Protective cap

Abstract

To provide a protective cap that can withstand an impact force and protect a head of a wearer even when it is lightweight.SOLUTION: There is provided a protective cap 1 including: a cap body 3 which is formed in a bowl shape and includes a left upper recess 15 which is recessed inward, a right upper recess 17 which is recessed inward, a left upper convex portion 19, a right upper convex portion 21, and a cap main body 13, the left upper convex portion 19 being provided in a part of the left upper recess 15 away from a boundary between a left upper recess 14 and a central portion 29 of the cap main body 13, and the right upper convex portion 21 being provided in a part of the upper right recess 17 away from a boundary between a right upper recess 18 and the central portion 29; a curved plate-shaped left cover 5 provided on the cap main body 13 so as to close the left upper recess 15; and a curved plate-shaped right cover 7 provided on the cap main body 13 so as to close the right upper recess 17.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a protective helmet, for example, one worn on the head by a worker. [Background technology]

[0002] Conventionally, a protective cap has been known that includes a cap body, a hard top cover, and a shock absorber (see Patent Document 1). In the conventional protective cap, the top cover has a predetermined width in the left-right direction. The top cover also extends long in the front-to-rear direction and is attached so as to cover the outer surface of the cap body, including the top part. Furthermore, a recess is provided in the portion of the cap body covered by the top cover, and a shock absorber is disposed in the recess. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-147731 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional protective helmets described above, the helmet body is made of low-foam polypropylene, but the helmet body is thick to withstand impact forces and protect the wearer's head, which makes it difficult to reduce the weight.

[0005] An object of the present invention is to provide a protective cap that is lightweight yet can withstand impact forces and protect the wearer's head. [Means for solving the problem]

[0006] A protective cap according to one aspect of the present invention is a protective cap having a bowl-shaped configuration including an upper-left concave portion that is concave inward, an upper-right concave portion that is concave inward, an upper-left convex portion, an upper-right convex portion, and a cap body main body portion that is composed of portions other than the upper-left concave portion, the upper-right concave portion, the upper-left convex portion, and the upper-right convex portion, wherein the upper-left convex portion is provided in a part of the upper-left concave portion away from the boundary between the upper-left concave portion and a central portion of the cap body main body, and the upper-right convex portion is provided in a part of the upper-right concave portion away from the boundary between the upper-right concave portion and the central portion of the cap body main body, a curved plate-shaped left cover that is installed on the cap body main body so as to cover the upper-left concave portion, and a curved plate-shaped right cover that is installed on the cap body main body so as to cover the upper-right concave portion.

[0007] In a protective cap according to an aspect of the present invention, the upper-left recess is configured to include an upper-left recess upright wall and an upper-left recess lower wall, the upper-left recess upright wall rises from the cap body main body toward the inside of the cap body at the boundary between the cap body main body and the upper-left recess, the upper-left recess lower wall is provided at the tip of the upper-left recess upright wall, the upper-left convex portion is configured to include an upper-left convex upright wall and an upper-left convex upper wall, the upper-left convex upright wall rises from the upper-left recess toward the outside of the cap body at the boundary between the upper-left recess and the upper-left convex portion, and the upper-left convex upper wall is provided at the tip of the upper-left convex upright wall. the upper right recess is configured to include a upper right recess upright wall and a upper right recess lower wall, the upper right recess upright wall rises from the cap body main body toward the inside of the cap body at the boundary between the cap body main body and the upper right recess, the upper right recess lower wall is provided at the tip of the upper right recess upright wall, the upper right convex portion is configured to include a upper right convex upright wall and an upper right convex upper wall, the upper right convex upright wall rises from the upper right recess toward the outside of the cap body at the boundary between the upper right recess and the upper right convex portion, and the upper right convex upper wall is provided at the tip of the upper right convex upright wall.

[0008] In the protective cap according to this aspect of the present invention, a left-side cushioning material is provided at the top of the inner surface of the lower wall of the upper left recess, and a right-side cushioning material is provided at the top of the inner surface of the lower wall of the upper right recess.

[0009] In the protective cap according to this aspect of the present invention, the left cover, the upper left recess, the right cover, and the upper right recess are provided with air through holes for allowing air to flow.

[0010] A protective helmet according to one aspect of the present invention is a protective helmet comprising: a bowl-shaped helmet body including a front upper recess that is recessed inward, a rear upper recess that is recessed inward, a front upper convex portion, a rear upper convex portion, and a helmet body main body portion that is composed of portions other than the front upper recess, the rear upper recess, the front upper convex portion, and the rear upper convex portion, wherein the front upper convex portion is provided in a portion of the front upper recess away from the boundary between the front upper recess and a central portion of the helmet body main body, and the rear upper convex portion is provided in a portion of the rear upper recess away from the boundary between the rear upper recess and the central portion of the helmet body main body; a curved plate-shaped front cover that is installed on the helmet body main body portion so as to cover the front upper recess; and a curved plate-shaped rear cover that is installed on the helmet body main body portion so as to cover the rear upper recess.

