JP2013129324A - Seat cushion for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat cushion which is lighter than a seat cushion including a seat cushion pad equipped with an inner wire or the like.SOLUTION: The seat cushion is formed with hard synthetic resin foam, and comprises components including: a seat cushion pad; and a surface skin covering the surface of the seat cushion pad. The seat cushion pad is formed with a concave shape section or a convex shape section for fitting in and locking in a nearly horizontal direction, in the combination of a front edge face section and a rear edge face section or in the combination of a right edge face section and a left edge face section while being mounted on a vehicle and on any one edge face section of each of the combinations. The seat cushion pad has a concave shape section for fitting in and locking in the nearly horizontal direction, which is extended on the bottom surface in the vicinity of the other edge face section, wherein there is formed a projection piece body with a tapered shape in the tip section thereof nearly vertically in a lower section of the concave shape section.

Description

  TECHNICAL FIELD The present invention relates to a vehicle seat cushion mounting structure, and more particularly to a vehicle seat cushion mounting structure on a floor panel when foamed polypropylene or the like that is lighter than foamed urethane is used for the purpose of weight reduction. It is.

  The vehicle seat has a seat cushion for seating and a seat back standing upward from the rear part of the seat cushion. As described in Patent Document 1, Patent Document 2, and Patent Document 3, The cushion is provided with a seat cushion frame or wire inside a seat cushion pad made of urethane foam, and a fitting that is connected to the cushion frame or wire by welding or the like is provided. It is fixed to the panel.

JP-A-3-68131 Japanese Patent Laid-Open No. 7-25278 JP 62-152836 A

  Since the seat cushions described in Patent Document 1, Patent Document 2 and Patent Document 3 are provided with a seat cushion frame and a wire inside the seat cushion pad and an attachment is provided, the seat cushion frame, the wire, and the attachment There is a problem that the weight of the seat cushion is not increased because the total weight of the tools (hereinafter collectively referred to as a metal frame group) is increased.

  In addition, soft foamed urethane is mainly used as the material for the seat back with the metal frame group. The soft foamed urethane used for the seat back includes various elastic modulus, permanent strain, flexibility, etc. In consideration of physical properties, those having a relatively heavy weight have been used. Therefore, as the weight of the seat cushion, there is a problem that the weight of the seat cushion, in addition to the metal frame group, hinders weight reduction.

  Accordingly, an object of the present invention is to reduce the weight of a seat made of soft foamed urethane, which does not require a metal frame group such as a seat cushion frame, a wire, and a fixture, and is mainly used as a material for a seat back. It is providing the vehicle seat cushion which can implement | achieve.

  In the present invention, the soft synthetic resin foam is a soft foamed urethane mainly used as a material for a seat cushion, or a resin made by foaming with a resin material different from the soft foamed urethane to increase the foaming rate. Means foam.

  In order to solve the problem described in “Problems to be Solved by the Invention”, the invention of the vehicle seat cushion 1 according to claim 1 is formed of a hard synthetic resin foam, and the front end face portion 4 is mounted in the vehicle. And a combination of the rear end surface portion 5 or a combination of the right end surface portion and the left end surface portion, and a substantially horizontal concave portion or convex portion 8 for fitting and locking to one end surface portion of the respective combinations. And having a substantially horizontal recess shape portion for fitting and extending, which is extended on the bottom surface in the vicinity of the other end surface portion, and the lower end portion of the recess shape portion is tapered in a substantially vertical direction. The seat cushion pad 2 formed with the projecting piece body 9 having the above and the skin 3 covering the surface of at least the upper surface, the front surface and the side surface of the seat cushion pad 2. And butterflies.

  The invention of the vehicle seat cushion 1 according to the second aspect is the invention according to the first aspect, in which the stick piece 9 is pressed from the substantially horizontal direction against the protruding piece body 9 having the recessed portion in the substantially horizontal direction which is in the locked state. Is added, the projecting piece body 9 bends and is removed from the locked state.

