Hat body, helmet

Abstract

To provide a hat body and a helmet having high shock absorption properties.SOLUTION: A hat body 10 is a resin component used in a helmet 1, and includes a main body 11 that covers and protects a wearer's head, and a shock absorbing structure 12 that has an uneven shape on at least a portion of an outer surface or inner surface of the main body 11 and absorbs a shock applied from outside the hat body 10. The shock absorbing structure 12 may have a shape in which a plurality of thin plate-like protruding ribs 121 are arranged. The shock absorbing structure 12 may be formed on a top of the head.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a hat body and a helmet. [Background technology]

[0002] Conventionally, various developments have been made regarding the safety and comfort of helmets when worn (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-311713 Summary of the Invention [Problem to be solved by the invention]

[0004] A helmet generally comprises a resin shell, an impact absorbing liner attached to the inside of the shell, and a garment such as a loop, hammock, or headband attached to the inside of the liner, as well as a chin strap, etc.

[0005] Most shock absorbing liners are made of polystyrene foam, which has poor breathability and causes problems such as stuffiness when worn. However, if the polystyrene foam liner is removed, the helmet does not have sufficient shock absorption and the safety of the helmet is reduced. In addition, if the thickness is increased to increase the strength of the hat body, the weight of the entire helmet increases, which is not desirable.

[0006] An object of the present invention is to provide a hat body and a helmet having high impact absorption properties. [Means for solving the problem]

[0007] The present invention solves the above problems by the following solving means. (1) The cap body of the present invention is a resin cap body used in a helmet, and comprises a main body that covers and protects the wearer's head, and an impact absorbing structure that is molded integrally with the main body on at least a part of the outer surface or inner surface of the main body, has an uneven shape, and absorbs impacts applied to the cap body from the outside.

[0008] (2) A hat body as described in (1), wherein the impact absorbing structure is formed on at least the outer surface or inner surface of the main body, in an area that covers the top of the wearer's head.

[0009] (3) A hat body as described in (1) or (2), in which the impact absorbing structure has a plurality of thin protruding ribs arranged along the inner surface of the main body, and the ribs form a honeycomb structure.

[0010] (4) A hat body as described in (1) or (2), in which the impact absorbing structure has a plurality of thin plate-like protruding ribs arranged along the inner surface of the main body, and a plurality of compartments that become recesses are formed by the ribs.

[0011] (5) A hat body as described in (1) or (2), wherein the impact absorbing structure has a plurality of grooves arranged along the outer surface of the main body, and a strip-like convex portion is formed between adjacent grooves.

[0012] (6) A hat body as described in (1) or (2), in which the impact absorbing structure has a plurality of polygonal faces arranged adjacent to each other on the outer surface of the main body, and the faces are inclined relative to each other.

[0013] (7) A hat body as described in (1) or (2), in which the impact absorbing structure is formed by arranging a plurality of unit shapes, each of which is polygonal and has a protruding center, at predetermined intervals on the outer surface of the main body.

[0014] (8) The helmet of the present invention comprises a hat body described in any one of (1) to (7), a wearing body including a loop string, a hammock, and a headband arranged on the inside of the hat body, and a chin strap connected to the headband and placed around the wearer's chin. Effect of the Invention

[0015] According to the present invention, it is possible to provide a hat body and a helmet having high impact absorption properties. [Brief description of the drawings]

[0016] [Figure 1] 1A and 1B are diagrams illustrating a helmet 1 according to an embodiment. [Diagram 2] 1 is a perspective view showing the inside of a cap body 10 according to an embodiment. [Diagram 3] 1A to 1C are diagrams illustrating a shock absorbing structure 12 (embodiment 1) of an embodiment. [Figure 4] 13 is a diagram showing another embodiment (embodiment 2) of the shock absorbing structure 12. FIG. [Diagram 5] 5 is an enlarged view of a part of the shock absorbing structure 12 shown in FIG. [Figure 6] 13 is a diagram showing another embodiment (embodiment 3) of the shock absorbing structure 12. FIG. [Figure 7] 7 is an enlarged view of a part of the shock absorbing structure 12 shown in FIG. 6. FIG. [Figure 8] 13 is a diagram showing another embodiment (embodiment 4) of the shock absorbing structure 12. FIG. [Figure 9] 13 is a diagram showing another embodiment (embodiment 5) of the shock absorbing structure 12. FIG. [Figure 10] 13 is a diagram showing another embodiment (embodiment 6) of the shock absorbing structure 12. FIG. [Figure 11] 13 is a diagram showing another embodiment (embodiment 7) of the shock absorbing structure 12. FIG. [Figure 12] 13 is a diagram showing another embodiment (embodiment 8) of the shock absorbing structure 12. FIG. [Figure 13] 13 is a diagram showing another embodiment (embodiment 9) of the shock absorbing structure 12. FIG. [Figure 14] FIG. 1 is a perspective view of a cap body 10 used in a simulation analysis. [Figure 15] FIG. 2 is a bottom view of the cap body 10 used in the simulation analysis. [Figure 16]FIG. 13 is a table summarizing the analysis results by simulation for the hat bodies of Measurement Examples 1 to 14 and the Reference Example. [Figure 17] FIG. 13 is a table summarizing the analysis results by simulation for the hat bodies of measurement examples 15 to 26. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings, etc. Note that each of the drawings shown below, including Fig. 1, is a schematic diagram, and the size and shape of each part are appropriately exaggerated to facilitate understanding. Furthermore, the numerical values ​​such as the dimensions of each component and the names of materials described in this specification are merely examples of an embodiment, and are not intended to be limiting, and may be appropriately selected and used.