[0011] A protective helmet according to one aspect of the present invention is a protective helmet having a bowl-shaped helmet body that includes an upper recess that is recessed inward, a plurality of upper protrusions that are spaced apart from each other and provided in the upper recess, and a helmet body main body that is composed of parts other than the upper recess and the upper protrusions, and also has a bowl-shaped upper cover that is installed on the helmet body main body so as to cover the upper recess. [Effects of the Invention]

[0012] The present invention has the effect of providing a protective cap that is lightweight yet can withstand impact forces and protect the wearer's head. [Brief explanation of the drawings]

[0013] [Figure 1]1 is a perspective view of a protective cap according to an embodiment of the present invention. [Figure 2] 2 is a view showing the protective cap shown in FIG. 1 with the left and right covers removed. FIG. [Figure 3] 2 is a view showing the protective cap shown in FIG. 1 with the left cover, right cover, and cap body removed. FIG. [Figure 4] FIG. 4 is a view taken along the arrow IV in FIG. [Figure 5] FIG. 2 is a view taken along the arrow V in FIG. [Figure 6] FIG. 6 is a view taken along the arrow VI in FIG. [Figure 7] FIG. 7 is a view taken along arrow VII in FIG. [Figure 8] FIG. 2 is a cross-sectional view taken along the line VIII-VIII in FIG. [Figure 9] FIG. 2 is a cross-sectional view taken along the line IX-IX in FIG. [Figure 10] FIG. 2 is a cross-sectional view of the section XX in FIG. [Figure 11] 1 is a view taken along the arrow XI in FIG. 2. [Figure 12] FIG. 1 is a view taken along the arrow XII in FIG. 2. [Figure 13] 13 is a view taken along the arrow XIII in FIG. 2, showing only the cap body. [Figure 14] FIG. 14 is a view taken along the arrow XIV in FIG. [Figure 15] 1 is a diagram showing a schematic view of a protective cap body of a protective cap according to an embodiment of the present invention as viewed from the front to back. [Figure 16] (a) is a diagram showing a schematic view of the cap body of a protective cap according to an embodiment of the present invention as seen from above, (b) is a diagram equivalent to (a) and showing a schematic view of the cap body of a protective cap according to a first modified example, and (c) is a diagram equivalent to (a) and showing a schematic view of the cap body of a protective cap according to a second modified example. [Figure 17] FIG. 17 is a view corresponding to FIG. 16, showing a case where a protrusion is further provided. DETAILED DESCRIPTION OF THE INVENTION

[0014] The protective helmet 1 according to the embodiment of the present invention is used, for example, as an industrial helmet. Industrial helmets are classified into three types: "for flying / falling objects" that protect against danger from flying / falling objects, "for fall protection" that protect against danger from falls, and "for electricity" that protect against danger from electricity.

[0015] For ease of explanation, a predetermined direction in the protective helmet is defined as the front-to-rear direction, a predetermined direction perpendicular to the front-to-rear direction is defined as the left-to-right direction, and a direction perpendicular to the front-to-rear and left-to-right directions is defined as the up-down direction. Protective helmet 1 is formed symmetrically with respect to a plane that includes the center of protective helmet 1 and is perpendicular to the left-to-right direction.

[0016] 1 to 10, the protective cap 1 is configured to include a cap body 3, a left cover 5, a right cover 7, a headband 9, cushioning materials (head pads) 59, 61, and a chin strap (not shown). As shown in Fig. 2 and Figs. 11 to 14, the cap body 3 is configured to include a cap body main body 13, an upper left recess 15, an upper right recess 17, an upper left convex portion 19, and an upper right convex portion 21.

[0017] The cap body 13 and covers 5 and 7 are made of synthetic resin such as ABS or polycarbonate, and the headband 9 is made of synthetic resin such as PE, PP or TPE. The cushioning materials 59 and 61 are made of elastic synthetic resin such as urethane foam. Materials conventionally used in industrial helmets may also be used.

[0018] The portion of the cap body 3 from which the upper left recess 15, the upper right recess 17, the upper left convex portion 19, and the upper right convex portion 21 have been removed becomes the cap body main body 13. When the cap body main body 13 is viewed from the front to back direction, as shown in Fig. 15, a pair of fan-shaped cutouts 25 are formed in the locations where the upper left recess 15, the upper right recess 17, the upper left convex portion 19, and the upper right convex portion 21 were previously located.

[0019] The cap body 13 is configured to include a lower portion 27 and a central portion 29. The lower portion 27 is formed in an annular shape with a predetermined height dimension in the height direction. That is, the lower portion 27 rises a predetermined height from its lower end to the lower ends of the pair of fan-shaped cutouts 25. The central portion 29 has a predetermined width when viewed in the front-to-rear direction, and is formed in an arc shape (arch shape) when viewed from the side (left-to-right direction) as shown in Figs. 8 and 12.

[0020] The lower front end of central region 29 is connected to the upper front end of lower region 27, and the lower rear end of central region 29 is connected to the upper rear end of lower region 27. For ease of understanding, central region 29 is like the long hair in a mohawk (ridge cut). There are no steps or sharp bends at the connection between lower region 27 and central region 29, and the surface shape is smooth. Central region 29 is located between upper left recess 15 and upper right recess 17 in the left-right direction.

