Bed frame

Abstract

To provide a bed frame capable of closing side parts of a frame body and also suppressing deformation of the side parts of the frame body while reducing the number of components of the frame body.SOLUTION: A bed frame 1A comprises frame bodies 2 each of which includes: corrugated cardboard first main frames 10A and first sub-frames 20. The first sub-frame 20 is assembled to the first main frame 10A. The first main frame 10A includes: a support board 11; and outer leg plate 12 and inner leg plate 13 continuously arranged from the support plate 11. The first main frame 10A includes: cylindrical holding parts 15 formed in the support plate 11; and core materials 16 inserted to the holding parts 15. The first sub-frame 20 is assembled to the inner leg plate 13, and the outer leg plate 12 covers an end part of the first sub-frame 20. The end part of the core material 16 is supported by an upper edge part of the first sub-frame 20.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a cardboard bed frame.

Background Art

[0002] Some cardboard bed frames include a frame body having a first frame extending in the front-rear direction and a second frame extending in the left-right direction (see, for example, Patent Document 1). In the above-described first frame, a support beam extending in the front-rear direction and left and right foot plates extending downward from the support beam are formed, and the second frame is assembled to both the left and right foot plates.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described conventional bed frame, the second frame is inserted into a slit formed in the foot plate. In this configuration, since the second frame is assembled to intersect the foot plate, the end portion of the second frame protrudes from the outer surface of the frame body. In the above-described conventional bed frame, a cardboard cover is attached to the outer portion of the frame body, and the end portion of the second frame is covered by the cover. In the above-described conventional bed frame, since the frame body and the cover are separate bodies, there are problems that the number of parts increases and the assembly work becomes complicated, and the thin plate-shaped cover is easily deformed.

[0005] An object of the present invention is to solve the above-described problems, reduce the number of parts of the frame body, be able to close the side portion of the frame body, and further provide a bed frame in which the side portion of the frame body is less likely to be deformed.

Means for Solving the Problems

[0006] To solve the above problems, the present invention provides a bed frame, which comprises a frame body having a first main frame made of cardboard and extending in the front-rear direction, and a sub-frame made of cardboard and extending in the left-right direction. Two of the first main frames are arranged side by side in the left-right direction, and the sub-frame is assembled to both of the first main frames. The first main frame includes a support plate extending in the front-rear direction, an outer foot plate continuously provided at the outer edge in the left-right direction of the support plate via a fold line and extending downward from the support plate, and an inner foot plate continuously provided at the inner edge in the left-right direction of the support plate via a fold line and extending downward from the support plate. Further, the first main frame includes a cylindrical holding portion formed on the lower surface of the middle portion in the front-rear direction of the support plate, and a core material inserted into the holding portion. The sub-frame is assembled to the inner foot plate, and the left-right ends of the sub-frame are covered by the outer foot plate. The core material is supported by the upper edge portion of the sub-frame.

[0007] In the bed frame of the present invention, the core material assembled to the holding portion of the frame body is supported by the sub-frame, and the frame body is reinforced by the core material, so that sufficient load-bearing capacity can be ensured.

[0008] Further, in the bed frame of the present invention, the outer foot plate is continuously provided to the support plate via a fold line, and the structure is such that the sub-frame is not assembled to the outer foot plate. Therefore, the entire outer foot plate can be formed flat, and the ends of the sub-frame can be covered by the outer foot plate. Thereby, the side portion of the frame body can be closed without using a cover separate from the frame body, and the ends of the sub-frame can be prevented from being exposed on the side portion of the frame body.

[0009] Moreover, in the bed frame of the present invention, since the outer foot plate is continuously provided to the support plate via a fold line, the number of parts of the frame body can be reduced and the man-hours for assembly work can be reduced. In addition, the outer footboard of the bed frame of the present invention is a structural component of the frame body. Since the strength of the outer footboard is high, it is difficult for the outer footboard to deform.

[0010] In the above-described bed frame, the outer footboard and the inner footboard are respectively connected to the front and rear portions of the support plate, and the sub-frame is respectively assembled to the front and rear portions of the first main frame, and the front and rear end portions of the core material can be supported on the upper edge portions of the front and rear sub-frames.

