JP5442511B2 - Manufacturing method of seat pad - Google Patents

Description

  The present invention relates to a method of manufacturing a seat pad used for an automobile seat or the like.

  In general, a seat pad made of a soft polyurethane foam having a high cushioning property is used for an automobile seat. The seat pad is placed on a support frame and covered with a skin material as a vehicle seat. It is configured.

  In such a seat pad, for example, in order to ensure rigidity at the side portion, a small pad made of chip urethane having a hardness higher than that of the pad body may be provided on the bottom surface side of the side portion. The small pad is embedded and integrated in the pad main body by being held on the inner surface of the mold and supplying the foaming stock solution into the mold for foaming.

  Conventionally, in order to hold the small pad on the inner surface of the mold, as shown in FIG. 10, a plurality of pins 100 are provided on the inner surface of the mold, and the outer periphery of the small pad 101 is sandwiched between the plurality of pins 100. Thus, the small pad 101 is attached in a mold.

  However, with such a mounting method using the pin 100, there is a risk that the operator may be injured by the pin when mounting to the mold. Further, when the upper mold is opened after foaming molding of the seat pad, or when the seat pad is removed from the upper mold, the pin 100 may interfere with the seat pad and damage such as tearing may occur.

  In Patent Document 1 below, in order to improve the positioning of the chip (small pad) with respect to the mold and to prevent damage to the chip, a cross-shaped slit is provided in the chip, and the tip is formed on the inner surface of the mold. A method is disclosed in which an enlarged pin is provided, and the chip is held in a mold by engaging the slit and the pin. However, in this case as well, as long as pins that protrude greatly from the inner surface of the mold are provided, the seat pad may be damaged when the upper mold is opened or when the seat pad is removed from the upper mold.

JP 2001-170948 A

  The present invention has been made in view of the above points, and provides a seat pad manufacturing method capable of improving the workability of attaching a small pad to a mold and reducing the risk of damage to the seat pad. For the purpose.

In the seat pad manufacturing method according to the present invention, the small pad is held on the inner surface of the mold, and the foam pad is supplied and foamed into the mold so that the small pad is integrated with the pad body. In the method for manufacturing a seat pad, a protrusion having a cross-sectional shape with an enlarged front end side is provided on the inner surface of the mold, and the protrusion is fitted to a mounting surface of the small pad with respect to the mold. A concave groove is provided, and the small pad is held in the mold by fitting the protruding line and the concave groove. In the invention according to claim 1, the concave groove is formed in a groove shape that opens on both side surfaces of the small pad at both ends in the longitudinal direction across the mounting surface of the small pad, and the concave groove The both ends of the protrusion are made to coincide with both ends in the longitudinal direction of the protrusion, and the protrusion and the groove are fitted. In the invention of claim 2, a recess is provided on one side surface of the ridge, and when the ridge and the groove are fitted, one side surface of the ridge and the side surface of the groove A gap is formed between the recesses by the recess.

  According to the present invention, a concave groove formed on a mounting surface of a small pad is fitted to a convex strip having a cross-sectional shape with an enlarged tip provided on the molding die so that the small pad is held by the molding die. Because of the holding effect by the above-mentioned transverse cross-sectional shape itself and the holding effect by the concave-convex fitting extending in the longitudinal direction by the ridges and grooves, it is sufficient even if it does not protrude greatly from the inner surface of the mold like a pin A good holding effect. Therefore, it is possible to reduce the risk of damage to the seat pad when opening the upper die or removing the seat pad while improving the workability of attaching the small pad to the mold.

The perspective view of the seat pad in one Embodiment of this invention The perspective view of the seat pad shaping | molding die in embodiment Sectional view before attaching the molding die and the small pad in a section corresponding to line III-III in FIG. Sectional view in the same mounting state as above Perspective view showing mounting structure of mold and small pad Sectional drawing which shows the attachment structure of the shaping | molding die and small pad concerning other embodiment Furthermore, sectional drawing before attachment of the shaping | molding die which concerns on other embodiment, and a small pad Sectional drawing in the attachment state in embodiment of FIG. Furthermore, the perspective view which shows the attachment structure of the small pad to the shaping | molding die concerning other embodiment The perspective view which shows the attachment structure of the small pad to the conventional shaping | molding die

  Embodiments of the present invention will be described below with reference to the drawings.

