Mattress sheets

Abstract

We provide a mattress sheet that stays securely in place while allowing heat trapped in the mattress to escape easily. [Solution] The sheet (1) for the mattress (100) comprises a main body (20) positioned on at least the upper surface of the mattress, a first and second direction extending in a planar direction and perpendicular to each other, a thickness direction (T) perpendicular to the planar direction, a pair of first fixing parts (51) for fixing both ends (21) of the main body in the first direction to the mattress, and a pair of second fixing parts (52) for fixing both ends (22) of the main body in the second direction to the mattress. The inter-fixing periphery (25C) of the periphery (25) of the main body, which extends in the first direction between the first fixing part and the second fixing part, has an inner periphery (25r) that is located inward in the second direction from at least one of the outer edge 51e2 of the first fixing part in the second direction and the outer edge 51e2 of the second fixing part in the second direction.

Description

Technical Field

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

Background Art

[0002] Conventionally, a sheet for a mattress in which an opening for inserting and removing a mattress is formed on one surface of a box-shaped fabric has been widely known (see, for example, Patent Document 1). By inserting the mattress into the inside of the sheet through the opening, the mattress can be covered with the sheet. Since the end portion 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 formation of wrinkles in the sheet. <00000!0>

Prior Art Documents

Patent Documents

[0003] [[ID=2!]]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

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

[0005] When the user's body temperature 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 position on the mattress. As a result, heat may be trapped in the user's body, resulting in poor sleep or shallow sleep. In addition, when the user is an infant, there is a concern about unexpected physical discomfort due to high body temperature (so-called heat rash).​​​This invention was made in view of these problems, and provides a mattress sheet that can be fixed to the mattress while allowing heat trapped in the mattress to escape easily. [Means for solving the problem]

[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. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of the bedding 1 according to the embodiment. [Figure 2] Figure 2 is a plan view of the mattress sheet in an extended state according to the embodiment. [Figure 3] Figure 3 is a schematic, partially enlarged view of the sheet according to the embodiment shown in Figure 2. [Figure 4] Figure 4 is a schematic cross-sectional view of the bedding shown in Figure 1. [Figure 5] Figure 5 is a schematic cross-sectional view of the bedding shown in Figure 1. [Figure 6] Figure 6 is a plan view of the sheet in its extended state according to the first modification example. [Figure 7] 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] Figure 8 is a plan view of the sheet in its extended state according to the second modification example. [Modes for carrying out the invention]

[0009] (1) Outline of the Embodiment The following matters become clear from 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 point 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 ventilation. 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 contact between the main body and the mattress 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, 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] According to a preferred aspect, in the invention according to aspect 7, in the invention according to any one of aspects 1 to 6, the sheet has a lower surface region disposed on the lower surface of the mattress, and at least one of the first fixing portion and the second fixing portion is located in the lower surface region. According to this aspect, the first fixing portion and / or the second fixing portion located in the lower surface region is located on the lower surface of the mattress when the sheet is attached to the mattress. Compared with the case where the fixing portion is located on the upper surface of the mattress, a user sleeping on the mattress does not hit the fixing portion, and it becomes easier to sleep comfortably. Due to the weight of the mattress, the fixing portion and the mattress are in close contact with each other, so that the fixing portion is difficult to come off, and the sheet is more difficult to shift from the mattress.

[0018] According to a preferred aspect, in the invention according to aspect 8, in the invention according to any one of aspects 1 to 7, at least one of the first fixing portion and the second fixing portion extends continuously in the planar direction. According to this aspect, the first fixing portion and / or the second fixing portion that extends continuously in the planar direction can fix the sheet linearly rather than pointwise, so that the sheet is more difficult to shift from the mattress.

[0019] According to a preferred aspect, in the invention according to aspect 9, in the invention according to any one of aspects 1 to 8, at least one of the first fixing portion and the second fixing portion is provided in a plurality of non - continuous intervals at one end of the sheet. According to this aspect, since the sheet can be fixed to the mattress at a plurality of locations, the sheet is more difficult to shift from the mattress. Between the first fixing portions and / or between the second fixing portions, since the sheet is not fixed to the mattress, it becomes easier to ensure ventilation.

