Protective cap

Abstract

To provide a protective cap which can be made small in height when folded, has a simple structure, and can be manufactured in a simplified process.SOLUTION: There is provided a protective cap 1 including: a lower cap body constituent 15 constituting a lower portion of a bowl-shaped cap body 3; an upper cap body constituent 17 constituting an upper portion of the bowl-shaped cap body 3; and a hinge portion constituent 11 which is rotatably engaged with a predetermined portion 21 of the lower cap body constituent 15 at a predetermined portion 19 and is rotatably engaged with a predetermined portion 25 of the upper cap body constituent 17 at another predetermined portion 23. The upper cap body constituent 17 and the hinge portion constituent 11 move relative to the lower cap body constituent 15 between a state in which the lower cap body constituent 15 and the upper cap body constituent 17 form the bowl-shaped cap body 3 and a state in which the upper cap body constituent 17 and the hinge portion constituent 11 are housed in the lower cap body constituent 15.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to protective helmets, and in particular to those that can be folded for storage. [Background technology]

[0002] A problem with ordinary helmets (protective headgear) is that they are too bulky and large when stored, making them inconvenient to carry. To solve this problem, various folding helmets, such as those that can be folded vertically or horizontally, have been developed and are widely available.

[0003] Among them, the type that can be folded vertically is easy to maintain the necessary strength for the helmet body, and can also satisfy the safety standards for protective helmets (for protection against falling objects or falls). The following types of helmets that can be folded vertically are known:

[0004] Conventionally, a protective cap is known in which the cap body is divided into two parts, and the upper part of the cap body rotates around a hinge at the forehead and is stored in the lower part of the cap body (see Patent Document 1). Also, a protective cap is known in which the cap body is divided into three or more parts, and the upper part of the cap body and multiple middle parts of the cap body rotate around a rotation axis at the forehead and are stored in the lower part of the cap body (see Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 2-122033 [Patent Document 2] Patent No. 5949666 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, in the above-mentioned type of helmet that can be folded in the vertical direction, the divided bodies (shell components) formed by dividing the shell into two are connected to each other by a rotating shaft, so it is difficult to reduce the height dimension when folded. Also, in the above-mentioned type of helmet that can be folded in the vertical direction, the divided bodies (shell components) formed by dividing the shell must be connected to each other by multiple rotating shafts or multiple connecting bodies. This makes the structure complicated and increases the number of steps required for manufacturing.

[0007] An object of the present invention is to provide a protective cap which can be folded to a small height, has a simple structure, and can be manufactured in a simplified process. [Means for solving the problem]

[0008] The protective cap according to one aspect of the present invention has a lower cap body component constituting the lower part of a bowl-shaped cap body, an upper cap body component constituting the upper part of the bowl-shaped cap body, and a hinge part component that rotatably engages with a predetermined part of the lower cap body component at a predetermined part and rotatably engages with a predetermined part of the upper cap body component at another predetermined part, and is configured so that the upper cap body component and the hinge part component move relative to the lower cap body component between a state in which the bowl-shaped cap is formed by the lower cap body component and the upper cap body component and a state in which the upper cap body component and the hinge part component are stored within the lower cap body component.

[0009] In a protective cap according to one embodiment of the present invention, the lower cap body component and the upper cap body component are configured in such a manner that the bowl-shaped cap body is divided into two parts by a plane that includes the central portion of the bowl-shaped cap body and is perpendicular to the height direction of the bowl-shaped cap body, and the hinge portion component engages with the lower cap body component at a front end portion of the lower cap body component and engages with the upper cap body component at a front end portion of the upper cap body component, or the hinge portion component engages with the lower cap body component at a rear end portion of the lower cap body component and engages with the upper cap body component at a rear end portion of the upper cap body component.

[0010] In a protective cap according to this aspect of the present invention, a headband is provided on the bowl-shaped cap body, and the upper cap body constituent and the hinge portion constituent are configured to be stored within the lower cap body constituent without being obstructed by the headband.

[0011] In the protective cap according to this aspect of the present invention, a predetermined portion of the hinge portion constituent is provided at a lower end of the hinge portion constituent, a predetermined portion of the lower cap body constituent with which the hinge portion constituent engages is provided at a front end of the lower cap body constituent in the front-rear direction and at an upper end of the lower cap body constituent in the up-down direction, another predetermined portion of the hinge portion constituent is provided at an upper end of the hinge portion constituent, a predetermined portion of the upper cap body constituent with which the hinge portion constituent engages is provided at a front end of the upper cap body constituent in the front-rear direction and at a lower end of the upper cap body constituent in the up-down direction, When the state transitions from one in which the lower cap body component and the upper cap body component are stored in the lower cap body component to one in which the bowl-shaped cap is formed by the lower cap body component and the upper cap body component, the upper cap body component tilts relative to the lower cap body component so that the rear portion of the upper cap body component is on the lower side and the front portion is on the upper side, and a part of the upper cap body component protrudes downward from the lower end of the lower cap body component, and then the upper cap body component moves upward until another part of the upper cap body component protrudes upward from the upper end of the lower cap body component, and then the tilt of the upper cap body component is eliminated to form the bowl-shaped cap.

[0012] In the protective cap according to this aspect of the present invention, a predetermined portion of the hinge portion constituent is provided in a pair symmetrically, a predetermined portion of the lower cap body constituent with which the hinge portion constituent engages is also provided in a pair symmetrically, another predetermined portion of the hinge portion constituent is also provided in a pair symmetrically, a predetermined portion of the upper cap body constituent with which the hinge portion constituent engages is also provided in a pair symmetrically, and the lower cap body constituent is provided with a locking portion, The upper hat body component is provided with an interlocking portion, and the interlocking portion is configured to be engaged with the engaging portion so that the state in which the lower hat body component and the upper hat body component form the bowl-shaped hat body is maintained, and the engaging portions are provided in a pair symmetrically on the left and right, and the interlocking portions are also provided in a pair symmetrically on the left and right. Effect of the Invention

