JP2017171053A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat having a fitting structure capable of simply post-fitting without inserting a wire used for the hanging-in lock of a surface-covering trim cover to a foam particle molding of thermoplastic resin used as a seat pad material of the vehicle seat, and capable of keeping recyclability because of low cost and easy degradability.SOLUTION: In an objective vehicle seat, a seat pad 20 is formed by a thermoplastic resin foam molding, and a holding part 23 for holding a wire material W locking a trim cover 50 is formed at the rear side of the above foam molding. The wire material is exposed and retained to the rear side of the foam molding by the holding part. In the foam molding, a through-hole 24 communicating in a thickness direction is formed toward the wire material retained by the holding part, and the trim cover is hung in and locked to the wire material via the through-hole from the right face side of the foam molding.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a vehicle seat, and relates to a vehicle seat in which a trim cover is suspended and attached to a seat pad.

  The seat surface and the backrest portion of the vehicle seat are formed by covering the front surface of the seat pad with a trim cover. When covering the trim cover on the seat pad, the trim cover is stored in order to store the sewing part of the trim cover, prevent the trim cover from being lifted and displaced, and adhere to the outer shape of the seat pad to provide a good appearance. Is so-called suspended and attached to the seat pad.

  For example, in the suspension lock, a wire material is fixed inside the seat pad that supports the trim cover, and an elongated suspension hole is formed from the wire material toward the front surface side of the seat pad. The wire material fixed behind the suspension hole and the suspension portion of the trim cover are connected by a C-shaped hog ring, and the trim cover is pulled into the suspension hole of the seat pad and fixed. .

Here, conventionally, a wire material used for suspending the trim cover has been adopted in which a flexible polyurethane foam, which is a seat pad material, is previously inserted and integrally molded. In such a case, the wire material attached to the back surface of the trim cover, the trim rubber, the pulling cloth, or the like is fixed to the wire material integrally formed with the seat pad by being pulled in and locked by means such as a hog ring.
Further, in Patent Document 1, unlike the method described above, a loop portion that functions as a wire used for fixing by hog ring is formed in a part of a support spring that supports a seat pad, and the wire material is made of polyurethane foam. A technique that is not inserted into a seat pad is disclosed.

  In recent years, for the purpose of weight reduction and the like, a vehicle seat having a configuration in which a thermoplastic resin foam particle molded body is used as a seat pad or a raising material has been proposed.

JP 2010-263933 A

  However, like a conventional flexible polyurethane foam vehicle seat, if the wire material for suspending is inserted into the thermoplastic resin foam molded body and integrally molded, the enclosed wire material cannot be easily removed. Therefore, there is a possibility that the recycling work becomes difficult. Also, if a metal wire material with little dimensional change due to molding is inserted and integrated into a thermoplastic resin foam that cools and shrinks immediately after molding, the thermoplastic resin foam and metal As a result, the wire materials are in a state of resisting each other, and as a result, the entire foamed particle molded body may be easily warped or strained. Moreover, it is difficult to easily remove the wire material from the foam molded body in which the wire material is inserted and integrated, and the problem remains from the viewpoint of recycling.

  In the vehicle seat in the form of using the thermoplastic resin foam molded body as a seat pad, the present invention allows the trim cover to be suspended and locked to the thermoplastic resin foam molded body with ease and good workability. The object is to create a vehicle seat that is highly recyclable.

