JP7536273B2 - Cardboard coffin - Google Patents

Description

The present invention relates to a cardboard coffin.

Traditionally, coffins made from wood such as cypress, fir, or paulownia were the norm, but in recent years, coffins made from cardboard have been proposed.

For example, Patent Documents 1 and 2 disclose a coffin made of cardboard, with the edges of the coffin body or the edges of the coffin lid folded back on the inside of the coffin. When folding the cardboard into the shape of the coffin, a V-shaped groove is provided on the back of the cardboard, and the cardboard is folded using this V-shaped groove.

Patent Document 3 discloses a coffin made of cardboard, with auxiliary panels made of wood material and about 2 to 15 mm thick attached to the inside of the side walls. In this coffin, the auxiliary panels are attached to the bottom, side and ceiling walls of the coffin, which is said to prevent the length and width of the cardboard walls from changing due to the effects of weather and humidity.

JP 2008-22916 A Utility Model Registration No. 3144211 JP 2010-119797 A

In cardboard coffins such as those in Patent Document 1 or Patent Document 2, changes in humidity can cause the cardboard that makes up the coffin to deform, leading to warping of the side walls and lid of the coffin.

In addition, because cardboard looks bad when left exposed, decorative sheets with patterns such as wood grain are sometimes attached to the outside of the cardboard. Decorative sheets are often only attached to the outside surface of the cardboard, and not to the inside surface of the cardboard. Decorative sheets can expand and contract due to changes in temperature or humidity, or the passage of time. If the decorative sheet is only attached to the outside of the cardboard, the rate of expansion and contraction will differ between the inside and outside surfaces of the cardboard, making the cardboard more susceptible to warping.

As in Patent Document 3, attaching a wooden auxiliary plate may be able to prevent the cardboard from warping. However, the additional step of attaching the auxiliary plate to the cardboard complicates the manufacturing process and increases the weight of the coffin.

The present invention aims to provide a cardboard coffin that is simple in structure and prevents the cardboard that makes up the coffin from warping.

A coffin made of cardboard, in which at least one of the side walls and the lid of the coffin body is made of cardboard, the cardboard has a decorative layer arranged on the exterior surface, and the inner surface opposite the exterior surface has linear cuts that are not for bending, and the above-mentioned problems are solved by a cardboard coffin in which the side walls or the lid made of cardboard are prevented from warping by the linear cuts. Since the decorative layer is arranged on the exterior surface of this cardboard coffin, it is possible to make a coffin that does not give the impression of the texture of cardboard. Since the surface opposite the decorative layer has linear cuts, it is possible to prevent the cardboard from warping due to expansion and contraction of the decorative layer or changes in humidity or temperature, and to maintain the appearance of the coffin beautiful. The cardboard warping is prevented by the cuts. Since the structure is simpler than a configuration in which a wooden auxiliary board or the like is attached to prevent warping, its manufacture can also be simplified.

In the above cardboard coffin, the cardboard has a first layer including a first liner and a first corrugated body, a second layer including a second corrugated body, and a partition plate separating the first and second layers, and it is preferable that the cut is deep enough to penetrate the first liner and the first corrugated body but not the partition plate. This prevents the cardboard from warping and prevents the strength of the cardboard, which is the material that makes up the coffin, from decreasing excessively.

In the above cardboard coffin, the linear cut is preferably made vertically on the side wall of the coffin body, with an excess length so that it does not reach the bottom end of the side wall of the coffin body. This prevents the side wall of the coffin from warping and prevents the strength around the bottom of the coffin from decreasing excessively.

In the above-mentioned cardboard coffin, it is preferable that the linear cuts are arranged in both the short and long directions of the lid. This makes it possible to prevent warping of the lid in the long and short directions due to expansion and contraction of the decorative layer or changes in humidity or temperature.

In the above-mentioned cardboard coffin, it is preferable that a reinforcing material is arranged on the inner surface of the lid body to support the weight of the lid. By supporting the weight of the lid with the reinforcing material, it is possible to prevent the lid from bending due to its own weight, rather than due to expansion and contraction of the decorative layer or changes in humidity or temperature.

The present invention provides a cardboard coffin that is simple in structure and prevents warping of the cardboard that makes up the coffin.

