Mattress fasteners and laminated mattresses

Abstract

To provide a mattress fixing tool that can easily fix stacked mattresses.SOLUTION: A mattress fixing tool fixes a first mattress and a second mattress located on the first mattress, and comprises a first joint part attachable / detachable to / from a lower surface of the first mattress, a second joint part attachable / detachable to / from an upper surface of the second mattress, and a connection part extending in a vertical direction along a side surface of the first mattress and a side surface of the second mattress, and connecting the first joint part and the second joint part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] Embodiments of the present invention relate to a mattress fixture and a laminated mattress.

Background Art

[0002] It is known to fix a plurality of mattresses by using a surface fastener on the contact surface between the upper mattress and the lower mattress (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For the mattress described in Patent Document 1, since the surface fastener must be fixed to the mattress in advance by sewing or an adhesive, there is a risk of increasing the manufacturing cost of the mattress. Also, for example, when disposing of the mattress, the surface fastener must be removed from the mattress, which may make the mattress disposal work troublesome.

[0005] Embodiments of the present invention provide a mattress fixture and a laminated mattress that can easily fix the laminated mattresses.

Means for Solving the Problems

[0006] The mattress fastener according to the embodiment is a mattress fastener for fastening a first mattress and a second mattress located on the first mattress, and is characterized by comprising: a first connecting portion that is detachable from the lower surface of the first mattress; a second connecting portion that is detachable from the upper surface of the second mattress; and a connecting portion that extends vertically along the side surface of the first mattress and the side surface of the second mattress and connects the first connecting portion and the second connecting portion. [Effects of the Invention]

[0007] Embodiments of the present invention can provide a mattress fastener and a stacked mattress that can easily secure stacked mattresses. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing a laminated mattress using a mattress fixing device according to the first embodiment of the present invention. [Figure 2] This is a cross-sectional view showing the first mattress, the second mattress, and the mattress fasteners. [Figure 3] This is a perspective view showing a laminated mattress using a mattress fastener according to a second embodiment of the present invention. [Figure 4] This is a perspective view showing the mattress fastener as a standalone unit. [Figure 5] Figure 4 shows cross-sectional views of the mattress fasteners from the directions indicated by arrows AA, BB, and CC. [Figure 6] This is a perspective view showing the second support part of the mattress fastener as a standalone unit. [Figure 7] This is a disassembled view of the mattress fastener. [Figure 8] This is a cross-sectional view showing the process of securing the first mattress and the second mattress together using mattress fasteners. [Figure 9] This is a cross-sectional view showing the first mattress and the second mattress secured together by a mattress fastener. [Figure 10]It is an explanatory diagram showing a mattress fixture and a laminated mattress according to a third embodiment of the present invention. [Figure 11] It is a cross-sectional view showing a laminated mattress using a mattress fixture according to a fourth embodiment of the present invention. [Figure 12] It is a perspective view showing a laminated mattress using a mattress fixture according to a first modification of the present invention. [Figure 13] It is a front view showing a shaft portion of a mattress fixture according to a second modification of the present invention. [Figure 14] It is a perspective view showing a mattress fixture according to a third modification of the present invention. [Figure 15] It is a cross-sectional view similar to FIG. 2 showing a first mattress, a second mattress, and a mattress fixture. [Figure 16] FIG. 16(a) is a plan view showing a state where a part of a third coupling portion and a fourth coupling portion are joined, and FIG. 16(b) is a cross-sectional view of the mattress fixture in FIG. 16(a) viewed from the direction of arrow D-D. [Figure 17] It is a side view of a mattress fixture with a third coupling portion and a fourth coupling portion separated, viewed from the side.

Mode for Carrying Out the Invention

[0009] The mattress fixture and the laminated mattress according to the embodiment of the present invention will be described with reference to FIGS. 1 to 13.

[0010] FIGS. 1 and 2 show a mattress fixture and a laminated mattress according to a first embodiment of the present invention. FIG. 1 is a perspective view showing a laminated mattress using a mattress fixture according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a first mattress, a second mattress, and a mattress fixture. In addition, in FIG. 2, the cross-sectional dimensions of the mattress fixture are shown larger than the actual ones for the convenience of explanation. That is, the scale relationship between the mattress and the mattress fixture is different.

[0011] The laminated mattress 10 is fixed in a state where a plurality of mattresses are laminated by the mattress fixture 20. In this example, the case where two mattresses (the first mattress 12 and the second mattress 15) are laminated will be described.

[0012] The first mattress 12 and the second mattress 15 are different in hardness and thickness, for example. By laminating two mattresses, a comfortable sleeping feeling can be provided according to the user's preference. Note that three or more mattresses may be laminated.

[0013] The laminated mattress 10 includes the first mattress 12, the second mattress 15 located above the first mattress 12, and the mattress fixture 20 that fixes the first mattress 12 and the second mattress 15.

[0014] The mattress fixture 20 fixes the first mattress 12 and the second mattress 15 located above the first mattress 12. The mattress fixture 20 is, for example, a rectangular flat rubber that can be stretched and contracted in the longitudinal direction. The length of the mattress fixture 20 in the longitudinal direction is set corresponding to the number of laminated mattresses and the thickness of the mattresses.

[0015] The mattress fixture 20 has chemical resistance and heat resistance, for example. Thereby, in a state where the first mattress 12 and the second mattress 15 are fixed by the mattress fixture 20, the first mattress 12, the second mattress 15, and the mattress fixture 20 can be washed together.