  A seat pad 10 according to the embodiment shown in FIG. 1 is a pad used for a seat cushion for supporting a buttocks of an occupant who is a seat in an automobile seat, and is a foamed molded article having elasticity such as a flexible polyurethane foam. Consists of. In this example, the seat pad 10 is a seat cushion pad in a two- or three-seat rear seat of an automobile, and includes a pad main body 12 made of a flexible polyurethane foam, and a back surface (lower surface) in a side portion of the pad main body 12. And a small pad 14 embedded and integrated on the side. Reference numeral 16 denotes a portion corresponding to a seat portion on which an occupant sits.

  The small pad 14 is embedded in order to ensure the rigidity of the side portion of the rear seat. In this example, a chip urethane molded body having a hardness higher than that of the pad main body 12 is used. The chip urethane molded body is formed by press-molding a flexible polyurethane foam chip together with a binder, and can be easily molded into a desired shape, and the hardness can be easily adjusted. The small pad 14 has a rectangular parallelepiped shape in this example, and is embedded in a state in which one surface is exposed on the back surface of the seat pad 10.

  The small pad 14 is not limited to a chip urethane molded body. For example, various chips formed by press molding a foamed resin other than urethane together with a binder, slab materials made of various foamed resins such as slab urethane, polyurethane Examples include various foamed resin molded articles such as foam molded articles, bead-method foamed polypropylene molded articles such as PP beads, and molded articles of various elastic materials such as silicone rubber. In the present embodiment, the small pad 14 has a higher hardness than the pad main body 12 in order to impart rigidity. However, the present invention is not limited to this, and the lower hardness than the pad main body 12 in order to impart flexibility. A thing may be used.

  FIG. 2 shows a molding die 20 for foam-molding the seat pad 10. The lower die 22 opens upward for molding the pad surface (upper surface) side, and the upper die 24 for molding the pad back surface (lower surface) side. Is provided. The upper die 24 is provided so as to be rotatable with respect to the lower die 22 via a hinge 26 arranged on one side of the lower die 22. By opening and closing the upper surface opening of the lower die 22, A cavity which is a foaming space corresponding to the pad shape is formed between the two.

  When the seat pad 10 is manufactured using the molding die 20, the small pad 14 is held on the inner surface of the molding die 20, and the foam main solution is supplied to the molding die 20 for foaming to make the pad main body 12 small. The pad 14 is integrally foam-molded.

  On the inner surface of the mold 20, a ridge 28 for holding the small pad 14 is provided. As shown in FIG. 2, the ridges 28 are provided on the left and right sides of the upper mold 24, respectively, and are formed in straight streaks extending in the left-right direction.

  As shown in FIG. 3, the ridge 28 has a cross-sectional shape (a shape in a cross section perpendicular to the longitudinal direction of the ridge 28) in which the tip 28 </ b> B is enlarged. In this example, the cross-sectional shape of the ridge 28 is an inversely tapered shape (inverse trapezoidal shape) that gradually spreads from the base portion 28 </ b> A of the ridge 28 toward the tip 28 </ b> B, and is constant in the longitudinal direction of the ridge 28. The cross-sectional shape is formed.

  On the other hand, the small pad 14 is provided with a concave groove 30 on the mounting surface 14 </ b> A for the mold 20, into which the ridge 28 is fitted. The concave groove 30 has a cross-sectional shape corresponding to the ridge 28 as shown in FIG. 3, and thus has a cross-sectional shape in which the back side is enlarged with respect to the opening side, and more specifically, A reverse taper shape (reverse trapezoidal shape) that gradually widens from the attachment surface 14A on the opening side toward the back side is formed in a dovetail shape (see FIG. 5). Moreover, the concave groove 30 has a straight shape and is formed in a constant cross-sectional shape in the longitudinal direction, like the ridge 28. The concave groove 30 is dimensioned so that the convex stripes 28 can be fitted without any gaps, and the small pads 14 are firmly held in the mold 20 by fitting the convex stripes 28 with the concave grooves 30. It is configured to be.

  As shown in FIG. 5, the concave groove 30 is formed in a groove shape that crosses the attachment surface 14A of the small pad 14 and opens to both side surfaces 14B and 14C of the small pad 14 at both longitudinal ends 30E and 30E. . Specifically, the concave groove 30 is formed in the lateral direction (the short side of the mounting surface 14A) of the mounting surface 14A at the central portion in the vertical direction of the mounting surface 14A (the direction along the long side of the rectangular mounting surface 14A). It is formed so as to traverse the entire width in the direction along.

