JP2012085712A - Cushion with built-in duct for vehicle seat and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cushion with a built-in duct for vehicle seats capable of making the unnatural feeling felt by an occupant less than before, and a manufacturing method of the same.SOLUTION: A slab 26 provided at a cushion 14 with a built-in duct becomes a member having a higher elasticity than a vent duct 20 as the resin of a seat pad 16 becomes denser with its rigidity higher than that of general parts when foamed resin (urethane) comprising the seat pad 16 is impregnated and hardened. Then, the slab 26 in which the foamed resin is impregnated is wound around each exhaust cylinder 24, so that when the seat pad 16 is greatly deformed, contact pressure is reduced as the load of the occupant is received not only by the end of the exhaust cylinder 24 but also by the slab 26 in which the foamed resin is impregnated. Also, due to the elasticity which the slab 26 in which the foamed resin is impregnated has, the edge of the exhaust cylinder does not give any unnatural feeling of contact as before to the occupant.

Description

  According to the present invention, a plurality of ventilation recesses are provided in a seat pad with a built-in ventilation duct, and the ventilation duct is communicated with the inner part of the ventilation recess, so that air from a blower or the like is sent from the ventilation recess to the seated person through the ventilation duct. The present invention relates to a vehicle seat duct built-in cushion that can be supplied and a method of manufacturing the same.

  This type of vehicle seat duct built-in cushion has a structure in which a plurality of exhaust cylinder portions provided in the ventilation duct are arranged in the back of the ventilation recess (for example, see Patent Documents 1 and 2).

JP-A-3-297414 (FIGS. 2 and 4)

Japanese Utility Model Publication No. 61-159209 (FIG. 7)

  However, in the conventional cushion with a built-in duct for a vehicle seat, depending on the seating posture of the seated person, the seat pad may be greatly compressed and deformed, and the leading end of the exhaust tube portion may come into contact with the seated person, causing a sense of incongruity. On the other hand, although what has a flange at the tip of the exhaust tube portion to increase the contact area with respect to the seated person has been proposed (see FIG. 4 of Patent Document 1), the exhaust tube portion is also configured in such a configuration. In some cases, the edge of the abutment might contact the seated person, and the uncomfortable feeling could not be reduced sufficiently.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a vehicle seat duct built-in cushion and a method for manufacturing the same that can reduce the uncomfortable feeling a seated person can feel.

  The vehicle seat duct built-in cushion according to the invention of claim 1 made to achieve the above object is provided with a plurality of vent recesses in a seat pad made of molded foam resin containing a vent duct, and the interior of the vent recesses is provided. A cushion with a built-in duct for a vehicle seat, in which a plurality of exhaust cylinder parts provided in the ventilation duct are arranged in the part, and air can be supplied to the seated person from the ventilation recess through the ventilation duct, and the tip part of each exhaust cylinder part The slab urethane is characterized in that a part of or all of the slab urethane is wound around the slab urethane and the foamed resin constituting the seat pad is impregnated in the slab urethane.

  According to a second aspect of the present invention, in the vehicle seat duct built-in cushion according to the first aspect, a pad cylinder covering the outer peripheral surface of the slab urethane wound around the exhaust cylinder portion on the inner surface of the ventilation recess of the seat pad. It is characterized in that the portion is formed to protrude.

  According to a third aspect of the present invention, there is provided a method of manufacturing a cushion with a built-in duct for a vehicle seat, wherein a plurality of ventilation recesses are provided in a seat pad made of a molded foam resin containing a ventilation duct, In the method for manufacturing a cushion with a built-in duct for a vehicle seat, in which a plurality of exhaust cylinder portions are arranged and air can be supplied from the ventilation recess to the seated person through the ventilation duct, a part or the whole including the tip portion of the exhaust cylinder portion Wrap the open-cell slab urethane around the end, and hold the exhaust tube and the end face of the slab urethane against the end face of the recess molding projection for forming the vent recess in the foam mold for seat pad molding. A foam raw material is filled in a foam molding die, and a foam resin constituting the seed pad is impregnated into slab urethane while foaming the seat pad. Having the features.

  According to a fourth aspect of the present invention, in the method for manufacturing the vehicle seat duct built-in cushion according to the third aspect, the surrounding molding wall surrounding the slab urethane wound around the exhaust tube portion is provided on the end surface of the concave molding protrusion. Further, the present invention is characterized in that a foaming raw material in the middle of foaming is caused to flow between the inner peripheral surface of the concave molding protrusion and the outer peripheral surface of the slab urethane.

