JP6101192B2 - Vehicle seat and method for manufacturing vehicle seat - Google Patents

Description

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

In a vehicle seat cushion or a seat back, a foam that can be deformed by receiving a load from an occupant is used as a member constituting a vehicle seat pad.
Moreover, according to the following patent documents 1 and 2, the linear member is embed | buried by the insert molding in the foam which comprises the vehicle seat pad. And the locking tool provided in the outer skin latches to a linear member, and the outer skin which covers a vehicle seat pad does not shift.
Furthermore, a plurality of locking tools provided on the skin are provided on the back side of the skin along the stitch (seam). For this reason, when the load from the occupant is released and the vehicle seat pad returns to its original shape, the stitches extend along the linear member, and the skin between the stitches also extends to suppress the occurrence of wrinkles. It has become.

  By the way, in patent document 1, the steel wire is used as a linear member. In order to prevent the steel wire from being displaced due to foaming of the foam material during insert molding, the steel wire is fixed by the magnetic force of the magnet.

JP 2008-194957 A JP-A-8-206376

However, from the viewpoint of reducing the weight of the vehicle seat pad, it is desirable to use a resin wire having a specific gravity smaller than that of the steel wire as the linear member.
On the other hand, when using a resin wire, it cannot fix with the magnetic force of a magnet as disclosed by patent document 1, and there exists a possibility that a resin wire may shift position.
On the other hand, in patent document 2, although the resin wire is used as a linear member, the fixing method of the resin wire is not disclosed.

Therefore, the present invention is an invention created in view of the above-described background, and provides a vehicle seat that is insert-molded in a foam without a resin wire being displaced, and a method for manufacturing the vehicle seat. Is an issue.

As means for solving the problems, a vehicle seat according to the present invention covers a foam, a vehicle seat pad including a resin wire insert-molded in the foam, and the foam. and the skin, is provided on the skin, a vehicle seat and a securing portion secured to the resin wire, the foam, the locking of the skin covering the foam a plurality of recesses are provided for locking the parts to the resin wire, wherein the plurality of recesses are formed by projecting from the cavity surface of the mold omission traces plurality of projections for sandwiching the resin wire The concave portion is provided on a side of the protruding portion corresponding to a mounting surface on which the resin wire is mounted, and on the opposite side of the mounting surface with the resin wire sandwiched in the protruding portion. On top of the wire A surface corresponding to the contact surface that comes into contact, and the locking portion surrounds the surface corresponding to the resin wire and the contact surface and is provided to pass through the surface corresponding to the recess and the mounting surface. It is characterized by being a C-ring.

According to the vehicle seat pad according to the invention, the resin wire is sandwiched between the plurality of projecting portions at the time of insert molding. For this reason, it is fixed at a predetermined position in the cavity, and the resin wire is insert-molded into the foam without being displaced.
Further, according to the vehicle seat pad according to the invention, the foam is provided with a plurality of recesses, and the positioning of the locking position for locking the stopper of the skin with respect to the resin wire is facilitated. Yes.

  Further, the plurality of recesses are provided at least three offset in the axial direction of the resin wire, and two of the at least three recesses are provided on one side of the resin wire, and the 2 One recess between the two recesses is preferably provided on the other side of the resin wire.

  According to the said structure, regarding the direction which makes the latching | locking part of an outer skin approach into a recessed part and is made to latch on a resin wire, two latching | locking parts become from the one side of a resin wire. On the other hand, the latching | locking part provided between the two latching | locking parts becomes from the other side of the resin wire, and latches from the direction different from two latching | locking parts.

Moreover, as a means for solving the above-described problems, a vehicle seat manufacturing method according to the present invention includes a foam, a vehicle seat pad including a resin wire insert-molded in the foam, and the foam. and a skin covering the body, is provided on the skin, and a securing portion secured to the resin wire, the foam, the locking portion of the skin that engages into the resin wire A method for manufacturing a vehicle seat in which a concave portion is formed, in which a mold is prepared by sandwiching the resin wire between a plurality of protrusions protruding from a cavity surface, and the mold After the preparation process, a foam material introduction process for introducing a foam material into the mold, a foaming process for heating and foaming the foam material after the foam material introduction process, and after the foaming process, A mold extraction process to extract from the mold A step of covering the foam with the skin and locking the locking portion to the resin wire, and the projecting portion sandwiches the resin wire with a mounting surface on which the resin wire is mounted The contact surface is provided on the opposite side of the mounting surface and contacts the upper portion of the resin wire, and the contact surface of the protruding portion is disposed on the opposite side across the resin wire. In cooperation with the abutment surface of the protrusion, the upward movement of the resin wire during the foaming process is restricted, and the foam is removed from the plurality of protrusions by the traces of the plurality of protrusions in the mold drawing process. In the step of covering the foam with the skin and locking the locking portion to the resin wire, the locking portion that is a C-ring corresponds to the resin wire and the contact surface. Surrounding the surface to be And which are located so as to pass through the corresponding surface to the mounting surface.

