JP2019043676A - Core panel and buffer material - Google Patents

Abstract

To provide a panel and a buffer material comprising a core having a flange portion of an appropriate size.SOLUTION: A core panel (1) includes: a polyhedron (11) consisting of a plurality of equilateral triangle-like side wall portions (13), a base portion (12) to which each of the side wall portions (13) are connected, and a flange portion (14) formed in an isosceles trapezoid shape and protruding outward, in which, in an unfolded view, a length of an oblique side (AD) of the flange portion (14) is configured to form a rectangular triangle (ADC) in which an angle between an oblique side and a lower base of an isosceles trapezoid is 45°, a line between a barycenter (C) of the base portion (12) and a vertex (D) of an equilateral triangle that is the side wall portion (13) is a hypotenuse (CD), the oblique side (AD) is an another side, and an angle of a vertex (A) of an upper base side of the oblique side (AD) is a right angle; and a plate body (2, 3) for supporting a plurality of polyhedrons (11) in a state where the bases (12) of the polyhedrons (11) fill a whole plane thereof.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a core panel in which one or a plurality of cores are sandwiched between a pair of plate bodies and a cushioning material having the plurality of cores, and more particularly to a core panel and a cushioning material in which a polyhedral core is used.

Regarding a technique for assembling a lightweight and highly rigid panel, a technique described in Non-Patent Document 1 below is known.
In Non-Patent Document 1, an equilateral triangular upper flange portion is provided at the apex of a triangular pyramid cell, a trapezoidal lower flange portion is provided at the bottom of the triangular pyramid, welded to a pair of upper and lower plates, bolts A technique for assembling and creating a truss core panel by fixing with nuts, rivets and the like is described.

“Evaluation of bending rigidity of assembled lightweight high-rigidity structural panels”, Transactions of the Japan Society of Mechanical Engineers, Vol. 81, no. 828, (2015), pp. 1-15

(Problems of conventional technology)
In the technique described in Non-Patent Document 1, no consideration is given to the shape and size of the flange portion. When joining a triangular pyramid or quadrangular pyramid shaped cell (core) to a pair of plates, there is a problem that if the size of the flange is excessive, useless parts increase and the material cost increases. Moreover, when the size of the flange is small, there is a problem that the fixing to the plate becomes insufficient and the rigidity of the entire panel is lowered.
In addition, it is not efficient to examine and design the design method such as the flange shape dimension and the flange diameter and position of the joint each time. In addition, it cannot be theoretically designed no matter how long it is studied.

  This invention makes it a technical subject to provide the panel and buffer material which consist of a core which has a flange part of a suitable magnitude | size.

In order to solve the technical problem, the core panel of the invention according to claim 1,
A plurality of equilateral triangle side walls, an equilateral triangle or a square bottom face to which one side of the equilateral triangle of each side wall is connected, and a side of the equilateral triangle not connected to the bottom face is a bottom base And a flange portion formed in the shape of an isosceles trapezoid and projecting outward, and an angle formed between the leg side of the isosceles trapezoid and the lower base in the developed view of the polyhedron Is a right angle triangle in which the hypothetical line connecting the center of gravity of the bottom surface portion and the apex of the regular triangle of the side wall portion is a hypotenuse, the leg side is one side, and the apex on the upper base side of the leg side is a right angle The polyhedron having the flange portion in which the length of the leg side is set to be, and
In a state where the bottom surface portion of the polyhedron is plane-filled, a plate body that supports the plurality of polyhedrons, a pair of plate bodies arranged to face each other,
It is provided with.

In order to solve the technical problem, the core panel of the invention according to claim 2 is:
A plurality of isosceles trapezoidal side walls from which the top of the equilateral triangle is removed, a first flange part of an equilateral triangle formed by the top part from which the side walls are removed, and the leg of the side wall And a second flange portion formed in an isosceles trapezoidal shape having a lower base as a trapezoidal shape and projecting outward, wherein the plurality of side walls in the developed view of the polyhedron The equilateral triangle shares one vertex, the angle formed between the leg side of the flange part and the lower base is 45 °, and the length of one side of the equilateral triangle of the side wall part is a. A first mounting portion formed on the first flange portion at a position of radius 0.17a centered on the apex, and an arc of radius a centered on the shared apex And a second mounting portion formed on the second flange portion. And the facepiece,
A pair of plates arranged opposite to each other;
With
The polyhedron is joined to one plate by the first attachment portion, and the polyhedron is joined to the other plate by the second attachment portion.

In order to solve the technical problem, the cushioning material of the invention according to claim 3 is:
A plurality of equilateral triangle side walls, an equilateral triangle or a square bottom face to which one side of the equilateral triangle of each side wall is connected, and a side of the equilateral triangle not connected to the bottom face is a bottom base And a flange portion formed in the shape of an isosceles trapezoid and projecting outward, and an angle formed between the leg side of the isosceles trapezoid and the lower base in the developed view of the polyhedron Is a right angle triangle in which the hypothetical line connecting the center of gravity of the bottom surface portion and the apex of the regular triangle of the side wall portion is a hypotenuse, the leg side is one side, and the apex on the upper base side of the leg side is a right angle The polyhedron having the flange portion in which the length of the leg side is set to be, and
In a state where a plurality of bottom surfaces of the polyhedron face the outside, a cylindrical body that holds the bottom surface,
It is provided with.

According to invention of Claim 1, 2, the panel which consists of a core which has a flange part of a suitable magnitude | size can be provided, and the core panel which is lightweight, is highly rigid, and has little waste of material can be provided. .
According to the third aspect of the present invention, it is possible to provide a cushioning material including a core having a flange portion of an appropriate size, and to provide a cushioning material that is lightweight, has high rigidity, and has little material waste. .