In order to achieve the above object, the present invention provides a vehicle seat described in the following [1] to [8].
[1] A vehicle seat including a seat pad and a trim cover that covers a front surface side of the seat pad, wherein the seat pad is formed of a thermoplastic resin foam molded body, A holding part for holding the wire material for locking the trim cover is formed on the back side of the wire material, and the wire material is exposed and held on the back side of the thermoplastic resin foam molded body by the holding part, In the foamed molded body, a through hole communicating in the thickness direction is formed toward the wire material held by the holding portion, and the foamed molded body is inserted through the through hole from the front surface side. The trim cover is suspended and locked to the wire member.
[2] The thermoplastic resin foam molded body is a foamed particle molded body made of a resin selected from a polyethylene resin, a polypropylene resin, and a composite resin of a styrene resin and an olefin resin. The vehicle seat according to [1] above.
[3] The trim cover according to [1] or [2], wherein the trim cover is suspended and locked to a wire material held on the back side of the thermoplastic resin foam molded body by hog ring. Vehicle seats.
[4] The vehicle according to any one of [1] to [3] above, wherein the compression stress at 25% deformation of the thermoplastic resin foam molded article is 0.06 to 0.7 MPa. Sheet.
[5] The vehicular seat according to any one of [1] to [4], wherein the thermoplastic resin foam molded article has a compression set of 20% or less.
[6] A protrusion is formed on the back surface side of the thermoplastic resin foam molded body, and a slit portion having a width smaller than the diameter of the wire material is formed on the protrusion, and the wire material is sandwiched between the slit portions. The vehicle seat according to any one of the above [1] to [5], wherein the wire material is held by the thermoplastic resin foam molding.
[7] A concave groove capable of accommodating a wire material is formed on the back side of the thermoplastic resin foam molded body, and a slit portion having a width smaller than the diameter of the wire material is formed in a part of the concave groove. Any one of the above [1] to [5], wherein the wire material is held in the concave groove of the thermoplastic resin foam molded body by sandwiching the wire material in the slit portion. The vehicle seat described in 1.
[8] The seat pad includes the thermoplastic resin foam molded body and a soft urethane foam molded body, and the thermoplastic resin foam molded body is formed of a foamed particle molded body, and the front surface of the foam molded body. The soft urethane foam molded body is laminated on the side, and the soft urethane foam molded body has a communication hole communicating with the through hole of the foam molded body, and the trim cover is formed from the front surface side. The trim cover is suspended and locked to the seat pad by being connected to the wire material held on the back surface side of the seat pad by hog ring through the communication hole and the through hole. The vehicle seat according to any one of [1] to [7].

  According to the above-described vehicle seat according to the present invention, the thermoplastic resin foam molded body is formed with a through hole communicating in the thickness direction, and the trim cover is hung on the back surface side of the thermoplastic resin foam molded body. A holding part for the wire material for lock-in locking is formed, and the wire is held here. Further, the trim cover is suspended and locked to the wire material through a through hole from the front surface side of the foamed particle molded body. With the above configuration, it is not necessary to insert a wire material as in the conventional structure, and it is simple and easy to work with, and the trim cover can be suspended and locked on the seat pad. Furthermore, it is possible to provide a vehicle seat that can be easily separated after use and has excellent recyclability.

It is the perspective view which showed an example of the vehicle seat. It is the conceptual perspective view which showed one Embodiment of the holding | maintenance part of the wire formed in the back surface side of the seat pad which consists of a thermoplastic resin expanded particle molded object. It is sectional drawing which expanded and showed a part of part along the AA of FIG. It is sectional drawing which showed the modification of the part in alignment with the AA of FIG. It is the conceptual perspective view which showed other embodiment of the holding | maintenance part of the wire formed in the back surface side of the seat pad which consists of a thermoplastic resin expanded particle molded object. It is sectional drawing which expanded and showed a part of part along the BB line of FIG. It is the conceptual perspective view which showed further another embodiment of the holding | maintenance part of the wire formed in the back surface side of the seat pad which consists of a thermoplastic resin expanded particle molded object. It is sectional drawing which expanded and showed a part of part along CC line of FIG. It is sectional drawing of the part corresponded to the part in alignment with the DD line of FIG. 5, which showed an example of the suspension locking structure of the trim cover at the time of employ | adopting embodiment of the wire holding part of FIG.

  Hereinafter, embodiments of a vehicle seat according to the present invention will be described in detail.

