JP2024042980A - seat cushion - Google Patents

Abstract

[Problem] To provide a seat cushion that is not easily stuffy, is comfortable to sit on, has excellent durability, and also suppresses the trampoline phenomenon and has excellent holding power. [Solution] The seat cushion is constructed using cushion members, namely a center cushion formed of a three-dimensional filament bond, a left side cushion disposed on the left side of the center cushion, and a right side cushion disposed on the right side of the center cushion, and supports the user's buttocks with its upper surface, in which the repulsive force of the center cushion during compression is smaller than the repulsive force of the left side cushion and the repulsive force of the right side cushion during compression, and the high-density smooth surface layers formed on the upper parts of the cushion members are adjacent to each other in the left-right direction. [Selected Figure] Figure 6

Description

The present invention relates to seat cushions for vehicles such as automobiles and wheelchairs.

Seat cushions used in vehicle seats are required to be able to withstand the body's resistance to falling in the direction of centrifugal force when the vehicle goes around a curve (hereinafter sometimes referred to as "holdability"). For example, Patent Document 1 discloses a seat cushion that enhances holdability by placing a soft cushion in the center of the seat and hard cushions on both sides. However, the seat cushion in Patent Document 1 uses urethane foam, which has low breathability, as the cushion material, which causes problems such as the cushion becoming stuffy during hot seasons such as summer.

Furthermore, in recent years, attention has been paid to a cushion material made of a three-dimensional filament assembly in which a plurality of thermoplastic resin filaments are three-dimensionally fused and bonded. For example, Patent Document 2 describes a method for manufacturing a three-dimensional composite of filaments (network structure) provided with a high-density smooth surface layer. Such a three-dimensional composite of filaments has a high porosity and excellent air permeability, so it has the advantage of being hard to get stuffy and easy to wash with water.

Japanese Unexamined Patent Publication No. 137732/1986 Patent No. 4966438

By considering the above-mentioned points and using a three-dimensional composite of filaments, it is possible to obtain a seat cushion that does not get stuffy easily. Furthermore, by providing a high-density smooth surface layer on the surface of the three-dimensional filament assembly, the surface becomes smooth and comfortable to sit on, while at the same time the surface of the three-dimensional filament assembly becomes stronger and durability is improved. There is expected.

On the other hand, when a three-dimensional filament bond with a high-density smooth surface layer is used as a seat cushion material to improve breathability and durability, there is a problem that the pressure in the center of the buttocks increases significantly, further reducing the holding ability. The mechanism by which the high-density smooth surface layer further reduces the holding ability is explained below with reference to Figures 15 and 16.

FIG. 15 is a cross-sectional view of a seat cushion 200 made of a three-dimensional composite of filaments with a high-density smooth surface layer provided on the surface. The seat cushion 200 is a substantially rectangular parallelepiped cushion formed of a three-dimensional combination of filaments, and has an upper high-density smooth surface layer 200a and a lower high-density smooth surface layer 200a and a lower surface on the upper surface corresponding to the side on which the user sits and the lower surface on the opposite side, respectively. A side high-density smooth surface layer 200b is formed.

FIG. 16 is a cross-sectional view showing how the seat cushion 200 is pushed by the buttocks B and deformed by the user sitting on the seat cushion 200. As schematically shown by arrows F1 to F3, the pressure that the buttocks B receives from the seat cushion 200 is greatest near the central region (more precisely, the ischial region) where the buttocks B sinks the deepest (see arrow F1). (see arrow F3), becomes smaller in the vicinity of both left and right ends where the buttocks B sinks only shallowly (see arrow F3).

The cause of the difference in pressure in the left-right direction as shown by arrows F1 to F3 is that the filament three-dimensional combination is an elastic body.In other words, the deeper the sinking, the greater the pressure, and the shallower the sinking, the greater the pressure. This is due to the fact that the In a filament three-dimensional composite with a high-density smooth surface layer on the surface, the tension T1 of the high-density smooth surface layer causes a strong lifting force at the center of the buttocks (more precisely, at the ischial bone that forms a downward protrusion). As a result, a phenomenon occurs in which the pressure received from the seat cushion 200 increases near the center of the buttocks (hereinafter sometimes referred to as the "trampoline phenomenon"). As a result, it becomes difficult for the buttocks to roll from side to side using the vicinity of the center of the buttocks as a fulcrum, resulting in a significant decrease in holding performance.

In view of the above-mentioned problems, it is an object of the present invention to provide a seat cushion that does not get stuffy, is comfortable to sit on, has excellent durability, suppresses the trampoline phenomenon, and has excellent holdability.

The seat cushion according to the present invention is constructed using cushion members, namely a center cushion formed of a three-dimensional filament bond, a left side cushion disposed on the left side of the center cushion, and a right side cushion disposed on the right side of the center cushion, and supports the user's buttocks with its upper surface, in which the repulsive force of the center cushion during compression is smaller than the repulsive force of the left side cushion and the repulsive force of the right side cushion during compression, and the high-density smooth surface layers formed on the upper parts of the cushion members are adjacent to each other in the left-right direction.

According to this configuration, it is possible to provide a seat cushion that does not get stuffy, is comfortable to sit on, has excellent durability, suppresses the trampoline phenomenon, and has excellent holdability. Note that the left-right direction of the seat cushion substantially coincides with the direction of the user's buttock width. In addition, the "high-density smooth surface layer" is a layer that extends to a depth of 0.5 cm from the surface of the three-dimensional filament assembly, and has a higher bulk density than the inside of the layer, and is located at the ends of the filaments (cut ends of cut filaments). etc.) refers to a layer that does not protrude outward from the surface.

More specifically, the right side of the left side cushion may be inclined downwards as it moves to the right and be in surface contact with the left side of the center cushion while the left side of the right side cushion may be inclined downwards as it moves to the left and be in surface contact with the right side of the center cushion while being in surface contact with the right side of the center cushion. Note that the "mating state" refers to a state in which, in two filament three-dimensional combinations that are in surface contact with each other, the tip of a filament protruding from the surface of one filament three-dimensional combination is stuck inside the other filament three-dimensional combination (into the inside from the surface).

More specifically, in the above configuration, the right side surface of the left side cushion is inclined in a downward direction as it moves to the left, and is in surface contact with the left side surface of the center cushion. The surface may be inclined in a downward direction as it moves to the right, and may be in surface contact with the right side surface of the center cushion.

More specifically, the above configuration is such that the density of the high-density smooth surface layer of the center cushion is smaller than the density of the high-density smooth surface layer of the left side cushion and the density of the high-density smooth surface layer of the right side cushion. It's good as well. Note that the "density of the high-density smooth surface layer" refers to the bulk density of the high-density smooth surface layer.

More specifically, the above configuration is such that the left side surface of the high-density smooth surface layer of the center cushion and the right side surface of the high-density smooth surface layer of the left side cushion are fixed by being fused, and the center The right side surface of the high-density smooth surface layer of the cushion and the left side surface of the high-density smooth surface layer of the right side cushion may be fixed by being fused.

More specifically, the above configuration includes a cushion cover to which an elongation preventing member is added, and each of the cushion members is housed in the cushion cover to maintain a state in close contact with each other, and the elongation preventing member is The cushion cover may be made of a material that is less stretchable than the material of the cushion cover, and may be arranged to surround each of the cushion members.

According to the seat cushion according to the present invention, it is possible to provide a seat cushion that does not get stuffy, is comfortable to sit on, has excellent durability, and also suppresses the trampoline phenomenon and has excellent holdability.

