JP2005213678A - Shock-absorbing liner for helmet and method for producing the liner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shock-absorbing liner for helmet, having high shock-absorbing performance, needing no expensive mold and producible at low cost, and to provide a method for producing the liner. <P>SOLUTION: The method for producing the shock-absorbing liner comprises the following way: V-shaped notches 28 are formed on a molded form 20 molded with a mold in advance, the resultant molded form is bent so that the oblique sides of the notches 28 are mutually contacted with each other, the pairs of mutually contacted oblique sides are then heated and welded by a heating element and temperature is then allowed to fall with the status left intact. Then, the welded oblique sides are firmly set, enabling the molded form 20 as a whole to be formed to a curved shape with a predetermined curvature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shock absorbing liner for a helmet, which is a main part of a helmet that protects the head.

A helmet that protects the head is generally a multilayer structure in which a foam reinforced plastic shock absorbing liner is provided in a fiber reinforced resin shell, and a sponge internal pad is provided in the shock absorbing liner. . Among these, the impact absorbing liner is a member that absorbs impact energy, and many use foamed polystyrene. Various materials have been studied from the viewpoint of productivity and the like, and one of them has been proposed to employ a honeycomb (see, for example, Patent Document 1).
JP-A-9-105013

FIG. 18 is a reproduction of FIG. However, the code was reassigned and some element names were added.
This shows that a honeycomb block 104 composed of a large number of honeycombs 102 formed of a thin plate material 103 is attached to the shell body 101 of the helmet 100.

  In order to manufacture a honeycomb block 104 composed of a large number of honeycombs 102, thin plates having different thicknesses are stacked in a coil shape at both ends, and the thin plates are fixed at predetermined positions and expanded to form a honeycomb block 104 having a given shape. Assembling as a liner inside the shell body 101 of the helmet 100.

However, since the contour of the human head can be considered as a collection of various spherical surfaces, the curvature differs at least between the top of the shell body 101 and the back of the head.
On the other hand, when the honeycomb block 104 made by processing and expanding into a coil shape with a certain curvature is assembled inside the shell body 101, the curvature of the top of the shell body 101 is smaller than the curvature of the occipital region. As a result, the mesh size of the honeycomb 102 is larger than that of the occipital region, and the mesh size of the honeycomb 102 is smaller than that of the apex portion of the occipital region.

Different eye sizes result in a difference in impact energy absorption performance. That is, it is not always possible to dispose the honeycomb 102 having the necessary shock absorbing performance at a necessary portion only with the honeycomb block 104 having a specific curvature.
Therefore, in order to ensure the necessary shock absorbing performance at the necessary portion, it is necessary to prepare a plurality of honeycomb blocks 104 having different curvatures and to assemble them inside the shell body 101.

When assembling a plurality of honeycomb blocks 104 having different curvatures to the shell body 101, the surfaces on the head side of the honeycomb blocks 104 having different curvatures are assembled so as to be smoothly connected so as to obtain an appropriate wearing feeling. It is necessary to attach.
When assembling a plurality of honeycomb blocks 104 so that the head-side surface is smoothly connected to the shell body 101, it is desired to improve the efficiency of the assembling process.

  On the other hand, a method of integrally forming the honeycomb block 104 using a mold is conceivable.

  Since the integrally formed honeycomb block 104 has a structure composed of a large number of honeycombs 102 raised vertically to the curved surface of the head, it is desired that the mold structure be simplified.

  An object of the present invention is to provide an impact-absorbing liner for helmets that has good impact-absorbing performance, does not require an expensive mold, and can be manufactured at low cost, and a method for manufacturing the same.

  The invention according to claim 1 is a mold forming step for obtaining a molded body having a wall portion standing in a lattice shape using a molding die, a cutting step for making a V-shaped cut into the wall portion of the molded body, and V For a helmet comprising a molded body bending step for bending a molded body so that a pair of hypotenuses constituting a letter-shaped incision come into contact with each other, and a heating step for heating the cut above the melting point so that the pair of hypotenuses are welded together It is a manufacturing method of an impact-absorbing liner.

The shape of the molded body having a wall portion standing in a lattice shape at the bottom obtained in the mold forming step is a shape constituted only by vertical and horizontal surfaces. For this reason, it is easy to process and finish the cavity of the mold, and a mold having a simple structure can be obtained.
As a result, it is possible to reduce the cost of the mold in the mold forming process.