[0011] In this configuration, an accommodation space for accommodating a bag, a box, etc. is formed between the front and rear outer footboards and between the front and rear inner footboards of the frame body. A core material is assembled to the holding portion disposed above the accommodation space. In addition, the front and rear end portions of the core material are supported by the front and rear sub-frames. Thus, since the portion disposed above the accommodation space in the frame body is reinforced by the core material, the load-bearing capacity of the bed frame having the accommodation space can be sufficiently ensured.

[0012] In the above-described bed frame, a second main frame extending in the front-rear direction is provided on the frame body, at least one second main frame is disposed between the two first main frames, and the sub-frame is assembled to the second main frame. In this configuration, by setting the number of the second main frames according to the size of the frame body, frame bodies of various sizes with sufficient load-bearing capacity can be formed.

[0013] In the above-described bed frame, it is preferable to continuously provide a connecting plate on the side edge portion in the front-rear direction of the outer footboard, bend the connecting plate inward with respect to the outer footboard, and assemble the tip end portion of the connecting plate to the sub-frame.

[0014] In this way, by fixing the outer footboard to the frame body, the strength of the frame body can be increased. Also, by bending the connecting plate inward with respect to the outer foot plate, the cut edge of the cardboard is not exposed on the side of the frame body, so that hands and feet do not touch the cut edge when using the bed frame.

[0015] In the above-described bed frame, a first end plate is continuously provided on the outer side edge portion in the front-rear direction of the outer foot plate, and the first end plate is bent inward with respect to the outer foot plate. Further, a second end plate is continuously provided on the outer side edge portion in the front-rear direction of the inner foot plate. Then, the tip end portion of the first end plate is assembled to the second end plate.

[0016] In this way, by fixing the outer foot plate and the inner foot plate, the strength of the frame body can be increased. Also, by bending the first end plate inward with respect to the outer foot plate, the cut edge of the cardboard is not exposed on the side of the frame body, so that hands and feet do not touch the cut edge when using the bed frame.

[0017] In the above-described bed frame, it is preferable that the steps of the cardboard constituting the outer foot plate and the inner foot plate are extended in the vertical direction, and the steps of the cardboard constituting the core material are extended in the front-rear direction. In this configuration, since the steps of the cardboard constituting the core material extend in the longitudinal direction of the core material, the core material is difficult to bend. Further, since the steps of the cardboard constituting the outer foot plate and the inner foot plate extend in the vertical direction, the strength of the outer foot plate and the foot plate against the load from above is increased.

Effect of the Invention

[0018] The bed frame of the present invention can sufficiently ensure the load resistance, and further, while reducing the number of parts of the frame body, closes the side portion of the frame body and makes the side portion of the frame body difficult to deform.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Mode for Carrying Out the Invention

[0020] Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the description of each embodiment, the same reference numerals are given to the same components, and duplicate descriptions are omitted.

[0021] In the following description, the front-rear, left-right directions are set for convenience in explaining the bed frame of the present embodiment, and do not limit the configuration of the bed frame. In the present embodiment, the longitudinal direction of the bed frame is the front-rear direction, and the width direction of the bed frame is the left-right direction.

[0022] [First Embodiment] As shown in FIGS. 1 and 2, the bed frame 1A of the first embodiment includes two frame bodies 2, 2 arranged in the front-rear direction and a headboard 4 attached to the frame body 2.

[0023] In the bed frame 1A of the first embodiment, the frame body 2 and the headboard 4 are formed using only cardboard. Further, in the bed frame 1A of the first embodiment, each part is assembled by fitting the cardboard pieces together without using an adhesive means such as an adhesive or an adhesive tape. Note that each part of the bed frame 1A may be appropriately subjected to flameproofing and waterproofing.

[0024] As shown in FIGS. 3 and 4, the frame body 2 includes two left and right first main frames 10A, 10A extending in the front-rear direction and a second main frame 10B extending in the front-rear direction. Further, the frame body 2 includes two front and rear first sub-frames 20, 20 extending in the left-right direction and two front and rear second sub-frames 30, 30 extending in the left-right direction. In the frame body 2 of the first embodiment, the left and right first main frames 10A, 10A are arranged at a predetermined interval in the left-right direction, and the second main frame 10B is arranged between both first main frames 10A, 10A. The first sub-frames 20 and the second sub-frames 30 are respectively assembled to the front and rear portions of both the first main frames 10A, 10A and the second main frame 10B.