FIG. 1 is a perspective view of a seat cushion 1 according to a first embodiment. FIG. 1 is a cross-sectional view of the seat cushion 1 according to the first embodiment. FIG. 3 is a cross-sectional view showing how the seat cushion 1 is deformed by being pushed by the buttocks B. FIG. 1 is a schematic diagram of a manufacturing apparatus 100 for a three-dimensional filament assembly. 5 is a cross-sectional view taken along line A-A' of the manufacturing apparatus 100 shown in FIG. 4. FIG. 7 is an explanatory diagram showing an example of the form of the lower surface of the nozzle portion 116. FIG. 10 is an explanatory diagram showing an example of the configuration of the lower surface of a nozzle portion 116. FIG. FIG. 3 is a sectional view of a seat cushion 2 according to a second embodiment. 1 is a cross-sectional view showing a state in which the seat cushion 2 is pressed by the buttocks B and deformed. FIG. FIG. 3 is a sectional view of a seat cushion 3 according to a third embodiment. FIG. 4 is a sectional view of a seat cushion 4 according to a fourth embodiment. It is a sectional view of seat cushion 5 concerning a 5th embodiment. FIG. 7 is a sectional view of a seat cushion 6 according to a sixth embodiment. FIG. 13 is a cross-sectional view of a seat cushion 7 according to a seventh embodiment. 13A to 13C are cross-sectional views of a seat cushion 8 according to an eighth embodiment and its modified example. FIG. 7 is a sectional view of a seat cushion 9 according to a ninth embodiment and a modification thereof. FIG. 2 is a cross-sectional view of a seat cushion made of a three-dimensional composite of filaments with a high-density smooth surface layer provided on the surface. FIG. 16 is a cross-sectional view showing how the seat cushion shown in FIG. 15 is deformed by being pushed by the buttocks.

Each embodiment of the present invention will be described below with reference to the drawings. In the following description, the front-rear, left-right, and up-down (thickness) directions (orthogonal to each other) of the seat cushion are as shown in FIG. 1, etc. Furthermore, unless otherwise specified, a cross section of the seat cushion is a cross section obtained by cutting the seat cushion in any plane orthogonal to the front-rear direction, and a cross-sectional view of the seat cushion refers to a view showing that cross section. A cross-sectional shape of the seat cushion refers to the shape of the cross section when viewed from the front (or rear).

Note that the front-rear direction, left-right direction, and up-down direction (thickness direction) (directions perpendicular to each other) regarding the manufacturing apparatus for the three-dimensional filament assembly are as shown in FIGS. 4A and 4B. Moreover, the seat cushion of each embodiment basically has a plane-symmetrical structure with an imaginary plane that divides the seat cushion into left and right halves as a plane of symmetry.

1. First Embodiment First, a first embodiment of the present invention will be described. FIG. 1 is a perspective view of a seat cushion 1 according to the first embodiment. FIG. 2 is a sectional view of the seat cushion 1.

The seat cushion 1 includes a center cushion 11 disposed at the center in the left-right direction, a left side cushion 12 provided in surface contact with the left side of the center cushion 11, and a right side cushion 12 provided in surface contact with the right side of the center cushion 11. It is constructed using each cushion member of the side cushion 13. The seat cushion 1 has an approximately rectangular parallelepiped shape as a whole, and the upper surface 1a of the seat cushion 1 supports the user's buttocks. Note that the seat cushion 1 is basically used as a seat cushion for vehicles such as automobiles and wheelchairs, and is used so that its left and right direction substantially coincides with the direction of the width of the buttocks of the user.

The center cushion 11 is formed of a three-dimensional composite of filaments having a trapezoidal cross-sectional shape where the upper base is longer than the lower base, and has a high-density smooth surface layer on the upper surface 11a and the lower surface 11b. The left side surface 11c of the center cushion 11 descends as you move to the right at an angle of about 45 degrees from a virtual plane perpendicular to the left-right direction (hereinafter sometimes referred to as a "vertical virtual plane"). The right side surface 11d of the center cushion 11 is formed to be inclined in a downward direction when going leftward at an angle of about 45 degrees from a vertical imaginary plane.

The left side cushion 12 is formed of a three-dimensional filament assembly having a trapezoidal cross-sectional shape with an upper base shorter than the lower base, and has a high-density smooth surface layer on the upper surface 12a and the lower surface 12b. The left side surface 12c of the left side cushion 12 is formed in a planar shape perpendicular to the left-right direction, and the right side surface 12d of the left side cushion 12 is inclined downward as it moves to the right at an angle of about 45 degrees from a vertical imaginary plane. is formed.

The right side cushion 13 is formed of a three-dimensional filament assembly having a trapezoidal cross-sectional shape with an upper base shorter than the lower base, and has a high-density smooth surface layer on the upper surface 13a and the lower surface 13b. The left side surface 13c of the right side cushion 13 is formed so as to be inclined downward when proceeding to the left at an angle of approximately 45 degrees from the vertical imaginary plane, and the right side surface 13d of the right side cushion 13 is formed in a planar shape orthogonal to the left-right direction. is formed.

The contact surfaces between the center cushion 11 and the left side cushion 12 and the contact surfaces between the center cushion 11 and the right side cushion 13 are in surface contact in a fitted state. In this application, the term "engaged state" refers to two three-dimensional filament assemblies that are in surface contact with each other, such that the tip of the filament protruding from the surface of one three-dimensional assemblage touches the other three-dimensional assemblage. Refers to the state in which it is stuck inside (the state in which it has entered inside from the surface). Due to the surface contact in the interlocking state, the tips of the filaments of one three-dimensional filament combination become easily caught on the other three-dimensional combination of filaments, suppressing slippage on the contact surface and preventing unintentional sinking of the buttocks. Can prevent crowding.

In addition, in the seat cushion 1, the user can It is preferable to fix each of the cushion members 11, 12, and 13 so that they do not slip so that they do not shift when the seat cushion 1 deforms as the person sits on the seat.

For example, this fixing method may be a method of fusing the left side of the high-density smooth surface layer of the upper surface 11a of the center cushion 11 to the right side of the high-density smooth surface layer of the upper surface 12a of the left side cushion 12, and the right side of the high-density smooth surface layer of the upper surface 11a of the center cushion 11 to the left side of the high-density smooth surface layer of the upper surface 13a of the right side cushion 13, using a heating member such as a heating plate or ultrasonic plastic welder set to a temperature equal to or higher than the melting point of the thermoplastic resin of the filament three-dimensional bond. By fixing the cushion members 11, 12, and 13 in this manner, even if the seat cushion 1 is deformed by the load of the buttocks, the cushion members 11, 12, and 13 are less likely to shift from one another, making it possible to obtain stable holding properties and durability.

In addition, in this way, in order to fuse the high-density smooth surface layers on the upper side of each cushion member 11, 12, 13, and to achieve stronger fixation, the lower side height of each cushion member 11, 12, 13 is The density smooth surface layers may be fused together. That is, the left side surface of the high-density smooth surface layer on the lower surface 11b of the center cushion 11, the right side surface of the high-density smooth surface layer on the lower surface 12b of the left side cushion 12, and the high-density smooth surface layer on the lower surface 11b of the center cushion 11. The right side surface and the left side surface of the high-density smooth surface layer of the lower surface 13b of the right side cushion 13 may be fused together.

As another fixing method, each of the cushion members 11, 12, and 13 may be kept in close contact with each other by storing each of the cushion members 11, 12, and 13 in a cushion cover. By storing each of the cushion members 11, 12, and 13 in the cushion cover so that they are kept in a state of being pressed to the left and right, each of the cushion members 11, 12, and 13 can be firmly fixed to each other, making it difficult for misalignment to occur.

Further, as the cushion cover for accommodating each of the cushion members 11, 12, and 13, a cushion cover to which an elongation prevention member is added may be employed. This elongation prevention member is made of a material that is less stretchable than the material of the cushion cover (for example, general fabric) (fabric that is less stretchable than the fabric of the cushion cover, or a resin or metal fastener, etc.), and each cushion member 11, 12, and 13 are preferably arranged so as to surround them. For example, the elongation preventing member may be formed in a band shape so as to surround the cushion members 11, 12, and 13 housed in the cushion cover when viewed from above or from the front. By using a cushion cover including such an elongation preventing member, it is possible to maintain the cushion members 11, 12, 13 in close contact with each other more reliably, making it difficult for them to shift.

Note that another possible method for suppressing slippage on the contact surface is to heat the ends of the three-dimensionally bonded filament to fuse the ends on the contact surface (fusion of the ends to each other). However, if fusion is performed on a contact surface other than a high-density smooth surface layer, the density will increase and a plate-like contact surface (boundary after fusion) will be formed there, so the air permeability of the contact surface will be reduced. The repulsive force may decrease or the repulsive force may increase excessively. On the other hand, if only partial fusion is performed on the contact surface, the contact surface will easily peel off and deteriorate over long-term use. Therefore, each of the cushion members 11, 12, and 13 may be integrally molded using an apparatus 100 for manufacturing a three-dimensional composite of filaments, which will be described later. This point will be explained in detail again.