[0013] According to the present invention, it is possible to provide a protective cap that can be made small in height when folded, has a simple structure, and can be manufactured in a simplified process. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of a protective cap according to a first embodiment of the present invention (protective cap in use). [Diagram 2] FIG. 1 is a perspective view of a protective cap according to a first embodiment of the present invention (protective cap in use). [Diagram 3] FIG. 1 is a perspective view of a protective cap according to a first embodiment of the present invention (protective cap in use). [Figure 4] 4 is a view taken along the arrow IV in FIG. [Diagram 5] FIG. 2 is a diagram showing a cross section taken along the line VV in FIG. [Figure 6] FIG. 6 is a view corresponding to FIG. 5 and is a cross-section of the protective cap (protective cap in a stored state) according to the first embodiment of the present invention. [Figure 7] FIG. 6 is an enlarged view of part VII in FIG. [Figure 8] FIG. 6 is an enlarged view of a portion VIII in FIG. [Figure 9] 5A to 5C are diagrams illustrating the operation of the protective cap according to the first embodiment of the present invention when it is shifted from a stored state to a used state. [Figure 10] 5A to 5C are diagrams illustrating the operation of the protective cap according to the first embodiment of the present invention when it is shifted from a stored state to a used state. [Figure 11]5A to 5C are diagrams illustrating the operation of the protective cap according to the first embodiment of the present invention when it is shifted from a stored state to a used state. [Figure 12] 1A and 1B are diagrams showing the locked portion and the locking portion of the protective cap according to the first embodiment of the present invention, (b) is a view taken along the line XIIB in (a), and (c) and (d) are diagrams corresponding to (a) and showing the operation of the locked portion and the locking portion. [Figure 13] FIG. 2 is a perspective view of a lower helmet body component that constitutes a bowl-shaped helmet body of the protective helmet according to the first embodiment of the present invention. [Figure 14] 14 is a view taken along the arrow XIV in FIG. 13. [Figure 15] 14 is a view taken along the arrow XV in FIG. 13. [Figure 16] FIG. 2 is a perspective view of an upper helmet body component that constitutes a bowl-shaped helmet body of the protective helmet according to the first embodiment of the present invention. [Figure 17] FIG. 2 is a perspective view of an upper helmet body component that constitutes a bowl-shaped helmet body of the protective helmet according to the first embodiment of the present invention. [Figure 18] FIG. 2 is a perspective view of an upper helmet body component that constitutes a bowl-shaped helmet body of the protective helmet according to the first embodiment of the present invention. [Figure 19] 19 is a view taken along the arrow XIX in FIG. 16. [Figure 20] 17 is a view taken along the arrow XX in FIG. 16. [Figure 21] FIG. 2 is a perspective view of a hinge portion constituent of the protective cap according to the first embodiment of the present invention. [Figure 22] FIG. 2 is a perspective view of a hinge portion constituent of the protective cap according to the first embodiment of the present invention. [Diagram 23] 23 is a view taken along the arrow XXIII in FIG. 21. [Figure 24] 24 is a view taken along the arrow XXIV in FIG. 21. [Diagram 25] 22 is a view taken along the arrow XXV in FIG. 21. [Figure 26] 26 is a view taken along the arrow XXVI in FIG. 21. [Figure 27] FIG. 11 is a perspective view of a protective cap according to a second embodiment of the present invention (protective cap in use). [Figure 28]FIG. 11 is a perspective view of a protective cap according to a second embodiment of the present invention (protective cap in use). [Figure 29] FIG. 11 is a perspective view of a protective cap according to a second embodiment of the present invention (protective cap in use). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] [First embodiment] 1 to 6, a protective cap (helmet; for example, an industrial helmet) 1 according to a first embodiment of the present invention is configured to include a cap body 3, a hammock 5, an impact absorbing liner 7, a headband 9, and a hinge portion constituent body 11. Note that a line CL1 indicating the center of the protective cap 1 shown in Fig. 1 etc. does not appear in the actual product.

[0016] Here, a specific direction in the protective cap 1 is defined as the left-right direction, a specific direction perpendicular to the left-right direction is defined as the front-rear direction, and a direction perpendicular to the left-right direction and the front-rear direction is defined as the up-down direction (height direction). The left-right direction, front-rear direction, and up-down direction are directions as seen by a person wearing the protective cap. The left-right direction is the direction connecting the left end and right end of the cap body, and the front-rear direction is the direction connecting the front end and rear end of the cap body. The up-down direction is the direction connecting the center of the opening at the bottom end of the cap body and the top of the cap body. Moreover, the left-right direction and the front-rear direction are, for example, horizontal directions.

[0017] The cap body 3 is formed of a material such as a hard synthetic resin having a rigidity that can be regarded as a rigid body, and is formed into a bowl shape with a predetermined thickness.

[0018] The cap body 3 is formed in a bowl shape. Since the cap body 3 is formed in a bowl shape, the cap body 3 is formed in a roughly hemispherical shell shape. Since the cap body 3 is formed in a hemispherical shell shape, an annular opening (a roughly circular opening) 13 is formed at the lower end of the cap body 3.

[0019] A hemispherical shell shape is one of two solid shapes obtained when a spherical shell shape solid is formed by removing a second sphere of a specified radius from a first sphere of a specified radius, and then divided by a specified plane. The radius of the second sphere is slightly smaller than the radius of the first sphere, and the centers of the first sphere and the second sphere are coincident with each other. The specified plane includes the centers of the first sphere and the second sphere.

[0020] Furthermore, the cap body 3 has an appropriate shape according to the shape of a person's head. That is, the cap body 3 is not formed in a perfect hemispherical shell shape, but is formed in a hemispherical shell shape close to the shape of a hemispherical shell.

[0021] The cap body 3 is configured to include a lower cap body constituent (cap body lower part) 15 and an upper cap body constituent (cap body upper part) 17. The lower cap body constituent 15 constitutes the lower part of the cap body 3, and the upper cap body constituent 17 constitutes the upper part of the cap body. The lower cap body constituent 15 is provided with a visor 27. The visor 27 protrudes forward from the front end part of the opening 13 of the cap body 3.

[0022] The hinge part constituent 11 is rotatably engaged at a predetermined portion (lower cap body engaging portion) 19 with a predetermined portion (first hinge part constituent engaging portion) 21 of the lower cap body constituent 15. In addition, the hinge part constituent 11 is rotatably engaged at another predetermined portion (upper cap body engaging portion) 23 with a predetermined portion (second hinge part constituent engaging portion) 25 of the upper cap body constituent 17.

[0023] The lower cap body component 15 and the upper cap body component 17 are engaged with each other via the hinge component 11, so that the upper cap body component 17 and the hinge component 11 are configured to move relative to the lower cap body component 15 between the usage state (cap body formed state) and the storage state.

[0024] The use state is a state in which the bowl-shaped cap body 3 is formed by the lower cap body constituent 15 and the upper cap body constituent 17, as shown in Fig. 1, Fig. 5, etc. The stored state is a state in which the upper cap body constituent 17 and the hinge part constituent 11 are stored in the lower cap body constituent 15, as shown in Fig. 6. The movement of the upper cap body constituent 17 and the hinge part constituent 11 described above includes not only parallel movement but also rotation that changes the posture.