[0025] As shown in FIG. 3, the first main frame 10A includes a support plate 11 extending in the front-rear direction. Also, as shown in FIG. 5, front and rear outer foot plates 12, 12 extend downward from the front and rear portions of the outer edges in the left-right direction of the support plate 11, and front and rear inner foot plates 13, 13 extend downward from the front and rear portions of the inner edges in the left-right direction of the support plate 11. Further, two cylindrical holding portions 15, 15 are formed on the lower surface of the middle portion in the front-rear direction of the support plate 11. As shown in FIG. 12, a core material 16 is inserted into the holding portion 15.

[0026] As shown in FIG. 6, the support plate 11, the outer foot plates 12, the inner foot plates 13, and the holding portion 15 are formed by mountain folding or valley folding a blank sheet S1 cut out from a single cardboard sheet at each grid line. The blank sheet S1 shown in FIG. 6 is arranged so that the inner surface side is visible. The fold lines of the blank sheet S1 are grid lines (pressed grid lines) formed by linearly pressing the surface of the blank sheet S1. Note that intermittent cuts may be formed in the grid lines. In this way, it becomes easier to bend the blank sheet S1 at the fold lines. Alternatively, a broken line may be formed by intermittently forming half-cut incisions that cut only the surface of the sheet or incisions that penetrate the sheet in a linear shape.

[0027] As shown in FIG. 2, the support plate 11 is a flat plate extending in the front-rear direction. As shown in FIG. 5, front and rear outer foot plates 12, 12 are connected to the front and rear edges of the outer side in the left-right direction (the outer side in the left-right direction of the frame body 2) of the support plate 11 via broken lines, respectively. Also, front and rear inner foot plates 13, 13 are connected to the front and rear edges of the inner side in the left-right direction (the central side in the left-right direction of the frame body 2) of the support plate 11 via broken lines, respectively (see FIG. 6). The outer foot plate 12 and the inner foot plate 13 are bent vertically downward with respect to the support plate 11.

[0028] As shown in FIG. 6, the outer foot plate 12 and the inner foot plate 13 are substantially square flat plates, and the corrugation L1 (the extending direction of the flute) of the cardboard extends in the vertical direction. No slits or openings are formed in the outer foot plate 12, and the outer foot plate 12 is formed in a flat plate shape. In the inner foot plate 13, a first slit L11 extending upward from the lower edge and two second slits L12, L12 are formed. The first slit L11 and both second slits L12, L12 extend from the lower edge of the inner foot plate 13 to the central portion in the height direction. The groove width of the first slit L11 is formed larger than the groove widths of both second slits L12, L12. As shown in FIG. 5, in the front inner foot plate 13, the second slit L12 is disposed in front of the first slit L11, and in the rear inner foot plate 13, the second slit L12 is disposed behind the first slit L11.

[0029] The left and right holding parts 15, 15 are formed at positions between the front and rear outer foot plates 12, 12 and between the front and rear inner foot plates 13, 13 on the lower surface of the support plate 11. The holding part 15 is formed in a square tube shape composed of left and right side walls and a lower plate with the support plate 11 as the upper plate. As shown in FIG. 6, the holding part 15 is formed by bending a strip-shaped part continuously provided at the middle part of the left and right edges of the support plate 11 in the left-right direction into a tube shape. As shown in FIG. 5, the left and right holding parts 15, 15 are arranged side by side in contact with each other in the left-right direction. By fitting a locking piece 15a (see FIG. 6) formed on the lower plate of one holding part 15 into a connecting hole 15b (see FIG. 6) formed on the lower plate of the other holding part 15, the left and right holding parts 15, 15 are connected.

[0030] As shown in FIG. 10, the core material 16 is a rod-shaped member extending in the front-rear direction. As shown in FIG. 11, the corrugations L1 of the cardboard constituting the core material 16 extend in the front-rear direction. The core material 16 is formed by folding a blank sheet S5 cut out from a single cardboard sheet at each fold line by mountain folding or valley folding. The blank sheet S5 shown in FIG. 11 is arranged so that the inner surface side is visible. As shown in FIG. 10, the core material 16 of the first embodiment has a peripheral wall formed by doubling and overlapping cardboard sheets. Further, a locking structure for fixing the shape of the core material 16 is provided by fitting a locking piece 16b (see FIG. 11) provided on the peripheral wall into a connecting hole 16c (see FIG. 11).

