrounding rising portion and flange portion. The part becomes a dent of the top part 101, and the rest is used for the rising parts 103, 103 on both sides to fall outward. When further force is applied, as shown in FIG. 15 (C), the rising portions 103 and 103 fall sharply, the curvature of the bent portion 105 is reduced, and this portion is bent and broken. The crack will be destroyed. In this case, the tip core 100 is concentrated by the external force applied to the fractured portion, and becomes the limit of the resistance force.
When this state is seen in the cross-sectional view in the horizontal direction of FIG. 15D, the tip portion of the lead core 100 is strong because the three directions are rising portions, but the rising portions 103 and 103 on both sides are outward. The top 101 of the opening at the rear end is pushed down from the position indicated by the arrow Y, and the desired space cannot be maintained.
[0005]
[Problems to be solved by the invention]
In order to prevent the strength reduction and deformation of the tip as described above, it has been conventionally necessary to increase the overall thickness or select a material with higher strength, but this increases the weight of the tip. However, there is a problem that the molding process becomes difficult, or the material cost increases and the cost increases.
Therefore, the present inventor has formed a shape that covers the fingertip without specially increasing the thickness while taking advantage of the characteristics of the synthetic resin material, and suppresses deformation due to external force as much as possible, and at the flange at the lower end of the rising portion Accordingly, the present invention aims to provide a lightweight footwear with high performance and a footwear using the same by reducing the bending moment caused by the portion to improve the strength.
[0006]
That is, the present invention has been made to solve the above-mentioned problems, and the gist thereof is a synthetic resin tip that is formed in a shape covering the fingertip portion, and includes a top portion, a surrounding rising portion, both It consists of a shoulder part connecting the parts and a flange part at the lower end, and when deformed by the force applied to the top part, the top part, the rising part and the flange part have a substantially rectangular cross section, and the surrounding rising part is substantially the same. And the flange portion is provided on both sides of the rising portion so as to extend in substantially the same width so as to have an inverted T shape. It is in.
In addition, the gist of the present invention is a footwear in which the tip for footwear molded as described above is attached to the fingertip portion.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings showing the embodiments.
FIGS. 1 to 6 show a first embodiment of the present invention, in which FIG. 1 is a perspective view of the footwear core of the present invention as seen from the rear opening side, and FIG. 2 is from the same direction. FIG.
In the figure, 1 is a top part, and its cross section is slightly curved upward or is formed in a substantially straight shape so as to substantially cover the top of the toe part, 2 is a rising part at the tip, and 3 and 3 are on both sides. The rising portion surrounds the periphery of the toe portion by these rising portions 2, 3 and 3, and covers the fingertips by these. Reference numeral 4 denotes a shoulder portion connecting the top portion 1 and the rising portions 2, 3, 3, and this tip can receive the force applied to the top portion 1 substantially uniformly at the surrounding rising portions 2, 3, 3. It is like that. In this example, the rising portion 2 at the tip is substantially vertical, and the rising portions 3 and 3 on both sides are formed so as to be inclined upward and slightly inward. This inclination angle is determined by taking into account the degree of curvature of the top portion 1 and increasing the inclination angle if the curvature is large, and making it substantially vertical if the top portion 1 becomes flat.
In the figure, reference numeral 5 denotes a flange portion provided at the lower ends of the rising portions 2, 3 and 3, which is formed on both sides of the rising portions 2, 3 and 3 so as to extend in substantially the same width and to have an inverted T shape. Reference numeral 6 denotes a rear opening. And the fillet part F which has a small curvature in the inner surface is provided in this shoulder 4 inner corner and flange 5 corner.
[0008]
A state in which a vertical load is applied to the tip from above will be described in the same manner as in FIG. 15 described above, but FIGS. 3A, 4A, and 5A show the tip. 3 (B), FIG. 4 (B), and FIG. 5 (C) are cross-sectional views as viewed from a direction perpendicular to this.
As shown in FIG. 3, the tip is placed on a flat surface and a vertical load is applied to the object X from above, but the tip of the present invention has a rising portion 3 on both sides as shown in FIG. The cross section 3 is substantially linear, and is slightly inclined upward according to the curvature of the top portion 1, and the rising portion 2 at the tip is substantially vertical as shown in FIG.
