JP7184553B2 - SEAT PAD AND SEAT PAD MANUFACTURING METHOD - Google Patents

Description

The present invention relates to a seat pad and a method for manufacturing a seat pad.

Among conventional seat pads, there is a cushion pad in which an elastic tube into which a fluid is injected to maintain internal pressure is integrally molded with foamed resin (see, for example, Patent Document 1).

JP-A-2005-80938

However, in the above-described conventional seat pad, the elastic tube is integrally formed of foamed resin, but when the end of the elastic tube is pulled, the elastic tube may be easily pulled out from the cushion pad.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seat pad to which a tube is firmly fixed, and a method for manufacturing the seat pad that can easily obtain the seat pad.

A seat pad according to the present invention includes a seat pad body made of foamed polyurethane resin and a tube embedded in the seat pad body, the tube being made of polyurethane resin, and the seat pad body being the tube. At least one end surface of the tube is exposed from the surface of the seat pad main body. The seat pad according to the present invention is a seat pad in which the tube is firmly fixed.

The seat pad which concerns on this invention WHEREIN: The said tube shall be arrange|positioned along the supporting surface of the said seat pad main body. Here, the "supporting surface" refers to the surface of the seat pad main body that is in contact with the user when the user uses it (sitting). In this case, the movement of the tube can easily follow the movement of the pad body, so that the durability of the tube can be improved.

In the seat pad according to the present invention, it is preferable that the tube is a conduit into which cables can be inserted. Said conduit is capable of inserting at least one cable. Examples of the cables include not only conductors such as cables and cords, but also supply pipes and discharge pipes for circulating gas and liquid. In this case, cables and the like can be easily inserted into the interior of the seat pad body.

In the seat pad according to the present invention, the conduit may be filled with a lubricating material. In this case, cables and the like can be more easily inserted into the interior of the seat pad body.

In the seat pad according to the present invention, it is preferable that the tube is arranged in the seat portion. In this case, since the tube is embedded in the seat cushion portion in which various cables and the like can be arranged, it is convenient for inserting the cables and the like.

A method for manufacturing a seat pad according to the present invention is a method for manufacturing a seat pad in which a tube is embedded in a seat pad body made of foamed polyurethane resin, wherein a tube made of polyurethane resin is used as the tube, and the tube is foaming a polyurethane resin in a mold in which is placed. In this case, it is possible to easily obtain a seat pad in which the tube is firmly fixed.

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the seat pad which can obtain the seat pad with which the tube was fixed firmly, and the said seat pad easily can be provided.

It is a perspective view showing roughly a seat pad concerning one embodiment of the present invention. FIG. 2 is a schematic perspective view for explaining a method of inserting cables into the seat pad of FIG. 1; It is a schematic sectional drawing for demonstrating the manufacturing method of the seat pad which concerns on one Embodiment of this invention. FIG. 4B is another schematic cross-sectional view for explaining the method of manufacturing the seat pad according to the embodiment of the present invention. FIG. 3B is a schematic cross-sectional view of the seat cushion pad obtained from FIGS. 3A and 3B; FIG. 5 is a perspective view schematically showing a seat pad according to another embodiment of the invention;

A seat pad and a method for manufacturing the seat pad according to an embodiment of the present invention will be described below with reference to the drawings.

[Seat pad]
In FIG. 1, reference numeral 1 denotes a seat pad according to one embodiment of the present invention. The seat pad 1 can be used, for example, in vehicle seats such as automobile seats, wheelchair seats, and other seats. In this embodiment, the seat pad 1 is for vehicles, more specifically, for automobiles.

The seat pad 1 has a seat pad body 2 made of foamed polyurethane resin. In this embodiment, the seat pad main body 2 has a cushion pad portion 2A, a back pad portion 2B, and a headrest portion 2C.

In addition, the seat pad 1 has a tube 3 embedded in the seat pad body 2 . According to the present invention, the tube 3 can be arranged in at least one of the cushion pad portion 2A, the back pad portion 2B and the headrest portion 2C. In this embodiment, the tube 3 is arranged only in the cushion pad portion 2A for the sake of simplification of explanation.