[0021] The upper left recess 15 is located on the left side of the cap body 3 and above the cap body 3, and is recessed toward the inside of the cap body 3 (toward the center of the opening 23 on the underside of the bowl-shaped cap body 3). The upper right recess 17 is located on the right side of the cap body 3 and above the cap body 3, and is recessed toward the inside of the cap body 3.

[0022] The upper-left convex portion 19 is provided in a portion of the upper-left recess 15. Furthermore, the upper-left convex portion 19 is spaced apart from the central portion 29. As a result, a gap 31 (see FIG. 11, etc.) is formed between the upper-left convex portion 19 and the central portion 29. To explain further, the upper-left convex portion 19 is spaced apart from the boundary between the upper-left recess 15 and the central portion 29, and protrudes outward from the upper-left recess 15 (toward the side away from the center of the opening 23 on the underside of the bowl-shaped cap body 3).

[0023] The upper right convex portion 21 is provided in a portion of the upper right recess 17. Furthermore, the upper right convex portion 21 is spaced apart from the central portion 29. As a result, a gap 33 (see FIG. 11, etc.) is formed between the upper right convex portion 21 and the central portion 29. To explain further, the upper right convex portion 21 is spaced apart from the boundary between the upper right recess 17 and the central portion 29, and protrudes outward from the upper right recess 17.

[0024] Although the upper left recess 15, the upper right recess 17, the upper left protrusion 19, and the upper right protrusion 21 are provided, the cap body 3 can be said to be formed roughly in a bowl shape with a predetermined thickness.

[0025] The cap body 3 is, for example, integrally molded, so that the cap body main body 13, the upper left recess 15, the upper right recess 17, the upper left protrusion 19, and the upper right protrusion 21 are integrated together.

[0026] The left cover 5 is formed in a curved plate shape. As shown in Fig. 9 and other figures, the left cover 5 is installed on the cap body 13 so as to cover the upper left recess 15 (so that the upper left recess 15 and the upper left protrusion 19 are positioned inside the cap body).

[0027] The right cover 7 is also formed in a curved plate shape. As shown in Fig. 9 and other figures, the right cover 7 is installed on the cap body main body 13 so as to cover the upper right recess 17 (so that the upper right recess 17 and the upper right protrusion 21 are positioned inside the cap body 3).

[0028] As shown in Figure 1 etc., in the protective cap 1, the edge of the left cover 5 is engaged with the edge of the upper left recess 15 along its entire circumference. In the protective cap 1, the edge of the right cover 7 is engaged with the edge of the upper right recess 17 along its entire circumference.

[0029] 9, in the protective cap 1, the tip (tip surface) of the upper left convex portion 19 and the left cover 5 are slightly separated, and a small gap 35 is formed between the tip (tip surface) of the upper left convex portion 19 and the left cover 5. Note that the tip of the upper left convex portion 19 and the left cover 5 may be configured to be in contact with each other.

[0030] Similarly, in the protective cap 1, the tip (tip surface) of the upper right convex portion 21 and the right cover 7 are slightly separated, and a small gap 37 is formed between the tip (tip surface) of the upper right convex portion 21 and the right cover 7. Note that the tip of the upper right convex portion 21 and the right cover 7 may be configured to be in contact with each other.

[0031] In the protective cap 1, the left cover 5 and the right cover 7 are attached to the cap body 13, so that the outer surface (convex upper surface) of the cap body 3 is a smoothly curved surface like a hemisphere. In the cap body 3 without the left cover 5 and the right cover 7, as can be seen from Figures 11 and 15, the upper left recess 15, the upper right recess 17, etc. are provided, so that there are steps and sharp bends on the outer surface.

[0032] The state in which the left cover 5 and the right cover 7 are installed on the cap body main body 13 (cap body 3 that does not have the upper left recess 15, the upper right recess 17, the upper left convex portion 19, and the upper right convex portion 21) is provisionally referred to as the cap body main body cover installed state.

[0033] When the cap body covers are installed, the cap body main body 13, the left cover 5, and the right cover 7 are formed in a bowl shape. It can also be said that the bowl-shaped cap body main body 13, the left cover 5, and the right cover 7 are formed in a roughly hemispherical shell shape. In addition, in the cap body 3 with the covers 5 and 7 installed, the upper left recess 15, the upper right recess 17, the upper left protrusion 19, and the upper right protrusion 21 can be said to protrude downward on the inside (concave side) of the bowl-shaped cap body main body 13, the left cover 5, and the right cover 7, which are formed in a hemispherical shell shape.

[0034] A hemispherical shell is one of the two solid shapes obtained when a spherical shell-like solid formed by removing a second sphere of a predetermined radius from a first sphere of a predetermined radius is divided by a predetermined plane. The radius of the second sphere is slightly smaller than the radius of the first sphere, and the centers of the first and second spheres are coincident. The predetermined plane includes the centers of the first and second spheres. The thickness of the bowl-shaped cap is the difference between the radius of the first and second spheres.

