Inner cap

Abstract

To provide an inner cap which does not damage a head of a wearer when subjected to an external impact and has high impact absorption properties.SOLUTION: An inner cap 1 includes: a main body portion 11 that is hemispherical and covers a head of a wearer; a plurality of beam portions 12, 13 that are formed integrally with the main body portion 11, are located inside the main body portion 11, and are provided in a first region 111 that corresponds to a top side of the wearer's head; a plurality of openings 14 formed between the plurality of beam portions 12, 13 and the main body portion 11; and a rib 16 formed at least along an edge of the main body portion 11 on a side of the openings 14 and protruding outward.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an inner cap to be fitted inside a cloth hat or the like. [Background technology]

[0002] Conventionally, there has been known an inner cap that is fitted inside a hat made of cloth or the like for the purpose of protecting the head (see, for example, Patent Documents 1 and 2). This inner cap is fitted inside a work hat, hood, or the like worn by a worker performing work in a factory or the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5753673 [Patent Document 2] JP 2005-054298 A Summary of the Invention [Problem to be solved by the invention]

[0004] Some inner caps are provided with a plurality of beam-like members located inside the main body for the purpose of absorbing external impacts on the head. Some of these inner caps have ribs formed on the edges of the openings formed by providing the beam-like members in order to improve the strength of the main body. Since these ribs protrude inward (toward the head), when the inner cap is significantly deformed by an external impact, they may come into strong contact with the wearer's head and cause head injury.

[0005] An object of the present invention is to provide an inner cap which does not damage the wearer's head when subjected to an external impact and has high impact absorption properties. [Means for solving the problem]

[0006] The present invention solves the above problems by the following solving means. Note that, for ease of understanding, the following description will be given with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited thereto.

[0007] (1) An inner cap comprising: a main body portion that is hemispherical and covers the wearer's head; a plurality of beam portions that are formed integrally with the main body portion, are located more inward than the main body portion, and are provided in a first region that corresponds to the top of the wearer's head; a plurality of openings that are formed between the plurality of beam portions and the main body portion; and a rib that is formed along at least the edge of the main body portion on the opening side and is convex outward.

[0008] (2) The inner cap according to (1), wherein the ribs are further formed and arranged in a plurality in the first region.

[0009] (3) The inner cap according to (1) or (2), in which an impact absorbing material is disposed on at least a portion of the area on the outside of the main body portion near the point that becomes the top of the head.

[0010] (4) The inner cap described in (1) to (3), wherein the ribs are formed in multiple numbers in the first region, and the portion partitioned by the multiple ribs has a smaller thickness of the main body portion than other portions, or an opening is formed in the portion partitioned by the multiple ribs.

[0011] (5) The inner cap according to any one of (1) to (4), wherein the main body and the beams are not formed with a linear or dot-like shape that is convex inward. Effect of the Invention

[0012] According to the present invention, it is possible to provide an inner cap that does not damage the wearer's head when subjected to an external impact and has high impact absorption properties. [Brief description of the drawings]

[0013] [Figure 1] 1 is a perspective view of an inner cap 1 according to an embodiment, seen from above. [Diagram 2] FIG. 2 is a perspective view of the inner cap 1 of the embodiment as viewed from below. [Diagram 3] FIG. 2 is a schematic diagram showing a cross section of the inner cap 1 of the embodiment. [Figure 4] 1A and 1B are diagrams showing schematic diagrams illustrating deformation of the main body 11 when an iron ball is dropped on the tops of the inner cap 1 of the embodiment and the conventional inner cap 301. [Diagram 5] 1 is a graph showing test results of the impact absorbing performance of the inner caps of the examples and the comparative examples. [Figure 6] 3A and 3B are diagrams showing the inner caps of the examples and the comparative examples when worn on the head. [Figure 7] 13A to 13C are diagrams showing an example of a modified form of the inner cap 1. [Figure 8] 13A to 13C are diagrams showing an example of a modified form of the inner cap 1. [Figure 9] FIG. 13 is a diagram illustrating a conventional inner cap 301 serving as a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] 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. The numerical values ​​such as dimensions of each component and the names of materials described in this specification are merely examples of an embodiment, and are not limiting, and may be appropriately selected and used.