According to the vehicle seat pad manufacturing method of the present invention, the resin wire can be prevented from being displaced during insert molding by sandwiching the resin wire by the plurality of protrusions.
Moreover, according to the manufacturing method of the vehicle seat pad which concerns on the said invention, since the recessed part is formed by several protrusion part, the process of cutting the surface of a foam and forming a recessed part can be skipped.
Moreover, according to the said structure, even if a foam material foams between the resin wire mounted in the mounting surface, and a cavity surface, and a resin wire is pressed upwards, it does not move. For this reason, the resin wire is insert-molded without being displaced upward.

  Further, the mold is provided with at least three or more projecting portions with respect to one resin wire, and the at least three or more projecting portions are arranged so as to be shifted in the axial direction of the resin wire. Of the at least three or more protrusions, two protrusions are provided on one side of the resin wire, and one protrusion between the two protrusions is provided on the other side of the resin wire. It is preferable that

For example, when a plurality of projecting portions are disposed to face each other with a resin wire interposed therebetween, the foam foamed between the projecting portions disposed to face each other may be pulled by the projecting portions at the time of die cutting and the foam may be damaged. .
On the other hand, according to the said structure, since the some protrusion part has shifted | deviated and arrange | positioned in the direction where a resin wire is extended, the possibility that a protrusion part may pull a foam at the time of mold release and a foam may be damaged can be avoided. In addition, according to the above-described configuration, even if the center portion or the end portion of the resin wire receives a force toward the side not in contact with the protruding portion, the resin wire is not displaced due to the elastic force of the resin wire.

  Moreover, it is preferable that the said contact surface is a slope which inclines upwards as seeing the said resin wire from an axial direction toward the center part of the said resin wire from the side of the said resin wire.

  According to the above configuration, when the resin wire is pulled upward together with the foam in the die cutting process, the resin wire can move upward along the slope and can be detached from the plurality of protrusions.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the vehicle seat pad by which the resin wire insert-molded to the foam without being displaced, and the vehicle seat pad can be provided.

It is the perspective view which looked at the vehicle seat which concerns on embodiment from the upper left front side. It is the top view which planarly viewed the vehicle seat pad. 2A is a cross-sectional view taken along line AA in FIG. 2, FIG. 2B is a cross-sectional view taken along line BB in FIG. 2, and FIG. 2C is a cross-sectional view taken along line CC in FIG. (D) is sectional drawing of the DD line of FIG. 2 at the arrow view. It is the cross-sectional perspective view which looked at the cross section which cut | disconnected the resin wire. It is sectional drawing which shows the state which C ring of the outer skin latched to the resin wire. It is the top view which planarly viewed the lower mold | type. It is the perspective view which looked at the resin wire clamped by the protrusion part of 3 sets. (A) is a cross-sectional view taken along line EE in FIG. 6, (b) is a cross-sectional view taken along line GG in FIG. 6, and (c) is a cross-sectional view taken along line HH in FIG. It is. It is sectional drawing which carried out the cross sectional view of the protrusion part by which the opposing arrangement | positioning which concerns on a modification was carried out. It is the top view which planarly viewed the one set of protrusion part which concerns on a modification.

  Next, embodiments of the present invention will be described with reference to the drawings. In the embodiment, an example in which the present invention is applied to a seat cushion 2 of a vehicle seat 1 will be described. In addition, this invention is not limited to the seat cushion 2, You may apply to the seat back 3 which comprises the vehicle seat 1. FIG.