[0020] According to a preferred embodiment, in the invention according to Embodiment 10, in the invention according to Embodiment 9, a plurality of the second fixing portions are provided at intervals discontinuously at one end of the sheet in the second direction, and a second fixing intermediate peripheral edge extending in the first direction between the plurality of second fixing portions among the peripheral edges of the main body portion has a central inner peripheral edge portion located on the inner side in the second direction from the outer edge of the second fixing portion. According to this embodiment, an exposed area exists outside the central inner peripheral edge portion located between the plurality of second fixing portions in the second direction. As a result, in the exposed area, heat stored in the mattress can be more easily released compared to the portion covered by the main body portion.

[0021] According to a preferred embodiment, in the invention according to Embodiment 11, in the invention according to any one of Embodiments 1 to 10, the inner peripheral edge portion extends in a non-linear shape. According to this embodiment, compared to the case where the inner peripheral edge portion, which is a part of the peripheral edge of the main body portion, extends linearly, the length of the inner peripheral edge portion increases, so that the contact area between the mattress and the peripheral edge of the main body portion increases, and it becomes more difficult for the main body portion to shift from the mattress.

[0022] According to a preferred embodiment, in the invention according to Embodiment 12, in the invention according to any one of Embodiments 1 to 11, an extension portion extending from the main body portion toward the outside in the second direction from the inner peripheral edge portion is further provided, and the air permeability of the extension portion is higher than the air permeability of the main body portion. According to this embodiment, in the region of the mattress where the extension portion is arranged, while ensuring air permeability, since the mattress is not directly exposed, it is possible to suppress the mattress from getting dirty.

[0023] (2) Sheet for Mattress According to Embodiment Hereinafter, a sheet for a mattress according to an embodiment will be described with reference to the drawings. In the following description of the 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 each dimension and the like are different from the actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Also, there may be portions where the relationship and ratio of the dimensions to each other are different between the drawings.

[0024] Figure 1 is a perspective view of bedding 1 according to an embodiment. In Figure 1, a sheet 10 is attached to a mattress 100. Figure 2 is a plan view of the sheet 10 for 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 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 sheet 10 separated. Figure 5 is a schematic cross-sectional view of 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 turn over freely 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 the planar direction and are mutually orthogonal, and a thickness direction T that is orthogonal 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 foot / foot 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 also 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-to-back 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 surface 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 top 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 ends 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 ends 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 it. 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 both ends (hereinafter referred to as a pair of first ends) 21 in a first direction (front-to-back direction L), both ends (hereinafter referred to as a pair of second ends) 22 in a second direction (width direction W) of the main body portion 20, 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 portion 20, 70% or more of the length of the main portion 20, 80% or more of the length of the main portion 20, 90% or more of the length of the main portion 20, or 95% or more of the length of the main portion 20. The total length of the pair of second ends 22 may be less than 50% of the length of the main portion 20, less than 30% (or 30% or more) of the length of the main portion 20, less than 20% (or 20% or more) of the length of the main portion 20, less than 10% (or 10% or more) of the length of the main portion 20, or less than 5% (or 5% or more) of the length of the main 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 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 at both second ends 22 of the main body 20. The second fixing parts 52 are positioned further outward than the first fixing parts 51 in the width direction W. The second fixing parts 52 may include the outermost fixing part among a plurality of fixing parts 50 in the width direction W.

[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 part 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 part 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 part 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 part 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, finishing 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 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 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 inter-fixed 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 extended state of the sheet 10, the inter-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 area covered by the main body 20 over the mattress 100 is defined by the periphery 25 of the main body 20. The inter-fixing periphery 25C, located between the first fixing part 51 and the second fixing part 52, is located inward in the second direction from at least one of the outer edge 51e2 of the first fixing part 51 and the outer edge 52e2 of the second fixing part 52. Because the inner periphery 25r of the inter-fixing periphery 25C is located further inward in the second direction from the outermost edge in the second direction of the position where the main body 20 is fixed by the fixing part 50 (the edge located outward in the second direction from the outer edge 51e2 of the first fixing part 51 and the outer edge 52e2 of the second fixing part 52), a portion of the periphery 25 of the main body 20 extending in the first direction is located inward in the second direction from the position where the main body 20 is fixed to the mattress 100, and the main body 20 does not cover the mattress 100 outside the inner periphery 25r in the second direction. Since at least one of the outer edge 51e2 of the first fixing part 51 and the outer edge 52e2 of the second fixing part 52 is positioned outside the inner peripheral edge 25r in the second direction, the inner peripheral edge 25r that does not cover the mattress 100 can be fixed at a position outside of it in the second direction, thereby suppressing displacement and allowing the inner peripheral edge 25r to be positioned. As a result, an area of ​​the mattress not covered by the main body 20 (hereinafter referred to as the exposed area ER) can be secured, improving breathability. Consequently, heat stored in the mattress 100 can be released more easily in the exposed area ER compared to the area covered by the main body 20.