[0018] (Embodiment) FIG. 1 is a diagram illustrating a helmet 1 according to the present embodiment. FIG. 2 is a perspective view showing the inside of the cap body 10 of the present embodiment. As shown in Fig. 1, the helmet 1 of this embodiment includes a hat body 10, a loop 13, a hammock 14, a headband 15, a chin strap 16, etc. The helmet 1 of this embodiment is for industrial use.

[0019] In each of the drawings shown below, including Fig. 1, XYZ Cartesian coordinates are used as appropriate. When the helmet 1 is in use (when worn on the wearer's head), the X direction is the left-right direction, the Y direction is the front-back direction, and the Z direction is the up-down front-back direction. Also, when the helmet 1 is in use, the right side is the +X side, the left side is the -X side, the upper side is the +Z side, the lower side is the -Z side, the front side is the +Y side, and the rear side is the -Y side.

[0020] The hat body 10 is a shell that covers and protects the head of a wearer. The hat body 10 is made of hard resin, for example, ABS resin, PC resin, FRP resin, PE resin, PP resin, or the like.

[0021] The cap body 10 of this embodiment includes a main body 11 and a shock absorbing structure 12. The cap body 10 also includes a brim 11a at the front lower end portion of the main body 11 that protrudes forward (to the +Y side). The point on the outer surface of the cap body 10 that is the vertex (the uppermost point when in use) is designated as t1. The point on the inner surface of the cap body 10 that corresponds to point t1 and is the vertex is designated as t2.

[0022] The shock absorbing structure 12 is formed on at least a part of the outer surface or the inner surface of the main body 11. The shock absorbing structure 12 has an uneven shape, and absorbs shock applied to the cap body 10 from the outside. In this embodiment, the shock absorbing structure 12 is formed on the inner surface of the main body 11 at least in a region corresponding to the top of the head of the wearer, but the shock absorbing structure 12 may be formed on the outer surface of the main body 11 at least in a region corresponding to the top of the head of the wearer. The shock absorbing structure 12 may be formed on the outer or inner surface of the main body 11 in a region other than the top of the head, for example, a part of the side portion (a region corresponding to the side of the wearer's head) or over the entire circumference of the side portion, or may be formed on the entire inner surface or the entire outer surface of the main body. Furthermore, the shock absorbing structure 12 may be formed on both the outer and inner surfaces of the main body 11. Here, the area corresponding to the top of the head is the area centered on points t1 and t2, which are the tops of the head, and the shape formed when this area is projected onto the XY plane along the Z direction is a circle with a diameter of 100 mm. The shock absorbing structure 12 is molded integrally with the main body 11. The resin forming the main body 11 and the resin forming the shock absorbing structure 12 may be different.

[0023] The shape of the region where the shock absorbing structure 12 is formed is preferably an ellipse, a circle, a polygon, or the like, centered on points t1 and t2 that are the vertices. In this embodiment, the shock absorbing structure 12 is formed along the inner surface of the main body 11 as an ellipse centered on point t2 that is the vertex, as an example. Details of the structure and the like provided in the shock absorbing structure 12 will be described later.

[0024] The loop 13, the hammock 14, and the headband 15 constitute a garment for attaching the helmet 1 to the head of the wearer. The garment made up of these members has the function of holding the helmet 1 on the head of the wearer and the function of absorbing shocks applied to the helmet 1 from the outside. The chin strap 16 is a member that is hung around the wearer's chin and has the function of preventing the helmet 1 from falling off or slipping off from the head. The chin strap 16 is connected to the headband 15. The chin strap 16 also includes a buckle and the like (not shown).

[0025] Fig. 3 is a diagram illustrating the shock absorbing structure 12 of this embodiment. Fig. 3 shows an enlarged view of a part of the shock absorbing structure 12 of this embodiment as viewed from the bottom side (-Z side) of the cap body 10. The shock absorbing structure 12 has an uneven shape. In this embodiment, the shock absorbing structure 12 will be described by taking, as an example, a form in which a plurality of ribs 121 protruding in a thin plate shape from the inner surface of the main body 11 of the cap body 10 are arranged as shown in Figs. 2 and 3. The ribs 121 protrude from the inner surface of the main body 11 with a predetermined width and height, are formed in stripes, and are arranged to form a plurality of regular hexagonal sections 122, forming a so-called honeycomb structure. The ribs 121 are unevenly shaped convex parts, and the sections 122 are unevenly shaped concave parts. Hereinafter, the form of the shock absorbing structure 12 shown in Figs. 2 and 3 will be referred to as form 1.

