Sheet for mattress

Abstract

Provided is a sheet for a mattress, the sheet being capable of easily releasing heat that has accumulated in the mattress while being fixed to the mattress. A sheet (1) for a mattress (100) comprises: a first direction and a second direction that extend in a planar direction and are orthogonal to each other; a thickness direction (T) that is orthogonal to the planar direction; a body part (20) that is disposed on at least an upper surface of the mattress; a pair of first fixing parts (51) for fixing both first-direction end parts (21) of the body part to the mattress; and a pair of second fixing parts (52) for fixing both second-direction end parts (22) of the body part to the mattress. A fixing-part-to-fixing-part peripheral edge (25C) on the peripheral edge (25) of the body part, said fixing-part-to-fixing-part peripheral edge (25C) extending in the first direction between the first fixing parts and the second fixing parts, has an inner peripheral edge part (25r) that is positioned farther inward in the second direction than at least one of outer edges (51e2) of the first fixing parts in the second direction or outer edges (51e2) of the second fixing parts in the second direction.

Description

Sheet for mattress

[0001] The present invention relates to a sheet for a mattress.

[0002] Conventionally, a sheet for a mattress in which an opening for inserting and removing a mattress is formed on one side of a box-shaped fabric has been widely known (for example, see Patent Document 1). By inserting the mattress the mattress into the sheet through the opening, the mattress can be covered with the sheet. Since the end of the sheet (specifically, the outer peripheral edge of the sheet constituting the opening) can be disposed on the lower surface of the mattress, it becomes difficult for the sheet to shift from the mattress due to the weight of the mattress, and it is possible to suppress the sheet from getting wrinkled.

[0003] Japanese Patent Application Laid-Open No. 2017-99591

[0004] However, the above-described sheet for a mattress had room for improvement in the following points.

[0005] When the body temperature of the user transfers to the mattress, heat tends to be trapped in the mattress. In particular, users who cannot freely turn over (for example, the elderly, infants, etc.) are difficult to release heat from the upper surface of the mattress by staying in the same place on the mattress. As a result, heat is trapped in the user's body, and the sleep quality may deteriorate or the sleep may become shallow. Also, when the user is an infant, there is a concern about unexpected physical discomfort due to high body temperature (so-called heat stroke).

[0006] The present invention has been made in view of such problems, and provides a sheet for a mattress that can easily release the heat trapped in the mattress while being fixed to the mattress.

[0007] A mattress sheet according to one embodiment comprises a main body portion that extends in a planar direction and is perpendicular to each other in a first and second direction, a thickness direction perpendicular to the planar direction, and is disposed on at least the upper surface of the mattress; a pair of first fixing portions for fixing both ends of the main body portion in the first direction to the mattress; and a pair of second fixing portions for fixing both ends of the main body portion in the second direction to the mattress. The inter-fixing periphery of the main body portion that extends in the first direction between the first fixing portion and the second fixing portion has an inner periphery portion that is located inward in the second direction from at least one of the outer edge of the first fixing portion in the second direction and the outer edge of the second fixing portion in the second direction.

[0008] Figure 1 is a perspective view of the bedding according to the embodiment. Figure 2 is a plan view of the mattress sheet according to the embodiment in an extended state. Figure 3 is a schematic enlarged part of the sheet according to the embodiment in Figure 2. Figure 4 is a schematic cross-sectional view of the bedding in Figure 1. Figure 5 is a schematic cross-sectional view of the bedding in Figure 1. Figure 6 is a plan view of the sheet according to the first modification example in an extended state. Figure 7 is a cross-sectional view of the bedding when the sheet according to the first modification example is attached to the mattress. Figure 8 is a plan view of the sheet according to the second modification example in an extended state.

[0009] (1) Outline of the Embodiments The following matters will become clear from the description in this specification and the accompanying drawings.

[0010] The invention according to Embodiment 1 comprises a main body portion disposed on at least the upper surface of the mattress, a thickness direction perpendicular to the plane direction, a first and second direction extending in a planar direction and mutually orthogonal to each other, a pair of first fixing portions for fixing both ends of the main body portion in the first direction to the mattress, and a pair of second fixing portions for fixing both ends of the main body portion in the second direction to the mattress. The inter-fixing periphery of the main body portion that extends in the first direction between the first fixing portion and the second fixing portion has an inner periphery portion that is located inward in the second direction from at least one of the outer edge of the first fixing portion in the second direction and the outer edge of the second fixing portion in the second direction. According to this embodiment, the end of the main body portion in the first direction can be fixed to the mattress by the first fixing portion, and the end of the main body portion in the second direction can be fixed to the mattress by the second fixing portion. This makes it possible to fix the main body portion of the sheet to the mattress on both the first and second directions, suppressing slippage between the sheet and the mattress and suppressing wrinkles in the main body portion.

[0011] The outer edge of the area covered by the main body is defined by the periphery of the main body. The inter-fixing periphery, located between the first and second fixing parts, is located inward in the second direction from at least one of the outer edges of the first and second fixing parts. Because the inner periphery of the inter-fixing periphery is located beyond the outermost edge in the second direction of the position where the main body is fixed by the fixing parts (the outer edge of the first and second fixing parts that is located outside in the second direction), a portion of the periphery of the main body extending in the first direction is located inward in the second direction from the position where the main body is fixed to the mattress, and the main body does not cover the mattress outside the inner periphery in the second direction. Because at least one of the outer edges of the first and second fixing parts is located outside the inner periphery in the second direction, the inner periphery that does not cover the mattress can be fixed at a position outside that position in the second direction, thereby suppressing displacement while positioning the inner periphery. Therefore, areas of the mattress not covered by the main body (hereinafter referred to as "exposed areas") can be secured, improving breathability. As a result, heat stored in the mattress can be released more easily in the exposed areas compared to the areas covered by the main body.

[0012] In a preferred embodiment, the invention according to embodiment 2 is such that, in the invention according to embodiment 1, in the second direction, the outer edge of the first fixing part is located inward from the outer edge of the second fixing part. According to this embodiment, in the second direction, the outer edge of the first fixing part is located inward from the outer edge of the second fixing part, thereby providing a wider area outside the first fixing part, i.e., an area where the mattress and the main body are not fixed by the first fixing part. As a result, in this area, the mattress and the main body are not in close contact, making it easier for the heat stored in the mattress to escape.

