pillow

Abstract

We provide a pillow that drains water well and is easy to wash. [Solution] The pillow comprises a top surface that extends in the width direction and in the front-to-back direction intersecting the width direction, on which the user's head rests, and a bottom surface that extends in the width direction and in the front-to-back direction, located on the opposite side of the top surface, and the maximum thickness of the pillow is T max The shortest distance R from all internal positions to the outer surface is such that min The maximum thickness is 25mm or less. max (T) is greater than twice the shortest distance from any internal location to the outer surface. max > 2×R min ) satisfies the following.

Description

Technical Field

[0001] This disclosure relates to pillows.

Background Art

[0002] Patent Document 1 discloses a pillow filled with chips of a film-free urethane foam without a cell membrane. Patent Documents 2, 3, and 4 disclose pillows provided with a plurality of through holes. Patent Documents 3 and 4 disclose pillows formed with a plurality of grooves. Specifically, Patent Document 1 discloses a pillow with good air permeability and easy to wash. Patent Document 2 discloses a pillow in which the diameter of the through holes is 10 to 15 mm, and 20 to 60 through holes are formed per pillow. Patent Document 3 discloses a pillow in which 100 to 300 holes are drilled. Patent Document 4 discloses a pillow having vertical holes in the vertical direction and horizontal holes in the horizontal direction, and the vertical holes and the horizontal holes intersect and communicate with each other.

[0003] Patent Document 5 discloses a pillow provided with a large number of inclined ribs and forming an open groove between the lower portions of adjacent ribs for the purpose of preventing excessive pressure from being applied to the head and neck. Patent Document 6 discloses a pillow that is easy to fold and difficult to break.

Prior Art Documents

Problems to be Solved by the Invention

[0005] Pillows may be washed to keep them clean. In such cases, it is desirable for the pillow to complete dehydration and drying quickly. The present disclosure provides a pillow with good drying performance and easy washability.

Means for Solving the Problems

[0006] A pillow according to one aspect of the present disclosure has a maximum thickness T max of the pillow, and the shortest distance R min from all internal positions to the outer surface is within 25 mm, and the maximum thickness is greater than twice the shortest distance from all internal positions to the outer surface (T max > 2×R min ).

Effects of the Invention

[0007] According to the present disclosure, a pillow with good drying performance and easy washability can be provided.

Brief Description of the Drawings

[0008] [Figure 1] Cross-sectional view showing a test piece for a drying test and a conceptual diagram of the shortest distance Rmin to the outer surface. [Figure 2] Perspective view showing the pillow of Example 1. [Figure 3] Side view showing the pillow of Example 1. [Figure 4] Side view showing the pillow of Example 2. [Figure 5] Side view showing the pillow of Example 3. [Figure 6] Side view showing the pillow of Example 4. [Figure 7] Top view (a) and front view (b) showing the pillow of Example 4. [Figure 8] Side view showing the pillow of Example 5. [Figure 9] Top view (a) and front view (b) showing the pillow of Example 5. [Figure 10]A side view showing the pillow of Example 6. [Modes for carrying out the invention]

[0009] Hereinafter, an embodiment of this disclosure will be described with reference to the drawings. Note that when a numerical range is indicated using "~", it includes both the lower and upper limits unless otherwise specified. For example, "1~5" includes both the lower limit "1" and the upper limit "5". In other words, "1~5" means the same as "1 or more and 5 or less".

[0010] In this embodiment, the pillow 1 is placed on top of a mattress or futon. Pillow 1 is primarily used in a supine position where the user's head is in contact with the pillow, as well as in a side-sleeping position where the user is lying on their side and their head is in contact with the pillow.

[0011] Pillow 1 is made of foamed resin and is a foam material. Pillow 1 in this embodiment is a resin foam containing an open-cell structure, and is formed of, for example, soft polyurethane foam. Examples of foamed resins that form pillow 1 include low-rebound polyurethane foam with a 25% compression hardness of 40N to 300N (JIS K6400-2 Method D) and a rebound elasticity of 50% or less (JIS K 6400-3) according to JIS K6400. The compression hardness and rebound elasticity values ​​shown are those measured according to the measurement methods indicated in JIS K6400-1 to JIS K6400-5, but when applying international standards or other standards, they will be converted appropriately based on the respective standards. From the viewpoint of ensuring comfortable sleep, a low-rebound material having a rebound elasticity of 40% or less, more preferably 30% or less, even more preferably 20% or less, and particularly preferably 15% or less is preferred. However, low-rebound polyurethane foam has low breathability and tends to dry poorly after washing. Pillow 1 may be polyurethane foam cut and shaped from slab foam, or it may be molded polyurethane foam.