FIG. 1 is an explanatory diagram of a core panel according to a first embodiment of the present invention. 2 is an exploded view of the core panel of FIG. 1, FIG. 2A is an explanatory view of the upper panel, and FIG. 2B is an explanatory view of the lower panel. 3 is an explanatory view of a quadrangular pyramid core (regular octahedron half core) constituting the core panel of FIG. 1, FIG. 3A is a perspective view, and FIG. 3B is a development view. 4 is an explanatory view of a regular triangular pyramid (regular tetrahedron) core constituting the core panel of FIG. 1, FIG. 4A is a perspective view, and FIG. 4B is a developed view. FIG. 5 is an explanatory diagram of the positional relationship between the quadrangular pyramid core and the regular tetrahedral core supported by the lower board. FIG. 6 is an explanatory diagram of a method for designing the flange of the quadrangular pyramid core according to the first embodiment. FIG. 7 is an explanatory diagram when the shape of the flange of the quadrangular pyramid core of Example 1 is changed, FIG. 7A is an explanatory diagram of a comparative example when the length of the flange is short, and FIG. An explanatory view of a pyramid core, FIG. 7C is an explanatory view of a comparative example when the length of the flange is long. FIG. 8 is an explanatory diagram of a comparative example in which the shape of the flange of the quadrangular pyramid core of Example 1 is changed. FIG. 9 is an explanatory diagram of a method for designing the flange of the triangular pyramid core according to the first embodiment. 10A and 10B are explanatory views of the core panel of Example 2, in which FIG. 10A is a perspective view, FIG. 10B is a view seen from the direction of arrow XB in FIG. 10A, and FIG. FIG. 11 is an explanatory diagram of the core with the upper board removed from FIG. FIG. 12 is a development view of the core of the second embodiment. FIG. 13 is an explanatory diagram of a hole interval of the perforated board according to the second embodiment. FIG. 14 is an explanatory diagram of the positions of holes on the perforated board to which the core of Example 2 is attached. FIG. 15 is an explanatory diagram of the cushioning material of the third embodiment. 16 is an exploded view of the cushioning material of FIG. FIG. 17 is a view of the cushioning material of FIG. 15 as viewed from above. FIG. 18 is an explanatory diagram when eggs are accommodated in the cushioning material of the third embodiment. FIG. 19 is an explanatory view of a development view of another form of the cylindrical body.

Next, examples which are specific examples of embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.
In the following description using the drawings, illustrations other than members necessary for the description are omitted as appropriate for easy understanding.

FIG. 1 is an explanatory diagram of a core panel according to a first embodiment of the present invention.
2 is an exploded view of the core panel of FIG. 1, FIG. 2A is an explanatory view of the upper panel, and FIG. 2B is an explanatory view of the lower panel.
In FIG. 1, a core panel 1 according to the first embodiment of the present invention includes a pair of upper and lower boards 2 and 3 as an example of a plate body. A core 4 is disposed between the boards 2 and 3.

3 is an explanatory view of a quadrangular pyramid core (regular octahedron half core) constituting the core panel of FIG. 1, FIG. 3A is a perspective view, and FIG. 3B is a development view.
In FIG. 2, a quadrangular pyramid core 11 as an example of a polyhedron is supported on the upper board 2. In FIG. 3, the quadrangular pyramid core 11 according to the first embodiment is formed by forming a square bottom surface portion 12, a triangular side wall portion 13 having each side of the bottom surface portion 12 as a base, and projecting outward from the side wall portion 13. Flanged portion 14. In addition, since the quadrangular pyramid core 11 corresponds to a shape obtained by cutting a regular octahedron in half, the quadrangular pyramid may be referred to as a “regular octahedral half” in the present specification and drawings.

In FIG. 3B, the flange portion 14 is formed in an isosceles trapezoidal shape with the bottom of the equilateral triangle side of the side wall portion 13 that is not connected to the bottom surface portion 12. The quadrangular pyramid core 11 of Example 1 is cut out along the development shown in FIG. 3B, and the boundary line (folded line) between the bottom surface part 12 and the side wall part 13 or the boundary line between the side wall part 13 and the flange part 14 ( It can be created by folding along a fold line. In addition, it is possible to hold | maintain the shape of the quadrangular pyramid core 11 even if it does not use an adhesive agent by bending the flange part 14 and making it contact the adjacent side wall part 13. FIG.
In FIG. 2, a total of 36 pieces in 6 rows and 6 columns are arranged on the upper board 2 of the first embodiment in a state where the bottom surface portion 12 of the quadrangular pyramid core 11 is plane-filled. The bottom surface portion 12 and the upper board 2 are joined by a joining member such as an adhesive or a double-sided tape.

  In FIG. 2, the lower board 3 supports a quadrangular pyramid core 11 and a regular triangular pyramid core 21 as an example of a polyhedron. The equilateral triangular pyramid core 21 of the first embodiment is formed by forming an equilateral triangular bottom surface portion 22, an equilateral triangular side wall portion 23 having each side of the bottom surface portion 22 as a base, and projecting outward from the sidewall portion 23. And a flange portion 24. Since the regular triangular pyramid core 21 corresponds to a regular tetrahedron shape, the regular triangular pyramid may be referred to as a regular tetrahedron in the present specification and drawings.