[Invention of Claim 1]
The slab urethane provided in the vehicle seat duct built-in cushion according to claim 1 is impregnated with a foamed resin constituting the seat pad and hardened, so that the resin becomes denser than the general part of the seat pad and the rigidity is increased, and ventilation is performed. It becomes a member with higher elasticity than the duct. In the vehicle seat duct built-in cushion according to the present invention, the slab urethane impregnated with the foamed resin is wound around each exhaust tube portion. The person's load is received not only by the tip of the exhaust tube part but also by the slab urethane impregnated with the foamed resin, and the contact pressure is reduced. Further, the elasticity of the slab urethane impregnated with the foamed resin does not give the uncomfortable feeling that the edge of the exhaust tube portion comes into contact with the seated person unlike the conventional case. As a result, the uncomfortable feeling given to the seated person by the exhaust tube portion of the ventilation duct can be eliminated or reduced as compared with the prior art. Further, according to the structure of the vehicle seat duct built-in cushion according to claim 1, the seat pad is molded simply by winding ordinary slab urethane not impregnated with foamed resin around the exhaust tube portion before molding the seat pad. However, since the foamed resin constituting the seat pad can be impregnated in the slab urethane, it can be manufactured at low cost. Moreover, at that time, the slab urethane also serves to prevent the foaming raw material from entering the exhaust cylinder part by surrounding the gap between the tip of the exhaust cylinder part and the end surface of the concave molding protrusion from the outside. Further, since the slab urethane is integrated with the seat pad by impregnating the foamed resin, it does not come off from the exhaust tube portion.

[Invention of claim 2]
The vehicle seat duct built-in cushion according to claim 2 is provided with a pad cylinder portion covering the outer peripheral surface of the slab urethane wound around the exhaust cylinder portion, so that the foam raw material constituting the seat pad is formed when the seat pad is molded. The foamed resin contained can be impregnated from the entire outer peripheral surface of the slab urethane. Moreover, when manufacturing the cushion with a built-in duct for a vehicle seat according to claim 2, the surrounding molding wall is provided in the foaming mold so as to surround the slab urethane with a gap, so that the slab urethane is formed by the surrounding molding wall. The flow pressure of the foaming raw material in the middle of foaming is relieved, and the slab urethane is prevented from peeling from the exhaust tube.

[Invention of claim 3]
The slab urethane which the cushion with a built-in duct for vehicle seats manufactured by the manufacturing method according to claim 3 impregnates and cures with the foam resin of the seat pad, so that the foam resin becomes denser than the seat pad and the rigidity becomes higher and the ventilation is improved. It becomes a member with higher elasticity than the duct. And, in the vehicle seat duct built-in cushion manufactured by the manufacturing method of claim 3, since the slab urethane impregnated with such a foamed resin is wound around each exhaust tube portion, the seat pad is greatly deformed In addition, the load of the seated person is received not only by the exhaust tube portion but also by the slab urethane impregnated with the foamed resin, and the contact pressure is reduced. Further, the elasticity of the slab urethane impregnated with the foamed resin does not give the uncomfortable feeling that the edge of the exhaust tube portion comes into contact with the seated person unlike the conventional case. As a result, the uncomfortable feeling given to the seated person by the exhaust tube portion of the ventilation duct can be eliminated or sufficiently reduced as compared with the prior art. In addition, according to the manufacturing method of claim 3, by simply winding a normal slab urethane not impregnated with a foamed resin around the exhaust tube portion before forming the seat pad, the seed pad is formed while forming the seat pad. Since the slab urethane can be impregnated with the foamed resin to be formed, it can be manufactured at low cost. Moreover, at that time, the slab urethane also serves to prevent the foaming raw material from entering the exhaust cylinder part by surrounding the gap between the tip of the exhaust cylinder part and the end surface of the concave molding protrusion from the outside. Moreover, since the slab urethane impregnated with the foamed resin is integrated with the seat pad, the slab urethane is not detached from the exhaust tube portion.