  As an example of the vehicle seat 1, as shown in FIG. 1, a seat cushion 2 serving as a seating portion for an occupant and a seat back 3 serving as a backrest are provided. A headrest 4 that supports the head of the occupant is provided on the upper portion of the seat back 3. The seat cushion 2 and the seat back 3 are formed by covering the front surface of the seat pad with a trim cover. The seat pad generally includes a frame for maintaining strength. When the trim cover is covered on the seat pad, so-called suspension locking is provided to stretch the trim cover along the outer surface shape of the seat pad, and the trim cover is suspended from the wire material. Thus, the trim cover is locked to the seat pad. Here, in the thermoplastic resin foam molded body constituting the seat pad, the side where the trim cover is covered and in contact with the human body is the front side, and the side opposite to the front side is the back side. In addition, the structure of this invention should just be employ | adopted as at least one part of the said vehicle seat 1. FIG.

In the present invention, at least a thermoplastic resin foam molded body is used as a material constituting the seat pad. In particular, it is preferable that the back surface side of the seat pad is formed of the foamed particle molded body because the engagement between the trim cover and the wire material becomes good. The thermoplastic resin is a material that can be recycled and can be reused as a resin material by heating the molded body.
Examples of the thermoplastic resin include general-purpose resins such as olefin resins such as polyethylene resins and polypropylene resins, styrene resins such as rubber-modified polystyrene and polystyrene, and composite resins of styrene resins and olefin resins. Among them, polyethylene resins, polypropylene resins, and composite resins of styrene resins and olefin resins (particularly, composite resins obtained by impregnating and polymerizing a styrene monomer in a polyolefin resin) are exemplified. Resin is preferable, and polypropylene resin is more preferable.

  Examples of the thermoplastic resin foam molded article include an extruded foam and a foamed particle molded article. Among these, it is preferable to use a foamed particle molded article that can be molded into a relatively free shape. . Among these, a polyolefin-based resin expanded particle molded body having a closed cell structure is more preferable.

  Conventionally, a flexible polyurethane foam (for example, a load-resistant flexible polyurethane foam shown in JIS K6401) having an open cell structure as a seat pad material has long been used for a vehicle seat. When flexible polyurethane foam is used as a seat pad material, a wire material is inserted into the flexible polyurethane foam, molded, and the periphery of the wire material is fixed by wrapping with the flexible polyurethane foam. For example, the trim cover was attached and fixed.

  When using the thermoplastic resin foam molded article as a sheet pad material, the present inventors pay attention to the fact that the thermoplastic resin foam molded article has sufficient rigidity to keep the wire in place as compared with the flexible polyurethane foam. In addition, the inventors have devised a structure that can fix the trim cover without insert molding the wire.

From the above viewpoint, the thermoplastic resin foam molded article used in the present invention preferably has a compressive stress of 0.06 to 0.7 MPa at 25% deformation, more preferably 0.1 to 0.6 MPa. And particularly preferably 0.1 to 0.3 MPa.
If the lower limit of the compressive stress at the time of deformation of 25% is 0.06 MPa or more, the wire can be easily inserted into the holding part, and the wire can easily be displaced during transportation or during the trim cover hanging work. It does not fall off and has excellent wire holding power. On the other hand, if the upper limit of the compressive stress at the time of deformation of 25% is 0.7 MPa or less, the width of the wire holding part is slightly smaller than the wire to form a slit part, and the wire is inserted and sandwiched in this slit part However, there is no need to push the wire with a greater force than necessary, and the wire insertion work is very easy.
The compressive stress at 25% deformation can be measured according to JIS K 7220-1 (2006).

Further, the compression set of the thermoplastic resin foam molded article is preferably 20% or less, more preferably 15% or less, and particularly preferably 12% or less.
If the compression set is 20% or less, the thermoplastic resin foam has elasticity and excellent resilience. Further, when the wire is inserted into the slit portion formed in the thermoplastic resin foam molded body, the thermoplastic resin foam molded body can be restored and the wire can be sufficiently retained. In addition to the wire, the wire can be easily inserted into the slit part without having to process the thermoplastic resin foam molding with very high precision, and it has excellent wire holding power. It becomes.
The compression set can be measured according to JIS K 6767 (1999).