  On the other hand, the ridge 28 fitted in the groove 30 is set to have the same length in the longitudinal direction as the groove 30, whereby the longitudinal ends 30 </ b> E and 30 </ b> E of the groove 30 are connected to the ridge 28. The ridges 28 and the grooves 30 can be fitted to coincide with both ends 28E and 28E in the longitudinal direction.

  As shown in FIGS. 2 to 4, in this example, a fitting recess 32 for receiving the end of the small pad 14 on the mounting surface 14 </ b> A side is provided on the inner surface of the mold 20 (specifically, the upper mold 24). Therefore, the positioning of the small pad 14 with respect to the mold 20 is facilitated, and the holding stability of the small pad 14 with respect to the upper mold 24 is enhanced.

  The fitting recess 32 is formed by a frame-like protrusion 34 protruding from the mold surface so as to surround the end of the small pad 14 on the mounting surface 14A side over substantially the entire circumference. The ridge 28 is formed so as to connect the left and right sides of the frame-shaped protrusion 34 across the fitting recess 32 (see FIG. 2). The frame-shaped protrusion 34 is partially cut away in the circumferential direction in this example, but the frame-shaped protrusion includes such a cut-out shape.

  The small pad 14 fitted in the fitting recess 32 does not necessarily have to be fitted in the fitting recess 32 without any gaps, and as long as the positioning function and the holding stability are not impaired. It may be a fitting with a minute gap. In this example, the fitting is performed with such a gap so that the small pad 14 can be easily inserted into the fitting recess 32 and the positioning function and the holding stability are exhibited. Yes.

  When the small pad 14 is attached to the mold 20, the protrusion 28 and the groove 30 are engaged with each other as shown in FIGS. 3 to 5 with the upper mold 24 opened as shown in FIG. The small pad 14 is held by the upper mold 24. Specifically, the longitudinal ends 30E and 30E of the concave groove 30 opened on the both side surfaces 14B and 14C of the small pad 14 are used as marks, and the both ends coincide with the longitudinal ends 28E and 28E of the ridge 28. In this way, the small pad 14 is pressed against the mold surface. Thereby, the small pad 14 made of an elastic material is elastically deformed around the concave groove 30, so that the convex stripe 28 enters the concave groove 30, and thereby the convex stripe 28 and the concave groove 30 are fitted. In this example, since the fitting recess 32 is further provided, by fitting the small pad 14 into the fitting recess 32, the ridge 28 and the groove 30 are fitted, and the small pad 14 is The mold 24 is held.

  After attaching the small pad 14 to the upper mold 24 in this way, a polyurethane foam raw material is injected into the lower mold 22 from an unillustrated injection device, and the mold 20 is closed by closing the upper mold 24. The pad main body 12 is foam-molded in the cavity. Thereby, the small pad 14 is integrated with the pad main body 12.

  Thereafter, the upper die 24 is opened and removed to obtain the seat pad 10. In the thus obtained seat pad 10, the small pad 14 is embedded with the mounting surface 14 </ b> A exposed on the back surface of the seat pad 10, so that the recessed groove 30 is exposed on the back surface of the pad. Because it is on the back side, it has no effect on the appearance of the sheet.

  In the present embodiment as described above, the concave grooves 30 of the small pad 14 are fitted to the ridges 28 of the upper mold 24 so that the small pad 14 is held by the molding die 20. With the holding effect by the shape itself and the holding effect by the concave and convex fitting extending linearly by the ridge 28 and the groove 30, even if it does not protrude greatly from the inner surface of the mold like the conventional pin, the sufficient holding effect Can be demonstrated. Therefore, it is possible to eliminate damage such as tearing of the seat pad 10 when the upper die 24 is opened or when the seat pad 10 is removed while improving the workability of attaching the small pad 14 to the mold 20.

  In addition, since the protrusion for holding the small pad 14 is not a conventional pin but a ridge 28 having a predetermined length, when a release agent is applied to the inner surface of the mold 20 by spraying or the like. In addition, it is easy to apply a release agent to the side surfaces of the ridges 28, and therefore good demolding properties can be obtained.