[Invention of claim 4]
In the manufacturing method of Claim 4, the flow pressure of the foaming raw material in the middle of foaming with respect to slab urethane is relieved by the surrounding molding wall provided on the end surface of the concave molding projection, and the slab urethane is prevented from peeling off from the exhaust tube. Moreover, the foaming raw material in the middle of foaming can flow between the inner peripheral surface of the surrounding molding wall and the outer peripheral surface of the slab urethane, and the foamed resin can be impregnated from the entire outer peripheral surface of the slab urethane.

1 is a transparent perspective view of a vehicle seat according to an embodiment of the present invention. Side sectional view of the duct built-in cushion Partial enlarged side sectional view of the duct built-in cushion Perspective view of ventilation duct and slab Side cross-sectional view of the open mold state of the foam mold Side cross-sectional view of the closed mold mold mold Side cross-sectional view of recessed molding projection Partially enlarged side sectional view of a duct built-in cushion according to the present invention of Modification 1 Partial enlarged side sectional view of the duct built-in cushion according to the present invention of Modification 2

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. A vehicle seat 10 shown in FIG. 1 includes a seating portion 11 generally called a “seat cushion”, a backrest portion 12 called a “seat back”, and a headrest 13. The seating portion 11 and the backrest portion 12 cover the surfaces of the vehicle seat duct built-in cushions 14 and 15 (hereinafter referred to as “duct built-in cushions 14 and 15”) according to the present invention with a decorative cover (not shown). Further, these cushions 14 and 15 with a built-in duct have a structure in which, for example, a vent pad 20 or 40 which is a blow molded product of polyolefin resin is incorporated in a seat pad 16 or 17 which is a molded foam product of urethane, for example. .

  Hereinafter, the structure of the duct built-in cushion 14 of the seating portion 11 will be described in detail. The ventilation duct 20 incorporated in the duct built-in cushion 14 includes a duct main body 20H having an overall H shape, for example, as shown in FIG. The duct main body portion 20H is embedded in a position near the lower surface of the seat pad 16, and the pair of vertically long side portions 21 and 21 in the H shape of the duct main body portion 20H extend in the front-rear direction of the vehicle seat 10. In addition, an introduction pipe 23 extends downward from a central portion of the horizontally long side portion 22 in the H-shape of the duct main body portion 20H, and an introduction port (not shown) is opened at a lower end surface thereof. Further, a fixing flange 23F protrudes laterally from the lower end of the introduction pipe 23, and the lower surface of the fixing flange 23F is exposed from the lower surface of the seat pad 16. A relay duct (not shown) extending from the blower is fixed to the fixing flange 23F, and air is sent into the ventilation duct 20.

  A plurality of cylindrical exhaust tube portions 24 project from the upper surfaces of the vertical long side portions 21 and 21 and the horizontal long side portion 22 of the duct main body portion 20H. The exhaust cylinder portion 24 is a cut residue formed by blow molding, which is formed by cutting the tip of a so-called “disposal bag”, and the front end surface of the exhaust cylinder portion 24 serves as an exhaust port 24A. In addition, as shown in FIG. 2, a plurality of ventilation recesses 25 are formed in a recessed manner on the upper surface of the seat pad 16, and the exhaust tube portion 24 is located at the back of each ventilation recess 25. Then, air is discharged from each exhaust cylinder portion 24 and is sent to the seated person through the ventilation recess 25.

  In FIG. 3, the cross-sectional shapes of the exhaust tube portion 24 and the vent recess 25 are shown enlarged. As shown in the figure, the ventilation recess 25 is, in order from the upper end to the lower end, a chamfer opening 25A, a small-diameter portion 25B, a tapered portion 25C, and a large-diameter portion 25D, and the lower back portion becomes wider. ing. The duct main body portion 20H is embedded below the bottom surface 25E of the ventilation recess 25 in the seat pad 16, and the upper portion of the exhaust cylinder portion 24 protrudes upward from the center of the bottom surface 25E of the ventilation recess 25. Yes.

  Now, as for the exhaust cylinder part 24, the whole outer peripheral surface is covered with the slab cylinder 26T. The slab cylinder 26T is thicker than the exhaust cylinder part 24, and the upper surface of the slab cylinder 26T and the upper surface of the exhaust cylinder part 24 are flush with each other. And the pad cylinder 27 which covers the part which protruded upward from the bottom face 25E with the exhaust cylinder part 24 among the slab cylinder 26T from the outer side is integrally molded by the bottom face 25E of the ventilation | gas_flowing recessed part 25. FIG.

