JP2018178351A - Helmet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety cap that can make an outer shape small and lightweight without lowering an impact absorption performance.SOLUTION: A safety cap 1 alleviates an impact added on a head top portion of a cap body 2, with its wearing body 3 extending upward relatively to a downward movement of the cap body 2 to approach an inner surface of the head top portion of the cap body 2, during a period from when the impact is added on the head top portion of the cap body 2 to when the cap body 2 is deformed by the impact. The wearing body 3 is provided with regulation parts 9 for regulating an elongation of the wearing body 3 when the head top portion of the wearing body 3 approaches the inner surface of the head top portion of the cap body 2 by a predetermined distance by upward elongation.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a helmet provided with a hard cap and a garment in contact with a human head.

  The helmet is provided with a cap body and an wearing body provided inside the cap body. The cap body is formed of a hard synthetic resin material or the like and covers and protects the human head from the outside. The wearing body includes a hammock forming a gap between the cap and the inner surface of the cap in contact with a human head, and a headband attached and fixed to the outer periphery of the head on the lower end side of the hammock. Both the hammock and the headband are made of a flexible material as compared to the cap body (see, for example, Patent Document 1).

  When an impact load is applied in a substantially vertical direction from the outer upper side of the cap body toward the top of the head of the human head, the hammock stretches until the cap body is deformed, the extension of the hammock at this time, and the cap body Impact energy is absorbed by the deformation.

  Such shock absorption performance is defined as a performance requirement in Japanese Industrial Standard ("industrial helmet" JIS T 8131: 2015). Specifically, low temperature treatment exposes the helmet to -10 ± 2 ° C environment for 4 hours or more, high temperature treatment exposes the helmet to 50 ± 2 ° C environment for 4 hours or more, and 25 ± 5 ° C underwater In any case, the impact force transmitted to the human head (model) needs to be 4.9 kN or less.

  At the time of the above-mentioned low temperature processing, the deformation of the cap body and the extension of the hammock upon impact are small. On the other hand, at the time of the above-mentioned high temperature treatment, the deformation of the cap body and the extension of the hammock upon impact are increased. Therefore, in the conventional helmet, the vertical distance of the space formed between the top of the hammock and the inner surface of the top of the cap in consideration of the same environment as the high temperature processing (hereinafter referred to as the inside vertical) The gap size is kept as large as possible so as not to inhibit the absorption of impact energy by the extension of the hammock in the cap body. The internal vertical clearance dimension is a dimension corresponding to the "inside vertical clearance" in the Japanese Industrial Standard ("industrial helmet" JIS T 8131: 2015).

Japanese Utility Model Publication No. 33-1240

  However, since the above-mentioned conventional helmet secures a large internal vertical clearance dimension, the outer shape (mainly the height dimension) of the cap is large. As a result, the top of the helmet interferes with the surroundings and not only the smooth movement of the wearer's work is impeded, but also the weight of the cap is heavy, resulting in a large burden on the wearer. In addition, by securing a large internal vertical clearance dimension, the center of gravity of the helmet is high, the helmet is easily displaced from the human head when worn, and the sense of stability in the worn state is low. For this reason, the wearer has to tighten the head band, the chin strap, etc., and there is a disadvantage that the wearer has a great discomfort at the time of wearing.

  In view of the above, it is an object of the present invention to provide a helmet that can be made smaller in size and lighter in weight without reducing the impact absorption performance.

  In order to achieve such an object, the present invention comprises a hard cap body and an installation body provided inside the cap body and in contact with a human head, from the time when an impact is applied to the top of the cap body. While the cap body is deformed by the impact, the wearing body extends upward relative to the downward movement of the cap body and approaches the top surface of the cap body of the cap body while approaching the top surface of the cap body. The helmet is disposed between the cap and the attachment, and the top of the attachment is the top surface of the top of the cap due to the upward extension of the attachment. And a restricting portion for restricting the extension of the wearing body when approaching to a predetermined distance.