The tube 3 is made of polyurethane resin. Examples of the polyurethane resin include thermoplastic polyurethane resins. Furthermore, as the thermoplastic polyurethane resin, trade name "Milactran (registered trademark) E660" (manufactured by Nihon Miractran Co., Ltd.) can be mentioned. Moreover, it is preferable that the hardness of the tube 3 is the same as that of the seat pad main body 2 . Here, the hardness of the tube 3 and the seat pad main body 2 can be measured by, for example, a Vickers hardness test. In this case, the seat pad main body 2 and the tube 3 are easy to fit together, and it is possible to prevent discomfort when sitting due to the difference in rigidity between the seat pad main body 2 and the tube 3 . Moreover, the shear stress generated in the joint surface between the seat pad main body 2 and the tube 3 can be suppressed, and the durability can be improved.

Also, the seat pad main body 2 is formed integrally with the tube 3 . In this embodiment, the cushion pad portion 2A is molded using the tube 3 as an insert. Further, in this embodiment, the seat pad main body 2 has a recess 2n. According to the present invention, the recess 2n can be arranged in at least one of the cushion pad portion 2A, the back pad portion 2B and the headrest portion 2C. In this embodiment, as an example, the cushion pad portion 2A has a recess 2n. It can also be at least one of the tubes 3 according to the invention. In this embodiment, a plurality of tubes 3 are arranged.

Furthermore, at least one end 3 e of the tube 3 is exposed from the surface of the seat pad main body 2 . The end 3e of the tube 3 can be exposed so as to form a flush surface with the seat pad body 2 surface. Alternatively, the end 3 e of the tube 3 can protrude from the surface of the seat pad body 2 .

One end 3 e 1 of the tube 3 is exposed from the surface f of the seat pad main body 2 . In this embodiment, the surface f of the seat pad body 2 includes a front surface f1, a side surface f2, a back surface f3 and a bottom surface f4. According to the present invention, one end 3e1 of the tube 3 can be exposed from at least one of the front surface f1, the two side surfaces f2, the rear surface f3 and the bottom surface f4 of the seat pad body 2. In this embodiment, one end 3e1 of the tube 3 is at least one of the front end surface f1a1, the seat surface (supporting surface) f1a2, the two side surfaces f2a, the back surface f3a and the bottom surface f4a (f4) of the cushion pad portion 2A. It can be exposed from one side. In this embodiment, one end 3e1 of the tube 3 is exposed from each of the front end face f1a1, the two side faces f2a and the back face f3a of the cushion pad portion 2A, for example. Further, as an example, on the front end face f1a1 of the cushion pad portion 2A, one end 3e1 of the tube 3 is exposed so as to form the same plane as the front end face f1a1. Further, as an example, one end 3e1 of the tube 3 protrudes from the side surface f2a and the back surface f3a of the cushion pad portion 2A.

On the other hand, the other end 3 e 2 of the tube 3 is exposed from the inner surface f 5 of the recess 2 n formed in the seat pad body 2 . According to the present invention, the other end 3e2 of the tube 3 can be exposed from at least one of the four side surfaces f5a and bottom surface f5b forming the recess 2n formed in the seat pad body 2. In this embodiment, the other end 3e2 of the tube 3 is exemplarily exposed from each of the four side surfaces f5a.

In the seat pad 1 according to this embodiment, the tube 3 is a conduit into which the cables 4 are inserted. Said conduit allows at least one cable 4 to be inserted. Examples of the cables 4 include not only conductors such as cables, cords, and lead wires, but also supply pipes and discharge pipes for circulating gas and liquid. Further, examples of the cable include a power cable and a communication cable. In this embodiment, the cables 4 are explained as a power cable and a communication cable. Moreover, when the cables 4 are cables, it is also possible to attach a sensor to the tip of the cables 4 .

When the tube 3 is a conduit, the inner diameter of the tube 3 is preferably 110% to 200% of the outer diameter of the cables 4 . When the inner diameter of the tube 3 is 110% or more of the outer diameter of the cables 4 , the cables 4 can be reliably inserted into the tube 3 . Moreover, when the inner diameter of the tube 3 is 200% or more of the outer diameter of the cables 4, at least two cables 4 can be inserted.

Here, a method for inserting the cables 4 inside the seat pad 1 will be described with reference to FIG. In FIG. 2, reference numeral 5 denotes a storage element that is stored inside the seat pad 1. As shown in FIG. The storage elements 5 include electrical components such as sensors, heaters and coolers, and heat exchange pipes. Cables 4 can be connected to the storage element 5 . After storing the storage element 5 in the recess 2n of the seat pad 1, it can be closed by covering with a similar foamed polyurethane resin.