[0031] As shown in FIG. 12, the core material 16 is inserted into the holding part 15. Thereby, the core material 16 is held by the first main frame 10A in a state of being overlapped on the lower surface (inner surface) of the support plate 11. In the first embodiment, as shown in FIG. 14, the core material 16 is placed on the inner surface of the blank sheet S1 and surrounded by the part that becomes the holding part 15, so that the core material 16 is inserted into the holding part 15 as shown in FIG. 12. The front end part of the core material 16 protrudes forward from the holding part 15, and the rear end part of the core material 16 protrudes rearward from the holding part 15.

[0032] As shown in FIG. 10, two front and rear positioning pieces 16a, 16a protrude from the lower part of the outer surface of the core material 16. As shown in FIG. 13, the front positioning piece 16a is configured to engage with the front edge of the holding part 15, and the rear positioning piece 16a is configured to engage with the rear edge of the holding part 15. That is, the lower plate of the holding part 15 is disposed between the front and rear positioning pieces 16a, 16a, so that the core material 16 is positioned with respect to the holding part 15.

[0033] As shown in FIG. 5, the second main frame 10B has substantially the same configuration as the first main frame 10A, except that inner foot plates 13, 13 are continuously provided on both the left and right outer edges and inner edges of the support plate 11. The support plate 11, the inner foot plate 13, and the holding part 15 of the second main frame 10B are formed by mountain folding or valley folding the cardboard blank sheet S2 shown in FIG. 7 at each fold line. The blank sheet S2 shown in FIG. 7 is arranged so that the inner surface side is visible.

[0034] The first sub-frame 20 is formed by triple folding the cardboard blank sheet S3 shown in FIG. 8 at each fold line (see FIG. 13). The blank sheet S3 shown in FIG. 8 is arranged so that the inner surface side is visible. The first sub-frame 20 of the first embodiment has a configuration in which three flat plates 21 are triple-layered by folding the blank sheet S3. As shown in FIG. 5, four slits L21 that are recessed downward from the upper edge are formed in the first sub-frame 20.

[0035] By combining the slits L21 of the first sub-frame 20 with the first slits L11 of the inner foot plates 13 of the left and right first main frames 10A, 10A and the second main frame 10B, the first sub-frame 20 is assembled to the inner foot plates 13 of both the first main frames 10A, 10A and the second main frame 10B as shown in FIG. 4.

[0036] As shown in FIG. 5, at the upper edge of the first sub-frame 20, the portion disposed directly below the support plate 11 is formed lower than other portions. And as shown in FIG. 13, the front and rear ends of the core material 16 are placed on the upper edges of the front and rear first sub-frames 20, 20. In this way, the front and rear ends of the core material 16 are respectively supported by the front and rear first sub-frames 20, 20.

[0037] The second sub-frame 30 is formed by folding the cardboard blank sheet S4 shown in FIG. 9 along the fold lines with mountain folds. The blank sheet S4 shown in FIG. 9 is arranged so that the inner surface side is visible.

[0038] As shown in FIG. 5, the second sub-frame 30 includes a bottom plate 31 extending in the left-right direction and front and rear insertion plates 32, 32 extending upward from the front and rear edges of the bottom plate 31. That is, the second sub-frame 30 has a U-shaped cross-section. Four slits L31 recessed downward from the upper edge are formed in the insertion plate 32 of the second sub-frame 30.

[0039] By combining the slits L31, L31 of the two insertion plates 32, 32 of the second sub-frame 30 with the two second slits L12, L12 of the inner foot plates 13 of the first main frame 10A and the second main frame 10B, as shown in FIG. 4, the second sub-frame 30 is assembled to the inner foot plates 13 of both the first main frames 10A, 10A and the second main frame 10B.

[0040] The frame body 2 is formed by respectively assembling the first sub-frame 20 and the second sub-frame 30 to the front and rear parts of the left and right first main frames 10A, 10A and the second main frame 10B and fixing the left and right first main frames 10A, 10A and the second main frame 10B in a side-by-side state in the left-right direction. In the frame body 2, an accommodation space S is formed between the front and rear outer foot plates 12, 12 and between the front and rear inner foot plates 13, 13. The accommodation space S is a space for accommodating luggage such as bags and boxes, and is open to the left and right side surfaces of the frame body 2 (see Fig. 1).