  When a shock is applied to the cap from outside the cap, the wearing body extends upward, and the inner top of the cap approaches the top of the head of the human head. Then, when the top of the garment approaches the inner surface of the top of the cap to a predetermined distance, the regulating portion regulates the elongation of the garment. Thereby, the wearing body absorbs an impact until it is regulated by the regulating portion. Since the clothes are hardly stretched after being restricted by the restriction portion, it is not necessary to provide a large gap in advance above the clothes in consideration of the fact that the clothes are completely stretched.

  When the elongation of the wearing body is suppressed to a small extent, deformation of the cap body occurs to further absorb the impact. As described above, by suppressing the extension of the wearing body, it is possible to rapidly and largely generate an impact absorbing action due to the deformation of the cap body. Therefore, it is possible to reduce the vertical distance (internal vertical clearance dimension) of the space formed between the top of the garment and the inner surface of the top of the cap.

  And since the internal vertical clearance dimension can be made small, the external shape (especially the height dimension) of the cap can be made small. Along with this, the center of gravity position of the helmet can be lowered, and the stability upon wearing is improved.

  As one mode of the control section of the present invention, the control section is provided between the top of the cap and the top of the fitting. Among the gaps formed between the dressing and the cap, the largest gap is the gap between the top of the dressing and the inner surface of the top of the cap. Therefore, if the restriction portion is provided between the top of the cap and the top of the garment, freedom in design of the size and shape of the restriction is increased, and the upward extension of the wear is achieved. It becomes easy to set the dimensions of the top of the garment to be regulated and the inner surface of the top of the cap, and to set the internal vertical clearance.

  Moreover, as another aspect of the restriction part of the present invention, when the fitting body is brought into close contact with the human head model in Japanese Industrial Standard T8131: 2015, 55 mm downward from the crown of the human head model along the central axis of the human head. When the horizontal plane to be positioned is a reference horizontal plane, and the point at which the central axis of the human head intersects the reference horizontal plane is a reference point, the crown of the head is a portion above the reference horizontal plane, and the restriction part is a point from the reference point It is characterized in that a line extending within an angle range of 0 ° to 70 ° upward with respect to the reference horizontal plane is provided.

  According to this, the position at which the restricting portion is provided is a position where the change of the air gap due to the extension of the wearing body is relatively small. By restricting the extension of the attached body by the restricting portion at a position where the change in the space due to the extension of the attached body is relatively small, the restricting portion can be made into a small shape.

  Moreover, the said control part of this invention is formed in the shape protruded toward the inner surface of the said cap body from the said mounting body. At this time, the restricting portion may be provided in a state of being in contact with the inner surface of the cap body, or the top of the clothing body is the top inner surface of the cap body by the upward extension of the clothing body. Alternatively, the cap may be provided so as to abut on the inner surface of the cap body when approaching to a predetermined distance.

  When providing the restricting portion in contact with the inner surface of the cap, it is sufficient to project the restricting portion to a length equal to the size of the gap between the inner surface of the cap and the fitting, so the design of the restricting portion Can be made easy.

  When the restriction portion is configured to abut on the inner surface of the cap when the top of the garment and the inner surface of the top of the cap approach each other to a predetermined distance, the restriction position by the restriction is clear. The restriction position can be set accurately.

  Further, in the present invention, the restricting portion is characterized in that a load of 500 N or more is required in order to set a deformation amount at the time of compression to 2 mm.

  The regulation part of the present invention is not for the purpose of shock absorption, but regulates the approach of the cap body and the wearing body. For this reason, the regulating portion needs to have hardness (compression strength) for surely regulating the extension of the wearing body.

  Therefore, the inventors conducted a test to measure the load when the amount of deformation of the regulating portion is 2 mm. As a result, it was confirmed that when the load of less than 500 N causes a deformation of 2 mm, an impact absorbing action is generated by the restricting portion. Thus, the present inventors have required a load of 500 N or more to obtain a deformation amount of 2 mm in order to obtain an amount of deformation of 2 mm in order to control the extension of the wearing body when the wearing body approaches the cap body to a predetermined distance. It has been found that the hardness is as follows.