[0015] (Embodiment) FIG. 1 is a perspective view of an inner cap 1 of the present embodiment, seen from above. FIG. 2 is a perspective view of the inner cap 1 of this embodiment as viewed from below. Fig. 3 is a schematic diagram showing a cross section of the inner cap 1 of this embodiment. Fig. 3 shows a schematic cross section taken along a plane that passes through point u1, which is the top of the inner cap 1, and is parallel to the left-right direction (X direction). In addition, in each of the figures shown below, including Fig. 1, an XYZ Cartesian coordinate system is set as appropriate for ease of explanation and understanding. As shown in Fig. 1, etc., in the inner cap 1, the X direction is the left-right direction, the Y direction is the front-back direction, and the Z direction is the up-down direction. In addition, in the inner cap 1, the right side of the wearer is the +X side, the front side is the +Y side, and the upper side is the +Z side.

[0016] As shown in FIG. 1 etc., the inner cap 1 is substantially hemispherical (bowl-shaped, hemispherical shell-shaped), is fitted inside a hat such as a work hat (not shown), and is used to protect the wearer's head from falling objects etc. The inner cap 1 has a main body (shell) 11 and beams 12, 13 provided near the top of the main body 11. The inner cap 1 is made of resin such as polyethylene (PE), acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), polypropylene (PP), polyacetal (POM), etc., and the main body 11 and the beams 12, 13 are molded integrally. The inner cap 1 is formed symmetrically with respect to a plane that passes through point u1, which is the top of the main body 11, and is parallel to the front-rear direction (Y direction) of the main body 11.

[0017] The main body 11 is hemispherical and can cover the head of the wearer. The region of the main body 11 that corresponds to the top side of the wearer's head and is on the upper side (+Z side) where the beams 12, 13, etc. are formed is defined as a first region 111, and the region on the lower side (-Z side) of the first region 111 is defined as a second region 112.

[0018] The beam portion 12 is formed in two portions (12A, 12B) sandwiching a point u1 (hereinafter referred to as the vertex u1) that is the apex. The beam portion 12 is a long and thin plate, with one end in the longitudinal direction located on the front side (+Y side) of the first region 111 and the other end located behind the vertex u1. In addition, the beam portions 12A, 12B are formed to be inclined with respect to the front-rear direction (Y direction) so that when the inner cap 1 is viewed from the top (+Z side), the interval between the beam portions 12A, 12B in the left-right direction (X direction) is narrow at the other end that is the apex side, and the interval in the left-right direction (X direction) increases toward the front side (+Y side).

[0019] The beam portion 13 is formed with two beam portions 13A and 13B, one each on the left and right side of the head from the beam portion 12. The beam portion 13 is a long and thin plate, with one end in the longitudinal direction located on the rear side (-Y side) of the first region 111 and the other end located on the front side (+Y side) of the head vertex u1. When the inner cap 1 is viewed from above (+Z side), the beam portions 13A and 13B are inclined with respect to the front-rear direction (Y direction) so that the interval between the beam portions 13A and 13B in the left-right direction (X direction) is narrow at one end side, which is the head vertex side, and the interval in the left-right direction (X direction) increases toward the rear side (-Y side).

[0020] In this embodiment, as shown in Figs. 1 and 2, etc., a total of four beam portions 12 and 13 are provided near the vertex u1. For ease of understanding, in FIG. 1 etc., of the beam portions 12, 13, those on the right side (+X side) of the apex point u1 are referred to as 12A, 13A, and those on the left side (-X side) are referred to as 12B, 13B.