[0044] Furthermore, as shown in Figure 3, in the width direction W (second direction), the outer edge 51e2 of the first fixing part 51 may be located inward from the outer edge 52e2 of the second fixing part 52. By the amount that the outer edge 51e2 of the first fixing part 51 is located inward from the outer edge 52e2 of the second fixing part 52 in the width direction W, a wider area outside the first fixing part 51, that is, an area where the mattress 100 and the main body 20 are not fixed by the first fixing part 51, can be secured. As a result, in this area, the mattress 100 and the main body 20 are not in close contact, making it easier for the heat stored in the mattress 100 to dissipate.

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

[0046] Furthermore, the length of the main body 20 in the width direction W (second direction) may be shorter than the length of the main body 20 in the front-to-back direction L (first direction). Because the length of the main body 20 in the width direction W is short, the user is closer to the inner peripheral edge 25r located inside the width direction W. In other words, the distance between the user and the exposed area ER is reduced, making it easier for the heat stored in the mattress, transferred from the user's body heat, to escape from the exposed area ER.

[0047] The total length of the second fixing portion 52 in the front-to-back 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 proportion of contact between the main body portion 20 and the mattress 100 by the second fixing portion 52 at the end portion of the main body portion 20 in the width direction W, which is closer to the user, can be reduced. As a result, the heat stored in the mattress 100 can be released more easily. The total length of the second fixing portion 52 is preferably 50% or less of the total length of the first fixing portion 51, for example.

[0048] Furthermore, in the front-to-back 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 area outside the inner peripheral edge portion 25r in the width direction W becomes the exposed area ER. Therefore, compared to the second fixing portion 52, a longer exposed area ER can be secured, making it easier to dissipate heat from the mattress. In the front-to-back 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, or 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, or 6% or more.

[0049] As shown in Figure 3, in this embodiment, the inter-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 fixing portion 51 and the outer edge 52e2 of the second fixing 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 when the fixing part 50 is located on the top 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 when it is located on the bottom surface 100b of the mattress 100, the fixing part 50 is easier to see and reach without having to lift the mattress 100, for example, making it easier to remove the sheet 10 from the mattress 100.

[0051] In another embodiment, at least one of the first fixing part 51 and the second fixing part 52 may be located in the upper surface area UR. For example, if the sheet 10 does not have a side surface area SR, the first fixing part 51 and the second fixing part 52 may be located in the upper surface area UR. This makes the entire side surface of the mattress 100 an exposed area ER, which makes it easier for heat to escape from the mattress. Also, when the first fixing part 51 and the second fixing part 52 are located in the upper surface area UR, the fixing parts 50 are easily visible when viewed from above the mattress 100, and the fixing parts 50 are easily accessible, 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 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 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] Furthermore, 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, as shown in Figure 3, the inner peripheral edge 25r may extend in a non-linear manner. Compared to the case where the inner peripheral edge 25r, which is part of the peripheral edge 25 of the main body 20, extends in a linear manner, the longer the inner peripheral edge 25r, the greater the contact area between the mattress 100 and the peripheral edge 25 of the main body 20, making it even more difficult for the main body 20 to slip away from the mattress 100. The inner peripheral edge 25r may extend in a curved shape, 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 inside the width direction W of 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 inside the front-to-back direction L of 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, if 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 is not present in region S, the fixing part 50 is also not present.

[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 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 between the sheet 10 and the mattress 100.