The thickness (vertical dimension) of the seat cushion 1 is preferably 50 mm or more and 200 mm or less. If the thickness is less than 50 mm, it may be difficult to obtain a good hold, and if the thickness exceeds 200 mm, the seat cushion 1 may become bulky.

The angle of inclination of the contact surfaces between the center cushion 11 and the left side cushion 12 and the contact surfaces between the center cushion 11 and the right side cushion 13 with respect to the vertical imaginary plane is preferably 30 degrees to 60 degrees. If the angle of inclination is smaller than 30 degrees, the holdability will be improved, but the feeling of pressure from the left and right sides of the buttocks will be strong, and the permissible range of the width of the buttocks will be narrowed. On the other hand, if the angle of inclination is greater than 60 degrees, there is a risk that the holdability will deteriorate.

In order to obtain good holdability in the seat cushion 1, the compression repulsion force of the center cushion 11 is made smaller than the compression repulsion force of the left side cushion 12 and the compression repulsion force of the right side cushion 13. The specific values of the compression repulsion forces of the center cushion 11, left side cushion 12, and right side cushion 13 may be appropriately determined depending on the weight of the user, the thickness of the seat cushion 1, and the like.

For example, the compression repulsion force of the center cushion 11 may be set to 50N or more and 80N or less, and the compression repulsion force of the left side cushion 12 and right side cushion 13 may be set to 100N or more and 300N or less. In order to obtain good holdability, the compression repulsion force of the left side cushion 12 and the compression repulsion force of the right side cushion 13 should be at least 1.5 times and 4 times the compression repulsion force of the center cushion 11. It is preferable to set it as below, and it is more preferable to set it as 2 times or more and 3 times or less.

Regarding the present invention, the repulsive force upon compression of each cushion member 11, 12, 13 is measured as follows. First, a loader having a disk-shaped pressure plate with a diameter of 150 mm attached to its tip is placed on the upper surface of the measurement sample. Then, this loader is lowered at a speed of 0.4167 mm/s to compress the measurement sample in the thickness direction, and when the thickness (mm) of the measurement sample after compression becomes 7.5 mm smaller than the initial thickness, the load is applied. Record the value W(N) of the load applied to the child. The value W of this load is defined as the repulsion force (N) during compression.

If the upper surface of the measurement sample is narrower than the 150 mm diameter disk-shaped pressure plate or if the upper surface of the measurement sample is not flat, the shape of the pressure plate may be changed so that it fits the upper surface of the measurement sample without any gaps. In this case, the repulsive force upon compression (N) is calculated by W x S1/S2, where W is the measured value (N), S1 is the area ( ^cm2 ) of the 150 mm diameter circle, and S2 is the horizontal cross-sectional area ( ^cm2 ) of the pressure plate.

The density of the high-density smooth surface layer of the upper surface 11a of the center cushion 11, the upper surface 12a of the left side cushion 12, and the upper surface 13a of the right side cushion 13 is preferably 5 g/ ^cm3 or more and 20 g/cm3 or ^less on average. If the average value is less than 5 g/ ^cm3 , the smoothness and strength are likely to decrease, while if it exceeds 20 g/ ^cm3 , the surface tension is likely to increase and the trampoline phenomenon is likely to occur. In this embodiment, the density of the high-density smooth surface layer on the upper side of the center cushion 11 may be set to be smaller than the density of the high-density smooth surface layer on the upper side of the left side cushion 12 and the density of the high-density smooth surface layer on the upper side of the right side cushion 13.

There are no particular limitations on the density of the high-density smooth surface layers of the lower surface 11b of the center cushion 11, the lower surface 12b of the left side cushion 12, and the lower surface 13b of the right side cushion 13, but the average value is preferably 25 g/ ^cm3 or more and 50 g/ ^cm3 or less. If the average value is less than 25 g/ ^cm3 , it will be difficult to obtain sufficient strength, while if it exceeds 50 g/ ^cm3 , there is a risk of reduced breathability.

Furthermore, in the present application, the high-density smooth surface layer is a layer extending to a depth of 0.5 cm from the surface of the three-dimensional filament assembly, and has a higher bulk density than the inside thereof, and is a layer that extends to a depth of 0.5 cm from the surface of the three-dimensional filament assembly, and has a higher bulk density than the inside of the layer. Refers to a layer in which the cut edges, etc.) do not protrude outward from the surface. Furthermore, the density of the high-density smooth surface layer refers to the bulk density of the high-density smooth surface layer. To determine the density of a high-density smooth surface layer, prepare a measurement sample by cutting the surface to be measured to a thickness of 0.5 cm, and divide the weight (g) of the measurement sample by the volume (cm ³ ) of the measurement sample. It is calculated by The volume (cm ³ ) of the measurement sample can be calculated by multiplying the top surface area (cm ² ) of the measurement sample by the thickness of 0.5 (cm).

In this embodiment, the seat cushion 1 has a rectangular parallelepiped shape, but the seat cushion may be made into an irregular shape by changing the thickness in the front and rear direction or providing unevenness on the surface, as long as the effect of the present invention is not impaired. good.

Figure 3 is a cross-sectional view showing the state when a user sits on the seat cushion 1 and the seat cushion 1 is pressed and deformed by the buttocks B. As shown diagrammatically by arrows F1 to F3, the pressure that the buttocks B receives from the seat cushion 1 is small near the center (more precisely, the ischial region) where the buttocks B sinks deepest (arrow F1), and increases toward the user near both left and right ends where the buttocks B sinks only shallowly (arrow F3).

The seat cushion 1 is formed of a three-dimensional composite of filaments having a high-density smooth surface layer, and the center cushion 11 has a small repulsive force when compressed, and the left and right side cushions 12 and 13 have a large repulsive force when compressed. Therefore, as shown in Fig. 3, while preventing the pressure from the seat cushion 1 from increasing in the area where the seat cushion 1 sinks deeply (high compression rate) near the center of the buttocks, it sinks only shallowly near both ends of the buttocks. It becomes possible to increase the pressure from the seat cushion 1 in areas where there is no compression (low compression rate).

At the same time, since the side surfaces of the left and right side cushions 12 and 13 that contact the center cushion 11 are inclined in the left-right direction, the pressure that the buttocks B receives from the seat cushion 1 is directed from the center toward both ends in the left-right direction. Since the height can be gradually increased, the permissible range of hip width within which good holdability can be maintained becomes wider. As a result, a seat cushion 1 that does not get stuffy, is comfortable to sit on, has excellent durability, and has excellent holdability for many users with different buttock widths is realized.

FIG. 4A is a schematic diagram of a manufacturing apparatus 100 for a three-dimensional composite of filaments that can be used to manufacture the seat cushion 1. FIG. 4B is an A-A' cross-sectional view of the manufacturing apparatus 100 shown in FIG. 4A.

The apparatus 100 for manufacturing a three-dimensional filament assembly includes a molten filament supply section 110 that discharges a molten filament group MF consisting of a plurality of molten filaments having a diameter within a range of 0.3 mm to 3 mm vertically downward, and a molten filament group MF. A fusion bond forming unit 120 is provided which three-dimensionally entangles the MFs to fusion bond the contact points, and then cools and solidifies the filament to form a three-dimensional filament bond.

The molten filament supply section 110 includes a pressurized melting section 111 (extruder) and a filament discharge section 112 (die). The pressurized melting section 111 includes a material input section 113 (hopper), a screw 114, a screw motor 115 that drives the screw 114, a screw heater (not shown), and multiple temperature sensors (not shown). Inside is a cylinder 111a for transporting the thermoplastic resin or thermoplastic elastomer (hereinafter, these may be collectively referred to as "thermoplastic resin, etc.") supplied from the material input section 113 while heating and melting it with the screw heater.

A screw 114 is rotatably housed within the cylinder 111a. A cylinder outlet 111b is formed at the downstream end of the cylinder 111a for discharging thermoplastic resin or the like toward the filament discharge section 112. The heating temperature of the screw heater is controlled based on the detection signal of a temperature sensor provided in the molten filament supply section 110, for example.

The filament discharge part 112 includes a nozzle part 116, a die heater 118, and a plurality of temperature sensors (not shown), and has a channel inside that guides the molten thermoplastic resin etc. discharged from the cylinder discharge port 111b to the nozzle part 116. 112a is formed.