  As shown in FIG. 1, the seat cushion 2 is a member constituting a seat surface on which a vehicle occupant sits down, and includes a vehicle seat pad 4 that forms a seat surface substantially parallel to the floor F, and a vehicle seat. And a skin 5 for covering and decorating the pad 4.

As shown in FIGS. 1 and 2, the vehicle seat pad 4 includes a foam 6 having a substantially rectangular shape in plan view, and a plurality of resin wires 7 arranged along the stitches 5 a of the skin 5.
The foam 6 is relatively soft and can be deformed into a shape that conforms to the body shape, such as the waist of the occupant seated by being sunk by the occupant sitting.
The foam 6 is formed in a desired shape by foaming a foam material (urethane raw material) in the cavity of the mold.
Further, as shown in FIGS. 2 and 3 (a) to 3 (d), a resin wire 7 is embedded on the upper surface side of the foam 6 (see particularly FIG. 3 (a)), and A plurality of recesses 8 are formed to open toward the embedded resin wire 7 (see particularly FIGS. 3B to 3D).
In addition, a tension | tensile_strength protrudes in the part by which the resin wire 7 was embed | buried in the upper surface of the foam 6. FIG.

The recess 8 is a hole for allowing the C-ring 5d, which is a locking portion provided on the back side of the skin 5, to enter and lock the C-ring 5d to the resin wire 7 (see FIG. 5).
In addition, the recesses 8 are provided as a set of three for one resin wire 7.
In the present embodiment, there are a resin wire 7 extending in the left-right direction and a resin wire 7 extending in the front-rear direction. In the description of the recess 8 below, three resin wires 7 provided for the resin wire 7 extending in the left-right direction are provided. The recess 8 will be described as an example.

As shown in FIG. 2, the three recesses 8 constituting one set have a left recess 8 a and a center recess 8 b provided to overlap the left part, the center part, and the right part of the resin wire 7 in plan view. The right concave portion 8c is used.
Further, each of the left concave portion 8a, the central concave portion 8b, and the right concave portion 8c corresponds to a C ring 5d provided on the back surface side of the skin 5, and positioning when the C ring 5d is locked to the resin wire 7 is performed. Has become easier.

As shown in FIGS. 3B to 3D, the left concave portion 8a and the right concave portion 8c are formed in the same shape, and the left concave portion 8a, the right concave portion 8c, and the central concave portion 8b are center lines extending vertically. As shown in FIG. Therefore, in the description of the shape of the recess 8, the left recess 8 a will be described as a representative example.
The left recess 8 a includes an opening 9 that opens between the upper surface of the foam 6 and the resin wire 7, and a groove 10 that extends downward from the opening 9 and extends below the resin wire 7.
The opening 9 is formed larger than the diameter of the resin wire 7 so that the C-ring 5d can easily enter. The groove 10 is a space for facilitating the locking of the C-ring 5d by turning one end of the C-ring 5d downward of the resin wire 7.
In addition, the groove part 10 of the left recessed part 8a and the right recessed part 8c is formed in the back side rather than the resin wire 7, and the direction which makes one end of the C ring 5d enter into the groove part 10, and is locked to the resin wire 7 is forward. It has become.
On the other hand, the groove portion 10 of the central portion 8b is formed in front of the resin wire 7, and the direction in which one end of the C-ring 5d enters the groove portion 10 and is locked to the resin wire 7 is the rear, It is opposite to the two C-rings 5d.

As shown in FIG. 4, the resin wire 7 is a linear member having a diameter of 1 mm to 5 mm in which a plurality of long fibers 7a are impregnated with a resin 7b and the plurality of long fibers 7a are integrated by curing the resin 7b.
The resin wire shown in FIG. 4 is drawn with the upper half cut away in order to explain the inside of the resin 7b.
The resin wire 7 has a relatively high rigidity and maintains a linear shape by an elastic force even when the resin wire 7 is pressurized by foaming of the foam material.
Moreover, inorganic fiber or organic fiber is mentioned as the above-mentioned long fiber 7a. Inorganic fibers include glass fibers, basalt fibers, and carbon fibers, and organic fibers include polyester fibers, polyethylene naphthalate fibers, and aramid fibers.
Examples of the resin 7b impregnated into the long fibers 7a include polypropylene resin, nylon 6, nylon 12, polyamide resin including nylon 6-6, and polyester resin.
In addition, the outer peripheral surface of the resin wire 7 is preferably subjected to any one of atmospheric plasma treatment, flame treatment, corona treatment, and primer treatment using chlorinated polypropylene. This is because the adhesiveness between the resin wire 7 and the foam is increased.