[0035] Furthermore, the bowl-shaped cap body main body 13, the left cover 5, and the right cover 7 are appropriately shaped to fit the shape of a person's head. That is, when the cap body main body covers are installed, the cap body main body 13, the left cover 5, and the right cover 7 are not formed into a perfect hemispherical shell shape, but are formed into a hemispherical shell shape that is close to the shape of a hemispherical shell.

[0036] As shown in Figure 2 etc., the upper left recess 15 is configured to include an upper left recess upright wall 39 of a predetermined thickness and an upper left recess lower wall 41 of a predetermined thickness. The upper left recess upright wall 39 is formed in a plate shape. The upper left recess lower wall 41 is also formed in a plate shape. The upper left recess upright wall 39 rises from the cap body main body 13 toward the inside of the cap body 3 at the boundary between the cap body main body 13 and the upper left recess 15.

[0037] To explain further, the edge of the left notch 25A, which is located on the left side of the pair of notches 25 (see FIG. 15) in the cap body main body 13, is annular. The upper-left recessed upright wall 39 rises from the edge of the left notch 25A along the entire length of the edge of the left notch 25A. From another perspective, since the upper-left recessed upright wall 39 protrudes downward from the edge of the left notch 25A, it can also be said that the upper-left recessed upright wall 39 rises from the edge of the left notch 25A. As shown in FIG. 12 etc., the rising height of the upper-left recessed upright wall 39 is low at the bottom of the cap body 3 and gradually increases toward the top.

[0038] An opening is formed at the tip (lower end) of upper-left recessed standing wall 39. Upper-left recessed lower wall 41 is formed in a curved plate shape and is provided at the tip (lower end) of upper-left recessed standing wall 39 so as to close the opening at the tip (lower end) of upper-left recessed standing wall 39. The value of the radius of curvature of upper-left recessed lower wall 41 is larger than the values ​​of the radii of curvature of cap body main body 13 and covers 5 and 7.

[0039] As shown in FIG. 2 etc., the upper-left convex portion 19 is configured to include an upper-left convex portion standing wall 43 of a predetermined thickness and an upper-left convex portion upper wall 45 of a predetermined thickness. The upper-left convex portion 19 is located at the center of the upper-left recess 15 in the front-to-rear direction. The lower end of the upper-left convex portion 19 is located at the upper end of the lower portion 27 of the cap body main body 13. The upper end of the upper-left convex portion 19 is slightly spaced from the center portion 29 of the cap body main body 13, with a gap 31 shown in FIG. 11 therebetween. The upper-left convex portion standing wall 43 is formed in a plate shape. The upper-left convex portion upper wall 45 is also formed in a plate shape.

[0040] The upper-left convex upright wall 43 rises from the upper-left recess 15 toward the outside of the cap body 3 at the boundary between the upper-left recess 15 and the upper-left convex portion 19. To explain further, as shown in FIG. 13 etc., the upper-left recess 15 is provided with a through-hole 47 that penetrates the upper-left recess 15 in its thickness direction. The upper-left convex upright wall 43 rises from the through-hole 47 over the entire length of the edge of the through-hole 47. As shown in FIG. 7 etc., the height of the rise of the upper-left convex upright wall 43 is low at the bottom of the cap body 3 and gradually increases toward the top.

[0041] An opening is formed at the tip (upper end) of upper-left convex wall 43. Upper-left convex upper wall 45 is formed in the shape of a curved plate, and is provided at the tip of upper-left convex wall 43 so as to close the opening at the tip of upper-left convex wall 43. The value of the radius of curvature of upper-left convex upper wall 45 is approximately equal to the value of the radius of curvature of left cover 5.

[0042] The upper right recess 17 is configured to include an upper right recess upright wall 49 of a predetermined thickness and an upper right recess lower wall 51 of a predetermined thickness. The upper right recess upright wall 49 is formed in a plate shape. The upper right recess lower wall 51 is also formed in a plate shape. The upper right recess upright wall 49 rises from the cap body main body 13 toward the inside of the cap body 3 at the boundary between the cap body main body 13 and the upper right recess 17.

[0043] To explain further, the edge of the left notch 25B, which is located on the right side of the pair of notches 25 in the cap body main body 13, is annular. The upper right recessed upright wall 49 rises from the edge of the right notch 25B along the entire length of the edge of the right notch 25B. From another perspective, since the upper right recessed upright wall 49 protrudes downward from the edge of the right notch 25B, it can also be said that the upper right recessed upright wall 49 rises from the edge of the right notch 25B. The rising height of the upper right recessed upright wall 49 is low at the bottom of the cap body 3 and gradually increases toward the top.

[0044] An opening is formed at the tip (lower end) of upper right recessed upright wall 49. Upper right recessed lower wall 51 is formed in a curved plate shape and is provided at the tip (lower end) of upper right recessed upright wall 49 so as to close the opening at the tip (lower end) of upper right recessed upright wall 49. The value of the radius of curvature of upper right recessed lower wall 51 is larger than the values ​​of the radii of curvature of cap body main body 13 and covers 5 and 7.