[0021] Both ends of the beams 12 and 13 in the longitudinal direction are connected to the main body 11 and molded as one piece, but both ends in the lateral direction are not continuous with the main body 11 and have openings 14. The beams 12 and 13 are located below (-Z side) the main body 11 in the up-down direction (Z direction), that is, inside the main body 11. The beams 12 and 13 are elastic and have the function of abutting at least three points appropriately against the wearer's head (not shown) when the inner cap 1 is worn, thereby determining its position. Since the beams 12 and 13 are located inside the main body 11 in the vertical direction (Z direction), a space (space A shown by a two-dot chain line in FIG. 3) is formed between the beams 12 and 13 and the main body 11. When an impact is applied to the inner cap 1 from the outside, the main body 11 and the beams 12 and 13 can deform within this space A to absorb the impact.

[0022] The main body 11 has an opening 14 between the beams 12 and 13, and thus has three ridge-like portions extending in the front-rear direction. In the main body 11, the portion between the beams 12A and 12B where the apex point u1 is located is particularly referred to as the first ridge portion 15.

[0023] A rib 16 for improving the strength of the main body 11 is formed along the edge of the opening 14 on the main body 11. The rib 16 is a thin plate-like member that protrudes outward from the main body 11. In addition to the above-mentioned ribs 16, a plurality of ribs 16 that protrude outward are formed and arranged along the front-rear and left-right directions in the first region 111 of the main body 11. These ribs 16 also form rectangular or other compartments. These ribs 16 are formed so that their height decreases toward the lower end side (-Z side) of the first region 111. By providing multiple ribs 16 like these in the inner cap 1 of this embodiment, the strength of the main body 11 is improved and the shock absorption properties of the inner cap 1 when an external impact is applied are further improved.

[0024] The second region 112 of the main body 11 has a plurality of notches 17 and holes 18 formed on the lower end side (−Z side). As shown in Fig. 1 etc., the cutout 17 is formed with a predetermined dimension so as to extend from the lower end of the main body 11 toward the top of the head. The cutout 17 is for changing the diameter dimension (diameter dimension at the lower end) of the inner cap 1 to fit the size of the wearer's head. The shape of the cutout 17 may be appropriately selected. The holes 18 are intended to ensure breathability when wearing the inner cap 1. In Fig. 1 and other figures, an example of the holes 18 having an oval shape is shown, but the shape may be appropriately selected and is not limited to an oval shape.

[0025] Fig. 9 is a diagram illustrating an inner cap 301 of a comparative example. Fig. 9(a) is a perspective view of the inner cap 301 of the comparative example seen from above, and Fig. 9(b) is a schematic diagram showing a cross section parallel to the left-right direction passing through point u1 which is the top of the inner cap 301 of the comparative example. The inner cap 301 of the comparative example shown in Fig. 9 corresponds to a conventional inner cap. The inner cap 301 of the comparative example has beams 12, 13, a first ridge portion 35, an opening 14, etc. in the main body portion 31, like the inner cap 1 of the present embodiment, but differs from the inner cap 1 of the present embodiment in that a rib 36 that is convex inward is formed on the edge of the main body portion 31 on the opening 14 side, instead of the rib 16 that is convex outward. This rib 36 is provided to maintain the strength of the main body portion 11.

[0026] When the conventional inner cap 301 receives an external impact on the top of the head, such as from a falling object, the impact is absorbed by the deformation of the main body 11 and the beams 12, 13 in the space A between the main body 11 and the four beams 12, 13. However, when an impact large enough to be absorbed is received, the ribs 36 may come into contact with the wearer's head and dig in or rub against it, causing injury to the head.

[0027] The inner cap 1 of this embodiment is also configured to absorb impact by deformation of the main body 11 and the beams 12, 13 in the space A between the beams 12, 13 and the main body 11. However, in this embodiment, as shown in Fig. 3, the edge of each ridge on the opening 14 side has a rib 16 that protrudes outward, but the inner surface of the inner cap 1 does not have a portion that protrudes inward like the rib 36 of the conventional example. Therefore, even if each ridge of the main body 11 deforms due to an external impact and comes into contact with the wearer's head, there is no risk of injuring the head.