[0012] <Wash and Dry Test> A test was conducted to investigate the relationship between the thickness of polyurethane foam and the drying time. The test results are shown in Table 1. Plate-shaped test specimens measuring 300 x 300 mm with varying thicknesses from 10 to 80 mm were prepared, and wash-drying tests were conducted. The polyurethane foam was not defilmed. The density of the polyurethane foam was 35 kg / m³. 3 Low-rebound polyurethane foam with a rebound elasticity of 15% or less (JIS K 6400-3) and a 25% compression hardness of 45N (JIS K6400-2 Method D) was used. Each test piece was washed in a standard household washing machine, spun dry for 6 minutes, and then dried on a coarse mesh in a test chamber at 23°C and 50% RH. The mass was measured at regular intervals, and the moisture content was calculated. In the table, the initial mass [g] is the mass of the test piece before the wash-dry test. The drying test time 0 [h] is the moisture content [wt%] immediately after spin-drying at the start of the wash test and immediately before the start of the drying test (when the drying time has elapsed for 0 hours).

[0013] [Table 1]

[0014] The moisture content was determined by measuring the mass at regular intervals and calculating the moisture content using the following formula. Moisture content = [(Mass after drying time - Mass before washing) / Mass before washing × 100] ... (Equation 1)

[0015] In the drying test, if the moisture content was 0 wt% or less, the test specimen was considered dry and treated as having reached 0 wt%. The drying test results showed that the time it took for the moisture content to reach 0 wt% after washing (hereinafter referred to as drying time) was 24 hours for a thickness of 50 mm, 18 hours for a thickness of 40 mm, 11 hours for a thickness of 35 mm, 10 hours for a thickness of 30 mm, 6 hours for a thickness of 20 mm, and 4 hours for a thickness of 10 mm (Table 1).

[0016] <Dry thickness Td> The drying test yielded the relationship between thickness and drying time shown above (Table 1). Here, the dry thickness Td is the thickness T obtained when plate-shaped test specimens of polyurethane foam, of different thicknesses, are left to stand under certain conditions for a certain period of time and dried until the moisture content reaches 0 wt%. If the target drying time is set to 24 hours, the maximum dry thickness Td after 24 hours will be 50 mm. If the moisture content reaches 0 wt% after 24 hours of drying, the drying properties are good, and the pillow can be washed.

[0017] The target drying time can be set to 24 hours, 18 hours, 11 hours, 10 hours, 8 hours, 6 hours, or 4 hours. The dried thickness Td after a certain period of time is 50 mm, 40 mm, preferably 35 mm, more preferably 30 mm, and particularly preferably 25 mm or 20 mm.

[0018] By the way, polyurethane foam consists of many cells that are connected in contact with each other. Adjacent cells are connected through a membrane called a cell window, which is partially broken. Assume that each cell is in contact with n neighboring cells. A certain cell is adjacent to n cells, and is connected to the cell next to that. In that case, there are n × n possible pathways in the cell two cells away. In this way, moisture and water vapor inside the polyurethane foam pass through adjacent cells and reach the outer surface of the pillow via various paths. Moisture and water vapor do not necessarily only travel along the shortest path.

[0019] However, experimental results showed that drying properties such as drying time and drying speed are greatly influenced by the thickness of the foam. To shorten the drying time, we focused on making the thickest parts as thin as possible, thereby minimizing the distance from any point inside the pillow to the outer surface.

[0020] <Shortest distance R min > Figure 1 shows the shortest distance R to the outer surface. min A conceptual diagram is shown. The central region containing the center line in the thickness direction H of the pillow dries less easily than the region located on the outer surface of the pillow than the central region. Moisture and water vapor inside the pillow evaporate and dry in all directions, centered on the shortest distance from the center of the thickness to the outer surface. Therefore, the shortest distance R from any point on the pillow to the outer surface...min (Hereinafter, the shortest distance R to the outer surface min (which may be the case) is considered to be such that the moisture content becomes 0 wt% after a certain period of time if it is within 1 / 2 of the drying thickness Td after a certain period of time. The present invention focuses on the shortest distance R min to the outer surface, and makes the shortest distance R min from all internal positions to the outer surface as short as possible.

[0021] As shown in FIG. 1, the shortest distance R from all internal positions to the outer surface min is the shortest distance R min from an arbitrary internal position to the outer surface. The minimum distance among the distances from any outer surface to the farthest position inside is included in R min . The farthest position inside from the outer surface is located on the center line CL in the thickness direction of the pillow (the center line of the pillow at a height of 1 / 2 of the thickness).

[0022] <R min Relationship between Td and R> When the target drying time is set to 24 hours, the drying thickness Td is within 50 mm. At this time, if the shortest distance R min from all internal positions to the outer surface satisfies Td / 2 which is 1 / 2 of the drying thickness Td, it is considered that the drying property is good. The shortest distance R min from all internal positions to the outer surface of the pillow is within 1 / 2 of the drying thickness Td (Td / 2) that dries within a certain period of time (R min ≦ Td / 2).