4 is an explanatory view of a regular triangular pyramid (regular tetrahedron) core constituting the core panel of FIG. 1, FIG. 4A is a perspective view, and FIG. 4B is a developed view.
In FIG. 4B, the flange portion 24 is formed in an isosceles trapezoidal shape with the bottom of the equilateral triangle side of the side wall portion 23 that is not connected to the bottom surface portion 22, similarly to the flange portion 14 of the quadrangular pyramid core 11. Yes. Like the regular quadrangular pyramid core 11, the regular triangular pyramid core 21 of the first embodiment can be created by cutting out along the development view shown in FIG. 4B and bending it at the boundary line (fold line) without using an adhesive. However, the shape can be maintained.

FIG. 5 is an explanatory diagram of the positional relationship between the quadrangular pyramid core and the regular tetrahedral core supported by the lower board.
2B and 5, a total of 49 quadrangular pyramid cores 11 in 7 rows and 7 columns are arranged on the lower board 3 of Embodiment 1 in a state where the bottom surface portion 12 is planarly filled. And the tetrahedral core 21 is accommodated in the horizontal direction and the vertical direction between the quadrangular pyramid cores 11. Therefore, as shown in FIG. 2B, the recess surrounded by the regular tetrahedral core 21 has a regular quadrangular pyramid shape, and the regular quadrangular pyramid core 11 supported by the upper board 2 is configured to fit. In the configuration of the first embodiment, the total number of regular tetrahedral cores 21 is 84.
The quadrangular pyramid core 11 and the regular triangular pyramid core 21 constitute the core 4 of the first embodiment.

(Description of flange design method)
(Flange design method for quadrangular pyramid core)
FIG. 6 is an explanatory diagram of a method for designing the flange of the quadrangular pyramid core according to the first embodiment.
In FIG. 6, each point is shaken from A to H. Let a be the length of one side of the equilateral triangle of the side wall 13. The angle (flange angle) formed between the leg side AD of the isosceles trapezoid and the lower base DH is 45 degrees. When the height of the flange (the height of the upper base and the lower base) is h and the length of the flange tip (the length of the upper base) is f, the following formula (1) is established.
f = a-2h Formula (1)
Further, the length of the flange hypotenuse (leg side AD) is h × 2 ^1/2 .
The length of the side CD between the center of gravity C of the bottom surface portion 12 and the vertex D of the equilateral triangle is a × (3 ^1/2 /2+1/2)=1.366a.

If the triangle DAC is a right triangle, the angle FAE is 45 degrees and the angle GAB is 15 degrees. Therefore, the angle CAB is 60 degrees and the angle ACB is 30 degrees. Since the angle DCB is 45 degrees, the angle DCA is 15 degrees.
Therefore, the length AD is expressed by the following formula (2).
(Length AD) = (Length CD) × sin (15 °) = 1.366 × 0.2586 × a
= 0.3532a Formula (2)
Further, the height of the flange is represented by the following expression (3) from h × 2 ^1/2 = 0.3532a.
h = 0.250a Formula (3)

FIG. 7 is an explanatory diagram when the shape of the flange of the quadrangular pyramid core of Example 1 is changed, FIG. 7A is an explanatory diagram of a comparative example when the length of the flange is short, and FIG. An explanatory view of a pyramid core, FIG. 7C is an explanatory view of a comparative example when the length of the flange is long.
As shown in FIG. 7A, in the case of the configuration in which the flange length h is short (h = 0.1a), the width of the flange is not sufficient, which is structurally weak. That is, when a load from the apex of the quadrangular pyramid toward the bottom surface portion 12 is applied, the flange portion 14 surrounding the side wall portion 13 is easily detached, and the quadrangular pyramid core is easily broken.

In FIG. 7C, when the length h of the flange is long (h = 0.3a), there is a problem that it is difficult to make at the time of assembly and the material is wasted. That is, when the flange is long, it is more likely to be caught (interfered with) the side wall portion 13 than when the flange is short, and difficult to make during assembly.
On the other hand, in the configuration shown in FIG. 7B, the quadrangular pyramid core is solid even without an adhesive, there is no problem in assembling property, and no waste of material occurs.

FIG. 8 is an explanatory diagram of a comparative example in which the shape of the flange of the quadrangular pyramid core of Example 1 is changed.
In the configuration in which the flange angle (angle ADH) is 60 ° in FIG. 8, the flange portion 14 sometimes protrudes from the ridge line of the side wall portion 13 due to an error at the time of cutting out from the developed view or an error at the time of bending. That is, it is difficult to create the quadrangular pyramid core 11, and when the upper board 2 and the lower board 3 are fitted together, there is a possibility that the protruding portion is caught and cannot be fitted. Accordingly, it is desirable that the flange angle be less than the regular triangle angle (60 °) of the side wall portion 13.

(Flange design method for triangular pyramid core)
FIG. 9 is an explanatory diagram of a method for designing the flange of the triangular pyramid core according to the first embodiment.
In FIG. 9, each point is shaken from A to E. Let a be the length of one side of the equilateral triangle of the side wall 13. The angle (flange angle) formed between the leg side AD of the isosceles trapezoid and the lower base DE is 45 degrees. When the height of the flange (the height of the upper base and the lower base) is h, the length of the flange hypotenuse (leg side AD) is h × 2 ^1/2 .
Since the triangle CDE is a right triangle with an angle CED of 90 ° and the angle DCE is 60 °, the length of the side CD between the center of gravity C of the bottom surface portion 12 and the vertex D of the equilateral triangle is a × (2 / (3 ^1/2 )) = 1.154a.