FIG. 1 is a perspective view showing one embodiment of a cardboard coffin. FIG. 2 is an enlarged cross-sectional view of the cardboard used in the cardboard coffin of FIG. 1. FIG. 2 is a perspective view showing the coffin body of the cardboard coffin of FIG. 1. FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3 . 2 is a perspective view showing the surface of the cardboard coffin body of FIG. 1. FIG. This is a perspective view showing the back surface of the cardboard coffin body of Figure 1. FIG. 7 is a cross-sectional view taken along the line BB in FIG. 6 . FIG. 7 is a cross-sectional view taken along the line CC in FIG. 6 . FIG. 4 is a perspective view showing the coffin body of FIG. 3 in an exploded state. FIG. 10 is a cross-sectional view of the portion DD in FIG. 9, that is, a vertical cross-sectional view of the second exterior material. FIG. 10 is a perspective view showing a state in which the first interior material shown in FIG. 9 is deployed. 10 is a perspective view showing the first interior material and the second interior material shown in FIG. 9 in an expanded and exploded state. FIG. FIG. 7 is a perspective view showing a state in which the cover shown in FIG. 6 is disassembled. FIG. 14 is a cross-sectional view taken along the line EE in FIG. 13, that is, a vertical cross-sectional view of the fourth exterior material. FIG. 7 is a perspective view showing a state in which the cover shown in FIG. 6 is disassembled. 7 is a perspective view showing a state in which a cover is attached to the lid body shown in FIG. 6. FIG.

Below, one embodiment of a cardboard coffin is described with reference to the drawings.

The cardboard coffin 1 of this embodiment (hereinafter simply referred to as "coffin") is made of cardboard and is composed of a coffin body 11 and a lid 12 as shown in Figure 1. Both the coffin body 11 and the lid 12 of the coffin 1 are made of cardboard. The cardboard that makes up the side walls of the coffin body 11 and the cardboard that makes up the lid 12 have a decorative layer 13 that is placed on the exterior surface of the coffin 1, and the inner surface opposite the exterior surface has linear slits 14 that are not for folding. When we say linear slits, we are including a shape in which the slits are arranged intermittently in a dashed line.

The cardboard constituting the coffin body 11 and the cardboard constituting the lid body 12 both have a first layer 83 including a first liner 81 and a first corrugated body 82, a second layer 86 including a second corrugated body 84 and a second liner 85, and a partition plate 87 separating the first layer 83 and the second layer 86, as shown in FIG. 2. The slits 14 penetrate the first liner 81 and the first corrugated body 82, but are deep enough that the partition plate 87 does not penetrate. The second corrugated body 84 and the second liner 85 are shaped so that the slits 14 do not penetrate, leaving the second layer 86 intact. Leaving the second layer 86 intact improves the strength of the coffin 1. On the other hand, the first layer 83 has slits 14. The slits break up the shrinkage of the cardboard caused by changes in humidity or temperature, and divide it into small areas. This reduces cardboard warping caused by shrinkage due to changes in humidity or temperature, and warping caused by differences in the shrinkage rate between the side with a decorative layer and the side without a decorative layer. This also reduces deformation of the side walls and lid of the coffin 1 caused by cardboard warping.

In the coffin 1 according to the above embodiment, cardboard having a first layer 83 and a second layer 86 is used. For example, a cardboard having a third layer may be used by placing a second partition plate and a third corrugated body between the second corrugated body 84 and the second liner 85. In this way, the cardboard used as a component material for the coffin may be a multi-ply cardboard having two or more layers, or a single-ply cardboard.

The number of linear slits and the direction of the linear slits are not particularly limited, and they may be provided in any number and direction that can prevent the coffin body or the lid from warping. For example, they may be provided in a lattice shape, as with the lid described below. In the coffin 1 of this embodiment, as shown in FIG. 3, for the coffin body 11, multiple slits 14 are provided along the short side (vertical direction) of the coffin on the inner surface (interior surface) opposite the exterior surface of the coffin 1. This is configured to mainly prevent warping in the longitudinal direction of the side wall and to prevent excessive reduction in the strength of the side. The slits 14 are long enough to provide a surplus 141 so as not to reach the bottom end of the side wall. This prevents the strength of the bottom part of the coffin body 11 from being extremely reduced. The load of the body is concentrated on the bottom part of the coffin, so it is necessary to increase the strength. As described above, by providing the surplus 141, it is possible to prevent a reduction in the strength of the bottom part of the coffin body 11. In addition, in the drawings, hidden structures are shown by dashed lines.

In the coffin 1 of this embodiment, as shown in Figures 7 and 8, the lid 12 has multiple slits 14 on the inner surface opposite the exterior surface of the coffin 1, running along both the short and long sides of the coffin, with the long side slits 14 intersecting with the short side slits 14 to form a lattice pattern. This makes it possible to prevent warping of the lid 12 in both the long and short sides. There are no particular limitations on the direction in which the slits 14 are provided and the number of slits 14 provided, and for example, they may be provided in at least one of the long and short sides of the lid 12.

