JP5808872B1 - 3-point hammock helmet - Google Patents

Abstract

A technique for reducing the weight of a helmet without sacrificing the shock absorbing ability of the helmet is provided. A helmet 10 includes a cap body 20 having three connecting portions (not shown) spatially separated from each other in a plan view of the helmet 10, and a hammock 30 disposed inside the cap body 20. The suspension band ends 72 are respectively connected to the three coupling portions of the cap body, the inside of the cap body 20, and the helmet 10 It is the inner 32 arrange | positioned in the position below the hammock 30 in the side view, Comprising: It has what contacts a wearer's head in the wearing condition of the helmet 10. FIG. [Selection] Figure 5

Description

  The present invention relates to a helmet that is worn on the head of the wearer to protect the head of the wearer, and more particularly, to a technique for reducing the weight of the helmet without sacrificing the shock absorption capability of the helmet. It is.

  A helmet (protective cap) that is worn on a head for protecting a wearer's head is already in widespread use, such as a work helmet and a disaster prevention helmet.

  As a basic performance of this type of helmet, there is a performance of protecting a wearer's head from an impact caused by the collision when a falling object or a flying object collides with the wearer's head. In order to realize this performance, the ability to absorb the impact applied to the helmet is required.

  For example, as shown in Patent Document 1, this type of helmet is generally configured to have a cap body (shell) that is a shell portion of the helmet and an interior body. The interior body has a headband that has the function of adjusting the helmet to fit the wearer's head circumference, a hammock that has the function of absorbing the impact applied to the helmet, and the helmet falling off the wearer's head. A string set having a function of preventing

  In this type of helmet, the cap body and the hammock absorb the shock, but it is said that it is not the cap body but the hammock that absorbs the shock immediately after the start of the shock. Therefore, in this type of helmet, the presence of a hammock is important for the purpose of shock absorption.

  As shown in Patent Documents 1 and 2, a hammock of this type of helmet has a plurality of suspension bands (leg portions) that are arranged inside the cap body and extend radially in a plan view of the helmet. The suspension bands are respectively connected to the plurality of connection portions of the cap body at the ends of the plurality of suspension bands.

JP 2003-49316 A Japanese Utility Model Publication No. 6-34331

  The inventors have studied a technique for reducing the weight of a helmet without sacrificing the basic performance of the helmet. As a result, it was found that the helmet could be reduced in weight if the structure of the hammock was improved.

  Specifically, conventionally, as shown in Patent Document 1, the hammock has four suspension bands and their four suspension band ends, and is connected to the cap body at four locations, or As shown in Patent Document 2, it has six suspension bands and six suspension band ends, and is connected to the cap body at six locations.

  On the other hand, the present inventors have noticed that if the number of the suspension bands and the number of the suspension band ends are reduced, the helmet becomes lighter. It was also noticed that when the number of is three, it has the ability to absorb shock more effectively than it is.

  In view of these findings, the present invention has been made to provide a technique for reducing the weight of a helmet without sacrificing the shock absorbing ability of the helmet.

In order to solve the problem, according to one aspect of the present invention, in order to protect the wearer's head, a helmet to be worn on the head,
A cap body having three connecting portions spatially separated from each other in a plan view of the helmet;
A hammock disposed inside the cap body, which has three suspension band end portions, which are connected to the three connection portions of the cap body, respectively. A three-point hammock wearing helmet is provided.

  An example of this three-point hammock-mounted helmet is an inner that is further disposed on the inner side of the cap body and below the hammock in a side view of the helmet, and is worn when the helmet is worn. Including those in contact with the person's head.

  An example of the three-point hammock wearing helmet is further provided between at least one of the three suspension band ends of the hammock and a corresponding one of the three connecting portions of the cap body. When a shock acts on the cap body, a force transmission system is formed in which the cap body, the buffer body, and the hammock are connected in series with each other. The impact is absorbed not only by the hammock but also by the buffer.

  In this example, for example, the hammock absorbs an impact by its own expansion (elongation), whereas the buffer absorbs an impact by its own compression (shrinkage).

  Further, in this example, for example, the shock absorber absorbs an impact by its contraction, and the force transmission system compresses the shock absorber in the first direction when the impact acts on the helmet ( The hammock, the buffer body and the cap body are connected to each other so that the cap body compresses (compresses) the buffer body in a second direction intersecting the first direction. Is done.

  The following aspects are obtained by the present invention. Each aspect is divided into sections, each section is given a number, and is described in a form that cites other section numbers as necessary. This is to facilitate understanding of some of the technical features that the present invention can employ and combinations thereof, and the technical features that can be employed by the present invention and combinations thereof are limited to the following embodiments. Should not be interpreted. That is, it should be construed that it is not impeded to appropriately extract and employ the technical features described in the present specification as technical features of the present invention although they are not described in the following embodiments.

  Further, describing each section in the form of quoting the numbers of the other sections does not necessarily prevent the technical features described in each section from being separated from the technical features described in the other sections. It should not be construed as meaning, but it should be construed that the technical features described in each section can be appropriately made independent depending on the nature.