[0041] In the first main frame 10A of the first embodiment, as shown in Fig. 5, in the outer foot plate 12, connecting plates 17, 17 are respectively connected to the front and rear side edges via fold lines (see Fig. 6). The connecting plate 17 is a strip-shaped part formed along the side edge of the outer foot plate 12. The connecting plate 17 is bent inward (back side) with respect to the outer foot plate 12. Locking pieces 17a, 17b (see Fig. 6) project from the tip of the connecting plate 17.

[0042] As shown in Fig. 4, by fitting the locking piece 17a formed on the connecting plate 17 on the accommodation space S side into the connecting hole 20a formed in the first sub-frame 20 from the accommodation space S side, the tip of the connecting plate 17 is assembled to the first sub-frame 20. By fitting the locking piece 17b formed on the connecting plate 17 on the opposite side of the accommodation space S into the connecting hole 30a formed in the second sub-frame 30 from the opposite side of the accommodation space S, the tip of the connecting plate 17 is assembled to the second sub-frame 30. Thereby, the outer foot plate 12 is fixed to the first sub-frame 20 and the second sub-frame 30.

[0043] As shown in Fig. 3, the bed frame 1A of the first embodiment includes two covers 3, 3 that cover the front and rear ends of the frame body 2. The front and rear covers 3, 3 are cardboard sheets and are formed according to the shape of the ends of the frame body 2. The upper edge, lower edge, and side edges of the cover 3 are bent inward (back side). The upper edge of the cover 3 is inserted into the connecting groove formed on the upper surface of the frame body 2. Also, the lower edge of the cover 3 is inserted into the connecting groove formed on the lower surface of the frame body 2. In this way, as shown in Fig. 2, the cover 3 is attached to the front and rear ends of the frame body 2 without using adhesive means.

[0044] In the bed frame 1A of the present embodiment, as shown in FIG. 1, two frame bodies 2, 2 are arranged continuously in the front-rear direction. In the present embodiment, both frame bodies 2, 2 are connected using two connecting insertion plates 5, 5. As shown in FIG. 2, the connecting insertion plate 5 is formed by vertically bending the front and rear portions of a cardboard flat plate downward with respect to the intermediate portion. The front portion of the connecting insertion plate 5 is inserted from above into the gap between the rear cover 3 and the rear second sub-frame 30 in the front frame body 2 (see FIG. 1). The rear portion of the connecting insertion plate 5 is inserted from above into the gap between the front cover 3 and the front second sub-frame 30 in the rear frame body 2 (see FIG. 1). Thus, in the bed frame 1A of the present embodiment, as shown in FIG. 1, the two frame bodies 2, 2 are connected in a state of being continuous in the front-rear direction by the two connecting insertion plates 5, 5.

[0045] The bed frame 1A is used by laying a bedding such as a mattress on the upper surfaces of both frame bodies 2, 2. Note that a cardboard floor board may be laid across the upper surfaces of the front and rear frame bodies 2, 2.

[0046] The headboard 4 is erected on the upper surface of the front frame body 2. As shown in FIG. 2, the headboard 4 includes two columns 70, 70 extending in the vertical direction and a wall portion 80 assembled to the upper portions of both columns 70, 70.

[0047] As shown in FIG. 16, the column 70 includes a column body 71 extending in the vertical direction and a support portion 72 formed at the upper portion of the column body 71. The corrugations of the cardboard constituting the column body 71 and the support portion 72 extend in the vertical direction.

[0048] As shown in FIG. 17, the column 70 is formed by mountain-folding or valley-folding a blank sheet S6 obtained by cutting out a single cardboard sheet at each fold line. The blank sheet S6 shown in Fig. 17 is arranged so that the inner surface side is visible. Each fold line of the blank sheet S6 is a ruled line (pressed ruled line) formed by pressing into the surface of the blank sheet S6. Note that a notch may be formed in the ruled line. By doing so, it becomes easier to bend the blank sheet S6 at the fold line. Also, a fold line may be formed by intermittently forming half-cut notches that cut only the surface of the sheet or notches that penetrate the sheet in a linear shape. As shown in Fig. 16, the blank sheet S6 is provided with a locking structure including a locking piece 70a and a connecting hole 70b for fixing the shape of the formed support column 70 (see Fig. 17).