[0013] In a preferred embodiment, the invention according to embodiment 3 is such that, in the invention according to embodiment 1 or embodiment 2, the length of the main body in the second direction is shorter than the length of the main body in the first direction. According to this embodiment, because the length of the main body in the second direction is shorter, the user is closer to the inner peripheral edge located inside in the second direction. That is, the distance between the user and the exposed area is reduced, making it easier for the heat stored in the mattress, transferred from the user's body temperature, to escape from the exposed area.

[0014] In a preferred embodiment, the invention according to embodiment 4 is the invention according to embodiment 3, wherein the total length of the second fixing portion in the first direction is shorter than the total length of the first fixing portion in the second direction. According to this embodiment, by shortening the total length of the second fixing portion that fixes the end of the main body in the second direction, the proportion of the main body and the mattress in close contact by the second fixing portion at the end of the main body in the second direction, which is closer to the user, can be reduced. As a result, the heat stored in the mattress can be released more easily.

[0015] In a preferred embodiment, the invention according to embodiment 5 is the invention according to any one of embodiments 1 to 4, wherein in the first direction, the length of the inner peripheral edge is longer than the total length of the second fixing portion. According to this embodiment, the region outside the inner peripheral edge in the second direction becomes an exposed region. Therefore, a longer exposed region can be secured compared to the second fixing portion, making it easier to dissipate heat from the mattress.

[0016] In a preferred embodiment, the invention according to embodiment 6 is the invention according to any one of embodiments 1 to 5, wherein the sheet has a side region that is positioned on the side of the mattress. At least one of the first fixing part and the second fixing part is located in the side region. According to this embodiment, the first fixing part and / or the second fixing part located in the side region are positioned on the side of the mattress when the sheet is attached to the mattress. Compared to when the fixing part is located on the top surface of the mattress, the user lying on the mattress is less likely to come into contact with the fixing part, making it easier to sleep comfortably. Also, compared to when it is located on the bottom surface of the mattress, the fixing part is easier to see and reach without, for example, lifting the mattress, making it easier to remove the sheet from the mattress.

[0017] In a preferred embodiment, the invention according to embodiment 7 is the invention according to any one of embodiments 1 to 6, wherein the sheet has a bottom surface area that is positioned on the underside of the mattress, and at least one of the first fixing part and the second fixing part is located in the bottom surface area. According to this embodiment, the first fixing part and / or the second fixing part located in the bottom surface area are located on the underside of the mattress when the sheet is attached to the mattress. Compared to when the fixing part is located on the top surface of the mattress, the user lying on the mattress does not come into contact with the fixing part, making it easier to sleep comfortably. Due to the weight of the mattress, the fixing part and the mattress are in close contact, making it difficult for the fixing part to come off and further preventing the sheet from shifting away from the mattress.

[0018] In a preferred embodiment, the invention according to embodiment 8 is the invention according to any one of embodiments 1 to 7, wherein at least one of the first fixing part and the second fixing part extends continuously in the planar direction. According to this embodiment, the sheet can be fixed linearly rather than point-wise by the first fixing part and / or second fixing part that extends continuously in the planar direction, making it even more difficult for the sheet to slip off the mattress.

[0019] In a preferred embodiment, the invention according to embodiment 9 is the invention according to any of embodiments 1 to 8, wherein at least one of the first fixing part and the second fixing part is provided at one end of the sheet at discontinuous intervals. According to this embodiment, since the sheet can be fixed to the mattress at multiple points, the sheet becomes less likely to slip off the mattress. Between the first fixing parts and / or between the second fixing parts, the sheet is not fixed to the mattress, making it easier to ensure breathability.

[0020] In a preferred embodiment, the invention according to embodiment 10 is the invention according to embodiment 9, wherein the second fixing portion is provided at a plurality of discontinuous intervals at one end of the sheet in the second direction, and the second inter-fixing periphery of the main body portion that extends in the first direction between the plurality of second fixing portions has a central inner periphery portion that is located inward in the second direction from the outer edge of the second fixing portion. According to this embodiment, an exposed area exists outside in the second direction from the central inner periphery portion located between the plurality of second fixing portions. As a result, heat stored in the mattress can be released more easily in the exposed area compared to the part covered by the main body portion.

[0021] In a preferred embodiment, the invention according to embodiment 11 is the invention according to any of embodiments 1 to 10 in which the inner peripheral edge extends in a non-linear manner. According to this embodiment, compared to the case in which the inner peripheral edge, which is part of the periphery of the main body, extends in a linear manner, the length of the inner peripheral edge increases the contact area between the mattress and the periphery of the main body, making it even more difficult for the main body to slip away from the mattress.

[0022] In a preferred embodiment, the invention according to embodiment 12 further comprises an extension portion extending outward in the second direction from the inner peripheral edge portion in the invention according to any of embodiments 1 to 11, wherein the breathability of the extension portion is higher than that of the main body portion. According to this embodiment, in the area of ​​the mattress where the extension portion is located, breathability is ensured while the mattress is not directly exposed, thus preventing the mattress from becoming soiled.

[0023] (2) Mattress Sheet According to the Embodiment The mattress sheet according to the embodiment will be described below with reference to the drawings. In the following drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and the ratios of the dimensions etc. may differ from those of reality. Therefore, specific dimensions etc. should be determined by referring to the following explanation. In addition, there may be parts where the relationships and ratios of dimensions differ between drawings.

[0024] Figure 1 is a perspective view of bedding 1 according to an embodiment. In Figure 1, the sheet 10 is attached to the mattress 100. Figure 2 is a plan view of the sheet 10 for the mattress 100 in an extended state. In this invention, the extended state may be a state in which the sheet 10 is stretched to a state in which no wrinkles are formed, when the sheet 10 is not attached to the mattress 100. Figure 3 is a schematic enlarged part of the sheet 10 in Figure 2. Figure 4 is a schematic cross-sectional view of the bedding 1 in Figure 1. Figure 4A is a schematic cross-sectional view along the line F4A-F4A in Figure 1. Figure 4B is a schematic cross-sectional view along the line F4B-F4B in Figure 1. Figure 4C is a schematic cross-sectional view along the line F4C-F4C in Figure 1. Note that in Figure 4, for clarity, an exploded view is shown with the mattress 100 and the sheet 10 separated. Figure 5 is a schematic cross-sectional view of the bedding 1 in Figure 1, and is a schematic cross-sectional view along the line F5-F5 in Figure 1.