[0026] In order to achieve sufficient impact absorption in the hat body 10, the height of the rib 121 (the dimension from the inner surface of the main body 11 to the most protruding point of the rib 121), the width, the dimension of one side of the compartment 122, etc. can be set appropriately depending on the materials of the impact absorbing structure 12 and the main body 11 and the arrangement of the rib 121. In the shock absorbing structure 12 of form 1 shown in FIG. 2, it is preferable that the height of the rib 121 is 0.1 to 20 mm and the dimension of one side of the section 122 is 0.5 to 50 mm, from the viewpoint of realizing sufficient shock absorption of the cap body 10.

[0027] The arrangement of the ribs 121 is not limited to the above example, and may be other. For example, the ribs 121 may be arranged in stripes in a predetermined direction, or the ribs 121 may be arranged in a lattice pattern. The uneven shape of the shock absorbing structure 12 is not limited to that formed by the ribs 121 as described above, and may be other. Other configurations of the shock absorbing structure 12 will be described in detail later.

[0028] Providing the cap body 10 with such an impact absorbing structure 12 improves the impact absorption of the cap body 10 and the helmet 1, thereby improving safety. Also, providing the cap body 10 with the impact absorbing structure 12 allows the thickness of the main body 11 of the cap body 10 to be thin while adequately maintaining the impact absorption of the cap body 10, thereby enabling the cap body 10 and the helmet 1 to be made lighter.

[0029] (Regarding other forms of the shock absorbing structure 12) Fig. 4, Fig. 6, and Fig. 8 to Fig. 12 are diagrams showing other configurations (configurations 2 to 9) of the shock absorbing structure 12. Fig. 5 is a diagram showing an enlarged portion of the shock absorbing structure 12 shown in Fig. 4, and Fig. 7 is a diagram showing an enlarged portion of the shock absorbing structure 12 shown in Fig. 6. Note that Figs. 4, 6, and 8 to 12 shown below show each cap body 10 in a configuration in which the lower portion including the brim 11a of the cap body 10 and the like has been removed in accordance with the conditions in an evaluation test for shock absorption by a simulation to be described later.

[0030] In the second embodiment shown in Fig. 4 and Fig. 5, the shock absorbing structure 12 is provided along the inner surface of the main body 11 of the cap body 10, and has a first region 12A and a second region 12B. The first region 12A includes a point t2 which is the top of the head, and is the center region of the shock absorbing structure 12. The second region 12B is adjacent to the first region 12A and is located on the outer periphery side thereof. The arrangement of the ribs 121 is different between the first region 12A and the second region 12B.

[0031] In the shock absorbing structure 12 of the second embodiment shown in Fig. 4 and Fig. 5, a honeycomb structure is formed by the ribs 121 in the first region 12A and the second region 12B, and a plurality of hexagonal sections 122b are formed. Furthermore, in the first region 12A, a smaller hexagonal section 122a is formed by the ribs 121 at the center of the section 122b. Then, the ribs 121 are formed so that the corners of the section 122a are connected to the corners of the section 122b on the outer side thereof, and a trapezoidal section 122c (not shown in Fig. 5) is formed. That is, the first region 12A has a form in which the sections 122b are subdivided by the ribs 121.

[0032] In the third embodiment shown in Fig. 6 and Fig. 7, the shock absorbing structure 12 is provided along the inner surface of the main body 11 of the cap body 10, and has a first region 12A and a second region 12B. In both the first region 12A and the second region 12B, a honeycomb structure is formed by the ribs 121, but the dimensions of one side of the hexagonal sections 122a, 122b formed by the ribs 121 in each region are different. In the shock absorbing structure 12 of the third embodiment shown in Fig. 6 and Fig. 7, the length of one side of the section 122a in the first region 12A is smaller than that of the section 122b in the second region 12B.

[0033] 8 and 9 show an example of a configuration in which the shock absorbing structure 12 is provided along the inner surface of the main body 11 of the cap body 10, substantially over the entire surface. In the fourth embodiment shown in Fig. 8, the shock absorbing structure 12 has ribs 121 arranged radially around the apex point t2 along the inner surface of the main body 11, and further arranged concentrically at predetermined intervals. In Fig. 8, the lower end side (-Z side) of the radially arranged ribs 121 is gradually reduced in height.

[0034] In the shock absorbing structure 12 of the fifth embodiment shown in Fig. 9, the ribs 121 are arranged in a lattice pattern along the inner surface of the main body 11. In the shock absorbing structure 12 of the fifth embodiment shown in Fig. 9, the ribs 121 are arranged at predetermined intervals along the left-right direction (X direction) and the front-rear direction (Z direction), and particularly in the region near the point t2 which is the vertex, the sections 122 are square shaped.

[0035] Furthermore, as shown in FIGS. 10 to 13, the shock absorbing structure 12 may be formed on the outer surface of the main body 11 of the cap body . 10, for example, the shock absorbing structure 12 is provided along the outer surface of the main body 11, and has a plurality of grooves 123 formed with a predetermined width extending in the front-rear direction (Z direction) and the left-right direction (X direction) with the point t1, which is the vertex, as the center, and a stripe-like protrusion 124 formed between adjacent grooves 123. In addition, between the regions where the grooves 123 and protrusions 124 extending in the front-rear direction (Z direction) and the left-right direction (X direction) are formed, grooves 123 and protrusions 124 extending in an oblique direction toward the vertex are also formed.