  The present invention is based on this finding. Therefore, according to the present invention, the formation of the restriction portion in a shape requiring a load of 500 N or more in order to set the deformation amount at the time of compression to 2 mm reliably restricts the approach of the wearing body to the cap body. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory perspective view which shows the principal part of the helmet of embodiment of this invention. Explanatory top view which shows the hammock in this embodiment in an expanded state. Explanatory sectional drawing of the helmet of this embodiment. Explanatory drawing which compares and shows the effect | action of the helmet of this embodiment with the conventional helmet.

  The helmet 1 mentioned as an embodiment of the present invention, as shown in FIG. 1, comprises a hard cap 2 (shown in phantom in the figure) and an attachment 3 provided inside the cap 2 and in contact with the human head. Configured The wearing body 3 includes a hammock 4 and a headband 5.

  The hammock 4 is integrally formed by injection molding using a synthetic resin (for example, a polyolefin-based synthetic resin) as a material, and a predetermined gap is formed between the human head and the cap 2 in contact with the human head.

  The headband 5 is fixed to the head by surrounding the head. A size adjustment means (not shown) is provided on the back of the head band 5 so that the circumferential length of the head band 5 can be adjusted according to the size of the human head by the size adjustment means.

  Further, as shown in FIGS. 1 and 2, the hammock 4 is an annular member which integrally connects a plurality of (four in the present embodiment) legs 6 radially extending from the top of the head and the upper ends of the legs 6. And a leg connecting portion 7. In the helmet 1 of the present embodiment, the position of the leg connecting portion 7 is the top of the head of the wearing body 3. The number of the legs 6 is usually four or eight, but can be appropriately selected according to the shape of the cap 2 and the use of the helmet 1.

  The lower end portion of each leg 6 is provided with a locking portion 8 which is detachably engaged with a locking projection (not shown) provided on the inner surface of the lower end portion of the cap body 2. Further, at the lower end side edge of each leg 6, a head band connecting portion 6a for connecting a head band is provided.

  Each leg 6 is flattened in the unfolded state removed from the inside of the cap body 2, and when assembled into the inside of the cap body 2, it has a curved shape corresponding to the human head. As described above, the flexible legs 6 and the leg connecting portions 7 expand when the cap 2 receives an impact from the upper side to the lower side, and absorbs the impact at that time.

  The wearing body 3 includes a regulating portion 9 formed in a polygonal cylindrical shape (a hexagonal cylindrical shape in the present embodiment shown in FIG. 1) or a solid protrusion. The restricting portion 9 is provided between the legs 6 of the hammock 4 via the belt-like support 10. Thereby, when the regulation part 9 is located between the cap body 2 and the hammock 4, the respective regulation parts 9 are the forehead side, the occipital side, the right side head side, and the left side head side of the cap body 2. It will be placed in the

  In the present embodiment, the regulation portion 9 is integrally provided at the central portion of the support portion 10, and the support portion 10 is stretched between and connected to each other between the leg portions 6 to be provided later. Although the restricting portion 9 may be formed of the same material as the leg 6 of the hammock 4, the restricting portion 9 may be formed of a material (elastomer) different from the hammock 4 by attaching the restricting portion 9 to the hammock 4 later. It becomes selectable.

  The position at which the restricting portion 9 is provided will be described in more detail. As shown in FIG. 3, when the restricting portion 9 sets a reference point C to be the intersection of the central axis A of the human head and the reference horizontal surface B, A line (such as a line F described later) extending within an angular range E of a position (shown by an imaginary line D) at an angle of 0 ° to 70 ° above the reference horizontal plane B is provided.

  The above-mentioned angle range E is preferably 20 ° to 60 ° upward with respect to the reference horizontal surface, but more preferably 40 ° to 50 ° upward with respect to the reference horizontal surface, the restriction portion 9 is It can be made small enough.

  Human head central axis A is a virtual line extending vertically through the center of the human head (human head model W in Japanese Industrial Standard T8131: 2015). The reference horizontal plane B is a virtual plane extending horizontally at a distance G of 55 mm from the top of the human head model W along the central axis A of the human head.

  The restricting portion 9 in the present embodiment is provided at a position where a line F extending upward at an angle of 45 degrees with respect to the reference horizontal surface B passes. In the present invention, the top of the head corresponds not only to the top of the head through which the central axis A of the human head passes, but also to a relatively wide area above the reference horizontal surface B.

  Further, in the present embodiment, the restriction portion 9 which is formed into a hexagonal cylindrical shape (see FIG. 1) has a shape that requires a load of 500 N or more in order to set the deformation amount at the time of compression to 2 mm. In addition, the deformation amount of the control part 9 used the measured value by the test performed by making a test speed into 100 mm / min using a compression tester.

  The action to the impact of the helmet 1 of this embodiment configured in this way will be described with reference to FIG. In FIG. 4, the action of the helmet 1 of the present embodiment is shown at the bottom, and the action of the conventional helmet 11 is shown at the top for comparison.

  In the “state 1” in which the impact condition is not worn, the conventional helmet 11 has an internal vertical clearance dimension H (the height of the space formed between the inner surface of the top of the cap 12 and the top of the hammock 13 Although a distance of 35 to 45 mm is required in the direction, the internal vertical clearance dimension J of the helmet 1 of this embodiment is 20 to 30 mm.

  Next, when the top of the cap bodies 2 and 12 is impacted by checking the state by dropping the hemispherical striker 20 for test, the results shown in the following "state 2" and "state 3" are observed. It was done.

  In the "state 2" of the conventional helmet 11, the hammock 13 is greatly extended, the top of the hammock 13 approaches the inner surface of the cap 12, and the lower edge of the cap 12 is further deformed to absorb the impact.

  In the conventional helmet 11, since the cap 12 and the hammock 13 are connected at the lower end far from the top of the head which is a striking point, deformation of the cap 12 is not smooth and Absorption of impact energy is insufficient. At this time, in order to prevent contact with the cap body 12 due to a large elongation of the hammock 13, it is necessary to set the internal vertical clearance dimension H in advance large.

  Thereafter, deformation of the cap body 12 occurs as in “state 3”, but in the deformation of the cap body 12 in “state 3” because the absorption of impact energy is insufficient in “state 2”, the impact energy Absorption does not take place efficiently.

  On the other hand, in the helmet 1 of the present embodiment, the restricting portion 9 restricts the extension of the hammock 4 before the hammock 4 largely extends in the “state 2”. At the same time, the descent of the cap 2 with respect to the human head is also regulated, and the approach between the top of the hammock 4 and the inner surface of the top of the cap 2 is stopped (or the approaching motion becomes extremely slow).

  By maintaining the state in which the extension of the hammock 4 is restricted, the deformation of the cap 2 progresses at the part where the restriction part 9 is restricting. That is, the cap body 2 is deformed early by transitioning to the “state 3”. At this time, in the cap body 2, the impact energy is absorbed smoothly by the deformation of the cap body 2 because the cap portion 2 is regulated by the regulating portion 9 at a position relatively close to the top of the head which is a striking point.

  As described above, according to the helmet 1 of the present embodiment, by providing the restricting portion 9 in the hammock 4, the expansion of the hammock 4 can be suppressed to a small degree, and absorption of impact energy by the cap body 2 can be efficiently exhibited. . Thereby, the helmet 1 of this embodiment can make the height dimension M of the cap 2 smaller than the height dimension N of the cap 12 of the conventional helmet 11.

  The restricting portion 9 may be provided on the top of the head of the hammock 4 (for example, the upper end of the leg 6, the upper surface of the leg connecting portion 7, or the vicinity of the leg connecting portion 7) other than the above-described position. Good.

  Further, in the present embodiment, when the restricting portion 9 does not restrict the extension of the hammock 4, the tip end of the restricting portion 9 is separated from the inner surface of the cap body 2 with a gap. Thus, when the restricting portion 9 contacts the inner surface of the cap 2 (when the top of the hammock 4 approaches the inner surface of the top of the cap 2 by the extension of the hammock 4 to a predetermined distance) Control the growth of hammock 4 from The predetermined distance is appropriately set based on the shape and material of the hammock 4, the internal vertical clearance dimension J, and the like, and can be set by adjusting the projecting dimension of the regulating portion 9.

  As a specific example, when the internal vertical clearance dimension J of the helmet 1 is 20 to 30 mm, the projecting dimension of the regulating portion 9 is preferably set in the range of 10 to 25 mm, and set in the range of 15 to 20 mm. More preferable.

  Besides this, although not shown in the drawings, the restricting portion 9 may be formed in a shape or a size in contact with the inner surface of the cap 2 in a state where the cap 2 is not subjected to an impact. In this case, the restricting portion 9 is deformed (collapsed) so as not to restrict the elongation of the hammock 4 until the distance to the inner surface of the cap body 2 becomes a predetermined distance (crush), and the hammock is extended by the upward extension of the hammock 4 When the top of the head 4 approaches the inner surface of the top of the head 2 by a predetermined distance, the deformation of the restricting portion 9 restricts the extension of the hammock 4.

  Moreover, since the control part 9 is not provided for the purpose of absorbing an impact, it is preferable to have hardness (compression strength) more than predetermined. The hardness of the restricting portion 9 is appropriately set according to the shape and the material, but specifically, the restricting portion 9 has a hardness that requires a load of 500 N or more to obtain a deformation of 2 mm. Is preferred.

  If the amount of deformation is 2 mm with a load of less than 500 N, there is a possibility that the elongation of the hammock 4 can not be sufficiently restricted. However, in order to make the amount of deformation during compression 2 mm, 500 N By forming the restricting portion 9 in such a shape that the above load is required, the approach of the fitting body 3 (hammock 4) to the cap body 2 can be reliably restricted.

  Moreover, in this embodiment, although the example which provided the control part 9 back to the hammock 4 and provided it was shown, the control part 9 is provided by integrally molding in the hammock 4 (the leg part 6, the leg connection part 7). May be

  Further, in the present embodiment, an example in which the restricting portion 9 is provided on the hammock 4 is shown, but the restricting portion 9 is formed separately from the hammock 4 and disposed between the cap 2 and the hammock 4 (for example, , Or may be provided by adhering to the inner surface of the cap 2 or the like.

  DESCRIPTION OF SYMBOLS 1 ... Helmet, 2 ... Cap body, 3 ... Dressing body, 9 ... Control part, A ... Human head central axis, B ... Standard horizontal surface, C ... Standard point.

Claims (6)

A hard cap body and an wearing body provided inside the cap body and in contact with a human head, and from when the impact is applied to the top of the cap body until the cap body is deformed by the impact The helmet further extends upward relative to the lower movement of the cap body to mitigate an impact applied to the cap top of the cap body while approaching the inner top of the cap body of the cap body.
The cap is disposed between the cap body and the wearing body, and when the top of the body of the wearing body approaches a predetermined distance with respect to the inner surface of the parietal head of the cap body by the upward extension of the wearing body, the wearing is performed A helmet characterized by comprising a regulation part which regulates the extension of the body.   The helmet according to claim 1, wherein the restriction portion is provided between the top of the cap and the top of the fitting. When the body is in close contact with the human head model according to Japanese Industrial Standard T8131: 2015, the horizontal plane located 55 mm below the central head axis of the human head model from the top of the human head model is taken as the reference horizontal plane. When a point where the horizontal plane intersects is a reference point,
The top of the head is a portion above the reference horizontal surface,
The helmet according to claim 1 or 2, wherein the restricting portion is provided at a position where a line extending within an angle range of 0 ° to 70 ° upward with respect to the reference horizontal surface from the reference point passes through. .   The said control part is formed in the shape which protrudes toward the inner surface of the said cap body from the said mounting body, and it is provided in the state contact | abutted on the said cap inner surface. The helmet according to any one of the above.   The restricting portion is formed to project from the attachment toward the inner surface of the cap, and the top of the attachment is on the inner surface of the top of the cap due to the upward extension of the attachment. The helmet according to any one of claims 1 to 3, wherein the helmet abuts against the inner surface of the cap body when approaching to a predetermined distance.   The helmet according to any one of claims 1 to 5, wherein the restricting portion has a shape that requires a load of 500 N or more in order to make a deformation amount at the time of compression 2 mm.