[0028] The effects of the inner cap 1 of this embodiment will be described more specifically. Fig. 4 is a diagram showing the deformation of the main body parts 11, 31 when an iron ball is dropped on the tops of the inner cap 1 of this embodiment and the conventional inner cap 301. Fig. 4(a) shows the inner cap 1 of this embodiment, and Fig. 4(b) shows the conventional inner cap 301. Fig. 4 also shows, as an example, a case where an iron ball 60 hits a point u1 which is the top of the first ridge parts 15, 35 of the main body parts 11, 31 in both cases.

[0029] As shown in FIG. 4(b), in the conventional inner cap 301, the iron ball 60 hits the first ridge portion 35 at time t1, and the first ridge portion 35 deforms at time t2 to absorb the impact. At this time, the rib 36 comes into linear contact with the wearer's head H and may bite into the head H. In addition, the rib 36 comes into linear contact with the head H to disperse the impact, resulting in low impact absorption. Next, at time t3, the rib 36 falls or deforms to further absorb the impact, but since the rib 36 deforms while in linear contact with the head H, it is highly likely to injure the head H and the impact absorption performance is not sufficient. Even if the corners of the rib 36 are processed into a curved surface, the bite of the rib 36 into the head H and scratches due to the deformation of the rib 36 are not sufficiently reduced. In addition, as described above, the inwardly protruding rib 36 may injure the wearer's head, so the area in which it can be provided to improve the strength of the main body 11 is limited, and therefore the shock absorbing properties and strength of the inner cap 301 cannot be sufficiently improved.

[0030] In contrast, as shown in FIG. 4(a), in the inner cap 1 of this embodiment, the iron ball 60 hits the first ridge portion 15 at time t1, and the first ridge portion 15 deforms at time t2 to absorb the impact. At this time, the rib 16 formed on the first ridge portion 15 is outwardly convex, and the inner surface of the first ridge portion 15 abuts against the wearer's head H, dispersing the impact. Next, at time t3, the rib 16 formed on the first ridge portion 15, which is outwardly convex, deforms to further absorb the impact. At this time, the rib 16 does not hit the wearer's head H, and there is no risk of injuring the head H.

[0031] Furthermore, in the inner cap 1 of this embodiment, the inner surface of the first ridge portion 15 of the main body portion 11 comes into contact with the head H to disperse the impact, and therefore the impact absorption can be improved compared to the inner cap 301 of the comparative example, in which the contact portion with the head H is linear. Moreover, as shown in Fig. 1 etc., in the inner cap 1 of this embodiment, the ribs 16 can be appropriately provided not only on the edges of each ridge portion but also in the first region 111 of the main body portion 11, and the ribs 16 can be increased to the central portion of the first ridge portion 15 including the apex u1, and the strength and impact absorption can be further improved. In the above explanation, an example was given in which an external impact was applied to the first ridge portions 15, 35 of the inner cap 1 of this embodiment and the conventional inner cap 301, which is a comparative example. However, the same applies when an impact is applied to other ridge-shaped portions between the beam portions 12, 13.

[0032] Here, an example of the inner cap 1 of this embodiment and a comparative example of the conventional inner cap 301 were prepared, and an iron ball was actually dropped on the head to measure the impact load and evaluate the impact absorption properties. Figure 5 is a graph showing the test results of the impact absorption performance of the inner caps of the examples and the comparative examples. In the graph shown in Figure 5, the vertical axis is the impact load [kN], and the horizontal axis is the drop height of the iron ball (height at which the iron ball is dropped) [mm]. This test was carried out in a room temperature environment using the test environment for flying objects and falling objects specified in JIS8131 (2015), and the drop height of the iron ball was also different from the JIS standard.