[0025] The bedding 1 according to this embodiment includes a mattress 100 and a sheet 10 for the mattress 100. The mattress 100 is used by being placed under the user when the user sleeps. The mattress 100 may be called, for example, a futon. The mattress 100 may be for general use or for users who cannot freely turn over in their sleep. For example, the mattress 100 may be a mattress for the elderly or a mattress for infants and / or children.

[0026] The sheet 10 has a first and second direction that extend in a planar direction and are mutually perpendicular, and a thickness direction T that is perpendicular to the planar direction. As shown in Figure 1, in this embodiment, the first direction coincides with the front-to-back direction L of the mattress 100, and the second direction coincides with the width direction W of the mattress 100. The front-to-back direction L may be the axial direction of the user's body (head to feet / feet to head) when the user lies on the mattress 100. The width direction W may be the left-to-right direction of the user when the user lies on the mattress 100. As shown in Figure 1, the length of the front-to-back direction L of the mattress 100 may be longer than the length of the width direction W of the mattress 100.

[0027] In other embodiments, the first direction may coincide with the width direction W of the mattress 100, and the second direction may coincide with the front-to-back direction L of the mattress 100. In the following explanation, we will proceed assuming that the first direction coincides with the front-to-back direction L and the second direction coincides with the width direction W.

[0028] The thickness direction T may be the thickness direction of the mattress 100 if the sheet 10 is attached to the mattress 100, as shown in Figure 1. The thickness direction T may be the thickness direction of the sheet 10 if the sheet 10 is not attached to the mattress 100. The thickness direction T may extend from the side facing the user sleeping on the mattress 100 to the side facing the mattress 100.

[0029] As shown in Figure 2, the sheet 10 in its extended state may have a shape other than rectangular in a plan view. In this embodiment, the sheet 10 in its extended state is approximately hexagonal in a plan view. The sheet 10 in its extended state is a sheet-like type that extends in a planar direction from the center of the sheet 10 to the outer edge of the sheet 10 in a plan view, and is not a box-type sheet formed in a bag shape. The sheet 10 has at least an upper surface region UR that is placed on the upper surface 100u of the mattress 100. In addition to the upper surface region UR, the sheet 10 may have a side surface region SR that is placed on the side surface 100s of the mattress 100. The sheet 10 according to this embodiment has an upper surface region UR and a side surface region SR. The side surface region SR may have a first side surface region SR1 located in the front-rear direction L (first direction) and a second side surface region SR2 located in the width direction W (second direction). Therefore, in the front-to-back direction L, the first side region SR1 is positioned so as to sandwich the upper surface region UR. In the width direction W, the second side region SR2 is positioned so as to sandwich the upper surface region UR. The first side region SR1 is located on the side 100s of the mattress 100 in the front-to-back direction L. The second side region SR2 is located on the side 100s of the mattress 100 in the width direction W.

[0030] The sheet 10 may include a main body portion 20 positioned on at least the upper surface 100u of the mattress 100, and fixing portions 50 for fixing the ends of the main body portion 20 to the mattress 100. The fixing portions 50 may include a pair of first fixing portions 51 for fixing both ends of the main body portion 20 in a first direction (first end portions 21) to the mattress 100, and a pair of second fixing portions 52 for fixing both ends of the main body portion 20 in a second direction (second end portions 22) to the mattress 100. Thus, the sheet 10 includes a pair of first fixing portions 51 and a pair of second fixing portions 52.

[0031] The main body portion 20 is sheet-like and extends in a planar direction. The main body portion 20 may be a woven fabric made of, for example, cotton, synthetic fibers, etc. When the sheet 10 is attached to the mattress 100, the main body portion 20 covers at least the upper surface 100u of the mattress 100. The main body portion 20 may cover at least the central portion of the mattress 100 in the front-to-back direction L and the width direction W. The central portion of the mattress 100 may be, for example, the central region when the mattress 100 is divided into three equal parts in the front-to-back direction L when viewed from above, and the central region when the mattress 100 is divided into three equal parts in the width direction W.

[0032] In this embodiment, as shown in Figures 1 and 4, the main body 20 covers the top surface 100u and the side surface 100s when the sheet 10 is attached to the mattress 100. In other embodiments, the main body 20 may be placed only on the top surface 100u and not on the side surface 100s (and the bottom surface 100b of the mattress 100). The main body 20 does not need to cover the entire top surface 100u, and may cover only a part of the top surface 100u. If the main body 20 is also placed on the side surface 100s, it may cover only a part of the side surface 100s.

[0033] The main body portion 20 has two ends (hereinafter referred to as a pair of first ends) 21 in a first direction (front-to-back direction L), two ends (hereinafter referred to as a pair of second ends) 22 in a second direction (width direction W), and a central portion 23. The ends of the main body portion 20 are portions that occupy a certain range including the edges of the main body portion 20. In a plan view of the sheet 10 in its extended state, the central portion 23 is located between the pair of first ends 21 in the first direction and between the pair of second ends 22 in the second direction. For example, in a plan view of the sheet 10 in its extended state, in the front-to-back direction L, the length of the central portion 23 may be 70% or more of the length of the main body portion 20, 80% or more of the length of the main body portion 20, 90% or more of the length of the main body portion 20, or 95% or more of the length of the main body portion 20. In a plan view of the sheet 10 in its extended state, the total length of the pair of first ends 21 in the front-to-back direction L may be less than 30% of the length of the main body 20, less than 20% (or 20% or more) of the length of the main body 20, less than 10% (or 10% or more) of the length of the main body 20, or less than 5% (or 5% or more) of the length of the main body 20. Similarly, in a plan view of the sheet 10 in its extended state, in the width direction W, the length of the central portion 23 may be 50% or more of the length of the main body portion 20, 70% or more of the length of the main body portion 20, 80% or more of the length of the main body portion 20, 90% or more of the length of the main body portion 20, or 95% or more of the length of the main body portion 20. The total length of the pair of second ends 22 may be less than 50% of the length of the main body portion 20, less than 30% (or 30% or more) of the length of the main body portion 20, less than 20% (or 20% or more) of the length of the main body portion 20, less than 10% (or 10% or more) of the length of the main body portion 20, or less than 5% (or 5% or more) of the length of the main body portion 20. Furthermore, if the sheet 10 has a side region SR, the portion corresponding to the side region SR may be the first end 21 and / or the second end 22.