[0016] The first mattress 12 and the second mattress 15 are fixed by a plurality of mattress fixtures 20. In this example, as shown in FIG. 1, the first mattress 12 and the second mattress 15 are fixed by eight mattress fixtures 20. And the mattress fixture 20 has a first coupling part 22, a second coupling part 24, and a connection part 26.

[0017] The first connecting part 22 is detachably attached to the lower surface 12a of the first mattress 12. As shown in Figure 2, the first connecting part 22 has a hook-and-loop fastener 22a that connects to the lower surface 12a of the first mattress 12. The lower surface 12a of the first mattress 12 is made of a material to which the hook-and-loop fastener 22a can be attached.

[0018] For example, the hook fastener 22a has a hook. On the other hand, the bottom surface 12a of the first mattress 12 has a loop function that the hook of the hook fastener 22a catches on. In this example, the entire back surface of the first connecting part 22 is connected to the bottom surface 12a of the first mattress 12 by the hook fastener 22a. However, the first connecting part 22 may have only a portion of its back surface connected to the bottom surface 12a of the first mattress 12 by the hook fastener 22a.

[0019] The second connecting part 24 is detachably attached to the upper surface 15a of the second mattress 15. As shown in Figure 2, the second connecting part 24 has a hook-and-loop fastener 24a that connects to the upper surface 15a of the second mattress 15. The upper surface 15a of the second mattress 15 is made of a material to which the hook-and-loop fastener 24a can be attached. In other words, the second connecting part 24 has the same configuration as the first connecting part 22.

[0020] The connecting portion 26 connects the first connecting portion 22 and the second connecting portion 24. The connecting portion 26 has elastic force between the first connecting portion 22 and the second connecting portion 24 and is expandable and contractible. The connecting portion 26 extends vertically along the side surface 12b of the first mattress 12 and the side surface 15b of the second mattress 15. In other words, the mattress fastener 20 is formed symmetrically in the longitudinal direction.

[0021] The mattress fastener 20 and laminated mattress 10 according to the first embodiment have the configuration described above. Next, the process of fastening the first mattress 12 and the second mattress 15 with the mattress fastener 20 will be described.

[0022] First, the second mattress 15 is placed on top of the first mattress 12. In this case, the first mattress 12 and the second mattress 15 are not provided with any connecting members such as hook-and-loop fasteners. Therefore, the second mattress 15 can be easily moved (slid) on top of the first mattress 12, and thus the second mattress 15 can be easily aligned on top of the first mattress 12.

[0023] Next, with the connection portion 26 and the second connecting portion 24 of the mattress fastener 20 extended toward the outside of the first mattress 12, the first connecting portion 22 is connected to the bottom surface 12a of the first mattress 12. Next, the connection portion 26 is extended by pulling the second connecting portion 24 of the mattress fastener 20. In this state, the second connecting portion 24 is connected to the top surface 15a of the second mattress 15. As a result, the mattress fastener 20 can secure the first mattress 12 and the second mattress 15 by sandwiching them between the first connecting portion 22, the connection portion 26, and the second connecting portion 24.

[0024] The mattress fastener 20 is attached to the first mattress 12 and the second mattress 15 so as to straddle the side surface 12b of the first mattress 12 and the side surface 15b of the second mattress 15. This reduces the shifting of the first mattress 12 and the second mattress 15. Furthermore, even when the laminated mattress 10 is placed on a bed (not shown) with a undulating bottom, for example, the shifting of the first mattress 12 and the second mattress 15 when the bottom undulates can be reduced.

[0025] To separate the first mattress 12 and the second mattress 15, the first connecting portion 22 is peeled off the lower surface 12a of the first mattress 12, and the second connecting portion 24 is peeled off the upper surface 15a of the second mattress 15. In this way, the laminated mattress 10 allows multiple mattresses to be easily fixed and separated using the mattress fasteners 20.

[0026] Here, for example, if mattress fasteners (e.g., hook-and-loop fasteners) are attached to the first and second mattresses by sewing or adhesive, there is a risk that the mattress fasteners will have to be removed from the first and second mattresses for sorting purposes. However, the mattress fasteners 20 are separated from the first mattress 12 and the second mattress 15. Therefore, the first and second mattresses 12 and 15 can be disposed of as they are. Furthermore, there is no need to sew or glue the mattress fasteners 20 to the first and second mattresses 12 and 15, making it easy to provide a laminated mattress 10.

[0027] Next, Figures 3 to 9 show a mattress fastener and a laminated mattress according to a second embodiment of the present invention. In the second embodiment, the same reference numerals are used for components identical to those in the mattress fastener and laminated mattress according to the first embodiment, and their descriptions are omitted.

[0028] Figure 3 is a perspective view showing a laminated mattress using a mattress fastener according to a second embodiment of the present invention. In Figure 3, one mattress fastener is shown detached from the mattress for ease of explanation. Figure 4 is a perspective view showing the mattress fastener as a standalone unit. Figure 5 is a cross-sectional view of the mattress fastener from the directions indicated by arrows AA, BB, and CC in Figure 4. Figure 5(a) is a cross-sectional view from the direction indicated by arrow AA in Figure 4. Figure 5(b) is a cross-sectional view from the direction indicated by arrow BB in Figure 4. Figure 5(c) is a cross-sectional view from the direction indicated by arrow CC in Figure 4. Figure 6 is a perspective view showing the second support part of the mattress fastener as a standalone unit. Figure 7 is an exploded view of the mattress fastener. Figure 8 is a cross-sectional view showing the process of securing the first mattress and the second mattress using mattress fasteners. Figure 9 is a cross-sectional view showing the case where the first mattress and the second mattress are fixed together by a mattress fastener.