  As shown in FIG. 5, the skin 5 is a bag-like member formed by stitching the ends of a plurality of cover pieces 5b. Moreover, the edge part of the cover piece 5b sewn is sewn in the state bent to the back surface side of the outer skin 5. FIG. Therefore, the stitched portion 5 c is hidden on the back side of the skin 5, while the stitch 5 a appears on the surface side of the skin 5.

A C-ring 5 d is provided at the stitched portion 5 c of the epidermis 5 as a locking tool that locks the resin wire 7. A plurality of the C-rings 5d are provided along the stitched portion 5c, in other words, along the stitch 5a. For this reason, the relative displacement of the skin 5 with respect to the vehicle seat pad 4 is prevented, and the stitch 5a extends along the linear member, so that the skin 5 is less likely to be wrinkled.
In the embodiment, a description is given using the skin 5 formed by stitching a plurality of cover pieces 5b. However, the present invention is not limited to this, and the middle portion of the cloth member is folded into a valley shape and stitched. Then, the skin 5 in which the stitch 5a is formed may be used.

Next, a method for manufacturing the vehicle seat pad 4 will be described.
The manufacturing method of the vehicle seat pad 4 is performed in the order of a mold preparation step, a foam material introduction step, a foaming step, and a die cutting step.

In the mold preparation step, a release material is sprayed on a mold set at a predetermined position, and a resin wire 7 is arranged on the mold.
As shown in FIG. 6, the mold according to the present embodiment includes an upper mold (not shown) and a lower mold 20, and the lower mold 20 molds the upper side of the vehicle seat pad 4, The lower side of the vehicle seat pad 4 is molded by the upper mold (not shown).

  As shown in FIG. 6, the lower mold | type 20 is a metal block by which the upper part was open | released, and the die cutting direction which extracts a molding is upward. The bottom surface 20a of the lower mold 20 is a surface constituting a cavity surface that forms the upper surface of the vehicle seat pad 4, and a plurality of projecting portions 21 projecting upward in the mold release direction are provided on the bottom surface 20a. ing.

The protruding portion 21 is a member for sandwiching the resin wire 7, and is provided as a set of three for one resin wire 7. The protruding portion 21 is a metal member, and is fixed to and integrated with the bottom surface 20 a of the lower mold 20.
In the present embodiment, there are a resin wire 7 extending in the left-right direction and a resin wire 7 extending in the front-rear direction. In the description of the configuration of the protruding portion 21, the resin wire 7 extending in the left-right direction is used. The three protrusions 21 to be sandwiched will be described as an example.

As shown in FIG. 7, the three protruding portions 21 constituting one set include a left protruding portion 21 a that protrudes corresponding to each of the left portion, the center portion, and the right portion of the resin wire 7, and the central protruding portion 21 b And the right protruding portion 21c.
Moreover, as shown to Fig.8 (a)-(c), the left protrusion part 21a and the right protrusion part 21c are formed in the same shape. On the other hand, the central protruding portion 21b is formed symmetrically with respect to the left protruding portion 21a and the right protruding portion 21c with a line extending vertically as a center line.

As shown to Fig.8 (a), the concave surface 22 by which the resin wire 7 is arrange | positioned by notching in the side view substantially concave shape is formed in the front side surface of the left protrusion part 21a. The lower surface 23 of the concave surface 22 is a horizontal surface and constitutes a mounting surface on which the resin wire 7 is mounted.
Further, the upper surface 24 of the concave surface 22 is an inclined surface that extends upward from the rear of the resin wire 7, and constitutes a contact surface with which the rear upper side of the resin wire 7 placed on the lower surface 23 contacts.
From the above, the left protruding portion 21 a holds the lower side and the rear upper side of the left portion of the resin wire 7 by the lower surface 23 and the upper surface 24.
Therefore, as shown in FIG. 7, even if a force (see arrow I in FIG. 7) that causes the left portion of the resin wire 7 to move backward due to foaming of the foam material is received, the left portion of the resin wire 7 Is restricted from moving backwards.