Here, if the triangle DAC is a right triangle, the angle CDA is 75 degrees and the angle DCA is 15 degrees.
Therefore, the length AD is expressed by the following formula (4).
(Length AD) = (Length CD) × sin (15 °) = 1.154 × 0.2586 × a
= 0.2987a Formula (4)
Further, the height of the flange is represented by the following formula (5) from h × 2 ^1/2 = 0.2987a.
h = 0.221a Formula (5)
Therefore, by forming the flange portion 24 with h = 0.221a, it is possible to produce a regular triangular pyramid core 21 that is firm, has no problem in assembling, and has little waste of material even without an adhesive.

(Operation of Example 1)
The core panel 1 according to the first embodiment having the above-described configuration can be created by creating the cores 11 and 21 and arranging them side by side on the boards 2 and 3 and stacking the boards 2 and 3 so as to fit each other. The produced core panel 1 has a shape in which a regular tetrahedron and a regular octahedron half core are filled with a space, and forms a so-called octet truss structure. Moreover, in Example 1, since each core 11 and 21 is a hollow polyhedron, the core panel 1 is also reduced in weight. Therefore, it is possible to provide a core panel 1 that is lightweight, rigid and rigid.

  In particular, in the first embodiment, the cores 11 and 21 can be assembled without using an adhesive by appropriately setting the flange portions 14 and 24, and the boards 2 and 3 are fitted together. Thus, no adhesive is required when overlapping. Therefore, the manufacturing cost can be reduced as compared with the prior art that requires adhesive, welding, riveting and the like.

  Further, instead of the boards 2 and 3, a box such as a cardboard box can be used. In this case, the cores 11 and 21 arranged on the lower board 3 are arranged on the bottom surface of the box, and the quadrangular pyramid cores 11 arranged on the upper board 2 are arranged on the bottom board to cover the box, thereby creating a core panel. Is possible. When the box lid is closed, the cores 11 and 21 are pressed by the bottom and the lid on the top and bottom, and the sides are also immovable on the side wall of the box. Therefore, the core panel loses rigidity when the core moves in the board surface direction with respect to the board, but the cores 11 and 21 cannot move in the surface direction with respect to the bottom surface in the configuration housed in the box. Therefore, the cores 11 and 21 can be rigid with respect to the box simply by housing them side by side and covering them without using an adhesive. That is, it is possible to realize a core panel that does not use any adhesive.

  For example, if the core filling rate is 100% in a closed container space with a corrugated cardboard core, the adjacent core group presses the surface to form a strong structure without adhesive. Has also been verified. On the other hand, a commercially available honeycomb panel has a structure in which a large number of regular hexagonal pillars are fitted between upper and lower panels. However, if these adhesives are not used, loads will be applied from various directions and the effect of the adhesive will be lost. When the temperature rises to a certain temperature range, the pillars become stiff and structurally collapse. Also, honeycomb panels that use adhesives can no longer be repaired if a defect occurs.

  In this regard, in Example 1, such a defect does not occur even without an adhesive, but an adhesive can also be used. Of course, if a large amount of adhesive is used, the structure is further strengthened. The proper use of both is to select the structural strength according to the application, and if no adhesive is used, even if worn out, the container is opened and the core is refolded, or some cores are replaced with new cores. There is a great advantage that it can be reused as many times as possible. When an adhesive is used, if a defect occurs, it becomes difficult to reuse as in the honeycomb panel.

Therefore, in Example 1, the configuration in which no adhesive is used can be used even in a high-temperature environment where the adhesive is dissolved. Therefore, it can be used even in an environment that cannot be used with a panel using a conventional adhesive.
Further, in a configuration in which no adhesive is used, the core panel 1 can be quickly assembled by simply disassembling and cleaning the cores 11 and 21 and storing the cores 11 and 21 in the box at the time of use. Is possible. And after use, it can be disassembled again and stored, and space is also saved during storage.

  Moreover, it is possible to make a panel of arbitrary thickness, height, and width by stacking the panels containing the cores 11 and 21 in the box in the thickness direction or arranging them in the surface direction. The cores 11 and 21 can be made of any material such as paper, cardboard, cloth, resin, metal, and the boards 2, 3 and the box can be made of any material. Therefore, it can be used as a lightweight bed or cushion, used as a cushioning material for protecting merchandise, used as a flooring or wall material for buildings, as a substitute for tatami mats, and the like.

Next, a second embodiment of the present invention will be described. In the description of the second embodiment, components corresponding to the components of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. To do.
This embodiment is different from the first embodiment in the following points, but is configured in the same manner as the first embodiment in other points.
10A and 10B are explanatory views of the core panel of Example 2, in which FIG. 10A is a perspective view, FIG. 10B is a view seen from the direction of arrow XB in FIG. 10A, and FIG. 10C is a view seen from the direction of arrow XC in FIG.
FIG. 11 is an explanatory diagram of the core with the upper board removed from FIG.
FIG. 12 is a development view of the core of the second embodiment.

  10 and 11, the panel 51 of the second embodiment includes a pair of upper and lower perforated boards 52 and 53 as an example of a plate body. The perforated boards 52 and 53 according to the second embodiment are configured by perforated boards in which a plurality of holes are formed in the plate at predetermined intervals. A commercially available so-called punching metal can be used for the perforated board. As an example, a punching metal of Φ5 × P8, that is, a punching metal having a hole diameter Φ of 5 mm and a pitch (hole interval) P of 8 mm can be used.