[0033] The iron ball used in the test was a hemisphere with a radius of 48 mm and a weight of 5.0 kg. The iron ball was dropped from three heights: 50 mm, 100 mm, and 150 mm. In addition, in this test, the inner caps of the examples and comparative examples were made of polypropylene, as an example. As shown in Fig. 5, the inner cap 1 of the embodiment achieved more than twice the shock absorption performance compared to the inner cap 301 of the comparative example. Note that the impact load when an iron ball was dropped from a height of 150 mm on the comparative inner cap 301 was an estimated value because it could have destroyed the human head model. In this test, the inner cap was made of polypropylene, but even when it was made of other resins suitable for the material of the inner cap 1 of this embodiment, such as polyethylene, there was no significant difference in impact load depending on the type of resin.

[0034] Next, a 14 mm thick impact absorbing liner made of polystyrene foam (not shown) was attached to cover the head of the hardwood human head model, and the inner caps of the embodiment and comparative example were attached on top of that. A test was then conducted in which an iron ball was dropped on the top of the head (the area including the vertex u1), and the impact marks left on the impact absorbing liner were observed. This test was carried out at room temperature using the JIS8131 (2015) test environment for flying objects and falling objects. The iron ball used in this test was a hemisphere with a radius of 48 mm, weighed 5.0 kg, and was dropped from a height of 50 mm. The inner caps of the examples and comparative examples were made of polypropylene, similar to those used in the impact load measurement described above.

[0035] At this time, in the inner cap of the embodiment, the inner surface of the first ridge portion 15 came into contact with the impact absorbing liner covering the human head model, and the impact absorbing liner was recessed in a planar shape the width of the first ridge portion 15. In contrast, in the comparative inner cap 301, the rib 36 hit the impact absorbing liner covering the dummy head, and the impact load from the iron ball was concentrated on the rib 36 of the first section 35, so that the rib 36 was linearly dug into the impact absorbing liner. This also shows that if the conventional inner cap 301 serving as the comparative example is worn inside a work hat or the like and receives an external impact from a falling object or the like, the conventional inner cap 301 may injure the head of the wearer.

[0036] Fig. 6 is a schematic diagram showing the inner caps of the example and the comparative example being worn on the head H. Fig. 6(a) shows the inner cap 1 of the embodiment being worn as an example, and Fig. 6(b) shows the conventional inner cap 301 being worn as a comparative example. Fig. 6 shows schematic cross sections of the inner caps of the example and the comparative example, with work caps and the like omitted. The inner cap 1 of the embodiment has improved shock absorption properties by providing the main body 11 with ribs 16 that protrude outward, so that the space between the main body 11 and the beams 12, 13 can be made smaller than that of the inner cap 301 of the comparative example, as shown in Fig. 6. Also, in the inner cap 1 of the embodiment, the outer shape of the inner cap 1 formed by the tip portions of the ribs 16 is substantially the same as that of the conventional inner cap 301 of the comparative example, and the height of the inner cap 1 of the embodiment (the dimension from the bottom end to the uppermost point (+Z side)) is substantially the same as that of the inner cap 301 of the comparative example.

[0037] As a result, in the inner cap 1 of this embodiment, the floating of the inner cap when worn on the head is reduced, improving the wearing comfort, and the amount of protrusion of the inner cap 1 from the head surface can be reduced, compared to the inner cap 301 of the comparative example. In the example shown in Fig. 6, the height when the inner cap 1 of this embodiment is worn is lower by a dimension d than when the inner cap 301 of the comparative example is worn. As a result, according to this embodiment, the sense of unity between the wearer and the work cap is increased, and the work cap can be reduced from getting caught or hit on a ceiling or edge (not shown).

[0038] As described above, according to this embodiment, the edge of the main body 11 on the opening 14 side is formed with a rib 16 that convex outward, and there is no rib that convex inward, so that the inner cap 1 has sufficient strength, can adequately absorb external impacts, and will not injure the wearer's head. Furthermore, according to this embodiment, since a plurality of ribs 16 are formed and arranged in the first region 111 of the main body 11, the impact absorbing properties of the inner cap 1 can be further improved.

[0039] In addition, according to this embodiment, the inner cap 1 can improve its shock absorption properties by providing ribs 16, thereby reducing the space between the beam portions 12, 13 and the main body portion 11, reducing the floating of the inner cap 1 from the head, improving the wearing comfort, and also reducing the amount of protrusion of the inner cap from the head surface.