[0045] The upper right convex portion 21 is configured to include an upper right convex portion upright wall 53 of a predetermined thickness and an upper right convex portion upper wall 55 of a predetermined thickness. The upper right convex portion 21 is located at the center of the upper right recess 17 in the front-to-rear direction. The lower end of the upper right convex portion 21 is located at the upper end of the lower portion 27 of the cap body main body 13. The upper end of the upper right convex portion 21 is slightly spaced from the center portion 29 of the cap body main body 13. The upper right convex portion upright wall 53 is formed in a plate shape. The upper right convex portion upper wall 55 is also formed in a plate shape.

[0046] The upper right convex upright wall 53 rises from the upper right recess 17 toward the outside of the cap body 3 at the boundary between the upper right recess 17 and the upper right convex portion 21. To explain further, as shown in FIG. 13 etc., the upper right recess 17 is provided with a through hole 57 that penetrates the upper right recess 17 in the thickness direction. The upper right convex upright wall 53 rises from the through hole 57 over the entire length of the edge of the through hole 57. The height of the rise of the upper right convex upright wall 53 is low on the lower side of the cap body 3 and gradually increases toward the upper side.

[0047] An opening is formed at the tip (upper end) of right upper convex upright wall 53. Right upper convex upper wall 55 is formed in a curved plate shape and is provided at the tip of right upper convex upright wall 53 so as to close the opening at the tip of right upper convex upright wall 53. The value of the radius of curvature of right upper convex upper wall 55 is approximately equal to the value of the radius of curvature of left cover 5.

[0048] 3, 6, 8, 9, etc., a left-side cushion material 59, which has a predetermined width in the left-right direction, a predetermined thickness in the up-down direction, and extends long in the front-to-rear direction, is provided at the top of the inner surface (lower surface) of the lower wall 41 of the upper-left recess. The left-side cushion material 59 is designed to come into direct contact with the head of a person wearing the protective cap 1.

[0049] In addition, a right cushion material 61, which has a predetermined width in the left-right direction, a predetermined thickness in the up-down direction, and extends long in the front-to-back direction, is provided at the top of the inner surface (lower surface) of the lower wall 51 of the upper right recess. The right cushion material 61 is also designed to come into direct contact with the head of the wearer of the protective cap 1.

[0050] 1, 2, etc., air through holes 63 for air flow are provided in the cap body main body 13, the left cover 5, the upper left recess 15, the right cover 7, and the upper right recess 17. The air through holes 63 adjust the strength and rigidity of the cap body 3 and also serve to mitigate impact forces applied to the protective cap 1. The air through holes 63 penetrate the wall of the cap body main body 13, the wall of the left cover 5, the wall of the upper left recess 15, the wall of the right cover 7, and the wall of the upper right recess 17 in the thickness direction thereof.

[0051] Here, the protective cap 1 will be described in more detail. As shown in Figure 2 etc., the upper left recess upright wall 39 of the upper left recess 15 is configured to include a central section 65 and a lower section 67. The thickness direction of the central section 65 is the left-right direction. The thickness direction of the lower section 67 is the up-down direction. A step portion 69 is provided in the central section 65.

[0052] The step portion 69 of the central portion-side portion 65 and the lower portion-side portion 67 are provided with locking portions 71 for locking the left-side cover 5. The locking portions 71 are formed, for example, by a plurality of through holes. The left-side cover 5 is provided with locked portions 73 (see FIG. 8) formed, for example, by a plurality of protrusions.

[0053] The plurality of protrusions constituting the locked portion 73 engage with the plurality of through holes constituting the locking portion 71, so that the locked portion 73 is locked to the locking portion 71, and the left cover 5 is installed on the cap body 13. The locked portion 73 is locked to the locking portion 71 by, for example, a snap fit method.

[0054] As shown in Figure 13, the through hole 47 provided in the lower wall 41 of the upper-left recess is formed in a rectangular shape. The through hole 47 is located in the center of the lower wall 41 of the upper-left recess in the front-to-rear direction. The lower end of the through hole 47 is located at a lower-side region 67 of the upright wall 39 of the upper-left recess. The upper end of the through hole 47 is away from the central-side region 65 of the upright wall 39 of the upper-left recess. More precisely, a portion of the through hole 47 is also provided in the lower-side region 67 of the upper-left recess 15.

[0055] The upper-left convex upright wall 43 stands from each of three of the four sides that make up the edge of the through-hole 47. The first of the three sides is located in front of the through-hole 47 and extends upward from the lower portion 67 of the upper-left recess 15. The second of the three sides is located in the rear of the through-hole 47 and extends upward from the lower portion 67 of the upper-left recess 15, parallel to the first side. The third of the three sides connects the upper ends of the first and second sides and extends generally in the front-to-rear direction. The fourth of the four sides is located in the lower portion 67.

[0056] Upper left protrusion top wall 45 is formed in a rectangular shape similar to through-hole 47. When viewed in the thickness direction of upper left protrusion top wall 45, each of the four sides of upper left protrusion top wall 45 is located at each of the four sides that form the edge of through-hole 47.