  Here, the slab cylinder 26T is formed by winding the open-cell urethane slab 26 (so-called slab urethane) shown in FIG. 4 (A) around the exhaust cylinder part 24 as shown in FIG. 4 (B). 26 is impregnated with urethane constituting the seat pad 16 (corresponding to “foamed resin” according to the present invention). In this manner, the slab 26 is a member that is impregnated with urethane constituting the seat pad 16 so that the urethane becomes denser than the seat pad 16 and has higher rigidity and higher elasticity than the ventilation duct 20. The slab 26 is integrated with the seat pad 16 and fixed to the exhaust cylinder portion 24 by impregnation with urethane.

  The description regarding the structure of the duct built-in cushion 14 of the seating part 11 has been described above. The duct built-in cushion 14 is manufactured as follows. That is, in order to manufacture the duct built-in cushion 14, a double-sided tape is attached to the slab 26 described above in advance. And the slab 26 which affixed the double-sided tape is affixed on the outer peripheral surface of each exhaust pipe part 24 of the ventilation duct 20 (refer FIG. 4 (A) and FIG. 4 (B)). At this time, if the end portion of the slab 26 is pasted from the tip of the exhaust tube portion 24, the exhaust tube portion 24 of the slab 26 is fixed when the ventilation duct 20 is fixed to the foaming mold 50. The portion protruding from the tip can be crushed and the opening of the exhaust cylinder portion 24 can be reliably sealed. Further, at the stage where the slab 26 is attached to the exhaust cylinder portion 24, the slab 26 is not impregnated with foamed resin for forming the seat pad 16. After the slabs 26 are attached to all the exhaust cylinder portions 24, the ventilation duct 20 is set in the foaming mold 50 for molding the seat pad 16 shown in FIG.

  The foam molding die 50 of the present embodiment is opened in the vertical direction, and the seat pad 16 is molded with the foam molding die 50 being turned upside down. Specifically, a plurality of recess molding projections 53 for projecting the vent recess 25 into the upper surface of the seat pad 16 project from the bottom surface 52A of the cavity 52 in the lower fixed mold 51 of the foam molding die 50. ing. One of them, the concave molding protrusion 53, is shown enlarged in FIG. As shown in FIG. 7, the concave molding protrusion 53 includes a chamfering molding part 53A, a small diameter molding part 53B, a taper molding part 53C, and a large diameter molding part 53D in order from the lower end to the upper end. Thus, the chamfer opening 25A, the small diameter portion 25B, the taper portion 25C, and the large diameter portion 25D (see FIG. 3) of the ventilation recess 25 are formed.

  Further, the upper end surface of the recessed portion forming protrusion 53 is entirely depressed leaving the outer edge portion, and as a result, the outer peripheral edge of the upper end portion of the recessed portion forming protrusion 53 is provided with a cylindrical surrounding forming wall 54. Further, a clip for fixing the ventilation duct 20 protrudes from the center of the portion surrounded by the surrounding molding wall 54 on the upper surface of the concave molding protrusion 53. The clip includes a pair of arm portions 55 and 55 protruding in parallel upward. Further, the distal end portions of these arm portions 55, 55 are provided with a substantially right triangle shaped locking projections 56, 56 protruding in opposite directions. The arm portions 55 and 55 have elasticity, and the ventilation duct 20 can be detachably attached to the foam molding die 50 by being inserted into the exhaust tube portions 24 of the ventilation duct 20.

  Therefore, the arm portions 55 and 55 are inserted into the exhaust tube portions 24 of the ventilation duct 20. Then, the lower end locking surface 56A of the locking projections 56, 56 is locked to the inner surface of the duct main body 20H, the ventilation duct 20 is pulled down, and the leading end surfaces of the exhaust cylinder portion 24 and the slab cylinder 26T are formed into the recess forming projection 53. The surface is held in contact with the upper surface. Thereby, the exhaust port 24A of the exhaust cylinder portion 24 is closed. Further, in this state, the surrounding forming wall 54 is in a state of surrounding the slab tube 26T via the annular forming space 54K and being abutted against the duct body 20H with a gap.