[0040] (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, in the area defined by the ribs 16, the thickness of the main body 11 may be reduced or an opening may be formed, as long as sufficient strength and the like can be ensured. FIG. 7 is a diagram showing an example of a modified form of the inner cap 1. In FIG. 7 is located within the area defined by the ribs 16. By reducing the thickness of the main body 11 in this area S or forming an opening in this area S, it is possible to reduce the weight of the inner cap 1 while maintaining sufficient strength.

[0041] (2) In this embodiment, a shock absorbing material may be disposed in the area defined by the ribs 16 to improve the shock absorbing properties of the inner cap 1. Fig. 8 is a diagram showing an example of a modified form of the inner cap 1. Fig. 8 shows a perspective view of the modified form of the inner cap 1. As shown in Fig. 8, in the first ridge portion 15 including the apex point u1, the shock absorbing material 21 may be disposed in an area partitioned by the ribs 16 on the outside of the main body portion 11. The first ridge portion 15 has the ribs 16 formed along the edge on the opening 14 side, and further has the ribs 16 extending in the front-rear direction formed in the center of the left-right direction of the first ridge portion 15, but the number of the ribs 16 extending in the left-right direction and arranged in the front-rear direction is fewer than that of the inner cap 1 shown in Fig. 1. In the inner cap 1 of the modified form shown in Fig. 8, the number of ribs 16 formed in the first ridge portion 15 is reduced compared to the inner cap 1 shown in the above-mentioned embodiment, but sufficient shock absorption can be achieved by disposing the shock absorbing material 21. For example, polystyrene foam, urethane, etc. are suitable as the impact absorbing material 21. Also, ribs 16 similar to those of the inner cap 1 of the above embodiment may be provided, and the impact absorbing material may be disposed in the compartments formed by the ribs 16 without reducing the number of ribs 16.

[0042] (3) In the present embodiment, the inner cap 1 is attached to a work hat. However, the present invention is not limited to this. For example, the inner cap 1 may be attached to a dust hood or the like.

[0043] (4) In this embodiment, ribs 16 for improving strength may also be formed on the beams 12, 13. For example, ribs 16 may be formed on both ends of the beams 12, 13 in the short side direction, or a rib 16 extending in the longitudinal direction may be provided in the center of the beams 12, 13 in the short side direction. By adopting such a configuration, the strength of the beams 12, 13 can be improved.

[0044] (5) In the present embodiment, an example in which a total of four beams 12, 13 are formed has been shown, but this is not limited to the example, and the number may be increased. In addition, the beams 12, 13 are not limited to the example shown in the above embodiment, and the arrangement direction, etc., of the beams 12, 13 may be appropriately selected.

[0045] The present invention is not limited to the above-described embodiments and modifications, and the present invention may be combined in any suitable manner. [Explanation of symbols]

[0046] 1 Inner cap 11 Main body 12,12A,12B beam part 13,13A,13B Beam section 14 Openings 15 Building 1 16 Ribs 17 Cutout 18 holes

Claims

1. A hemispherical main body portion that covers the wearer's head; A plurality of beam portions are formed integrally with the main body portion, are located on the inside of the main body portion, and are provided in a first region corresponding to the top side of the wearer's head; a plurality of openings formed between the plurality of beam portions and the main body portion; a rib formed along at least an edge of the main body portion on the opening side and protruding outward; An inner cap comprising:

2. The ribs are further formed and arranged in a plurality in the first region. The inner cap according to claim 1 .

3. A shock absorbing material is disposed on at least a part of an area on the outside of the main body portion and in the vicinity of the top of the head. The inner cap according to claim 1 .

4. The ribs are formed in a plurality in the first region, The portion partitioned by the plurality of ribs has a smaller thickness than the other portion of the main body, or has an opening formed therein. The inner cap according to claim 1 .

5. The main body and the beam are not formed with a linear or dot-like shape that is convex inward. The inner cap according to claim 1 .

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