[0029] The laminated mattress 30 comprises a first mattress 12, a second mattress 15, and a mattress fastener 40. The first mattress 12 has a hole 12c that penetrates in the vertical direction (thickness direction). On the other hand, the second mattress 15 has a hole 15c that penetrates in the vertical direction (thickness direction).

[0030] The holes 12c in the first mattress 12 and the holes 15c in the second mattress 15 are formed in corresponding positions. That is, when the first mattress 12 and the second mattress 15 are stacked, the holes 12c and 15c are aligned vertically. Mattress fasteners 40, which will be described later, are inserted through the holes 12c and 15c. When the mattress fasteners 40 are not inserted through the holes 12c and 15c, the cushioning properties of the first and second mattresses 12 and 15 close the holes 12c and 15c.

[0031] The mattress fastener 40 secures the first mattress 12 and the second mattress 15, which is located on top of the first mattress 12. The mattress fastener 40 is made of, for example, a resin material or a metal material.

[0032] The mattress fixing device 40 includes a first support portion 42 that supports the lower surface 12a of the first mattress 12, a second support portion 44 that supports the upper surface 15a of the second mattress 15, and an insertion portion 46 that is connected to the first support portion 42 and the second support portion 44 and inserted into the hole 12c of the first mattress 12 and the hole 15c of the second mattress 15. The insertion portion 46 has a cylindrical portion 47 that extends upward from the first support portion 42 and a shaft portion 48 that extends downward from the second support portion 44.

[0033] As shown in Figures 4 and 5, the first support portion 42 has a contact portion 42a that abuts against the lower surface 12a of the first mattress 12, and a through hole 42b that penetrates the contact portion 42a vertically (in the thickness direction) through its center. The contact portion 42a is formed, for example, in a disc shape, and its outer shape is larger than the hole 12c of the first mattress 12. The auxiliary tool 49, which will be described later, passes through the through hole 42b. In addition, a cylindrical portion 47, which will be described later, is provided around the through hole 42b.

[0034] As shown in Figures 4 to 7, the second support portion 44 has a contact portion 44a that abuts against the upper surface 15a of the second mattress 15, a threaded portion 44b that protrudes downward from the center of the contact portion 44a, and a projection 44c that protrudes downward from the contact portion 44a. The contact portion 44a is formed, for example, in a disc shape, and its outer shape is formed to be larger than the hole portion 15c of the second mattress 15.

[0035] The threaded portion 44b is provided on the lower surface of the contact portion 44a. As shown in Figure 6, a male thread 44b1 is provided on the outer surface of the threaded portion 44b. The threaded portion 44b is formed, for example, in a cylindrical shape, and a plurality of slits 44b2 are formed from the inner surface to the outer surface.

[0036] In this example, three slits 44b2 are provided spaced apart in the circumferential direction of the threaded portion 44b. The threaded portion 44b can be elastically deformed radially inward by the slits 44b2. The slits 44b2 may or may not be provided. The threaded portion 44b is screwed into the shaft portion 48, which will be described later. The second support portion 44 can be attached to the shaft portion 48 by pushing it into the internal thread 48a1 of the shaft portion 48 by the slits 44b2.

[0037] The projections 44c are provided on the lower surface of the contact portion 44a. In this example, four projections 44c are provided spaced apart in the circumferential direction of the contact portion 44a. The projections 44c catch on the upper surface 15a of the second mattress 15, thereby preventing the mattress fastener 40 from shifting. Alternatively, a projection corresponding to the projections 44c may be provided on the upper surface of the contact portion 42a of the first support portion 42.

[0038] The insertion portion 46 is located within the hole 12c of the first mattress 12 and within the hole 15c of the second mattress 15. The insertion portion 46 has a cylindrical portion 47 and a shaft portion 48 that is inserted into the cylindrical portion 47.

[0039] The cylindrical portion 47 extends upward from the contact portion 42a so as to surround the through hole 42b of the first support portion 42. The cylindrical portion 47 is formed integrally with the first support portion 42. The cylindrical portion 47 has an opening 47a located at the upper end into which the shaft portion 48 is inserted, and an engaging portion 47b located below the opening 47a into which the first and second claw portions 48b and 48c of the shaft portion 48 engage.

[0040] As shown in Figure 5(a), the opening 47a has an insertion opening 47a1 into which the main body portion 48a of the shaft portion 48 is inserted, and a guide opening 47a2 for guiding the first and second claw portions 48b and 48c of the shaft portion 48 toward the engagement portion 47b. The insertion opening 47a1 has a shape corresponding to the main body portion 48a of the shaft portion 48. In this example, the insertion opening 47a1 and the main body portion 48a of the shaft portion 48 are formed in a hexagonal shape.

[0041] The guide opening 47a2 extends radially outward from the insertion opening 47a1. The guide opening 47a2 is formed at positions corresponding to the first and second claw portions 48b and 48c of the shaft portion 48. In this example, guide openings 47a2 are formed on all sides of the hexagonal insertion opening 47a1. When the shaft portion 48 is inserted into the cylindrical portion 47, the guide opening 47a2 guides the first and second claw portions 48b and 48c toward the engagement portion 47b.

[0042] The engaging portion 47b is located below the guide opening 47a2. In this example, the cylindrical portion 47 has six engaging portions 47b. The engaging portions 47b extend vertically along the cylindrical portion 47. In this example, the engaging portions 47b penetrate between the inner and outer surfaces of the cylindrical portion 47. The engaging portions 47b restrict the upward movement of the first and second claw portions 48b, 48c. This determines the maximum distance between the first support portion 42 and the second support portion 44 of the mattress fastener 40.