  In FIG. 11, in the panel 51 of Example 2, a quadrangular pyramid core 61 as an example of a polyhedron is supported. 11 and 12, the quadrangular pyramid core 61 of the second embodiment differs from the quadrangular pyramid core 11 of the first embodiment in that it does not have the bottom surface portion 12 but has four side wall portions 63. The side wall 63 of the second embodiment is formed in an isosceles trapezoidal shape from which the apex of the regular triangle is removed. Further, an equilateral triangular first flange portion 64 is formed at the top portion of the side wall portion 63 removed. A second flange portion 65 is formed on the side wall portion 63 so as to project outward. The second flange portion 65 is formed in an isosceles trapezoidal shape having the lower base 63a of the isosceles trapezoid as a lower base. Further, the side wall 63 is provided with a third flange portion 66 for joining the ends 63b and 63c of the side wall 63 in the development view.

The first flange portion 64 is formed with a first attachment hole 64a as an example of a first attachment portion corresponding to the holes of the perforated boards 52 and 53. In the second embodiment, one first mounting hole 64 a is formed in each of the first flange portions 64.
The second flange portion 65 is also provided with a second attachment hole 65a as an example of the second attachment portion corresponding to the holes of the perforated boards 52 and 53. In the second embodiment, two second mounting holes 65 a are formed in each second flange portion 65.
Further, the third flange portion 66 is also formed with a third attachment hole 66a as an example of the third attachment portion. In the second embodiment, two are formed along the end 63 b of the side wall 63. A joint hole 63d is also formed at the end 63c of the side wall 63 to which the third flange 66 is connected, corresponding to the third mounting hole 66a.

  Therefore, in the quadrangular pyramid core 61 of the second embodiment, the third mounting hole 66a and the joining hole 63d are fixed with rivets. Then, in a state in which the flange portions 64 and 65 are bent outward, bolts and nuts that pass through the first mounting holes 64a of the first flange portion 64 and the holes of the upper perforated board 52 are square pyramids. The upper part (top part) of the core 61 and the upper perforated board 52 are joined. Further, the lower part (bottom part) of the quadrangular pyramid core 61 and the lower board 53 are joined by bolts and nuts that pass through the second mounting hole 65 a of the second flange part 65 and the hole of the lower board 53. . In this way, the panel 51 shown in FIGS. 10 and 11 is created.

(Description of the flange designing method of Example 2)
In FIG. 11, in the quadrangular pyramid core 61 of the second embodiment, when the length of one side of the regular triangle of the side wall portion 63 is a (for example, a = 65.5 mm), the first design method of the first embodiment is used. The flange width h1 of the flange portion 64 and the flange width h2 of the second flange portion 65 are both h1 = h2 = 0.25a. That is, in the same manner as the relationship between the width dimension of the second flange portion 65 on the core bottom surface side and the flange hole (second mounting hole 65a) dimension (same as the hole dimension of the perforated panel), The width dimension and the hole (first mounting hole 64a) dimension of the flange portion 64 are also designed. If the flange width dimension is 0.25a, four first flange portions 64 having a regular triangle shape with a height of 0.25a from the apex are designed. Further, assuming that the position of the center of gravity of the regular triangle is stable when receiving a load, the position of the flange hole (first mounting hole 64a) is four on a circle having a radius of 0.17a from the apex. The flange hole (first mounting hole 64a) is designed.

FIG. 13 is an explanatory diagram of a hole interval of the perforated board according to the second embodiment.
In FIG. 13, in the perforated boards 52 and 53 of the second embodiment, the holes are regularly arranged at a φ5 mm pitch of 8 mm. Here, the holes are not arranged in a lattice pattern, and six holes are arranged around one hole with an interval of 8 mm. Accordingly, the holes are formed in the perforated boards 52 and 53 at intervals of 8 mm in the horizontal direction in FIG. 13 but at intervals of 14 mm in the vertical direction.
Therefore, on the first flange portion 64 side, the positions of the flange holes (first mounting holes 64a) are 32 mm apart (three jumps) in the horizontal direction and 28 mm apart (one jump) in the vertical direction. . Therefore, the average is 30 mm. If a bolt with a diameter of 4 mm is used with respect to the hole diameter of the perforated boards 52 and 53 and the hole diameter of the first mounting hole 64a, the bolt can be attached within a radius error of 1 mm.

  Moreover, if the hole interval of the two holes (second attachment hole 65a) in the bottom side flange (second flange portion 65) is attached to one jump hole, it is 16 mm or 28 mm, There are eight holes (second mounting holes 65a). The positions of the second mounting holes 65a with a spacing of 16 mm and the positions of the second mounting holes 65a ′ with a spacing of 28 mm appear alternately in the developed view, and in the state of becoming the quadrangular pyramid core 61, the side wall portions facing each other. 63 will be provided.

In FIG. 11, in Example 2, these eight holes are designed on a circle approximately centered on the vertex A. When the perpendicular AD is drawn on the straight line BC connecting the centers B and C of the two hole positions on the flange from the vertex A, the length becomes 0.866a + 0.125a = 0.919a. When the interval between the two holes is 16 mm, the length from the center position D of the two hole positions to the center E of the one hole (first mounting hole 64a) is 0.125a. Therefore, the length from the vertex A to the flange hole (second mounting hole 65a) center position B, C = SQRT (0.991 ² +0.125 ² ) * a = 0.999a.