Further, as shown in FIG. 8C, the right protruding portion 21c formed in the same shape as the left protruding portion 21a holds the lower side and the upper upper side of the rear portion of the resin wire 7 by the lower surface 23 and the upper surface 24. doing.
Therefore, as shown in FIG. 7, even if a force (see arrow M in FIG. 7) that causes the right portion of the resin wire 7 to move backward due to foaming of the foam material is received, the right portion of the resin wire 7 Is restricted from moving backwards.

On the other hand, as shown in FIG. 8 (b), on the rear side surface of the central projecting portion 21 b formed symmetrically, a horizontal lower surface 23 and an upper surface 24, which is a slope that faces upward from the front of the resin wire 7. And a concave surface 22 is formed.
Therefore, the central protruding portion 21 b holds the lower side and the upper front side of the central portion of the resin wire 7 by the lower surface 23 and the upper surface 24.
Therefore, as shown in FIG. 7, even if a force (see arrow L in FIG. 7) that causes the central portion of the resin wire 7 to move forward due to foaming of the foam material is received, the central portion of the resin wire 7. Is restricted from moving forward.

Further, as shown in FIGS. 8A to 8B, the upper surfaces 24 of the left projecting portion 21 a and the right projecting portion 21 c are in contact with the rear upper side of the resin wire 7, and the upper surface 24 of the central projecting portion 21 b is the resin wire 7. The front part is in contact with the upper side.
For this reason, even if the resin wire 7 receives a force that moves upward, the resin wire 7 is sandwiched between the upper surfaces 24 of the left and right protruding portions 21a and 21c and the upper surface 24 of the central protruding portion 21b. Is restricted from moving upward.
In addition, the downward movement of the resin wire 7 is restricted by the lower surfaces 23 of the left protruding portion 21a, the central protruding portion 21b, and the right protruding portion 21c.

Further, in the set of three projecting portions 21, the central projecting portion 21b disposed at the center is disposed on the opposite side to the other left projecting portion 21a and right projecting portion 21c with the resin wire 7 interposed therebetween. The following effects can be obtained.
As shown in FIG. 7, there is a case where the left part of the resin wire 7 receives a force (see arrow J in FIG. 7) that moves to the front where the left protruding part 21a is not provided due to foaming of the foam material. .
Here, since the central protruding portion 21b holds the central portion of the resin wire 7 so as not to move forward, the left portion of the resin wire 7 has a force that moves backward due to the elastic force of the resin wire 7. (See arrow I in FIG. 7). For this reason, the left portion of the resin wire 7 is maintained in the left protruding portion 21a without moving forward.

Similarly, even if a force (see arrow K in FIG. 7) that causes the center portion of the resin wire 7 to move backward due to foaming of the foam material is received, both ends of the resin wire 7 are held. An elastic force (see arrow L in FIG. 7) that moves forward acts, and does not move backward.
Further, even when a force that causes the right portion of the resin wire 7 to move forward due to foaming of the foam material (see arrow N in FIG. 7) is received, an elastic force that moves backward (arrow M in FIG. 7). ) Is working, so that it does not move forward.
As described above, the entire set of the protruding portions 21 restricts the entire resin wire 7 from moving in the upward, backward, downward, and forward directions, that is, not to move in the radial direction of the resin wire 7. .

In addition, the three projecting portions 21 constituting one set are fixed to the lower mold 20 so as to correspond to the C-ring 5 d provided on the skin 5. For this reason, on the upper surface of the foamed body 6 formed by the mold, a recess 8 is formed which is a trace of the protruding portion 21 and opens corresponding to the C ring 5d provided on the skin 5 (FIG. 3 (b) to (d)).
Further, as shown in FIGS. 8A to 8C, the length in the front-rear direction on the base 25 side of the protruding portion 21 (the portion below the lower surface 23 of the concave surface 22) is larger than the diameter of the resin wire 7. It is getting bigger. For this reason, an opening 9 having an opening larger than the diameter of the resin wire 7 is formed in the recess 8 of the foam 6 (see FIGS. 3B to 3D). In addition, the groove part 10 of the recessed part 8 is formed by the site | part arrange | positioned above the base part 25 in the protrusion part 21 (refer FIG.3 (b)-(d)).

  In the next foam material introduction step, a stock solution of foam material is introduced into the lower mold 20, and the lower mold 20 is closed with an upper mold (not shown). The amount of the foam material stock solution is about one fifth of the volume occupied by the cavity.