[0009]
FIG. 4 shows a state in which the tip core is deformed by a vertical load, and the top portion 1 is in contact with the object X. The curvature of the top portion 1 is flattened, the rising portion 3 stands upright, and the flange portion at the lower end. 5 also forms a right angle and touches a flat surface. With such rising portion becomes perpendicular shape, exhibits and a flange portion 5 which became a top 1 which is substantially flat and at right angles shape as shown in FIG. 4 the substantially rectangular cross-section, thereby uniformly load It can be received.
As a result, the top portion 1 and the flange portion 5 of the rising portions 2 and 3 are not broken, receive a vertical force, eliminate stress concentration due to the occurrence of cracks, and maximize the compression of the rising portions 2 and 3. Stress will be exhibited. In particular, in this example, since the fillet portion F is formed at the inner corner of the top portion 1 and the inner corner of the flange portion 5, bending stress is not concentrated at this portion, and a more preferable result is obtained.
[0010]
FIG. 4 for explaining the present embodiment shows a state corresponding to FIGS. 15B and 15C, but in the case of the present invention, it is not subject to the deformation as shown in FIG. As described above, the tip has undergone deformation as shown in FIG. 4 and has a substantially rectangular cross section so that the load can be received substantially uniformly. When the load is further applied and the state shown in FIG. 5 is reached, the rising portions 2, 3, 3 bulge outward and buckle. At this stage, the load applied to the tip is received by the rising parts 2, 3 and 3 as a whole, so that the rear end opening 6 side is not deformed as in the conventional product, and is the same. Compared to the thickness and the tip of the same material, the strength can be further greatly increased.
[0011]
The tip of the present invention is configured to exhibit the desired effect by the action as described above. However, this is because the tip is placed on the bottom of the footwear having relatively low hardness such as leather. Although it matches well in the case of the placed state, the phenomenon will be different when the tip is mounted on the insole or insole surface made of a flexible material such as rubber or synthetic resin .
This will be described with reference to FIG. 6. When the tip is subjected to a vertical load by the object X as shown in FIG. 4, the flange portion of the tip falls into the flexible bottom material as shown in FIG. 6B. Although a phenomenon occurs, this may reduce the height H at which the foot enters even if the tip is not deformed.
[0012]
In the meantime, as shown in FIG. 6C, a general tip has a flange portion bent inward by a predetermined width W, so that the length l of the flange portion is counteracted from the bottom portion by a sinking phenomenon. As a result, a large moment M is generated at the rising portion. When a vertical load from the object X is applied in this state, the rising portion buckles with a significantly smaller vertical load than when there is no sinking. In order to avoid this, it is conceivable that the length of the flange portion is shortened or eliminated. However, this increases the pressure on the bottom surface, which may severely cut the bottom material by the tip.
[0013]
In order to avoid this, in the present invention, as shown in FIG. 6 (A), the total width of the flange portion 5 is the same as that in FIG. 6 (C). The flange portion 5 is provided so as to extend in substantially the same width and to have an inverted T shape in this portion.
As a result, the bending moment m applied to the flange portion 5 is remarkably small because the length l ′ is short, and since both sides are substantially the same width, the bending moment is canceled and hardly occurs, and the original high buckling fracture stress is obtained. It can be demonstrated.
[0014]
Next, a second embodiment of the present invention will be described with reference to FIGS. 7 to 11. Of these, FIG. 7 is a perspective view of the footwear core of the present invention as seen from the rear opening side, FIG. 2 is a rear view seen from the same direction.
In the figure, 1 is a top part, and its cross section is slightly curved upward or is formed in a substantially straight shape so as to substantially cover the top of the toe part, 2 is a rising part at the tip, and 3 and 3 are on both sides. At the rising portion, the rising portions 2, 3, and 3 surround the toe portion and cover the fingertip as a whole. Reference numeral 4 denotes a shoulder portion connecting the top portion 1 and the rising portions 2, 3, 3, and this tip can receive the force applied to the top portion 1 substantially uniformly at the surrounding rising portions 2, 3, 3. It is like that. The rising portions 2, 3, and 3 at this time are formed so that the rising portion 2 at the tip is substantially vertical, and the rising portions 3, 3 on both sides are inclined upward and slightly inward, as in the first embodiment. ing.
Also in this example, the lower ends of the rising portions 2, 3, 3 are provided so as to extend to both sides and have an inverted T shape. Furthermore, in this example, the shoulder portion 4 is provided with a collar portion D that slightly protrudes outward, so that the stress concentration of the shoulder portion 4 is relieved. In addition, F is a fillet part provided in the shoulder part 4 inner corner and the flange part 5 inner corner.
