JP5377891B2 - Cushion pad for seat - Google Patents

Description

  The present invention relates to a cushion pad used for a vehicle seat or a furniture seat, for example.

  Generally, cushion pads made of soft polyurethane foam with high cushioning properties are used for automobile seats, and this is placed on a support frame and covered with a skin on the surface of the pad, etc. Has been.

  In the cushion pad used for such a seat, a back material as a backing material is provided on the back surface of the pad main body in order to prevent or protect the noise caused by rubbing with the support frame. The back material is integrally attached to substantially the entire back surface of the pad body by injecting a foaming raw material into the mold and mounting the pad body in the mold.

In general, a relatively soft backside cloth such as a nonwoven fabric is used alone as the backside material. However, a higher rigidity reinforcing material such as a compression felt may be attached to a part of the backside cloth. It has been proposed (Japanese Patent Laid-Open No. 2006-1213). Conventionally, this type of separate member is attached to the back fabric on the main body side by sewing.
JP 2006-1213 A

  When the reinforcing material is attached to the back cloth by sewing as described above, the positions of the reinforcing material and the back cloth cannot be shifted after the attachment. Therefore, the following inconvenience occurs when the back material is mounted in the mold.

  For example, consider a case in which a through hole is provided in the reinforcing material, and the back material is fixed in the mold by press-fitting the fitting protrusion of the mold into the through hole. In this case, through holes are also provided in the back cloth, and the above sewing is performed and the both are fixed in a state where the through holes of the reinforcing material and the back cloth are overlapped. If there is a misalignment between the reinforcing material and the back fabric during such sewing, the back material cannot be properly attached to the mold, and this causes the back of the cushion pad to be reinforced. Product defects such as exposed material may occur.

  When fixing by sewing, the rigidity (hardness) of the reinforcing material and the back cloth is particularly different, so the positions of both of them are shifted not only when the reinforcing material and the back cloth before sewing are overlapped but also during sewing work. There is a problem that the product defect rate becomes high.

  The present invention has been made in view of the above points, and in a cushion pad for a sheet obtained by foam molding by attaching a back material attached with a reinforcing material to a molding die, the product defect rate can be reduced. It is an object to provide a configuration to perform.

The seat cushion pad according to the present invention includes a pad body made of a foamed resin molded body, and a back surface integrated with the back surface of the pad body by mounting the pad body in a mold when foaming the pad body. A back cushion for covering the back surface of the pad main body and a part of the back surface cloth on the bonding side of the pad main body. than said rear surface fabric consists of a reinforcing material of high rigidity, the back cloth is provided with said mold fitting protrusion provided can be inserted a first through hole, the reinforcing member, the first through A second through hole is provided for fixing the back material in the mold by fitting into the fitting protrusion inserted through the hole, and the first through hole has a diameter larger than that of the second through hole. It is larger, the second consistency and the first through-hole The reinforcing material is fixed to the back cloth by a resin fixing pin in a state where the holes are overlapped, and the fixing pin has a shaft portion penetrating both at the overlapping portion of the back cloth and the reinforcing material, and the shaft. part Ri Do from the rear surface fabric and the locking head which restricts the pull-out of the shaft portion from the reinforcement at both ends of the fixing pins, wherein said rear surface cloth before foam molding step the reinforcing material The length of the shaft portion is set to be larger than the total thickness of the back cloth and the reinforcing material so as to allow relative displacement in the displacement direction .

  According to the present invention, since the reinforcing material is fixed to a part of the back surface cloth using the resin fixing pin having the above-described configuration, there is a degree of freedom in attaching the reinforcing material to the back surface cloth. For this reason, when the back material is mounted on the mold, it is possible to absorb the displacement of the reinforcing material and to fit the fitting protrusion. Therefore, it is possible to eliminate misalignment when the reinforcing material is attached to the back cloth, and to attach the back material appropriately to the mold, thereby improving the mounting workability and reducing the product defect rate. it can.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a cushion pad 10 according to the embodiment, and FIG. 2 is a perspective view of the back side of the cushion pad 10. The cushion pad 10 is a pad used for a seat cushion for supporting a occupant's (occupant) buttocks in an automobile seat, and is provided on a pad main body 12 made of a foamed resin molded body and a back surface 12A (lower surface) thereof. It consists of the back surface material 14 integrated and laminated.