[0036] 10, the depth is gradually reduced toward the lower end side (-Z side) of groove 123. Also, in FIG. 10, an example is shown in which groove 123 has a concavely curved bottom surface and protrusions 124 that are ridged, but the shape of the bottom surface of groove 123 and the shape of the slope of protrusions 124 are not limited to this example. Also, the arrangement pitch of groove 123 and protrusions 124 and the depth of groove 123 (height of protrusions 124) may change continuously or stepwise along the arrangement direction.

[0037] 11, the shock absorbing structure 12 is provided along the outer surface of the main body 11, and has a plurality of grooves 123 and protrusions 124 extending in the front-rear direction (Z direction) alternately arranged in the left-right direction (X direction). The grooves 123 and protrusions 124 are arranged at a predetermined pitch. Although not shown, the groove 123 shown in FIG. 11 has a rectangular cross-sectional shape along the arrangement direction. However, the cross-sectional shape of the groove 123 is not limited to this example and may be another shape. Also, FIG. 11 shows an example in which the groove 123 and the convex portion 124 of the shock absorbing structure 12 are not formed at both ends of the main body 11 in the left-right direction (X direction), but the groove 123 and the convex portion 124 may be formed at both ends of the main body 11 in the left-right direction (X direction). Also, the arrangement pitch of the groove 123 and the convex portion 124 and the depth of the groove 123 (the height of the convex portion 124) may change continuously or stepwise along the arrangement direction.

[0038] 12, the shock absorbing structure 12 is formed on the outer surface of the main body 11, and has a plurality of adjacent triangular surfaces 125. These surfaces 125 are inclined to each other, and the outer surface of the cap body 10 in this embodiment (the surface of the shock absorbing structure 12) has an uneven shape. In the embodiment 9 shown in Fig. 13, the shock absorbing structure 12 is formed on the outer surface of the main body 11, and has a configuration in which a plurality of unit shapes 127 are arranged at a predetermined interval. The unit shapes 127 are formed by arranging six triangular faces 125 centered on a point 126. The faces 125 are inclined so that the point 126 where the vertices of the six hexagons coincide in the unit shapes 127 becomes a convex portion.

[0039] The above-mentioned examples may be appropriately combined to provide the shock absorbing structure 12. By providing the shock absorbing structure 12, the shock absorbing property of the cap body 10 can be improved.

[0040] (Regarding the shock absorbing properties of the shock absorbing structure 12 of the embodiments 1 to 9) Regarding the impact absorption of the cap body 10, several cap bodies were prepared which differed in the presence or absence of an impact absorbing structure 12, its shape, the thickness distribution of the main body 11, etc., and the displacement and reaction force of each cap body were analyzed and evaluated using simulation software (Fusion 360) under the following conditions:

[0041] The conditions for evaluating the impact absorption properties by simulation are as follows. Fig. 14 is a perspective view of the cap body 10 used in the simulation analysis. Fig. 15 is a bottom view of the cap body 10 used in the simulation analysis. Figs. 14 and 15 show an example in which the shock absorbing structure 12 is provided on the inside of the main body 11. Shape of the cap: Approximately hemispherical shape with the lower part including the brim 11a of the cap 10 cut off as shown in Figs. 14 and 15 The fixing point of the cap body: the bottom surface 102 which is the cut surface of the lower part including the brim portion 11a, etc. Load location: Top 101 (a circular area with a diameter of 20 mm centered on the top point t1) Load value: 5000N A state in which a static load of 5000N was applied to the top part 101 of each cap body was analyzed by simulation.

[0042] The hat bodies of the reference example and measurement examples 1 to 14 will be explained. The cap body of the reference example corresponds to only the main body 11 without the impact absorbing structure 12. The cap body of this reference example is made of PP resin, and the thickness distribution of the main body 11 from the lower end of the side part, which is the part covering the side of the head, to point t1, which is the top of the head, is 2.0 to 3.7 mm. Here, the thickness at the lower end of the side part is the thickness at the bottom surface 102 of the helmet 1. Moreover, the thickness is the thickness of the main body 11 excluding the height of the rib 121 of the impact absorbing structure 12, etc. The caps of measurement examples 1 to 3 have the same shape as the cap of the reference example and do not have the shock absorbing structure 12, but the thickness distribution of the main body 11 and its material are different from those of the reference example.

[0043] The hat body of measurement example 1 is made of PP resin, like the hat body of the reference example, and the thickness distribution of the main body 11 from the side to point t1, which is the top of the head, is 1 mm larger than that of the hat body of the reference example, being 2.0 to 4.7 mm. The cap body of the measurement example 2 has the same thickness distribution of the main body portion 11 as the cap body of the reference example, but is made of a different material, ABS resin. The hat body of measurement example 3 is made of ABS resin, like the hat body of measurement example 2, and the thickness distribution of the main body 11 is the same as that of the hat body of measurement example 1, with the thickness distribution from the side to point t1, which is the top of the head, being 2.0 to 4.7 mm. The cap bodies of the reference example and measurement examples 1 to 3 do not have the impact absorbing structure 12 and correspond to comparative examples of the cap body 10 of this embodiment.