[0049] As shown in Fig. 18, the column body 71 is a square tube-shaped member extending in the vertical direction. The lower part of the column body 71 is inserted between the first main frame 10A and the second main frame 10B as shown in Fig. 2, and is also inserted between the front and rear insertion plates 32, 32 of the second sub-frame 30. In this way, the column body 71 is erected at the front edge portion of the upper surface of the frame body 2.

[0050] As shown in Fig. 16, the support portion 72 is continuously provided on the front surface of the upper part of the column body 71 and protrudes forward from the lower part of the column body 71. The support portion 72 is a square tube-shaped member extending in the vertical direction along the column body 71. In the blank sheet S6 shown in Fig. 17, the portion that becomes the support portion 72 is continuously provided above the column body 71 via a fold line. Then, as shown in Fig. 18, after forming the column body 71 and the support portion 72 into a square tube shape, the support portion 72 is folded back with respect to the column body 71, thereby forming the support column 70 shown in Fig. 16.

[0051] When the lower part of the column body 71 is assembled to the frame body 2 (see Fig. 1), the lower edge portion of the support portion 72 is placed on the upper edge portion of the cover 3. In this way, the lower edge portion of the support portion 72 is supported on the upper surface of the frame body 2 (see Fig. 1).

[0052] The wall portion 80 is a box body that covers the upper portions of both struts 70, 70. As shown in FIG. 15, the upper portion of the column main body 71 and the support portion 72 are accommodated inside the wall portion 80. The edge portion of the wall portion 80 is bent inward (back side). On the upper surface of the wall portion 80, as shown in FIG. 1, two recessed portions 81, 81 for placing small items such as mobile phones and glasses are formed.

[0053] In the bed frame 1A of the first embodiment as described above, as shown in FIG. 1, an accommodation space S for accommodating bags, boxes, etc. is formed between the front and rear outer foot plates 12, 12 and between the front and rear inner foot plates 13, 13 of the frame body 2. And a core material 16 is assembled to the holding portion 15 disposed above the accommodation space S, as shown in FIG. 13. The front and rear end portions of the core material 16 are respectively supported by the front and rear first sub-frames 20, 20. Thus, in the bed frame 1A of the first embodiment, since the portion disposed above the accommodation space S in the frame body 2 is reinforced by the core material 16, even if the accommodation space S is provided in the cardboard frame body 2, sufficient load-bearing capacity can be ensured.

[0054] In the bed frame 1A of the first embodiment, as shown in FIG. 1, the entire outer foot plate 12 is formed flat, and since the end portion of the first sub-frame 20 is covered by the outer foot plate 12, the end portion of the first sub-frame 20 is not exposed on the side portion of the frame body 2. In the bed frame 1A of the first embodiment, since the outer foot plate 12 is continuously provided with the support plate 11 via a fold line (see FIG. 6), the number of parts of the frame body 2 can be reduced and the man-hours for assembly work can be reduced. The outer foot plate 12 of the bed frame 1A of the first embodiment is a structural component of the frame body 2, and since the strength of the outer foot plate 12 is high, the outer foot plate 12 is less likely to be deformed compared to the case where a separate cover is attached.

[0055] In the bed frame 1A of the first embodiment, by assembling the tip portions of the connecting plates 17 continuously provided on the side edge portions of the outer foot plates 12 to the first sub-frame 20 or the second sub-frame 30, since the outer foot plates 12 are fixed to the frame body 2, the strength of the frame body 2 can be increased. Also, by bending the connecting plates 17 inward with respect to the outer foot plates 12, the cut edges of the cardboard are not exposed on the side portions of the frame body 2, so that hands and feet do not touch the cut edges when using the bed frame 1A.

[0056] In the bed frame 1A of the first embodiment, since the steps of the cardboard constituting the core material 16 shown in FIG. 13 extend in the longitudinal direction of the core material, the core material 16 is difficult to bend. Further, in the bed frame 1A of the first embodiment, since the steps of the cardboard constituting the outer foot plates 12 and the inner foot plates 13 extend in the vertical direction, the strength of the outer foot plates 12 and the inner foot plates 13 against the load from above is increased.

[0057] In the frame body 2 of the first embodiment, since the axial cross section of the second sub-frame 30 is U-shaped, it is possible to effectively prevent the frame body 2 from being distorted in the front-rear direction and the left-right direction.