When the distance between the two holes (second mounting hole 65a) is 28 mm, the length from the center position D of the two hole positions B and C to the one hole center E is 0.21875a. Therefore, the length from the vertex A to the center position of the flange hole (second mounting hole 65a) = SQRT (0.991 ² +0.21875 ² ) * a = 1.015a. Approximately the average of both cases, eight flange hole positions are designed on a circle with a radius of 1.007a. Considering the bending accuracy with respect to the length a, the difference of 7/1000 can be neglected and can be practically designed on a circle with the radius a. As described above, although it is difficult to design the flange hole position so as to correspond to the hole position of the perforated panel, the present invention has an effect that the flange hole and the hole position can be designed clearly and easily.
Note that the length a can be dealt with by changing according to the position (hole interval) of the holes of the perforated boards 52 and 53 to be used.

FIG. 14 is an explanatory diagram of the positions of holes on the perforated board to which the core of Example 2 is attached.
In the design method of the second embodiment, as an example, a configuration in which a = 65.5 mm and a commercially available Φ5 × P8 punched metal perforated board 52, 53 will be described. In FIG. 14, a point corresponding to the apex of the quadrangular pyramid core 61 is A1. Assuming that the hole to which the second mounting holes 65a with a spacing of 16 mm are attached is A2, the length of the straight line A1A2 is SQRT (42 ² +8 ² ) = 42.7 mm from FIG. Further, assuming that the hole to which the second attachment holes 65a ′ with a spacing of 28 mm are attached is A3, the length of the straight line A1A3 is SQRT (40 ² +14 ² ) = 42.3 mm from FIG. As described above, when the holes are mounted on the perforated boards 52 and 53 at the eight positions of the second mounting holes 65a and 65a ′ on the bottom side of the quadrangular pyramid core 61, they are installed on the circumference having an average radius of 42.5 mm. It becomes. Accordingly, the positions A2 and A3 of the holes are very small with a deviation of ± 0.2 mm from the average radius, and the square pyramid core 61 having a regular quadrangular pyramid shape is installed by effectively using the commercially available perforated boards 52 and 53. Is possible.

  Therefore, in Example 2, the flange shape dimensions are designed using the geometrical characteristics of the equilateral triangular side wall 63 constituting the quadrangular pyramid core 61 and the plane corresponding to the bottom surface of the quadrangular pyramid core 61. The mounting holes 64a and 65a are dimensioned and positioned by utilizing the holes of the commercially available perforated boards 52 and 53. All of the holes of the perforated boards 52 and 53 may be used, or only some necessary holes can be selected by requesting the manufacturer.

(Operation of Example 2)
In the panel 51 of the second embodiment having the above configuration, the panel 51 can be assembled by attaching the quadrangular pyramid core 61 to the perforated boards 52 and 53 without using any adhesive. In particular, in the second embodiment, as in the first embodiment, since the flange portions 64 and 65 are appropriately set, when the flange portions 64 and 65 are fixed to the perforated boards 52 and 53, the length of the flange portions 64 and 65 is increased. It is possible to prevent the material from being wasted due to insufficient length and insufficient fixing, or the length of the flange portions 64 and 65 being excessive.
That is, if the width of the flange portions 64 and 65 is too long, the material is wasted and becomes heavy, and there is a loss that blocks holes necessary for the sound insulation effect (holes of the perforated board). Moreover, if the width of the flange portions 64 and 65 is too short, the positions where the attachment holes 64a and 65a are formed are limited, and it becomes difficult to form the holes corresponding to the positions of the perforated boards 52 and 53. There is a possibility that the quadrangular pyramid core 61 cannot be joined to the perforated boards 52 and 53 by aligning the positions of the holes. In the second embodiment, these problems can be solved.

In particular, the perforated boards 52 and 53 have a plurality of holes, and the plurality of holes penetrate the interior space of the quadrangular pyramid core 61 when viewed from the lower board 53 side. The punching metal (perforated board) 52, 53 is originally known to have a soundproofing effect (sound absorption, sound insulation), and the sound that has passed through the hole in the punching metal with the quadrangular pyramid core 61 joined thereto. Is attenuated by the wall surface of the quadrangular pyramid core 61 and the like, it can be expected to provide a panel 51 having a higher soundproofing effect (sound absorption and sound insulation). Therefore, it is expected to be used for a soundproof wall for home use, a soundproof floor, a soundproof wall for an expressway, and the like.
Furthermore, for example, by preparing three or more perforated boards and installing a quadrangular pyramid core 61 between them, it is possible to construct a multi-layer panel, and it is expected to improve the soundproofing effect and the like. Is done.

Further, the perforated board can be fixed with bolts and nuts by overlapping a part of the holes between the end portions in the plane direction, and it is easy to create the panel 51 having a large area.
Furthermore, in the second embodiment, the configuration in which the bottom of the quadrangular pyramid core 61 is fixed to the lower board 53 and the top of the quadrangular pyramid core 61 is fixed to the upper perforated board 52 is exemplified. It is also possible to increase the installation density of the quadrangular pyramid cores 61 by alternately disposing (the top and the bottom) in reverse. Increasing the density of the quadrangular pyramid core 61 is expected to improve rigidity.

Next, a third embodiment of the present invention will be described. In the description of the third embodiment, the same reference numerals are given to the components corresponding to the components of the first embodiment, and the detailed description thereof will be omitted. To do.
This embodiment is different from the first embodiment in the following points, but is configured in the same manner as the first embodiment in other points.