[0023] The shortest distance R from all internal positions to the outer surface of the pillow of the present invention min is within 25 mm. That is, the shortest distance R min from the internal position to the outer surface is within 25 mm from the viewpoint of drying property, preferably within 20 mm, more preferably within 17.5 mm, still more preferably within 15 mm, and particularly preferably within 10 mm.

[0024] <T max Relationship between T and R min > Maximum pillow thickness T max This is the maximum thickness T from the base surface 1b to the top surface 1a. For example, if the base surface 1b is flat and the top surface 1a is curved upwards in a convex shape, the distance from the base surface 1b to the convex curved portion is the maximum thickness T. max Therefore, the pillow of the present invention satisfies the following relationship. Maximum thickness T max The shortest distance R from the inside to the outer surface is the distance R from the inside to the outside. min Larger than twice (T max > 2×R min ).

[0025] The features of this invention are summarized below.

[0026] The pillow 1 of the present invention has an outer surface including a top surface 1a on which the user's head rests, and a bottom surface 1b opposite to the top surface 1a, and the shortest distance R from all positions inside to the outer surface. min However, it is less than half of the dry thickness Td at which the moisture content reaches 0 wt% within a certain period of time. Here, the dry thickness Td is the thickness T of a plate-shaped test piece made of polyurethane foam with varying thicknesses, when dried under certain conditions until the moisture content reaches 0 wt%.

[0027] The pillow 1 of the present invention comprises a top surface 1a and a bottom surface 1b, and a plurality of first grooves 10 are formed on the top surface 1a or the bottom surface 1b at predetermined intervals i1, and each of the plurality of first grooves 10 extends from the top surface 1a or the bottom surface 1b toward the interior of the pillow 1 to the maximum thickness T of the pillow max Reaching half of the plane (the plane containing the center line CL), the predetermined interval i1 is the shortest distance R from all internal positions to the outer surface. min It is less than twice that amount.

[0028] The first groove 10 has opposing first inner surfaces 11 and second inner surfaces 12. The first inner surface 11 and the second inner surface 12 each form a wall surface of the first groove 10. Among the multiple first grooves 10, the minimum distance between the wall surfaces of adjacent first grooves 10 is 10 mm or more.

[0029] Both the top surface 1a and the bottom surface 1b extend in the width direction W and the front-to-back direction L intersecting the width direction W, and the plurality of first grooves 10 are provided on the top surface 1a and extend along the width direction W, or on the bottom surface 1b and extend along the width direction W.

[0030] The following will be explained based on the examples provided. <Example 1> In Figure 2, arrow W corresponds to the width direction of pillow 1, arrow L corresponds to the front-to-back direction, and arrow H corresponds to the height direction. The width direction W of pillow 1 roughly coincides with the width direction of the mattress or futon. Also, the front-to-back direction L of pillow 1 roughly coincides with the length direction of the mattress or futon. Note that in the front-to-back direction L, the side that supports the user's neck when pillow 1 is in use is described as the front, and the side that supports the area near the top of the head on the opposite side of the front is described as the back.

[0031] Pillow 1 has a roughly rectangular shape. Pillow 1 has a top surface 1a on which the user's head rests, a bottom surface 1b located opposite to the top surface 1a, and left end surface 1c, right end surface 1d, front end surface 1e, and rear end surface 1f connecting the top surface 1a and the bottom surface 1b. The thickness T of pillow 1 is the thickness in the thickness direction H and is the distance from the bottom surface 1b to the top surface 1a.

[0032] Pillow 1 is a block shape formed such that, for example, the width W dimension is 400 mm or more and 700 mm or less, the front-to-back L dimension is 300 mm or more and 500 mm or less, and the maximum thickness H dimension is 30 mm or more and 90 mm or less. The pillow was made by processing the polyurethane foam used in the wash-and-dry test into a predetermined shape.

[0033] The top surface 1a may be flat or curved to conform to the shape of the user's head. In this embodiment, the top surface 1a is also formed as a flat surface in the central part where the user's head rests. The size in the thickness direction H (thickness T of the pillow 1) is largest in both the central and peripheral parts, and the maximum thickness is T. max That is the case.

[0034] The top surface 1a includes a first end W1 and a second end W2 opposite to the first end W1 in the width direction W. In the front-to-back direction L, the top surface 1a includes a first end L1 on the front side and a second end L2 on the rear side opposite to the first end L1.

[0035] As shown in Figures 2 and 3, the pillow 1 is provided with a first groove 10 on the top surface 1a or the bottom surface 1b.

[0036] The first groove 10 is, for example, a straight groove extending along the width direction W. The first groove 10 extends from the first end W1 to the second end W2 of the pillow 1 in the width direction W.