As shown in FIG. 2, in this embodiment, the operator inserts the cables 4 from one end 3e1 of the tube 3 exposed from the seat pad main body 2 (here, the cushion pad portion 2A). As a result, the cables 4 are sent to the recess 2n formed in the seat pad main body 2. As shown in FIG. Cables 4 projecting from the other end 3 e 2 of tube 3 can be connected to storage element 5 .

According to the seat pad 1 according to this embodiment, the seat pad main body 2 and the tube 3 are made of the same polyurethane resin material, and the seat pad main body 2 is molded integrally with the tube 3 . The tube 3 made of polyurethane resin is integrated with the seat pad main body 2 by being compatible with the foamed polyurethane resin. Therefore, the outer peripheral surface 3f of the tube 3 does not slide with respect to the seat pad main body 2. As shown in FIG. On the other hand, since the inner peripheral surface of the tube 3 is smooth, the inserted cables 4 move smoothly inside the tube 3 . Therefore, the cables 4 can be easily inserted into the tube 3 . Moreover, the cables 4 can be easily pulled out from the tube 3, and the cables 4 can be easily replaced.

Furthermore, according to the seat pad 1 according to the present embodiment, the tube 3 is made of polyurethane resin, so that it has flexibility (elasticity) and can be deformed and restored. Therefore, even if the entire seat pad 1 bends when the user sits on the seat (loaded with a heavy object), the cables 4 arranged inside the tube 3 can be bent to the extent that the tube 3 bends. It is possible to slide and move together. Therefore, even when the seat pad 1 as a whole bends, disconnection of the cables 4 can be prevented.

As described above, the seat pad 1 according to this embodiment includes a seat pad body 2 made of foamed polyurethane resin and a tube 3 embedded in the seat pad body 2. The tube 3 is made of polyurethane resin, The seat pad main body 2 is formed integrally with the tube 3 , and at least one end 3 e of the tube 3 is exposed from the surface 2 f of the seat pad main body 2 . Therefore, according to this embodiment, a seat pad in which the tube 3 is firmly fixed is obtained. In addition, according to this embodiment, it is preferable to arrange an elastic material at the end of the cables 4 . In this case, the elastic material expands and contracts when the cables 4 slide in the tube 3, so that good movement of the cables 4 can be realized.

In this embodiment, the tube 3 can be arranged along the supporting surface of the seat pad main body 2 . Here, the support surface of the seat pad main body 2 refers to the surface on the side that the user comes into contact with when the user uses it (sitting). In this case, the movement of the tube 3 can easily follow the movement of the seat pad body 2, so that the durability of the tube 3 can be improved. In this embodiment, the tube 3 is arranged along the seat surface f1a2 of the cushion pad portion 2A. When the tube 3 is arranged on the back pad portion 2B, it is preferable that the tube 3 is arranged along the supporting surface f1b of the back pad portion 2B. Furthermore, when the tube 3 is arranged on the headrest portion 2C, the tube 3 is preferably arranged along the support surface f1c of the headrest portion 2C.

Moreover, in this embodiment, the tube 3 is preferably a conduit into which the cables 4 can be inserted. In this case, the cables 4 can be easily inserted into the interior of the seat pad body 2 . In this embodiment, the tube 3 is a conduit into which cables 4 can be inserted. Therefore, according to this embodiment, the cables 4 can be easily inserted into the cushion pad portion 2A.

Further, in the seat pad 1 according to this embodiment, the conduit may be filled with a lubricating material. In this case, the cables 4 can be inserted into the seat pad main body 2 more easily. In this embodiment, the inside of the tube 3 is filled with a lubricating material. Examples of the lubricating material include a highly viscous lubricating material such as grease.

Furthermore, in this embodiment, the tube 3 is preferably arranged in the cushion pad portion (seat portion) 2A. The tube 3 can be arranged in at least one of the cushion pad portion 2A, the back pad portion 2B, and the headrest portion 2C. In this embodiment, the tube 3 is arranged in the cushion pad portion 2A. In this case, since the tube 3 is embedded in the cushion pad portion 2A in which various cables 4 can be arranged, it is convenient to insert the cables. Further, in this case, the placement of the tube 3 in the cushion pad portion (seat portion) 2A, which frequently moves, is effective in preventing the tube 3 from being pulled out.