[0061] Furthermore, if a plurality of second fixing portions 52 are provided at one of the second ends 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 of the first ends 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 as an example of modification Next, the absorbent article relating to the modified example will be described with reference to Figures 6 to 8. Figure 6 is a plan view of the sheet 10 in its extended state relating to the first modified example. Figure 7 is a cross-sectional view of the bedding 1 when the sheet 10 relating 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 in its extended state relating to the second modified example. Note that in the following description, components similar to those in the above-described embodiment will be described using the same reference numerals and their explanation will be omitted.

[0063] The sheet 10 according to the first modification example has a bottom surface area BR that is positioned on the bottom surface (i.e., bottom surface) 100b of the mattress 100. As shown in Figures 6 and 7, the sheet 10 according to the first modification example has a fixed extension portion 55 that extends outward from the main body portion 20 in the width direction W, and on which the second fixing portion 52 is positioned. The fixed extension portion 55 may be joined to the second end portion 22 of the main body portion 20. The fixed extension portion 55 may be formed from the same material as the main body portion 20, or from a different material than the main body portion 20. As shown in Figure 7B, when the sheet 10 is attached to the mattress 100, at least a part of the fixed extension portion 55 may be positioned on the bottom surface 100b of the mattress 100. The bottom surface area BR may be located on (a part of) the fixed extension portion 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 along one end of the sheet. Since the sheet 10 can be fixed to the mattress 100 at multiple locations, the sheet 10 becomes even 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 (e.g., infants and / or children) to get trapped 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 compared to 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 that extends outward in the width direction W from the main body portion 20 beyond 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 from, for example, a mesh material. The main body portion 20 and the extension portion 60 may be formed from different materials. For example, the main body portion 20 may be made from a natural material such as cotton, and the extension portion 60 may be made from a synthetic material. For example, if the main body portion 20 and the extension portion 60 are made from 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 from 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 can 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 20 has only an upper surface area UR, 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 20 may also have a lower surface area BR. Therefore, although a case has been described in which the main body 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 a sheet 10 is attached to the mattress 100, a part of the main body 20 may be placed on the lower surface 100b of the mattress 100. Even when a part of the main body 20 is placed on the lower surface 100b of the mattress 100, the inner peripheral edge 25r ensures that at least a part of the side surface 100s of the mattress 100 is not covered by the main body 20.

[0077] The first fixing part 51 and / or the second fixing part 52 may be arranged in the lower surface area BR (only), or in the lower surface area BR and other areas (i.e., the side surface area SR and / or the upper surface area UR). Alternatively, the first fixing part 51 and / or the second fixing part 52 may be arranged in the side surface area SR and / or the upper surface area 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. [Explanation of symbols]

[0081] 10: Sheets 20: Main body 25: Periphery of the main body 25C: Peripheral area between fixed parts 25M: Peripheral edge of the second fixed section 25Mr: Central inner peripheral edge 25r: Inner peripheral edge 51: 1st fixed part 52:Second fixed part 60: Extension part 100: Mattress L: Front and back direction T: Thickness direction W: width direction SR: Side area BR: Bottom area

Claims

1. It is a sheet for a mattress, A first direction and a second direction that extend in the plane direction and are mutually orthogonal, and a thickness direction that is orthogonal to the plane direction, The main body portion is positioned on at least the upper surface of the mattress, A pair of first fixing parts for fixing both ends of the main body in the first direction to the mattress, The main body comprises a pair of second fixing parts for fixing both ends of the main body in the second direction to the mattress, A mattress sheet, wherein the inter-fixing periphery of the main body portion, which extends 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 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.

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

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

4. 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. A mattress sheet according to claim 3.

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

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

7. The sheet has a bottom surface area that is placed on the underside of the mattress, At least one of the first fixing portion and the second fixing portion is located in the lower surface region. A mattress sheet according to claim 1 or 2.

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

9. At least one of the first fixing portion and the second fixing portion is provided in multiple locations at discontinuous intervals at one end of the sheet. A mattress sheet according to claim 1 or 2.

10. The second fixing portion is provided in multiple locations at discontinuous intervals at one end of the sheet in the second direction. 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. A mattress sheet according to claim 9.

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

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

Images