JP2016007923A - Vehicle seat pad - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat pad in which a high fastening force is generated between a bracket and a wire.SOLUTION: A vehicle seat pad 4 according to the invention includes: a resin foam 6 foam-molded by a molding tool; and a wire 11 and a bracket 10 insert-molded in the resin foam 6. A hole part 13 for storing an end part 11a of the wire 11 is formed in the bracket 10. The hole part 13 is formed so as to have a diameter larger than the end part 11a of the wire 11. Protrusions 14, 15 are formed in at least one of the hole part 13 and the end part 11a of the wire 11.

Description

  The present invention relates to a vehicle seat pad.

  In vehicle seat cushions and seat backs, a resin foam that can be deformed by receiving a load from an occupant is used as a member constituting a vehicle seat pad. Such a resin foam is generally foam-molded with a mold.

  Moreover, in the following patent document, in order to lock the locking member provided in the skin, or in order to partially increase the elasticity of the resin foam, a wire is embedded in the resin foam.

JP 2008-194957 A JP 08-206376

By the way, when the wire is insert-molded into the resin foam, a bracket for supporting the wire is used in order to prevent displacement of the wire. Some of these brackets are insert-molded together with wires to connect a plurality of wires within a resin foam.
And about the bracket insert-molded to a resin foam, there existed a request | requirement of increasing the adhesive force with a wire conventionally.

  Therefore, the present invention is an invention created in view of the above-described background, and an object thereof is to provide a vehicle seat pad having a high fixing force between a bracket and a wire.

  As means for solving the problems, a vehicle seat pad according to the present invention includes a resin foam foam-molded with a mold, and a wire and a bracket insert-molded in the resin foam, The bracket is formed with a hole for accommodating the end of the wire, and the hole is formed to have a larger diameter than the end of the wire, and is formed in at least one of the hole and the end of the wire. Is characterized in that a protrusion is formed.

According to the above-described invention, the foam material flows into the hole formed with a larger diameter than the end of the wire during foam molding. And the edge part of a wire adheres in the hole part of a bracket with the resin foam which flowed into the hole part of the bracket and was hardened | cured. Hereinafter, the resin foam cured in the hole may be referred to as a fixing resin foam.
Further, the protrusions exert an anchor effect on the fixing resin foam, and the fixing force between the member (bracket or wire) provided with the protrusions and the fixing resin foam is improved.
From the above, the fixing force between the bracket and the wire is high, and the bracket and the wire are difficult to separate. According to the above-described invention, the work for fixing the bracket and the wire is only to house the end portion of the wire in the hole of the bracket at the time of foam molding, rather than the work such as application of adhesive or press-fitting. The bracket and the wire can be fixed (fixed) with less effort.

  Moreover, it is preferable that the protrusion has a spiral shape.

  According to the configuration described above, during foam molding, the foam material is guided by the spiral protrusion and enters the bottom of the hole, and air is discharged from the hole. As a result, the occurrence of air accumulation is suppressed, and a lacking portion is less likely to occur in the fixing resin foam, and the fixing force between the bracket and the wire is improved.

  In addition, a first protrusion that is the spiral protrusion is formed at the end of the wire, and a second protrusion that is the spiral protrusion is formed in the hole of the bracket, and the first protrusion It is preferable that the outer diameter of the second protrusion is smaller than the inner diameter of the second protrusion, and the first protrusion and the second protrusion are different in at least one of the spiral pitch and the spiral direction.

According to the configuration described above, each protrusion (first protrusion, second protrusion) formed on the bracket and the wire exhibits an anchor effect, and the fixing force between the bracket and the wire is remarkably improved.
In addition, since the outer diameter of the first protrusion is smaller than the inner diameter of the second protrusion, the wire can be accommodated in the hole of the bracket simply by inserting the end portion of the wire, and workability is improved.

  In addition, it is preferable that at least one of the spiral pitch and the spiral direction is different between the first protrusion and the second protrusion.