[0043] The shaft portion 48 has a main body portion 48a extending in the vertical direction, and a first claw portion 48b and a second claw portion 48c projecting radially outward from the main body portion 48a. The main body portion 48a has a shape (hexagonal in this example) corresponding to the insertion opening 47a1 of the cylindrical portion 47. The main body portion 48a also has an internal thread 48a1 extending downward from its upper surface. The threaded portion 44b of the second support portion 44 is screwed into the internal thread 48a1.

[0044] The shaft portion 48 has multiple claw portions provided at different positions in the vertical direction. The claw portions are provided on the side surface of the main body portion 48a. In this example, there are two claw portions at different heights: a first claw portion 48b located at the lower end of the main body portion 48a, and a second claw portion 48c located above the first claw portion 48b. Note that the claw portions may be provided at only one height, or at three or more different heights.

[0045] Three first claws 48b and three second claws 48c are provided on the main body 48a. In other words, in this example, one claw is provided on each face of the hexagonal main body 48a. The first claws 48b and the second claws 48c may be arranged vertically on the same face of the main body 48a.

[0046] The upper ends of the first claw portion 48b and the second claw portion 48c abut against the upper end of the engaging portion 47b, thereby restricting the upward movement of the shaft portion 48. As shown in Figure 7, the height difference between the first claw portion 48b and the second claw portion 48c is ΔL. This allows the mattress fixing device 40 to accommodate multiple stacked mattresses 30 of different heights.

[0047] Specifically, when the thickness of the laminated mattress 30 is large, only the first claw portion 48b is engaged with the engaging portion 47b. On the other hand, when the thickness of the laminated mattress 30 is small, the second claw portion 48c is engaged with the engaging portion 47b. This allows the mattress fixing device 40 to adjust the dimension (height dimension) between the first support portion 42 and the second support portion 44.

[0048] The first and second claw portions 48b and 48c have inclined surfaces 48b1 and 48c1 such that the protrusion dimension from the main body portion 48a increases from the lower end to the upper end. This allows the opening 47a of the cylindrical portion 47 to be gradually widened when the shaft portion 48 is inserted into the cylindrical portion 47. Therefore, the shaft portion 48 can be smoothly inserted into the cylindrical portion 47. In addition, strong stress on the opening 47a of the cylindrical portion 47 can be suppressed.

[0049] The mattress fastener 40 and laminated mattress 30 according to the second embodiment have the configuration described above. Next, the process of fastening the first mattress 12 and the second mattress 15 with the mattress fastener 40 will be described. In this example, the case in which the second claw portion 48c is engaged with the engaging portion 47b will be described.

[0050] First, as shown in Figure 7, the shaft portion 48 is inserted into the cylindrical portion 47 through the opening 47a of the cylindrical portion 47. In this case, the shaft portion 48 and the cylindrical portion 47 are shaped such that when the shaft portion 48 is inserted into the cylindrical portion 47, the claw portions (first claw portion 48b and second claw portion 48c) engage with the engaging portion 47b.

[0051] For example, if the outer shape of the shaft portion and the inner shape of the cylindrical portion are formed in a circular shape, there is a risk that the shaft portion may be inserted into the cylindrical portion when the claw portion is disengaged from the engaging portion. Therefore, in this embodiment, the outer shape of the shaft portion 48 and the inner shape of the cylindrical portion 47 are formed in an angular shape. In this example, the outer shape of the shaft portion 48 and the inner shape of the cylindrical portion 47 are formed in a hexagon. This allows the claw portion to be positioned above the engaging portion 47b when the shaft portion 48 is inserted into the cylindrical portion 47.

[0052] The shapes of the shaft and cylinder are arbitrary as long as the claw portion can be engaged with the engagement portion. For example, the main body of the shaft may be circular, the insertion opening of the cylinder may be circular, and the guide opening into which the claw portion is inserted may protrude radially outward from the insertion opening. Also, projections or recesses for positioning may be formed on the shaft and cylinder.

[0053] As the shaft portion 48 is inserted into the cylindrical portion 47, the first claw portion 48b pushes the opening 47a radially outward, guiding it from the guide opening 47a2 to the engaging portion 47b. As the shaft portion 48 is further inserted into the cylindrical portion 47, the second claw portion 48c pushes the opening 47a radially outward, guiding it from the guide opening 47a2 to the engaging portion 47b. When the second claw portion 48c engages with the engaging portion 47b, the opening 47a returns radially inward due to elastic force. As a result, the upward movement of the shaft portion 48 is restricted because the upper surface of the second claw portion 48c abuts against the upper end of the engaging portion 47b.

[0054] Next, as shown in Figure 8, the shaft portion 48 and the cylindrical portion 47 are inserted into the hole portion 12c from the lower surface 12a of the first mattress 12. Then, the auxiliary tool 49 is inserted into the through hole 42b of the first support portion 42. This auxiliary tool 49 supports the shaft portion 48 from below when the second support portion 44 is fitted onto the shaft portion 48.

[0055] Then, with the shaft portion 48 supported from below by the auxiliary tool 49, the second support portion 44 is pushed into the female thread 48a1 of the shaft portion 48. In this case, a slit 44b2 is provided in the threaded portion 44b of the second support portion 44. As a result, the second support portion 44 can be easily attached to the shaft portion 48 by simply pushing it in without rotating it against the female thread 48a1 of the shaft portion 48.

[0056] On the other hand, the second support portion 44 can be removed from the shaft portion 48 by rotating it relative to the shaft portion 48. Note that the threaded portion 44b does not necessarily have to have a slit 44b2. In such cases, the second support portion 44 can be attached to the shaft portion 48 by rotating it relative to the shaft portion 48.