The molded body can change the V-shaped cutting angle depending on the part in the cutting process.
Further, by heating and fixing the molded body curved in accordance with the V-shaped cut, a liner having a necessary curvature can be easily manufactured.
Since the required curvature can be obtained, only one type of molded body is required. Prepare a molded body, and prepare multiple molded bodies with different cutting angles to match the curvature of the shell body, depending on the mounting part of the shell body. It ’s fine.
Therefore, since only one type of mold is required, the cost of the mold can be reduced.

Also, by changing the cutting angle, the size of the eyes set up in a lattice shape can be arbitrarily adjusted, so there is no possibility that the shock absorbing performance will deteriorate.
Therefore, according to the first aspect, it is possible to easily manufacture a honeycomb block having a liner having the necessary shock absorbing performance and curvature at low cost.

  The invention according to claim 2 is a mold forming step for obtaining a molded body obtained by combining a corrugated wall including a curved surface and a flat surface in a lattice shape using a molding die, and softening for heating the molded body to a temperature equal to or higher than a softening point. Shock absorption for helmets comprising a step, a bending step of bending the molded body into a predetermined shape while curving the curved surface, and a shape stabilization step of stabilizing the shape by cooling the curved molded body It is a manufacturing method of a liner.

The molded body is a combination of corrugated walls having regularity in a lattice shape, and a mold having a simple structure can be used to form the molded body.
In addition, since the molded body has already been softened in the softening process, the molded body can be easily bent into a molded body having a predetermined curvature by bending the curved surface of the corrugated wall in the bending process.
Since the bending process mold and the fixed jigs and tools need only have a function of bending the softened molded body, complicated and expensive molds and jigs are not required.

  Furthermore, in the shape stabilization step, the curved surface of the corrugated wall curved by the cooling means can be quickly stabilized to a shape having a predetermined curvature.

In addition, since the size of the eyes of the wall portion standing in a lattice shape can be set arbitrarily, it is possible to obtain the impact absorption performance required by the site.
Therefore, according to the second aspect, it is possible to easily manufacture a liner having necessary shock absorbing performance and curvature at low cost.

  According to a third aspect of the present invention, there is provided a helmet comprising a shell body, an impact absorbing liner provided inside the shell body, and an interior pad that is provided inside the impact absorbing liner and contacts the head, wherein the impact absorbing liner is curved. The impact of a helmet with a plurality of walls standing from the interior pad side surface, which is a convex surface, to the shell body side surface, which is a curved concave surface, with the walls standing in a grid using a mold The molded body of the absorbent liner is characterized in that the curvature of the liner is adjusted to match the inner surface of each part of the shell body of the helmet by adjusting the difference in length between the upper side and the lower side of the lattice wall. To do.

By adjusting the difference between the lengths of the upper and lower sides of the wall in a lattice shape, the curvature of the liner is formed to match the inner surface of each part of the helmet shell. The curvature of the liner can be adjusted in accordance with the shape of each part, and it can be applied to various helmets.
Further, the curvature of each part can be adjusted with respect to the shape on the pad side.
Thereby, it can be set as the liner which matched the shape appropriately to a shell body and a head, and also it becomes possible to ensure predetermined shock absorption performance.

  The invention according to claim 4 is characterized in that the wall portion is formed by combining corrugated walls composed of a curved surface and a flat surface in a lattice shape.

Since the wall portion is formed by combining corrugated walls composed of a curved surface and a flat surface in a lattice shape, the curved surface of the corrugated wall can be easily expanded and contracted by heating these corrugated walls to a temperature equal to or higher than the softening point.
Since the curved surface of the corrugated wall is expanded and contracted and the liner is molded in accordance with the curvature of the shock absorbing liner in accordance with the curvature of the surface on the shell body side, the shock absorbing liner can be easily brought into close contact with the shell body and assembled.
As a result, the efficiency of the assembly process can be improved.

The invention according to claim 5 is characterized in that the shell body side surface has bottom portions, and these bottom portions are provided with holes.
Since the shell body side surface has bottom portions and these bottom portions are provided with holes, it is possible to ensure a predetermined shock absorbing performance, and to save material and reduce weight.

  In the invention according to claim 1, since the molded body is curved according to a V-shaped cut and a pair of hypotenuses constituting this cut is contacted, heated, and welded, a single molded body is necessary. There is an advantage that a liner having excellent shock absorbing performance can be manufactured at low cost.

  In the invention according to claim 2, since the curved surface of the molded body in which the molded corrugated walls are combined in a lattice shape is heated and curved, and the curved surface is cooled, the required shock absorbing performance can be obtained with one molded body. There is an advantage that a liner having a can be manufactured at low cost.

In the invention according to claim 3, the curvature of the shock absorbing liner is formed in advance according to the inner shape of the helmet by changing the lengths of the upper side and the lower side of the wall portion standing in a lattice shape. The curvature of the liner can be adjusted according to the shape of each part inside the shell body, and it can be applied to various helmets.
As a result, it is possible to obtain a liner having a shape appropriately matched to the shell body and the head, and there is an advantage that a predetermined shock absorbing performance can be ensured.

In the invention which concerns on Claim 4, the corrugated wall which comprises a wall part is combined in a grid | lattice form, a corrugated wall is heated to predetermined temperature, and the curved surface of a corrugated wall can be expanded-contracted easily.
Since the curved surface of the corrugated wall is expanded and contracted and the curvature of the liner is adjusted to the curvature of the surface on the shell body side, the shock absorbing liner can be easily brought into close contact with the shell body and assembled.
As a result, there is an advantage that the efficiency of the assembly process can be improved.

  In the invention which concerns on Claim 5, since it has a bottom part in the surface at the side of a shell body and was equipped with the hole part in these bottom parts, while being able to ensure predetermined | prescribed shock absorption performance, the advantage that reduction of material and weight reduction can be aimed at There is.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a diagram showing a molding step of the method of the present invention.
A mold 15 comprising a movable mold 12 having a cavity 11 corresponding to the shape of the molded body and a fixed mold 14 having a spool 13 for guiding the molten resin to the cavity 11 is prepared.
Then, by injecting the molten resin plasticized by the injection cylinder 16 into the cavity 11 via the spool 13, a mold forming step is performed to obtain a molded body.

FIG. 2 is a plan view of a molded body produced by the method of the present invention, and shows the molded body 20 molded in the mold forming step.
The molded body 20 has a lattice-like wall portion 22 standing from the bottom 21 at the back of the drawing in front of the drawing.
And the wall part 22 consists of vertical side wall part 23a, 23b, 23c ... (... shows two or more, the same hereafter) and horizontal side wall part 24a, 24b, 24c .... Further, the vertical side wall portions 23a, 23b, 23c,... And the horizontal side wall portions 24a, 24b, 24c,.

  A plurality of inner wall portions 61 including inner wall portions 61a, 61b, 61c, and 61d are provided in each section of the surface of the wall portion 22 on the pad 42 side.

3 is a cross-sectional view taken along the line 3-3 in FIG. 2, and the wall portion 22 stands in a lattice shape from the bottom portion 21, and the inner wall portion 61... (61a. ···)
The molded body 20 is a member configured around the vertical and horizontal surfaces of the wall portion 22. For this reason, it is easy to process and finish the cavity of the mold, and the molded body 20 can be formed with a mold having a simple structure.
As a result, the mold cost of the mold forming process can be suppressed.

FIG. 4 is an arrow view of the molded body produced in the cutting process of the method of the present invention. The molded body 20 molded by the mold molding process is cut into vertical wall portions of the wall section 22 of the molded body 20 by the cutting means. 23a, 23b, 23c... And V-shaped cuts 28., 24b, 24b, 24c... Formed at right angles to the vertical side walls 23a, 23b, 23c. .. indicates that a plurality of inner wall portions 61 are added to the upper surface portion of the wall portion 22.
These inner wall portions 61 are parts to be assembled in close contact with the surface on the pad side of the helmet.

Returning to FIG. 3, each side of the inner wall portion 61, which is brought into close contact with the surface on the pad side, can be regarded as the upper side 71, of the wall portion 22 erected in a lattice shape, and the length 71 L of the upper side 71. And the length 72L of the lower side 72..., That is, (72L-71L) was adjusted at various points so that the curvature of the liner matched the inner surface of the helmet shell body.
Therefore, the curvature of the liner can be adjusted in accordance with the shape of various parts inside various shell bodies, and various helmets can be handled.

Further, the curvature of each part can be adjusted with respect to the shape on the pad side.
Thereby, it can be set as the liner which matched the shape appropriately to a shell body and a head, and also it becomes possible to ensure predetermined shock absorption performance.

In the cutting step, the molded body 20 can be easily manufactured with a predetermined cutting angle by changing the V-shaped cutting angle depending on the part.
The thickness of the bottom of the molded body 20, the lengths of the vertical and horizontal walls, the height, the thickness, and the V-shaped cutting angle can be arbitrarily set.

The cutting means is preferably a fusing means such as a laser or an arc, but is not limited to fusing, and may be a cutting means using a cutter or other blade.
Moreover, in one molded object 20, it is possible to change said length, height, thickness, and a V-shaped cutting angle by a site | part.

  Further, in a mold forming process for obtaining a molded body having a wall portion standing in a lattice shape at the bottom using the mold 15 (see FIG. 1), the V-shaped cut 28 is inserted into the cavity 16 of the mold 15. If formed, it is possible to make a V-shaped cut in the wall part in the mold forming process, and it is also possible to adopt a method of omitting the cutting process for making a V-shaped cut in the wall part of the molded body.

  FIG. 5 is an operation diagram of a V-shaped cut according to the present invention, in which a molded body with V-shaped cuts 31, 32, 33 is bent and formed into a shape having a predetermined curvature for each part. Explain that you can.

In (a), a V-shaped cut 31 having a cut angle of θ1 is inserted into the wall portion 22 and a V-shaped cut 32 having a cut angle of θ2 is inserted next to the wall portion 22. Similarly, the cut angle is θ3. A certain V-shaped cut 33 is made.
Next, the wall portion 22 is curved so as to be concave upward as a whole. Due to this bending, the pair of hypotenuses 34a and 34b constituting the cut 31 come into contact with each other. Similarly, a pair of hypotenuses 35a and 35b constituting the cut 32 abut and a pair of hypotenuses 36a and 36b constituting the cut 33 abut.

In (b), the V-shaped cuts 31, 32, and 33 form a single line when the pair of hypotenuses 34a and 34b come into contact with each other. Similarly, 35a and 35b, and 36a and 36b are in contact with each other to form a single line.
As a result, the upper edge of the wall portion 22 becomes a polygon bent at angles θ1, θ2, and θ3. Accordingly, the desired curvature can be obtained very easily by setting the angles θ1, θ2, and θ3.

FIG. 6 is an explanatory diagram of the bending process of the molded body, and a specific example of the bending process of the molded body 20 will be described.
An upper mold 17 having a convex surface 17a and a lower mold 18 having a concave surface 18a are prepared. Next, the molded body 20 is placed on the lower mold 18 and the upper mold 17 is lowered to curve the molded body 20.
Then, the pair of oblique sides of the V-shaped cut 28 come into contact with each other. Further, as will be described later, the end surface portions 62 (see FIG. 3) of the plurality of opposing inner walls provided on the upper surface of the wall portion 22 (see FIG. 4) also come into contact with each other.

  In the present embodiment, the molded body 20 was bent by a mold, but if it can be set so that the hypotenuses of the V-shaped cuts of the molded body and the end face portions of the inner wall are in contact with each other, that means Is not limited to molds. For example, the molded body may be curved and fixed with a jig or the like.

  FIG. 7 is an explanatory diagram of the heating process, in a state where the molded body 20 is bent in the molded body bending process and set so that the V-shaped cuts 28 of the molded body and the end face portions of the inner wall portions are in contact with each other. It shows that the heating element 39 composed of the heating elements 39a, 39b, 39c, and 39d arranged in the upper mold 17 is heated, and the V-shaped cut and the end face of the inner wall are heated to the melting point or higher.

  In the present embodiment, the heating element 39 is disposed in the upper mold 17. In the molded body bending process, the position of the heating element 39 in the heating process may be arranged inside the mold / jig, on the surface of the mold / jig, or from the mold / jig. They may be arranged apart from each other, and there is no restriction on the position where the heating element is arranged.

FIG. 8 is a perspective view of a molded body produced in the heating step of the method of the present invention.
In the heating step, the pair of oblique sides of the V-shaped cut of the molded body 20 and the end surfaces of the inner wall portions are heated and welded to the melting point of the molded body or lower, and the temperature is lowered as it is. The end surface portion of the inner wall portion is fixed, indicating that the molded body 20 can be molded into a curved shape as a whole.
Through the molded body bending step and the heating step, the opposing end surface portions 62 of the inner wall portion 61 are welded, the inner wall portions 61 are butted together, and the ceiling surface that is substantially the same as the curvature of the surface on the interior pad 42 side. 63 is formed.

Returning to FIG. 4, the contact between the end surface portions of the inner wall portion will be described more specifically. In the forming body bending process using a mold, the opposite end surface portions 62 of the inner wall portion 61 come into contact with each other.
At this time, by adjusting the size of the inner wall portion 61 at various locations, the various locations on the liner can have a predetermined curvature.

FIG. 9 is a cross-sectional view of the completed helmet shock absorbing liner.
It shows that the molded body 20 manufactured by the method of the present invention is assembled as the shock absorbing liner 43 for the helmet inside the shell body 41 of the helmet 40.

  More specifically, it is a helmet comprising a shell body 41, an impact absorbing liner 43 provided inside the shell body 41, and an interior pad 42 provided inside the impact absorbing liner 43 and in contact with the head. 43 designates a plurality of vertical side wall portions 23... From the surface on the interior pad 42 side which is a curved convex surface toward the surface on the shell body 41 side which is a curved concave surface, and the pads of these vertical side wall portions 23. The surface on the 42 side has a plurality of inner wall portions 61... And these inner wall portions 61... Are formed so as to match the curvature of the surface on the pad 42 side.

Since the surface on the side of the pad 42 has a plurality of inner wall portions 61... And these inner wall portions 61... Are formed so as to match the curvature of the surface on the side of the pad 42, predetermined shock absorption performance can be easily achieved. Can be secured.
Therefore, according to the present invention, it is possible to easily manufacture a shock absorbing liner for helmets having necessary shock absorbing performance and curvature at low cost.

Hereinafter, another embodiment will be described.
A different point in another embodiment is that the inner wall portion is not provided on the upper surface portion of the wall portion, and the bottom plate is provided on the bottom portion of the wall portion, and the description will be made with reference to FIGS.

FIG. 10 is a view of another embodiment of FIG. 2 and shows a molded body 20 molded in the mold molding process.
The molded body 20 has a lattice-like wall portion 22 standing from the bottom 21 at the back of the drawing in front of the drawing.
The bottom portion 21 is a member that includes a bottom plate 26 and includes a small bottom portion 25 that is divided by vertical and horizontal lattices, and a hole portion 27 that is formed in the bottom plate 26 of each small bottom portion 25. .
Since the hole portion 27 is provided in the bottom portion 21, material saving and weight reduction can be achieved.

11 is a cross-sectional view taken along line 11-11 of FIG. 10, and is a member in which a large number of holes 27 are formed in the bottom portion 21 and the wall portion 22 is erected from such a bottom portion 21. FIG. As described above, the inner wall portion 61 (see FIG. 3) is not provided on the upper surface portion of the wall portion 22.
However, a bottom plate 26 is provided on the bottom 21 divided vertically and horizontally, and holes 27 are formed in a part of these bottom plates 26.

Since the bottom portion 21 includes the hole portion 27, it is possible to reduce the material and reduce the weight while securing a predetermined shock absorbing performance.
As is apparent from the drawing, the molded body 20 is a member having a shape mainly composed of vertical and horizontal surfaces. For this reason, it is easy to process and finish the cavity of the mold, and the molded body 20 can be formed with a mold having a simple structure.
As a result, the mold cost of the mold forming process can be suppressed.

  FIG. 12 is a diagram showing another embodiment of FIG. 4, and the molded body 20 molded by the molding process is cut by the vertical side wall portions 23 a, 23 b, 23 c... Of the wall portion 22 of the molded body 20. And the vertical side wall portions 23a, 23b, 23c,... And the lateral side wall portions 24a, 24b, 24c,. .

  FIG. 13 is a view of another embodiment of FIG. 8 and shows a molded body 20 that does not have an inner wall portion on the upper surface of the wall portion 22. Description is omitted.

  FIG. 14 is a view showing still another embodiment of FIG. 2, and shows a molded body 20 formed by using a mold in the mold forming step. The molded body 20 is a member formed by combining a large number of corrugated walls 47 composed of a curved surface 45 and a flat surface 46 in a lattice shape.

FIG. 15 is a cross-sectional view taken along line 15-15 of FIG. 14 and shows that the lattices 48a, 48b, 48c, 48d,.
Since the molded body 20 is a combination of the corrugated walls 47 having regularity in a lattice shape, the molded body 20 can be easily formed with a molding die having a simple structure.
Although not shown in the drawing, a bottom plate may be added to a part of the bottom. Alternatively, an inner wall part may be added to a part of the upper surface part of the wall part.

FIG. 16 is an action diagram of the corrugated wall according to the present invention, and the softened molded body 20 is curved by expanding and contracting the curved surface 45 of the corrugated wall 47 (see FIG. 14) combined in a lattice shape to obtain a predetermined curved surface shape. It shows that a honeycomb block with can be formed.
Hereinafter, the case where the molded body is molded so that the upper surface portion has a concave shape with a constant curvature and the lower surface has a convex shape with a constant curvature will be described.

  (A) shows the outline shape of the lateral wall 24 of the upper surface 51 (see FIG. 15) of the molded body 20, and the diameter of the curved surface 45 of the corrugated wall 47 before and after molding is D1 and D1A (D1> D1A). That is, the outline of the upper surface portion 51 of the molded body 20 shrinks in the direction opposite to the arrow a.

(B) shows the outline shape of the lower surface part 52 (refer FIG. 15) of the molded object 20, The diameter of the curved surface 45 which the corrugated wall 47 before shaping | molding and after shaping | molding has D1 and D1B (D1). <D1B). That is, the contour of the lower surface portion 52 of the molded body 20 extends in the direction of arrow a.
Therefore, by utilizing the expansion and contraction of the curved surface 45 of the corrugated wall 47, the molded body 20 can be easily formed into a curved surface having a predetermined curvature.

The molded body 20 having such a corrugated wall 47 (see FIG. 14) can be heated in the bending process by heating the molded body 20 to a temperature equal to or higher than the softening point, and on the upper surface portion 51 (see FIG. 15) side. It becomes a concave shape, and can be formed into a convex shape on the lower surface portion 52 side.
Then, it is solidified by cooling, and the shape can be stabilized.

FIG. 17 is a diagram showing still another embodiment of FIG.
In the shape stabilization step, after heating the molded body 20 to a temperature equal to or higher than the softening point, the molded body 20 is curved so as to have a predetermined curvature and then solidified by cooling to stabilize the shape and obtain the molded body 20. Show what you can do.

Since the curved surface 45 of the corrugated wall 47 heated to a temperature equal to or higher than the softening point is bent to form a shape having a predetermined curvature, the mold and the fixed jigs for bending in the curving process are softened corrugated walls 47. As long as it has sufficient rigidity to bend, the method is not limited.
As a result, complicated and expensive molds and jigs are not required.

  As for the cooling means for cooling and solidifying the molded body 20, a cooling pipe is provided in the mold, and a coolant such as water is passed through the cooling pipe to cool the molded body 20 after the bending process, thereby quickly stabilizing the shape. It is possible to There is no restriction | limiting in the position which arrange | positions this cooling means.

In addition, the vertical and horizontal length, height, thickness, and radius of the corrugated wall 47 can be arbitrarily set.
Further, it is possible to change only a part of the corrugated wall 47. For example, it is easy to make the vertical and horizontal length of the corrugated wall 47 at the top shorter than the vertical and horizontal length of the back of the head.

  Usually, the curvature of the shock absorbing liner is different between the frontal head, the top, and the back of the head, but the shaped body 20 is formed by combining the corrugated walls 47 including the curved surface 45 and the flat surface 46 in a lattice shape. The curved surface 45 of the wall 47 is curved, heated, cooled, and the shape is stabilized, whereby an impact-absorbing liner having a necessary curvature for each part can be integrally formed.

  Since the wall portion 22 is formed by combining the corrugated wall 47 composed of the curved surface 45 and the flat surface 46 in a lattice shape, the curved surface of the corrugated wall 47 can be easily expanded and contracted by heating to a temperature equal to or higher than the softening point.

The curved surface 45 of the corrugated wall 47 is expanded and contracted to form the liner so that the curvature of the shock absorbing liner 43 matches the curvature of the surface on the shell body side, so that the shock absorbing liner can be easily brought into close contact with the shell body 41 and assembled. it can.
As a result, the efficiency of the assembly process can be improved.

  Therefore, according to the present invention, it is possible to easily manufacture a shock absorbing liner for helmets having necessary shock absorbing performance and curvature at low cost.

In addition, this invention is applicable not only to a helmet but to a building structure, a general mechanical device, an industrial machine, etc. That is, the manufacturing method of the present invention can be applied to any lattice-shaped molded body having a curved shape without limiting the type.
Moreover, although the molded object shape | molded using the shaping | molding die is suitable for resin, such as a polypropylene, polyethylene, and polyamide, it may be made from metals, such as rubber | gum and aluminum, The kind is not ask | required.

  The shock absorbing liner for helmets of the present invention is suitable for helmets.

It is a figure which shows the shaping | molding process based on this invention. It is a top view of the molded object manufactured with the method of this invention. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is an arrow view of the molded object manufactured at the cutting process of this invention method. It is an effect | action figure of the V-shaped notch based on this invention. It is explanatory drawing of a molded object bending process. It is explanatory drawing of a heating process. It is a perspective view of the molded object manufactured at the heating process of this invention method. It is sectional drawing of the shock absorption liner for completed helmets. It is another Example figure of FIG. It is the 11-11 line sectional view of FIG. It is another Example figure of FIG. It is another Example figure of FIG. FIG. 3 is a view showing still another embodiment of FIG. 2. FIG. 15 is a cross-sectional view taken along line 15-15 in FIG. 14. It is an effect | action figure of the corrugated wall which concerns on this invention. FIG. 9 is a diagram showing still another embodiment of FIG. 8. It is a reprint figure of patent document 1. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 15 ... Mold, 20 ... Molded body, 21 ... Bottom part, 22 ... Wall part, 28 ... Incision, 30 ... Honeycomb block, 34a, 34b ... Inclination side of incision angle (theta) 1, 35a, 35b ... Inclination side of incision angle (theta) 2, 36a, 36b: hypotenuse of cutting angle θ3, 40 ... helmet, 41 ... shell body, 42 ... interior pad, 43 ... shock absorbing liner, 45 ... curved surface, 46 ... plane, 47 ... corrugated wall, 61 ... inner wall.

Claims (5)

A mold forming step of obtaining a molded body in which the wall portion is erected in a lattice shape using a mold;
An incision step for making a V-shaped incision in the wall of the molded body,
A molded body bending step of bending the molded body so that a pair of hypotenuses constituting the V-shaped cuts are in contact with each other;
A heating step of heating the notch to a melting point or higher so that the pair of oblique sides are welded;
A method for producing an impact-absorbing liner for helmets, comprising: A mold forming step of obtaining a molded body obtained by combining a corrugated wall including a curved surface and a flat surface in a lattice shape using a mold;
A softening step of heating the molded body to a temperature above the softening point;
A bending step of bending the molded body into a predetermined shape while bending the curved surface;
A shape stabilization step for solidifying the curved molded body by cooling and stabilizing the shape;
A method for producing an impact-absorbing liner for helmets, comprising: In a helmet comprising a shell body, an impact absorbing liner provided inside the shell body, and an interior pad that is provided inside the shock absorbing liner and contacts the head,
The impact-absorbing liner is a molded body formed by standing up a plurality of wall portions from a surface on the interior pad side that is a curved convex surface toward a surface on the shell body side that is a curved concave surface,
The molded article of the shock absorbing liner of the helmet, in which the wall portion is erected in a grid shape using a mold, adjusts the difference between the lengths of the upper side and the lower side of the wall portion of the grid, and the liner An impact-absorbing liner for a helmet, characterized in that the curvature is adapted to the inner surface of each part of the shell body of the helmet.   The shock absorbing liner for a helmet according to claim 3, wherein the wall portion is formed by combining corrugated walls made of a curved surface and a flat surface in a lattice shape.   4. The shock absorbing liner for helmets according to claim 3, wherein the shell body side surface has a bottom portion, and the bottom portion includes a hole portion.

Images