[0034] The fixing part 50 may fix the sheet 10 to the mattress 100 by fixing the main body part 20 to the mattress 100. The fixing part 50 can be anything that can engage the sheet 10 with the mattress 100, and may be, for example, a button (e.g., a snap button), a zipper, a hook-and-loop fastener, etc. In this embodiment, the first fixing part 51 is a button-type fixing part, and the second fixing part 52 is a zipper-type fixing part.

[0035] As shown in Figures 4 and 5, in this embodiment, the mattress 100 may have a first mattress-side fixing portion 151 for engaging with the first fixing portion 51 and a second mattress-side fixing portion 152 for engaging with the second fixing portion 52.

[0036] The first mattress-side fixing portion 151 may be positioned on the main body extension portion 130 that extends from the main body portion 120 of the mattress 100, which is the portion that is placed under the user (see Figure 5). In this embodiment, the first fixing portion 51 and the first mattress-side fixing portion 151 form a single fastener. The first end portion 21 of the main body portion 20 may be fixed by the engagement of the first fixing portion 51 and the first mattress-side fixing portion 151.

[0037] The second mattress-side fixing portion 152 may be positioned on the side surface 100s of the mattress 100 (the main body portion 120). In this embodiment, the second fixing portion 52 may be a convex (or concave) button, and the second mattress-side fixing portion 152 may be a concave (or convex) button. Alternatively, if the second fixing portion 52 is a button, the second mattress-side fixing portion 152 may be a notch into which the button is inserted. The second end portion 22 of the main body portion 20 may be fixed by the engagement of the second fixing portion 52 and the second mattress-side fixing portion 152.

[0038] One of the pair of first fixing parts 51 is for fixing one first end 21 of the main body 20 in the first direction to the mattress 100, and the other of the pair of first fixing parts 51 is for fixing the other first end 21 of the main body 20 in the first direction to the mattress 100. In this embodiment, the first fixing parts 51 are located on both first ends 21 of the main body 20. The first fixing parts 51 are positioned outward in the front-rear direction L than the second fixing parts 52. The first fixing parts 51 may include the fixing part that is positioned furthest outward in the front-rear direction L among a plurality of fixing parts 50.

[0039] One of the pair of second fixing parts 52 is for fixing one second end 22 of the main body 20 in the second direction to the mattress 100, and the other of the pair of second fixing parts 52 is for fixing the other second end 22 of the main body 20 in the first direction to the mattress 100. In this embodiment, the second fixing parts 52 are located on both second ends 22 of the main body 20. The second fixing parts 52 are positioned outward in the width direction W than the first fixing parts 51. The second fixing parts 52 may include the fixing part that is positioned furthest outward in the width direction W among a plurality of fixing parts 50.

[0040] The first fixing part 51 secures the first end 21 of the main body 20 in the first direction to the mattress, and the second fixing part 52 secures the second end 22 of the main body 20 in the second direction to the mattress. This secures the main body 20 of the sheet 10 to the mattress 100 on both the first and second directions, preventing the sheet 10 and mattress 100 from shifting and preventing wrinkles from forming in the main body 20.

[0041] As shown in Figure 3, in the stretched state of the sheet 10, the first fixing portion 51 may have an inner edge 51e1, which is the inner edge in the front-to-back direction L (first direction), and an outer edge 51e2, which is the outer edge in the width direction W (second direction). Similarly, in the stretched state of the sheet 10, the second fixing portion 52 may have an outer edge 52e1, which is the outer edge in the front-to-back direction L (first direction), and an outer edge 52e2, which is the outer edge in the width direction W (second direction). Note that the outside in the front-to-back direction L (first direction) is the side away from the center of the sheet 10 (main body portion 20) in the front-to-back direction L (direction away from the center), and the inside in the front-to-back direction L (first direction) is the side toward the center of the sheet 10 (main body portion 20) in the front-to-back direction L (direction toward the center). The outer side in the width direction W (second direction) is the side away from the center of the sheet 10 (main body 20) in the width direction W (the direction away from the center), and the inner side in the width direction W (second direction) is the side toward the center of the sheet 10 (main body 20) in the width direction W (the direction toward the center).

[0042] The main body portion 20 has a periphery 25 formed by the edges of the main body portion 20 in the planar direction. The periphery 25 of the main body portion 20 may be a portion formed by, for example, processing the edges of the fabric. Therefore, the periphery 25 may be, for example, a portion that serves as the starting point for folding when a sheet-like member constituting the main body portion 20 is folded and the overlapping portion of the sheet is sewn. As shown in Figures 2 and 3, in the stretched state of the sheet 10, the periphery 25 of the main body portion 20 has a fixed-interval periphery 25C that extends in the front-rear direction L (first direction) between the first fixing portion 51 and the second fixing portion 52. As shown in Figure 3, the fixed-interval periphery 25C is the periphery 25 of the main body portion 20 between the inner edge 51e1 of the first fixing portion 51 in the first direction and the outer edge 52e1 of the second fixing portion 52 in the first direction. The fixed-interval periphery 25C is a part of the periphery 25 of the main body portion 20 on the width direction W (second direction) side. In the stretched state of the sheet 10, the fixed periphery 25C has an inner periphery portion 25r that is located inward in the width direction W (second direction) than at least one of the outer edge 51e2 of the first fixing portion 51 and the outer edge 52e2 of the second fixing portion 52. In this embodiment, the inner periphery portion 25r is located inward in the width direction than the outer edge 52e2 of the second fixing portion 52 in the width direction W (second direction), but is not located inward in the width direction W than the outer edge 51e2 of the first fixing portion 51 in the width direction W (second direction). Therefore, the inner periphery portion 25r may be located outward in the width direction W than the outer edge 51e2 of the first fixing portion 51 in the width direction W (second direction).