[0015]
In the present embodiment, such a lead core is a flat and narrow upper portion connected to the shoulder portion 4 in at least a part of the configuration from the shoulder portion 4 to the rising portions 2, 3, 3. Although the pressure receiving surface 7 is formed, in this example, the upper pressure receiving surface 7 is formed along the entire circumference of the rising portions 2, 3, 3. Further, in this example, the shoulder portion 4 and the flange portion 5 are formed substantially perpendicular to the rising portions 2, 3, 3.
In this example, the upper pressure-receiving surface 7 is provided on the entire circumference of the rising portions 2, 3, 3, but this configuration is effective even if it is provided at least at a required portion, and is particularly deformed with respect to the load. It can also be formed only at locations that are susceptible to, for example, the rising portions 3 and 3 that are close to both sides of the opening 6.
[0016]
A state in which a vertical load is applied to the tip from above will be described in the same manner as in the above-described drawings. FIGS. 9A and 10A show the tip from the opening 6 side. FIGS. 9B and 10B are cross-sectional views seen from a direction perpendicular thereto, and FIG. 11 is a partially enlarged cross-sectional view of FIG. 10A.
As shown in FIG. 9, the tip is placed on a flat surface and a vertical load is applied to the object X from above, or the tip of the present invention is as shown in FIG. The cross section 3 is substantially linear, and is slightly inclined upward according to the curvature of the top portion 1, and the rising portion 2 at the tip is substantially vertical as shown in FIG.
[0017]
FIG. 10 shows a state in which the deformation of the tip due to the vertical load has progressed, and the upper pressure-receiving surface 5 is in contact with the object X, the curvature of the top 1 is flattened, the rising portion 3 stands upright, The flange portion 5 is also perpendicular to the flat surface. When the rising portions 2, 3, 3 are thus vertical, the flange portion 5, which is perpendicular to the upper pressure-receiving surface 7, becomes the lower pressure-receiving surface as shown in FIG. The load can be received uniformly. At the same time, since the bending stress generated in the shoulder portion described above is generated exclusively in the connecting portion R inside thereof, the influence on the upper end of the shoulder portion 4 and the rising portion 3 can be reduced, and the flange at the lower end can be reduced. Since the portion 5 is also in a vertical shape and touches, the surface pressure is not increased.
As a result, the upper pressure-receiving surface 7 and the flange portion 5 of the rising portions 2, 3, 3 are not broken, receive a vertical force, and no stress concentration occurs due to the occurrence of cracks, and the rising portions 2, 3, 3. The maximum compressive stress inherent to the original will be exhibited. In particular, in this example, the fillet portion F is formed at the inner corner of the flange portion 6 and the upper corner of the upper pressure-receiving surface 7, and the flange portion D is formed at the shoulder portion 4. Therefore, bending stress at this portion may be concentrated. And more favorable results are obtained. Therefore, it is possible to obtain a tip having a higher strength that does not cause compressive fracture like the tip proposed by the above-described proposal.
[0018]
FIGS. 9 and 10 for explaining the present embodiment show the states corresponding to FIGS. 15B and 15C. In the case of the present invention, FIG. As shown in FIG. 5, the lead core is deformed and has a substantially rectangular cross section so that the load can be received substantially uniformly. When the load is further applied and the state shown in FIG. 6 is reached, the rising portions 2, 3, 3 bulge outward and buckle. At this stage, the load applied to the tip is received by the rising parts 2, 3 and 3 as a whole, so that the rear end opening 8 side is not deformed as in the conventional product, and is the same. Compared to the thickness and the tip of the same material, the strength can be further greatly increased.
[0019]
Also in the case of the second embodiment, the flanges are provided on both sides of the rising portions 2, 3, 3 so as to extend in substantially the same width and have an inverted T shape, so that they are mounted on the surface of the flexible bottom material. Even if it is placed and mounted, it can be excellent in that it exhibits a high buckling fracture stress with almost no bending moment.
[0020]
12 and 13 are cross-sectional views of the fingertip portion showing an embodiment of the footwear of the present invention in which the tip core configured as described above is mounted.