Further, the apparent density of the expanded molded article is preferably ^{0.015g / cm 3 ~0.2g / cm 3} , more preferably ^{0.020g / cm 3 ~0.15g / cm 3} .
If it is in the said range, it has sufficient rigidity which hold | maintains a wire. Further, by using the foam molded body having the above apparent density, the seat pad can be further reduced in weight as compared with the conventionally used flexible urethane foam seat pad.
The apparent density is obtained by dividing the weight (g) of the foamed molded product by the volume (cm ³ ) of the foamed molded product obtained from the submerging method. In the submerging method, the foamed molded body is placed under an ambient temperature of 23 ° C. for 24 hours, and then the foamed molded body is submerged in water at 23 ° C. to measure the volume.

In the vehicle seat of the present invention, a wire holding portion is formed on the back side of the thermoplastic resin foam molded body, and the wire is exposed and held on the back side of the thermoplastic resin foam molded body by the holding portion. Yes. In the present invention, since the wire material for fixing the trim cover is not insert-molded and is attached in a subsequent process, the wire material is exposed and held from the back side of the foamed molded body. And the said trim cover is connected with the wire hold | maintained on the back surface side of the said seat pad through the through-hole connected from the front surface side to the back surface side of the said thermoplastic resin foaming molding. In addition, as said wire material (it may only describe as a wire), it is preferable to use metal or resin-made wires, such as rod shape, wire shape, and a tube, The diameter of the said wire material is 1-8 mm. It is preferable that it is 1.5 to 5 mm.
On the other hand, the conventional flexible urethane foam used for the seat pad has a 25% hardness of about 150 to 280 N in JIS K6401 (1997). It is difficult to fix the trim cover because it does not have sufficient rigidity to hold. In the present invention, since the thermoplastic resin foam molded article has sufficient rigidity to hold the wire, the wire is held on the back side of the thermoplastic resin foam molded article, and the thermoplastic resin foam molded article The present inventors have found that the trim cover can be fixed by connecting the trim cover and the wire through the through-hole and sandwiching the thermoplastic resin foam molded body.
In addition, since it is not necessary to match the fixing position of a trim cover with the position of a support spring like patent document 1 by setting it as the above structures, the position of a wire is comparatively matched with the design of a vehicle seat. It can be arranged freely.

  In the present invention, the thermoplastic resin foam molded body constituting the seat pad is formed with a through hole communicating in the thickness direction and a wire holding portion on the back surface side. Specifically, the through hole is opened in the thickness direction of the seat pad, and a fixing member such as a wire or a hook provided on the trim cover is drawn from the opening on the front surface side, and the thermoplastic resin The wire held on the back side of the foam is locked and connected by mechanical fixing means such as a hog ring or a hook. In order to connect the wire held in the foam molded body and the fixing member of the trim cover, the through hole is preferably formed at a position where the wire is held, and at least the back surface of the through hole It is preferable that a part of the side opening is formed so as to contact the wire.

  The holding part for holding the wire described above is provided on the back side of the thermoplastic resin foamed particle molded body constituting the seat pad. And the wire is being fixed by the holding | maintenance part provided in the back surface side of the foaming molding. At this time, since the wire is exposed and held on the back side of the foamed molded product, it can be easily removed during recycling.

  Specifically, the holding portion may be formed by providing a protrusion on a thermoplastic resin foam molded body, and providing the protrusion with a slit portion having a width smaller than the diameter of the wire, or foaming thermoplastic resin. You may comprise by providing the groove | channel which accommodates a wire in a molded object, and forming the slit part narrower than the diameter dimension of a wire in the appropriate place of this groove. In addition, the concave groove portion does not necessarily have a linear shape, and may have a bent shape or a curved shape according to the shape of the processed wire or trim cover.

The holding portion may be formed in a mold when the thermoplastic resin foam molded body is molded, or may be formed by machining or the like after molding the foamed particle molded body.
Further, the wire is held between the side walls of the slit portion formed in the holding portion, and is held and fixed by being held between the slit portions. At this time, when the wire is inserted into the slit portion and sandwiched, the foamed molded body is temporarily compressed and deformed. After the insertion, the foam molded body around the slit portion is restored to hold the wire. Thereafter, a fixing member such as a wire, trim rubber, or pulling cloth attached to the rear surface of the trim cover is drawn into and fixed to the wire installed on the rear surface side of the seat pad by means such as a hook or a hog ring. Since the trim cover fixing wire is pressed and locked to the trim cover side, the trim cover fixing wire is firmly fixed without falling off even when an external force or the like due to the seating of the occupant is applied.