[0043] Here, the outer edge of the region covered by the main body portion 20 of the mattress 100 is defined by the peripheral edge 25 of the main body portion 20. The fixed intermediate peripheral edge 25C located between the first fixing portion 51 and the second fixing portion 52 is located inside in the second direction than at least one of the outer edges 51e2 of the first fixing portion 51 and the outer edge 52e2 of the second fixing portion 52. Since the inner peripheral edge portion 25r of the fixed intermediate peripheral edge 25C is located inside the position of the outermost edge in the second direction among the positions where the main body portion 20 is fixed by the fixing portion 50 (the edge located outside in the second direction among the outer edges 51e2 of the first fixing portion 51 and the outer edge 52e2 of the second fixing portion 52), a part of the peripheral edge 25 extending in the first direction of the main body portion 20 is located inside in the second direction than the position where the main body portion 20 is fixed to the mattress 100, and the main body portion 20 does not cover the mattress 100 outside in the second direction than the inner peripheral edge portion 25r. Since at least one of the outer edge 51e2 of the first fixing portion 51 and the outer edge 52e2 of the second fixing portion 52 is arranged outside in the second direction than the inner peripheral edge portion 25r, the inner peripheral edge portion 25r that does not cover the mattress 100 can be fixed at a position outside in the second direction than that, and the inner peripheral edge portion 25r can be arranged while suppressing displacement. Therefore, a region (hereinafter, exposed region ER) where the mattress is not covered by the main body portion 20 can be secured, and the air permeability can be improved. As a result, in the exposed region ER, the heat stored in the mattress 100 can be more easily released than in the region covered by the main body portion 20.

[0044] Further, as shown in FIG. 3, in the width direction W (second direction), the outer edge 51e2 of the first fixing portion 51 may be located inside the outer edge 52e2 of the second fixing portion 52. The region outside the first fixing portion 51, that is, the region where the mattress 100 and the main body portion 20 are not fixed by the first fixing portion 51 can be secured wider by the amount that the outer edge 51e2 of the first fixing portion 51 is located inside the outer edge 52e2 of the second fixing portion 52 in the width direction W. As a result, in the said region, the mattress 100 and the main body portion 20 are not in close contact with each other, and the heat stored in the mattress 100 can be more easily released.

[0045] Furthermore, the virtual line connecting the position fixed by the first fixing portion 51 and the position fixed by the second fixing portion 52 extends inside in the front-rear direction L (the first direction). For this reason, for example, when the second end portion 22 of the main body portion 20 is pulled outward in the width direction W after fixing the first fixing portion 51 and before fixing the second fixing portion 52, a force is propagated inward in the front-rear direction L along this virtual line. As a result, between the first fixing portion 51 and the second fixing portion 52, not only in the width direction W but also in the front-rear direction L, the main body portion 20 can be pulled to remove wrinkles.

[0046] Also, the length of the main body portion 20 in the width direction W (the second direction) may be shorter than the length of the main body portion 20 in the front-rear direction L (the first direction). Since the length of the main body portion 20 in the width direction W is short, the user and the inner peripheral edge portion 25r located inside in the width direction W come closer. That is, the distance between the user and the exposed region ER becomes closer, and the heat stored in the mattress transferred from the user's body temperature can be more easily released from the exposed region ER.

[0047] The total length of the second fixing portion 52 in the front-rear direction L may be shorter than the total length of the first fixing portion 51 in the width direction W. By shortening the total length of the second fixing portion 52 that fixes the first end portion 21 of the main body portion 20 in the width direction W, the ratio of the close contact between the main body portion 20 and the mattress 100 by the second fixing portion 52 can be reduced on the end side in the width direction W of the main body portion 20 where the distance from the user is close. As a result, the heat stored in the mattress 100 can be more easily released. The total length of the second fixing portion 52 is preferably, for example, 50% or less of the total length of the first fixing portion 51.

[0048] Also, in the front-rear direction L, the length of the inner peripheral edge portion 25r may be longer than the total length of the second fixing portion 52. The region outside the width direction W from the inner peripheral edge portion 25r becomes the exposed region ER. Therefore, compared with the second fixing portion 52, the length of the exposed region ER can be ensured to be long, and the heat of the mattress can be more easily released. In the front-rear direction L, the length of the inner peripheral edge portion 25r may be, for example, 2% or more of the length of the main body portion 20, and may be 3% or more. In the width direction W, the length of the inner peripheral edge portion 25r may be, for example, 3% or more of the length of the main body portion 20, and may be 6% or more.

[0049] As shown in Figure 3, in this embodiment, the fixed periphery 25C has a non-inner periphery portion 25n that is located outside in the width direction W (second direction) of both the outer edge 51e2 of the first fixed portion 51 and the outer edge 52e2 of the second fixed portion 52. In the front-rear direction L, the total length of the inner periphery portion 25r may be longer than the total length of the non-inner periphery portion 25n. This allows for a longer exposed area ER, making it easier for the mattress to dissipate heat. The total length of the inner periphery portion 25r may be, for example, 150% or more of the total length of the non-inner periphery portion 25n.

[0050] At least one of the first fixing part 51 and the second fixing part 52 may be located in the side region SR. In this embodiment, both the first fixing part 51 and the second fixing part 52 are located in the side region SR. The first fixing part 51 and / or the second fixing part 52 located in the side region SR are located on the side 100s of the mattress 100 when the sheet 10 is attached to the mattress 100. Compared to the case where the fixing part 50 is located on the upper surface 100u of the mattress 100, the user lying on the mattress 100 is less likely to come into contact with the fixing part 50, making it easier to sleep comfortably. Also, compared to the case where it is located on the lower surface 100b of the mattress 100, the fixing part 50 is easier to see and reach without, for example, lifting the mattress 100, making it easier to remove the sheet 10 from the mattress 100.

[0051] In another embodiment, at least one of the first fixing portion 51 and the second fixing portion 52 may be located in the upper surface region UR. For example, if the sheet 10 does not have a side surface region SR, the first fixing portion 51 and the second fixing portion 52 may be located in the upper surface region UR. This makes the entire side surface of the mattress 100 an exposed region ER, which makes it easier for heat to escape from the mattress. Also, when the first fixing portion 51 and the second fixing portion 52 are located in the upper surface region UR, the fixing portion 50 is easily visible when viewed from above the mattress 100, and it is easy to reach the fixing portion 50, making it easy to remove the sheet 10 from the mattress 100.

[0052] At least one of the first fixing portion 51 and the second fixing portion 52 may extend continuously in the planar direction. The first fixing portion 51 and / or the second fixing portion 52 extending continuously in the planar direction allow the sheet to be fixed linearly rather than at points, making it even less likely for the sheet to slip off the mattress.