In the next foaming step, the internal foam material is heated by heating the mold to foam the foam material. According to this, the foam 6 having the same shape as the cavity is formed by expanding and curing the stock solution of the foam material.
Since the resin wire 7 is regulated so as not to move in the radial direction of the resin wire 7 as described above, even if the resin wire 7 receives a force due to the expansion of the stock solution of the foam material, the foam 6 is not displaced. Insert molding.

In the next mold drawing step, the upper mold (not shown) is removed from the lower mold 20 to open the upper side of the lower mold 20, and the foam 6 is extracted from the lower mold 20 upward.
Here, the resin wire 7 is pulled upward by the extraction of the foam 6, and the upper surface 24 of the protrusion 21 presses the resin wire 7, so that the foam 6 in the vicinity where the resin wire 7 is embedded is recessed. Then, the resin wire 7 moves upward along the upper surface 24 that is the slope of the protruding portion 21 and is detached from the three protruding portions 21.
From the above, the vehicle seat pad 4 insert-molded in the foam 6 without the resin wire 7 being displaced is manufactured.
Further, on the upper surface of the foam 6 of the vehicle seat pad 4 manufactured by the above-described manufacturing method, a recess 8 that is a trace of the plurality of protrusions 21 and opens toward the resin wire 7 is formed.

  As described above, according to the method for manufacturing the vehicle seat pad 4 according to the embodiment, the resin wire 7 is held by the plurality of protrusions 21 provided on the lower mold 20, and the positional deviation of the resin wire 7 in the radial direction is prevented. Has been. For this reason, the vehicle seat pad 4 in which the resin wire 7 is insert-molded at a predetermined position can be manufactured.

  And according to the vehicle seat pad 4 which concerns on embodiment, the resin wire 7 is insert-molded by the foam 6 in the predetermined position, without position shift. Therefore, when the C-ring 5d is locked to the resin wire 7 and the skin 5 is attached to the vehicle seat pad 4, the stitch 5a extends linearly along the resin wire 7 and wrinkles are generated on the skin 5. It is supposed not to.

  Moreover, according to the manufacturing method of the vehicle seat pad 4 according to the embodiment, since the concave portion 8 is formed by the protruding portion 21, the step of cutting the surface of the foam 6 to form the concave portion 8 can be omitted. it can.

Although the embodiments have been described above, the present invention is not limited to the examples described in the embodiments.
The plurality of protrusions 21 of the embodiment are arranged so as to be shifted in the left-right direction in which the resin wire 7 extends and do not face each other in the front-rear direction (see FIGS. 6 and 7), but the present invention is limited to this. It is not something.
For example, as shown in FIG. 9, the plurality of protrusions 21 may be arranged opposite to each other before and after the resin wire 7. Even in the protruding portion according to this modification, it is possible to avoid displacement of the resin wire 7.
In addition, regarding arrangement | positioning of the protrusion part 21, as it demonstrated in embodiment, it is desirable to arrange | position by shifting in the left-right direction where the resin wire 7 extends (refer Fig.8 (a)-(c)).
According to the modification shown in FIG. 9, since the plurality of projecting portions 21 are arranged opposite to the front and rear of the resin wire 7, an elongated foam 6 a that is elongated in the vertical direction is formed between the projecting portions 21. And the elongate foam 6a formed between the protrusion parts 21 is pinched by the protrusion part 21 arrange | positioned facing at the time of the mold release of the foam 6, and there exists a possibility that it may be damaged.
On the other hand, according to the example shown by embodiment, since the elongate foam 6a pinched | interposed into the protrusion part 21 is not formed, there is no possibility that the foam 6 may be damaged.

  Further, in the embodiment, since the protruding portion 21 sandwiches one resin wire 7, the number of the protruding portions 21 is one set of three. However, in the present invention, one set of five protruding portions 21 or one set of four protruding portions 21 is used. It is good also as one set.

  Moreover, although the protrusion part 21 of embodiment clamps the resin wire 7 as a set of three, you may add a structure other than this. For example, providing the member which contact | abuts the both ends of the resin wire 7 in the lower mold | type 20 is mentioned. According to this, the positional deviation of the resin wire 7 in the axial direction can be regulated.