  When the material of the thermoplastic resin foam molding to be used is a thermoplastic resin foam molding with high elasticity and excellent resilience as described above, temporarily insert the wire into the slit and sandwich it. Even if the width of the slit portion is increased due to the compression, it can be restored to the width before the insertion, and a sufficient fixing force to hold the wire in a predetermined position can be exhibited. In the stage before the trim cover is fixed, it is sufficient that the wire is held to such an extent that it is not easily moved or dropped during transportation or during the trim cover hanging work. The width of the slit is preferably set smaller than the diameter of the wire to be inserted, and is preferably about 40% of the diameter of the wire from a width 0.5 mm smaller than the diameter of the wire.

  On the other hand, in materials such as flexible polyurethane foam, it is the configuration of the present invention, and when the wire is inserted into the slit, even if the flexible polyurethane foam is immediately restored to the slit width before insertion, the wire rigidity is inferior because the material rigidity is inferior. It may be difficult to fix. From the viewpoint of the fixing force, a polyolefin resin is preferable among the thermoplastic resins. When polyolefin resin is used, the force required to pull out the wire once inserted is close to the force required to pinch the wire, and the wire can be easily removed during transportation and hanging work. Moving or dropping off is further suppressed.

Specifically, a slit part having a length of 90 mm, a width of 1 mm, and a depth of 1 mm is formed on the surface of the foamed molded body for each of the polyolefin resin foam, the polystyrene resin foam, and the rigid urethane foam. When a wire with a diameter of 2 mm was inserted and the force required for insertion and the force required for extraction were measured with a push-pull gauge, an insertion force of 22 N was obtained for a polypropylene resin foamed particle molded body (density 0.032 g / cm ³ ). a pullout force 18N, polystyrene type resin foamed bead molded article (density 0.020 g / cm ³⁾ in the insertion force 28N, a pullout force 13N, rigid polyurethane foam (density 0.042 g / cm ³⁾ the insertion force 37N The pulling force was 19N.
From the above results, the polypropylene resin expanded resin molded article has appropriate rigidity, resilience, and flexibility, so it is optimal for the formation of the slit portion, and the difference between the insertion force and the pulling force is small, and the mounting work is small. It can be seen that it is easy and excellent in workability and also excellent in physical properties after installation.

Further, as the foam molded article, in particular, polyolefin resin expanded particles molded article apparent density of 0.02g / cm ³ ~0.2g / cm ³ are preferred. In addition, since the foamed particle molded body made of polyolefin resin has an appropriate elasticity as long as the apparent density is within the above range, it has excellent wire locking properties. In addition, when the trim cover is suspended and locked to the wire by hog ring, etc., it has moderate rigidity compared to the soft urethane that has been used in the past, so the wire can be fixed without sinking into the foam molding The trim cover can be suspended and locked well. Furthermore, since the polyolefin-based resin expanded particle molded body has a closed cell structure and has an appropriate resilience, a force is locally applied to the suspended and locked portion, and the expanded particle molded body is caused by external force. Even if it is recessed, it is possible to form the original suspended latch by restoring the foamed particle molded body, and to prevent the trim cover from being loosened. Moreover, the holding | maintenance of the wire of a slit part also becomes favorable. In view of the above, the apparent density of the polyolefin resin expanded particles molded article is more preferably from 0.025~0.1g / cm ^3, further preferably 0.03~0.08g / cm ^3. Further, from the above viewpoint, the compression elastic modulus of the polyolefin resin foamed particle molded body is preferably 1 MPa or more and 20 MPa or less, more preferably 2 MPa or more and 15 MPa or less, and further preferably 3 MPa or more and 10 MPa or less. .
The compression modulus is obtained by cutting out a test piece having a length of 50 mm, a width of 50 mm, and a thickness of 50 mm from the foamed molded article and performing a compression test according to JIS K 7220 (2006) using the test piece. .