FIG. 4 schematically shows a seat pad 1' according to another embodiment of the invention. The tube 3 according to this embodiment has side pad portions 2D on both sides of the cushion pad portion 2A. In this embodiment, the tube 3 has an accommodating portion 3b at the other end 3e2. A storage element 5 can be incorporated in the storage portion 3b. Such a tube 3 can be formed, for example, by blow molding using a mold. In this case, it is not necessary to form the recess 2n in the seat pad 1'. That is, the seat pad 1' can be manufactured only by molding by using the tube 3 as an insert. Moreover, in this embodiment, the tube 3 can also be arranged in the side pad portion 2D.

[Manufacturing method of seat pad]
Next, a method for manufacturing a seat pad according to this embodiment will be described with reference to FIGS. 3A to 3C. The seat pad manufacturing method according to the present embodiment is a method of manufacturing a seat pad in which a tube 3 is embedded in a seat pad body 2 made of foamed polyurethane resin. The seat pad manufacturing method according to this embodiment includes a step of using a polyurethane resin tube as the tube 3 and foaming the polyurethane resin in a mold in which the tube 3 is arranged.

As shown in FIG. 3A, in this embodiment, first, the tube 3 made of polyurethane resin is arranged in the mold 10 . In this embodiment, the mold 10 is a split mold made up of a plurality of mold pieces 10A. Next, as shown in FIG. 3B, a plurality of mold pieces 10A are clamped to form a mold 10, and a cavity C forming a seat pad is formed inside the mold 10. As shown in FIG. In this embodiment, the cavity C forms the cushion pad portion 2A. At this time, the tube 3 is arranged at a predetermined three-dimensional coordinate position within the cavity C. As shown in FIG. A predetermined raw material is injected into the cavity C where the mold is clamped, and is foamed in the cavity C. After that, as shown in FIG. 3C, the molded product taken out from the mold 10 is formed with recesses 2n. The recessed portion 2n can be formed, for example, by cutting the area A demarcated by the dashed line in FIG. 3C. Alternatively, by inserting a core into the cavity C of the mold 10, molding can be performed simultaneously with foaming.

The tube 3 made of thermoplastic polyurethane resin is manufactured by adjusting the modulus hardness and the like in order to maintain the flexibility, compressive strain, and hardness required for the polyurethane sponge sheet material. In this case, unlike the case where a hole for burying the tube 3 is processed by drill cutting or the like, the tube 3 having a different diameter, the dam-shaped tube 3 (a shape in which the diameter of the tube 3 changes in multiple steps), the tube It is also possible to correspond to the case of forming a network shape, such as branching 3 into a plurality of branches such as bifurcation and trifurcation.

The method for manufacturing a seat pad according to the present embodiment is a method for manufacturing a seat pad in which a tube is embedded in a seat pad body made of foamed polyurethane resin. As shown in 3B, it includes a step of foaming polyurethane resin in the mold 10 in which the tube 3 is arranged. In this case, a seat pad to which the tube 3 is firmly fixed can be easily obtained. In this embodiment, the cushion pad portion 2A to which the tube 3 is firmly fixed can be easily obtained. Furthermore, the polyurethane tube can be made by branching a single tube into multiple tubes, as described above. In this case, by using a tube having complicated branches in advance as the tube 3 , it is possible to easily form a complicated conduit inside the seat pad body 2 . As described above, when using a tube obtained by branching one tube into a plurality of tubes as the tube 3, as a method of inserting the cables 4 into a desired tube among the tubes 3, for example, a cable There is a guide wire manipulation technique in which a wire passed through the cable 4 is used as a guide member and the cable 4 is guided to a target tube. Further, in the present embodiment, the recess 2n is opened on the support surface f1a2 of the cushion pad portion 2A, but it can be opened on a surface other than the support surface f1a2 (for example, the bottom surface f4).

The foregoing merely discloses some embodiments of the present invention, and various modifications are possible within the scope of the claims. For example, the tube 3 can be placed on the back pad portion 2B. In this case, one end 3e1 of the tube 3 can be exposed from at least one of the front surface (supporting surface) f1b, the two side surfaces f2b, the rear surface f3b and the bottom surface f4b of the back pad portion 2B. Further, the tube 3 can be arranged in the headrest portion 2C. In this case, one end 3e1 of the tube 3 can be exposed from at least one of the front surface (supporting surface) f1c, the two side surfaces f2c, the rear surface f3c, and the bottom surface f4c of the headrest portion 2C. In this case, the tube 3 can be arranged on the armrest portion and the footrest portion. Moreover, the seat pad according to the present invention is not limited to one that integrally includes the cushion pad portion 2A, the back pad portion 2B, and the headrest portion 2C. The seat pad according to the present invention also includes a seat pad in which at least one of the cushion pad portion 2A, the back pad portion 2B, and the headrest portion 2C independently configures the seat pad. Furthermore, the seat pad according to the present invention may have an armrest portion and a footrest portion. These also include those configured integrally or independently as the seat pad according to the present invention. Further, when the storage element 5 is a thin film sensor or the like, it is not necessary to provide the seat pad 1 with the recess 2n or to provide the tube 3 with the storage portion 3b. That is, it is also possible to use a normal tube 3 as shown in FIG.