[0058] As shown in FIG. 2, the bed frame 1A of the first embodiment is provided with a headboard 4. The steps of the cardboard constituting the support columns 70 of the headboard 4 extend in the vertical direction. By doing so, the strength of the support columns 70 against the force acting from the front-rear direction is increased. Also, as shown in FIG. 15, a support portion 72 is provided at the upper portion of the support column 70, and the lower edge portion of this support portion 72 is supported by the upper surface of the frame body 2 shown in FIG. 1. Thereby, when a user lying on the bed frame 1A leans against the rear surface of the headboard 4, the headboard 4 can surely support the load.

[0059] As described above, the first embodiment of the present invention has been described, but the present invention is not limited to the first embodiment, and can be appropriately changed without departing from the gist thereof. In the frame body 2 of the first embodiment, as shown in FIG. 1, one second main frame 10B is arranged between the left and right first main frames 10A, 10A. However, the number of the second main frames 10B is not limited and is appropriately set according to the width of the bed frame 1A and the allowable load capacity.

[0060] In the bed frame 1A of the first embodiment, two frame bodies 2, 2 are arranged in the front - rear direction. However, the number of the frame bodies 2 is not limited. For example, by increasing the length of the frame body 2 in the front - rear direction, the bed frame 1A may be constituted by one frame body 2. Also, by arranging the frame bodies 2 in the left - right direction, the width of the bed frame 1A can be widened.

[0061] In the frame body 2 of the first embodiment, as shown in FIG. 4, a first sub - frame 20 and a second sub - frame 30 are provided. However, only the first sub - frame 20 may be provided. Also, the first sub - frame 20 of the first embodiment is formed by folding a single cardboard sheet into three layers (see FIG. 13). However, the number of layers to be laminated is not limited. For example, the first sub - frame 20 may be constituted by a single non - folded single - layer sheet.

[0062] The core material 16 of the first embodiment is a rod - shaped member and is formed by folding a single cardboard sheet. However, the configuration of the core material 16 is not limited. For example, the core material 16 may be constituted by a single flat plate or may be constituted by stacking a plurality of flat plates. In the first embodiment, as shown in FIG. 12, two core materials 16, 16 are provided on the first main frame 10A. However, the number of the core materials 16 is not limited. For example, only one core material 16 may be provided on the first main frame 10A.

[0063] In the bed frame 1A of the first embodiment, as shown in FIG. 1, a headboard 4 is provided, but the configuration of the headboard 4 is not limited. Furthermore, the headboard 4 may not be provided on the bed frame 1A.

[0064] [Second Embodiment] Next, the bed frame 1B of the second embodiment will be described. The bed frame 1B of the second embodiment is different from the bed frame 1A of the first embodiment (see FIG. 1) in that, as shown in FIG. 19, no headboard is provided. Also, in the bed frame 1B of the second embodiment, since it is not necessary to insert the support columns of the head frame into the second sub-frame 30A, the second sub-frame 30A has a configuration in which two flat plates are overlapped. In the bed frame 1B of the second embodiment, the width of the second sub-frame 30A in the front-rear direction is formed to be smaller by the amount that it is narrower than the second sub-frame 30 (see FIG. 5) of the first embodiment.

[0065] Although the second embodiment of the present invention has been described above, the present invention is not limited to the second embodiment, and can be appropriately changed within the scope not departing from the gist thereof, similar to the first embodiment.

[0066] [Third Embodiment] Next, the bed frame of the third embodiment will be described. As shown in FIG. 20, the bed frame of the third embodiment is different from the bed frame 1A of the first embodiment (see FIG. 3) in the configuration of the front-rear end portions of the first main frame 10A. The support plate 11, the outer foot plate 12, the inner foot plate 13, and the holding portion 15 of the first main frame 10A of the third embodiment are formed by mountain folding or valley folding the blank sheet S7 shown in FIG. 21 at each grid line. The blank sheet S7 shown in FIG. 21 is arranged so that the inner surface side is visible.

[0067] In the first main frame 10A of the third embodiment, a first end plate 18A is continuously provided at the outer side edge portion in the front-rear direction of the outer foot plate 12. Further, a second end plate 18B is continuously provided at the outer side edge portion in the front-rear direction of the inner foot plate 13. The first end plate 18A is bent inward (back side) with respect to the outer foot plate 12, and the second end plate 18B is bent inward (back side) with respect to the inner foot plate 13. Then, the first end plate 18A is overlapped on the outer surface of the second end plate 18B, and the locking piece 18c (see FIG. 21) formed at the tip of the first end plate 18A is inserted into the connecting hole 18d (see FIG. 21) formed in the second end plate 18B and assembled, whereby the first end plate 18A and the second end plate 18B are connected.