(1) A helmet to be worn on the head to protect the wearer's head,
A cap having a generally hemispherical shell shape having three connecting portions spatially separated from each other in a plan view of the helmet;
When an impact acts on the cap body, it is a hammock that absorbs the impact, and is disposed inside the cap body, and has three suspension band end portions that extend radially in a plan view of the helmet, Those suspension band ends connected to the three connecting portions of the cap body,
The inner part of the cap body, the inner part disposed below the hammock in a side view of the helmet, and in contact with the upper part of the wearer's head when the helmet is worn, Restricting the hammock from contacting the wearer's head in the wearing state of the helmet,
A headband disposed inside the cap body and at a position below the inner in a side view of the helmet, and in a state of surrounding the wearer's head from the horizontal direction when the helmet is worn A three-point hammock-equipped helmet, including one to hold.

(2) At least one of the three connecting portions is
A holder for holding a corresponding one of the three suspension band end portions in a longitudinal direction of the suspension band end portion so as to be relatively displaceable within a predetermined range;
The shock absorber disposed between the holder and a corresponding suspension band end, and the shock is at least partially absorbed by being deformed in association with the relative displacement. Point hammock wearing helmet.

(3) The three-point hammock wearing type helmet according to (2), wherein the buffer body has higher impact absorption efficiency than the cap body and the hammock.

(4) The three connecting portions are arranged so as to be substantially symmetric with respect to a reference line in the front-rear direction passing through the center point of the helmet in a plan view of the helmet. A three-point hammock wearing helmet according to any of the above.

(5) In the state of wearing the helmet, the inner does not contact the hammock when no impact is applied to the helmet, but is allowed to contact the hammock when an impact is applied to the helmet. (3) A three-point hammock wearing helmet according to any one of (1) to (4).

(6) The three-point hammock wearing helmet according to any one of (1) to (5), wherein the hammock and the inner are both attached to the headband.

  According to the present invention, the hammock is configured to have three suspension band ends, and the hammock is mutually connected in the top view of the helmet among the cap bodies at the three suspension band ends. They are connected to three spatially separated positions.

  By the way, in a three-dimensional space, there is always one plane that passes through any three points simultaneously, but one plane that passes through any four or more points does not necessarily exist.

  When this is applied to a part called a helmet body and a part called a hammock, as schematically shown in FIG. 6 (a), the hammock has three suspension bands, and each of the suspension bands has one end ( When the other ends (free ends) of the suspension bands are respectively connected to three spatially different positions in the cap body, that is, the end of the suspension band of the hammock When the number of parts is three, there always exists one plane that passes through the three suspension band ends at the same time.

  This means that even if the lengths of the suspension bands do not exactly match each other, and even if the connection positions of the suspension bands and the cap body are not strictly strictly designed as designed, As long as the body is allowed to take any posture (orientation) in the space, the three suspension bands will always stretch without sagging, and the impact acting on the cap body (downward force in the figure) will be ensured. And the impact is at least partially absorbed by the extension of each suspension band. When an impact acting on the cap body is transmitted to each suspension band, an upward force F apparently acts on each suspension band.

  On the other hand, as schematically shown in FIG. 6 (b), when the number of suspending band ends of the hammock is four or more, one of the four or more suspending band ends is simultaneously passed. A plane does not necessarily exist, and usually, in most cases, of these four or more suspension band ends, only three suspension band ends define a single plane that passes simultaneously. The three corresponding suspension bands act and extend without sagging, but slack occurs in the remaining one of the hanging bands, which means that they are playing without contributing to shock absorption.

  This means that when the number of the suspension band ends of the hammock is 3, the impact applied to the helmet is distributed to any of these three suspension band ends. It means that any of these three suspension band ends exhibits an impact absorbing action.

  This is because, when the number of suspension band ends of the hammock is three, all suspension band ends contribute more effectively to shock absorption than when the number of suspension band ends is four or more. This means that there is no need for a hanging band to play without contributing to shock absorption.

  Therefore, according to the present invention, unlike the case where the number of suspension band end portions is four or more, there is no suspension band end portion that plays without contributing to shock absorption. As a result, according to the present invention, by realizing that there is no suspension band that plays around at the time of impact action, while realizing the impact absorption capability equivalent to a hammock having four or more suspension band ends, It is possible to reduce the weight of the hammock.

  To this end, when examining the shock absorption characteristics of the helmet in terms of reducing the damage caused by external shocks to the wearer's head, falling objects and flying objects during the entire period of impact. It is said that it is important that the helmet absorbs the shock rapidly in the initial phase of about 2 msec after the collision with the helmet.

  On the other hand, when the number of suspension bands is four or more, only three suspension bands absorb the shock in the initial phase, and the remaining one suspension band does not contribute to the shock absorption. Take a state where you play.

  On the other hand, when the number of suspension bands is three, in the initial phase, all the suspension bands are in a state of absorbing shock throughout the entire section. Even after the end of the initial phase, the three suspension bands continue to absorb the shock as planned until the end of the entire impact period.