[0057] As shown in Figure 9, the mattress fixing device 40 is configured such that the first support portion 42 is pressed downward by the spring force of the first mattress 12, and the second support portion 44 is pressed upward by the spring force of the second mattress 15. As a result, the mattress fixing device 40 can fix the first mattress 12 and the second mattress 15 by sandwiching them between the first support portion 42 and the second support portion 44. When a user sits on the upper surface 15a of the second mattress 15, the shaft portion 48 slides downward within the cylindrical portion 47, following the deflection of the first mattress 12 and the second mattress 15.

[0058] Thus, the mattress fastener 40 and laminated mattress 30 according to the second embodiment can have the same functions and effects as those of the first embodiment. That is, the mattress fastener 40 can be removed and the first and second mattresses 12 and 15 can be discarded as is. Furthermore, there is no need to sew or glue the mattress fastener 40 to the first and second mattresses 12 and 15, and the laminated mattress 30 can be easily provided.

[0059] Furthermore, since the mattress fixing device 40 sandwiches the first and second mattresses 12 and 15 between the first support part 42 and the second support part 44, even when the laminated mattress 30 is placed on a bed with a base that can be raised or lowered, the shifting of the first mattress 12 and the second mattress 15 when the base is raised or lowered can be reduced.

[0060] Furthermore, the mattress fixing device 40 according to the second embodiment can accommodate laminated mattresses 30 of multiple thicknesses (heights) using multiple claw portions (first claw portion 48b, second claw portion 48c). Therefore, convenience can be improved and costs can be reduced.

[0061] Next, Figure 10 shows a mattress fastener and laminated mattress according to a third embodiment of the present invention. In the third embodiment, the same reference numerals are used for components identical to those in the first and second embodiments of the mattress fastener and laminated mattress, and their descriptions are omitted.

[0062] Figure 10 is an explanatory diagram showing a mattress fastener and a laminated mattress according to a third embodiment of the present invention. Figure 10(a) is an enlarged perspective view showing the mattress fastener with the first mattress and the second mattress fixed together. Figure 10(b) is a cross-sectional view of the mattress fastener. Figure 10(c) is a side view showing the mattress fastener in a rolled-up state.

[0063] The laminated mattress 50 comprises a first mattress 12, a second mattress 15, and a mattress fastener 60. The first mattress 12 has a hole 12c that penetrates in the vertical direction (thickness direction). On the other hand, the second mattress 15 has a hole 15c that penetrates in the vertical direction (thickness direction).

[0064] The mattress fastener 60 is, for example, a flat wrap-around band. The mattress fastener 60 has a metal plate 62 that is curved in the short direction and a covering portion 64 that covers the metal plate 62. The covering portion 64 is made of a resin material such as silicone. When the metal plate 62 of the mattress fastener 60 is bent, one end and the other end in the longitudinal direction wrap around each other and form a rounded shape.

[0065] The mattress fastener 60 includes an insertion portion 60a that is inserted through the hole 12c of the first mattress 12 and the hole 15c of the second mattress 15, a first extension portion 60b that extends upward from the lower end of the insertion portion 60a along the side surface 12b of the first mattress 12, and a second extension portion 60c that extends downward from the upper end of the insertion portion 60a along the side surface 15b of the second mattress 15.

[0066] Thus, the mattress fastener 60 and laminated mattress 50 according to the third embodiment can have the same functions and effects as the first embodiment. The mattress fastener 60 can maintain a flat state with the metal plate 62. This makes it easier to insert the mattress fastener 60 into the hole 12c of the first mattress 12 and the hole 15c of the second mattress 15.

[0067] Subsequently, when the mattress fastener 60 is bent, the first extension 60b and the second extension 60c overlap on the side 12b of the first mattress 12 or the side 15b of the second mattress 15. Therefore, the mattress fastener 60 can easily fasten the first mattress 12 and the second mattress 15 together.

[0068] The first and second mattresses 12 and 15 can be disposed of as is after removing the mattress fasteners 60. Furthermore, there is no need to sew or glue the mattress fasteners 60 to the first and second mattresses 12 and 15, making it easy to provide a laminated mattress 50. In this example, the mattress fasteners 60 were described as a wrap-around band having a metal plate 62. However, the embodiments of the present invention are not limited to this, and for example, the mattress fasteners 60 may be belts or bands made of polyurethane or polypropylene.

[0069] Next, Figure 11 shows a mattress fastener and laminated mattress according to a fourth embodiment of the present invention. In the fourth embodiment, the same reference numerals are used for components identical to those in the first and second embodiments of the mattress fastener and laminated mattress, and their descriptions are omitted. Figure 11 is a cross-sectional view showing a laminated mattress using a mattress fastener according to the fourth embodiment of the present invention.

[0070] The mattress fastener 72 according to the fourth embodiment is used in place of the mattress fastener 40 according to the second embodiment. The laminated mattress 70 comprises a first mattress 12, a second mattress 15, and the mattress fastener 72.

[0071] The mattress fixing device 72 includes a first support portion 74 that supports the lower surface 12a of the first mattress 12, a second support portion 76 that supports the upper surface 15a of the second mattress 15, and an insertion portion 78 that is connected to the first support portion 74 and the second support portion 76 and inserted into the hole 12c of the first mattress 12 and the hole 15c of the second mattress 15.