In the example of FIG. 12, S is the tip of the second embodiment of the present invention, 8 is the upper fabric made of cloth, leather, artificial leather, etc., and the tip S is sandwiched between this and the interior material 9. The footwear bottom has a structure in which a relatively flexible insole 11 is laminated on the inside of the outsole 10 having a relatively high hardness, and the tip of the present invention is placed on the insole 11. The flange portion is mounted and mounted. In the figure, 12 is an insole material, and 13 is a cushioning material.
[0021]
In the above example, since the tip S of the present invention is placed on the relatively flexible insole 11, even when a vertical load is applied to the tip as described above, the flange portion 5 sinks. The resulting bending moment can be made extremely small, so that buckling fracture stress can also be exerted in addition to improving the original strength, and it is possible to provide footwear that is light and has high fingertip safety. [0022]
FIG. 13 shows another embodiment of the footwear of the present invention, which is substantially the same except that the structure of the footwear bottom is slightly different from the case of FIG. As described above, the leading end S of the present invention is formed so that the rising portions 2, 3, 3 extend at substantially the same width on both sides to have an inverted T shape, and therefore, on the flexible insole 11. Even if it is placed on the surface, an excellent effect is exhibited, but it can be said that it is more advantageous to place it substantially on the bottom surface having a relatively high hardness. That is, as shown in the figure, the tip S is mounted in a state where the flange portion is substantially placed on the bottom 10 having relatively high hardness. Here, “substantially placed” means a state in which a material that does not exhibit flexibility, such as a thin reinforcing cloth, is provided directly on the bottom 10 or on the surface thereof, and the hardness of the bottom 10 is defined as the flange portion. It means the state that will receive.
Of course, the rubber and the synthetic resin material used for the bottom 10 also have a certain degree of flexibility, so when a vertical load is applied to the tip, a slight sinking phenomenon may be unavoidable. In this case, the effect of the lead of the present invention is utilized.
[0023]
Since the tip of the present invention is formed of a synthetic resin, the structure unique to the present invention can be easily molded as designed, and the weight is greatly reduced compared to a metal tip that is generally used. In addition, when worn on footwear, it hardly affects the balance of the footwear, which is preferable from the viewpoint of comfort. As this synthetic resin material, thermoplastic resins such as nylon and polycarbonate, other thermosetting synthetic resins, or so-called FRP reinforced with reinforcing fibers such as glass fibers and carbon fibers can be used. Among these, FRP in which reinforcing fibers such as glass fibers are mixed with thermoplastic resins such as nylon and polypropylene is particularly suitable.
[0024]
In addition, since the structure of the tip of the present invention has a function of receiving the load applied to the top portion 1 at the surrounding rising portions 2, 3, 3 as much as possible and exerting the strength, the rising portions 2, 3, 3, etc. It is desirable to increase the strength. From this point of view, it is one effective means to make the rising portions 2, 3, and 3 thicker than other portions.
Note that, as described in the example shown in FIG. 7, if a slight flange D is formed on the outer side of the upper pressure receiving surface 7, the pressure applied to the upper pressure receiving surface 7 can be reduced, which is effective. is there.
[0025]
In the embodiment of the present invention, the flange portion 5 and the upper pressure-receiving surface 7 are preferably formed in a right angle with respect to the rising portions 2, 3, and 3, and when a load is applied to the top portion 1, the flange portion 5 The upper pressure-receiving surface 7 is orthogonal and the rising portions 2, 3, and 3 are vertical, but this angle is not necessarily limited to a right angle. A close effect is obtained. Further, even if only the flange portion 5 or only the upper pressure-receiving surface 7 is formed in a substantially right-angle shape, it is possible to expect the effect of that amount and is effective.
[0026]
Further, in the above embodiment, the fillet portion F having a small curvature on the inner surface is formed at the inner corner of the shoulder portion 4 and the flange portion 6, which is effective in eliminating stress concentration. The fillet portion F may be formed only at the inner corner of the shoulder portion 4 or only at the inner corner of the flange portion 5 to improve the stress concentration at that portion.
[0027]
【The invention's effect】
Since the present invention is configured as described in detail above, when a load is applied to the tip, the top, the rising portion and the flange portion have a substantially rectangular cross section, and are substantially uniform over the entire rising portion. It can be received in a well-balanced manner and exert its strength, and in particular, it can prevent deformation due to the drop of the rear end of the tip, and even when the tip is attached using a flexible bottom material The buckling fracture stress can be increased by generating almost no bending moment due to the sinking of the flange, and it can be easily obtained by using a synthetic resin material. Further, there is an advantage that it is possible to provide a footwear for footwear that can also contribute to footwear and footwear using the same.