[0025] 1 etc., the hinge constituent 11 does not particularly protrude from the outer convex surface of the cap body 3 when in use. That is, when in use, the external appearance of the protective cap 1 looks as if the hinge constituent 11 does not exist.

[0026] Moreover, even in a use state, a storage state, or a state between the use state and the storage state (a state in the middle of transition), the lower cap body component 15, the upper cap body component 17, and the hinge portion component 11 continue to be engaged with each other. That is, the lower cap body component 15, the upper cap body component 17, and the hinge portion component 11 are configured not to separate from each other.

[0027] The lower cap body component 15 and the upper cap body component 17 are formed in such a manner that the bowl-shaped cap body 3 is divided into two parts by a plane that includes the central portion of the bowl-shaped cap body 3 and is perpendicular to the height direction of the bowl-shaped cap body 3.

[0028] That is, the lower cap body constituent 15 consists of the lower part of the bowl-shaped cap body 3 when the bowl-shaped cap body 3 is divided along a predetermined plane. The upper cap body constituent 17 consists of the upper part of the bowl-shaped cap body 3 when the bowl-shaped cap body 3 is divided along the predetermined plane. The predetermined plane is a plane perpendicular to the up-down direction (a plane extending in the horizontal direction). Moreover, the predetermined plane is located in the center (the center or near the center) of the bowl-shaped cap body 3 in the up-down direction.

[0029] As a result, the lower cap body constituent 15 is spherical (shaped like a curved portion of a spherical band), and the upper cap body constituent 17 is spherical crown (shaped like a curved portion of a spherical crown). The height dimension value of the lower cap body constituent 15 is slightly larger than half the height dimension value of the bowl-shaped cap body 3. For example, the height dimension value of the lower cap body constituent 15 is about 50.1% to 60% (preferably 51% to 55%, more preferably 51% to 53%, even more preferably 51.5% to 52.5%, and even more preferably 52%) of the height dimension value of the bowl-shaped cap body 3.

[0030] The hinge part constituent 11 is engaged with the lower cap body constituent 15 at a front end portion of the lower cap body constituent 15, and is engaged with the upper cap body constituent 17 at a front end portion of the upper cap body constituent 17. Note that the hinge part constituent 11 may be configured to be engaged with the lower cap body constituent 15 at a rear end portion of the lower cap body constituent 15, and to be engaged with the upper cap body constituent 17 at a rear end portion of the upper cap body constituent 17.

[0031] When the cap body 3 transitions from a use state to a storage state, and from the storage state to a use state, the hinge portion constituent 11 is adapted to rotate around a predetermined axis extending in the left-right direction relative to the lower cap body constituent 15.

[0032] When the cap body 3 transitions from a use state to a storage state, and from the storage state to a use state, the upper cap body constituent 17 is adapted to rotate around a predetermined axis extending in the left-right direction relative to the hinge portion constituent 11.

[0033] In addition, when the cap body 3 transitions from a use state to a storage state, or from the storage state to a use state, the upper cap body constituent 17 is adapted to rotate (turn) about a predetermined axis extending in the left-right direction relative to the lower cap body constituent 15. Furthermore, when the cap body 3 transitions from a use state to a storage state, or from the storage state to a use state, the upper cap body constituent 17 is adapted to move parallel to the lower cap body constituent 15 in the front-rear and up-down directions in addition to the above-mentioned rotation.

[0034] When the stored state is viewed in the left-right and front-back directions, only the lower cap body component 15 is visible, and the upper cap body component 17 and the hinge portion component 11 stored inside the lower cap body component 15 are not visible.

[0035] A hammock 5, a headband 9, and an impact absorbing liner 7 are provided inside the bowl-shaped cap body 3, and the headband 9 is supported by a lower cap body component 15 and is provided on the lower cap body component 15 within the lower cap body component 15. In addition, an end of a chin strap (not shown) is fixed to a portion on the inner surface of the cap body 3 (lower cap body component 15) near the opening 13.

[0036] In the protective cap 1, the upper cap body constituent 17 and the hinge portion constituent 11 are configured to be stored within the lower cap body constituent 15 without being hindered by the hammock 5, the impact absorbing liner 7, the headband 9, and the chin strap.

[0037] In the stored state, in addition to the upper cap body component 17, the hinge component 11, and the headband 9, the hammock 5, the impact absorbing liner 7, and the chin strap are also configured to be accommodated within the lower cap body component 15.

[0038] That is, when the stored state is viewed in the left-right and front-back directions, only the lower helmet body constituent 15 is visible, and the upper helmet body constituent 17, the hinge portion constituent 11, the shock absorbing liner 7, the headband 9, etc., inside the lower helmet body constituent 15, are not visible. When the stored state is viewed in the left-right and front-back directions, a part of the headband 9 and a part of the chin strap protrude from the lower helmet body constituent 15, but the headband 9 and the chin strap are designed to be easily deformed by applying only a slight force. Therefore, when the protective helmet 1 in the stored state is placed in a bag or the like, the headband 9 and the chin strap are easily deformed and fit within the lower helmet body constituent 15.

[0039] The hammock 5 and the impact absorbing liner 7 are provided to the upper cap body constituent 17 within the upper cap body constituent 17. When the upper cap body constituent 17 is viewed in the left-right and front-back directions, only the upper cap body constituent 17 is visible, and the hammock 5 and the impact absorbing liner 7 inside the upper cap body constituent 17 are not visible.

[0040] The lower cap body component engaging portion 19 of the hinge part component 11 is provided at the lower end portion of the hinge part component 11. The first hinge part component engaging portion 21 of the lower cap body component 15 with which the hinge part component 11 engages is provided at the front end portion of the lower cap body component 15 in the front-to-rear direction and is provided at the upper end portion of the lower cap body component 15 in the up-down direction.

[0041] The upper cap body component engaging portion 23 of the hinge part component 11 is provided at the upper end portion of the hinge part component 11. The second hinge part component engaging portion 25 of the upper cap body component 17, with which the hinge part component 11 engages, is provided at the front end portion of the upper cap body component 17 in the front-to-rear direction, and is provided at the lower end portion of the upper cap body component 17 in the up-down direction.

[0042] When transitioning from the stored state to the use state, as shown in Fig. 9 etc., the upper cap body constituent 17 is tilted with respect to the lower cap body constituent 15, and a part (lower rear part) of the upper cap body constituent 17 protrudes downward from the lower end of the lower cap body constituent 15. In the state in which the upper cap body constituent 17 is tilted, the rear part of the upper cap body constituent 17 is on the lower side and the front part is on the upper side.