[0057] As can be seen from the front-rear view, as shown in Figures 9 and 11, a gap 31 is formed between the upper left convex portion 19 and the central portion 29 of the cap body 13. The through-hole 47 also functions as an air through-hole 63.

[0058] Furthermore, since the protective cap 1 is formed symmetrically, the upper right recess 17, the upper right protrusion 21, the right cover 7, etc. are configured in the same manner as the upper left recess 15, the upper left protrusion 19, the left cover 5, etc.

[0059] While conventional helmets have a thickness of approximately 3 mm at the top of the head, the thickness of the central portion 29 of the helmet body 13 in the helmet 1 is approximately 1.5 mm, and the thickness of the left cover 5 and right cover 7 is also approximately 1.5 mm. This is because conventional helmets absorb impact forces on a single surface, requiring thickness to cushion the impact in that area. In contrast, the helmet 1 absorbs impact forces at the central portion 29 and cushions them on two surfaces, the upper left recessed upright wall 39 and the upper right recessed upright wall 49, thereby reducing the thickness by approximately half compared to conventional helmets. This reduces the thickness of the helmet body and covers, resulting in a lighter helmet weighing approximately 210 g compared to the weight of a conventional helmet alone, which is approximately 260 g.

[0060] Here, we will explain how the protective cap 1 behaves when it receives an impact force. When an impact force is applied from directly above the protective cap 1, the top portion of the central portion 29 of the cap body 13 mainly deforms, absorbing the impact force.

[0061] More specifically, the upper left recessed upright wall 39 and the upper right recessed upright wall 49, which are connected to the central portion 29 near the portion where the impact force is applied, are compressed by the impact force and deform into a V shape, thereby absorbing the impact force. In addition, since there is a predetermined distance between the upper left recessed upright wall 39 and the upper right recessed upright wall 49, the impact force is dispersed when an impact occurs.

[0062] When an impact force is applied to the protective cap 1 from diagonally above and in front, the diagonally front portion of the central portion 29 of the cap body 13 is primarily deformed to absorb the impact force. When an impact force is applied to the protective cap 1 from diagonally above and behind, the diagonally rear portion of the central portion 29 of the cap body 13 is primarily deformed to absorb the impact force.

[0063] More specifically, the upper left recessed upright wall 39 and the upper right recessed upright wall 49, which are connected to the central portion 29 near the portion where the impact force is applied, are compressed by the impact force and deform into a V shape, thereby absorbing the impact force. In addition, since there is a predetermined distance between the upper left recessed upright wall 39 and the upper right recessed upright wall 49, the impact force is dispersed when an impact occurs.

[0064] When an impact force is applied diagonally from the upper left of the protective cap 1, the upper left convex portion 19 is pressed by the left cover 5 and is mainly deformed, absorbing the impact force. When an impact force is applied diagonally from the upper right of the protective cap 1, the upper right convex portion 21 is pressed by the right cover 7 and is mainly deformed, absorbing the impact force.

[0065] To explain in more detail, the upper left convex upright wall 43 connected to the upper left convex portion 19 near the area where the impact force is applied and its paired upper left convex upright wall 43 are compressed by the impact force and deform into a V shape, thereby absorbing the impact force. The same is true for the upper right convex portion 21 side. In addition, since there is a predetermined distance between the paired upper left convex upright walls 43, the impact force is dispersed when an impact is applied.

[0066] The protective cap 1 is configured with a bowl-shaped cap body 3 having an upper left recess 15, an upper right recess 17, an upper left convex portion 19, an upper right convex portion 21, and a cap body main body 13. The protective cap 1 is also configured with curved left and right covers 5 and 7 that cover the upper left recess 15 and the upper right recess 17. The cap body 3 and the left and right covers 5 and 7 are formed in the shape of thin plates. This allows the protective cap 1 to be made lighter.

[0067] Furthermore, the upper left convex portion 19 is spaced apart from the central region 29 of the cap body main body 13, and the upper right convex portion 21 is spaced apart from the central region 29 of the cap body main body 13. This configuration allows the rigidity of the upper left convex portion 19, the rigidity of the upper right convex portion 21, and the rigidity of the central region 29 of the cap body main body 13 to be adjusted appropriately. When an impact force is applied to the cap body main body 13 or the covers 5, 7 from outside the protective cap 1, the upper left convex portion 19, the upper right convex portion 21, and the central region 29 deform appropriately, absorbing the impact force and protecting the wearer's head.

[0068] To explain in more detail, by separating the upper left convex portion 19 and the upper right convex portion 21 from the central portion 29, the rigidity of the wall portion can be adjusted appropriately, and when an impact force is applied, the wall portion is compressed to induce a U-shaped deformation, thereby mitigating the impact force.

[0069] In addition, in the protective cap 1, the upper-left recess 15 is configured to include an upper-left recess upright wall 39 and an upper-left recess lower wall 41. The upper-left recess upright wall 39 rises from the cap body main body 13 toward the inside of the cap body 3 at the boundary between the cap body main body 13 and the upper-left recess 15. The upper-left recess lower wall 41 is provided at the tip of the upper-left recess upright wall 39 so as to close the opening at the tip of the upper-left recess upright wall 39.