[0037] <1st groove> As shown in Figure 3, the first groove 10 is defined in the front-to-back direction L by opposing first inner surfaces 11 and second inner surfaces 12, and a bottom surface 13 connecting the first inner surfaces 11 and the second inner surfaces 12. The bottom 13a of the first groove 10 is the point closest to the bottom surface 1b of the bottom surface 13 in the thickness direction H. In this embodiment, the first inner surfaces 11 and the second inner surfaces 12 are vertical walls extending in the width direction W and thickness direction H, parallel to each other, and the bottom surface 13 smoothly connects the first inner surfaces 11 and the second inner surfaces 12. However, the first inner surfaces 11 and the second inner surfaces 12 may also be inclined with respect to the thickness direction H.

[0038] <Groove width> The groove width of the first groove 10 is the distance between the first inner surface 11 and the second inner surface 12 that face each other in the same groove. From the viewpoint of drying properties, the groove width of the first groove 10 is preferably 5 mm or more, more preferably 8 mm or more, and particularly preferably 10 mm or more.

[0039] <Outer surface> The space between the opposing first inner surface 11 and second inner surface 12 of the first groove 10 extends to the outer surface of the top surface 1a or the bottom surface 1b. The first groove 10 helps the pillow dry. For this reason, the outer surface of the pillow includes the opposing inner surfaces of the groove in addition to the substantially rectangular parallelepiped surface of the pillow. That is, the outer surface includes the top surface 1a, the bottom surface 1b, the left end surface 1c, the right end surface 1d, the front end surface 1e, and the rear end surface 1f, as well as the first inner surface 11 and the second inner surface 12, which are the inner surfaces of the groove, and the bottom surface 13.

[0040] Multiple first grooves 10 are provided at intervals in the front-rear direction L. In this embodiment, the first grooves 10 include a first transverse groove 10a, a second transverse groove 10b, and a third transverse groove 10c. The number of first grooves 10 can be appropriately changed depending on the size, shape, or desired drying properties of the pillow 1.

[0041] <Groove spacing> The first transverse grooves 10a to the third transverse grooves 10c are arranged at equal intervals in the front-to-back direction L, but are not limited to this and may be arranged at different intervals. In this embodiment, the first transverse grooves 10a to the third transverse grooves 10c are arranged such that the shortest distance R from all internal positions to the outer surface in the front-to-back direction L is... min They are arranged at equal intervals with a gap i1 of less than twice the distance between them. Multiple first grooves 10 are provided on the top surface 1a at predetermined intervals i1. The first grooves 10 are positioned at predetermined distances (T21, T22) from the ends of the pillow (the front first end L1 or the rear second end L2).

[0042] <First convex piece and its thickness> Multiple first grooves 10 are provided on the top surface 1a. The multiple first grooves 10 are arranged in a line from the end of the pillow (the front first end L1 or the rear second end L2) with a predetermined interval i1 between them. A first protrusion 20 is formed by forming multiple first grooves 10 on the top surface 1a or the bottom surface 1b. The first protrusion 20 is formed in the portion sandwiched between the multiple first grooves 10 extending from the top surface 1a or the bottom surface 1b. Furthermore, a first protrusion 20 is also formed in the portion sandwiched between the first grooves 10 and the front first end L1 or the rear second end L2.

[0043] The upper surface of the first protrusion 20 on the thickness direction H side of the pillow is the top surface 1a of the pillow. The bottom surface of the first protrusion 20 on the opposite side of the thickness direction H side of the pillow is connected to the inside of the pillow. The shape of the first protrusion 20 may have a rounded or inclined edge on its upper surface. The first protrusion 20 is defined by two adjacent first grooves 10. The vertical walls (inner surfaces) of adjacent first grooves 10 are common to the vertical walls (outer surfaces) of the first protrusion 20. Each adjacent first groove 10 has an opposing first inner surface 11 and a second inner surface 12. The first protrusion 20 is sandwiched between the second inner surface 12 of the first groove 10 and the first inner surface 11 of the adjacent first groove 10. The thickness T20 of the first protrusion 20 is the distance between the groove walls of the adjacent first grooves 10 that sandwich the first protrusion 20 (the walls of the first inner surface 11 and the second inner surface 12 of the adjacent first groove 10). The thickness of the first protrusion 20 is usually shorter by the groove width than the groove spacing (first spacing i1) of the first grooves 10.

[0044] The thickness T20 of the first protrusion 20, which is the distance between the groove walls of the first groove 10, is the shortest distance R from the outer surface. min It is less than twice that. Specifically, the thickness T20 of the first convex piece 20 is 50 mm or less, preferably 40 mm or less, more preferably 35 mm or less, more preferably 30 mm or less, and particularly preferably 20 mm or less. On the other hand, the minimum distance between groove walls or the thickness T20 of the first protrusion 20 is preferably 10 mm or more from the viewpoint of preventing tearing during washing. Note that this minimum distance between groove walls applies not only to the thickness T20 of the first protrusion 20, but also to the groove walls of different first protrusions 20 (first inner surface 11 or second inner surface 12).