[0053] In this embodiment, the first fixing portion 51 extends continuously. The first fixing portion 51 extends linearly in the width direction W. The first fixing portion 51 may extend continuously in the width direction W from one second end 22 of the main body portion 20 to the other second end 22. The first fixing portion 51 may extend only partially in the width direction W. The second fixing portion 52 may be similar. In this embodiment, the second fixing portion 52 does not extend continuously.

[0054] In a plan view of the sheet 10 in its extended state, the first fixing portion 51 may be positioned in at least the central region of three regions obtained by dividing the sheet 10 into three equal parts in the width direction W. In this embodiment, the first fixing portion 51 is positioned across the three regions. Alternatively, in a plan view of the sheet 10 in its extended state, the first fixing portion 51 may be positioned in at least two central regions of four regions obtained by dividing the sheet 10 into four equal parts in the width direction W. In this embodiment, the first fixing portion 51 is positioned across the four regions.

[0055] Furthermore, in a plan view of the sheet 10 in its extended state, the second fixing portion 52 may be positioned in at least the central region of three regions obtained by dividing the sheet 10 into three equal parts in the front-to-back direction L. In this embodiment, the second fixing portion 52 is positioned only in the central region. Also, in a plan view of the sheet 10 in its extended state, the second fixing portion 52 may be positioned in at least two central regions of four regions obtained by dividing the sheet 10 into four equal parts in the front-to-back direction L. In this embodiment, the first fixing portion 51 is positioned across the two central regions.

[0056] In a plan view of the sheet 10 in its extended state, the first fixing portion 51 does not have to be located in the outermost regions of the n regions obtained by dividing the sheet 10 into n equal parts in the width direction W. Similarly, in a plan view of the sheet 10 in its extended state, the second fixing portion 52 does not have to be located in the outermost regions of the n regions obtained by dividing the sheet 10 into n equal parts in the front-to-back direction L. n may be a natural number of 5 or more.

[0057] Furthermore, the inner peripheral edge portion 25r may extend in a non-linear manner. The non-linear configuration may include a portion that extends in a straight line, for example, a configuration that includes multiple intersecting straight sections, i.e., a configuration that includes a straight line with a bent section. For example, as shown in Figure 3, the inner peripheral edge portion 25r may be composed of, for example, a straight section that extends inward in the front-rear direction L along the front-rear direction L from the outer edge 51e2 of the first fixing portion 51, and a straight section that extends outward in the width direction W as it extends inward in the front-rear direction L. Compared to the case where the inner peripheral edge portion 25r, which is part of the peripheral edge 25 of the main body portion 20, extends in a straight line, the longer the inner peripheral edge portion 25r, the greater the contact area between the mattress 100 and the peripheral edge 25 of the main body portion 20, making it even more difficult for the main body portion 20 to shift away from the mattress 100. The inner peripheral edge portion 25r may extend in a curved manner, for example.

[0058] Furthermore, in this embodiment, as shown in Figure 2, the peripheral edge 25 of the main body portion 20 may extend inward in the front-rear direction L as it moves outward in the width direction W. Therefore, the central side of the main body portion 20 in the front-rear direction L may be convex in that it moves outward in the width direction W. The length of the portion of the peripheral edge 25 of the main body portion 20 that extends parallel to the front-rear direction L may be 95% or less, 90% or less, or 50% or less of the total length of the main body portion 20. Similarly, the length of the portion of the peripheral edge 25 of the main body portion 20 that extends parallel to the width direction W may be 95% or less, 90% or less, or 50% or less of the total length of the main body portion 20.

[0059] In this embodiment, as shown in Figure 2, in a plan view of the sheet 10, the periphery 25 of the main body portion 20 is located inward in the width direction W from the imaginary line L1 extending in the front-to-back direction L from the outermost edge in the width direction W of the sheet 10, and inward in the front-to-back direction L from the imaginary line L2 extending in the width direction W from the outermost edge in the front-to-back direction L of the sheet 10. The area S enclosed by the imaginary lines L1 and L2 and the periphery 25 of the main body portion 20 does not contain the sheet 10. This ensures that the exposed area ER is secured. In contrast, since a normal sheet is rectangular, in a plan view of the sheet 10 in its extended state, the periphery 25 of the sheet 10 overlaps with the imaginary lines L1 and L2, and the area S enclosed by the imaginary lines L1 and L2 and the periphery 25 of the main body portion 20 is not formed. In a plan view of the sheet 10 in its extended state, the area of ​​region S may be, for example, 0.1% or more of the area of ​​the sheet 10, 0.5% or more, 1% or more, or 3% or more. In this embodiment, since the sheet 10 does not exist in region S, the fixing part 50 does not exist there either.

[0060] In this embodiment, one second fixing part 52 was provided at the center in the front-to-back direction L at one end of the sheet 10 in the width direction W (specifically, the second end 22 of the main body 20). As a result, the sheet 10 is fixed at the center in the front-to-back direction L of the mattress 100, making it difficult for the user (e.g., infants and / or children) to get trapped between the sheet 10 and the mattress 100. In other embodiments, multiple second fixing parts 52 (e.g., two or more second fixing parts 52) may be provided at one end of the sheet 10 in the width direction W, spaced apart in the front-to-back direction L. As a result, the width of the part of the sheet 10 that is not fixed to the mattress 100 is narrowed, making it difficult for the user (e.g., infants and / or children) to get trapped between the sheet 10 and the mattress 100.

[0061] Furthermore, if a plurality of second fixing portions 52 are provided at one second end 22, the second fixing portion 52 defining the inter-fixing periphery 25C may be the second fixing portion 52 located furthest out of the plurality of second fixing portions 52 in the front-rear direction L (first direction). It may be the periphery 25 of the main body portion 20 between the inner edge 51e1 in the first direction of the first fixing portion 51 located closest to the second fixing portion 52 and the outer edge 52e2 in the first direction of the second fixing portion 52. Similarly, if a plurality of first fixing portions 51 are provided at one first end 21, the first fixing portion 51 defining the inter-fixing periphery 25C may be the first fixing portion 51 located furthest out of the plurality of first fixing portions 51 in the width direction W (second direction). The peripheral edge 25 of the main body portion 20 may be the inner edge 51e1 in the first direction of the second fixing portion 52 that is closest to the first fixing portion 51, and the outer edge 52e2 in the first direction of the second fixing portion 52.