  According to the above-described configuration, the first protrusion and the second protrusion have different spiral pitches or spiral directions, so that it is difficult for the other thread to enter between one thread. For this reason, the first protrusion and the second protrusion are not easily caught when the wire is inserted, and the end of the wire can be smoothly inserted to the bottom of the hole.

  It is preferable that at least one of the wire and the bracket is formed of resin.

  According to the configuration described above, since the same material (resin) as the resin foam is formed, the fixing force with the fixing resin foam is improved, and the fixing force between the bracket and the wire is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle seat pad with the high adhering force of a bracket and a wire 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 sectional drawing which cut the bracket to which a resin wire adheres along the resin wire. It is a perspective view of the state which extracted and separated the resin wire and the bracket. It is sectional drawing of a shaping | molding die. It is sectional drawing which shows the state by which the edge part of the resin wire was inserted in the hole part of a bracket.

  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 3a.

  As shown in FIG. 1, a vehicle seat 1 according to the embodiment is a rear seat installed on the rear side of a passenger compartment, and includes a seat cushion 2 that constitutes a seating surface and a seat back 3 a that supports a torso of an occupant. And a headrest 3b that supports the head of the occupant.

  The seat cushion 2 has a rectangular shape in a plan view, and includes a vehicle seat pad 4 having a larger left-right width than a front-rear width, and a skin 5 that covers and decorates the vehicle seat pad 4.

  The vehicle seat pad 4 is embedded in the resin foam 6 formed by foaming a foam material (urethane raw material) with a molding die 20 (see FIG. 4) and molded into a predetermined shape, and insert molding. Embedded member 7.

  As shown in FIG. 1, the embedded member 7 includes a plurality of resin wires 11, a plurality of brackets 10 embedded in four corners of the resin foam 6 to connect the resin wires 11, and a front end side of the resin foam 6. And a fixture 8 embedded in the rear end side.

The resin wire 11 is a linear member having a substantially circular cross-sectional view, and is embedded in the resin foam 6 to increase the elasticity of the resin foam 6 or to lock the locking member of the skin 5. It is a member.
In FIG. 1, among the plurality of resin wires 11, the resin foam 6 extends along the front end side, the rear end side, the left end side, and the right end side to increase the elastic force of the end portion of the resin foam 6. Only the resin wire 11 is shown, and the resin wire extending along the stitch 5a of the skin 5 is not shown.

The bracket 10 is temporarily fixed to the mold 20 during foam molding (see FIG. 4) and supports the end 11a of the resin wire 11 so as not to be displaced (see FIG. 5). This is a member for connecting the supported resin wires 11 together.
As shown in FIG. 2, the bracket 10 is a bead-type expanded polypropylene (expanded polypropylene) formed in a substantially cubic shape. Therefore, even if roller crushing is performed in order to make the bubbles in the resin foam 6 communicate with each other, the bracket 10 is hardly damaged.
The bracket 10 has a pair of protrusions 12 and 12 that protrude outward from the upper side of the outer wall surface and fit into the recess 25a (see FIG. 5) of the mold 20 and a plurality of recesses that are recessed inward from the outer wall surface. A hole 13 is formed.

The hole 13 is a part in which the end 11a of the resin wire 11 is accommodated during foam molding (see FIG. 5).
As shown in FIGS. 2 and 3, the hole 13 has a truncated cone shape whose diameter increases from the bottom toward the opening.
Further, the end portion 11a of the resin wire 11 accommodated at the time of foam molding is accommodated in the hole portion 13 as it is.
The relationship between the hole 13 of the bracket 10 and the end 11a of the resin wire 11 will be described later.