  In the first aspect of the invention, the seat cushion is made of a hard material such as foamed polystyrene, foamed polyethylene, foamed polypropylene, or a foamed composite resin made of a composite resin of polystyrene and polyolefin, which is lighter than a soft synthetic resin foam such as urethane foam. Since the synthetic resin foam is used and the seat cushion frame 19 and the wire 20 are not inserted into the seat cushion, the weight is reduced compared to the conventional seat cushion.

  In addition, rigid synthetic resin foams such as foamed polystyrene, foamed polyethylene, foamed polypropylene, or foamed composite resin made of a composite resin of polystyrene and polyolefin, which can be made lighter than urethane foam and have high rigidity. Since the body and the shape of the locking portions 30 and 31 can be formed by the seat cushion material itself, the metal frame group such as the seat cushion frame 19 and the wire 20 inserted in the seat cushion becomes unnecessary. The number of parts can be reduced, the weight can be reduced, and the material can be reduced.

  Accordingly, a sheet made of a resin material such as foamed polystyrene or foamed polypropylene is obtained by making a part of the seat cushion 1 made of a rigid resin material such as foamed polystyrene or foamed polypropylene into a special shape called a locking portion. The cushion 1 can be provided with a locking function, and the metal frame group can be dispensed with.

  The invention according to claim 2 has the same effect as that of claim 1. Furthermore, when the projecting piece body 9 that is the locking portion 31 is pushed with a rod-like object, the projecting piece body 9 is bent and can be easily removed, so that it is possible to easily recycle.

It is explanatory drawing of the vehicle seat cushion in a vehicle use condition. It is a longitudinal cross-sectional schematic diagram of the front-back direction of the vehicle seat cushion of this invention. It is a longitudinal cross-sectional schematic diagram of the front-back direction of the vehicle seat cushion of a prior art. It is an isometric view schematic diagram of the vehicle seat cushion of a prior art. It is a perspective schematic diagram of the vehicle seat cushion turned over by the prior art.

  Hereinafter, an embodiment of a vehicle seat cushion 1 according to the present invention will be described with reference to FIGS. 1 and 2. The vehicle seat cushion 1 according to the present invention is a portion of the configuration of the vehicle seat shown in FIG. 1 that supports the weight of the seated person by contacting the lower limbs when the seated person is seated.

  The vehicle seat cushion 1 of the present invention shown in FIG. 2 is formed of a hard synthetic resin foam, and is a combination of the front end face part 4 and the rear end face part 5 or a combination of the right end face part and the left end face part when mounted on the vehicle. The fitting lock is formed by forming a substantially horizontal recessed portion or protruding portion 8 for fitting and locking on one end surface portion of the combination, and extending on the bottom surface in the vicinity of the other end surface portion. And a seat cushion pad 2 having a protruding piece body 9 having a substantially horizontal recess shape portion and a tip portion of the lower portion of the recess shape portion tapering in a substantially vertical direction, and the seat cushion pad 2. And a skin 3 that covers at least the upper surface, the front surface, and the surface of the side surface.

  Hereinafter, the components of the vehicle seat cushion 1 according to the present invention will be described.

  The seat cushion pad 2 is made of a hard synthetic resin foam such as foamed polystyrene, foamed polyethylene, foamed polypropylene, or a foamed composite resin made of a composite resin of polystyrene and polyolefin.

  Among the resin foams, the material constituting the seat cushion pad 2 in the present invention is preferably a bead foam molded body that can be easily shaped arbitrarily in the resin foam. The selected bead foam molding is selected from the polystyrene bead foam molding, the polypropylene bead foam molding, the polystyrene-polyethylene composite bead foam molding, and the polyethylene bead foam according to the purpose, application, and required performance. Is done. The material is not particularly specified as long as it satisfies the purpose, application, and required performance, but it is particularly preferable to use a polypropylene-based bead foam molded product from the viewpoint of balancing lightness and flexibility. .

In view of recent market conditions, as a urethane for a sheet, a polyurethane pad manufactured by a cold cure method is used, and a density of 35 to 75 kg / m ³ is required. On the other hand, with respect to the lightness of the seat cushion 1 of the present invention, in order to obtain the same bending feeling in this manufacturing method using EPP, the density is 35 kg / m ³ or less and the foam volume is reduced by 30% or more. Expected.