  In this state, a foam material for seat pad is injected into the lower fixed mold 51 of the foam molding die 50. Next, as shown in FIG. 6, the upper movable mold 57 of the foam mold 50 is lowered to close the foam mold 50. Then, the distal end of the introduction pipe 23 in the ventilation duct 20 comes into contact with the inner surface 58A of the cavity 58 of the upper movable mold 57, and the introduction port at the distal end of the introduction pipe 23 is closed. And a foaming raw material foams gradually. In the process, the foam raw material (foamed resin) in the middle of foaming is impregnated into the slab 26 from the foam raw material.

  The resin in the middle of foaming impregnated in the slab 26 is cured while its density is high within the cell of the slab 26 and foaming is restricted. Thereby, the rigidity of the slab cylinder 26T is higher than that of the general portion of the seat pad 16. At this time, since the slab cylinder 26T is surrounded by the surrounding molding wall 54 of the foam molding die 50, the flow pressure of the foaming raw material against the slab 26 is relaxed, and the slab 26 may be peeled off from the exhaust cylinder part 24. It is prevented. Further, since the annular molding space 54K is provided between the inner peripheral surface of the surrounding molding wall 54 and the slab cylinder 26T, the foaming raw material in the middle of foaming flows into the annular molding space 54K, and the outer peripheral surface of the slab cylinder 26T. The foam resin for seed pad can be efficiently impregnated from the whole. The seed pad foamed resin preferably reaches the inner peripheral surface of the slab cylinder 26T in terms of rigidity of the slab cylinder 26T, but may not reach the inner peripheral surface of the slab cylinder 26T.

  Next, the foamed foaming material (foamed resin) is spread throughout the foam molding die 50, the curing reaction is terminated in the foam molding die 50, and the seed pad 16 is molded. When the foam molding die 50 is opened and the seat pad 16 is taken out, the duct built-in cushion 14 in which the ventilation duct 20 is built in the seat pad 16 is completed.

  The description regarding the duct built-in cushion 14 of the seating portion 11 has been described above. Next, the structure of the duct built-in cushion 15 of the backrest 12 will be briefly described. As shown in FIG. 1, the ventilation duct 40 built in the duct built-in cushion 15 includes, for example, a vertically long pipe 41 extending in the vertical direction at the center in the width direction of the duct built-in cushion 15. A pair of horizontally long tubes 42, 42 extend from the position to the left and right. Further, an exhaust tube portion 44 similar to the above-described exhaust tube portion 24 is formed on the front surface of each horizontally long tube 42, and the above-described vent recesses are formed on the front surface of the seat pad 17 so as to correspond to the exhaust tube portions 44. A vent recess (not shown) similar to 25 is formed in a recessed manner. Furthermore, the introduction pipe 43 extends rearward from the lower end portion of the vertically long pipe 41, and a fixing flange 43 </ b> F projecting laterally from the tip of the introduction pipe 43 is exposed on the rear surface of the seat pad 17. A relay duct from the blower is connected to the fixed flange 43F, and air can be fed from each exhaust tube portion 44 of the ventilation duct 40 toward the back of the seated person through the ventilation recess. Further, the exhaust cylinder portion 44 and the ventilation recess portion in the duct built-in cushion 15 have the same structure as the exhaust cylinder portion 24 and the ventilation recess portion 25 in the duct built-in cushion 14 of the seating portion 11 shown in FIG. The 12 duct built-in cushions 15 are also manufactured in the same manner as the duct built-in cushion 14 of the seating portion 11 described above.

  The description about the structure and manufacturing method of the duct built-in cushions 14 and 15 of this embodiment is above. Next, the effect of the duct built-in cushions 14 and 15 of this embodiment will be described. As described above, the slab 26 provided on the duct built-in cushion 14 of the seating portion 11 is impregnated with the foamed resin (urethane) constituting the seat pad 16 and hardened so that the resin becomes denser than the general portion of the seat pad 16. Therefore, the member is provided with higher rigidity and higher elasticity than the ventilation duct 20. Since the slabs 26 impregnated and cured with such a foamed resin are wound around the exhaust tube portions 24, when the seat pad 16 is greatly deformed, the load of the seated person is only on the tip of the exhaust tube portion 24. In addition, the contact pressure is reduced by the slab 26 impregnated with the foamed resin. Further, the elasticity of the slab 26 impregnated with the foamed resin does not give the uncomfortable feeling that the edge of the exhaust tube portion contacts the seated person as in the conventional case. As a result, the uncomfortable feeling given to the seated person by the exhaust tube portion 24 of the ventilation duct 20 can be eliminated or reduced as compared with the conventional case.