By providing linear cuts 14 on the inside of the lid 12, it is possible to prevent the cardboard from warping due to changes in humidity or temperature, or differences in the shrinkage rate between the side with the decorative layer and the side without the decorative layer. However, depending on the dimensions of the lid, the lid may bend under its own weight. In order to prevent such bending of the lid 12 under its own weight, wooden beams 15 are placed on the inside of the lid as shown in Figures 6 to 8 as reinforcing materials to support the weight of the lid.

As shown in Figures 6 to 8, multiple wooden beams 15 are provided along the short side of the lid 12, and one end and the other end are fixed in contact with the inner surface of the lid. The reinforcing material may be any material capable of supporting the weight of the lid 12 and suppressing bending of the lid due to the weight. Therefore, for example, the beams may be provided along the longitudinal direction of the coffin. Since it does not prevent warping of the lid 12 due to moisture, etc., if the rod-shaped beams 15 as described above are provided at a predetermined interval, the increase in weight of the coffin 1 due to the use of the reinforcing material can be reduced. As a reinforcing material, a wooden or synthetic resin plate may be attached to the back surface of the lid, but from the viewpoint of weight reduction, it is preferable to use the beams described above.

As shown in Figure 8, the beam 15 used in the coffin 1 of this embodiment has one end and the other end cut off on the side where the beam 15 contacts the inner surface of the lid 12, and has a shape with a convex portion 151 in the middle of the beam 15. The middle portion of the lid 12 is prone to bending due to its own weight. For this reason, it is preferable that the convex portion 151 provided in the middle of the short side direction of the beam 15 contacts the inner surface of the lid 12, and that one end and the other end have a cut-off shape to reduce the weight of the beam.

The decorative layer can be anything that can hide the appearance of the cardboard by being layered on top of the cardboard. In the coffin 1 of this embodiment, the decorative layer 13 is made of a plastic sheet with a wood grain pattern and an adhesive layer placed on its back side. The pattern is not limited to a wood grain pattern and can be any appropriate one, or it can be unpatterned with only color. The decorative layer may also be made of a paper sheet.

In the cardboard coffin 1 of the above embodiment, multiple slits 14 are provided in both the cardboard constituting the coffin body 11 and the cardboard constituting the lid 12. The slits 14 may be provided in at least one of the cardboard constituting the lid and the cardboard constituting the coffin body.

The detailed structure of the coffin 1 will be described below. As shown in FIG. 9, the coffin body 11 includes a first exterior material 16 in which a pair of side walls 161 and a bottom plate 162 extending along the longitudinal direction are integrated, and a second exterior material 17 (gable material) that closes the openings at both ends in the longitudinal direction of the first exterior material 16. A wood-grain sheet is attached to the exterior surface of the side wall 161 as a decorative layer 13. A wood-grain sheet is also attached to the exterior surface of the second exterior material 17 as a decorative layer 13. The wood-grain sheet attached to the side wall 161 of the first exterior material 16 and the wood-grain sheet attached to the second exterior material 17 are attached so that the grain direction of the wood-grain sheet is consistent with that of the wood-grain sheet attached to the second exterior material 17. Therefore, when the side wall 161 and the second exterior material 17 are observed, the grain direction is consistent, and the impression that the coffin is made of natural wood can be created.

As shown in FIG. 11, the first exterior material 16 has a folding groove 18 at the boundary between the bottom plate 162 and the pair of side walls 161. The folding groove 18 is linear. The shape of the groove may be any suitable shape for folding the cardboard, and in the coffin 1 of this embodiment, a V-shaped groove is used. As shown in FIG. 2, the above-mentioned slit 14 for preventing warping is also a V-shaped groove. Therefore, when forming the folding groove 18 and the slit 14 for preventing warping in the cardboard, the same cutting device can be used for both. This further simplifies the manufacturing process. The slit for preventing warping is provided in a part other than the folded part of the cardboard.

In the coffin 1 of this embodiment, the first exterior material 16 is a plate material with a U-shaped cross section that extends along the longitudinal direction of the coffin, with openings provided at both ends in the longitudinal direction. The lid body 12 is also a plate material with a U-shaped cross section that extends along the longitudinal direction of the coffin, with openings provided at both ends in the longitudinal direction. The side wall 191 of the lid body 12 is shorter than the side wall 161 of the first exterior material.

The second exterior material 17 may have any shape that can close the opening of the first exterior material 16. In the coffin 1 of this embodiment, as shown in Figures 9 and 10, a cardboard 172 laminated with a decorative layer 13 is fitted inside a frame 171 with an opening, and the coffin is rectangular when viewed from the perspective along the longitudinal direction of the coffin. The frame 171 is provided with a protruding edge 173, and the second exterior material 17 is fixed to the first exterior material 16 by fitting the protruding edge 173 of the frame 171 into the openings at both ends formed by a pair of folded side walls 161 and a bottom plate 162 of the first exterior material 16, as shown by the arrows in Figure 9.