[0045] <Groove depth> The first groove 10, located on the top surface 1a or bottom surface 1b, is formed to have a first groove depth d1 in the thickness direction H. The first groove depth d1 is the distance between the bottom 13a of the first groove 10 located on the top surface 1a or bottom surface 1b and the top surface 1a or bottom surface 1b in the thickness direction H. In this embodiment, the first groove depth d1 is the maximum thickness T of the pillow. maxIt is set to more than 1 / 2 of the thickness. The first groove 10 reaches at least to the center of the pillow's thickness (the surface where the center line CL of 1 / 2 of the thickness T connects). The shortest distance R in the front-to-back direction L. min The first groove depth d1 of the multiple first transverse grooves 10a, which are arranged at intervals i1 of less than twice the maximum thickness T of the pillow, is equal to the maximum thickness T of the pillow. max It is more than half of the thickness T. The plane with half the thickness T is the plane formed by connecting the centerlines of each half the thickness T from the top surface 1a to the bottom surface 1b.

[0046] If the spacing i1 of the first groove 10 is further narrowed, the depth d1 of the first groove becomes the maximum thickness T of the pillow. max It may be less than half of the maximum thickness of the pillow. max However, if it is 80mm or less, the first groove depth d1 is equal to the maximum thickness T of the pillow. max If it's 1 / 2 of that, then the center line of the pillow (T max The shortest distance R from the plane passing through / 2 to the outer surface min The size must be within 40mm.

[0047] <Shortest distance to the outer surface> As described above, for the region enclosed by the top surface 1a, bottom surface 1b, left end surface 1c, right end surface 1d and the multiple first grooves 10 (the region enclosed by the multiple first protrusions 20) of the pillow, the shortest distance R from the internal position to the outer surface is min However, the drying thickness Td must be within half of the drying thickness Td that can be dried within a certain period of time. This "within half of the drying thickness Td (Td / 2)" means, for example, the following: If the drying thickness Td that can be dried within 24 hours is 50 mm or less, then it must be within 25 mm. If the drying thickness Td that can be dried within 16 hours is 20 mm or less. If the drying thickness Td that can be dried within 11 hours is 17.5 mm or less. If the drying thickness Td that can be dried within 10 hours is 15 mm or less. If the drying thickness Td that can be dried within 6 hours is 10 mm or less.

[0048] <Example 2> Next, with reference to Figure 4, we will describe the configuration of Embodiment 2 of this disclosure, which mainly differs from the pillow 1 of Embodiment 1.

[0049] In this embodiment, a plurality of first transverse grooves 10a are arranged in the front-to-back direction L at predetermined intervals i1. The interval i1 is the shortest distance R to the outer surface. min It is less than twice that. The groove depth (second groove depth d2) of the multiple first transverse grooves 10a is (maximum pillow thickness T max -Shortest distance R to the outer surface min ) That is all. With such a groove depth, the shortest distance R from all internal positions to the outer surface is... min It is even more preferable that the moisture content of the pillow be within half of the dry thickness Td, which is achieved by drying within a certain period of time. Therefore, in this case, the moisture content of the pillow can be reduced to 0 wt% within a certain period of time. Specifically, the shortest distance R min By keeping the thickness within 25mm, it becomes possible to achieve a moisture content of 0 wt% 24 hours after washing.

[0050] The second groove depth d2 is the distance between the bottom 13a and the top surface 1a of the first groove 10, and is longer than the first groove depth d1. In this embodiment, each second groove depth d2 is equal. However, each second groove depth d2 is at least equal to the maximum thickness T of the pillow. max It is sufficient that it be at least half of the total, and each may be formed in a different size.

[0051] <Example 3> Next, with reference to Figure 5, we will describe the configuration of Embodiment 3 of this disclosure, mainly explaining the differences from the pillow 1 of Embodiments 1 and 2.

[0052] The pillow 1 comprises a first groove 10 provided on the top surface 1a and the bottom surface 1b.

[0053] The first groove 10 is, for example, a straight groove extending along the width direction W. The first groove 10 extends from the first end W1 to the second end W2 of the pillow 1 in the width direction W.

[0054] The first groove 10 on the bottom surface 1b is provided between the first grooves 10 provided on the top surface 1a. Adjacent first grooves 10 on the top surface 1a have opposing first inner surfaces 11 and second inner surfaces 12 in the front-to-back direction L. The first groove 10 on the bottom surface 1b is provided between the second inner surface 12, which is one of the vertical walls of the first groove 10 on the top surface 1a, and the first inner surface 11, which is one of the vertical walls of the adjacent first groove 10 on the top surface 1a.

[0055] As described above, the first groove 10 can be provided alternately on the top surface 1a and the bottom surface 1b. This is advantageous in terms of improving drying properties.

[0056] The groove width of the first groove 10, the first groove depth d1, the second groove depth d2, the groove spacing i1, and the thickness T20 of the first protrusion 20 may be the same as in Examples 1 and 2.