[0044] The cap bodies of measurement examples 4 to 14 correspond to the configuration in which the shock absorbing structure 12 is formed on the main body 11 having the same shape as the cap body of the reference example, and correspond to examples of the cap body 10 of this embodiment. In the caps of Measurement Examples 4 to 14, the ribs 121 in the shock absorbing structure 12 form a honeycomb structure, but the height of the ribs 121 and the dimensions of one side of the compartments 122 are different. The caps of Measurement Examples 4 to 14 are all made of PP resin, like the cap of the reference example. In addition, the caps of Measurement Examples 4 to 14 have a thickness distribution of 2.0 to 3.7 mm from the side of the main body 11 to the point t1, which is the vertex, which is the same thickness distribution as the cap of the reference example.

[0045] As shown in FIG. 15, in the caps of Measurement Examples 4 to 14, the shock absorbing structure 12 is provided on the inner surface of the main body 11 in an elliptical range centered on the point t2, which is the vertex. The shape formed when the region in which the shock absorbing structure 12 is provided is projected on the XY plane along the Z direction is an ellipse, and this ellipse (shown by a dashed line in FIG. 15) has a minor axis parallel to the left-right direction (X direction) and a major axis parallel to the front-rear direction (Y direction). In Measurement Examples 4 to 13, the minor axis S2 (left-right direction) of the ellipse is 110 mm, and the major axis S1 (front-rear direction) is 130 mm. In the cap of Measurement Example 14, the minor axis S2 (left-right direction) of the ellipse is 70 mm, and the major axis S1 (front-rear direction) is 80 mm, and the range in which the shock absorbing structure 12 is provided is smaller than that of the caps of Measurement Examples 4 to 13.

[0046] The caps of Measurement Examples 4 to 7, 13, and 14 are equipped with the shock absorbing structure 12 of Form 1 as shown in Fig. 2, and have in common the fact that a honeycomb structure made of ribs 121 is formed on the inside of the main body 11. However, the caps of Measurement Examples 4 to 7, 13, and 14 are different in the height of the rib 121 and the dimension of one side of the hexagonal compartment 122 formed by the rib. In addition, in the caps of Measurement Examples 4 to 14, the width of the rib 121 is 1 mm.

[0047] In the cap bodies of Measurement Examples 4 to 6, each side of the hexagonal honeycomb-structured compartments 122 formed by the ribs 121 is 5 mm. In addition, in the cap body of Measurement Example 4, the height of the rib 121 is 1 mm, in the cap body of Measurement Example 5, the height of the rib 121 is 2 mm, and in the cap body of Measurement Example 6, the height of the rib 121 is 5 mm. In the cap body of Measurement Example 7, each side of the hexagonal compartment 122 of the honeycomb structure formed by the rib 121 is 2 mm, and the height of the rib 121 is 1 mm. In addition, in the caps of Measurement Examples 11 and 12, the sides of the hexagonal honeycomb-structured compartments 122 formed by the ribs 121 are 1 mm long, and the height of the ribs 121 is 1 mm. However, as described above, the cap of Measurement Example 14 has a smaller area of ​​the shock absorbing structure 12 than the cap of Measurement Example 13.

[0048] The hat body of Measurement Example 8 is equipped with a shock absorbing structure 12 of Form 2 as shown in Figures 4 and 5. In the hat body of Measurement Example 8, the first region 12A of the shock absorbing structure 12 is a hexagonal region inscribed in a circle with a diameter of 63 mm centered at point t2, which is the vertex. This circular and hexagonal region are the circular and hexagonal shapes formed when the region in which the shock absorbing structure 12 is formed is projected along the Z direction onto the XY plane. In addition, in the hat body of measurement example 8, the height of the ribs 121 in the first region 12A and the second region 12B is 1 mm, one side of the hexagonal section 122b is 5 mm, and one side of the section 122a formed in the first region 12A is 1.5 mm.

[0049] The caps of Measurement Examples 9 to 12 are provided with an impact absorbing structure 12 of Form 3 as shown in Figures 6 and 7. The impact absorbing structure 12 of the caps of Measurement Examples 9 to 12 has a first region 12A and a second region 12B, and the first region 12A is a regular hexagonal region inscribed in a circle with a diameter of 50 mm and centered at point t2, which is the vertex. The cap bodies of measurement examples 9 to 12 have in common that one side of the hexagonal section 122 in the first region 12A is 1 mm, and one side of the hexagonal section 122b in the second region 12B is 8 mm, but the heights of the ribs 121 are different. The cap body of measurement example 9 has a height of rib 121 of 1 mm, the cap body of measurement example 10 has a height of rib 121 of 1.5 mm, the cap body of measurement example 11 has a height of rib 121 of 2 mm, and the cap body of measurement example 12 has a height of rib 121 of 5 mm.