  Moreover, as a foam which comprises the said seat cushion pad 2, the in-mold molded object of a foamed resin particle is still more preferable from viewpoints, such as the uniformity of a mechanical physical property, the freedom degree of a design shape.

In the present invention, the hard synthetic resin foam is a resin obtained by foaming a base resin of 700 MPa or more with a tensile elastic modulus (E) specified by ASTM D 883 by the base resin constituting the hard synthetic resin foam. Defined as foam. The shape of the test piece needs to be measured with a Type I test piece described in ASTM D638. The higher the elastic modulus of the base resin, the harder the material even when the resin foam is used, but the thickness of the seat cushion pad 2 for comfort can be reduced. The elastic modulus E of the base resin is preferably 700 MPa or more in order to easily achieve the weight reduction that is the object of the invention. Here, the test piece to be used for the test of ASTM D638 is sandwiched between hard synthetic resin foams at a temperature of 200 ° C., pressed at a pressure of 200 kgf / cm ² , and made to prevent air from being involved. A hot press sheet can be employed as a base resin constituting the hard synthetic resin foam.

In addition, the preferable density range of a hard synthetic resin foam is 15-35 kg / m < ³ >, More preferably, it is 18-25 kg / m < ³ >.

  The seat cushion pad 2 is filled with a resin material that is lighter but harder than urethane generally used in vehicles, such as foamed polystyrene and foamed polypropylene, in the mold of the seat cushion pad 2. The seat cushion pad 2 is formed by heating and foaming.

  As shown in FIG. 2, the seat cushion pad 2 is composed of a top surface portion with which a lower limb portion of a seated person contacts, a front end surface portion 4, a rear end surface portion 5, a right end surface portion, a left end surface portion, and a bottom surface portion. A resin material is filled in the interior surrounded by each part, and supports the lower limbs of the seated person and supports the weight thereof.

  By changing the thickness of the seat cushion pad 2 made of a resin material, it is possible to adjust the hardness that a seated person feels when seated, and to ensure good sitting comfort.

  Since the seat cushion pad 2 is lightweight but has rigidity, it is not necessary to insert the seat cushion frame 19 and the wire 20 as shown in FIG. 3 used when the seat cushion pad 2 is fixed, As shown in FIGS. 4 and 5, the attachment portions 21 and 22 fixed to the seat cushion frame 19 and the wire 20 may not be provided. Therefore, as shown in FIG. 2, locking portions 30 and 31 having functions of the attachment portions 21 and 22 are formed integrally with a part of the seat cushion pad 2 when the seat cushion is formed.

  The engaging portion 30 on the fitting side forms a concave portion or convex portion 8 in the substantially horizontal direction on one end surface portion, and the engaging portion 31 on the inserting and fitting side is in the vicinity of the other end surface portion. A projecting piece body 9 is formed which has a substantially horizontal recess-shaped portion extending on the bottom surface, and has a shape in which a lower end portion of the recess-shaped portion is tapered in a substantially vertical direction.

  An example of the locking portions 30 and 31 will be described with reference to FIG. The example of FIG. 2 shows a combination of the front end surface portion 4 and the rear end surface portion 5, and a U-shaped recess-shaped portion 32 having an opening in the rearward direction in a substantially horizontal direction on the rear end surface portion 5 side in a vertical section. In addition, a protruding piece body 9 extending on the bottom surface in the vicinity of the front end surface portion 4 is formed integrally, and the shape of the protruding piece body 9 is open in the forward direction. A U-shaped recessed portion 33 having a portion, and a lower end of the recessed portion is tapered in a substantially vertical direction.

  When the seat cushion is fixed to the floor panel 40 by integrally forming the locking portions 30 and 31 as shown in FIG. 2, first, the concave shape portion formed on the rear end surface portion 5 side is assembled. The cross-sectional shape projecting on the floor panel 40 side, which is the mating side, is pushed into the projection 42 having a circular shape in the horizontal direction from the front side and fitted.