[0057] <Example 4> Next, using Figures 6 and 7, we will describe the configuration of Embodiment 4 of this disclosure, mainly explaining the differences from Pillow 1 of Embodiments 1 to 3.

[0058] In this embodiment, for example, a block-shaped pillow 1 with a width W of 630 mm, a front-to-back dimension of 430 mm, and a maximum thickness H of 80 mm will be described as an example.

[0059] The pillow 1 includes a top surface 1a on which the user's head rests, and a bottom surface 1b located opposite the top surface 1a. In this embodiment, the top surface 1a is also formed as a flat surface in the central part on which the user's head rests. The size in the thickness direction H (thickness T of the pillow 1) is largest in both the central and peripheral parts, with a maximum thickness T max It is 80mm.

[0060] The first groove 10, which is a straight groove extending along the width direction W, extends from the first end W1 to the second end W2 of the pillow 1 in the width direction W.

[0061] Multiple first grooves 10 are provided at intervals i1 in the front-rear direction L. The number of first grooves 10 can be appropriately changed depending on the size, shape, or desired drying properties of the pillow 1.

[0062] The first grooves 10 are provided on the top surface 1a and the bottom surface 1b. In this embodiment, six first grooves 10 are provided on the top surface 1a and seven first grooves 10 are provided on the bottom surface 1b.

[0063] In this embodiment, multiple first grooves 10 are provided on the bottom surface 1b between multiple first grooves 10 provided on the top surface 1a. Adjacent first grooves 10 on the top surface 1a have opposing first inner surfaces 11 and second inner surfaces 12 in the front-rear direction L. A first groove 10 on the bottom surface 1b is provided facing the vertical walls of the second inner surface 12 of the first groove 10 on the top surface 1a and the first inner surface 11 of the adjacent first groove 10 on the top surface 1a.

[0064] <Groove depth> In this embodiment, the groove depths of the first groove 10 are 40 mm and 55 mm. On the top surface 1a, a first groove 10 is formed with a second groove depth d2 of 55 mm in the thickness direction H. Shallow first grooves 10 are arranged at both ends of the bottom surface 1b, and a deep first groove 10 is arranged in the central part other than these. The first grooves 10 located at both ends of the bottom surface 1b are formed with a first groove depth d1 of 40 mm in the opposite direction of the thickness direction H. The first grooves 10 located other than at both ends of the bottom surface 1b are formed with a second groove depth d2 of 55 mm in the opposite direction of the thickness direction H.

[0065] The first groove 10 extends from the top surface 1a beyond the internal centerline CL and has a second groove depth d2 of 55 mm. From the bottom surface 1b toward the internal centerline CL, the first groove 10 has a second groove depth d2 of 55 mm and a first groove depth d1 of 40 mm. The bottom 13a of the first groove 10 having a first groove depth d1 is located on the internal centerline CL (a line with a thickness of T / 2).

[0066] The bottom 13a of each first groove 10 is located in the central region CA which includes the center line CL (a line with a thickness of T / 2). Multiple first grooves 10 are arranged such that the bottom 13a of each first groove 10 is located from the outer surface, including the top surface 1a and bottom surface 1b, toward the center line CL inside the pillow. The central region CA is the region formed by connecting the positions of the bottoms 13a of each first groove 10. The central region CA is formed by connecting the positions of the bottoms 13a of each first groove 10 in an elliptical shape so that the area of ​​the central region CA is as large as possible. In this embodiment, six first grooves 10 from the top surface 1a and seven first grooves 10 from the bottom surface 1b intersect or touch the center line CL (a line with a thickness of T / 2) within the central region CA. Multiple first grooves 10 are contained within the central region CA, and the first inner surface 11, second inner surface 12, and bottom surface 13 of each groove are connected to the space on the outer surface, resulting in excellent drying properties.

[0067] In this embodiment, the groove width of the first groove 10 is 10 mm, and the groove spacing i1 is 60 mm. The distance L in the front-to-back direction from the front first end L1 or the rear second end L2 to the first groove 10 (T21 or T22) is 30 mm. The thickness T20 of the first protrusion 20 is 50 mm. The distance between the top surface 1a and the bottom 13a of the first groove 10 extending from the bottom surface 1b is 25 mm. The distance between the bottom surface 1b and the bottom 13a of the first groove 10 extending from the top surface 1a is 25 mm. The distance between the vertical wall of the first groove 10 extending from the top surface 1a and the vertical wall of an adjacent first groove 10 extending from the bottom surface 1b is 20 mm.