The lid body 12 is also constructed in the same manner as the first and second exterior materials of the coffin body 11. As shown in Figures 13 and 14, the lid body 12 includes a third exterior material 19 in which a pair of side walls 191 and a top plate 192 extending along the longitudinal direction are integrated, and a fourth exterior material 20 (gable material) that closes the openings at both ends in the longitudinal direction of the third exterior material 19. A wood-grain sheet is attached to the exterior surfaces of the side walls 191 and the top plate 192 as a decorative layer 13. A wood-grain sheet is also attached to the exterior surface of the fourth exterior material 20 as a decorative layer 13. The wood-grain sheet attached to the side walls 191 of the third exterior material 19 and the wood-grain sheet attached to the fourth exterior material 20 are attached so that the grain direction of the wood-grain sheet is consistent with the grain direction of the wood-grain sheet attached to the fourth exterior material 20. Therefore, when observing the side wall 191 of the third exterior material 19 and the fourth exterior material 20, the grain direction is consistent, giving the impression that the coffin is made of wood.

As shown in FIG. 13, the third exterior material 19 has a folding groove 18 at the boundary between the top plate 192 and a pair of side walls 191. The folding groove 18 is linear. The shape of the groove may be any shape suitable for folding cardboard, and the coffin 1 of this embodiment uses a V-shaped groove.

The fourth exterior material 20 may have any shape that can close the opening of the third exterior material 19, and in the coffin 1 of this embodiment, a cardboard 202 laminated with a decorative layer 13 is fitted inside a frame 201 with an opening. The frame 201 is provided with a protruding edge 203, and as shown by the arrows in Figure 13, the fourth exterior material 20 is fixed to the third exterior material 19 by fitting the protruding edge 203 of the frame 201 into the openings at both ends formed by a pair of folded side walls 191 and a bottom plate 192 of the third exterior material 19.

As shown in FIG. 1, when the coffin body 11, which is formed by fitting together the first exterior material 16 and the second exterior material 17, and the lid body 12, which is formed by fitting together the third exterior material 19 and the fourth exterior material 20, are fitted together, the frame body 171 and the protruding edge portion 173 of the second exterior material 17 come into contact with the frame body 201 and the protruding edge portion 203 of the fourth exterior material 20. When the lid body 12 is placed over the coffin body 11, the cardboard pieces do not come into contact with each other, but rather the frames come into contact with each other and the protruding edges come into contact with each other, thereby improving the rigidity of the coffin 1. This prevents the lid body from feeling like the feel of cardboard when placing it over the coffin body.

As shown in Figures 3 and 9, an edge reinforcement member 164 is fitted to the upper end of the side wall 161 of the coffin body 11. In the coffin 1 of this embodiment, the edge reinforcement member 164 is a long member with a U-shaped cross section, and is shaped so that it can be fitted into the upper end of the side wall 161.

Similarly, as shown in Figures 6 to 8, an edge reinforcement 194 is fitted to the lower end of the side wall 191 of the lid 12. In the coffin 1 of this embodiment, the edge reinforcement 194 is a long member with a U-shaped cross section, and is shaped so that it can be fitted into the lower end of the side wall 191. Therefore, when the lid 12 is placed over the coffin body 11, the edge reinforcement 164 and the edge reinforcement 194 come into contact, so that the sense of rigidity is not lost even in the area where the side wall 161 of the coffin body 11 and the side wall 191 of the lid come into contact.

3, 9, and 12, in the coffin 1 of this embodiment, a first interior material 22 and a second interior material 23 are fixed to the inner surface of the coffin body. The first interior material 22 and the second interior material 23 are symmetrical in the longitudinal direction and form a pair. As shown in FIG. 12, the first interior material 22 includes a bottom plate 222, a pair of side walls 221, and a V-shaped folding groove 18 that is the boundary between the bottom plate 222 and the pair of side walls 221, and is fixed to the bottom plate 162 (FIG. 9) of the coffin in the first exterior material 16 in a state in which the pair of side walls 221 are folded upward relative to the bottom plate 222. The second interior material 23 has a side wall 232, a pair of protruding edges 231, and a V-shaped folding groove 18 that is the boundary between the side wall 232 and the pair of protruding edges 231. The second interior material 23 has a pair of protruding edges 231 folded at a substantially right angle relative to the side walls 232, and the pair of protruding edges 231 are fixed from the outside to the pair of side walls 221 of the first interior material 22. Furthermore, the protruding edges 231 of the second interior material 23 are fixed to the inner surfaces of the pair of side walls 161 of the first exterior material 16. The second interior material 23 may also be fixed to the cardboard 172 (FIG. 10) of the second exterior material 17. In this way, the coffin 1 of this embodiment is reinforced by the first interior material 22 and the second interior material 23.