Although not particularly shown, the fixture 8 is a member that is formed in a substantially C shape in a side view and can sandwich the resin wire 11, and is temporarily fixed by a fixing member (not shown) of the molding die 20 during foam molding.
Then, as shown in FIG. 1, the fixture 8 temporarily fixed to the mold 20 is insert-molded with the relatively long resin wire 11 sandwiched between the front end side and the rear end side. The resin foam 6 is integrated.
According to this fixing tool 8, the positional deviation of the central portion of the resin wire 11 is suppressed, the fixing force between the central portion of the resin wire 11 and the resin foam 6 is improved, and the resin foam 6 is seated by the occupant's seating. Is deformed, the center portion of the resin wire 11 also follows and easily deforms.

The skin 5 is a bag-like member formed by sewing the end portions of a plurality of cover pieces.
Although not shown, the skin 5 is sewn in a state in which the end of the cover piece to be stitched is folded to the back side of the skin 5, the end of the cover piece is hidden on the back side of the skin 5, and the surface of the skin 5 A stitch 5a (see FIG. 1) appears on the side.
Further, a C-ring that is engaged with the resin wire 11 is provided at the end of the cover piece of the skin 5. For this reason, it is difficult for the skin 5 to be displaced with respect to the resin foam 6, and the stitch 5 a extends along the resin wire 11 so that wrinkles are not easily generated in the skin 5.

  Next, details of the end 11a of the resin wire 11 and the hole 13 of the bracket 10 will be described.

  As shown in FIG. 2, the inner diameter of the hole 13 is formed larger than the outer diameter of the resin wire 11. For this reason, at the time of foam molding, when the end portion 11 a of the resin wire 11 is accommodated in the hole portion 13, the resin wire 11 is loosely fitted between the inner peripheral surface of the hole portion 13 and the outer peripheral surface of the resin wire 11. A gap S is formed in the gap (see FIG. 5).

Between the hole 13 of the bracket 10 and the end 11a of the resin wire 11 (gap S), the fixing resin foam 6a exists. The fixing resin foam 6a is obtained by curing the foam material flowing into the gap S during foam molding.
The resin foam 6 is attached to the inner peripheral surface of the hole 13 and the outer peripheral surface of the resin wire 11 when uncured, and the end portion 11a of the resin wire 11 is attached to the hole of the bracket 10 by curing. It is fixed to the part 13.

As shown in FIGS. 2 and 3, the outer peripheral surface of the resin wire 11 is formed with a spiral protrusion (hereinafter referred to as a first protrusion) 14 protruding outward in the radial direction, and the inner peripheral surface of the hole 13. A spiral protrusion (hereinafter referred to as a “second protrusion”) 15 that protrudes radially inward is formed.
For this reason, during foam molding, the foam material that has flowed into the gap S enters between the spiral first protrusions 14 and between the second protrusions 15 and is cured.
As a result, the first protrusion 14 and the second protrusion 15 are caught by the fixing resin foam 6a, and an anchor effect is exerted on the fixing resin foam 6a.

  Further, the outer diameter L1 of the first protrusion 14 is smaller than the minimum inner diameter (the inner diameter on the bottom surface side) L2 of the second protrusion 15. For this reason, it can accommodate in the hole part 13 only by inserting the edge part 11a of the resin wire 11. FIG.

The spiral pitch L3 of the first protrusion 14 is smaller than the spiral pitch L4 of the second protrusion 15, and the spiral pitch of the first protrusion 14 and the second protrusion 15 is different.
Further, the first protrusion 14 is formed counterclockwise from the center (left side) toward the tip (right side), and the second protrusion 15 is formed clockwise from the opening (left side) toward the bottom (right side). Thus, the spiral directions of the first protrusion 14 and the second protrusion 15 are different.
From the above, the first protrusion 14 and the second protrusion 15 have different spiral pitches and spiral directions, and the other thread does not enter between one thread. For this reason, when inserting the edge part 11a of the resin wire 11 in the hole part 13, the 1st protrusion 14 and the 2nd protrusion 15 cannot catch easily.