[Brief description of the drawings]
FIG. 1 is a perspective view seen from the opening side of a footwear tip for a first embodiment of the present invention.
2 is a rear view as seen from the opening side of the tip of FIG. 1. FIG.
3A and 3B are explanatory views showing a state where an external force is applied to the tip of the present invention, in which FIG. 3A is a rear view as viewed from the opening end side, and FIG. 3B is from a side orthogonal thereto. FIG. 4 is an explanatory view showing a state in which an external force is applied to the tip of the present invention, FIG. 4 (A) is a rear view seen from the opening end side, and FIG. 4 (B) is this. It is sectional drawing seen from the orthogonal side.
5A and 5B are explanatory views showing a state in which buckling is caused by applying an external force to the tip of the present invention, FIG. 5A is a cross-sectional view seen from the opening end side, and FIG. 5B is orthogonal thereto. It is sectional drawing seen from the side.
6 is a partial sectional view showing a state of a rising portion when a force is applied to the tip of the present invention. FIG. 6 (A) is an example of the present invention, and FIG. 6 (B) and FIG. ) Is a diagram of a conventional example.
FIG. 7 is a perspective view seen from the opening side of a footwear tip according to a second embodiment of the present invention.
8 is a rear view as seen from the opening side of the tip of FIG. 7. FIG.
FIG. 9 is an explanatory view showing a state in which an external force is applied to the tip of the present invention, FIG. 9 (A) is a rear view as viewed from the opening end side, and FIG. 9 (B) is from a side orthogonal thereto. FIG .
FIG. 10 is an explanatory view showing a state in which an external force is applied to the tip of the present invention, FIG. 10 (A) is a rear view seen from the opening side, and FIG. 10 (B) is seen from a side orthogonal thereto. It is sectional drawing.
11 is an enlarged partial cross-sectional view of a part of FIG.
FIG. 12 is a partial cross-sectional view showing a footwear equipped with a tip of the present invention.
FIG. 13 is a partial cross-sectional view showing another example of footwear to which the tip of the present invention is attached.
FIG. 14 is a perspective view showing a conventional tip.
15 is an explanatory view showing a state where an external force is applied to a conventional tip, FIG. 15 (A) is a rear view showing a state where an external force is about to be applied, and FIG. 15 (B) is an external force. FIG. 15C is a rear view similar to the state in which the external force is further applied to cause a partial destruction, and FIG. 15D is orthogonal to the state of FIG. 15C. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Top part 2 (Rear end) rising part 3, 3 (Both side) rising part 4 Shoulder part 5 Flange part 6 Opening part 7 Upper pressure-receiving surface F Fillet part

Claims (9)

A synthetic resin tip that is shaped to cover the fingertip, and consists of a top, a surrounding riser, a shoulder connecting the two parts, and a flange at the lower end, and is deformed by the force applied to the top. The top part, the rising part and the flange part have a substantially rectangular cross section so that the surrounding rising part can be received substantially uniformly, and the flange part is provided on both sides of the rising part. A tip for footwear characterized by being provided with an approximately T-width and an inverted T-shape. The flat and narrow upper pressure-receiving surface connected to the rising portion is formed on the shoulder portion in at least a part of the configuration from the shoulder portion to the rising portion of the tip. Toe for footwear. The footwear lead according to claim 2, wherein the upper pressure-receiving surface is formed at least at the rising portions on both sides. The tip for footwear according to claim 2, wherein the upper pressure-receiving surface is formed all around the rising portion. 5. The toe for footwear according to claim 1, wherein the shoulder portion and / or the flange portion on which the upper pressure-receiving surface is formed are formed substantially perpendicular to the rising portion. The tip for footwear according to claim 1, wherein a fillet portion is formed at an inner corner of the upper pressure receiving surface and / or an inner corner of the flange portion. The tip for footwear according to claim 1, wherein the tip is formed of FRP. A footwear comprising the footwear tip according to any one of claims 1 to 7 attached to a footwear portion. The footwear according to claim 8, wherein the tip core flange portion is mounted in a state of being substantially placed on the bottom of the footwear fingertip portion.

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