The nozzle part 116 is a substantially rectangular parallelepiped metal thick plate, and is provided at the lower part of the filament discharge part 112, which is the most downstream part of the flow guide path 112a. FIG. 5A shows an example of the form of the lower surface of the nozzle part 116. In this manner, a plurality of nozzle openings 116a are formed on the lower surface of the nozzle portion 116 to discharge the molten filament. As an example, the nozzle openings 116a are arranged in a staggered manner in the front, back, left and right directions, and the distance (pitch) between adjacent nozzle openings 116a is about 5 to 15 mm. In the example shown in FIG. 5A, the nozzle opening 116a has a circular cross-sectional shape with an inner diameter of 1 mm, and the distance (pitch) between adjacent nozzle openings 116a is 10 mm. However, the specific form of the nozzle opening 116a is not particularly limited.

In addition, the shape and inner diameter of each nozzle opening 116a, the interval between adjacent nozzle openings 116a, the proportion of the nozzle opening 116a on the lower surface of the nozzle part 116 (density of the nozzle opening 116a), etc. should be determined during manufacturing. It is possible to make appropriate adjustments according to the specifications of the three-dimensional filament assembly. As a result, the bulk density of the three-dimensional filament bond 3DF formed in the manufacturing apparatus 100 or the shape and diameter of the filaments constituting this can be changed, and in turn, the repulsive force of the three-dimensional filament bond 3DF during compression can be changed. It is possible to adjust.

The fused bond forming section 120 includes a cooling water tank 123, an underwater take-up machine (a pair of slat conveyors) 124, a plurality of conveying rollers 125a to 125h, and a pair of receiving plates 121 that regulate the thickness of the three-dimensional filament bond. The receiving plate 121 is a metal plate having a bent portion including a flat inclined surface 121a that slopes downward, and a flat vertical surface 121b extending vertically downward from the lower end of the inclined surface 121a.

The receiving plate 121 reduces the longitudinal dimension of the molten filament group MF to the distance between the front and rear vertical planes 121b by guiding the ends of the molten filament group MF in the thickness direction toward the center using the front and rear inclined surfaces 121a. The surface of the molten filament group MF is smoothed while increasing the density of the ends in the thickness direction, thereby forming a high-density smooth surface layer. The density of the high-density smooth surface layer can be adjusted by changing the area (diameter and number of nozzle openings 116a) of the nozzle openings 116a located vertically above the inclined surface 121a of the receiving plate 121.

A cooling water supply device 122 that supplies cooling water to the receiving plate 121 is provided near the upper end of the receiving plate 121. The cooling water tank 123 is a water tank for storing cooling water W. Inside the cooling water tank 123, an underwater hauler 124 and multiple transport rollers 125a to 125h are arranged. The underwater hauler 124 and multiple transport rollers 125a to 125h are driven by a drive motor (not shown), and the repulsive force of the filament 3D combination during compression can be adjusted by changing the speed of the underwater hauler 124.

Examples of thermoplastic resins that can be used as materials for the three-dimensional filament composite include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, polyamide resins such as nylon 66, and polyvinyl chloride resins. , or thermoplastic resins such as polystyrene resins, styrene elastomers, vinyl chloride elastomers, olefin elastomers, urethane elastomers, polyester elastomers, nitrile elastomers, polyamide elastomers, or fluorine elastomers. Can be used.

The thermoplastic resin etc. supplied from the material input section 113 is heated and melted in the cylinder 111a, and is extruded by, for example, a screw 114, and is then transferred as a molten thermoplastic resin etc. from the cylinder outlet 111b to the filament discharging section 112. It is supplied to the flow guide path 112a. Thereafter, a molten filament group MF consisting of a plurality of molten filaments is discharged from each of the plurality of nozzle openings 116a of the nozzle portion 116 so as to translate downward.

The molten filament group MF (a plurality of filaments made of thermoplastic resin) discharged from the nozzle part 116 is adjusted in thickness (front-back dimension) by the receiving plate 121 as described above, and the cooling water W in the cooling water tank 123 is adjusted. Deflected by the buoyant action, each molten filament therein forms a random loop. Random loops are three-dimensionally entangled with adjacent random loops in a molten state, and in the three-dimensionally entangled state, a three-dimensional filament bond 3DF is formed in which the contact points of the filaments are fused and bonded. Ru.

The filament three-dimensional combined body 3DF is transported by the underwater take-up machine 124 and a number of transport rollers 125a-125h while being cooled by the cooling water W in the cooling water tank 123, and is finally discharged outside the cooling water tank 123. The filament three-dimensional combined body 3DF continuously discharged in this manner is cut at appropriate intervals so that the cross section is a plane perpendicular to the transport direction, thereby obtaining an intermediate filament three-dimensional combined body (approximately rectangular filament three-dimensional combined body) that can be used to form each cushion member 11, 12, 13. The filament three-dimensional combined body 3DF used to form the center cushion 11 may be one that is formed to have a smaller repulsive force when compressed than the filament three-dimensional combined body 3DF used to form the left side cushion 12 and the right side cushion 13.

In the above-mentioned intermediate, a high-density smooth surface layer is formed at each portion corresponding to both ends of the molten filament group MF in the thickness direction. One of these high-density smooth surface layers is used as a high-density smooth surface layer on the upper side of each cushion member 11, 12, 13, and the other is used as a high-density smooth surface layer on the lower side of each cushion member 11, 12, 13. can be used. In this case, the distance between the front and rear vertical surfaces 121b of the manufacturing apparatus 100 may be set to match the thickness of each cushion member 11, 12, 13. For example, each intermediate body used for forming each cushion member 11, 12, 13 is cut with a cutter or the like so as to form a left side surface and a right side surface of each cushion member. , 12, 13 can be obtained.

Here, on the cut surface of the filament three-dimensional combination formed by cutting with a cutter etc., the loop shape of the filament forming the filament three-dimensional combination is cut, so that the ends of many filaments are cut off. is protruding outward. When such cut surfaces are brought into surface contact with each other, surface contact in the above-mentioned mating state is realized. Therefore, by forming the left side surface 11c and right side surface 11d of the center cushion 11, the right side surface 12d of the left side cushion 12, and the left side surface 13c of the right side cushion 13 as such cut surfaces, the center cushion 11 and the left side surface 11d are formed as such cut surfaces. Surface contact in a mated state can be easily realized on the contact surface of the side cushion 12 and the contact surface between the center cushion 11 and the right side cushion 13.

However, the method for forming each cushion member 11, 12, 13 is not limited to the above-mentioned method, and each cushion member 11, 12, 13 may be formed using another method. In addition, as a method for forming a high-density smooth surface layer on a three-dimensional filament composite, a cut surface formed by cutting with a cutter or the like is heated and melted while being pressed with a pressing tool or machine. A method of forming a high-density smooth surface layer by pressing may also be adopted.

Further, the interval between the front and rear vertical planes 121b in the manufacturing apparatus 100 is set to match the thickness of the seat cushion 1, and the left-right direction of the nozzle portion 116 is made to correspond to the left-right direction of the seat cushion 1, as illustrated in FIG. 5B. Like the nozzle part 116, the density of the nozzle opening 116a is appropriately set according to the position of each cushion member 11, 12, 13, and the manufacturing apparatus 100 integrally forms each cushion member 11, 12, 13. It may also be molded.

In the nozzle portion 116 illustrated in FIG. 5B, in the region corresponding to the position of the center cushion 11 (region toward the center in the left-right direction), the density of the nozzle opening 116a is set to be relatively small so that the bulk density of the filament three-dimensional bonded body in the center cushion 11 is relatively small. On the other hand, in the region corresponding to the positions of the left and right side cushions 12, 13 (region toward both ends in the left-right direction), the density of the nozzle opening 116a is set to be relatively large so that the bulk density of the filament three-dimensional bonded body in the left and right side cushions 12, 13 is relatively large. According to the manufacturing device 100 provided with such a nozzle portion 116, it is possible to integrally mold each cushion member 11, 12, 13, and it is possible to make the repulsive force of the left and right side cushions 12, 13 at the time of compression larger than the repulsive force of the center cushion 11 at the time of compression.