<Example 1>
Three tubes (outer diameter: 2.0 mm, inner diameter: 1.4 mm) made of foamed polyurethane resin were arranged in a cylindrical mold with a diameter of 100 mm and a height of 50 mm. The three tubes were arranged radially from the center of the bottom surface of the cylindrical mold so as to be substantially symmetrical. Polyol (Sunnix (registered trademark) GP3000U, Sanyo Chemical Industries, Ltd.) 100 parts by weight, isocyanate (Cosmonade T80, Mitsui Chemicals, Inc.) 60 parts by weight, water 5 parts by weight, additive tin catalyst (WG31-NK, Japan) Kagaku Sangyo Co., Ltd.) 0.2 parts by weight, polyol as a solvent for the catalyst (Sunnix (registered trademark) GS3000, Sanyo Chemical Industries Co., Ltd.) 0.8 parts by weight, foam stabilizer (L580/STL, Momentive Performance Materials) 1 part by weight, 3 parts by weight of a foaming agent (dichloromethane, Tokuyama Corporation), and 0.3 parts by weight of an amine catalyst (33LV, Tosoh Corporation) are stirred with a dissolver stirrer for 10 seconds, and quickly formed into the cylindrical mold. 100 mL was injected inside.

About 5 seconds after the injection, foaming started, and the volume was increased so that the three tubes arranged in the mold were immersed. After the foaming stopped, the internal temperature rose to 135°C, and as soon as it reached the maximum temperature, the temperature started to drop and dropped to 50°C over about 10 minutes.

Inside the obtained cylindrical polyurethane foam, the three tubes exist as tubes with smooth inner peripheral surfaces at the same positions as they were initially placed, and the outer peripheral surfaces of the three tubes are , was fused and integrated with the foamed polyurethane.

When a wire having a diameter of 1.0 mm and a length of 150 mm was passed through the inside of the tube as a guide member, it could be easily passed through the inside of the tube. A flexible lead wire with a diameter of 1.0 mm and a length of 150 mm is fixed to the end of the wire using a heat-shrinkable tube, and the wire is pulled out from the polyurethane foam to remove the inside of the polyurethane foam. It was possible to insert a lead wire as a cable into the tube formed in the .

(Effect on compression strain)
One end of the flexible lead wire inserted into the foamed polyurethane was fixed, and the other end was fixed via a 50 mm long rubber band connection. When a round-bottomed weight weighing 5 kg was placed on the polyurethane foam, the polyurethane foam flexed, and the lead wire was pulled into the tube (rubber band stretched) so as to follow the flexure. . When the weight was removed and the electrical conductivity of the lead wire was confirmed, it was confirmed that the lead wire was not cut and that it could withstand the load of compressive strain.

<Comparative Example 1>
Except for using a tube with a diameter of 2.0 mm and an inner diameter of 1.4 mm made of polystyrene elastomer resin (Tefablock (registered trademark) 4300C, Mitsubishi Chemical Corporation) instead of the thermoplastic polyurethane tube in Example 1. A similar experiment was conducted.

Although three tubes were embedded in the obtained sponge, the outer peripheral surface of the tube and the skeleton of the sponge were not adhered, and the tube could be easily pulled out by pulling the end of the tube. After pulling out, the lumen of the sponge was exposed, and debris and skeletal fragments generated during the pulling out were exposed.

In Comparative Example 1, without pulling out the tube from the obtained foam, a wire was inserted as it was, and the same strain load test as in the Example was performed.

As in Example 1, it was confirmed that the rubber band fixed to one end of the lead wire was pulled due to the smooth lumen surface of the tube, and the lead wire was not broken after loading. On the other hand, the tube was also pulled into the sponge, and it was confirmed that the inner diameter of the tube was narrowed due to the deformation of the tube inside the sponge. Since the tube is not adhered to the sponge, it can be determined that this is the result of the tube being drawn into the sponge and not being completely returned to its original state.