  The pad main body 12 is made of a soft polyurethane foam having a high cushioning property, and includes a wall 16 that protrudes toward the back surface 12A on the front edge 12B and the left and right edges 12C and 12C.

  As shown in FIGS. 1 to 3, the back surface material 14 includes a back surface cloth 18 that covers substantially the entire back surface 12 </ b> A of the pad body 12, and a part of the surface 18 </ b> A on the adhesion side of the back surface cloth 18 to the pad body 12. And a reinforcing material 20 provided in an overlapping manner.

The back cloth 18 is a relatively soft fiber cloth material such as a woven cloth, a knitted cloth, or a non-woven cloth. In this example, the back cloth 18 is preliminarily formed into a three-dimensional shape along the back face shape of the pad main body 12 by hot press molding or the like. Molded felt is used. Although not particularly limited, a fabric having a basis weight of about ²⁰ to 300 g / m ² is preferably used as the back fabric 18.

The reinforcing member 20 is a fiber member having a thicker plate shape and higher bending rigidity than the back cloth 18, and in this example, a compression felt is used. For compression felt, fibers such as cotton, rayon, nylon, and polyester are arranged in a web or mat shape by an appropriate method, and this is pressed with various binders to bond the fibers together, or a binder is used. It is obtained by hot pressing without using the fibers and bonding the fibers together by fusing, and is also called a press felt. Although not particularly limited, a material having a basis weight of about 400 to 1200 g / m ² is preferably used as the reinforcing material 20.

  In this example, the reinforcing material 20 is provided so as to overlap the corners of the back cloth 18. Specifically, the reinforcing material 20 is attached to two left and right corners on the rear side of the back cloth 18 corresponding to the rear end portion of the cushion pad 10.

  The back material 14 is laminated and integrated with the pad main body 12 by being mounted in a molding die 50 (see FIG. 6) when the pad main body 12 is foam-molded. Therefore, the back material 14 is provided with a means for fixing in the mold 50. In this example, circular fitting holes 22 that fit into the first fitting protrusions 60 provided in the mold 50 are provided at the two left and right corners on the front side of the back cloth 18. Further, the back cloth 18 is provided with a circular first through hole 24 into which the second fitting protrusion 62 provided in the mold 50 can be inserted, and the first through hole 24 is inserted into the reinforcing member 20. A circular second through-hole 26 for fixing the back surface material 18 in the mold 50 by being fitted to the second fitting protrusion 62 is provided.

  The first through holes 24 are respectively provided at two left and right corners on the rear side of the back cloth 18 on which the reinforcing material 20 is provided, and two front and rear are respectively provided at each corner. Two second through holes 26 are provided at the front and rear ends of the reinforcing member 20 so as to correspond to the first through holes 24. As shown in FIG. 4, the first through hole 24 is set to have a diameter larger than that of the second through hole 26, and a certain amount of error is allowed in the alignment of both.

  As shown in FIGS. 4 and 5, the back cloth 18 and the reinforcing member 20 are fixed by a resin fixing pin 28 in a state where the first through hole 24 and the second through hole 26 are overlapped. The fixing pin 28 regulates the pull-out of the thin rod-shaped shaft portion 30 penetrating both at the overlapping portion of the back surface cloth 18 and the reinforcing material 20 and the shaft portion 30 from the back surface cloth 18 and the reinforcing material 20 at both ends thereof. It consists of a pair of locking heads 32, 32. In this example, the locking head portion 32 is configured as a horizontal bar portion extending in a direction orthogonal to the shaft portion 30 so that both ends of the fixing pin 28 form a T shape. The shape of the locking head 32 is not particularly limited as long as it is widened so as to prevent the shaft 30 from being pulled out. As such a fixing pin 28, a resin tag pin generally used for attaching a tag (price tag) to a product is preferably used because it has flexibility.

  As shown in FIG. 5, the fixing pin 28 is set such that the length L of the shaft portion 30 is larger than the total thickness M of the back cloth 18 and the reinforcing material 20. The relative displacement in the shift direction X between the back cloth 18 and the reinforcing member 20 is sufficiently allowed. Even when the length L of the shaft portion 30 is equal to the total thickness M of the back cloth 18 and the reinforcing material 20, the relative displacement in the displacement direction X to some extent is due to the structure of the fixing pin 28 and the flexibility of the material. Although it is possible, relative displacement can be performed more easily by setting this length L large.