As explained above, the seat cushion 1 includes a center cushion 11 formed of a three-dimensional combination of filaments, a left side cushion 12 disposed on the left side of the center cushion 11, and a right side cushion disposed on the right side of the center cushion 11. It is configured using each cushion member of the side cushion 13, and is configured to support the user's buttocks on the upper surface. The compression repulsion force of the center cushion 11 is smaller than the compression repulsion force of the left side cushion 12 and the compression repulsion force of the right side cushion 13. The surface layers are adjacent to each other in the left and right direction.

In this way, the seat cushion 1 is constructed using the cushion members 11, 12, and 13 formed of a three-dimensional combination of filaments with very high air permeability. It is less likely to get stuffy than those constructed using . Furthermore, the buttocks can be supported by the high-density smooth surface layer on the upper part of each cushion member 11, 12, 13 adjacent to each other in the left and right direction, so the seat cushion 1 is comfortable to sit on and has excellent durability. In addition, since the high-density smooth surface layers formed on the upper part of each cushion member 11, 12, and 13 are adjacent to each other in the left-right direction, the vertical positional deviation of the high-density smooth surface layer between adjacent cushion members may cause , impairing sitting comfort is avoided as much as possible.

Furthermore, by reducing the repulsive force of the center cushion 11 when compressed and increasing the repulsive force of the left and right side cushions 12 and 13 when compressed, the area where the center cushion 11 sinks deeply (high compression ratio) near the center of the buttocks is It is possible to increase the pressure from the seat cushion 1 in areas where the buttock sinks only shallowly (low compression rate) near both ends of the buttock while preventing the pressure that the buttock receives from the seat cushion 1 from increasing. Therefore, according to the seat cushion 1, a seat cushion that suppresses the trampoline phenomenon and has excellent holdability is realized.

In addition, in the seat cushion 1, the right side surface 12d of the left side cushion 12 slopes downward as it moves to the right and is in surface contact with the left side surface 11c of the center cushion 11, and the left side surface 13c of the right side cushion 13 slopes downward as it moves to the left and is in surface contact with the right side surface 11d of the center cushion 11.

Therefore, the pressure that the buttocks receive from the seat cushion 1 can be gradually increased from the center toward both ends in the left-right direction, thereby widening the permissible range of the buttock width in which good holdability can be maintained. As a result, the seat cushion 1 has excellent holdability for many users with different buttock widths. For example, even if the user has a narrow buttocks, the left and right side cushions 12 and 13 can be used to support the buttocks, and the centrifugal force when the vehicle turns a curve causes the body to sway from side to side. It is possible to prevent as much as possible the situation where the grip becomes easy or the holdability is impaired.

Further, in the seat cushion 1, the right side surface 12d of the left side cushion 12 is in surface contact with the left side surface 11c of the center cushion 11 in a mated state, and the left side surface 13c of the right side cushion 13 is in surface contact with the left side surface 11c of the center cushion 11. It is in surface contact with the surface 11d in a mated state. Therefore, in the seat cushion 1, slipping on the contact surfaces between the cushion members 11, 12, and 13 is suppressed, and it is possible to suppress unintentional sinking of the buttocks.

2. Second embodiment Next, a second embodiment of the present invention will be described. In the following description, the emphasis will be placed on the differences from the first embodiment, and the description of the commonalities between the first embodiment and the second embodiment may be omitted.

FIG. 6 is a sectional view of the seat cushion 2 according to the second embodiment. The seat cushion 2 includes a center cushion 21 disposed at the center in the left-right direction, a left side cushion 22 provided in surface contact with the left side of the center cushion 21, and a right side cushion 22 provided in surface contact with the right side of the center cushion 21. It is constructed using each cushion member of the side cushion 23. The seat cushion 2 has an approximately rectangular parallelepiped shape as a whole, and the upper surface 2a of the seat cushion 2 supports the user's buttocks.

The center cushion 21 is formed of a three-dimensional composite of filaments having a trapezoidal cross section with an upper base shorter than the lower base, and has a high-density smooth surface layer on the upper surface 21a and the lower surface 21b. The left side surface 21c of the center cushion 21 is formed so as to be inclined in a downward direction when proceeding to the left at an angle of about 30 degrees from a vertical imaginary plane. The right side surface 21d of the center cushion 21 is formed to be inclined in a downward direction when going to the right at an angle of about 30 degrees from a vertical imaginary plane.

The left side cushion 22 is formed of a three-dimensional composite of filaments having a trapezoidal cross-sectional shape with an upper base longer than a lower base, and has a high-density smooth surface layer on an upper surface 22a and a lower surface 22b. The left side surface 22c of the left side cushion 22 is formed in a planar shape perpendicular to the left-right direction, and the right side surface 22d of the left side cushion 22 is inclined downward as it moves to the left at an angle of about 30 degrees from a vertical imaginary plane. is formed.

The right side cushion 23 is formed of a three-dimensional filament assembly having a trapezoidal cross-sectional shape with an upper base longer than a lower base, and has a high-density smooth surface layer on an upper surface 23a and a lower surface 23b. The left side surface 23c of the right side cushion 23 is formed so as to be inclined in a downward direction when proceeding to the right at an angle of about 30 degrees from a vertical imaginary plane, and the right side surface 23d of the right side cushion 23 is formed in a planar shape perpendicular to the left-right direction. is formed.

The contact surfaces between the center cushion 21 and the left side cushion 22 and the contact surfaces between the center cushion 21 and the right side cushion 23 are in surface contact in a mating state. The thickness of the seat cushion 2 is preferably 80 mm or more and 200 mm or less. If the thickness of the seat cushion 2 is less than 80 mm, it may be difficult to obtain holdability, and if the thickness exceeds 200 mm, the seat cushion 2 may become bulky.

The inclination angle of the contact surface between the center cushion 21 and the left side cushion 22, and the contact surface between the center cushion 21 and the right side cushion 23 with respect to the vertical imaginary plane is preferably 20 degrees to 50 degrees. If the inclination angle is less than 20 degrees, the holding ability of the seat cushion 2 decreases, while if the inclination angle is more than 50 degrees, the holding ability increases, but the feeling of pressure from the left and right on the buttocks becomes too strong.

In order to obtain good holdability in the seat cushion 2, the compression repulsion force of the center cushion 21 is made smaller than the compression repulsion force of the left side cushion 22 and the compression repulsion force of the right side cushion 23. The specific values of the compression repulsion forces of the center cushion 21, left side cushion 22, and right side cushion 23 may be appropriately determined depending on the weight of the user, the thickness of the seat cushion 2, and the like.

For example, the repulsive force when compressed of the center cushion 21 may be set to be 50 N or more and 80 N or less, and the repulsive force when compressed of the left side cushion 22 and the right side cushion 23 may be set to 100 N or more and 300 N or less. In order to obtain good holdability, the compression repulsion force of the left side cushion 22 and the compression repulsion force of the right side cushion 23 should be at least 1.5 times and 4 times the compression repulsion force of the center cushion 21. It is preferable to set it as below, and it is more preferable to set it as 2 times or more and 3 times or less.

In the seat cushion 2, the density of the high-density smooth surface layer above the center cushion 21 is equal to the density of the high-density smooth surface layer above the left side cushion 22 and the density of the high-density smooth surface layer above the right side cushion 23. It is set to be smaller. The average density of the high-density smooth surface layer on the upper surface 21a of the center cushion 21 is preferably 5 g/cm ³ or more and 20 g/cm ³ or less. If it is less than 5 g/cm ³ , the smoothness and strength tend to decrease, and if it exceeds 20 g/cm ³ , the surface tension increases and the trampoline phenomenon tends to occur.

The average density of the high-density smooth surface layer on the upper surface 22a of the left side cushion 22 and the upper surface 23a of the right side cushion 23 is preferably 20 g/cm ³ or more and 50 g/cm ³ or less. If the average value is less than 20 g/cm ³ , the holdability tends to decrease, while if it exceeds 50 g/cm ³ , body pressure dispersion decreases, resulting in a stiff sitting comfort.

The density of the high-density smooth surface layer on the lower surface 21b of the center cushion 21, the lower surface 22b of the left side cushion 22, and the lower surface 23b of the right side cushion 23 is not particularly limited, but the average value is 25 g/cm ³ or more and 50 g. /cm ³ or less is preferable. If the average value is less than 25 g/cm ³ , it will be difficult to obtain sufficient strength, while if it exceeds 50 g/cm ³ , there is a risk that air permeability will decrease.