  In the present invention, it includes not only the case where the sheet pad is made of a thermoplastic resin foam molded article, but also the case where the sheet pad is made of the thermoplastic resin foam particle molded article and a soft urethane resin foam molded article, at least If the backmost surface is made of a thermoplastic resin foamed molded article, the sheet pad can be formed by laminating other members. When the sheet pad is composed of the thermoplastic resin foam molded body and the soft urethane foam molded body, the soft urethane foam molded body is laminated on the front side, and the soft urethane foam molded body includes A communication hole communicating with the through hole of the foamed particle molded body is formed, and the trim cover is hog ringed from the front surface side of the seat pad via the communication hole and the through hole. The trim cover is suspended and locked to the wire on the back side of the seat pad. With the above structure, even when the seat pad is formed by combining the thermoplastic resin foamed particle molded body and the soft urethane foam molded body, the trim cover can be fixed in the same manner by the hog ring. . In such a case, the thermoplastic resin foam molded body is lighter than the conventionally used flexible urethane foam, so that the seat pad can be further reduced in weight.

FIG. 2 is a conceptual perspective view showing a specific embodiment of a wire holding portion formed in a thermoplastic resin foam molded article.
In this embodiment, the protrusion 11 is provided on the back surface side (the side opposite to the side covered with the trim cover) of the seat pad 10 made of a thermoplastic resin foam molded body. The protrusion 11 is provided with a holding portion 13 having a structure in which a slit portion 12 narrower than the diameter dimension of the wire W is provided in a direction orthogonal to the direction of the through hole of the thermoplastic resin foam molded body. When molding the thermoplastic resin foam molding, the vertical direction in FIG. 2 is the mold opening direction. In this case, as shown in FIGS. 3 and 4, a through-hole 14 is provided below the slit portion 12. For example, the slit portion 12 can be formed only by normal molding without performing secondary processing. In FIG. 2, reference numeral 15 denotes a through hole that communicates in the thickness direction of the seat pad 10. Reference numeral 16 denotes a trim cover pull-in groove formed on the front surface side of the seat pad 10.

  In order to hold the wire W using the slit portion 12 formed on the protrusion 11, the wire W is inserted into the slit portion 12 from the lateral direction. Although the connection part with the thermoplastic resin foaming molding main body of the processus | protrusion 11 becomes a stopper of a wire on the operation | work, a wire can be fixed in the arbitrary places in a slit other than a connection part. In addition, when the wire W is held in the form of FIG. 2, the thickness of the upper thermoplastic resin foam forming the slit portion 12 is one factor that affects the fixing force of the wire together with the width of the slit portion 12. However, in view of the general moldability of the thermoplastic resin foam used in the present invention, if the thickness exceeds 5 mm, a sufficient fixing force can be exhibited.

  In FIG. 2, the shape of the protrusion 11 is a cube, but the shape of the protrusion 11 is a different shape determined according to the shape of another component to which the seat pad 10 made of a semi-cylindrical shape, a hemispherical shape, or a thermoplastic resin foam molding is opposed. May be. Further, the width of the slit portion 12 does not have to be the same throughout the slit. For example, as shown in FIG. 4, when inserting the wire W, the width of the slit on the intrusion side is widened so that the wire is easily sandwiched. It is also possible. Further, the direction of the opening of the slit portion 12 is preferably determined in consideration of the direction of the horizontal external force applied by the occupant seated on the seat, and a plurality of slit portions 12 for fixing the wire W are provided. When the protrusions 11 are provided, if the directions of the openings of the slit portions 12 are alternately provided, it is possible to more effectively prevent the wires from being dropped during transportation or suspension work.

FIG. 5 and FIG. 6 are diagrams showing other specific embodiments of the holding portion of the wire formed in the thermoplastic resin foam molded body.
In this embodiment, a protrusion 21 is provided on the back surface side of the seat pad 20 made of a thermoplastic resin foam particle molded body, and the diameter dimension of the wire W in the same direction as the through hole of the thermoplastic resin foam molded body. A narrower slit portion 22 is provided to constitute the wire W holding portion 23. In FIG. 5, reference numeral 24 denotes a through hole communicating with the thickness direction of the seat pad 20. Reference numeral 25 denotes a trim cover pull-in groove formed on the front surface side of the seat pad 20.