[0050] FIG. 16 is a diagram showing a table summarizing the results of analysis by simulation for the hat bodies of Measurement Examples 1 to 12 and the Reference Example. The weight increase shown in the table of FIG. 16 is the increase in weight of each hat body when the weight of the hat body of the reference example is used as the standard. 16 is the amount of deformation at the point where the deformation was greatest in the top part 101 where a load was applied in the shock absorption test by simulation, and the direction of deformation from the point t1 which is the top of the head is not limited. From the viewpoint of protecting the head of the wearer, it is not preferable for the deformed hat body to come into contact with the head of the wearer, so it is preferable for the displacement to be small. The reaction force shown in the table of Fig. 16 is the force applied to the bottom surface 102, which is the fixed surface of each cap body, and the smaller the value, the better the cap body absorbs the impact. It is preferable that the reaction force is smaller than that of the cap body of the reference example. As for measurement example 13, the volume of analysis data became too large, and it was not possible to measure displacement, etc., so it is shown as not measurable.

[0051] As shown in the table of Fig. 16, by simply increasing the average thickness of the cap body (main body 11) as in the cap body of measurement example 1, the reaction force was larger than that of the reference example, and the impact could not be absorbed sufficiently. In addition, the cap body of measurement example 2, in which the resin used to form the cap body was changed, had a displacement and reaction force that was slightly smaller than that of the reference example. However, by increasing the average thickness of the cap body (main body 11) as in the cap body of measurement example 3, the displacement could be reduced compared to the cap body of the reference example, but the reaction force was larger.

[0052] In contrast, the caps of Measurement Examples 4 to 14, which are provided with the shock absorbing structure 12, all had smaller displacement and reaction force than the cap of the reference example. In particular, the reaction force of the caps of Measurement Examples 4 to 14 was significantly smaller than that of the cap of the reference example, and it was found that sufficient shock absorption could be achieved. In addition, the cap of Measurement Example 12 had the smallest displacement, and the reaction force of Measurement Example 14 had the smallest. Although no measurement results were obtained by simulation, the cap of Measurement Example 13, which is provided with a shock absorbing structure 12 of the same form as the cap of Measurement Example 14 and has a large surface area, is expected to have reaction force and displacement similar to or smaller than that of the cap of Measurement Example 14, based on the measurement results of the cap of Measurement Example 14 and the caps of Measurement Examples 4 to 7.

[0053] Also, for example, the cap bodies of measurement examples 4, 7, and 14 all have the shock absorbing structure 12 of form 1, and the height of the rib 121 is common at 1 mm, but the dimension of one side of the section 122 is different. In these three measurement examples, the smaller the dimension of one side of the section 122, the smaller the displacement and reaction force. In particular, the reaction force in measurement example 14, which has the smallest dimension of one side of the section 122 among the cap bodies of measurement examples 4, 7, and 14, was significantly smaller than that in measurement example 4, which has the largest dimension of one side.

[0054] In addition, when comparing the cap bodies of measurement examples 4 and 8, the cap body of measurement example 8 differs from measurement example 4 in that the sections 122 are subdivided in the first region 12A. The cap body of measurement example 8, which has finer sections formed near point t2, which is the vertex, had smaller displacement and reaction force than the cap body of measurement example 4.

[0055] Moreover, the caps of Measurement Examples 9 to 12 are equipped with the shock absorbing structure 12 of Form 3, and the dimensions of one side of each section of the first region 12A and the second region 12B are the same, but the heights of the ribs are different. Comparing the caps of Measurement Examples 9 to 12, the reaction force was smaller when the height of the rib 121 was smaller, but the displacement was smaller when the height of the rib 121 was larger.

[0056] Next, hat bodies of Measurement Examples 14 to 26 equipped with an impact absorbing structure 12 having a structure other than a honeycomb structure were prepared, and impact absorbing properties were analyzed and evaluated by simulation in the same manner as the hat bodies of Measurement Examples 1 to 14. The hat bodies of Measurement Examples 15 to 26 were made of PP resin, like the hat body of the reference example.

[0057] The caps of measurement examples 15 and 16 are formed with the shock absorbing structure 12 of form 4 as shown in Fig. 8. The cap of measurement example 15 has the same thickness distribution of the main body 11 as the cap of the reference example. The cap of measurement example 16 has a constant thickness distribution of 1.5 mm from the side of the main body 11 to the point t1, which is the top of the head. In the caps of the measurement examples 15 and 16, the height of the rib 121 near the point t2, which is the top of the head, is 6.2 mm, and the width of the rib 121 is 0.9 mm. The diameter of the circle formed by the rib 121 with the point t2 as the center closest to the point t2 is 14.1 mm, and the ribs 121 form an elliptical shape every 27 mm in the minor axis direction and every 32 mm in the longitudinal direction from this circle along the inner surface of the main body 11. Note that, in FIG. 8, the radially arranged ribs 121 are arranged in an example in which 12 ribs 121 are arranged every 30 degrees around the point t2 near the center of the shock absorbing structure 12, and 24 ribs are arranged every 15 degrees from the next ellipse, but the number of ribs is not limited to this.