  In this way, when the number of the end portions of the hammock is three, the entire period from the start to the end of the impact action is different from the case where the number of the end portions of the suspension band is four or more. Through the three suspension bands, that is, the entire hammock continuously absorbs the shock. This also shows that when the number of suspension band end portions of the hammock is three, the shock absorption is more effectively performed than when the number of suspension band end portions is four or more.

  By the way, when the number of the suspension band end portions of the hammock is 3, the distance between the suspension band end portions adjacent to each other in the plan view of the hammock is larger than when the number of the suspension band end portions is 4 or more. Tends to be long, and as a result, there is a tendency that the gap between the adjacent hanging bands becomes wide.

  On the other hand, conventionally, when the helmet is worn, the hammock comes into direct contact with the wearer's head. Therefore, in a plan view of the hammock, when the gap between the adjacent hanging bands becomes wide, the wearer feels that his / her head partially protrudes from the gap and the head gets out of the hammock. there is a possibility.

  For this reason, when the number of suspension band ends of the hammock is three, the wearing comfort (fitness) of the helmet is worse than when the number of suspension band ends is four or more, and the hammock is worn by the wearer. The feeling of holding the head firmly is weakened.

  In other words, if the number of hammock suspension band ends is three, the helmet's dynamic characteristics of shock absorption are improved, but the helmet's fit and hold characteristics may be sacrificed. There is.

  As a result, when the number of the end portions of the hammock is 3, the wearer is more likely to wear the cap body with respect to the head than when the number of end portions of the end strap is 4 or more. The sense of instability becomes stronger.

  That is, when the number of suspension band ends of the hammock is three, the wearer tends to feel that the wearing comfort and holdability of the helmet are lower than when the number of suspension band ends is four or more. It becomes stronger.

  On the other hand, according to the helmet, which is arranged at a position below the hammock in a side view and includes an inner that contacts the wearer's head in the wearing state of the helmet, in the wearing state of the helmet, The hammock does not contact the wearer's head, but an inner part located below the hammock and substantially exclusively contacting the wearer's head contacts the wearer's head.

  The shape and size of the inner does not depend on the shape and size of the hammock. Therefore, the shape and size of the inner can be designed from the viewpoint of improving the comfort and holdability of the helmet regardless of the hammock.

FIG. 1 is an exploded perspective view illustrating a helmet according to an exemplary embodiment of the present invention. 2A is a plan view showing the hammock shown in FIG. 1 in a flat developed state, and FIG. 2B is a perspective view showing a state in which the hammock shown in FIG. 2A is connected to the cap body. FIG. 2C is a perspective view showing a state in which the headband shown in FIG. 1 is attached to the hammock shown in FIG. 3 (a) is a perspective view showing a state in which the hammock shown in FIG. 2 (a) is connected to the cap body, and the direction of viewing is different from FIG. 2 (b). ) Is a longitudinal sectional view showing the hammock and the cap body shown in FIG. FIG. 4A is a longitudinal sectional view schematically showing the hammock and the cap body shown in FIG. 3A in a connected state and in an unloaded state, and FIG. It is a longitudinal cross-sectional view which shows typically a hammock and a cap body shown to (a) in a connection state and an impact state. 5A is a perspective view showing the assembled hammock, inner, and headband shown in FIG. 1, and FIG. 5B is an enlarged view of the tip of the inner shown in FIG. 5A. It is sectional drawing. FIG. 6A is a perspective view for explaining the operational effect when the number of end portions of the hammock suspension band is three, and FIG. 6B shows the number of end portions of the hammock suspension band. It is a perspective view for demonstrating typically the effect in the case where the number of suspension band ends is four as an example in the case of four or more.

  Hereinafter, one of more specific and exemplary embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view showing a helmet 10 according to an exemplary embodiment of the present invention. As shown in FIG. 1, the helmet 10 includes a cap body (for example, made of hard synthetic resin such as ABS) 20 having a hemispherical shell shape, and an impact absorbing liner (for example, styrofoam foam) disposed inside the cap body 20. And an interior body 24 disposed below the shock absorbing liner 22 in a side view of the helmet 10.

  The interior body 24 is composed of a plurality of parts, and specifically, the interior body 24 is a hammock (for example, a soft synthetic material such as PP) disposed below the shock absorbing liner 22 in a side view of the helmet 10. Resin) 30, an inner (for example, made of a soft synthetic resin such as plastic mesh material) 32 disposed below the hammock 30 in a side view of the helmet 10, and a lower portion than the inner 32 in a side view of the helmet 10. Headband (for example, made of soft synthetic resin such as PP) 34. FIG. 5A shows the hammock 30, the inner 32, and the headband 34 in an assembled state.

  The hammock 30 has a function of absorbing an impact applied to the helmet 10. Therefore, the hammock 30 floats from the outer peripheral edge 36 of the cap body 20 toward the center portion of the cap body 20 (portion facing the wearer's head top portion) and without contacting the center portion. Suspended to be in a posture. Thanks to such a layout, when the cap body 20 receives an external impact from above while the helmet 10 is worn, the impact is not input directly to the wearer's head, but via the hammock 30 as a medium. In addition, the shock is indirectly input to the wearer's head in a state where the impact is partially absorbed or alleviated by the hammock 30. As a result, the impact finally input to the wearer's head is alleviated or reduced.