[0070] The upper-left convex portion 19 is configured to include an upper-left convex portion upright wall 43 and an upper-left convex portion upper wall 45. The upper-left convex portion upright wall 43 rises from the upper-left recess 15 toward the outside of the cap body 3 at the boundary between the upper-left recess 15 and the upper-left convex portion 19. The upper-left convex portion upper wall 45 is provided at the tip of the upper-left convex portion upright wall 43 so as to close the opening at the tip of the upper-left convex portion upright wall 43. The upper-right recess 17 and the upper-right convex portion 21 are also configured and provided in the same manner as the upper-left recess 15 and the upper-left convex portion 19.

[0071] As a result, the cap body 3 is generally plate-shaped, which makes it easy to reduce the weight and also makes it easy to adjust the rigidity of the upper left recess 15, the upper left protrusion 19, the upper right recess 17 and the upper right protrusion 21.

[0072] Furthermore, in the protective cap 1, a left cushion material 59 is provided at the apex of the inner surface of the lower wall 41 of the upper left recess, and a right cushion material 61 is provided at the apex of the inner surface of the lower wall 51 of the upper right recess. This allows the wearer to wear the protective cap 1 comfortably without the need for a hammock. Furthermore, by appropriately adjusting the rigidity of the upper left recess 15, the upper left convex portion 19, the upper right recess 17, and the upper right convex portion 21, the impact force can be absorbed by the cushion materials 59, 61 without the need for a hammock.

[0073] Additionally, the protective cap 1 is provided with air through holes 63 for allowing air to flow through the left cover 5, the upper left recess 15, the right cover 7, and the upper right recess 17. This allows the head of the wearer of the protective cap 1 to be cooled, minimizing discomfort to the wearer.

[0074] In the above description, the central portion 29 of the cap body main body 13 extends in the front-to-back direction as shown in Figure 16(a), but the central portion 29a of the cap body main body 13a may also extend in the left-to-right direction as shown in Figure 16(b).

[0075] In addition, the configuration shown in Figure 16(b) includes a front upper recess 15a corresponding to the upper left recess 15, a rear upper recess 17a corresponding to the upper right recess 17, a front upper convex portion 19a corresponding to the upper left convex portion 19, and a rear upper convex portion 21a corresponding to the upper right convex portion 21.

[0076] To explain further, the protective cap 1a shown in Figure 16(b) is configured to include a cap body 3a, a curved plate-shaped front cover (not shown), and a curved plate-shaped rear cover (not shown).

[0077] The cap body 3a is configured to include a front upper recess 15a, a rear upper recess 17a, a front upper convex portion 19a, a rear upper convex portion 21a, and a cap body main body portion 13a. The front upper recess 15a is located on the front upper side of the cap body 3a and is recessed inward. The rear upper recess 17a is located on the rear upper side of the cap body 3a and is recessed inward.

[0078] The front upper convex portion 19a is provided in a portion of the front upper concave portion 15a away from the boundary between the front upper concave portion 15a and the central portion 29a of the cap body main body 13a. The rear upper convex portion 21a is provided in a portion of the rear upper concave portion 17a away from the boundary between the rear upper concave portion 17a and the central portion 29a of the cap body main body 13a.

[0079] The cap body main body 13a is composed of the parts other than the front upper recess 15a, the rear upper recess 17a, the front upper convex portion 19a, and the rear upper convex portion 21a. The cap body 3a is formed in a bowl shape with a predetermined thickness.

[0080] The front cover is attached to the cap body 13a so as to close the front upper recess 15a, and the rear cover is attached to the cap body 13a so as to close the rear upper recess 17a.

[0081] Also, as shown in FIG. 16(c), the cap body 13b (corresponding to the lower portion 27) from which the central portion 29 has been removed may be provided with an upper recess 15b and a plurality of upper protrusions 19b.

[0082] To explain in more detail, a protective cap 1b shown in FIG. 16(c) is configured to include a cap body 3b and an upper cover (not shown).

[0083] The cap body 3b is configured to include an upper recess 15b, multiple upper protrusions 19b, and a cap body main body 13b. The upper recess 15b is located from the middle to the upper end of the cap body 3b and is recessed inward. The multiple upper protrusions 19b are provided in the upper recess 15b and spaced apart from one another. The cap body main body 13b is configured of the areas other than the upper recess 15b and the upper protrusions 19b.

[0084] The cap body 3b is formed in a bowl shape with a predetermined thickness. The upper cover is installed on the cap body main body 13b so as to cover the upper recess 15b. The cap body 3b shown in Figure 16(c) has five upper protrusions 19b. The five upper protrusions 19b are provided at the top, diagonally front side, diagonally rear side, diagonally left side, and diagonally right side of the upper recess 15b.

[0085] In the embodiments described above, the upper left convex portion 19 and the upper right convex portion 21 are provided in the temporal region, but convex portions 75 having substantially the same shape as the upper left convex portion 19 and the upper right convex portion 21 may be provided in front and behind the upper left convex portion 19 and in front and behind the upper right convex portion 21 (see FIG. 17(a)). That is, convex portions 75 may be provided diagonally in front and diagonally behind. Furthermore, the size of convex portion 75 may be changed or convex portion 75 may be tilted so that it fits into the upper left recess 15 and the upper right recess 17.