<Reference Example 1A>
Polyol (Sunnix (registered trademark) GP3000U, Sanyo Chemical Industries, Ltd.) 100 parts by weight, isocyanate (Cosmonade T80, Mitsui Chemicals, Inc.) 60 parts by weight, water 5 parts by weight, additive tin catalyst (WG31-NK, Japan) Kagaku Sangyo Co., Ltd.) 0.2 parts by weight, polyol as a solvent for the catalyst (Sunnix (registered trademark) GS3000, Sanyo Chemical Industries Co., Ltd.) 0.8 parts by weight, foam stabilizer (L580/STL, Momentive Performance Materials) 1 part by weight, 3 parts by weight of a foaming agent (dichloromethane, Tokuyama Corporation), and 0.3 parts by weight of an amine catalyst (33LV, Tosoh Corporation) are stirred with a dissolver stirrer for 10 seconds, and quickly formed into the cylindrical mold. 100 mL was injected inside.

About 5 seconds after the injection, foaming started and increased, and stopped after 15 seconds to shift to the systole. After the foaming stopped, the internal temperature rose to 135°C, and as soon as it reached the maximum temperature, the temperature started to drop and dropped to 50°C over about 10 minutes.

An attempt was made to perforate the obtained cylindrical sponge with a tabletop drilling machine fitted with a drill blade with a diameter of 2.0 mm. was torn apart and destroyed so that a As a result, it was not possible to form a lumen with a diameter of 2.0 mm inside the sponge. It is obvious to those skilled in the art that soft sponges exaggerate this phenomenon.

<Reference Example 1B>
The sponge prepared in Reference Example 1A above was placed in an environment of −70° C., and similarly perforated with a drill bit of 2.0 mm using a tabletop drilling machine. Although it was possible to drill without wrapping around the drill bit, it was not possible to form a lumen that was only straight and curved inside. In addition, debris (chips) generated during cutting is captured in the form of powder by the sponge, and is difficult to remove even by using a suction machine.

<Reference Example 1C>
An attempt was made to pierce and insert the wire in the same manner as in Example 1 into the simple straight lumen with a diameter of 2.0 mm prepared in Reference Example 1B above, but the tip of the wire did not reach the hole in the sponge. It was difficult to get caught and insert it. It is self-evident that if the lumen formed in the sponge is not straight but curved, or if the lumen is straight but the length is long, it is very difficult to insert the wire. .

Next, after replacing the wire with a flexible lead wire in the same manner as in Example 1, a bending load test on the lead wire was conducted by loading a heavy object on the sponge. The lead wire is fixed without sliding in the lumen due to friction caused by the unevenness of the lumen formed in the sponge, and the rubber band passed through one end of the lead wire does not stretch and the lead wire is fixed. The wire was pulled in a state as if both ends were fixed, and the wire broke near the center.

1: seat pad 1': seat pad 2: seat pad main body f: surface of seat pad main body f1: front surface of seat pad main body f1a1: front end surface of cushion seat portion f2: side surface of seat pad main body f3: rear surface of seat pad main body f4: bottom surface of seat pad main body f5: inner surface of recess f5a: side surface of recess f5b: bottom surface of recess 2A: cushion pad portion f1a1: front end surface of cushion seat portion f1a2: supporting surface of cushion seat portion f2a: side surface of cushion seat portion f3a: back surface of cushion seat portion f4a: bottom surface of cushion seat portion 2B: back pad portion f1b: supporting surface of back pad portion f2b: Side of back pad f3b: back of back pad f4b: bottom of back pad 2C: headrest f1c: supporting surface of headrest f2c: side of headrest f3c: back of headrest f4c : Bottom surface of headrest part 3: Tube 3f: Outer peripheral surface of tube 4: Cables 5: Storage element 10: Mold 10A: Mold piece

Claims (4)

A seat pad body made of foamed polyurethane resin and a tube embedded in the seat pad body,
The tube is made of polyurethane resin,
The seat pad body is molded integrally with the tube, and at least one end face of the tube is exposed from the surface of the seat pad body,
The tube is a conduit into which cables can be inserted,
A seat pad, wherein the conduit is filled with a lubricating material. 2. The seat pad of claim 1, wherein the tube is positioned along the bearing surface of the seat pad body. 3. A seat pad according to claim 1 or 2 , wherein the tube is arranged in the seat. A method of manufacturing a seat pad according to claim 1, comprising :
A method for manufacturing a seat pad, comprising the step of foaming polyurethane resin in a mold in which the tube made of polyurethane resin is arranged.

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