  In this embodiment, since the wire W can be inserted in the vertical direction, even when the wire W has a crank-shaped bent portion Wa, the inserting operation is easy. If there are protrusions of the thermoplastic resin foamed particle molded body having a sufficient thickness on the left and right of the slit portion 22 where the wire W is held, a sufficient fixing force can be exerted even with respect to an external force applied during the hanging operation. it can.

  FIG. 6 shows an extended space portion 26 formed in a substantially wire cross-sectional shape at the wire holding position of the formed slit portion 22. In the case of this structure, when the wire W is inserted, there is a feeling (click feeling) that the wire reaches a fixed position, so that the certainty of work can be improved. Since the thermoplastic resin foam molded body used in the present invention is excellent in elasticity and resilience, the expansion space 26 described above in the normal molding without performing a special mold structure or secondary processing. Can be formed in the slit portion 22.

FIG. 7 and FIG. 8 are views showing still another specific embodiment of the wire holding portion formed on the thermoplastic resin foam molded article.
In this embodiment, a concave groove 31 for storing the wire W is provided on the back surface side of the seat pad 30 made of a thermoplastic resin foam molded body, and the wire W for fixing the wire is disposed at an arbitrary position of the concave groove 31. It is the holding | maintenance part 33 of the structure where the slit part 32 narrower than the diameter dimension of this was provided. In the case of this structure, since there is no protrusion on the back side of the thermoplastic resin foam molded article, the entire part can be made compact. Even in the above case, the wire member is exposed and held on the back surface side of the thermoplastic resin foam molded body by the holding portion. In FIG. 7, reference numeral 34 denotes a through hole that communicates in the thickness direction of the seat pad 30. Reference numeral 35 denotes a trim cover pull-in groove formed on the front surface side of the seat pad 30.

  The fixing wire W for the trim cover held by the holding portions having the various structures described above is a metal or resin wire, and has bending rigidity and elasticity necessary for hanging and holding the trim cover. It is. Further, the wire W may be linear or curved according to the shape of the hanging groove formed on the thermoplastic resin foam molded body that houses the trim cover, or a part of the wire for easy hogging operation. A crank-shaped bent portion Wa may be provided to the hoist ring at a position close to the trim cover.

  On the back side of the thermoplastic resin foam molded body, the wires W held by the holding portions having various structures described above are used for hanging and holding the trim cover, and the trim cover is made of a thermoplastic resin foam molded body. Along with the outer surface shape of the seat pad, the sheet pad is stretched in conformity with the shape.

FIG. 9 is a cross-sectional view of a portion corresponding to the portion along the line D-D of FIG. 5, showing an example of a trim cover hanging locking structure when the embodiment of the wire holding portion of FIG. 5 is adopted. is there.
As shown in the figure, the wire W held by the holding portion 23 formed on the back surface side of the thermoplastic resin expanded particle molded body 20 has its crank-shaped bent portion Wa at the thermoplastic resin expanded particle molded body 20. It is held in a state of being inserted into a through hole 24 communicating in the thickness direction. On the other hand, the wire Y is also attached to the hanging part 51 of the trim cover 50, and the hanging part 51 of the trim cover 50 is in a drawing groove 25 formed on the surface side of the thermoplastic resin foamed particle molded body. It is said that it was pulled in. The wire Y attached to the trim cover 50 side and the wire W held on the seat pad 20 side are locked by the hog ring P, and the trim cover 50 is hung on the front surface side of the seat pad 20. It is locked. A plurality of places where the wires W and Y are supported by the hog ring P are set in the hanging groove 25 at predetermined intervals. The predetermined interval between the support portions is appropriately set in consideration of a state in which the seat pad 20 of the trim cover 50 is stretched on the front surface. The hog ring P is formed in a C shape, and the hog ring P as a hog ring attaching tool is used to fix the wires W and Y by the hog ring P using the through hole 24 communicating in the thickness direction of the seat pad 20. It is.