[0072] The mattress fastener 72 is made of a resin material such as silicone rubber, and has a first support portion 74, a second support portion 76, and an insertion portion 78 integrally formed. When attaching the mattress fastener 72 to the first and second mattresses 12 and 15, for example, with the first support portion 74 folded, the first support portion 74 and the insertion portion 78 are inserted into the hole 15c of the second mattress 15 and the hole 12c of the first mattress 12. As a result, as shown in Figure 11, the mattress fastener 72 can secure the first and second mattresses 12 and 15 by sandwiching them between the first support portion 74 and the second support portion 76.

[0073] Thus, the mattress fastener 72 and laminated mattress 70 according to the fourth embodiment can have the same functions and effects as those of the first embodiment. The first and second mattresses 12 and 15 can be discarded as is after removing the mattress fastener 72. Furthermore, there is no need to sew or glue the mattress fastener 72 to the first and second mattresses 12 and 15, making it easy to provide a laminated mattress 70.

[0074] Figure 12 is a perspective view showing a laminated mattress using a mattress fixing device according to the first modified example of the present invention. In the first embodiment described above, the mattress fastener 20 is a rectangular flat rubber that is stretchable in the longitudinal direction, and the case in which the first and second mattresses 12 and 15 are fixed with multiple mattress fasteners 20 was described as an example. However, the embodiments of the present invention are not limited to this, and for example, as shown in the first modified example in Figure 12, there may also be a mattress fastener 80 in which multiple mattress fasteners 20 are connected by connecting parts 82.

[0075] The connecting portion 82 is, for example, a flat rubber band formed in an annular shape, and extends between the opposing sides 12b and 15b of the first and second mattresses 12 and 15. In this example, the connecting portion 82 extends along the shorter side of the first and second mattresses 12 and 15. A mattress fastener 20 is connected to a portion of the connecting portion 82. This allows the mattress fastener 80 to securely fasten the first and second mattresses 12 and 15. The connecting portion 82 may also extend along the longer side of the first and second mattresses 12 and 15.

[0076] Figure 13 is a front view showing the shaft portion of a mattress fixing device according to a second modified example of the present invention. In the second embodiment described above, the case in which the inclined surface 48b1 of the first claw portion 48b and the inclined surface 48c1 of the second claw portion 48c have the same shape was explained as an example. However, the embodiments of the present invention are not limited to this, and for example, as shown in the second modified example in Figure 13, the inclined surface 92a of the second claw portion 92 may have a gentler inclination angle than the inclined surface 90a of the first claw portion 90. This allows the opening 47a to be gradually widened when engaging the second claw portion 92 with the engaging portion 47b. Therefore, the second claw portion 92 can be smoothly engaged with the engaging portion 47b.

[0077] Next, Figures 14 to 17 show mattress fasteners according to a third modification of the present invention. Mattress fasteners 100, 105, and 108 according to the third modification are the mattress fastener 20 according to the first embodiment, with the addition of a third connecting part 102 and a fourth connecting part 104. In the third modification, the same reference numerals are used for the same components as in the mattress fastener 20 and laminated mattress 10 according to the first embodiment, and their descriptions are omitted.

[0078] Figure 14 is a perspective view showing a mattress fixing device according to a third modified example of the present invention. Figure 15 is a cross-sectional view similar to Figure 2, showing the first mattress, the second mattress, and the mattress fasteners.

[0079] The mattress fastener 100 further comprises a third joint 102 and a fourth joint 104, in addition to the first joint 22, the second joint 24, and the connecting part 26. The third joint 102 and the fourth joint 104 extend from the connecting part 26 and are located between the first mattress 12 and the second mattress 15. The third joint 102 and the fourth joint 104 are hook-and-loop fasteners.

[0080] As shown in Figures 14 and 15, the third connecting portion 102 is located in the longitudinal center of the connecting portion 26 and extends from the connecting portion 26. The third connecting portion 102 extends from the back surface of the connecting portion 26 where the hook fasteners 22a and 24a are provided.

[0081] The third connecting portion 102 is detachably attached to the upper surface 12d of the first mattress 12. As shown in Figure 15, the third connecting portion 102 has a hook on the contact surface 102a that contacts the upper surface 12d of the first mattress 12, and is capable of being attached to the upper surface 12d of the first mattress 12. The upper surface 12d of the first mattress 12 is made of a material to which the third connecting portion 102 can be attached. In other words, the first mattress 12 is sandwiched in the thickness direction by the first connecting portion 22 and the third connecting portion 102.

[0082] As shown in Figures 14 and 15, the fourth joint 104 is located in the longitudinal center of the connecting portion 26 and extends from the connecting portion 26. The fourth joint 104 extends from the back surface of the connecting portion 26 where the hook fasteners 22a and 24a are provided. The fourth joint 104 is located on the back surface 102b side of the third joint 102. In other words, the third joint 102 and the fourth joint 104 are provided side by side in the longitudinal direction of the connecting portion 26.

[0083] The fourth connecting portion 104 is detachably attached to the lower surface 15d of the second mattress 15. As shown in Figure 15, the fourth connecting portion 104 has a hook on the contact surface 104a that contacts the lower surface 15d of the second mattress 15, and is capable of being attached to the lower surface 15d of the second mattress 15. The lower surface 15d of the second mattress 15 is made of a material to which the fourth connecting portion 104 can be attached. In other words, the second mattress 15 is sandwiched in the thickness direction by the second connecting portion 24 and the fourth connecting portion 104.