[0043] After this, the upper cap body constituent 17 moves upward until another part (upper front part) of the upper cap body constituent 17 protrudes upward from the upper end of the lower cap body constituent 15 (see FIG. 11, etc.). After this, the inclination of the upper cap body constituent 17 is eliminated, so that the bowl-shaped cap body 3 is formed (see FIG. 5, etc.).

[0044] When transitioning from the use state to the storage state, the opposite operation to that when transitioning from the storage state to the use state is performed. That is, the upper cap body constituent 17 is inclined with respect to the lower cap body constituent 15, a part of the upper cap body constituent 17 (upper front part) protrudes upward from the upper end of the lower cap body constituent 15, and the remaining part of the upper cap body constituent 17 enters the lower cap body constituent 15.

[0045] After this, the upper cap body constituent 17 moves downward until a part (lower rear part) of the upper cap body constituent 17 protrudes downward from the lower end of the lower cap body constituent 15. After this, the upper cap body constituent 17 is configured to be stored in the lower cap body constituent 15 by eliminating the inclination of the upper cap body constituent 17.

[0046] As shown in Fig. 13, Fig. 21, etc., the lower cap body component engaging portion 19 of the hinge part component 11 is provided in a pair symmetrically on the left and right. The first hinge part component engaging portion 21 of the lower cap body component 15, with which the hinge part component 11 engages, is also provided in a pair symmetrically on the left and right. As shown in Fig. 16, Fig. 21, etc., the upper cap body component engaging portion 23 of the hinge part component 11 is also provided in a pair symmetrically on the left and right. The second hinge part component engaging portion 25 of the upper cap body component 17, with which the hinge part component 11 engages, is also provided in a pair symmetrically on the left and right.

[0047] 1 and other drawings, the lower cap body constituent 15 is provided with a locking portion 29, and the upper cap body constituent 17 is provided with a locked portion 31. The locked portion 31 is locked to the locking portion 29, so that the lower cap body constituent 15 and the upper cap body constituent 17 maintain the state in which they form a bowl-shaped cap body 3.

[0048] Here, the protective cap 1 will be described in more detail. The protective cap 1 is formed symmetrically. As shown in Fig. 13, Fig. 14, etc., the first hinge portion constituent engagement portion 21 of the lower cap body constituent 15 is provided at the front end portion of the lower cap body constituent 15 in the front-rear direction. The first hinge portion constituent engagement portion 21 is provided at the upper end portion of the lower cap body constituent 15 in the up-down direction. The first hinge portion constituent engagement portion 21 has a predetermined dimension in the left-right direction and is symmetrical.

[0049] Moreover, the first hinge component engagement site 21 is configured to include a pair of small protrusions 33. The protrusions 33 are configured to include a flat plate-shaped portion 35 and a low cylindrical portion 37. The thickness direction of the flat plate-shaped portion 35 is the left-right direction. The height direction of the cylindrical portion 37 is the left-right direction, and protrudes from one surface of the flat plate-shaped portion 35 in the thickness direction.

[0050] The pair of protrusions 33 are spaced apart by a predetermined distance in the left-right direction. The cylindrical portion 37 provided on each of the pair of protrusions 33 protrudes outward from each of the pair of protrusions 33. That is, the cylindrical portion 37 of one of the pair of protrusions 33 protrudes from the surface opposite to the other of the pair of protrusions 33. The cylindrical portion 37 of the other of the pair of protrusions 33 protrudes from the surface opposite to the one of the pair of protrusions 33.

[0051] 13, 14, 15, 8, etc., the lower cap body constituent 15 is provided with a rib (lower cap body constituent rib) 39. The lower cap body constituent rib 39 is formed in a ring shape ("C"-shaped or "U"-shaped when viewed in the vertical direction) with a predetermined thickness (almost the same thickness as the thickness of the shell of the lower cap body constituent 15) and a predetermined small width, with a portion cut out.

[0052] The thickness direction of the lower cap body constituent rib 39 is the up-down direction. The lower cap body constituent rib 39 protrudes from the edge of the opening 13 at the upper end of the lower cap body constituent 15 toward the center of the lower cap body constituent 15. This protruding direction is the width direction of the lower cap body constituent rib 39.

[0053] In addition, the lower hat body component rib 39 is provided in a portion of the lower hat body component 15 other than where the first hinge portion component engagement portion 21 is provided, and as described above, is formed in a "C" shape or a "U" shape when viewed in the vertical direction.

[0054] 1, 3, etc., only one locking portion 29 is provided on the lower cap body constituent 15. The locking portion 29 is provided at the upper end portion of the lower cap body constituent 15 in the up-down direction, at the rear end portion in the front-rear direction, and at the center portion in the left-right direction.

[0055] 12 and 13, the locking portion 29 is configured to include a recess 41 and an arm portion 43. The arm portion 43 is configured to include an arm portion main body portion 45 and a locking claw 47. The locking claw 47 is formed with an inclined surface 49 and a locking surface 51.

[0056] The recess 41 is formed in a rectangular flat plate shape, the thickness direction is approximately in the front-rear direction, and is recessed forward from the rear end surface of the lower cap body constituent 15. A rectangular through-hole 53 is provided in a bottom wall 55 of the recess 41. The through-hole 53 is provided at the upper end of the bottom wall 55 in the up-down direction, and at the center of the bottom wall 55 in the left-right direction.

[0057] The arm body 45 is formed in a rectangular flat plate shape similar to the recess 41. The thickness direction of the arm body 45 is approximately in the front-rear direction, and the arm body 45 is provided on the lower cap component 15 so as to just fill the recess 41. The lower end of the arm body 45 is fixed to the lower cap component 15. This allows the arm body 45 to bend in a cantilever manner.

[0058] Locking claw 47 has a shape of a square pillar with an inclined surface 49, and protrudes forward from the front surface of arm main body 45. Locking claw 47 is provided at the upper end of arm main body 45 in the up-down direction, and at the center of arm main body 45 in the left-right direction.

[0059] When the cap body is changed from the stored state to the use state, as shown in Fig. 12(d), the upper cap body constituent 17 moves upward relative to the lower cap body constituent 15. Then, as shown in Fig. 12(c), the upper cap body constituent rib 57 of the upper cap body constituent 17 abuts against the inclined surface 49 of the locking claw 47 of the arm portion 43, so that the arm portion main body 45 is elastically deformed backward.

[0060] When the upper cap body constituent 17 moves further upward relative to the lower cap body constituent 15, the upper cap body constituent 17 climbs over the locking claw 47 of the arm portion 43, and the arm portion main body portion 45 is restored as shown in Fig. 12(a). Then, the locking claw 47 enters the through hole 53, and the lower surface of the upper cap body constituent rib 57 of the upper cap body constituent 17 abuts against the locking surface 51 of the locking claw 47, and the lower surface of the lower cap body constituent rib 39 abuts against the upper surface of the upper cap body constituent rib 57. Then, the upper cap body constituent rib 57 is sandwiched between the lower cap body constituent rib 39 and the locking claw 47, and the locked portion 31 of the upper cap body constituent 17 is locked to the locking portion 29 of the lower cap body constituent 15.

[0061] Incidentally, a part of the upper cap body constituent rib 57 constitutes the locked portion 31 of the upper cap body constituent 17. The upper cap body constituent rib 57 will be described later in detail.

[0062] As shown in Fig. 16 to Fig. 20, the second hinge part constituent engagement part 25 of the upper cap body constituent 17 is provided at the front end part of the upper cap body constituent 17 in the front-rear direction. The second hinge part constituent engagement part 25 is provided at the upper end part of the upper cap body constituent 17 in the up-down direction, and is provided at the center part of the upper cap body constituent 17 in the left-right direction. The second hinge part constituent engagement part 25 is formed symmetrically and is configured with a pair of recesses 59. The recesses 59 are recessed from the outer surface of the upper cap body constituent 17 toward the inside of the upper cap body constituent 17. In addition, the pair of recesses 59 are separated from each other by a predetermined distance in the left-right direction. The part of the upper cap body constituent 17 where the recesses 59 are formed has a predetermined thickness, similar to the part of the upper cap body constituent 17 where the recesses 59 are not formed.

[0063] A part of the surface of the recess 59 is a flat surface 61 perpendicular to the left-right direction. Each flat surface 61 has a cylindrical through hole 63 formed therein.

[0064] Moreover, the second hinge part component engagement site 25 is configured to include a recess 60. The recess 60 is provided at the lower end of the upper cap body component 17 in the up-down direction, at the front end of the upper cap body component 17 in the front-rear direction, and is provided from one recess 59 to the other recess 59 in the left-right direction.

[0065] As shown in Fig. 16 to Fig. 20, the upper cap body constituent 17 is provided with a rib (upper cap body constituent rib) 57. The upper cap body constituent rib 57 is formed in a ring shape (C-shaped or U-shaped when viewed in the vertical direction) with a predetermined thickness (almost the same thickness as the shell thickness of the upper cap body constituent 17) and a predetermined small width, with a part cut out. The thickness direction of the upper cap body constituent rib 57 is the vertical direction. The upper cap body constituent rib 57 protrudes from the edge of the opening at the lower end of the upper cap body constituent 17 to the outside of the upper cap body constituent 17. This protruding direction is the width direction of the upper cap body constituent rib 57.

[0066] In addition, the upper hat body component rib 57 is provided in a portion of the upper hat body component 17 other than where the second hinge portion component engagement portion 25 is provided, and as described above, is formed in a "C" shape or a "U" shape when viewed in the vertical direction.

[0067] 21 to 26, the hinge portion constituent 11 includes a pair of hinge main bodies 65 and a connecting portion 67 connecting the pair of hinge main bodies 65, and is formed symmetrically. The pair of hinge main bodies 65 are spaced apart from each other by a predetermined distance in the left-right direction. The hinge main body 65 is formed in a plate shape having the largest dimension in the left-right direction, the next largest dimension in the up-down direction, and the smallest dimension in the front-rear direction.

[0068] The connecting portion 67 is provided in the front-rear direction at the front end portion of the pair of hinge main bodies 65. The connecting portion 67 is provided in the middle portion of the pair of hinge main bodies 65 in the up-down direction, and extends in the left-right direction from one of the pair of hinge main bodies 65 to the other of the pair of hinge main bodies 65.

[0069] Moreover, the hinge part constituent 11 is provided with a cylindrical through hole 69 and a cylindrical protrusion 71. The through hole 69 is provided in each of the pair of hinge main parts 65 at the lower end of the hinge main part 65 (a part below the connecting part 67), and penetrates the hinge main part 65 in the left-right direction.

[0070] The protrusions 71 are provided on each of the pair of hinge main bodies 65 at the upper end of the hinge main bodies 65 (a portion above the connecting portion 67). Each of the pair of protrusions 71 protrudes inward from each of the hinge main bodies 65. That is, the protrusion 71 protruding from one of the pair of hinge main bodies 65 protrudes toward the other of the pair of hinge main bodies 65. Furthermore, the protrusion 71 protruding from the other of the pair of hinge main bodies 65 protrudes toward the one of the pair of hinge main bodies 65.

[0071] In a state where the hinge portion constituent 11 is installed on the lower cap body constituent 15 and the upper cap body constituent 17, the lower end portions of the pair of hinge main body portions 65 contact the pair of flat plate-like portions 35, respectively, and sandwich the pair of flat plate-like portions 35 in the left-right direction (see FIG. 3, etc.). Also, the pair of cylindrical portions 37 are inserted into the pair of through holes 69, respectively. This allows the hinge portion constituent 11 to only rotate with respect to the lower cap body constituent 15 around an axis that extends in the left-right direction and includes the central axis of the cylindrical portions 37 and the through holes 69.

[0072] Moreover, in a state where the hinge part constituent 11 is installed on the lower cap body constituent 15 and the upper cap body constituent 17, the upper end portions of the pair of hinge main bodies 65 are in contact with the pair of flat surfaces 61, respectively (see FIG. 1). Then, a portion of the upper cap body constituent 17 located between the pair of flat surfaces 61 is sandwiched. As a result, the lower cap body constituent 15 is only allowed to rotate with respect to the hinge part constituent 11 around an axis that extends in the left-right direction and includes the central axis of the protrusion 71 and the through-hole 63.

[0073] When the protective cap 1 is in use, as shown in Figures 1, 3, 5, etc., a portion of the hinge part constituent 11 below the connecting part 67 is contained within the lower cap body constituent 15. Also, a portion of the hinge part constituent 11 above the connecting part 67, including the connecting part 67, is contained in a state in which it is just fitted into the recesses 59, 60 of the upper cap body constituent 17.