[0068] In this embodiment, the pillow is formed such that multiple first grooves 10 extend alternately from the top surface 1a and the bottom surface 1b (Figure 6). Multiple first protrusions 20 sandwiched in the first grooves 10 are arranged like a continuous zigzag-shaped plate, alternately facing the top surface 1a and the bottom surface 1b (Figure 6). The multiple first protrusions 20 share the same surfaces as the outer surface of the pillow: the top surface 1a, the bottom surface 1b, the left end surface 1c, the right end surface 1d, the front end surface 1e, the rear end surface 1f, and also the first inner surface 11 and the second inner surface 12 of the first groove 10. The distance between two opposing surfaces of the first protrusions 20 corresponds to the thickness of the zigzag-shaped connected plate, and as discussed above, it is between 20 mm and 25 mm. Therefore, the maximum distance between two opposing surfaces is 25 mm. Thus, the shortest distance R from all internal positions to the outer surface is min The thickness is 12.5 mm or less, and it has excellent drying properties.

[0069] <Example 5> Next, using Figures 8 and 9, we will describe the configuration of Embodiment 5 of this disclosure, mainly explaining the differences from Pillow 1 of Embodiments 1 to 4.

[0070] The pillow 1 includes a top surface 1a on which the user's head rests, and a bottom surface 1b located opposite the top surface 1a. In this embodiment, the top surface 1a is formed with a curved surface in the central part on which the user's head rests, conforming to the shape of the user's head. In this embodiment, the top surface 1a is formed with a curved surface in the central part on which the user's head rests, and the size in the thickness direction H (thickness T of the pillow 1) is greatest at the periphery of the top surface away from the center, with a maximum thickness T max It is 80mm.

[0071] In this embodiment, the shape of the top surface 1a differs from that of Embodiment 4, and consequently, the shapes of the left end surface 1c and the right end surface 1d on the side of the top surface 1a are different (Figure 8). Otherwise, the shape is the same as that of Embodiment 4. The top surface 1a is 10 mm lower than that of Embodiment 4 at the center in the front-to-back direction L. The thickness between the top surface 1a and the bottom surface 1b varies in the front-to-back direction L, with a thickness T of 70-80 mm.

[0072] The groove width of the first groove 10, the groove spacing i1, the distances from the outer surface to the first groove 10, and the distance between the first inner surface 11 and the second inner surface 12 of the first groove 10 are basically the same as in Example 4. However, since the top surface 1a is a slightly concave curved surface, the distance between the bottom 13a of the first groove 10 extending from the bottom surface 1b in the direction of the top surface 1a and the top surface 1a is 15 to 25 mm.

[0073] The distance between two opposing faces of the first protrusion 20 is between 15 mm and 25 mm. Therefore, the maximum distance between the two opposing faces is 25 mm. Thus, the shortest distance R from all internal positions to the outer surface is... min It has a thickness of 12.5 mm and dries very well.

[0074] <Example 6> Next, using Figure 10, we will describe the configuration of Embodiment 6 of this disclosure, mainly focusing on the differences from Pillow 1 of Embodiments 1 to 5.

[0075] In this embodiment, for example, a block-shaped pillow 1 with a width W of 630 mm, a front-to-back dimension of 430 mm, and a maximum thickness H of 80 mm will be described as an example.

[0076] Similar to Example 5, the top surface 1a of this embodiment is formed as a curved surface with a slightly concave central portion where the user's head rests, and the size in the thickness direction H (thickness T of the pillow 1) is greatest at the periphery of the top surface, away from the center.

[0077] In previous embodiments, the first groove 10 was formed vertically or in the opposite direction from the top surface 1a or bottom surface 1b. In Embodiment 6, the first groove 10 is formed diagonally from the outer surface side to the bottom 13a. In Embodiment 6, the first inner surface 11 and the second inner surface 12 of the first groove 10 are inclined with respect to the thickness direction H.

[0078] Furthermore, the inclination angles of the first inner surface 11 or the second inner surface 12 with respect to the thickness direction H may be different. The first inner surface 11 and the second inner surface 12 may no longer be parallel, and the groove width may narrow as they go further into the first groove 10, or the groove width may widen before they connect at the bottom surface 13 of the groove.

[0079] Starting from the first front end L1 of the top surface 1a, multiple first grooves 10 are formed in an oblique direction toward the interior downwards. Starting from the center in the front-to-back direction L, multiple first grooves 10 are formed in an oblique direction toward the interior downwards, starting from the second rear end L2 of the top surface 1a. Similarly, starting from the first front end L1 of the bottom surface 1b, multiple first grooves 10 are formed in an oblique direction toward the interior upwards. Starting from the center in the front-to-back direction L, multiple first grooves 10 are formed in an oblique direction toward the interior upwards, starting from the second rear end L2 of the top surface 1a.

[0080] The first groove 10 on the bottom surface 1b is provided between the first grooves 10 provided on the top surface 1a. Adjacent first grooves 10 on the top surface 1a have opposing first inner surfaces 11 and second inner surfaces 12 in the front-rear direction L. The first groove 10 on the bottom surface 1b is provided facing the space between the inclined vertical walls of the second inner surface 12 of the first groove 10 on the top surface 1a and the first inner surface 11 of the adjacent first groove 10 on the top surface 1a.