[0086] Similarly, as shown in Figures 17(b) and (c), protrusions 75 may be provided on the diagonally front side and diagonally rear side. Note that Figure 17(a) is a diagram showing Figure 16(a) with protrusions 75 provided, Figure 17(b) is a diagram showing Figure 16(b) with protrusions 75 provided, and Figure 17(c) is a diagram showing Figure 16(c) with protrusions 75 provided.

[0087] Although the present embodiment has been described above, the present embodiment is not limited to this, and various modifications are possible within the scope of the gist of the present embodiment. [Explanation of symbols]

[0088] 1 Hard hat 1a Hard hat 1b Hard hat 3. Hat body 3a Hat body 3b Cap body 5 Left cover 7 Right side cover 13 Cap body 13a Cap body part 13b Cap body part 15 Upper left recess 15a Front upper recess 15b Upper recess 17 Upper right recess 17a Rear upper recess 19 Upper left convex part 19a Front upper convex part 19b Upper convex part 21 Upper right convex part 21a Rear upper convex part 29 Central part 39 Upper left recessed wall 41 Upper left concave lower wall 43 Upper left convex wall 45 Upper left convex part upper wall 49 Upper right recessed wall 51 Upper right concave lower wall 53 Upper right convex wall 55 Upper right convex part upper wall 59 Left side cushioning 61 Right side cushioning 63 Air Through Hole

Claims

1. a cap body formed in a bowl shape and including an upper left recess that is recessed inward, an upper right recess that is recessed inward, an upper left convex portion, an upper right convex portion, and a cap body main body portion that is composed of portions other than the upper left recess, the upper right recess, the upper left convex portion, and the upper right convex portion, wherein the upper left convex portion is provided in a part of the upper left recess away from the boundary between the upper left recess and a central portion of the cap body main body, and the upper right convex portion is provided in a part of the upper right recess away from the boundary between the upper right recess and the central portion of the cap body main body; a curved plate-shaped left cover attached to the cap body so as to cover the upper left recess; a curved plate-shaped right cover that is installed on the cap body so as to cover the upper right recess; A protective helmet having a

2. The upper left recess is configured to include an upper left recess upright wall and an upper left recess lower wall, the left upper recess standing wall rises from the cap body main body toward the inside of the cap body at the boundary between the cap body main body and the left upper recess, the lower wall of the upper left recess is provided at the tip of the upright wall of the upper left recess, the upper left convex portion is configured to include an upper left convex portion standing wall and an upper left convex portion upper wall, the upper left convex portion standing wall rises from the upper left concave portion toward the outside of the cap body at the boundary between the upper left concave portion and the upper left convex portion, the upper wall of the upper left convex portion is provided at the tip of the standing wall of the upper left convex portion, the upper right recess includes an upper right recess upright wall and an upper right recess lower wall, the upper right recessed portion standing wall rises from the cap body main body toward the inside of the cap body at a boundary between the cap body main body and the upper right recessed portion, the lower wall of the upper right recess is provided at a tip end of the upright wall of the upper right recess, the upper right convex portion is configured to include an upper right convex portion standing wall and an upper right convex portion upper wall, the upper right convex portion standing wall rises from the upper right concave portion toward the outside of the cap body at the boundary between the upper right concave portion and the upper right convex portion, 2. The protective cap according to claim 1, wherein the upper wall of the upper right convex portion is provided at a tip end of the upright wall of the upper right convex portion.

3. A left-side cushioning material is provided on the top of the inner surface of the lower wall of the upper left recess, 3. The protective cap according to claim 2, wherein a right cushioning material is provided at the top of the inner surface of the lower wall of the upper right recess.

4. The protective cap according to any one of claims 1 to 3, wherein the left cover, the upper left recess, the right cover, and the upper right recess are provided with air through holes for allowing air to flow.

5. a cap body formed in a bowl shape and including a front upper recess that is recessed inward, a rear upper recess that is recessed inward, a front upper convex portion, a rear upper convex portion, and a cap body main body portion constituted by portions other than the front upper recess, the rear upper recess, the front upper convex portion, and the rear upper convex portion, wherein the front upper convex portion is provided in a portion of the front upper recess away from the boundary between the front upper recess and a central portion of the cap body main body, and the rear upper convex portion is provided in a portion of the rear upper recess away from the boundary between the rear upper recess and the central portion of the cap body main body; a curved plate-shaped front cover that is installed on the cap body so as to cover the front upper recess; a curved plate-shaped rear cover that is installed on the cap body portion so as to close the rear upper recess; A protective helmet having a

6. a bowl-shaped cap body including an upper recess that is recessed inward, a plurality of upper protrusions that are spaced apart from each other and provided in the upper recess, and a cap body main body that is composed of parts other than the upper recess and the upper protrusions; a bowl-shaped upper cover that is installed on the cap body portion so as to close the upper recess; A protective helmet having a

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