  Although the embodiment of the vehicle seat according to the present invention has been described above, the present invention is not limited to the embodiment described above, and the scope of the technical idea of the present invention described in the claims. Of course, it is possible to provide an embodiment in which various modifications are made. For example, in the above-described embodiment, an embodiment in which a thermoplastic resin foam molded body is used as a seat pad material of a vehicle seat, and a trim cover pull-in groove is formed in the thermoplastic resin foam particle molded body has been described. However, the thermoplastic resin foam molded body is formed at least on the back side of the seat pad, and may have the configuration of the present invention.

  The vehicle seat according to the present invention can be reduced in weight and improved in recyclability, and has very high industrial applicability.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat cushion 3 Seat back 4 Headrest 10 Seat pad which consists of thermoplastic resin foam particle molding 11 Protrusion 12 Slit part 13 Holding part 14 Through part 15 Through hole 16 Retracting groove of trim cover 20 Thermoplastic resin foam particle Sheet pad 21 formed of molded body 21 Protrusion 22 Slit portion 23 Holding portion 24 Through hole 25 Trim cover retracting groove 26 Expansion space portion 30 Sheet pad formed of thermoplastic resin foam particle molded body 31 Concave groove 32 Slit portion 33 Holding portion 34 Through Hole 35 Trim cover lead-in groove 50 Trim cover 51 Trim cover hanging part W wire Wa Wire crank-shaped bent part Y Trim cover side wire P Hog ring

Claims (8)

  A vehicle seat including a seat pad and a trim cover that covers a front surface side of the seat pad, wherein the seat pad is formed of a thermoplastic resin foam molded body, and the back surface side of the foam molded body A holding portion for holding the wire material for locking the trim cover is formed, and the holding portion holds the wire material exposed on the back side of the thermoplastic resin foam molded body. In the body, a through hole communicating in the thickness direction is formed toward the wire material held by the holding portion, and the trim is formed through the through hole from the front surface side of the foam molded body. A vehicle seat, wherein the cover is suspended and locked to the wire member.   The thermoplastic resin foam molded article is a foamed particle molded article made of a polyethylene resin, a polypropylene resin, and a resin selected from a composite resin of a styrene resin and an olefin resin. The vehicle seat according to 1.   3. The vehicle seat according to claim 1, wherein the trim cover is suspended and locked to a wire material held on the back surface side of the thermoplastic resin foam molded body by hog ring. 4.   The vehicular seat according to any one of claims 1 to 3, wherein a compression stress at the time of deformation of 25% of said thermoplastic resin foam molding is 0.06-0.7 MPa.   The vehicular seat according to any one of claims 1 to 4, wherein a compression set of the thermoplastic resin foam molding is 20% or less.   A protrusion is formed on the back side of the thermoplastic resin foam molded body, a slit portion having a width smaller than the diameter of the wire material is formed on the protrusion, and the wire material is sandwiched between the slit portions. The vehicle seat according to claim 1, wherein the wire material is held by the thermoplastic resin foam molded body.   A concave groove that can accommodate a wire material is formed on the back side of the thermoplastic resin foam molded body, and a slit portion that is narrower than the diameter of the wire material is formed in a part of the concave groove, and the slit The vehicle seat according to any one of claims 1 to 5, wherein the wire material is held in a concave groove of the thermoplastic resin foam molded body by sandwiching the wire material in a portion. .   The seat pad is composed of the thermoplastic resin foam molded body and the flexible urethane foam molded body, and the thermoplastic resin foam molded body is formed of a foamed particle molded body, and the foam pad is formed on the front surface side of the foam molded body. A flexible urethane foam molded product is laminated, and the flexible urethane foam molded product has a communication hole communicating with the through hole of the foam molded product, and the trim cover is connected to the communication hole from the front surface side. And through the through-hole, the trim cover is suspended and locked to the seat pad by being connected to the wire material held on the back side of the seat pad by hog ring. The vehicle seat according to claim 7.

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