[0074] As a result, in the used state, the hinge constituent 11 does not particularly protrude from the outer convex surface of the cap body 3. In other words, in the used state, the external appearance of the protective cap 1 is such that the hinge constituent 11 does not exist.

[0075] When the protective cap 1 is in use, as shown in Fig. 5 and Fig. 7, the longitudinal direction of the hinge body 65 of the hinge part constituent 11 is generally in the vertical direction. Also, as shown in Fig. 12(a), the rear end of the upper cap body constituent rib 57 of the upper cap body constituent 17 is sandwiched between the locking claw 47 and the lower cap body constituent rib 39 in the vertical direction. Furthermore, as shown in Fig. 8, the rear end surface 73 of the upper cap body constituent rib 57 of the upper cap body constituent 17 abuts against a wall portion 75 made of a slightly hard friction reducing material of the impact absorbing liner 7 provided on the lower cap body constituent 15. Note that the locking portion 29 is omitted in Fig. 8. Therefore, Fig. 8 may be interpreted as a cross section slightly shifted to the right or left from directly behind, rather than a cross section directly behind the lower cap body constituent 15 or the upper cap body constituent 17.

[0076] As a result, when the protective cap 1 is in use, the upper cap body component 17 and the hinge portion component 11 are fixed to the lower cap body component 15, and the upper cap body component 17 cannot move relative to the lower cap body component 15.

[0077] As shown in Figure 6, when the protective cap 1 is in the stored state, the state in which the upper cap body component 17 is contained within the lower cap body component 15 is generally maintained for the following reasons.

[0078] The upper cap body component 17 is prevented from moving upward relative to the lower cap body component 15 because the hinge main body 65 of the hinge part component 11 extends generally in the vertical direction, as shown in Fig. 6. The upper cap body component 17 is prevented from moving downward relative to the lower cap body component 15 because the upper cap body component 17 is interfered with by the headband 9, as shown in Fig. 6. In addition, by bringing the rear part of the upper cap body component 17 into contact with the recess 79 of the impact absorbing liner 7B and bringing the front part of the upper cap body component 17 into contact with the headband 9, the movement of the upper cap body component 17 in the front-rear direction can be suppressed to some extent.

[0079] In addition, the protective cap described in Japanese Utility Model Application Laid-Open Publication No. 2-122033 does not have a mechanism for stopping the upper part of the cap when stored, so there is a risk that the upper part of the cap may rotate too much when stored and the hinge may break.

[0080] The impact absorbing liner 7, as shown in Fig. 3, Fig. 5, etc., is provided on both the upper cap body constituent 17 and the lower cap body constituent 15. The impact absorbing liner 7 (7A) provided on the upper cap body constituent 17 is formed in a bowl shape of a predetermined thickness from, for example, polystyrene foam, and is installed on the upper cap body constituent 17 so as to cover the entire concave inner surface of the upper cap body constituent 17.

[0081] The impact absorbing liner 7 (7B) provided on the lower cap body constituent 15 is configured to include a portion 77 formed of, for example, polystyrene foam, and a wall portion 75 formed of a friction reducing material. The wall portion 75 has a predetermined thickness and covers the portion 77. In other words, the portion 77 is surrounded by the lower cap body constituent 15 and the wall portion 75 and is disposed in a space.

[0082] The impact absorbing liner 7 (7B) is provided in the front-rear direction at the rear end of the concave inner surface of the lower cap body component 15, for example, avoiding the locking portion 29. The impact absorbing liner 7 (7B) is provided over the entire lower cap body component 15 in the up-down direction. The impact absorbing liner 7 (7B) is provided at the rear end of the lower cap body component 15 with a predetermined width in the left-right direction.

[0083] A recess 79 is formed at the lower end of the impact absorbing liner 7 (7B) by recessing the wall portion 75 toward the rear. The recess 79 has a shape similar to the shape of a part of the outer surface of the upper shell constituent body 17 (concave curved surface).

[0084] The hammock 5 is made of, for example, a synthetic resin that stretches to a certain extent, and is configured to have a ring-shaped central portion 81 and a plurality of (for example, four) legs 83 extending radially from the central portion 81, as shown in FIG. 2 etc. Each tip of the legs 83 is fixed to the upper helmet body component 17 in the vicinity of the edge of the opening of the upper helmet body component 17. The hammock 5 is slightly separated from the impact absorbing liner 7 (7A), but the hammock 5 may be in contact with the impact absorbing liner 7 (7A). The headband 9 is formed in a ring shape, and is installed on the lower helmet body component 15 within the lower helmet body component 15.

[0085] Next, the operation of the protective cap 1 when it is changed from the use state to the storage state will be described.

[0086] First, in the stored state shown in Fig. 6, the upper cap body constituent 17 is pushed upward (see the arrow in Fig. 6). Then, as shown in Fig. 9, the hinge portion constituent 11 is rotated by about 30° (30° counterclockwise from the state shown in Fig. 6). In the state shown in Fig. 9, the upper cap body constituent 17 is pushed further upward.

[0087] Then, as shown in Fig. 10, the hinge part constituent 11 is rotated by about 60° (60° counterclockwise from the state shown in Fig. 6). In the state shown in Fig. 10, the upper cap body constituent 17 is pushed further upward. Then, as shown in Fig. 11, the hinge part constituent 11 is rotated by about 90° (90° counterclockwise from the state shown in Fig. 6).

[0088] In the state shown in Fig. 11, the upper cap body constituent 17 is pushed further upward. Then, as shown in Fig. 5, the hinge portion constituent 11 is rotated by about 120° (120° counterclockwise from the state shown in Fig. 6), and the use state shown in Figs. 1, 4, and 5 is reached.

[0089] 9 and 10, the upper cap body component 17 is inclined obliquely, and the rear part of the upper cap body component 17 protrudes downward from the lower end of the lower cap body component 15. Also, in the state shown in Fig. 9 and 10, a part (side part) of the convex outer surface of the upper cap body component 17 contacts a recess 79 provided in a wall part 75 of the impact absorbing liner 7 (7B), and the upper cap body component 17 moves while being guided to some extent.

[0090] As shown in Figures 9 and 10, the rear part of the upper cap body constituent 17 protruding from the lower end of the lower cap body constituent 15 has the following advantages. When the cap is put into the bag in a stored state (when storing the cap), other stored items come into contact with the lower end of the lower cap body constituent 15. If the rear part of the upper cap body constituent 17 protrudes, it comes into contact with other stored items, and the cap body 3 can be prevented from being assembled by itself. In other words, the stored state can be maintained.