  Next, the projecting piece body 9 extended on the bottom surface in the vicinity of the front end surface portion 4 is inserted downward from above into a hollow portion 43 provided on the floor panel 40 side which is the mating counterpart. Since the projecting piece body 9 has flexibility and has a tapered shape at the time of insertion, the projecting portion 44 projects in the rearward direction in the horizontal direction on the floor panel 40 side. The piece 9 is bent further and pushed downward, and a U-shaped recessed portion 33 having an opening in the forward direction of the protruding piece 9 is fitted into the protrusion 44 so that the seat cushion pad 2 is It is assembled and fixed to the floor panel 40 side.

  Although the example of the latching structure of this invention was shown in FIG. 2, this invention is not limited to this.

  For example, if the form on the floor panel 40 side including the fixture, which is the mating counterpart, is the concave shape, the shape on the seat cushion side is the convex shape. In addition, the form of the other side to be fixed after fitting one is in the form of inserting and fixing the rod-like body from the floor panel 40 side which is the mating counterpart to the protruding piece body 9 side of the seat cushion, The protruding piece body 9 on the seat cushion side is not provided with a concave shape, but is provided with a hole having substantially the same inner diameter as the outer diameter of the rod-shaped body.

  Next, when the protruding piece body 9 having the recessed portion in the substantially horizontal direction in the locked state is pressed with a rod-shaped body from the substantially horizontal direction, the protruding piece body 9 bends and is easily locked. Can be removed from. As a result, the seat cushion pad 2 can be easily recycled.

  FIG. 2 illustrates removal from the locked state. In FIG. 2, a hole 45 is provided in the horizontal direction on the floor panel 40 side, which is the other side to be assembled, and when the rod-like body is inserted into the hole 45 from the front toward the rear, the seat cushion pad 2 The protruding piece body 9 is bent, and the protruding piece body 9 can be easily removed from the locked state due to the fitting in the uneven portion.

  The skin 3 is a cloth-like material made of woven or knitted fabric, vinyl leather, leather, or the like that covers at least the front surface, side surface, and upper outer peripheral surface of the seat cushion pad 2.

  According to the vehicle seat cushion 1 having the above configuration, the following operational effects are obtained. Rigid synthetic resin foam, such as foamed polystyrene, foamed polyethylene, foamed polypropylene, or foamed composite resin composed of a composite resin of polystyrene and polyolefin, which is lighter and more rigid than conventional soft synthetic resin foams such as urethane foam By using the body, the seating comfort of the seated person can be made comfortable by changing the thickness of the seat cushion pad 2, and the seat cushion frame 19 and the wire 20 are not inserted into the seat cushion pad 2. Since it can be fixed to the floor panel 40 side, it can contribute to weight reduction, the number of parts can be reduced, and the locking portions 30, 31 that have been fixed once can be easily removed and recycled. It has the effect that it can be made easy.

DESCRIPTION OF SYMBOLS 1 Vehicle seat cushion 2 Seat cushion pad 3 Skin 4 Front end surface part 5 Rear end surface part 8 Concave shape part or convex part shape part 9 Projection piece body 19 Seat cushion frame 20 Wire 21 Attachment part 22 Attachment part 30 Engagement part 31 Engagement Part 32 U-shaped recessed part 33 33 U-shaped recessed part 40 Floor panel 42 Projection body 43 Recessed part 44 Projection part 45 Hole

Claims (2)

  It is formed of a hard synthetic resin foam, and it is a combination of a front end face part and a rear end face part in a vehicle mounted state, or a combination of a right end face part and a left end face part. A substantially horizontal recess-shaped part or a convex-shaped part, and has a substantially horizontal recess-shaped part for fitting engagement extending on the bottom surface in the vicinity of the other end surface part. A seat cushion pad formed with a projecting piece having a shape with a tip portion tapered in a substantially vertical direction, and a skin covering at least the upper surface, front surface, and side surface of the seat cushion pad. A vehicle seat cushion.   When a projecting piece body having a recessed portion in a substantially horizontal direction that is in a locked state is pressed with a rod-shaped body from a substantially horizontal direction, the projecting piece body is deflected and pulled out of the locked state. The vehicle seat cushion according to claim 1.

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