[0084] The third joint 102 and the fourth joint 104 are integrally formed. The back surface 102b of the third joint 102 and the back surface 104b of the fourth joint 104 are joined, for example, by adhesive or sewing. That is, the back surface 102b of the third joint 102 and the back surface 104b of the fourth joint 104 are not exposed. Because the third joint 102 and the fourth joint 104 are integrally formed, this integral object has hooks for hook-and-loop fasteners on both the front and back surfaces. The third joint 102 and the fourth joint 104 may also be integrally formed by sewing or bonding the outer circumference, for example. As a result, the mattress fastener 100 can fix the first mattress 12 and the second mattress 15 more integrally. Therefore, the mattress fastener 100 can suppress layer misalignment between the first mattress 12 and the second mattress 15. Furthermore, the mattress fastener 100 can improve the strength of the third joint 102 and the fourth joint 104.

[0085] Furthermore, as shown in Figure 16, the mattress fastener 105 may be separated at least in part from the third joint 102 and the fourth joint 104. In other words, as shown in Figure 16, the third joint 102 and the fourth joint 104 may be joined at least in part by adhesive, sewing, or other means. Figure 16(a) is a plan view showing the state in which the third joint and the fourth joint are joined together, and Figure 16(b) is a cross-sectional view of the mattress fastener in Figure 16(a) as seen from the direction indicated by arrow DD.

[0086] As shown in Figure 16, the third joint 102 and the fourth joint 104 may have a joint 106 formed by sewing or adhesive at, for example, the central part in the short direction of the connecting part 26. As shown in Figure 16(b), the joint 106 extends vertically between, for example, the third joint 102 and the fourth joint 104. As a result, the mattress fastener 105 can be made stronger because the third joint 102 and the fourth joint 104 are partially integrated. In addition, the mattress fastener 105 can reduce the transmission of displacement of one mattress to the other mattress at the point where the third joint 102 and the fourth joint 104 are separated.

[0087] Furthermore, as shown in Figure 17, the mattress fastener 108 does not necessarily have to be joined to the third joint 102 and the fourth joint 104. Figure 17 is a side view of the mattress fastener with the third and fourth connecting parts separated.

[0088] As shown in Figure 17, the mattress fastener 108 has a third connecting portion 102 and a fourth connecting portion 104 that are separated (not joined). That is, the third connecting portion 102 and the fourth connecting portion 104 are joined only to the connecting portion 26. In other words, the back surface 102b of the third connecting portion 102 and the back surface 104b of the fourth connecting portion 104 are exposed.

[0089] The mattress fasteners 105 and 108 have at least a portion of the third joint 102 and the fourth joint 104 separated. This allows one mattress to slide even if it shifts, as it slides along the unjointed portion between the third joint 102 and the fourth joint 104, thus reducing the transmission of that shift to the other mattress.

[0090] Thus, the mattress fasteners 100, 105, and 108 according to the third modified example can have the same functions and effects as those of the first embodiment. The first and second mattresses 12 and 15 can be discarded as is after removing the mattress fasteners 100, 105, and 108. Furthermore, there is no need to sew or glue the mattress fasteners 100, 105, and 108 to the first and second mattresses 12 and 15, making it easy to provide a laminated mattress 110.

[0091] Furthermore, the mattress fasteners 100, 105, and 108, with their third and fourth connecting parts 102 and 104, can more integrally secure the first and second mattresses 12 and 15. In addition, since the third and fourth connecting parts 102 and 104 of the mattress fasteners 100, 105, and 108 are located between the first and second mattresses 12 and 15, the likelihood of them coming loose from the first and second mattresses 12 and 15 can be reduced.

[0092] In the third modified example described above, a mattress fastener 100 provided with both the third connecting portion 102 and the fourth connecting portion 104 was used as an example. However, the embodiments of the present invention are not limited to this, and a mattress fastener provided with at least one of the third connecting portion 102 or the fourth connecting portion 104 may also be used.

[0093] Examples of mattress fasteners and laminated mattresses based on the embodiments described above include those described below.

[0094] A first embodiment is a mattress fastener for fixing a first mattress and a second mattress positioned on the first mattress, comprising: a first connecting portion detachably attached to the lower surface of the first mattress; a second connecting portion detachably attached to the upper surface of the second mattress; and a connecting portion extending vertically along the side surface of the first mattress and the side surface of the second mattress, connecting the first connecting portion and the second connecting portion.

[0095] A second embodiment of the mattress fastener is characterized in that, in the first embodiment, it further comprises a third connecting portion extending from the connecting portion and located between the first mattress and the second mattress, wherein the third connecting portion is detachably attached to the upper surface of the first mattress.

[0096] A third embodiment is a mattress fastener characterized in that, in the first or second embodiment, it further comprises a fourth connecting portion extending from the connecting portion and located between the first mattress and the second mattress, wherein the fourth connecting portion is detachably attached to the underside of the second mattress.

[0097] A fourth aspect of the mattress fastener is characterized in that, in the first aspect, it further comprises a third joint and a fourth joint extending from the connecting portion and located between the first mattress and the second mattress, wherein the third joint is detachably attached to the upper surface of the first mattress, and the fourth joint is detachably attached to the lower surface of the second mattress, and the third joint and the fourth joint are integrally formed as a whole.

[0098] A fifth aspect of the mattress fastener is characterized in that, in the first aspect, it further comprises a third joint and a fourth joint extending from the connecting portion and located between the first mattress and the second mattress, wherein the third joint is detachably attached to the upper surface of the first mattress, and the fourth joint is detachably attached to the lower surface of the second mattress, and the third joint and the fourth joint are separated by at least a portion.

[0099] A sixth aspect is a mattress fastener for fixing a first mattress and a second mattress positioned on the first mattress, comprising: a first support portion for supporting the lower surface of the first mattress; a second support portion for supporting the upper surface of the second mattress; and an insertion portion connected to the first support portion and the second support portion and inserted into a hole in the first mattress and a hole in the second mattress.