  Further, according to the structure of the duct built-in cushion 14 of the present embodiment, a normal slab 26 not impregnated with foamed resin (urethane) is wound around the exhaust tube portion 24 before the seat pad 16 is molded, and the seat Since the foamed resin constituting the seat pad can be impregnated in the slab 26 while the pad 16 is formed, the pad 16 can be manufactured at low cost. In addition, at that time, the slab 26 surrounds the gap between the tip of the exhaust cylinder part 24 and the end surface of the concave molding protrusion 53 from the outside (see FIG. 7), and the foaming raw material enters the exhaust cylinder part 24. Also serves as a sealing material to prevent this.

  Further, since the slab 26 is integrated with the seat pad 16 by impregnating the foamed resin, the slab 26 is not detached from the exhaust tube portion 24. The duct built-in cushion 15 of the backrest 12 also has the same effect as the duct built-in cushion 14 of the seating part 11 described above.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) Although the slab 26 of the above embodiment covers the entire outer peripheral surface of the exhaust cylinder part 24, it may cover only the tip part of the exhaust cylinder part 24 like the slab 60 shown in FIG.

  (2) Although the slab 26 of the above embodiment is covered with the pad cylinder 27 on the outside, the outer peripheral surface may be exposed in the ventilation recess 25 as in the slab 60 shown in FIG.

  (3) The exhaust cylinder portion 24 and the slab 26 of the above-described embodiment are partially protruded from the bottom surface 25E of the ventilation recess 25. As shown in FIG. The entire exhaust tube portion 24 and the slab 26 may be embedded in the seat pad 16 so as to be flush with the bottom surface 25E.

  (4) In the vehicle seat 10 of the above-described embodiment, the present invention is applied to the duct built-in cushions 14 and 15 of both the seating portion 11 and the backrest portion 12, but the present invention is applied to only one of them. You may apply.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 14,15 Duct built-in cushion 16,17 Seat pad 20,40 Ventilation duct 24,44 Exhaust cylinder part 25 Ventilation recessed part 26,60 Slab 27 Pad cylinder 50 Foam molding die 53 Concave molding protrusion 54K Surrounding molding wall 54K Annular molding space

Claims (4)

A plurality of ventilation recesses are provided in a sheet pad made of molded foam resin containing a ventilation duct, and a plurality of exhaust tube portions provided in the ventilation duct are arranged at the back of the ventilation recess, and air is passed through the ventilation duct. A cushion with a built-in duct for a vehicle seat that can be fed from a ventilation recess to a seated person,
A vehicle characterized in that open-slab urethane slab urethane is wound around a part or the whole of the exhaust pipe portion including the tip thereof, and the slab urethane is impregnated with a foamed resin constituting the seat pad. Seat cushion with built-in duct.   The pad cylinder part which covered the outer peripheral surface of the said slab urethane wound around the said exhaust cylinder part is protruded and formed in the inner surface of the said ventilation recessed part among the said seat pads. Duct cushion for vehicle seats. A plurality of ventilation recesses are provided in a sheet pad made of molded foam resin containing a ventilation duct, and a plurality of exhaust tube portions provided in the ventilation duct are arranged at the back of the ventilation recess, and air is passed through the ventilation duct. In the method for manufacturing a cushion with a built-in duct for a vehicle seat that can be fed from a ventilation recess to a seated person,
An open-cell slab urethane is wound around a part or the whole of the exhaust cylinder part including the tip part, and the exhaust cylinder part is formed on an end surface of a recess molding projection for forming a vent recess in a foam molding die for forming a seat pad. And holding the end face of the slab urethane in a pressed state, filling the foaming mold with a foaming raw material, and impregnating the slab urethane with the foamed resin constituting the seed pad while foam-molding the seat pad A method for manufacturing a cushion with a built-in duct for a vehicle seat, characterized by comprising:   An encircling molding wall surrounding the slab urethane wound around the exhaust tube portion is provided on the end surface of the concave molding protrusion, and between the inner peripheral surface of the concave molding protrusion and the outer peripheral surface of the slab urethane. 4. The method for manufacturing a vehicle seat duct built-in cushion according to claim 3, wherein a foaming material in the middle of foaming is caused to flow into the vehicle seat.

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