[0062] (3) Sheet for mattress 100 according to the modified example Next, the absorbent article according to the modified example will be described with reference to Figures 6 to 8. Figure 6 is a plan view of the sheet 10 according to the first modified example in an extended state. Figure 7 is a cross-sectional view of the bedding 1 when the sheet 10 according to the first modified example is attached to the mattress 100. Specifically, Figure 7A is a schematic cross-sectional view along the line F6A-F6A in Figure 6. Figure 7B is a schematic cross-sectional view along the line F6B-F6B in Figure 6. Figure 7C is a schematic cross-sectional view along the line F6C-F6C in Figure 6. Note that in Figure 7, as in Figure 4, an exploded view is shown with the mattress 100 and the sheet 10 separated. Figure 8 is a plan view of the sheet 10 according to the second modified example in an extended state. Note that in the following description, the same reference numerals will be used for components similar to those in the embodiments described above, and their explanation will be omitted.

[0063] The sheet 10 according to the first modification has a bottom surface region BR that is positioned on the bottom surface (i.e., the base surface) 100b of the mattress 100. As shown in Figures 6 and 7, the sheet 10 according to the first modification has a fixed extension 55 that extends outward from the main body 20 in the width direction W, and on which the second fixing part 52 is positioned. The fixed extension 55 may be joined to the second end 22 of the main body 20. The fixed extension 55 may be formed from the same material as the main body 20, or from a different material than the main body 20. As shown in Figure 7B, when the sheet 10 is attached to the mattress 100, at least a part of the fixed extension 55 may be positioned on the bottom surface 100b of the mattress 100. The bottom surface region BR may be located on (a part of) the fixed extension 55.

[0064] As shown in Figure 6, at least one of the first fixing part 51 and the second fixing part 52 may be provided in multiple locations at discontinuous intervals at one end of the sheet. Since the sheet 10 can be fixed to the mattress 100 at multiple locations, the sheet 10 becomes less likely to slip off the mattress 100. Between the first fixing parts 51 and / or between the second fixing parts 52, the sheet 10 is not fixed to the mattress 100, making it easier to ensure breathability. Furthermore, since the width of the part of the sheet 10 that is not fixed to the mattress 100 is narrowed, it becomes more difficult for the user (for example, an infant and / or a child) to get between the sheet 10 and the mattress 100.

[0065] In this modified example, the second fixing portion 52 is provided in multiple locations at discontinuous intervals at one end of the sheet 10 in the width direction W. As shown in Figure 6, when the sheet 10 is extended, the second inter-fixing periphery 25M of the periphery 25 of the main body portion 20, which extends in the front-rear direction L between the multiple second fixing portions 52, may have a central inner periphery portion 25Mr located inward in the width direction W from the outer edge 52e2 of the second fixing portion 52. Outside the central inner periphery portion 25Mr located between the multiple second fixing portions 52, there is an exposed area ER (see Figure 7C). As a result, heat stored in the mattress 100 can be released more easily in this exposed area ER compared to the part covered by the main body portion 20.

[0066] At least one of the first fixing portion 51 and the second fixing portion 52 may be located in the lower surface region BR. The first fixing portion 51 and / or the second fixing portion 52 located in the lower surface region BR are located on the lower surface 100b of the mattress 100 when the sheet 10 is attached to the mattress 100. Compared to the case where the fixing portion 50 is located on the upper surface 100u of the mattress 100, the user lying on the mattress 100 will not come into contact with the fixing portion 50, making it easier to sleep comfortably. Due to the weight of the mattress 100, the fixing portion 50 and the mattress 100 will be in close contact, making it difficult for the fixing portion 50 to come off, and further preventing the sheet 10 from shifting away from the mattress 100. In this embodiment, the second fixing portion 52 is located in the lower surface region BR. Therefore, the second fixing portion 52 is located in the portion that is positioned on the lower surface 100b of the fixing extension portion 55.

[0067] Furthermore, the central inner peripheral edge portion 25Mr may be located inward in the width direction W from the inner peripheral edge portion 25r. This allows for a wider exposed area ER closer to the user's torso. As a result, heat stored in the mattress 100 can be released more easily.

[0068] In other embodiments, the central inner peripheral edge portion 25Mr may not be provided. Therefore, between the multiple second fixing portions 52 in the front-rear direction L, the peripheral edge 25 of the main body portion 20 (i.e., the peripheral edge 25M between the second fixing portions) may extend parallel to the front-rear direction L.

[0069] As shown in Figures 7A and 7C, the main body 20 covers a portion of the upper surface 100u of the mattress 100, and does not need to cover the entire upper surface 100u. This makes it easier for heat to escape from the upper surface 100u of the mattress 100.

[0070] As shown in Figure 8, the sheet 10 according to the second modification example may further include an extension portion 60 extending from the main body portion 20 outward in the width direction W from the inner peripheral edge portion 25r. The breathability of the extension portion 60 is higher than that of the main body portion 20. In the area of ​​the mattress where the extension portion 60 is placed, the mattress 100 is not directly exposed while ensuring breathability, thus preventing the mattress 100 from becoming soiled.

[0071] The extension portion 60 extends outward in the planar direction (i.e., in the front-to-back direction L and / or width direction W) beyond the peripheral edge 25 of the main body portion 20. The extension portion 60 may be joined to the peripheral edge 25 of the main body portion 20, or it may be joined to the main body portion 20 inside the peripheral edge 25 of the main body portion 20. The peripheral edge 25 of the main body portion 20 may be defined by the boundary where the extension portion 60 and the main body portion 20 are joined. The portion inside the boundary may be the main body portion 20, and the portion outside the boundary may be the extension portion 60.

[0072] The breathability of the extension portion 60 is configured to be higher than that of the main body portion 20. The extension portion 60 may be formed of, for example, a mesh material. The main body portion 20 and the extension portion 60 may be formed of different materials. For example, the main body portion 20 may be made of a natural material such as cotton, and the extension portion 60 may be made of a synthetic material. For example, if the main body portion 20 and the extension portion 60 are made of the same material, the main body portion 20 may be formed by layering multiple woven fabrics in the thickness direction T. In this case, the number of woven fabrics forming the extension portion 60 may be less than the number of woven fabrics forming the main body portion 20. Also, if the main body portion 20 and the extension portion 60 are made of the same material, the thickness of the extension portion 60 may be thinner than the thickness of the main body portion 20.