As shown in FIG. 4, a gap of the same size as the protruding edge 231 of the second interior material 23 is formed between the side wall 221 of the first interior material 22 and the side wall 161 of the first exterior material 16. With this structure, even if the side wall 221 of the first interior material 22 is distorted or warped, the effect is unlikely to extend to the side wall 161 of the first exterior material 16. As described above, the side wall 221 of the first interior material 22 is fixed to the pair of side walls 161 of the first exterior material 16 via the protruding edge 231 of the second interior material 23, so that a reinforcing effect is obtained.

In the coffin 1 of this embodiment, the first interior material 22 is a plate material with a U-shaped cross section extending along the longitudinal direction of the coffin, and is rectangular when viewed from above the coffin, and is shaped to be contained within the first exterior material 16, and the length of the side wall 221 of the first interior material 22 is shorter than the side wall 161 of the second exterior material 16. And, as shown in FIG. 3, a gap is arranged between the pair of first interior materials 22, in the middle of the coffin. This gap prevents the distortion of one interior material 22 from being transmitted to the other interior material 22 when distortion occurs in the first interior material 22. The second interior material 23 is rectangular when viewed from the longitudinal direction of the coffin 1, and is shaped so that the side wall 232 of the second interior material 23 is contained within the protruding edge portion 173 of the second exterior material 17.

As shown in FIG. 16, the coffin 1 of this embodiment is used with a decorative cover 124 attached to the inner surface of the lid 12 or the inner surface of the coffin body 11. As a result, no cardboard or cuts are visible on the inner surface of the lid 12 or the inner surface of the coffin body 11, giving it an appearance that is comparable to that of a wooden coffin. The cover can be made of fabric such as satin.

The lid 12 of the coffin 1 in this embodiment is provided with doors that can be opened and closed, as shown in Figure 1, and by opening the first door 301 and the second door 302, the face of the deceased can be seen through a through hole provided in the lid.

In the coffin 1 according to the embodiment described above, the top plate 192 constituting the lid 12, the pair of side walls 191, and the cardboard 202 of the fourth exterior material 20 are all made of cardboard consisting of multiple layers. The exterior surfaces of the top plate 192 constituting the lid 12, the pair of side walls 191, and the cardboard 202 of the fourth exterior material 20 are all covered with a decorative layer 13.

In the coffin 1 according to the above embodiment, the side walls 161 and bottom plate 162 of the first exterior material 16 constituting the coffin body 11, the cardboard 172 of the second exterior material 17, the side walls 221 and bottom plate 222 of the first interior material 22, and the side walls 232 and protruding edge portion 231 of the second interior material 23 are all made of multiple layers of cardboard. The exterior surfaces of the side walls 161 of the first exterior material 16 and the cardboard 172 of the second exterior material 17 are all covered with a decorative layer 13.

The coffin 1 according to the above embodiment has a rectangular parallelepiped shape when the lid 12 is placed over the coffin body 11. The shape of the coffin is not limited to this, and for example, the top plate of the lid may be configured as a curved surface, the lid and coffin body may have an oval shape when viewed from above, or the corners of the coffin may be rounded off.

Claims (4)

The coffin is made of cardboard.
At least one of the side walls of the coffin body and the lid is made of cardboard,
The cardboard has a decorative layer arranged on an exterior surface, and a linear cut that is not for folding is arranged on the inner surface opposite to the exterior surface,
The cardboard includes a first layer including a first liner and first corrugations;
a second layer including second corrugations;
A partition plate separating the first layer and the second layer is provided.
The slit has a depth that penetrates the first liner and the first corrugated body but does not penetrate the partition plate;
A cardboard coffin in which the slit is provided on the inner surface opposite the exterior surface of the side wall or lid, along the short direction of the side wall or lid . A cardboard coffin as described in claim 1, in which the linear slit is provided vertically on the side wall of the coffin body and is long enough to leave some extra space so that it does not reach the bottom end of the side wall of the coffin body. A cardboard coffin as claimed in claim 1 or 2, in which the linear cuts are arranged in both the short and long directions of the lid body. 4. The cardboard coffin according to claim 1, wherein a reinforcing material is arranged on the inner surface of the lid to support the weight of the lid.

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