In this embodiment, the seat cushion 2 has a rectangular parallelepiped shape, but the seat cushion may be made into an irregular shape by changing the thickness in the front and rear direction or providing unevenness on the surface, as long as the effects of the present invention are not impaired. good

Figure 7 is a cross-sectional view showing the state when the seat cushion 2 is deformed by being pressed by the buttocks B when a user sits on the seat cushion 2. As shown in this figure, the seat cushion 2 supports the buttocks B on the upper surfaces of the cushion members 21, 22, and 23.

As schematically shown by arrows F1 to F3, the pressure that the buttocks B receives from the seat cushion 2 becomes smaller in the vicinity of the central region (more precisely, the ischial region) where the buttocks B sinks the deepest (see arrow F1). , increases toward the user in the vicinity of both left and right ends where the buttocks B sinks in only shallowly (see arrow F3).

As explained above, in the seat cushion 2, the right side surface 22dc of the left side cushion 22 is inclined in a downward direction as it moves to the left, and is in surface contact with the left side surface 21c of the center cushion 21. The left side surface 23c of the side cushion 23 is inclined downward as it moves to the right, and is in surface contact with the right side surface 21d of the center cushion 21.

In addition to the fact that the repulsive force of the center cushion 21 during compression is smaller than that of the left and right side cushions 22 and 23, the contact surfaces between the center cushion 21 and the left and right side cushions 22 and 23 are each inclined downwards as they move outward in the left and right direction, so that when the weight of the user's buttocks is applied to the seat cushion 2, the upper surfaces of the left and right side cushions 22, 23 tend to incline in a direction that pushes them inward toward the user. As a result, the trampoline phenomenon can be suppressed without excessively lowering the density of the high-density smooth surface layer on the upper surface of the center cushion 21, so that holding power, durability, and a smooth seating comfort can all be achieved.

In addition, since each contact surface is inclined as described above, the side cushion has a high repulsion force when compressed on the upper surface of the seat cushion 2 that supports the user's buttocks without reducing the volume of the center cushion 21 excessively. It becomes possible to increase the occupancy rate of 22 and 23. As a result, the vicinity of both the left and right sides of the user's buttocks is supported by the left and right side cushions 22 and 23, which have a high repulsion force when compressed, so even if the user's buttock width is narrow, it is easier to obtain a hold property, which is good. The allowable range of buttock width that provides a comfortable hold is further expanded. For example, even if the user has a narrow buttocks, the left and right side cushions 22 and 23 can be used to support the buttocks, and the body can sway from side to side due to centrifugal force when the vehicle turns a curve. It is possible to prevent as much as possible the situation where the grip becomes easy or the holdability is impaired.

3. Third Embodiment Next, a third embodiment of the present invention will be described. In the following description, emphasis will be placed on the explanation of matters that are different from the first embodiment, and explanations of matters common to the first embodiment may be omitted.

Figure 8 is a cross-sectional view of the seat cushion 3 according to the third embodiment. The seat cushion 3 includes a center cushion 31 disposed in the center in the left-right direction, a left side cushion 32 provided in surface contact with the left side surface of the center cushion 31 in a mating state, a right side cushion 33 provided in surface contact with the right side surface of the center cushion 31 in a mating state, and a base cushion 34. The base cushion 34 is disposed below the seat cushion 3 so as to cover the entire lower sides of the center cushion 31, the left side cushion 32, and the right side cushion 33. The seat cushion 3 has an approximately rectangular parallelepiped shape overall, and the upper surface 3a of the seat cushion 3 supports the buttocks of the user.

The center cushion 31 is formed of a three-dimensional composite of filaments with a trapezoidal cross section, the upper base of which is shorter than the lower base, and has a high-density smooth surface layer on the upper surface 31a and the lower surface 31b. The left side surface 31c of the center cushion 31 is formed at an angle of about 45 degrees from the vertical plane, and is inclined downward when going leftward, and the right side surface 31d of the center cushion 31 is formed at an angle of about 45 degrees from the vertical plane. It is formed so that it slopes downward as you go to the right.

The left side cushion 32 is formed of a three-dimensional composite of filaments with a trapezoidal cross section in which the upper base is longer than the lower base, and has a high-density smooth surface layer on the upper surface 32a and the lower surface 32b. The left side surface 32c of the left side cushion 32 is formed in a planar shape perpendicular to the left-right direction, and the right side surface 32d of the left side cushion 32 is inclined downward as you move leftward at an angle of about 45 degrees from the vertical plane. It is formed.

The right side cushion 33 is formed of a three-dimensional composite of filaments with a trapezoidal cross section in which the upper base is longer than the lower base, and has a high-density smooth surface layer on the upper surface 33a and the lower surface 33b. The left side surface 33c of the right side cushion 33 is formed at an angle of about 45 degrees from the vertical plane so that it slopes downward as you proceed to the right, and the right side surface 33d of the right side cushion 33 is formed in a planar shape perpendicular to the left-right direction. It is formed.

The base cushion 34 is formed of a three-dimensional combination of substantially rectangular parallelepiped filaments, and has a high-density smooth surface layer on an upper surface 34a and a lower surface 34b. The thickness of the seat cushion 3 is preferably 80 mm or more and 200 mm or less. If it is less than 80 mm, it is difficult to obtain good holdability, and if it exceeds 200 mm, the seat cushion tends to be bulky.

In order for the seat cushion 3 to have good holdability, the compression repulsion force of the center cushion 31 needs to be smaller than the compression repulsion force of the left side cushion 32 and the right side cushion 33. The compression repulsion force of the center cushion 31 and the left side cushion 32, and the compression repulsion force of the right side cushion 33 and base cushion 34 are determined based on the weight of the user and the thickness of the seat cushion 3. For example, for the center cushion 31, the compression force should be 50N or more and 80N or less, for the left side cushion 32 and the right side cushion 33, the compression force should be 100N or more and 300N or less, and for the base cushion 34, it should be 100N or more. Also, it is preferable to set it to 200N or less.

In order to obtain good holdability, the compression repulsion force of the left side cushion 32 and the compression repulsion force of the right side cushion 33 should be at least 1.5 times and 4 times the compression repulsion force of the center cushion 31. It is preferable to set it as below, and it is more preferable to set it as 2 times or more and 3 times or less.

In the seat cushion 3, the density of the high-density smooth surface layer above the center cushion 31 is the same as that of the high-density smooth surface layer above the left side cushion 32 and the density of the high-density smooth surface layer above the right side cushion 33. It is set to be smaller. The density of the high-density smooth surface layer of the upper surface 31a of the center cushion 31 is preferably 5 g/cm ³ or more and 20 g/cm ³ or less as an average value. If it is less than 5 g/cm ³ , the smoothness and strength tend to decrease, and if it exceeds 20 g/cm ³ , the surface tension increases and the trampoline phenomenon tends to occur.

The average density of the high-density smooth surface layer on the upper surface 32a of the left side cushion 32 and the upper surface 33a of the right side cushion 33 is preferably 20 g/cm ³ or more and 50 g/cm ³ or less. If it is less than 20 g/cm ³ , the holdability tends to deteriorate, and if it exceeds 50 g/cm ³ , the body pressure dispersion property decreases, resulting in a stiff sitting comfort.

There is no particular restriction on the density of the high-density smooth surface layer on the lower surface 31b of the center cushion 31, the lower surface 32b of the left side cushion 32, and the lower surface 33b of the right side cushion 33, but the average value is 25 g/cm ³ or more and 50 g/cm 3 or more. It is preferably less than ^cm3 . When it is less than 25 g/cm ³ , it becomes difficult to obtain sufficient strength, and when it exceeds 50 g/cm ³ , air permeability decreases.

The average density of the high-density smooth surface layer on the upper surface 34a of the base cushion 34 is preferably 10 g/cm ³ or more and 30 g/cm ³ or less. By setting the weight to 10 g/cm ³ or more, a high-density smooth surface layer with high tension is formed in the middle layer of the seat cushion 3, so that when a local load is applied to the central part of the center cushion 31, such as from a knee, The trampoline effect also reduces the feeling of hitting the bottom. If it exceeds 30 g/cm ³ , the surface tension becomes too large and tends to make sitting uncomfortable.