Next, the mold 20 used in the method for manufacturing the vehicle seat pad 4 will be described.
As shown in FIG. 4, the molding die 20 of the present embodiment includes a lower die 21 that opens upward, and an upper die 22 that can be opened and closed with respect to the lower die 21. On the other hand, the upper side of the resin foam 6 is molded.
A cavity surface 22a that forms the upper surface of the resin foam 6 is formed on the upper mold 22, and a temporary fixing portion 23 to which the bracket 10 is temporarily fixed is provided at a predetermined position of the cavity surface 22a.

As shown in FIG. 5, the temporary fixing portion 23 is a metal plate formed in a C shape in a sectional view, and extends from both ends of the flat bottom plate portion 24 fixed to the cavity surface 22 a and the bottom plate portion 24. A pair of sandwiching portions 25 that sandwich the bracket 10.
Further, a concave portion 25 a is formed on the base side of the holding portion 25 so as to be recessed from the center of the bracket 10 and into which the protruding portion 12 of the bracket 10 is fitted.

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 molding die preparation step, a foam material introduction step, a foaming step, and a die cutting step.

  In the molding die preparation step, a release material is sprayed on the molding die 20 and the embedded member 7 is disposed on the molding die 20.

  As for the arrangement of the embedded member 7, first, the bracket 10 is held between the holding portions 25, 25 of the temporary fixing portion 23, and the protruding portion 12 of the bracket 10 is fitted into the concave portion 25 a of the temporary fixing portion 23.

Next, the end 11 a of the resin wire 11 is inserted into the hole 13 in order to accommodate the end 11 a of the resin wire 11 in the hole 13 of the bracket 10.
Here, the diameter of the opening of the hole 13 is increased, and the resin wire 11 can be easily inserted. Moreover, since the 1st protrusion 14 and the 2nd protrusion 15 cannot catch easily, the edge part 11a of the resin wire 11 can be smoothly moved from the opening part of the hole part 13 to the bottom part.

  In the foam material introducing step, the stock solution of the foam material is introduced into the lower mold 21 and the upper mold 22 is clamped to the lower mold 21. The amount of the foam material stock solution is about one fifth of the volume occupied by the cavity.

In the foaming step, the mold 20 is heated in order to foam and cure the stock solution of the foam material. Then, the unfoamed foam material pressed by the foaming foam material flows into the gap S between the hole 13 and the resin wire 11 by heating the mold 20, and air is discharged from the gap S.
Here, even if the unfoamed foam material does not enter the bottom side of the hole portion 13 and the air on the bottom side is not discharged, the foam material that expands in the gap S is a spiral second protrusion. 15. It is guided by the first protrusion 14 to enter the bottom side of the hole 13, and the air on the bottom side is discharged.

Moreover, since the opening part of the hole part 13 is diameter-expanded and many foam materials are easy to flow in, the air of the hole part 13 is easy to be discharged | emitted.
In addition, in the above process, the bracket 10 receives a load due to foaming of the foam material, but since the pair of protrusions 12 and 12 are fitted in the recesses 25a and 25a, the bracket 10 and the bracket 10 are supported. The resin wire 11 is not easily displaced.

  Then, the foam material foamed in the gap S is cured to produce the fixing resin foam 6a, and the bracket 10 and the resin wire 11 are fixed.

  In the next die-cutting step, the upper die 22 is removed from the lower die 21, the upper portion of the lower die 21 is opened, the resin foam 6 is drawn upward from the lower die 21, and the resin wire 11 and the bracket 10 are embedded. A foam 6 is produced.

As described above, according to the vehicle seat pad 4 according to the embodiment, the protrusions (the second protrusions 15 and the first protrusions 14) exert an anchor effect on the fixing resin foam 6a, and the bracket 10 and the resin wire 11 The adhesive strength is high and difficult to separate.
Further, according to the vehicle seat pad 4 according to the embodiment, the air on the bottom side of the hole portion 13 is discharged and the air pool is hardly generated, and the fixing force between the bracket 10 and the resin wire 11 is improved.
Furthermore, according to the vehicle seat pad 4 according to the embodiment, the two protrusions of the first protrusion 14 and the second protrusion 15 are formed, and the fixing force between the bracket 10 and the resin wire 11 is remarkably improved. .