[0058] The caps of measurement examples 17 and 18 are formed with the shock absorbing structure 12 of form 5 as shown in Fig. 9. The cap of measurement example 17 has the same thickness distribution of the main body 11 as the cap of the reference example. The cap of measurement example 18 has the main body 11 with a thickness of 1.5 mm. In the caps of Measurement Examples 17 and 18, the height of the rib 121 near the point t2 that is the vertex is 6.3 mm, and the width of the rib 121 is 0.9 mm. Also, near the point t2 that is the vertex, one side of the square-shaped section 122 is 11.1 mm.

[0059] The caps of measurement examples 19 and 20 are formed with an impact absorbing structure 12 of form 6 as shown in Fig. 10. The cap of measurement example 19 has a thickness distribution of the main body 11 similar to that of the cap of the reference example. The cap of measurement example 20 has a thickness of the main body 11 of 1.5 mm. The arrangement pitch of the convex parts 124 (width of the grooves 123) is 13.5 mm, and the height of the convex parts 124 (depth of the grooves 123) is 2.5 mm.

[0060] The cap bodies of measurement examples 21 and 22 are formed with an impact absorbing structure 12 of form 7 as shown in Fig. 11. The cap body of measurement example 21 has a thickness distribution of the main body 11 similar to that of the cap body of the reference example. The cap body of measurement example 22 has a thickness of 1.5 mm for the main body 11. The arrangement pitch of the convex parts 124 (arrangement pitch of the grooves 123) is 2.4 mm, and the height of the convex parts 124 (depth of the grooves 123) is 2.0 mm.

[0061] The caps of measurement examples 23 and 24 are formed with an impact absorbing structure 12 of form 8 as shown in Fig. 12. The cap of measurement example 23 has a thickness distribution of the main body 11 similar to that of the cap of the reference example. The cap of measurement example 24 has a thickness of 1.5 mm for the main body 11. One side of the triangular surface 125 is 35 mm. Moreover, the unevenness on the outer surface of the main body 11 formed by arranging these triangular surfaces 125 has a height of 1.0 mm.

[0062] The caps of measurement examples 25 and 26 are formed with an impact absorbing structure 12 of form 9 as shown in Fig. 13. The cap of measurement example 25 has a thickness distribution of the main body 11 similar to that of the cap of the reference example. The cap of measurement example 26 has a thickness of the main body 11 of 1.5 mm. In the vicinity of point t1, which is the vertex, one side of the hexagonal shape of unit shape 127 is 15.3 mm, and the protruding height of point 126 is 4.5 mm.

[0063] FIG. 17 is a diagram showing a table summarizing the analysis results by simulation for the hat bodies of measurement examples 15 to 26. The weight increase shown in the table of Fig. 17 is the increase in weight of each shell when the weight of the shell of the reference example is used as a reference, similar to the table of Fig. 16. The displacement and reaction force shown in the table of Fig. 17 are synonymous with the displacement and reaction force in the table of Fig. 16.

[0064] As shown in the table of Fig. 17, when the shock absorbing structure 12 having a structure other than a honeycomb structure is provided to the hat body, in terms of displacement, for the hat body with the same average thickness as the reference example, only measurement example 19 had a larger displacement than the reference example, but the other hat bodies of measurement examples 15, 17, 21, 23, and 25 had smaller displacement. Also, when the average thickness was set to 1.5 mm, thinner than the reference example, the hat body of measurement example 26 had a smaller displacement than the hat body of the reference example, but the other hat bodies of measurement examples 16, 18, 20, 22, and 24 had a larger displacement than the hat body of the reference example.

[0065] In addition, the reaction force was smaller than that of the reference example for the cap bodies of measurement examples 15, 17, 19, 21, 23, and 25, in which the average thickness of the main body 11 was the same as that of the reference example. Also, the reaction force was sufficiently smaller than that of the reference example for the cap bodies of measurement examples 16, 18, 20, 22, 24, and 26, in which the average thickness of the main body 11 was 1.5 mm, which was smaller than that of the reference example. Therefore, impact absorption can be improved even when the cap body is provided with the impact absorbing structure 12 as in embodiments 4 to 9. Furthermore, when the cap body is provided with such an impact absorbing structure 12, the thickness of the cap body 10 can be made thinner than that of a conventional cap body. This allows the cap body 10 and the helmet 1 to be made lighter.

[0066] As described above, the cap body 10 of the present embodiment has the shock absorbing structure 12 on the outer or inner surface of the cap body 10, which can improve the shock absorbing properties of the cap body 10. Therefore, the safety of the cap body 10 and the helmet 1 can be improved. In addition, since the cap body 10 of this embodiment is provided with the shock absorbing structure 12, sufficient shock absorbing properties can be exhibited even if the average thickness of the main body 11 is thin. Therefore, the weight of the cap body 10 and the helmet 1 can be reduced, the burden on the wearer can be reduced, and comfort during wearing can be improved.