The thickness of the base cushion 34 is preferably 40 mm or more and 80 mm or less. If it is less than 40 mm, it will be difficult to suppress the feeling of bottoming out against local loads, and if it exceeds 80 mm, the sitting comfort will tend to feel stiff.

In this embodiment, the seat cushion 3 has a rectangular parallelepiped shape, but the seat cushion 3 may have an irregular shape, such as by changing the thickness in the front-rear direction or providing unevenness on the surface, as long as the effects of the present invention are not impaired.

4. Fourth Embodiment Next, a fourth embodiment of the present invention will be described. In the following description, emphasis will be placed on the explanation of matters that are different from the first embodiment, and explanations of matters common to the first embodiment may be omitted. The seat cushion of the fourth embodiment has basically the same configuration as the seat cushion of the first embodiment, except that the shapes of the contact surfaces between the cushion members are different.

Figure 9 is a cross-sectional view of the seat cushion 4 according to the fourth embodiment. The seat cushion 4 includes a center cushion 41 disposed in the center in the left-right direction, a left side cushion 42 provided in surface contact with the left side surface of the center cushion 41 in a mating state, and a right side cushion 43 provided in surface contact with the right side surface of the center cushion 41 in a mating state.

The center cushion 41 is formed of a three-dimensional combination of filaments with a hexagonal cross-section, and has a high-density smooth surface layer on an upper surface 41a and a lower surface 41b. As shown in FIG. 9, each of the left side surface 41c and the right side surface 41d of the center cushion 41 has two inclined surfaces that are inclined outward in the left-right direction when proceeding from the vertical end toward the center.

The left side cushion 42 is formed of a three-dimensional combination of filaments with a pentagonal cross-section, and has a high-density smooth surface layer on an upper surface 42a and a lower surface 42b. The left side surface 42c of the left side cushion 42 is formed in a planar shape perpendicular to the left-right direction, and the right side surface 42d of the left side cushion 42 is formed in a shape that allows surface contact with the left side surface 41c of the center cushion 41 as a whole. ing.

The right side cushion 43 is formed of a three-dimensional combination of filaments with a pentagonal cross-section, and has a high-density smooth surface layer on an upper surface 43a and a lower surface 43b. The left side surface 43c of the right side cushion 43 is formed in a shape that allows surface contact with the right side surface 41d of the center cushion 41 as a whole, and the right side surface 43d of the right side cushion 43 is formed in a planar shape perpendicular to the left-right direction. ing.

5. Fifth Embodiment Next, a fifth embodiment of the present invention will be described. In the following description, emphasis will be placed on the explanation of matters that are different from the first embodiment, and explanations of matters common to the first embodiment may be omitted. The seat cushion of the fifth embodiment has basically the same configuration as the seat cushion of the first embodiment, except that the shapes of the contact surfaces between the cushion members are different.

FIG. 10 is a sectional view of the seat cushion 5 according to the fifth embodiment. The seat cushion 5 includes a center cushion 51 disposed at the center in the left-right direction, a left side cushion 52 disposed in mating surface contact with the left side surface of the center cushion 51, and a left side cushion 52 provided on the right side surface of the center cushion 51. and a right side cushion 53 that is provided in surface contact in a mating state.

The center cushion 51 is formed of a three-dimensional composite of filaments having a substantially rectangular cross-sectional shape (the left and right sides are arcuate), and has a high-density smooth surface layer on an upper surface 51a and a lower surface 51b. The cross-sectional shape of the left side surface 51c and right side surface 51d of the center cushion 51 is formed into an arc shape that bulges outward in the left-right direction.

The left side cushion 52 is formed of a three-dimensional composite of filaments having a substantially rectangular cross-sectional shape (the right side is arcuate), and has a high-density smooth surface layer on an upper surface 52a and a lower surface 52b. The left side surface 52c of the left side cushion 52 is formed into a planar shape perpendicular to the left-right direction, and the cross-sectional shape of the right side surface 52d of the left side cushion 52 is such that it can make surface contact with the left side surface 51c of the center cushion 51 as a whole. It is formed in an arc shape that bulges to the left.

The right side cushion 53 is formed of a three-dimensional composite of filaments having a substantially rectangular cross-sectional shape (the left side is arcuate), and has a high-density smooth surface layer on an upper surface 53a and a lower surface 53b. The cross-sectional shape of the left side surface 53c of the right side cushion 53 is formed into an arc shape that swells toward the right so that it can come into surface contact with the right side surface 51d of the center cushion 51 as a whole, and the right side surface 53d of the right side cushion 53 is shaped like an arc. It is formed in a planar shape perpendicular to the left-right direction.

6. Sixth Embodiment Next, a sixth embodiment of the present invention will be described. In the following description, emphasis will be placed on the explanation of matters that are different from the first embodiment, and explanations of matters common to the first embodiment may be omitted.
The seat cushion of the sixth embodiment has basically the same configuration as the seat cushion of the second embodiment, except that a plurality of cylindrical cavities h are provided.

FIG. 11 is a sectional view of the seat cushion 6 according to the sixth embodiment. The seat cushion 6 includes a center cushion 61 disposed at the center in the left-right direction, a left side cushion 62 disposed in mating surface contact with the left side surface of the center cushion 61, and a left side cushion 62 provided on the right side surface of the center cushion 61. and a right side cushion 63 that is provided in surface contact in a mating state.

The center cushion 61 is formed of a three-dimensional composite of filaments having a trapezoidal cross-sectional shape where the upper base is shorter than the lower base, and has a high-density smooth surface layer on the upper surface 61a and the lower surface 61b. A plurality of cylindrical cavities h are formed inside the center cushion 61, each extending from the front side (knee side) to the rear side (waist side).

The left side cushion 62 is formed of a three-dimensional filament assembly having a trapezoidal cross-sectional shape with an upper base longer than a lower base, and has a high-density smooth surface layer on an upper surface 62a and a lower surface 62b. A plurality of cylindrical cavities h are formed inside the left side cushion 62, each extending from the front side (knee side) to the rear side (waist side).

The right side cushion 63 is formed of a three-dimensional filament assembly with a trapezoidal cross-sectional shape with the upper base longer than the lower base, and has high-density smooth surface layers on the upper surface 63a and lower surface 63b. Inside the right side cushion 63, multiple cylindrical cavities h are formed, each extending from the front side (knee side) to the back side (waist side).

7. Seventh embodiment Next, a seventh embodiment of the present invention will be described. In the following description, the emphasis will be placed on the differences from the first embodiment, and the description of the commonalities between the first embodiment and the seventh embodiment may be omitted.
The seat cushion of the seventh embodiment has a structure basically similar to that of the seat cushion of the fourth embodiment, except that a part of the center cushion near both the left and right sides is formed as a cavity h.

FIG. 12 is a sectional view of the seat cushion 7 according to the seventh embodiment. The seat cushion 7 includes a center cushion 71 disposed at the center in the left-right direction, a left side cushion 72 disposed on the left side of the center cushion 71, and a right side cushion 73 disposed on the right side of the center cushion 71. Be prepared.

The center cushion 71 is formed of a three-dimensional composite of filaments with a rectangular cross-section, and has a high-density smooth surface layer on an upper surface 71a and a lower surface 71b. A right side surface 71c and a left side surface 71d of the center cushion 71 are formed in a planar shape orthogonal to the left-right direction.

The left side cushion 72 is formed of a three-dimensional combination of filaments with a pentagonal cross section, and has a high-density smooth surface layer on an upper surface 72a and a lower surface 72b. The left side cushion 72 is formed in the same shape as the left side cushion 42 of the fourth embodiment.

The right side cushion 73 is formed of a three-dimensional combination of filaments with a pentagonal cross section, and has a high-density smooth surface layer on an upper surface 73a and a lower surface 73b. The right side cushion 73 is formed in the same shape as the right side cushion 43 of the fourth embodiment.

The upper high-density smooth surface layers of the left side cushion 72 and the right side cushion 73 are adjacent to the upper high-density smooth surface layer of the center cushion 71 in the left-right direction, and the lower high-density smooth surface layers of the left side cushion 72 and the right side cushion 73 are adjacent to the lower high-density smooth surface layer of the center cushion 71 in the left-right direction. With this configuration, the seat cushion 7 has triangular prism-shaped cavities h on the left and right sides of the center cushion 71.