[0100] A seventh aspect is a mattress fastener characterized in that, in the sixth aspect, the insertion portion has a cylindrical portion extending upward from the first support portion and a shaft portion extending downward from the second support portion and inserted into the cylindrical portion.

[0101] An eighth aspect is a mattress fastener characterized in that, in the seventh aspect, the shaft portion has a plurality of claw portions provided at different positions in the vertical direction, and the cylindrical portion has engaging portions into which the claw portions engage.

[0102] A ninth aspect is a mattress fastener characterized in that, in the eighth aspect, the shaft portion and the cylindrical portion are shaped such that when the shaft portion is inserted into the cylindrical portion, the claw portion engages with the engaging portion.

[0103] A tenth aspect is a mattress fastener for fixing a first mattress and a second mattress positioned on the first mattress, characterized by comprising: an insertion portion inserted through a hole in the first mattress and a hole in the second mattress; a first extension portion extending upward from the lower end of the insertion portion along the side surface of the first mattress; and a second extension portion extending downward from the upper end of the insertion portion along the side surface of the second mattress.

[0104] An eleventh aspect is a laminated mattress comprising a first mattress, a second mattress positioned on the first mattress, and a mattress fastener for fixing the first mattress and the second mattress, wherein the mattress fastener has a first connecting portion detachably attached to the lower surface of the first mattress, a second connecting portion detachably attached to the upper surface of the second mattress, and a connecting portion extending vertically along the side surface of the first mattress and the side surface of the second mattress, connecting the first connecting portion and the second connecting portion.

[0105] A twelfth embodiment is a laminated mattress comprising: a first mattress having a hole that penetrates vertically; a second mattress positioned above the first mattress and having a hole that penetrates vertically at a position corresponding to the hole in the first mattress; and a mattress fastener for fixing the first mattress and the second mattress, wherein the mattress fastener comprises: a first support portion that supports the lower surface of the first mattress; a second support portion that supports the upper surface of the second mattress; and an insertion portion connected to the first support portion and the second support portion and inserted through the hole in the first mattress and the hole in the second mattress.

[0106] A thirteenth embodiment is a laminated mattress comprising: a first mattress having a hole that penetrates vertically; a second mattress positioned above the first mattress and having a hole that penetrates vertically at a position corresponding to the hole in the first mattress; and a mattress fastener for fixing the first mattress and the second mattress, wherein the mattress fastener has a through portion that is inserted through the hole in the first mattress and the hole in the second mattress; a first extension portion that extends upward from the lower end of the through portion along the side surface of the first mattress; and a second extension portion that extends downward from the upper end of the through portion along the side surface of the second mattress.

[0107] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of Symbols]

[0108] 10-layer mattress 12 First Mattress 15. Second Mattress 12a Bottom side 15a Top side 12b, 15b side 12c, 15c hole 12d top surface 15d Bottom 20 Mattress fasteners 22 1st joint 24 Second joint 22a, 24a Folding fasteners 26 Connection part 30-layer mattress 40 Mattress fasteners 42 1st support part 42a Contact part 42b Through hole 44 Second support part 44a Contact part 44b Threaded section 44b1 male thread 44b2 Slit 44c protrusion 46 Insertion part 47 Cylinder part 47a opening 47a1 Insertion opening 47a2 Guide opening 47b Engaging part 48 Shaft section 48a Main body 48a1 Female thread 48b First claw portion 48c 2nd claw part 48b1, 48c1 Slope 49 Assistive devices 50-layer mattress 60 Mattress fasteners 60a Insertion section 60b 1st extension part 60c 2nd extension 62 Metal plate 64 Covering part 70-layer mattress 72 Mattress fasteners 74 1st support part 76 Second support part 78 Insertion part 80 Mattress fasteners 82 Connection part 90 1st claw part 92 2nd claw part 90a, 92a Slope 100 Mattress fasteners 102 Third joint 102a Contact surface 102b Reverse side 104 4th joint 104a Contact surface 104b Reverse side 105 Mattress fasteners 106 Joint 108 Mattress fasteners 110 Laminated Mattress

Claims

1. A mattress fixing device for fixing a first mattress and a second mattress located on top of the first mattress, A first connecting part that can be attached to the underside of the first mattress, A second connecting part that can be attached to the upper surface of the second mattress, A connecting portion extending vertically along the side surface of the first mattress and the side surface of the second mattress, connecting the first connecting portion and the second connecting portion, Equipped with, A third connecting portion extending from the aforementioned connecting portion and located between the first mattress and the second mattress, A fourth connecting portion extending from the aforementioned connecting portion and located between the first mattress and the second mattress, Furthermore, The third connecting part is detachably attached to the upper surface of the first mattress. The mattress fastener is characterized in that the fourth connecting portion is detachably attached to the underside of the second mattress.

2. First mattress and A second mattress located on top of the first mattress, A mattress fastener for securing the first mattress and the second mattress, A laminated mattress comprising, The aforementioned mattress fastener is A first connecting part that can be attached to the underside of the first mattress, A second connecting part that can be attached to the upper surface of the second mattress, A connecting portion extending vertically along the side surface of the first mattress and the side surface of the second mattress, connecting the first connecting portion and the second connecting portion, It has, A third connecting portion extending from the aforementioned connecting portion and located between the first mattress and the second mattress, A fourth connecting portion extending from the aforementioned connecting portion and located between the first mattress and the second mattress, Furthermore, The third connecting part is detachably attached to the upper surface of the first mattress. The laminated mattress is characterized in that the fourth connecting portion is detachably attached to the lower surface of the second mattress.

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