[0068] In this way, by fixing the outer foot plate 12 and the inner foot plate 13 with the first end plate 18A and the second end plate 18B, the strength of the first main frame 10A can be increased. Further, by bending the first end plate 18A inward with respect to the outer foot plate 12, the cut edge of the cardboard is not exposed on the side portion of the first main frame 10A, so that hands and feet do not touch the cut edge when using the bed frame.

[0069] As described above, the third embodiment of the present invention has been described. However, the present invention is not limited to the third embodiment, and can be appropriately changed within the scope not departing from the gist thereof, similarly to the first embodiment.

Explanation of Signs

[0070] 1A Bed frame (first embodiment) 1B Bed frame (second embodiment) 2 Frame body 3 Cover 4 Headboard 5 Insertion plate for connection 10A First main frame 10B Second main frame 11 Support plate 12 Outer foot plate 13 Inner foot plate 15 Holding portion 16 Core material 16a Positioning piece 17 Connecting plate 17a Locking piece 17b Locking piece 18A First end plate 18B Second end plate 20 First sub-frame 20a Connecting hole 21 Flat plate part 30 Second sub-frame (first embodiment) 30A Second sub-frame (second embodiment) 30a Connecting hole 31 Bottom plate 32 Insertion plate 70 Support column 71 Column body 72 Support part 80 Wall part 81 Depression part L11 First slit L12 Second slit L21 Slit L31 Slit S Accommodation space S1 Blank sheet of the first main frame (first embodiment) S2 Blank sheet of the second main frame S3 Blank sheet of the first sub-frame S4 Blank sheet of the second sub-frame S5 Blank sheet of the core material S6 Blank sheet of the support column S7 Blank sheet of the first main frame (third embodiment)

Claims

1. A frame body having a first main frame made of cardboard extending in the front-rear direction and a sub-frame made of cardboard extending in the left-right direction, wherein two of the first main frames are arranged side by side in the left-right direction, and the sub-frame is assembled to both of the first main frames, the first main frame comprising: a support plate extending in the front-rear direction, outer foot plates connected to the outer edges in the left-right direction of the support plate via fold lines and extending downward from the support plate, inner foot plates connected to the inner edges in the left-right direction of the support plate via fold lines and extending downward from the support plate, a cylindrical holding portion formed on the lower surface of the middle portion in the front-rear direction of the support plate, and a core material inserted into the holding portion, wherein the sub-frame is assembled to the inner foot plates, and the left and right ends of the sub-frame in the left-right direction are covered by the outer foot plates, and the core material is supported by the upper edge portion of the sub-frame. A bed frame characterized by this.

2. The bed frame according to claim 1, wherein the outer foot plates and the inner foot plates are respectively connected to the front and rear portions of the support plate, the sub-frame is assembled to the front and rear portions of the first main frame respectively, and the front and rear ends of the core material are supported by the upper edge portions of the front and rear sub-frames. A bed frame characterized by this.

3. The bed frame according to claim 1, wherein the frame body has a second main frame extending in the front-rear direction, at least one of the second main frames is arranged between both of the first main frames, and the sub-frame is assembled to the second main frame. A bed frame characterized by this.

4. The bed frame according to claim 1, wherein a connecting plate is connected to the side edges in the front-rear direction of the outer foot plates, the connecting plate is bent inward with respect to the outer foot plates, and the tip of the connecting plate is assembled to the sub-frame. A bed frame characterized by this.

5. The bed frame according to claim 1, wherein a first end plate is connected to the outer side edges in the front-rear direction of the outer foot plates, the first end plate is bent inward with respect to the outer foot plates, a second end plate is connected to the outer side edges in the front-rear direction of the inner foot plates, and the first end plate and the second end plate are connected. A bed frame characterized by this.

6. ​ The bed frame according to claim 1, wherein the corrugations of the cardboard forming the outer foot plate and the inner foot plate extend in the vertical direction, and the corrugations of the cardboard forming the core material extend in the front-rear direction.

Images