FIG. 15 is an explanatory diagram of the cushioning material of the third embodiment.
16 is an exploded view of the cushioning material of FIG.
FIG. 17 is a view of the cushioning material of FIG. 15 as viewed from above.
15 and 16, in the cushioning material 80 of the third embodiment, five five pyramid (regular octahedron half) cores 11 are arranged side by side in the circumferential direction. The quadrangular pyramid (regular octahedron half) core 11 is installed so that the bottom surface portion 12 is an outer surface along the vertical direction, and the apex of the quadrangular pyramid core 11 (the point where the corners of the side wall portion 13 concentrate) is the center. In addition, the side wall 13 of the quadrangular pyramid core 11 is an equilateral triangle and each angle is 60 degrees. However, when arranged as shown in FIGS. 15 and 16, the angle seen from above as shown in FIG. 17. (Opening angle) θ is θ = 70.6 degrees. If only five geometrical pyramid cores 11 are arranged by geometric angle calculation without considering the plate thickness, 70.6 degrees × 5 = 353 degrees, which is insufficient by 7 degrees (= 360-353).

Here, when the length of one side of the regular octahedral half core in FIG. 17 is a, the radius is expressed by the following formula (6).
r = 0.5a / sin (70.6 ° / 2) = 0.866a (6)
Therefore, the circumference of a circle circumscribing the five quadrangular pyramid cores 11 (pentagon when viewed from above) is 2 × π × 0.866a = 5.44a.
Further, when the thickness of the quadrangular pyramid core 11 is t, since there are side surfaces and flange surfaces on both sides of the triangle constituting the pentagon, a total thickness of 4t is added. The total thickness of the five triangles is 20t. Therefore, the angle α according to the plate thickness is 360 × (20 t / 5.44a).
As an example, when a = 100 mm and t = 0.5 mm, α = 6.6 °.
When a = 65 mm and t = 0.3 mm, α = 6.1 °.
Therefore, considering the plate thickness t, when α = 6.6 °, 353 ° + 6.6 ° = 359.6 ° ≈360 °. In consideration of errors such as significant figures, manufacturing errors, and the like, the cushioning material 80 of the third embodiment may realize space filling (planar filling when viewed from above) including the plate thickness t. Alternatively, the plate thickness t can be adjusted to be exactly 360 °.

15 and 16, the five quadrangular pyramid cores 11 are accommodated in a pentagonal cylindrical outer case 81 as an example of a cylindrical body. That is, the bottom surface portions 12 of the five quadrangular pyramid cores 11 are accommodated so as to face and contact the inner surface of the outer case 81. Therefore, the five quadrangular pyramid cores 11 are not separated from each other in the state of being accommodated in the outer case 81, and can be easily carried.
Further, a top cover 82 and a bottom cover 83, which are pentagonal plates, are supported on the top and bottom of the outer case 81. When the quadrangular pyramid core 11 is taken in and out of the outer case 81, it is attached or detached. Is possible.

  In the third embodiment, the object to be buffered is accommodated in each quadrangular pyramid core 11, so that the object to be buffered can be transported and stored while being protected by the quadrangular pyramid core 11. The buffered object can be any object such as snacks such as sweets and beans, pickles subdivided into sealed bags, preserved foods, liquids, and the like. It is also possible to use each of the quadrangular pyramid cores 11 taken out after being transported and sold by the cushioning material 80 as a small container.

FIG. 18 is an explanatory diagram when eggs are accommodated in the cushioning material of the third embodiment.
In addition, as shown in FIG. 18, an egg 84 can be housed inside. However, when the egg 84 is accommodated, the egg 84 may move within the quadrangular pyramid core 11 and collide with the side wall portion 13 or the like when being transported by the cushioning material 80, so as shown in FIG. It is possible to protect the egg 84 by winding the egg 84 with a cylindrical film (movement preventing material) 86 so that the egg 84 does not move in the quadrangular pyramid core 11.
In addition, when the experiment was made to drop the cushioning material 80 from a height of 1 m in a state in which the eggs 84 were wound around the respective quadrangular pyramid cores 11, the five eggs 84 were not cracked or cracked. confirmed.

FIG. 19 is an explanatory view of a development view of another form of the cylindrical body.
The upper lid 82 and the bottom lid 83 can be formed to be openable and closable so as to share one side of the pentagon with the outer case 81, or can be formed to be unopenable and closable by supplying two or more sides. Further, even when opening and closing is not possible, it is preferable to form a cut line or fold line so that it can be folded. As shown in FIG. 19, the upper lid 82 can be opened and closed by sharing one side with the outer case 81, and the bottom lid 83 is composed of three pieces 83-1 to 83-3, so-called double-opening configuration. It is also possible.
Similarly to the first embodiment, one regular triangular pyramid (tetrahedron) core 21 is arranged below one of the five quadrangular pyramid cores 11 (one layer of quadrangular pyramid cores 11). It is also possible to laminate the core 11 layer, the regular triangular pyramid core 21 layer, the quadrangular pyramid core 11 layer, and so on. In this case, the multi-layer cores 11 and 21 can be accommodated by extending the length of the outer case 81 in the vertical direction.