[0073] Air permeability may be compared, for example, by measuring the air permeability resistance value. Air permeability may be measured, for example, as follows: The measurement environment is set to a temperature of 20°C and a humidity of 60%.

[0074] First, prepare the sheet to be measured, separate it into the main body 20 and the extension 60, and cut each into samples, for example, 60 mm wide x 60 mm long x 80 mm thick.

[0075] Secondly, the air permeability may be measured using the cut-out sample, for example, with a Kato Tech KES-F8AP1 Fragile air permeability measuring instrument.

[0076] (4) Other Embodiments In the embodiments and modifications described above, cases have been described in which the main body portion 20 has an upper surface area UR (only) or has a side surface area SR in addition to the upper surface area UR, but it is not limited to these. The main body portion 20 may also have a lower surface area BR. Accordingly, although a case has been described in which the main body portion 20 is placed on the upper surface 100u of the mattress 100 and also on the side surface 100s of the mattress 100, it is not limited to this. For example, when the sheet 10 is attached to the mattress 100, a part of the main body portion 20 may be placed on the lower surface 100b of the mattress 100. Even when a part of the main body portion 20 is placed on the lower surface 100b of the mattress 100, the inner peripheral edge portion 25r ensures that at least a part of the side surface 100s of the mattress 100 is not covered by the main body portion 20.

[0077] The first fixing portion 51 and / or the second fixing portion 52 may be arranged in the lower surface region BR (only), or in the lower surface region BR and other regions (i.e., the side surface region SR and / or the upper surface region UR). Alternatively, the first fixing portion 51 and / or the second fixing portion 52 may be arranged in the side surface region SR and / or the upper surface region UR (only).

[0078] In the embodiments and modifications described above, the inner peripheral edge 25r was located inward in the width direction W from the outer edge 51e2 of the first fixing part 51 and inward in the width direction from the outer edge 52e2 of the second fixing part 52, but is not limited to this. The inner peripheral edge 25r may be located inward in the width direction W from the outer edge 51e2 of the first fixing part 51 and not located inward in the width direction from the outer edge 52e2 of the second fixing part 52 (i.e., located outward). Furthermore, the inner peripheral edge 25r may be located inward in the width direction W from both the outer edge 51e2 of the first fixing part 51 and the outer edge 52e2 of the second fixing part 52.

[0079] Furthermore, in the above-described embodiments and each of the modifications, the peripheral edge 25 of the main body portion 20 may have an inner peripheral edge portion (hereinafter referred to as the inner peripheral edge portion in the first direction) that extends in the width direction W (second direction) between the first fixing portion 51 and the second fixing portion 52 in the width direction W, and is located inward in the front-rear direction L (first direction) from at least one of the outer edge of the first fixing portion 51 in the first direction and the outer edge of the second fixing portion 52 in the first direction. The inner peripheral edge portion in the first direction may have a portion that is common with the inner peripheral edge portion 25r (i.e., the inner peripheral edge portion in the second direction).

[0080] Although the present invention has been described in detail using the embodiments described above, it will be clear to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description herein is for illustrative purposes only and is not intended to be restrictive in any way to the present invention.

[0081] Furthermore, the entire contents of Japanese Patent Application No. 2024-169376, filed on September 27, 2024, are incorporated herein by reference.

[0082] We can provide mattress sheets that securely attach to the mattress while also allowing heat trapped inside the mattress to escape easily.

[0083] 10: Sheet 20: Main body 25: Periphery of main body 25C: Periphery between fixings 25M: Periphery between second fixings 25Mr: Central inner periphery 25r: Inner periphery 51: First fixing part 52: Second fixing part 60: Extension part 100: Mattress L: Front-to-back direction T: Thickness direction W: Width direction SR: Side area BR: Bottom area

Claims

1. A mattress sheet comprising: a first and second direction extending in a planar direction and mutually orthogonal to each other; a thickness direction perpendicular to the planar direction; a main body portion disposed on at least the upper surface of the mattress; a pair of first fixing portions for fixing both ends of the main body portion in the first direction to the mattress; and a pair of second fixing portions for fixing both ends of the main body portion in the second direction to the mattress, wherein the inter-fixing periphery of the main body portion extending in the first direction between the first fixing portion and the second fixing portion has an inner periphery portion located inward in the second direction than at least one of the outer edge of the first fixing portion in the second direction and the outer edge of the second fixing portion in the second direction.

2. The mattress sheet according to claim 1, wherein in the second direction, the outer edge of the first fixing portion is located inward from the outer edge of the second fixing portion.

3. The mattress sheet according to claim 1 or 2, wherein the length of the main body in the second direction is shorter than the length of the main body in the first direction.

4. The mattress sheet according to claim 3, wherein the total length of the second fixing portion in the first direction is shorter than the total length of the first fixing portion in the second direction.

5. The mattress sheet according to claim 1 or 2, wherein in the first direction, the length of the inner peripheral edge is longer than the total length of the second fixing portion.

6. The sheet for a mattress according to claim 1 or 2, wherein the sheet has a side region that is positioned on the side of the mattress, and at least one of the first fixing portion and the second fixing portion is located in the side region.

7. The sheet for a mattress according to claim 1 or 2, wherein the sheet has a lower surface area that is positioned on the lower surface of the mattress, and at least one of the first fixing part and the second fixing part is located in the lower surface area.

8. The mattress sheet according to claim 1 or 2, wherein at least one of the first fixing portion and the second fixing portion extends continuously in the planar direction.

9. The mattress sheet according to claim 1 or 2, wherein at least one of the first fixing portion and the second fixing portion is provided in a plurality at discontinuous intervals at one end of the sheet.

10. The mattress sheet according to claim 9, wherein the second fixing portion is provided in multiple locations at discontinuous intervals at one end of the sheet in the second direction, and the second inter-fixing periphery of the main body portion that extends in the first direction between the plurality of second fixing portions has a central inner periphery portion that is located inward in the second direction from the outer edge of the second fixing portion.

11. The mattress sheet according to claim 1 or 2, wherein the inner peripheral edge extends in a non-linear manner.

12. A mattress sheet according to claim 1 or 2, further comprising an extension portion extending outward from the main body portion in the second direction from the inner peripheral edge portion, wherein the breathability of the extension portion is higher than that of the main body portion.

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