Moreover, in the protrusion part 21 of embodiment, although the resin wire 7 was pinched linearly without applying stress to the resin wire 7, this invention is not limited to this.
For example, as shown in FIG. 10, the center protrusion 21b may be disposed closer to the rear than the left protrusion 21a and the right protrusion 21c, and the resin wire 7 may be sandwiched in a state where the center is curved backward.
According to such a configuration, due to the elastic force of the resin wire 7, the corresponding left protruding portion 21 a, central protruding portion 21 b, and right protruding portion 21 c are respectively formed on the right portion, the central portion, and the left portion of the resin wire 7. A force toward the concave surface 22 (see arrow I) is generated. For this reason, it becomes difficult for the resin wire 7 to fall off from the concave surface 22 of the protruding portion 21, and the resin wire 7 can be clamped more firmly.

2 Seat cushion 4 Vehicle seat pad 5 Skin 5a Stitch 5d C-ring (locking part)
6 Foam 7 Resin wire 8 (8a, 8b, 8c) Recess 20 Lower mold 21 (21a, 21b, 21c) Projection 22 Concave surface 23 Bottom surface (mounting surface)
24 Upper surface (contact surface)

Claims (5)

A vehicle seat pad comprising a foam and a resin wire insert-molded inside the foam;
An epidermis covering the foam,
A locking portion provided on the skin, and locked to the resin wire;
A vehicle seat comprising:
The foam is provided with a plurality of recesses for locking the locking portion of the skin covering the foam to the resin wire,
The plurality of recesses are formed by traces of a plurality of protrusions protruding from the cavity surface of the mold and sandwiching the resin wire,
The recess is
A surface corresponding to a placement surface on which the resin wire is placed in the protruding portion;
A surface corresponding to a contact surface that is provided on the opposite side of the mounting surface across the resin wire in the projecting portion and contacts the upper portion of the resin wire;
With
The locking portion is a C-ring that surrounds the surface corresponding to the resin wire and the contact surface and is provided so as to pass through the surface corresponding to the recess and the mounting surface. . The plurality of recesses are provided at least three or more shifted in the axial direction of the resin wire,
Of the at least three or more recesses, two recesses are provided on one side of the resin wire, and one recess between the two recesses is provided on the other side of the resin wire. The vehicle seat according to claim 1. A vehicle seat pad comprising a foam and a resin wire insert-molded in the foam;
An epidermis covering the foam,
A locking portion provided on the skin, and locked to the resin wire;
With
The foam is a method for manufacturing a vehicle seat in which a recess in which the locking portion of the skin that locks to the resin wire is accommodated is formed,
A mold preparing step of preparing a mold by sandwiching the resin wire between a plurality of projecting portions projecting from the cavity surface;
After the mold preparation step, a foam material introduction step for introducing a foam material into the mold,
After the foam material introduction step, a foaming step of heating and foaming the foam material;
After the foaming step, a die cutting step for extracting the foam from the mold,
Covering the foam with the skin and locking the locking portion to the resin wire;
Have
The protrusion is
A mounting surface on which the resin wire is mounted;
A contact surface that is provided on the opposite side of the mounting surface across the resin wire, and that contacts the top of the resin wire;
With
The abutment surface of the protruding portion regulates the upward movement of the resin wire during the foaming step in cooperation with the abutting surface of the protruding portion disposed on the opposite side across the resin wire,
In the die cutting step, the plurality of recesses are formed in the foam by the traces of the plurality of protrusions,
In the step of covering the foam with the skin and locking the locking portion to the resin wire, the locking portion that is a C ring surrounds the surface corresponding to the resin wire and the contact surface and A method for manufacturing a vehicle seat, wherein the vehicle seat is provided so as to pass through a surface corresponding to the recess and the mounting surface. The mold is provided with at least three or more protrusions for one resin wire,
The at least three or more protrusions are arranged shifted in the axial direction of the resin wire,
Of the at least three or more protrusions, two protrusions are provided on one side of the resin wire, and one protrusion between the two protrusions is provided on the other side of the resin wire. The method for manufacturing a vehicle seat according to claim 3, wherein: The said contact surface is a slope which inclines upward as it sees the said resin wire from an axial direction and goes to the center part of the said resin wire from the side of the said resin wire. 5. A method for manufacturing a vehicle seat according to 4.

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