Even if the next quadrangular pyramid core 11 is accommodated under the quadrangular pyramid core 11 layer without providing the regular triangular pyramid core 21 layer, the outer periphery is held by the outer case 81, and the quadrangular pyramid cores 11 are not connected. Since the shape is maintained and balanced by the contact between the quadrangular pyramid core 11 and the outer case 81, it is formed as a cushioning material. That is, the situation where the three-dimensional space is filled with the quadrangular pyramid core 11 and the triangular pyramid-shaped space, that is, the quadrangular pyramid and the triangular pyramid does not change (space filling is established). In addition, the layer of the regular triangular pyramid core 21 may be configured not to provide all, but to arrange the regular triangular pyramidal core 21 in a part of the space and not arrange the regular triangular pyramidal core 21 in the remaining space. Is possible. That is, in the shock absorbing material 80 of Example 3, even if some cores 11 and 21 are missing, it can be established as a structure. Similarly, in the core panel of the first embodiment, even if some of the cores 11 and 21 are omitted, the structure is established. And it is also possible to accommodate the buffer object in the space where the cores 11 and 21 are missing.
In addition, the space filling rate in the cushioning material of Example 3,
Space filling factor = (volume of each core 11 and 21 (considering plate thickness t))
× (Sum of several cores 11 and 21)
/ (Inner volume of outer case 81)
If there is no omission, it will be 100%, and if there are omissions in the cores 11 and 21, the space filling rate will be lowered accordingly. The space filling rate can be changed on a case-by-case basis according to the design, specifications, etc., such as the shape and size of the buffer object and how much buffering is required.

Moreover, in Example 3, although the structure which utilizes the pentagonal cylindrical outer case 81 was illustrated, it is not limited to this. Any configuration that can hold the five cores 11 and 21 so as not to fall apart can be adopted. For example, it is possible to hold the outer circumference with a material such as rubber, string, or band.
Furthermore, in Example 3, the quadrangular pyramid core 11 and the outer case 81 are made of a translucent resin. Therefore, it is also possible to easily check the state of the buffered object from the outside. The quadrangular pyramid core 11 and the outer case 81 are not limited to being made of a translucent material, but can be made of an opaque (colored) material or a transparent material. Further, the material of the outer case 81 is not limited to resin, and can be composed of paper such as cardboard.
Moreover, in Example 3, it comprises the pentagonal cylindrical (pentagonal column-shaped) shock absorbing material 80, and it becomes advantageous at the point of an installation area compared with a panel type shock absorbing material.

(Example of change)
As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, A various change is performed within the range of the summary of this invention described in the claim. It is possible.
For example, the specific numerical values exemplified in the embodiments such as the hole diameter of the perforated board can be appropriately changed.

Moreover, in Example 2, although the structure which uses a punching metal was illustrated, it is not limited to this. It is also possible to use a board in which a hole is formed only at a position where the quadrangular pyramid core 61 is attached. Further, as illustrated in Example 1, it is also possible to use a box-shaped member having a side surface in addition to the bottom surface and the lid (top surface).
Further, in the second embodiment, the third flange portion 66 may be configured not to be provided when joined by another method such as welding or adhesive.

  Further, in Example 2, there are various types of commercially available perforated panel materials, plate thicknesses, hole dimensions, positions, hole numbers, and the like. Selection is possible according to the application. All the holes may be used, or only a part of the necessary holes may be used and can be selected after consulting with the manufacturer.

1, 51 ... Core panel,
2, 3, 52, 53 ... plate,
11, 21, 61 ... polyhedron,
12 ... bottom part,
13, 23, 63 ... sidewall portions,
14 ... flange part,
64 ... the first flange portion,
64a ... 1st attachment part,
65 ... second flange part,
65a ... 2nd attachment part.

Claims (3)

A plurality of equilateral triangle side walls, an equilateral triangle or a square bottom face to which one side of the equilateral triangle of each side wall is connected, and a side of the equilateral triangle not connected to the bottom face is a bottom base And a flange portion formed in the shape of an isosceles trapezoid and projecting outward, and an angle formed between the leg side of the isosceles trapezoid and the lower base in the developed view of the polyhedron Is a right angle triangle in which the hypothetical line connecting the center of gravity of the bottom surface portion and the apex of the regular triangle of the side wall portion is a hypotenuse, the leg side is one side, and the apex on the upper base side of the leg side is a right angle The polyhedron having the flange portion in which the length of the leg side is set to be, and
In a state where the bottom surface portion of the polyhedron is plane-filled, a plate body that supports the plurality of polyhedrons, a pair of plate bodies arranged to face each other,
A core panel characterized by comprising A plurality of isosceles trapezoidal side walls from which the top of the equilateral triangle is removed, a first flange part of an equilateral triangle formed by the top part from which the side walls are removed, and the leg of the side wall And a second flange portion formed in an isosceles trapezoidal shape having a lower base as a trapezoidal shape and projecting outward, wherein the plurality of side walls in the developed view of the polyhedron The equilateral triangle shares one vertex, the angle formed between the leg side of the flange part and the lower base is 45 °, and the length of one side of the equilateral triangle of the side wall part is a. A first mounting portion formed on the first flange portion at a position of radius 0.17a centered on the apex, and an arc of radius a centered on the shared apex And a second mounting portion formed on the second flange portion. And the facepiece,
A pair of plates arranged opposite to each other;
With
The core panel, wherein the polyhedron is joined to one plate by the first attachment portion, and the polyhedron is joined to the other plate by the second attachment portion. A plurality of equilateral triangle side walls, an equilateral triangle or a square bottom face to which one side of the equilateral triangle of each side wall is connected, and a side of the equilateral triangle not connected to the bottom face is a bottom base And a flange portion formed in the shape of an isosceles trapezoid and projecting outward, and an angle formed between the leg side of the isosceles trapezoid and the lower base in the developed view of the polyhedron Is a right angle triangle in which the hypothetical line connecting the center of gravity of the bottom surface portion and the apex of the regular triangle of the side wall portion is a hypotenuse, the leg side is one side, and the apex on the upper base side of the leg side is a right angle The polyhedron having the flange portion in which the length of the leg side is set to be, and
In a state where a plurality of bottom surfaces of the polyhedron face the outside, a cylindrical body that holds the bottom surface,
A cushioning material characterized by comprising: