Headband size adjustment device and protective helmet

Abstract

To provide a headband size adjusting device capable of suppressing unintended size variation of a headband.SOLUTION: A headband size adjusting device includes: a locking plate having on its periphery a first arm portion 101 extending like a cantilever toward one side in the circumferential direction and forming a first locking hole 75 into which a first locking projection 83 is inserted; and a second arm portion 102 extending like a cantilever toward the other side in the circumferential direction and forming a second locking hole 76 into which a second locking projection 84 is inserted, the device further including: a first claw portion 111 on an outer peripheral portion of the first arm portion 101 to engage with a locking tooth 68 to restrict a rotation of a rotor to one side; and a second claw portion 112 on an outer peripheral portion of the second arm portion 102 to engage with the locking tooth 68 to restrict a rotation of the other side of the rotor.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a size adjustment device for a headband used in a protective cap (helmet), and to a protective cap equipped with a size adjustment device. [Background technology]

[0002] Conventionally, headbands of protective caps (helmets) are configured so that their size can be adjusted to fit the head of a wearer wearing the protective cap. For example, there is a protective cap that includes a rotating member in which a pinion that engages with a rack formed on the headband and a locking plate are integrally formed, a case that has this rotating member in a support cylinder, and a knob that rotates the rotating member supported within the support cylinder, and the size of the headband can be adjusted by rotating the rotating member with the knob (see Patent Document 1).

[0003] In addition, in the invention described in Patent Document 1, the claws formed on the outer periphery of the locking plate that constitutes the rotating member engage with locking teeth formed on the inner surface of the support cylinder portion, thereby functioning as a rotation stopper for the rotating member.

[0004] The surface of the claw that contacts the locking tooth when the rotating member is rotated to one side is perpendicular to the direction of rotation of the rotating member, and the surface that contacts the locking tooth when the rotating member is rotated to the other side is at an obtuse angle to the direction of rotation of the rotating member. Furthermore, the rotating member is designed so that the claw moves away from the locking tooth when the rotating member is rotated to the other side.

[0005] In other words, the rotating member is configured so that the claw portion functions as a rotation stopper only when the rotating member is rotated in one direction, and the claw portion does not actually function as a rotation stopper when the rotating member is rotated in the other direction (reverse direction). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5747854 Summary of the Invention [Problem to be solved by the invention]

[0007] As described above, by making the claw portion function as a rotation stopper only when the rotary member is rotated to one side, there is an effect that the operation when adjusting the size of the headband becomes easier.

[0008] However, for example, when the protective cap is pressed against the headband during storage or transportation, a load may be applied to the headband itself, causing the rotating member to rotate to the other side, which may result in an unintended change in headband size.Furthermore, a load may be applied to the knob (headband adjuster) that rotates the rotating member, causing the knob (headband adjuster) to rotate to the other side, which may result in an unintended change in headband size.

[0009] If the size of the headband changes unintentionally in this way, it becomes necessary to readjust the size of the headband when putting on the protective cap, which causes an increase in the work for the wearer.

[0010] The present invention has been made in consideration of the above circumstances, and aims to provide a headband size adjustment device and a protective cap that can suppress unintended size fluctuations of the headband. [Means for solving the problem]

[0012] The first aspect of the present invention that solves the above problem is:a headband guide body for holding the first and second holding parts to form the headband in a ring shape; a rotor that is rotatably housed in a cylindrical part provided in the headband guide body and integrally forms a locking plate with a pinion that meshes with the first rack and the second rack; and a headband adjuster that engages with the locking plate to rotate the rotor and adjust the size of the headband, the locking plate extending in a cantilevered manner toward one side in a circumferential direction and configured to rotate the rotor to adjust the size of the headband. a first arm portion on its periphery that forms a first locking hole into which a first locking protrusion of the adjustment body is inserted, and a second arm portion that extends cantilever-like toward the other circumferential side and forms a second locking hole into which a second locking protrusion of the headband adjustment body is inserted; the first arm portion has a first claw portion on its outer periphery that engages with a plurality of square-shaped locking teeth provided at predetermined intervals on the inner surface of the tubular portion to restrict rotation of the rotating body to one side; the second arm portion has a second claw portion on its outer periphery that engages with the locking teeth to restrict rotation of the rotating body to the other side; and the locking plate between the first arm portion and the second arm portion has a third claw portion on its outer periphery that abuts against the locking teeth to apply a load when rotating the rotating body.

[0013] The present invention 2 The embodiment is 1 The headband size adjustment device of the above aspect is characterized in that the locking plate has a third arm portion extending in a cantilevered manner in the circumferential direction at its peripheral edge, and the third claw portion is provided on the outer periphery of the third arm portion.

[0014] The present invention 3 The first aspect is or 2The headband size adjustment device of the above aspect is characterized in that, when the headband adjustment body is rotated to one side, the first arm portion is abutted by the first locking protrusion and is thereby flexibly deformed toward the center of the locking plate, and when the headband adjustment body is rotated to the other side, the second arm portion is abutted by the second locking protrusion and is thereby flexibly deformed toward the center of the locking plate.

[0015] The present invention 4 The first to third aspects are as follows: 3 The headband size adjusting device is any one of the above, wherein the locking plate has a first abutment portion against which the second locking protrusion abuts when the headband adjuster is rotated to one side and the first locking protrusion abuts against the first arm portion, and a second abutment portion against which the first locking protrusion abuts when the headband adjuster is rotated to the other side and the second locking protrusion abuts against the second arm portion.

[0016] The present invention 5 The first to third aspects are as follows: 4 The headband size adjustment device is any one of the above, characterized in that the first holding portion and the second holding portion are formed in an arc shape that is convex on the opposite side to the cap body when the headband is placed on the cap body of a protective cap, and the center of the arc is located closer to the cap body than the headband main body.

[0017] The present invention 6 The first to third aspects are as follows: 5 The present invention relates to a protective cap comprising a headband size adjustment device according to any one of the above aspects. [Effects of the Invention]

[0018] According to the headband size adjustment device of the present invention, when not in operation, the first and second claws are locked by the locking teeth, restricting rotation of the rotor in both directions, thereby preventing the headband size from changing unexpectedly during storage, transportation, etc.

[0019] Furthermore, the engagement of the first and second claws with the locking teeth is released as needed by rotating the headband adjuster, allowing for easy adjustment of the headband size without cumbersome operations. Furthermore, because one of the first and second claws is always engaged with the locking teeth, the rotating body can be positioned relatively easily in a desired position regardless of the rotation direction of the rotating body. Therefore, the headband can be adjusted to a desired size relatively easily regardless of the rotation direction of the rotating body. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a rear view of a protective cap according to an embodiment of the present invention worn by a wearer. [Figure 2] 1 is a side view of a protective cap according to an embodiment of the present invention worn by a wearer. [Figure 3] 1 is a development view showing a schematic configuration of a headband provided in a protective cap according to an embodiment of the present invention. [Figure 4] 1 is a perspective view of a headband size adjustment device according to an embodiment of the present invention. [Figure 5] 1 is an exploded perspective view of a headband size adjustment device according to an embodiment of the present invention. [Figure 6] 1 is a cross-sectional view of a headband size adjustment device according to an embodiment of the present invention. [Figure 7] 1 is a cross-sectional view of a headband size adjustment device according to an embodiment of the present invention. [Figure 8] FIG. 2 is a perspective view of a headband adjuster according to an embodiment of the present invention. [Figure 9] 1 is a perspective view of a rotating body according to an embodiment of the present invention. [Figure 10]FIG. 4 is an enlarged cross-sectional view of a first claw portion according to one embodiment of the present invention. [Figure 11] FIG. 4 is an enlarged cross-sectional view of a second claw portion according to one embodiment of the present invention. [Figure 12] FIG. 4 is an enlarged cross-sectional view of a third claw portion according to one embodiment of the present invention. [Figure 13] 10A to 10C are diagrams illustrating the operation of the headband size adjusting device according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0022] Fig. 1 and Fig. 2 are diagrams showing a state in which a wearer is wearing a protective cap according to one embodiment of the present invention, Fig. 1 is a diagram seen from behind, and Fig. 2 is a diagram seen from the side. Fig. 3 is a development view showing a schematic configuration of a headband provided in the protective cap according to one embodiment of the present invention.

[0023] As shown in Figures 1 to 3, a protective cap (safety cap: helmet) 1 in this embodiment is configured to include a bowl-shaped cap body 2, a headband 3 as a wearing body installed inside the cap body 2, and a chin strap 4. Although not shown, a hammock is installed inside the cap body 2, which together with the headband 3 forms a wearing body. When a wearer puts on this protective cap 1, the headband 3 comes into contact with the wearer's head, and the cap body 2 is supported by the wearer's head and covers the head. An impact absorbing liner for absorbing impact may be installed inside the cap body 2 of the protective cap 1.

[0024] The headband 3 is formed in a band shape and includes a band main body 31, and a first holding portion 32 and a second holding portion 33 provided at both longitudinal ends of the band main body 31. The band main body 31 is formed in the middle of the headband 3 in the longitudinal direction, the first holding portion 32 is formed at one longitudinal end of the band main body 31, and the second holding portion 33 is formed at the other longitudinal end of the band main body 31. In this embodiment, the first holding portion 32 and the second holding portion 33 are formed in an arc shape.

[0025] An oval first through-hole 34 is formed in the center of the first holding portion 32. A first rack 35 is formed in the first through-hole 34. The first rack 35 is formed by repeating triangular or trapezoidal concaves and convexes along substantially the entire length of one side in the width direction of the first through-hole 34 (the longer of the two opposing large arc-shaped sides: the lower side in FIG. 3).

[0026] An oval second through-hole 36 is formed in the center of the second holding portion 33. A second rack 37 is formed in the second through-hole 36. The second rack 37 is formed by repeating triangular or trapezoidal concaves and convexes along substantially the entire length of one side of the second through-hole 36 in the width direction (the shorter of the two opposing large arc-shaped sides: the upper side in FIG. 3).

[0027] The headband 3 is provided with a plurality of fastening portions 38 for fixing the headband 3 to the cap body 2. These fastening portions 38 are actually attached to a hammock (not shown) installed inside the cap body 2.

[0028] The headband 3 configured as described above is held in a ring shape by overlapping the first holding portion 32 and the second holding portion 33, and is placed inside the cap body 2 of the protective cap 1. In this state, the centers (centers of the arcs) of the first holding portion 32 and the second holding portion 33 are located closer to the cap body 2 (upper side) than the headband 3, and are convex on the opposite side (lower side) from the cap body 2 (see FIGS. 1 and 2). With this configuration, when the wearer puts on the protective cap 1, the protective cap 1 (headband 3) can be made to fit snugly. In other words, the wearer can be made to feel a good fit.

[0029] Furthermore, the protective cap 1 is equipped with a size adjustment device 5 that adjusts the size (diameter, circumference) of the headband 3. The size adjustment device 5 adjusts the size of the headband 3, which is held in an annular shape and placed inside the cap body 2, and is configured to include a headband guide body 6, a rotating body 7, and a headband adjustment body 8 in addition to the headband 3, as shown in Figs.

[0030] The headband guide body 6 guides the first holding portion 32 and the second holding portion 33 so that the first holding portion 32 and the second holding portion 33 overlap each other and form the headband 3 in a ring shape.

[0031] The rotating body 7 is configured to include a pinion 71 that meshes with the first rack 35 provided on the first holding portion 32 and the second rack 37 provided on the second holding portion 33, and a locking plate 72 that is formed integrally with the pinion 71. The rotating body 7 is rotatably housed in a tubular portion 63 provided on the headband guide body 6.

[0032] The headband adjuster 8 engages with the locking plate 72 of the rotating body 7 to rotate the rotating body 7. The headband adjuster 8 includes an operating portion 81 that serves as a knob, a shaft portion 82 that is provided in the center of the operating portion 81 and serves as the center of rotation when operating (rotating) the operating portion 81, and a first locking protrusion 83 and a second locking protrusion 84 that are provided around the shaft portion 82 and engage with the locking plate 72. The headband adjuster 8 is supported by the headband guide body 6 so as to be rotatable together with the rotating body 7.

[0033] In the size adjustment device 5 of this embodiment having such a configuration, the size of the annular headband 3 can be easily adjusted by operating the operating part 81 of the headband adjustment body 8 to rotate the rotating body 7, that is, by rotating the pinion 71 that meshes with the first rack 35 and the second rack 37.

[0034] Hereinafter, each component of the size adjusting device 5 according to this embodiment will be described in further detail with reference to FIGS.

[0035] Fig. 4 is an assembled perspective view of the size adjustment device, and Fig. 5 is an exploded perspective view of the size adjustment device. Fig. 6 is a cross-sectional view of the size adjustment device, taken along line AA in Fig. 4. Fig. 7 is a cross-sectional view of the size adjustment device, taken along line BB in Fig. 6. Fig. 8 is a perspective view of the headband adjuster, and Fig. 9 is a perspective view of the rotating body. Figs. 10 to 12 are enlarged cross-sectional views of a portion of Fig. 7, with Fig. 10 corresponding to the first claw portion, Fig. 11 corresponding to the second claw portion, and Fig. 12 corresponding to the third claw portion.

[0036] As shown in the drawings, the headband guide body 6, which is a member for guiding the headband 3, is composed of two members, a first guide member 60A and a second guide member 60B in this embodiment (see FIG. 5, etc.). The first guide member 60A is arranged inside the cap body 2 (toward the wearer's head: front) with respect to the headband 3 (first holding portion 32 and second holding portion 33), and the second guide member 60B is arranged outside the cap body 2 with respect to the headband 3 (on the opposite side from the first guide member 60A: rear).

[0037] The first guide member 60A and the second guide member 60B are fixed so as to sandwich the overlapping first holding portion 32 and second holding portion 33, thereby constituting the headband guide body 6. That is, the first holding portion 32 and the second holding portion 33 of the headband 3 are inserted from opposite directions into the space formed between the first guide member 60A and the second guide member 60B, and are held in an overlapping state in this space.

[0038] In this embodiment, the first holding portion 32 is located on the first guide member 60A side, and the second holding portion 33 is located on the second guide member 60B side within the headband guide body 6. Of course, the positions of the first holding portion 32 and the second holding portion 33 may be reversed.

[0039] Furthermore, on the inner surface of the first guide member 60A (the surface on the second guide member 60B side), a plurality of guide portions 61 that protrude toward the second guide member 60B and extend in the longitudinal direction of the headband 3 are provided at predetermined intervals in the width direction of the headband 3. One side of the headband 3 (first holding portion 32) is supported by these plurality of guide portions 61. Providing these plurality of guide portions 61 reduces the contact area with the headband 3, making it easier to slide the headband 3.

[0040] Furthermore, a contact area 62 with which a part of the second guide member 60B comes into contact is provided in the center of the first guide member 60A in the longitudinal direction of the headband 3. The multiple guide portions 61 are provided continuously except for this contact area 62.

[0041] A tubular portion 63, in which the rotating body 7 is rotatably housed, is provided integrally with the second guide member 60B in the longitudinal center of the headband 3. The tubular portion 63 is provided with an opening on the surface opposite to the first guide member 60A. An engagement hole 64 is formed in a bottom wall 63a of the tubular portion 63, with which the shaft portion 82 of the headband adjuster 8 engages. The second guide member 60B is connected to the first guide member 60A with the bottom wall 63a of the tubular portion 63 abutting against the abutment region 62 of the first guide member 60A (see FIG. 6).

[0042] Furthermore, two insertion holes 65 are formed in the peripheral wall of the tubular portion 63, into which the first holding portion 32 and the second holding portion 33 of the headband 3 are inserted when the first guide member 60A and the second guide member 60B are fixed (see FIG. 5). In other words, the bottom wall 63a of the tubular portion 63 is connected by connecting portions 66 provided on both ends of the headband 3 in the width direction (see FIG. 6), thereby forming two insertion holes 65. Note that although FIG. 5 shows only one insertion hole 65 on the side of the second holding portion 33, a similar insertion hole 65 is also formed on the side of the first holding portion 32.

[0043] The bottom wall 63a of the tubular portion 63, together with the inner surface of the first guide member 60A, supports one side of the first holding portion 32. For this reason, a plurality of guide portions 61 are formed on the surface of the bottom wall 63a, similar to the first guide member 60A.

[0044] Furthermore, rectangular recesses 67 are provided at predetermined intervals around the entire circumference on the inner circumferential surface of the cylindrical portion 63 behind the insertion hole 65 (on the opposite side to the first guide member 60A), that is, on the inner circumferential surface of the cylindrical portion 63 at a portion where the locking plate 72 of the rotating body 7 is housed, and as a result, a plurality of rectangular locking teeth 68 are provided at predetermined intervals around the entire circumference (see FIGS. 5 and 7). An end face (abutment surface) 68a of each locking tooth 68 is substantially perpendicular to the rotation direction of the rotating body 7.

[0045] The rotating body 7 and the headband adjuster 8 are rotatably supported within the cylindrical portion 63.

[0046] As shown in Figure 8, the headband adjuster 8 comprises an operating part 81 which serves as a knob, an axis part 82 which is provided at the center of the operating part 81 and serves as the center of rotation when operating the operating part 81, and a first locking protrusion 83 and a second locking protrusion 84 which are provided around the axis part 82 and engage with the locking plate 72 of the rotating body 7.

[0047] The shaft 82 is inserted into the central hole 73 of the rotating body 7 housed in the cylindrical portion 63, and its tip is engaged with an engagement hole 64 formed in the bottom wall 63a of the cylindrical portion 63. As a result, the headband adjuster 8 is supported by the headband guide body 6 so as to be rotatable together with the rotating body 7, while closing the opening of the cylindrical portion 63 with the operating portion 81 (see FIG. 6).

[0048] Incidentally, the shaft portion 82 is divided into two parts in the axial direction by a slit portion 85 extending in the radial direction. This allows each part of the shaft portion 82 to be elastically deformed toward the slit portion 85. Therefore, the shaft portion 82 can be inserted into and removed from the engagement hole 64 relatively easily.

[0049] An insertion protrusion 69 is provided in a region of the contact region 62 of the first guide member 60A that faces the slit portion 85. This insertion protrusion 69 is inserted into the slit portion 85 with the shaft portion 82 of the headband adjuster 8 engaged with the engagement hole 64.

[0050] For example, it is conceivable that a worker may drop the protective cap 1 on the ground while carrying it. When the protective cap 1 touches the ground, a load is applied to the protective cap 1, and the size adjustment device 5 may also be subjected to an impact. If this impact causes the headband adjuster 8 to come off, it may become impossible to continue working. However, by inserting the insertion protrusion 69 into the slit portion 85, elastic deformation of the shaft portion 82 is suppressed, and it is possible to prevent the headband adjuster 8 from falling off.

[0051] The rotating body 7, which is rotatably housed together with the headband adjuster 8 inside the tubular portion 63, includes a pinion 71 and a locking plate 72, and this locking plate 72 has a central hole 73 formed therein through which the shaft portion 82 of the headband adjuster 8 is inserted, as shown in Fig. 9 etc. Additionally, around the central hole 73, there are provided a first locking hole 75 into which the first locking protrusion 83 of the headband adjuster 8 is engaged, and a second locking hole 76 into which the second locking protrusion 84 is engaged.

[0052] More specifically, the locking plate 72 has a first arm 101 on its periphery that extends in a cantilevered manner toward one side in the circumferential direction (direction L in FIG. 7), and the first locking hole 75 is formed by this first arm 101. The locking plate 72 also has a second arm 102 on its periphery that extends in a cantilevered manner toward the other side in the circumferential direction (direction R in FIG. 7), and the second arm 102 forms the second locking hole 76.

[0053] A first claw portion 111 is provided on the outer periphery of the first arm portion 101, and comes into contact with the contact surface 68a of the locking tooth 68 provided on the inner periphery of the tube portion 63 to restrict rotation of the rotating body 7 to one side (direction L in FIG. 7). A second claw portion 112 is provided on the outer periphery of the second arm portion 102, and comes into contact with the contact surface 68a of the locking tooth 68 to restrict rotation of the rotating body 7 to the other side (direction R in FIG. 7). The first arm portion 101 including the first claw portion 111 and the second arm portion 102 including the second claw portion 112 are formed to be symmetrical with respect to the center line of the locking plate 72.

[0054] 10, the first claw portion 111 is configured to include a first surface 111a that comes into contact with the contact surface 68a of the locking tooth 68 when the rotor 7 is rotated in the L direction, and a second surface 111b that comes into contact with the contact surface 68a of the locking tooth 68 when the rotor 7 is rotated in the R direction. The first surface 111a is formed substantially perpendicular to the rotation direction of the rotor 7, and the second surface 111b is formed to be inclined with respect to the rotation direction. That is, the first surface 111a is formed so that the angle θ1 with respect to the outer peripheral surface of the locking plate 72 is substantially a right angle, and the second surface 111b is formed so that the angle θ2 with respect to the outer peripheral surface of the locking plate 72 is an obtuse angle.

[0055] 11 , like the first claw portion 111, the second claw portion 112 is configured to include a first surface 112a that abuts against the abutment surface 68a of the locking tooth 68 when the rotor 7 is rotated in the L direction, and a second surface 112b that abuts against the abutment surface 68a of the locking tooth 68 when the rotor 7 is rotated in the R direction. However, unlike the first claw portion 111, the first surface 112a is formed to be inclined with respect to the rotation direction of the rotor 7, and the second surface 112b is formed to be approximately perpendicular to the rotation direction. In other words, the first surface 112a is formed so that the angle θ3 with respect to the outer peripheral surface of the locking plate 72 is an obtuse angle, and the second surface 112b is formed so that the angle θ4 with respect to the outer peripheral surface of the locking plate 72 is approximately a right angle.

[0056] Furthermore, a third claw 113 is provided on the outer periphery of the locking plate 72 between the first arm 101 and the second arm 102. The third claw 113 contacts the locking teeth 68 and applies a load when rotating the rotor 7. In this embodiment, the third arm 103 extends in a cantilevered manner along the circumferential direction on the periphery of the locking plate 72. The third arm 103 is provided between the tip of the first arm 101 and the tip of the second arm 102, and extends in a cantilevered manner toward the other circumferential side (R direction) similarly to the second arm 102. The third claw 113 is provided on the outer periphery of the third arm 103. Note that the third arm 103 may extend toward one circumferential side (L direction) similarly to the first arm 101.

[0057] As shown in FIG. 12 , like the first claw portion 111 and the second claw portion 112, the third claw portion 113 also includes a first surface 113a that abuts against the abutment surface 68a of the locking tooth 68 when the rotor 7 is rotated in the L direction, and a second surface 113b that abuts against the abutment surface 68a of the locking tooth 68 when the rotor 7 is rotated in the R direction. However, unlike the first claw portion 111, the first surface 113a and the second surface 113b are each formed to be inclined with respect to the rotation direction of the rotor 7. That is, the first surface 113a is formed so that the angle θ5 relative to the outer peripheral surface of the locking plate 72 is an obtuse angle, and the second surface 113b is formed so that the angle θ6 relative to the outer peripheral surface of the locking plate 72 is an obtuse angle. These angles θ5 and θ6 may be the same angle, but in this embodiment, the angle θ5 is smaller than the angle θ6.

[0058] With the headband size adjustment device 5 configured as described above, when not in operation, the first claw portion 111 and the second claw portion 112 are each locked by the locking teeth 68, restricting rotation of the rotating body 7 in both directions. This prevents the size of the headband 3 from unexpectedly changing when the protective cap 1 is stored or moved.

[0059] Furthermore, the engagement of the first claw portion 111 and the second claw portion 112 with the locking teeth 68 can be appropriately released by rotating the headband adjustment body 8, so that the size of the headband 3 can be easily adjusted without complicating the operation.

[0060] Furthermore, because either the first claw portion 111 or the second claw portion 112 is always engaged with the locking tooth 68, the rotating body 7 can be relatively easily positioned at a desired position regardless of the rotation direction of the rotating body 7. Therefore, regardless of the rotation direction of the rotating body 7, the headband 3 can be relatively easily adjusted to a desired size.

[0061] Furthermore, since the third claw 113, together with the first claw 111 or the second claw 112, is always in contact (engages) with the locking tooth 68, an appropriate load is always applied to the rotating body 7 when the rotating body 7 is rotated. This allows the operator (wearer) operating the size adjustment device 5 to rotate the headband adjuster body 8 with an appropriate operating feel. In addition, the constant operation sound notifies the operator of the rotation of the rotating body 7. This prevents the rotating body 7 from being turned too far, making it even easier to adjust the size of the headband 3.

[0062] Next, the movements of the rotating body 7 and headband adjuster 8 in the size adjuster 5 according to this embodiment will be described. Fig. 13 is a diagram illustrating the operation of the size adjuster, and is a cross-sectional view corresponding to line BB in Fig. 6.

[0063] First, when the rotating body 7 and headband adjuster 8 are in the standard position (see FIG. 7), that is, when the headband adjuster 8 is not being rotated and is not being operated, the first locking protrusion 83 engaged in the first locking hole 75 does not abut the first arm portion 101, or, even if it abuts, does not apply pressure. Similarly, the second locking protrusion 84 engaged in the second locking hole 76 does not abut the second arm portion 102, or, even if it abuts, does not apply pressure. In this state, the first claw portion 111 provided on the first arm portion 101 and the second claw portion 112 provided on the second arm portion 102 are engaged with the locking teeth 68, respectively, and rotation of the rotating body 7 in both directions is restricted. That is, the first surface 111a of the first claw portion 111 abuts against the abutment surface 68a of the locking tooth 68, thereby restricting rotation of the rotating body 7 in the L direction, and the second surface 112b of the second claw portion 112 abuts against the abutment surface 68a of the locking tooth 68, thereby restricting rotation of the rotating body 7 in the R direction. Therefore, for example, even if a small impact is applied to the headband 3 or headband adjuster 8, the size of the headband 3 will not change.

[0064] 13(a), when the operating part 81 of the headband adjuster 8 is rotated to one side (L direction) (when rotated left), the first locking protrusion 83 engaged in the first locking hole 75 moves in the L direction and abuts against the first arm part 101. More specifically, the first arm part 101 has a folded part 101a at its tip end that extends toward the opposite side (R direction), and the first locking protrusion 83 abuts against the folded part 101a of the first arm part 101.

[0065] When the operating part 81 of the headband adjuster 8 is further rotated in the L direction, the folded part 101a of the first arm part 101 is pressed by the first locking protrusion 83, and as a result, the first arm part 101 is flexibly deformed toward the center of the locking plate 72. When the first locking protrusion 83 moves to the vicinity of the end of the first locking hole 75, the first claw part 111 provided on the outer periphery of the first arm part 101 is disengaged from the locking tooth 68, and the rotating body 7 becomes rotatable in the L direction.

[0066] When the headband adjuster 8 is rotated in the L direction, the first surface 112a (see FIG. 11) of the second claw portion 112, which is inclined relative to the outer peripheral surface of the locking plate 72, comes into contact with the locking teeth 68. Therefore, the second claw portion 112 passes through each of the locking teeth 68 without being locked by the locking teeth 68. At this time, the second claw portion 112 is pressed by the locking teeth 68, causing the second arm portion 102 to bend and deform inward of the locking plate 72. Therefore, even when the headband adjuster 8 is rotated with a relatively weak force, the second claw portion 112 reliably passes through each of the locking teeth 68. The change in load when the second claw portion 112 passes through each of the locking teeth 68 is the feeling of operation felt by the operator.

[0067] Thereafter, when the operating portion 81 of the headband adjuster 8 is further rotated in the L direction, the first arm portion 101 is pushed in the L direction by the first locking protrusion 83, and the rotating body 7 including the pinion 71 rotates in the L direction together with the headband adjuster 8. As a result, the first holding portion 32 and the second holding portion 33 of the headband 3 move relative to each other via the first rack 35 and the second rack 37, and the size of the headband 3 is adjusted in the direction of increasing (opening).

[0068] In this embodiment, when the first locking projection 83 moves to the vicinity of the end of the first locking hole 75, the second locking projection 84 comes into contact with the first abutment portion 77. Therefore, the first arm portion 101 of the rotating body 7 is pressed in the L direction by the first locking projection 83 of the headband adjuster 8, and the first abutment portion 77 is pressed in the L direction by the second locking projection 84. By pressing the rotating body 7 at multiple points by the headband adjuster 8 in this way, the rotating body 7 can be rotated more smoothly.

[0069] On the other hand, when the operating part 81 of the headband adjuster 8 is rotated to the other side (R direction) (when rotating to the right) from a state in which the rotating part 7 and the headband adjuster 8 are in the standard position (see FIG. 7), as shown in FIG. 13(b), the second locking protrusion 84 engaged in the second locking hole 76 moves in the R direction and abuts against the second arm part 102. More specifically, the second arm part 102 has a folded part 102a at its tip end that extends toward the opposite side (R direction), and the second locking protrusion 84 abuts against the folded part 102a of the second arm part 102.

[0070] When the operating part 81 of the headband adjuster 8 is further rotated in the R direction, the folded part 102a of the second arm part 102 is pressed by the second locking protrusion 84, and accordingly, the second arm part 102 is flexibly deformed toward the center of the locking plate 72. When the second locking protrusion 84 moves to the vicinity of the end of the first locking hole 75, the second claw part 112 provided on the outer periphery of the second arm part 102 is disengaged from the locking tooth 68, and the rotating body 7 becomes rotatable in the R direction. At this time, the first locking protrusion 83 comes into contact with the second abutment part 78.

[0071] When the headband adjuster 8 is rotated in the R direction, the second surfaces 111b (see FIG. 10) of the first claw portions 111 that are inclined relative to the outer peripheral surface of the locking plate 72 come into contact with the locking teeth 68. Therefore, the first claw portions 111 pass through the locking teeth 68 without being locked by the locking teeth 68. At this time, the first claw portions 111 are pressed by the locking teeth 68, causing the first arm portions 101 to bend and deform toward the inside of the locking plate 72. Therefore, even when the headband adjuster 8 is rotated with a relatively weak force, the first claw portions 111 reliably pass through the locking teeth 68.

[0072] Thereafter, when the operating portion 81 of the headband adjuster 8 is further rotated in the R direction, the first arm portion 101 is pushed in the R direction by the second locking protrusion 84, and the second contact portion 78 is pushed in the R direction by the first locking protrusion 83, causing the rotating body 7 including the pinion 71 to rotate in the R direction together with the headband adjuster 8. As a result, the first holding portion 32 and the second holding portion 33 of the headband 3 move relative to each other via the first rack 35 and the second rack 37, and the size of the headband 3 is adjusted in the direction of decreasing (closing) it.

[0073] Furthermore, when the headband adjuster 8 is operated to rotate the rotating body 7 in this manner, the third claw portion 113 passes through each of the locking teeth 68 without being locked by the locking teeth 68. As described above, the first surface 113a and the second surface 113b of the third claw portion 113 are inclined surfaces that are inclined relative to the outer peripheral surface of the locking plate 72. Therefore, the third claw portion 113 passes through each of the locking teeth 68 without being locked by the locking teeth 68. At this time, the third claw portion 113 is pressed by the locking teeth 68, causing the third arm portion 103 to bend and deform inward of the locking plate 72.

[0074] For this reason, even when the headband adjuster 8 is rotated with a relatively weak force, the third claw portion 113 reliably passes through each locking tooth 68. When the third claw portion 113 passes through the locking teeth 68, a load is applied. Therefore, when the third claw portion 113 passes through the locking teeth 68, the force (rotational force) required to rotate the headband adjuster 8 becomes slightly stronger. In other words, when the third claw portion 113 passes through the locking teeth 68, the operator feels a stronger sense of operation.

[0075] Furthermore, in this embodiment, the angle θ5 of the first surface 113a of the third claw portion 113 relative to the outer circumferential surface of the locking plate 72 is smaller than the angle θ6 of the second surface 113b of the third claw portion 113 relative to the outer circumferential surface of the locking plate 72. For this reason, the load applied when the third claw portion 113 passes through the locking teeth 68 when rotating the rotating body 7 in the L direction is greater than the load applied when rotating the rotating body 7 in the R direction. In other words, the operating feel when rotating the headband adjuster 8 is greater when rotating the rotating body 7 in the L direction than when rotating the rotating body 7 in the R direction.

[0076] The operability of this headband adjuster 8 can be adjusted appropriately by changing the dimensions of each part of third claw 113 and third arm 103. For example, by changing the angles θ5 and θ6 of third claw 113, the amount of protrusion of third claw 113, or the thickness or length of third arm 103, the operability (rotational force) of headband adjuster 8 can be adjusted appropriately.

[0077] The operational feel (rotational force) of the headband adjuster 8 can also be adjusted by changing the dimensions of the first claw 111 and the first arm 101, and the dimensions of the second claw 112 and the second arm 102. However, these dimensions must be set with priority given to the function of stopping the rotation of the rotating body 7, and it may be difficult to adjust the operational feel of the headband adjuster 8 to an appropriate strength.

[0078] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

[0079] For example, in the above embodiment, the locking plate 72 is provided with the cantilevered third arm 103, and the third claw 113 is provided on the outer periphery of the third arm 103. However, the locking plate 72 does not necessarily have to be provided with the third arm 103. The portion of the locking plate 72 corresponding to the third claw 113 only needs to be formed so as to elastically deform to an extent that the third claw 113 can pass through the locking teeth 68 when the headband adjuster 8 is rotated. [Explanation of symbols]

[0080] 1 protective cap (helmet), 2 cap body, 3 headband, 4 chin strap, 5 size adjustment device, 6 headband guide body, 7 rotating body, 8 headband adjustment body, 31 band main body portion, 32 first holding portion, 33 second holding portion, 34 first through hole, 35 first rack, 36 second through hole, 37 second rack, 38 locking portion, 60A first guide member, 60B second guide member, 61 guide portion, 62 abutment area, 63 tubular portion, 63a bottom wall, 64 engagement hole, 65 insertion hole, 66 connecting portion, 67 recess, 68 locking tooth, 68a abutment surface, 69 insertion protrusion, 71 pinion, 72 locking plate, 73 center hole, 75 First locking hole, 76 Second locking hole, 77 First contact portion, 78 Second contact portion, 81 Operating portion, 82 Shaft portion, 83 First locking protrusion, 84 Second locking protrusion, 85 Slit portion, 101 First arm portion, 102 Second arm portion, 103 Third arm portion, 111 First claw portion, 112 Second claw portion, 113 Third claw portion

Claims

1. a headband having a band-shaped band body, a first holding portion provided at one end of the band body and having a first rack formed therein, and a second holding portion provided at the other end of the band body and having a second rack formed therein; a headband guide body for holding the first holding portion and the second holding portion to form the headband into a ring shape; a rotor that is rotatably accommodated in a cylindrical portion provided in the headband guide body, and that has a pinion that meshes with the first rack and the second rack and a locking plate integrally formed therewith; a headband adjuster that adjusts the size of the headband by engaging with the locking plate and rotating the rotating body; A headband size adjustment device comprising: The locking plate is a first arm portion extending in a cantilevered manner toward one side in the circumferential direction and forming a first locking hole into which a first locking protrusion of the headband adjuster is inserted; a second arm portion extending in a cantilevered manner toward the other side in the circumferential direction and forming a second locking hole into which the second locking protrusion of the headband adjuster is inserted, at the periphery thereof; Furthermore, a first claw portion is provided on the outer periphery of the first arm portion, the first claw portion engaging with a plurality of square-shaped locking teeth provided at predetermined intervals on the inner periphery of the cylindrical portion to restrict rotation of the rotating body to the one side, and a second claw portion is provided on the outer periphery of the second arm portion, the second claw portion engaging with the locking teeth to restrict rotation of the rotating body to the other side, A third claw portion is provided on the outer periphery of the locking plate between the first arm portion and the second arm portion, and the third claw portion abuts against the locking tooth to apply a load when rotating the rotating body. A headband size adjustment device.

2. The headband size adjusting device according to claim 1, the locking plate has a third arm portion extending in a cantilever shape along the circumferential direction at its peripheral edge, The third claw portion is provided on the outer periphery of the third arm portion. A headband size adjustment device.

3. 3. The headband size adjusting device according to claim 1, When the headband adjuster is rotated to the one side, the first arm portion is bent and deformed toward the center of the locking plate by the first locking protrusion coming into contact with the first arm portion, When the headband adjuster is rotated to the other side, the second arm portion is brought into contact with the second locking protrusion and is thereby flexibly deformed toward the center of the locking plate. A headband size adjustment device.

4. The headband size adjusting device according to any one of claims 1 to 3, The locking plate is a first abutment portion with which the second locking protrusion abuts when the headband adjuster is rotated to the one side so that the first locking protrusion abuts against the first arm portion; and a second abutment portion with which the first locking protrusion abuts when the headband adjuster is rotated to the other side and the second locking protrusion abuts against the second arm portion. A headband size adjustment device.

5. The headband size adjusting device according to any one of claims 1 to 4, When the headband is attached to the cap body of the protective cap, the first holding portion and the second holding portion are formed in an arc shape that is convex on the opposite side to the cap body, and the center of the arc is located closer to the cap body than the headband main body. A headband size adjustment device.

6. A protective cap comprising the headband size adjusting device according to any one of claims 1 to 5.

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