  The inner 32 is more flexible than the hammock 30 and has a larger surface area than the hammock 30. Specifically, the area of the inner 32 that contacts the wearer's head is larger than the area of the contact area of the hammock 30 when the hammock 30 is assumed to be in direct contact with the wearer's head.

  Further, the shape of the region of the inner 32 that contacts the wearer's head is generally hemispherical, whereas the hammock 30 is assumed to be in direct contact with the wearer's head. The contact area has a shape that is more suitable for wrapping the wearer's head more entirely than the contact area of the hammock 30, such as generally triangulated.

  Therefore, in terms of wearing comfort and head holdability, the inner 32 is higher than the hammock 30 when it is assumed that the hammock 30 directly contacts the wearer's head.

  Similar to the hammock 30, the inner 32 extends from the outer peripheral edge 36 of the cap body 20 toward the center portion 70 of the hammock 30 (the portion facing the top of the wearer's head, see FIG. 2), and The hanger is suspended so as to float without contacting the central portion 70. Therefore, when the helmet 10 is worn, the top of the head of the wearer contacts the inner surface of the inner 32 but does not contact the inner surface of the hammock 30.

  As shown in FIGS. 1 and 5, the inner 32 has a central portion 40 and a plurality of leg portions 42 extending radially outward from the central portion 40.

  The distal end portions 44 of the leg portions 42 are attached to the headband 34 so as to be detachable and position adjustable. Specifically, as shown in FIG. 5B, a pile-and-hook structure is provided between the tip 44 of each leg 42 and the portion of the headband 34 to which the tip 44 is detachably mounted. Or a hook-and-loop fastener structure, that is, one having a male side surface (hook surface) and a female side surface (pile surface or loop surface) that are detachably coupled to each other is installed.

  Specifically, in the present embodiment, the entire inner 32 or at least the surface (one surface or both surfaces) of the distal end portion 44 acts as a female side surface (pile surface or loop surface). A side surface (hook surface) 46 is formed.

  The male side surface 46 is detachably mounted at an arbitrary position on the female side surface of the distal end portion 44 of the inner 32. In the mounted state, the inner 32 is prevented from being detached from the headband 34. As a result, the inner 32 is suspended from the outer peripheral edge 36 of the cap body 20 via the headband 34 and the hammock 30.

  Similar to the hammock 30, the inner 32 extends from substantially the same position as the outer peripheral edge 36 of the cap body 20 to the central portion 70 of the hammock 30 (the portion facing the top of the wearer's head, see FIG. 2). It is hung so that it may be in a posture of rising without contacting the central portion 70. Therefore, when the helmet 10 is worn, the top of the head of the wearer contacts the inner surface of the inner 32 but does not contact the inner surface of the hammock 30.

  The relative position between the female side surface and the male side surface 46 of the headband 34 at the front end portion 44 of each leg portion 42 of the inner 32 can be adjusted by the wearer. By the adjustment, the effective length of each leg portion 42 of the inner 32 (the length from the headband 34 to the center point of the central portion 40 of the inner 32) is adjusted. Therefore, according to the helmet 10, the depth of the helmet 10 can be freely adjusted by adjusting the effective length of each leg portion 42 of the inner 32.

  The inner 32 also has an impact absorption capability, but usually does not have an impact absorption capability as high as that of the hammock 30 or a buffer body 130 described later. Nevertheless, it is possible to design the helmet 10 so that the inner 32 also has an impact absorbing ability.

  The headband 34 has a length adjustment unit 50 (see FIG. 5) at a position corresponding to the back of the head of the wearer, and the wearer adjusts the circumferential length of the headband 34 by the length adjustment unit 50. It has a function that makes it possible to adjust to the head circumference.

  The helmet 10 further includes a string set 60 in order to prevent the helmet 10 from being detached from the wearer's head in a worn state. The strap set 60 includes left and right ear straps 62 and 62 depending from the headband 34, and a chin strap 64 having left and right ends depending on the left and right ear straps 62 and 62, respectively. The left and right ear straps 62, 62 are hooked on the wearer's left and right ears, and the chin strap 64 is hooked on the wearer's chin, and the helmet 10 is detached from the wearer's head by the joint action of both. Is prevented.

  Next, the hammock 30 will be described more specifically with reference mainly to FIGS.

  Fig.2 (a) is a figure which shows the hammock 30 in a planar development state. The hammock 30 includes a central portion 70 (a portion facing the wearer's head) and three suspension bands 72 extending radially outward from the central portion 70 at substantially equal angular intervals. Three end portions (free end portions not connected to the central portion 70) 74 of these three suspension bands 72 constitute an example of “three suspension band end portions”.

  In one example of the hammock 30, as shown in FIG. 2A, the central portion 70 has several through holes for weight reduction and air permeability improvement, but in another example, it is not illustrated. However, the central part 70 does not have a through hole.

  In one example of the hammock 30, as shown in FIG. 2A, three suspension bands 72 extend geometrically continuously from the central portion 70, but in another example, they are not illustrated. However, the central portion 70 is configured as a ring having several through holes, and three suspension bands 72 extend radially outward from three spatially different locations of the ring. Yes.

  As shown in FIG. 2A, the three suspension bands 72 of the hammock 30 are arranged so as to be arranged at substantially equal angular intervals in the plan view of the helmet 10. Further, the three suspension bands 72 are arranged so as to be substantially symmetrical with respect to the front-rear direction reference line passing through the center point of the helmet 10 in the plan view of the helmet 10.

  Specifically, among the three suspension bands 72, the uppermost one shown in FIG. 2A is disposed on the frontal portion of the cap body 20 in the plan view of the helmet 10, and the remaining two bands The hammock 30 is attached to the helmet 10 so that the suspension bands 72 are respectively disposed on the left and right sides of the cap body 20.

  As shown in FIG. 2A, the hammock 30 has several through holes in portions other than the central portion 70 in order to reduce weight and improve air permeability.

  2 (b), 3 (a) and 3 (b) are perspective views showing how the suspension band ends 74 of the suspension bands 72 of the hammock 30 are connected to the connection portions 80 of the cap body 20. FIG. It is. Of the inner surface 81 of the cap body 20, three connecting portions 80 are formed in a portion close to the outer peripheral edge 36, and are formed so as to be arranged at substantially equal angular intervals in a plan view of the helmet 10. Further, these three connecting portions 80 are arranged so as to be substantially symmetrical with respect to the front-rear direction reference line passing through the center point of the helmet 10 in a plan view of the helmet 10.

  Each connecting portion 80 has a cantilevered and thin plate-like movable piece 82, and the movable piece 82 has a free end portion 84 and a base end portion 86. The base end portion 86 is coupled to the inner surface 81 of the cap body 20 via an elastic hinge 88, whereby the movable piece 82 is coupled to the inner surface 81 of the cap body 20 in a cantilever manner. The free end 84 is elastically bent with respect to the inner surface 81 of the cap body 20 when an external force is applied.

  A male portion 90 is formed at the free end portion 84, while a female portion 92 is formed at the base end portion 86.

  In order to enable detachable connection with the connecting portion 80 configured in this manner, the corresponding suspension band end 74 has a through hole 100, a movable piece 104 having a male portion 102, a female portion 106, It has a hole 108 and a holder 110.

  The through hole 100 penetrates the corresponding suspension band end portion 74 in the thickness direction. The movable piece 104 is located inside the through hole 100 and is coupled in a cantilever manner to the upper portion 114 of the portion of the corresponding suspension band end portion 74 that forms the through hole 100. A connecting portion between the movable piece 104 and the portion 114 functions as an elastic hinge. A male portion 102 is formed at a free end portion of the movable piece 104 so as to protrude toward the inner surface 81 of the cap body 20. The male part 102 is detachably engaged with the female part 92 on the cap body 20 side.

  A female portion 106 is formed in a portion of the suspension band end portion 74 below the through hole 100. The male portion 90 of the cap body 20 is detachably engaged with the female portion 106.

  A hole 108 is formed in a portion of the suspension band end portion 74 between the male portion 102 and the female portion 106. The free end 84 of the movable piece 82 of the cap body 20 is inserted into the hole 108. The limit that the suspension band end portion 74 is spaced radially inward from the inner surface 81 of the cap body 20 is that the portion of the suspension band end portion 74 that forms the hole portion 108 and the back surface of the movable piece 82 of the cap body 20. It is defined by contact. As a result, the hammock 30 is prevented from separating radially inward from the inner surface 81 of the cap body 20.

  A first engaging portion is formed by the female portion 92 of the cap body 20 and the male portion 102 of the suspension band end portion 74, and the male portion 90 of the cap body 20 and the female portion 106 of the suspension band end portion 74 Thus, a second engagement portion is formed. In any of the engaging portions, a gap is formed so that relative displacement in the direction along the length direction of the suspension band 72 between the corresponding male and female portions is allowed. As a result, the suspension band 72 is in a certain range along the length direction of the suspension band 72 (the circumferential direction of the inner surface 81 of the cap body 20) with respect to the inner surface 81 in a connected state with the inner surface 81 of the cap body 20. It is possible to make a relative displacement.

  On the premise of such a loose connection between the suspension band 72 and the cap body 20, the buffer body 130 is interposed between the cap body 20 and the suspension band end portion 74 in all the connection portions 80. In one example, specifically, as shown in FIG. 3B, among the forward facing surface of the movable piece 82 and the front end portion 120 of the suspension band end portion 74, the rearward facing surface facing the forward facing surface of the movable piece 82. A buffer 130 is interposed between the two. The buffer 130 is held by a holder 110 formed at the tip 120 of the suspension band end 74. The holder 110 has a bottom portion, and the upper surface of the bottom portion constitutes the rearward surface.

  Therefore, in a state where no impact is applied to the cap body 20 from above (when no load is applied), as shown in FIG. 4A, no compression force is applied to the buffer body 130 or only a small compression force is applied. do not do.

  On the other hand, when an impact is applied to the cap body 20 from above, the cap body 20 descends relative to the hammock 30 as shown in FIG. In any case, relative displacement between the cap body 20 and the hammock 30 occurs in the direction in which the buffer body 130 is compressed.

  When the buffer body 130 is compressed, the kinetic energy is converted into strain energy, and the strain energy is stored in the buffer body 130 as shock absorption energy. As a result, the impact input to the cap body 20 is not directly transmitted to the hammock 30, but the impact input to the cap body 20 is partially absorbed by the buffer body 130 and transmitted to the hammock 30. Since the hammock 30 itself has an impact absorbing function, according to the present embodiment, the addition of the shock absorber 130 improves the overall shock absorbing capacity of the helmet 10 compared to the case where the shock absorber 130 does not exist.

  That is, when an impact acts on the cap body 20, a force transmission system is formed in which the cap body 20, the buffer body 130, and the hammock 30 are connected in series with each other. It is absorbed by the buffer body 130 as well.

  In the present embodiment, the hammock 30 absorbs the impact by its own expansion (elongation), whereas the shock absorber 130 absorbs the impact by its own compression (contraction).

  Furthermore, in the present embodiment, in consideration of such a difference in shock absorption direction, when the force transmission system receives an impact on the helmet 10, the hammock 30 compresses (presses) the buffer body 130 in the first direction. On the other hand, the cap body 20 is compressed (compressed) in the second direction intersecting the first direction so that the hammock 30, the buffer body 130, and the cap body 20 are connected to each other. Composed.

  Specifically, in the force transmission system shown in FIG. 4, the first direction is upward, while the second direction is downward, such that the directions are opposite to each other.

  Examples of the material of the buffer 130 include ethylene rubber (MISUMI RBPM5-30), silicon (MISUMI RBAM5-30), D3O (registered trademark) developed by D3O-lab, and alpha gel (trade name) marketed by Tyca Corporation. (Registered trademark), an NP gel (a foam of the above-mentioned alpha gel) marketed by Taika Co., Ltd., and the thickness is, for example, 5 mm, 10 mm, 15 mm.

  By the way, in this embodiment, since the hammock 30 absorbs shock by stretching, the shock absorber 130 absorbs shock by compression. Therefore, the shock absorber 130 uses a material that absorbs compressive force. It is manufactured. Therefore, it is impossible to manufacture the hammock 30 using the same material as the buffer body 130.

  Therefore, in the present embodiment, the force generated in each part of the helmet 10 in response to the impact on the helmet 10 acts as a tensile force on the hammock 30 and acts as a compressive force on the shock absorber 130. Further, the directions of the acting forces of the hammock 30 and the buffer body 130 are made different from each other, so that both the hammock 30 and the buffer body 130 can simultaneously absorb the shock with respect to the same shock. In order to achieve this, the force transmission system is configured as described above.

  As shown in FIG. 2A, the hammock 30 further includes a plurality of locking portions 150 in order to enable detachable connection with the headband 34. At least one locking portion 150 is provided for each suspension band 72. FIG. 2C is a perspective view showing a state in which the headband 34 is attached to the hammock 30.

  As shown in FIG. 2C, each locking part 150 has a male part 152. The distal end portion of the male portion 152 is a wide portion, while the proximal end portion is a narrow portion. On the other hand, the headband 34 has a female portion 154. The male part 152 is detachably and slidably attached to the female part 154.

  The female part 154 is located in a region allowing the male part 152 to be detached, that is, a wide region located on the left side in FIG. 2C and a region preventing the separation, ie, located on the right side in FIG. And a narrow region.

  The wide region of the female portion 154 allows the wide portion of the male portion 152 to pass through the headband 34 in its thickness direction. On the other hand, the narrow region of the female portion 154 allows the narrow portion of the male portion 152 to pass through the headband 34 in the thickness direction, but the wide portion of the male portion 152 passes the headband 34 thereof. Prevents passage in the thickness direction.

  Therefore, when the wide part of the male part 152 is inserted into the wide area of the female part 154 and the male part 152 is slid in this state, the narrow part of the male part 152 is now replaced with the narrow area of the female part 154. As a result, the male part 152 is prevented from detaching from the female part 154.

  The headband 34 has two female parts 154 arranged one above the other, and when the male part 152 is attached to the female part 154 selected by the wearer, the side view of the helmet 10 is obtained. The height of the hammock 30 relative to the headband 34 can be adjusted by the wearer.

  When analyzing the impact absorption mechanism of the helmet 10 in time series, when the impact on the helmet 10 is started, first, among the parts of the helmet 10, the hammock 30 extends to start absorbing the shock, In addition, the shock absorber 130 is contracted to absorb the impact.

  Thereafter, the cap body 20 receives and distorts the impact, whereby the cap body 20 relaxes the impact and the impact absorbing liner 22 absorbs the impact.

  In any case, in the helmet 10, the performance of the hammock 30 and the shock absorber 130 dominately determines the effect of reducing the obstacles caused by the impact on the wearer's head (particularly the brain).

  More specifically, the helmet 10 configured as described above operates as follows at the time of impact action.

  That is, as shown in FIG. 4, if an impact is applied to the cap body 20 as a result of collision of a fallen object or a flying object with the cap body 20, the three connecting portions 80 of the cap body 20 are almost simultaneously connected to the hammock 30. Each of the three suspension band end portions 74 is approached, and as a result, the shock absorbers 130 respectively installed on the suspension band end portions 74 are compressed. At this time, the impact applied to the cap body 20 is transmitted to the hammock 30 via the buffer body 130.

  According to the present embodiment, all the three suspension bands 72 of the hammock 30 are maintained in the tension state over the entire impact period from the start to the end of the impact on the helmet 10, whereby any suspension is performed. The band 72 also performs an impact absorbing function over the entire impact period. In addition, in the first approximately 2 msec phase of the entire impact period, that is, an important initial phase that affects the degree of damage that the impact causes to the wearer's head, the three hanging bands 72 of the hammock 30 are In either case, the transition from the relaxed state to the tensioned state almost simultaneously does not occur, and any suspension band 72 does not play in the relaxed state.

  The shock transmitted from the cap body 20 to the buffer body 130 is at least partially absorbed by the buffer body 130. Further, the impact transmitted from the buffer 130 to the hammock 30 is at least partially absorbed by the hammock 30. Therefore, the overall shock absorption capacity of the helmet 10 (that is, the total value of a plurality of shock absorption capacity realized by each part of the helmet 10) is mainly the shock absorption capacity of the hammock 30 and the shock absorption capacity of the buffer body 130. Equal to the ability added.

  Therefore, the helmet 10 has the same overall shock absorption capability (that is, the total value of the plurality of impact absorption capabilities realized by each part of the hammock 30) as the overall impact absorption capability of the hammock in the conventional helmet. Is designed, the overall impact absorption capacity of the helmet 10 is higher than the overall impact absorption capacity of a conventional helmet without the buffer 130.

In general, the impact energy U, which is the energy absorbed by an object when the object is subjected to abrupt tension or compression, has a stress of “σ”, a cross-sectional area of the object of “A”, and a length of the object of “L”. If the Young's modulus of the object is expressed as “E”, U = σ ² · A · L / (2 · E).

  When this equation is applied to the hammock 30 and the buffer 130, the Young's modulus E (for example, 20 kPa-1,500 kPa) of the material used for the buffer 130 is equal to the Young's modulus E (for example, 1.5 GPa) of the material used for the hammock 30. −3 GPa), and thus the buffer 130 is much larger than the hammock 30 for the term “1 / E” in this equation.

  On the other hand, in the above formula, the term “A · L” represents the volume of the object. On the other hand, the larger the volume, the more the weight of the object increases. Therefore, between objects having the same Young's modulus E, the heavier the object, the greater the impact absorption energy of the object.

  In the present embodiment, as described above, the material used for the buffer 130 is much larger than the material used for the hammock 30 with respect to the term “1 / E” in the above formula. It is possible to achieve the same shock absorption energy with less weight.

  Therefore, for convenience of explanation, when the shock absorption energy per unit weight is referred to as “shock absorption efficiency”, the material used for the shock absorber 130 is much larger than the material used for the hammock 30 with respect to the shock absorption efficiency. It will be.

  Therefore, in the case where it is sufficient if the helmet 10 is designed so that the overall impact absorption capacity of the helmet 10 is the same as the overall impact absorption capacity of a conventional helmet that does not have the buffer body 130, Part of the shock absorption energy of the hammock in the conventional helmet is realized by the shock absorption energy of the buffer body 130.

  In this case, the hammock 30 in the helmet 10 is smaller and lighter than the hammock in the conventional helmet. Instead, a buffer body 130 is added, but the material is buffered with a material having a higher impact absorption efficiency than the material of the hammock 30. A body 130 is constructed.

  As a result, compared to a conventional helmet that absorbs shock only with a hammock, the helmet 10 requires less total weight of the hammock 30 and the shock absorber 130 to achieve the same overall shock absorption capability. Therefore, according to this helmet 10, weight reduction becomes easy compared with the conventional helmet which does not have the buffer body 130. FIG.

  Furthermore, according to this helmet 10, since the number of the suspension band end portions 74 of the hammock 30 is 3, unlike the case where the number of the suspension band end portions 74 is four or more, it does not contribute to shock absorption. There is no end of the hanging band to play around. As a result, according to this helmet 10, it is possible to reduce the weight of the hammock 30 and thus to reduce the weight of the helmet 10 while realizing the same impact absorption capability as a hammock having four or more suspension band end portions 74. It becomes.

  Furthermore, in this helmet 10, the hammock 30 does not contact the wearer's head when the helmet 10 is worn, but is positioned below the hammock 30 and substantially exclusively on the wearer's head. The inner 32 which contacts contacts the wearer's head. The shape and size of the inner 32 do not depend on the shape and size of the hammock 30. Therefore, the shape and size of the inner 32 can be designed from the viewpoint of improving the wearing comfort and holdability of the helmet 10 regardless of the hammock 30.

  Therefore, according to this helmet 10, the defect which may arise due to the number of the suspension band end portions 74 of the hammock 30 being three is eliminated by an appropriate design of the inner 32, thereby It is possible to reduce the weight of the helmet 10 without sacrificing not only the shock absorbing ability of the helmet 10 but also the wearing comfort and holdability of the helmet 10.

  By the way, in general, with respect to a helmet, there is a case where adjustment of the length of the hammock is prohibited due to a standard regarding a protective cap. In this case, the depth of the helmet cover cannot be adjusted by the hammock.

  On the other hand, in the helmet 10 according to the present embodiment, not the hammock 30 but the inner 32 determines the depth of the helmet 10 covering. As described above, the effective length of each leg portion 42 of the inner 32 can be freely adjusted. Therefore, according to this helmet 10, it is possible for the wearer to freely adjust the depth of the helmet 10 without being affected by the standards related to the protective cap. Will improve.

  In addition, in this embodiment, in the present embodiment, the technique of setting the number of the suspension band end portions 74 of the hammock 30 to three, and the cap body 20 and the shock absorber 130 having higher shock absorption efficiency than the hammock 30, the cap body 20 and the hammock. 30, a technique of installing the inner 32 under the hammock 30, a technique for improving the wearing comfort of the helmet 10, and the inner 32 as a headband 34 in the side view of the helmet 10. It has been implemented in combination with techniques that allow it to be adjusted in height, thereby allowing the wearer to freely adjust the depth of the helmet 10 covering, Can be implemented separately from other technologies, or any two or three of those technologies can be selected to implement these two or three technologies It is possible to carry out together look.

  As mentioned above, some exemplary embodiments of the present invention have been described in detail with reference to the drawings. However, these are merely examples, and those skilled in the art, including the aspects described in the above [Summary of the Invention] section, may be used. The present invention can be implemented in other forms in which various modifications and improvements are made based on knowledge.

Claims (6)

A helmet worn on the head to protect the wearer's head,
A cap body having three connecting portions spatially separated from each other in a plan view of the helmet;
A hammock disposed inside the cap body, having three suspension band ends, each of which is connected to the three connection portions of the cap body ;
A holder provided at at least one of the three suspension band ends of the hammock;
A buffer body held by the holder, between the at least one suspension band end portion and the one corresponding to the at least one suspension band end portion among the three connecting portions of the cap body And what is provided in
A hole provided in an end of the at least one suspension band, and a movable piece extending from the corresponding connecting portion is inserted, and the at least one suspension is brought into contact with the movable piece and the hole. A three-point hammock-equipped helmet, including one in which a limit is set for the band end to be spaced radially inward from the cap body .   Furthermore, the inner side of the cap body is an inner part disposed at a position below the hammock in a side view of the helmet, and includes an inner part that contacts the head of the wearer when the helmet is worn. Item 3. A three-point hammock wearing type helmet. When an impact acts on the cap body, a force transmission system is formed in which the cap body, the buffer body, and the hammock are connected in series with each other. The three-point hammock-mounted helmet according to claim 1 or 2, wherein the helmet is also absorbed by a shock absorber. The shock absorber absorbs an impact by its own shrinkage,
In the force transmission system, when an impact is applied to the helmet, the hammock compresses the buffer body in the first direction, while the cap body compresses the buffer body in the second direction opposite to the first direction. The three-point hammock-mounted helmet according to claim 3, wherein the hammock, the shock absorber, and the cap body are connected to each other so as to be compressed. A helmet worn on the head to protect the wearer's head,
A cap having a generally hemispherical shell shape having three connecting portions spatially separated from each other in a plan view of the helmet;
When an impact acts on the cap body, it is a hammock that absorbs the impact, and is disposed inside the cap body, and has three suspension band end portions that extend radially in a plan view of the helmet, Those suspension band ends connected to the three connecting portions of the cap body,
An inner part of the cap body that is disposed at a position below the hammock in a side view of the helmet, and contacts the wearer's head when the helmet is worn, whereby the helmet Restricting the hammock from contacting the wearer's head in the wearing state of
A headband disposed inside the cap body and at a position below the inner in a side view of the helmet, and in a state of surrounding the wearer's head from the horizontal direction when the helmet is worn What to hold ,
A holder provided at at least one of the three suspension band ends of the hammock;
A buffer body held by the holder, between the at least one suspension band end portion and the one corresponding to the at least one suspension band end portion among the three connecting portions of the cap body And what is provided in
A hole provided in an end of the at least one suspension band, and a movable piece extending from the corresponding connecting portion is inserted, and the at least one suspension band is jointly formed by the movable piece and the hole. A three-point hammock wearing type helmet including a limit for the end portion to be spaced radially inward from the cap body . The inner and the headband are detachable and position-adjustable via a surface fastener structure in which a male side surface made of a pile surface or a loop surface and a male side surface made of a hook surface are detachably coupled to each other. 6. The three-point hammock-mounted helmet according to claim 5, wherein the three-point hammock-mounted helmet can be mounted so that a user can adjust the depth of the helmet cover.

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