  The fixing pins 28 are installed at two locations across the second through hole 26 to fix the back cloth 18 and the reinforcing material 20. Specifically, as shown in FIG. 4, the fixing pins 28 are installed at both ends of the reinforcing member 20, and are arranged near the end portions of the two second through holes 26 before and after the reinforcing member 20.

  As shown in FIG. 4, a positioning projection 34 is formed on the back cloth 18 at a position where the reinforcing material 20 is overlapped. The convex portion 34 can be formed simultaneously with the molding of the molding felt, for example. Further, the reinforcing material 20 is provided with a V-shaped positioning notch 36 at the edge thereof, and the reinforcing material 20 is fixed to the back surface cloth 18 by aligning the notch 36 with the convex portion 34 of the back surface cloth 18. It is configured to be. By the alignment, the first through hole 24 and the second through hole 26 are attached in an overlapped state. The notch 36 is provided in the central portion of the reinforcing member 20 located between the two second through holes 26.

  Next, a method for manufacturing the cushion pad 10 will be described.

  At the time of manufacturing, as shown in FIG. 3, the back material 14 is formed by fixing the reinforcing material 20 to a predetermined portion of the back fabric 18 with a fixing pin 28. At that time, in a state where the reinforcing material 20 is positioned on the back surface cloth 18 so that the positioning notch 36 of the reinforcing material 20 fits in the positioning convex portion 34 of the back surface cloth 18, a tag attachment machine called a tag gun is used. Using the fixing pin 28, the reinforcing member 20 is fixed to the back cloth 18.

  Next, as shown in FIG. 6, the obtained back material 14 is set in a mold 50 for foam-molding the pad main body 12 so that the reinforcing material 20 faces the cavity 58.

  The mold 50 includes a lower mold 52 that opens upward to mold the front surface (upper surface) side of the cushion pad 10 and an upper mold 54 that molds the back surface (lower surface) side of the cushion pad 10. The upper die 54 is provided so as to be rotatable with respect to the lower die 52 via the hinge portion 56, and corresponds to the pad shape between the lower die 52 by opening and closing the upper surface opening of the lower die 52. It is comprised so that the cavity 58 which is a foaming space may be formed.

  The upper mold 54 has a plurality of columnar first fitting protrusions 60 that are press-fitted into the fitting holes 22 of the back cloth 18 as locking means for locking the back material 14, and a reinforcing material. A plurality of columnar second fitting protrusions 62 that are press-fitted into the 20 second through holes 26 are provided.

  When the back material 14 is mounted, the first fitting protrusion 60 of the upper mold 54 is press-fitted and fixed in the fitting hole 22 of the back cloth 18, and then the back cloth 18 is pulled to follow the mold surface of the upper mold 54. The second fitting projection 62 of the upper mold 54 is press-fitted and fixed to the second through hole 26 of the reinforcing member 20 while being fitted. At the time of press-fitting into the second fitting protrusion 62, as shown in FIGS. 7 and 8, it is inserted into the first through-hole 24 of the back cloth 18 and press-fitted into the second through-hole 26 of the reinforcing material 20. At that time, since the reinforcing member 20 is attached to the back cloth 18 by the fixing pin 28 in a state allowing relative displacement in the shifting direction X as described above, the displacement of the reinforcing member 20 can be easily absorbed. The second fitting protrusion 62 can be fitted.

  After the back material 14 is set in the molding die 50 in this way, a polyurethane foam raw material M as a foaming raw material is injected into the lower die 52 from an injection device (not shown), the molding die 50 is closed, and the cavity The pad body 12 is foam-molded in 58. Thereby, the back surface material 14 is integrally attached to the back surface 12 </ b> A of the pad main body 12. Thereafter, the upper die 54 is opened and removed to obtain the cushion pad 10.