[0081] In this embodiment, multiple first grooves 10 are formed on the bottom surface 1b, slanted upwards. As shown in Figure 10, the slope of the first inner surface 11 of the first groove 10 is 40 mm in height for every 15 mm of base. The slope of the second inner surface 12 of the first groove 10 is 40 mm in height for every 30 mm of base. The pair of vertical walls (first inner surface and second inner surface) of each first groove 10 extend diagonally, and are located at a height (maximum thickness T) 40 mm inward from the bottom surface 1b in the thickness direction H. max The bottom 13a is connected at the center line CL. Similarly, each first groove 10 on the top surface 1a is connected at a height of 40 mm in the thickness direction H from the top surface 1a (maximum thickness T). maxThe base 13a is connected at the center line CL. Ten first grooves 10 are formed on the top surface 1a and the bottom surface 1b. On the surface (maximum thickness T) that extends 40 mm inward in the thickness direction H from the bottom surface 1b. max Twenty bottoms 13a of the first groove 10 are arranged along the center line CL. The spacing between adjacent bottoms 13a of the first groove 10 is less than 20 mm (approximately 19.5 mm).

[0082] In this embodiment, the groove width of the first groove 10 is formed with a width of 15 mm on the top surface 1a or the bottom surface 1b. The groove spacing i1 is 40 mm on the top surface 1a or the bottom surface 1b. The length T20 of the first protrusion 20 on the top surface 1a or the bottom surface 1b is 25 mm. The distance L in the front-to-back direction (T21 or T22) from the first end L1 on the front side and the second end L2 on the rear side to the first groove 10 is 37.5 mm. However, because the first groove 10 is inclined at an angle, the distance L in the front-to-back direction decreases as you move into the interior of the pillow. Regarding the thickness of the first protrusion 20, the distance L in the front-to-back direction (T20) is 25 mm on the bottom surface 1b. The distance L in the front-to-back direction of the first protrusion 20 at a height (center line CL) of 40 mm thickness inside the pillow is less than 20 mm (approximately 19.5 mm). This is because the first groove 10 is positioned at an angle.

[0083] Since the bottom 13a of the first groove 10 fits into the center line CL, the distance between the two opposing surfaces of the first protrusion 20 (corresponding to the thickness of the first protrusion 20) is less than 25-38.5 mm. Therefore, the pillow of Example 6 has the shortest distance R from all internal positions to the outer surface. min It is smaller than 19.3mm and has excellent drying properties.

[0084] The description of the examples is complete. The following features may be added to the pillow of the present invention.

[0085] The pillow 1 may have a second groove 30 instead of the first groove 10 on its top surface 1a or bottom surface 1b. The second groove 30 is, for example, a straight groove extending along the front-rear direction L. The second groove 30 extends in the front-rear direction L from the first front end L1 to the second rear end L2 of the pillow 1.

[0086] Furthermore, the pillow 1 may have one or more grooves, both the first groove 10 and the second groove 30, on its top surface 1a or bottom surface 1b.

[0087] The spacing between the first groove 10 or the second groove 30 located on the pillow 1 can be partially enlarged or reduced. The depth of the grooves can also be changed in different locations.

[0088] Although embodiments of this disclosure have been described above, this disclosure is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. In particular, the various modifications described herein can be combined as needed. [Explanation of Symbols]

[0089] 1: Pillow 1a: Top surface 1b: Bottom 1c: Left end surface 1d: Right end face 1e: Front end face 1f: Rear end surface T: Pillow thickness (distance from the bottom to the top) T max : Maximum thickness of the pillow (distance from the bottom to the top) W1: 1st end W2: Second end L1: Front first end L2: Second end on the rear side 10: First trench (cross trench) d1: First groove depth (maximum thickness T) max (Groove depth of 1 / 2 or more) d2: Second groove depth ((Maximum thickness T) max -Shortest distance R to the outer surface min (Groove depth greater than or equal to) 11: 1st inner surface 12: Second inner surface 13: Bottom part 13a: Bottom i1: First interval 20: First convex piece...the portion sandwiched by the first groove extending from the top or bottom surface T20: Thickness of the first protrusion... (distance between two opposing grooves) T21: Distance from the left end face to the first convex piece. T22: Distance from the right end face to the first convex piece. Td: Dry thickness at which the moisture content reaches 0 wt% after a certain period of time. CL: Center line CA: central area W: Width direction L: Front-back direction H: Thickness direction R min : The shortest distance from any internal location to the external surface.

Claims

1. Maximum thickness T ｍａｘ It is a pillow, The shortest distance R from any internal location to the outer surface. ｍｉｎ It is within 25 mm, The maximum thickness must be greater than twice the shortest distance from any point inside to the outer surface (T ｍａｘ A pillow characterized by satisfying (2 × Rmin).

2. The pillow according to claim 1, which is made of foam.

Images