[0091] Although it is possible to avoid the protrusion of the rear part of the upper helmet body constituent 17 by further increasing the front-to-rear length of the helmet body, this would result in an unnecessary front-to-rear length of the helmet body 3 when wearing the protective helmet 1. When taking into consideration the storage of the upper helmet body constituent 17 while ensuring a minimum helmet body size, it is better to allow the rear part of the upper helmet body constituent 17 to protrude.

[0092] The operation of changing the protective cap 1 from the use state to the storage state is the reverse of the operation of changing from the storage state to the use state described above. When changing from the storage state to the use state, the locked portion 31 of the upper cap body constituent 17 is locked to the locking portion 29 of the lower cap body constituent 15 simply by moving it to the upper side of the upper cap body constituent 17. However, when changing from the use state to the storage state, the locking of the locked portion 31 by the locking portion 29 must be released.

[0093] That is, it is necessary to bend the arm main body 45 rearward from the state shown in FIG. 12(a), and then push the rear portion of the upper cap body component 17 downward to release the upper cap body component rib 57 from the engagement by the engagement claw 47, as shown in FIG. 12(c)(d).

[0094] The protective cap 1 is configured to include a lower cap body constituent 15, an upper cap body constituent 17, and a hinge portion constituent 11. The upper cap body constituent 17 is configured to move relative to the lower cap body constituent 15 with only the hinge portion constituent 11 between the use state and the storage state. This simplifies the configuration of the protective cap 1, and the manufacturing process can be simplified. Also, the operation when changing from the use state to the storage state and the operation when changing from the storage state to the use state can be simplified. Furthermore, the height dimension when folded can be reduced.

[0095] In addition, in the protective helmet described in Patent No. 5949666, the helmet body is divided into three or more parts, which makes it possible to reduce the storage height (height dimension when stored). However, this increases the number of parts, which may increase the assembly labor hours and price.

[0096] In addition, in the protective cap 1, a lower cap body constituent 15 and an upper cap body constituent 17 are constituted in such a manner that the bowl-shaped cap body 3 is divided into two parts on a plane that includes the center of the bowl-shaped cap body 3 and is perpendicular to the height direction of the bowl-shaped cap body 3. And, a hinge portion constituent 11 that is separate from the lower cap body constituent 15 and the upper cap body constituent 17 is rotatably engaged with the lower cap body constituent 15 and the upper cap body constituent 17.

[0097] This increases the degree of freedom of movement of the upper cap body constituent 17 relative to the lower cap body constituent 15 compared to the state in which the upper cap body constituent 17 is directly engaged with the lower cap body constituent 15, and further prevents the height dimension in the stored state from becoming large. Also, the cap can be stored in a business bag in the stored state.

[0098] In addition, in the protective cap described in Japanese Utility Model Application Laid-Open Publication No. 2-122033, it can be estimated that the stored height (height dimension value in the stored state) is about 71% of the assembled height (height dimension value in the used state). However, at this level, the height dimension value is still large, and it is not possible to sufficiently prevent the height dimension value from increasing. In addition, in the protective cap described in Japanese Patent No. 5949666, it can be estimated that the stored height is about 56% of the height when assembled (when used) by dividing the cap body into three or more parts. Even with this, it is not possible to sufficiently prevent the height dimension value from increasing.

[0099] In addition, in the protective cap 1, the headband 9 is provided on the bowl-shaped cap body 3, but the upper cap body constituent 17 and the hinge portion constituent 11 are configured to be stored in the lower cap body constituent 15 without being hindered by the headband 9. As a result, even when the protective cap 1 is configured to include the necessary headband 9, it can be put into a stored state.

[0100] Although the Japanese Utility Model Application Publication No. 2-122033 does not disclose details of the interior of the protective cap, such as the headband, it can be inferred based on the diagrams in the publication that when the upper part of the cap is stored, the headband may come into contact with the front part of the upper part of the cap.

[0101] Moreover, in the protective cap 1, the hinge portion constituent 11 engages with the lower cap body constituent 15 and the upper cap body constituent 17 at the appropriate locations described above. Moreover, the protective cap 1 is configured such that, when transitioning from a stored state to a usage state, the upper cap body constituent 17 moves at an angle relative to the lower cap body constituent 15. This allows the value of the height dimension in the stored state to be reasonably and reliably reduced.

[0102] In addition, in the protective cap 1, the engaged portion 31 is engaged with the engaging portion 29, so that the state in which the lower cap body constituent 15 and the upper cap body constituent 17 form the bowl-shaped cap body 3 is maintained. This allows the lower cap body constituent 15 and the upper cap body constituent 17 to be fixed to each other. Note that the protective cap described in Patent No. 5949666 requires many locks to fix multiple cap body constituents together, making assembly and storage operations cumbersome. Also, when checking whether the cap is locked, having many locks is cumbersome.

[0103] In addition, in the protective cap 1, in an embodiment in which the hinge portion constituent 11 is provided at the rear end portions of the lower cap body constituent 15 and the upper cap body constituent 17, the locking portion 29 and the locked portion 31 are provided at the front end portions of the lower cap body constituent 15 and the upper cap body constituent 17.

[0104] Second Embodiment The protective cap 1a according to the second embodiment of the present invention differs from the protective cap 1 according to the first embodiment of the present invention in the shape of the engaging portion 29 and the engaged portion 31, but is otherwise configured in the same manner as the protective cap 1, and is deformable in the same manner as the protective cap 1.

[0105] That is, in the protective cap 1a according to the second embodiment of the present invention, as shown in Fig. 27 to Fig. 29, the lower cap body component engagement portions 19 of the hinge part component 11 are provided in a pair symmetrically on the left and right. The first hinge part component engagement portion 21 of the lower cap body component 15, with which the hinge part component 11 engages, is also provided in a pair symmetrically on the left and right. The predetermined upper cap body component engagement portion 23 of the hinge part component 11 is also provided in a pair symmetrically on the left and right. The second hinge part component engagement portion 25 of the upper cap body component 17, with which the hinge part component 11 engages, is also provided in a pair symmetrically on the left and right.

[0106] The lower cap body constituent 15 is provided with a locking portion 29, and the upper cap body constituent 17 is provided with a locked portion 31. The locked portion 31 is locked to the locking portion 29, so that the state in which the lower cap body constituent 15 and the upper cap body constituent 17 form a bowl-shaped cap body 3 is maintained. The locking portions 29 are provided in a pair symmetrically. That is, one of the pair of locking portions 29 is provided at the left rear end portion of the lower cap body constituent 15, and the other of the pair of locking portions 29 is provided at the right rear end portion of the lower cap body constituent 15. The locked portions 31 are also provided in a pair symmetrically. That is, one of the pair of engaging portions 31 is provided at the left rear end portion of the upper cap body component 17, and the other of the pair of engaging portions 31 is provided at the right rear end portion of the upper cap body component 17.