[0067] (Variations) The present invention is not limited to the above-described embodiment, and various modifications and variations are possible, and these are also within the scope of the present invention. (1) In the present embodiment, an example has been described in which the shock absorbing structure 12 is formed on the inner surface or the outer surface of the cap body 10, but this is not limiting, and the shock absorbing structure 12 may be provided on both the inner surface and the outer surface of the cap body 10. In this case, the shape of the shock absorbing structure 12 formed on the outer surface of the cap body 10 and the shape, rib arrangement shape, arrangement pitch, etc. of the shock absorbing structure 12 formed on the inner surface may be different from each other or may be the same shape.

[0068] (2) In the present embodiment, the helmet 1 does not have a styrofoam liner for shock absorption, but the present invention is not limited to this. For example, a liner may be provided between the cap body and the hammock. The cap body 10 of the present embodiment has improved shock absorption compared to conventional caps, so the thickness of the liner can be made thinner, reducing stuffiness. In addition, the helmet 1 may have a shock absorbing pad disposed between the hammock and the cap body, or the hammock may have the above-mentioned pad integrally therewith.

[0069] (3) As other forms of the shock absorbing structure 12, forms in which grooves and streak-like protrusions are formed along the outer surface of the main body 11, triangular surfaces 125 are arranged, and unit shapes 127 are arranged have been shown, but the present invention is not limited to these, and these shapes may be formed on the inner surface of the main body 11. Also, the shock absorbing structure 12 formed on the inside of the main body 11 and having ribs 121 arranged in a lattice or radial pattern may be formed only in the area covering the inner vertex of the main body 11. Furthermore, the cap body 10 may have an impact absorbing structure 12 that forms a honeycomb structure as shown in Figure 2, etc., formed on approximately the entire inner surface of the main body 11, or may have an impact absorbing structure 12 that forms a honeycomb structure as shown in Figure 2, etc., formed on approximately the entire outer surface.

[0070] (4) In the present embodiment, the shock absorbing structure 12 is formed on the outer or inner surface of the main body 11 in a region including the points t1 and t2 that are the vertex of the head, but the region in which the shock absorbing structure 12 is provided is not limited to this. For example, the shock absorbing structure 12 may be provided on the outer or inner surface of the main body 11 in a part of the side portion, particularly a part of the front side portion. Also, for example, the shock absorbing structure 12 may be provided on the outer or inner surface of the main body 11 around the entire circumference of the side portion. Furthermore, for example, the shock absorbing structure 12 may be provided on the outer or inner surface of the main body 11 in a form in which the shock absorbing structure 12 is provided on the vertex and parts of the front and rear side portions.

[0071] (5) In this embodiment, the helmet 1 has been described as being for industrial use, but the invention is not limited to this. It may also be a helmet for mountain climbing, commuting to school, bicycles, motorcycles, etc., or a helmet with a so-called half-type shape.

[0072] (6) As in the second and third embodiments shown as other embodiments of this embodiment, the shock absorbing structure 12 having the first region 12A and the second region 12B may have different shock absorbing structures formed in the first region 12A and the second region 12B. For example, the first region 12A may have a honeycomb structure formed by ribs 121, and the second region 12B may have a form in which the ribs are arranged radially from a point that is the apex of the first region 12A.

[0073] The present invention is not limited to the above-described embodiments and modifications, and may be combined as desired. [Explanation of symbols]

[0074] 1. Helmet 10 Hat body 11 Main body 12 Impact absorbing structure 12A 1st area 12B 2nd area 121 Rib Sections 122, 122a, 122b 123 Groove 124 Convex 125 sides 126 points 127 Unit Shape 13 Ring Cord 14. Hammock 15 Headband 16 Chin strap

Claims

1. A resin shell for use in a helmet, A main body that covers and protects the wearer's head; A hat body having an impact absorbing structure which is molded integrally with the main body portion in at least a portion of the outer or inner surface of the main body portion, has an uneven shape, and absorbs impacts applied to the hat body from the outside.

2. The shock absorbing structure is formed at least on the outer surface or the inner surface of the main body, in a region covering the top of the wearer's head. The hat body according to claim 1.

3. The shock absorbing structure has a plurality of thin plate-like protruding ribs arranged along the inner surface of the main body, and the ribs form a honeycomb structure. The hat body according to claim 1.

4. The shock absorbing structure has a plurality of ribs protruding in a thin plate shape arranged along the inner surface of the main body, and a plurality of sections that become recesses are formed by the ribs. The hat body according to claim 1.

5. The shock absorbing structure has a plurality of grooves arranged along the outer surface of the main body, and a stripe-like protrusion is formed between adjacent grooves. The hat body according to claim 1.

6. The shock absorbing structure has a plurality of polygonal faces arranged adjacent to each other on an outer surface of the main body, and the faces are inclined to each other. The hat body according to claim 1.

7. The shock absorbing structure is formed on the outer surface of the main body by arranging a plurality of unit shapes, each of which is a polygonal shape with a protruding center, at predetermined intervals. The hat body according to claim 1.

8. A hat body according to any one of claims 1 to 7, A wearing body including a loop string, a hammock, and a headband arranged inside the hat body; a chin strap connected to the headband and placed around the wearer's chin; A helmet equipped with

Images