  According to this embodiment described above, the reinforcing material 20 is fixed to the back cloth 18 using the above-described specific fixing pin 28, and the reinforcing material 20 is attached to the back cloth 18 with a degree of freedom. Therefore, even when the reinforcing material 20 is misaligned and attached to the back cloth 18 when the back material 14 is mounted on the mold 50, the misalignment is easily absorbed and the reinforcing material 20 is removed. The second fitting protrusion 62 can be fitted. Therefore, the displacement of the reinforcing material 20 can be eliminated, and the back surface material 14 can be appropriately mounted on the mold 50, and the mounting workability is excellent, and the reinforcing material 20 is exposed on the back surface of the cushion pad 10. Thus, the defect rate can be reduced.

  In addition, the fixing pin 28 such as a tag pin is generally difficult to secure a sufficient fixing strength, but the reinforcing material 20 is attached to a very small part such as a corner of the back surface cloth 18, and the back surface cloth 18. Therefore, it is possible to prevent the reinforcing material 20 from falling off due to the tearing of the back cloth 18 or the fixing pin 28 during the handling before foam molding. In addition, although this embodiment demonstrated the case where the reinforcing material 20 was provided in the corner | angular part of the back surface cloth 18, you may provide not only in a corner | angular part but in the edge part of the back surface cloth 18. FIG.

  Further, when the reinforcing member 20 is fixed to the back surface cloth 18, both are positioned and overlapped by positioning the positioning projections 34 and the notches 36, so that the reinforcing material is partially attached to the back surface cloth 18 as described above. While 20 is fixed, it can be accurately aligned and attached.

  In addition, in the said embodiment, although applied to the seat cushion pad for supporting a seated person's buttocks, it can also be applied to a backrest part.

Vertical sectional view of a cushion pad according to an embodiment Perspective view of the back side of the cushion pad The perspective view of the back material in an embodiment Main part enlarged plan view of the back material VV line sectional view of FIG. Sectional view at the time of foam molding in the same embodiment The principal part expanded sectional view which shows the state in the middle of attaching the back material to the forming die The principal part expanded sectional view which shows the state which attached the back material to the shaping die

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Cushion pad 12 ... Pad main body, 12B ... Back surface 14 ... Back surface material 18 ... Back surface cloth, 18A ... Surface 20 on the adhesion side with pad main body ... Reinforcement material 24 ... First through-hole 26 ... Second through-hole 28 ... Fixed Pin 30 ... Shaft 32 ... Locking head 34 ... Positioning projection 36 ... Positioning notch 50 ... Mold 62 ... Second fitting protrusion (fitting protrusion)
L: Length of shaft portion M: Total thickness X of the back cloth and the reinforcing material X: Direction of displacement

Claims (4)

A cushion pad for a seat comprising: a pad main body made of a foamed resin molded body; and a back material integrated with the back surface of the pad main body by mounting the pad main body in a mold when foaming the pad main body. There,
The back surface material is composed of a back surface cloth covering the back surface of the pad main body, and a reinforcing material which is provided on a part of the surface of the back surface cloth on the bonding side with the pad main body and is more rigid than the back surface cloth. ,
The back cloth is provided with said mold fitting protrusion provided can be inserted a first through hole, the reinforcing member may be fitted to the fitting projection inserted through the first through hole And the second through hole for fixing the back material in the mold, the first through hole is formed larger in diameter than the second through hole,
In a state where the first through hole and the second through hole are overlapped, the reinforcing material is fixed to the back cloth by a resin fixing pin, and the fixing pin is an overlapping portion of the back cloth and the reinforcing material. a shaft extending through both, Ri Do and a locking head to regulate the pulling out of the shaft portion from the back cloth and the reinforcing member at both ends of the shaft portion,
In the fixing pin, the length of the shaft portion is larger than the total thickness of the back surface cloth and the reinforcing material so as to allow relative displacement in the shift direction between the back surface cloth and the reinforcing material before the foam molding. Set to large,
A cushion pad for seats characterized by the above. The reinforcement corner or a sheet cushion pad of claim 1, wherein the superimposed provided at the edge of the back cloth. The cushion pad for seats according to claim 1 or 2 in which said reinforcing material consists of a thick felt compression felt rather than said back cloth. Positioning projections are formed on the backside cloth, positioning notches are provided at the edges of the reinforcing material, and the reinforcing material is aligned with the notches of the backing fabric. The seat cushion pad according to any one of claims 1 to 3 , wherein the seat cushion pad is fixed to a back cloth.

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