[0107] In the protective cap 1a, the lower cap body component engaging portion 19, the upper cap body component engaging portion 23, the first hinge portion component engaging portion 21, and the second hinge portion component engaging portion 25 are provided in a symmetrical pair. Also, in the protective cap 1a, the locking portion 29 and the locked portion 31 are provided in a symmetrical pair. This makes it possible to secure an area in which the impact absorbing liner 7 can be installed, and the protective cap 1a can pass the impact test for the back of the head and also pass the impact test for the forehead.

[0108] In the protective cap described in Japanese Utility Model Application Laid-Open Publication No. 2-122033, if there is a lock near the center of the back of the head, the area where the impact absorbing liner can be installed is reduced, and there is a risk that the back of the head impact test cannot be passed. Also, in the protective cap described in Japanese Patent No. 5949666, if there is a lock near the center of the back of the head, the area where the impact absorbing liner can be installed is reduced, and there is a risk that the back of the head impact test cannot be passed, so a structure that absorbs impact with the interior, etc. is necessary.

[0109] Incidentally, standards for protective helmets are set out for two types: "protective helmets to prevent danger from flying or falling objects" and "protective helmets to prevent danger from falling." In particular, the following contents in " " are stated for "protective helmets to prevent danger from falling."

[0110] "After high-temperature treatment, etc., the helmets are fitted to a dummy head with its centerline inclined 30 degrees to the horizontal so that the impact points are at the front and back of the helmet, and a 5 kg flat striker (only those made of steel that meets the SS400 standard specified in the Japanese Industrial Standard G3101 (general structural rolled material) and with an impact surface of 127 mm in diameter) is allowed to freely drop from a height of 1 m."

[0111] A flat striker will collide with the front and back of the helmet. If there is a lock (engaging part 29, engaged part 31) or hinge (through hole 69 and protrusion 71 of hinge part constituent body 11) on the impact surface of the helmet, there is a risk that the parts will be destroyed, the helmet body will be released from its fixed position, or the helmet will not pass the impact test.

[0112] In the protective cap 1a, the through hole 69 and the protrusion 71 of the hinge portion constituent body 11 are moved to the left side or the right side and provided as a pair symmetrically, so that the above-mentioned standards for protective caps can be satisfied.

[0113] 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]

[0114] 1 Hard hat 3. Hat body 9. Headbands 11 Hinge component 15 Lower cap body structure 17 Upper cap body structure 19 Predetermined portion of hinge component (lower cap component engagement portion) 21: Predetermined portion of the lower cap body component (first hinge portion component engagement portion) 23 Other specified parts of the hinge part constituent body (upper cap body constituent body engagement part) 25 Predetermined portion of upper cap body component (second hinge portion component engagement portion) 29 Locking part 31 Locked part

Claims

1. A lower cap component constituting a lower portion of the bowl-shaped cap; An upper cap body component constituting an upper portion of the bowl-shaped cap body; a hinge portion constituent that is rotatably engaged at a predetermined portion of the lower cap body constituent and rotatably engaged at another predetermined portion of the upper cap body constituent; having A protective cap configured such that the upper cap body constituent and the hinge portion constituent move relative to the lower cap body constituent between a state in which the lower cap body constituent and the upper cap body constituent form the bowl-shaped cap, and a state in which the upper cap body constituent and the hinge portion constituent are stored within the lower cap body constituent.

2. The lower cap body constituent and the upper cap body constituent are configured in such a manner that the bowl-shaped cap body is divided into two parts by a plane including a central part of the bowl-shaped cap body and perpendicular to a height direction of the bowl-shaped cap body, The hinge portion construct is engaged with the lower cap body construct at a front end portion of the lower cap body construct, and is engaged with the upper cap body construct at a front end portion of the upper cap body construct, Alternatively, the hinge portion construct is engaged with the lower helmet body construct at a rear end portion of the lower helmet body construct, and is engaged with the upper helmet body construct at a rear end portion of the upper helmet body construct.

3. The bowl-shaped hat body is provided with a headband, 2. The protective cap according to claim 1, wherein the upper cap body constituent and the hinge portion constituent are configured to be stored within the lower cap body constituent without being obstructed by the headband.

4. the predetermined portion of the hinge part constituent is provided at a lower end portion of the hinge part constituent, a predetermined portion of the lower cap body constituent with which the hinge portion constituent engages is provided at a front end portion of the lower cap body constituent in the front-rear direction and is provided at an upper end portion of the lower cap body constituent in the up-down direction, the other predetermined portion of the hinge part constituent is provided at an upper end portion of the hinge part constituent, a predetermined portion of the upper cap body constituent with which the hinge portion constituent engages is provided at a front end portion of the upper cap body constituent in the front-rear direction and is provided at a lower end portion of the upper cap body constituent in the up-down direction, 3. The protective cap according to claim 2, wherein, when the state in which the upper cap body constituent and the hinge portion constituent are housed in the lower cap body constituent transitions to a state in which the bowl-shaped cap is formed by the lower cap body constituent and the upper cap body constituent, the upper cap body constituent is inclined relative to the lower cap body constituent so that the rear portion of the upper cap body constituent is on the lower side and the front portion is on the upper side, and a part of the upper cap body constituent protrudes downward from the lower end of the lower cap body constituent, and then the upper cap body constituent moves upward until another part of the upper cap body constituent protrudes upward from the upper end of the lower cap body constituent, and then the inclination of the upper cap body constituent is eliminated to form the bowl-shaped cap.

5. The predetermined portions of the hinge portion constituent are provided in a pair symmetrically on the left and right, The lower cap body constituent has a pair of predetermined portions with which the hinge portion constituent engages, the pair being provided symmetrically on the left and right, The other predetermined portions of the hinge portion constituent are also provided in a pair symmetrically, The upper cap body constituent has a pair of predetermined portions with which the hinge portion constituent engages, the pair being provided symmetrically on the left and right, The lower cap component is provided with a locking portion, The upper cap body component is provided with a latched portion, The engaged portion is engaged with the engaging portion, so that a state in which the lower cap body constituent and the upper cap body constituent form the bowl-shaped cap body is maintained, The locking portions are provided in a pair symmetrically, 5. The protective cap according to claim 4, wherein the pair of engaging portions are also provided symmetrically.

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