  Further, according to the vehicle seat pad 4 according to the embodiment, the end portion 11a of the resin wire 11 can be accommodated in the hole portion 13 of the bracket 10 simply by inserting the resin wire 11, and workability is improved. improves.

  Further, according to the vehicle seat pad 4 according to the embodiment, when the resin wire 11 is inserted, the first protrusion 14 and the second protrusion 15 face each other, but the spiral pitch and the spiral direction are different and are not easily caught. Therefore, the end 11 a of the resin wire 11 can be smoothly inserted to the bottom of the hole 13.

  According to the vehicle seat pad 4 according to the embodiment, the work for fixing the bracket 10 and the resin wire 11 is performed by inserting the end portion 11a of the resin wire 11 into the hole portion 13 of the bracket 10 during foam molding. However, the bracket 10 and the resin wire 11 can be fixed with less labor than operations such as application of adhesive or press-fitting.

  Moreover, according to the vehicle seat pad 4 according to the embodiment, the bracket 10 and the resin wire 11 are formed of the same material (resin) as the fixing resin foam 6a, and the fixing force to the fixing resin foam 6a is obtained. Is improved, and the fixing force between the bracket 10 and the resin wire 11 is high.

As mentioned above, although the vehicle seat pad 4 which concerns on this embodiment was demonstrated, this invention is not limited to this. For example, the protrusions (first protrusion 14 and second protrusion 15) of the embodiment are spiral protrusions, but the present invention may be a cylindrical protrusion or an annular protrusion, and is not particularly limited.
Moreover, although the hole 13 of the embodiment has a truncated cone shape, the present invention may have a columnar shape.

  Further, in the present embodiment, the protrusions (first protrusion 14 and second protrusion 15) are provided on both the bracket 10 and the resin wire 11, but in the present invention, one of the bracket 10 and the resin wire 11 is provided. There may be.

Moreover, although the 1st protrusion 14 and the 2nd protrusion 15 of this embodiment differ in both a helical pitch and a helical direction, this invention is not limited to this. For example, the first protrusions 14 and the second protrusions 15 may have different spiral pitches or spiral directions, and even with such a configuration, an effect equivalent to that of the embodiment can be obtained.
The bracket 10 is not only a beaded foamed polypropylene molded into a substantially cubic shape, but also a thermoplastic resin such as a polyamide resin, a polyacetal resin, a polypropylene resin, a polystyrene resin, an ABS resin, or a polycarbonate in addition to a beaded foamed polystyrene resin. Or a thermoplastic elastomer resin can be used.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat cushion 4 Vehicle seat pad 6 Resin foam 6a Adhesive resin foam 7 Embedded member 10 Bracket 11 Resin wire 13 Hole 14 First protrusion (protrusion)
15 Second protrusion (protrusion)
20 Mold

Claims (5)

A resin foam foam-molded with a mold, and a wire and a bracket insert-molded in the resin foam,
The bracket is formed with a hole for accommodating the end of the wire,
The hole is formed with a larger diameter than the end of the wire,
A vehicle seat pad, wherein a projection is formed on at least one of the hole and the end of the wire.   The vehicle seat pad according to claim 1, wherein the protrusion has a spiral shape. At the end of the wire, a first protrusion that is the spiral protrusion is formed,
A second protrusion which is the spiral protrusion is formed in the hole of the bracket,
The vehicle seat pad according to claim 2, wherein an outer diameter of the first protrusion is smaller than an inner diameter of the second protrusion.   The vehicle seat pad according to claim 3, wherein at least one of a spiral pitch and a spiral direction is different between the first protrusion and the second protrusion.   The vehicle seat pad according to any one of claims 1 to 4, wherein at least one of the bracket and the wire is formed of a resin.

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