8. Eighth embodiment Next, an eighth embodiment of the present invention will be described. In the following description, the emphasis will be placed on the differences from the first embodiment, and the description of the commonalities between the first embodiment and the eighth embodiment may be omitted.

FIG. 13 shows a cross-sectional view of the seat cushion 8 according to the eighth embodiment and its various modifications. Note that each cushion layer of each seat cushion shown in FIG. 13 is provided with a high-density smooth surface layer on the upper and lower portions, similar to the seat cushion 2 of the second embodiment, but in FIG. The display is omitted. In addition, in FIG. 13, "H" indicates a high repulsion cushion made of a three-dimensional combination of filaments with a relatively large repulsion force when compressed, and "S" indicates a high repulsion cushion made of a three-dimensional combination of filaments with a relatively small repulsion force when compressed. This is a low-resilience cushion.

FIG. 13(a) is a cross-sectional view of the seat cushion 8. FIG. The seat cushion 8 has a two-layer structure consisting of an upper cushion layer and a lower cushion layer, and the basic configuration of each cushion layer is the same as the seat cushion 2 of the second embodiment.

FIG. 13(b) is a cross-sectional view of a seat cushion 81 that is a modified example of the seat cushion 8. As shown in FIG. The seat cushion 81 has the same configuration as the seat cushion 8 except that the shapes of the high resilience cushion and the low resilience cushion in the lower cushion layer are different.

FIG. 13(c) is a cross-sectional view of a seat cushion 82 that is another modified example of the seat cushion 8. As shown in FIG. The seat cushion 82 has the same configuration as the seat cushion 8 except that the lower cushion layer of the seat cushion 8 is upside down.

FIG. 13(d) is a cross-sectional view of a seat cushion 83 that is still another modified example of the seat cushion 8. As shown in FIG. The seat cushion 83 has the same configuration as the seat cushion 82 except that the shapes of the high resilience cushion and the low resilience cushion in the upper cushion layer are different.

9. Ninth Embodiment Next, a ninth embodiment of the present invention will be described. In the following description, emphasis will be placed on the explanation of matters that are different from the first embodiment, and explanations of matters common to the first embodiment may be omitted.

FIG. 14 is a sectional view of the seat cushion 9 and its modifications according to the ninth embodiment. Note that each cushion layer of each seat cushion shown in FIG. 14 is provided with a high-density smooth surface layer at the upper and lower portions, similar to the seat cushion 2 of the second embodiment, but in FIG. 14, the high-density smooth surface layer is The display is omitted. In addition, in FIG. 14, "H" indicates a high repulsion cushion made of a three-dimensional combination of filaments with a relatively large repulsion force when compressed, and "S" indicates a high repulsion cushion made of a three-dimensional combination of filaments with a relatively small repulsion force when compressed. This is a low-resilience cushion.

FIG. 14(a) is a sectional view of the seat cushion 9. The seat cushion 9 has a three-layer structure consisting of an upper cushion layer, a middle cushion layer, and a lower cushion layer, and the basic configuration of each cushion layer is the same as the seat cushion 2 of the second embodiment.

FIG. 14(b) is a cross-sectional view of a seat cushion 91 that is a modified example of the seat cushion 9. FIG. The seat cushion 91 has the same configuration as the seat cushion 9 except that the shapes of the high resilience cushion and the low resilience cushion in the middle cushion layer and the lower cushion layer are different.

FIG. 14(c) is a cross-sectional view of a seat cushion 92 that is another modified example of the seat cushion 9. As shown in FIG. The seat cushion 92 has the same structure as the seat cushion 9 except that the upper cushion layer is upside down.

FIG. 14(d) is a sectional view of a seat cushion 93 that is still another modification of the seat cushion 9. As shown in FIG. The seat cushion 93 has the same structure as the seat cushion 9 except that the upper cushion layer is made of only a low-resilience cushion.

FIG. 14(e) is a cross-sectional view of a seat cushion 94 that is still another modified example of the seat cushion 9. As shown in FIG. The seat cushion 93 has the same structure as the seat cushion 9 except that the lower cushion layer is made of only a high resilience cushion.

FIG. 14(f) is a cross-sectional view of a seat cushion 95 that is still another modified example of the seat cushion 9. As shown in FIG. The seat cushion 93 has the same structure as the seat cushion 9 except that the lower cushion layer is upside down.

10. Others The seat cushions according to the embodiments of the present invention described above each include a center cushion formed of a three-dimensional composite of filaments, a left side cushion arranged on the left side of the center cushion, and a left side cushion arranged on the right side of the center cushion. The right side cushion supports the user's buttocks on the upper surface. Furthermore, in the seat cushion, the compression repulsion force of the center cushion is smaller than the compression repulsion force of the left side cushion and the compression repulsion force of the right side cushion, and the high-density smooth surface layer formed on the upper part of each cushion member are adjacent in the left and right direction. Therefore, the seat cushion is not stuffy, is comfortable to sit on, has excellent durability, and also suppresses the trampoline phenomenon and has excellent holdability.

Although the embodiment of the present invention has been described above, the configuration of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention. In other words, the above embodiment should be considered to be illustrative in all respects and not restrictive. The technical scope of the present invention is indicated by the claims, not the description of the above embodiment, and should be understood to include all modifications that are equivalent in meaning and scope to the claims.

INDUSTRIAL APPLICATION This invention can be utilized for the seat cushion for various vehicles.

1, 2, 3, 4, 5, 6, 7, 8, 9 Seat cushion 11, 21, 31, 41, 51, 61, 71 Center cushion 12, 22, 32, 42, 52, 62, 72 Left side cushion 13, 23, 33, 43, 53, 63, 73 Right side cushion 100 Manufacturing equipment 110 Molten filament supply section 111 Pressure melting section 111a Cylinder 111b Cylinder discharge port 112 Filament discharge section 112a Channel 113 Material input section 114 Screw 115 Screw motor 116 Nozzle part 116a Nozzle opening 118 Die heater 120 Fusion joint forming part 121 Reception plate 121a Inclined surface 121b Vertical surface 122 Cooling water supply device 123 Cooling water tank 124 Underwater take-up machine 125a to 125h Conveyance roller

Claims (6)

It is configured using cushion members of a center cushion each formed of a three-dimensional filament combination, a left side cushion arranged on the left side of the center cushion, and a right side cushion arranged on the right side of the center cushion, A seat cushion that supports a user's buttocks on its upper surface,
The compression repulsion force of the center cushion is smaller than the compression repulsion force of the left side cushion and the compression repulsion force of the right side cushion,
A seat cushion characterized in that the high-density smooth surface layers formed on the upper part of each of the cushion members are adjacent to each other in the left-right direction. The right side of the left side cushion is
As it moves to the right, it slopes downward and is in surface contact with the left side surface of the center cushion.
The left side of the right side cushion is
2. The seat cushion according to claim 1, wherein the seat cushion is inclined in a downward direction when moving to the left, and is in surface contact with the right side surface of the center cushion. The right side of the left side cushion is
As it moves to the left, it slopes downward and is in surface contact with the left side surface of the center cushion.
The left side of the right side cushion is
The seat cushion according to claim 1, wherein the seat cushion is inclined in a downward direction when going to the right, and is in surface contact with the right side surface of the center cushion. 4. The density of the high-density smooth surface layer of the center cushion is lower than the density of the high-density smooth surface layer of the left side cushion and the density of the high-density smooth surface layer of the right side cushion. seat cushion. The left side surface of the high-density smooth surface layer of the center cushion and the right side surface of the high-density smooth surface layer of the left side cushion are fixed by being fused,
Claims 1 to 4, wherein the right side surface of the high-density smooth surface layer of the center cushion and the left side surface of the high-density smooth surface layer of the right side cushion are fixed by being fused. The seat cushion described in any of the above. It has a cushion cover with an anti-expansion member added,
The respective cushion members are maintained in close contact with each other by being accommodated in the cushion cover,
The elongation prevention member is
The seat cushion according to any one of claims 1 to 4, wherein the seat cushion is made of a material that is less stretchable than the material of the cushion cover, and is arranged so as to surround each of the cushion members.