  Further, since the concave groove 30 is formed by opening the both side surfaces 14B and 14C of the small pad 14 across the attachment surface 14A of the small pad 14, the both ends 30E and 30E of the concave groove 30 are formed at both ends of the convex line 28. By matching with 28E and 28E, the alignment when fitting the ridge 28 and the groove 30 is easy, and the mounting workability is excellent. In addition, when the shape of the concave groove 30 is open on both side surfaces 14B and 14C, it is easy to form the concave groove 30 by punching from a rectangular parallelepiped chip urethane.

  Further, by providing the fitting recess 32 on the inner surface of the upper mold 24, the protrusion 28 and the groove 30 can be easily fitted by fitting the small pad 14 into the fitting recess 32. In addition, the positioning of the small pad 14 with respect to the inner surface of the upper mold 24 can be facilitated, and the holding performance of the small pad 14 with respect to the upper mold 24 can be enhanced. That is, the small pad 14 is held more stably by being fitted and held by the ridge 28 and the concave groove 30 and the end of the small pad 14 being received in the fitted state by the fitting recess 32 around it. can do.

  In the above-described embodiment, the cross-sectional shape of the ridge 28 is formed in a reverse taper shape. However, the present invention is not limited to this, as long as it has a cross-sectional shape in which the tip 28B side is enlarged with respect to the base portion 28A. As shown in FIG. 6, the ridges 28 that swell in a circular cross section may be provided, and the concave grooves 30 that fit into the ridges 28 may be provided in a circular cross section. In addition, various cross-sectional shapes can be taken.

  Moreover, in the said embodiment, although the cross-sectional shape of the protruding item | line 28 and the ditch | groove 30 was made into the same shape, as long as both fit, it does not need to be the exact same shape. For example, as shown in FIG. 7, when one recess 28 is provided on one side surface 28S of the protrusion 28 and the protrusion 28 and the groove 30 are fitted as shown in FIG. Between the side surface 28 </ b> S and the side surface 30 </ b> S of the recessed groove 30, a gap 38 due to the recess 36 may be formed.

  More specifically, in FIG. 7, the ridge 28 is based on the reverse taper cross-sectional shape extending from the base 28 </ b> A toward the tip 28 </ b> B, and is on the base 28 </ b> A side on one side surface 28 </ b> S of the ridge 28. Has a recess 36. The dent 36 is provided only on one side surface 28S of the upper and lower side surfaces of the ridge 28, and is formed in a cutout shape having a triangular section that gradually becomes deeper from the base portion 28A toward the tip 28B side. It is provided over the entire length. On the other hand, the concave groove 30 is not changed from the above-described embodiment, that is, the reverse groove that extends from the attachment surface 14A on the opening side toward the back side in correspondence with the reverse tapered cross-sectional shape that is the basis of the ridge 28. It is formed in a tapered (reverse trapezoidal) cross-sectional shape. Then, as shown in FIG. 8, when the ridge 28 and the groove 30 are fitted, a gap 38 due to the dent 36 is provided between one side surface 28 </ b> S of the ridge 28 and the side surface 30 </ b> S of the groove 30. Is secured.

  Thus, by providing the dent 36 in one direction of the ridge 28, the ridge 28 can be hardly caught when the seat pad 10 is removed. That is, when the small pad 14 moves in the direction indicated by the arrow X (see FIG. 8) during demolding, the corner 30A (see FIG. 7) on the opening side of the recessed groove 30 enters the recess 36. Thus, the rotation of the small pad 14 in the X direction is facilitated (that is, the recess 36 serves as a relief portion of the corner portion 30A during the rotation), and the fitting of the protrusion 28 and the groove 30 can be easily released, It becomes easy to remove the seat pad 10.

  Moreover, in the said embodiment, although the small pad 14 was attached to the upper mold | type 24, if the attachment position of the small pad 14 is an inner surface of the shaping | molding die 20, it can attach to various positions, and it is not specifically limited. For example, as shown in FIG. 9, it may be attached to the side surface 22 </ b> A of the lower mold 22. In this case, in particular, when the small pad 14 is attached to the lower mold side surface 22A located on the side opposite to the hinge 26, in consideration of the demolding property, the ridge 28 is formed on the lower mold side surface as shown in FIG. In 22A, it is preferable that the protrusion 28 is formed so that the longitudinal direction thereof extends in the vertical direction, that is, in the vertical direction.

  In the above embodiment, the small pad 14 is embedded in the back side of the side portion of the seat pad 10. However, in the present invention, the embedded position of the small pad 14 is not particularly limited. Can be embedded in any part. Further, in the above embodiment, only one concave groove 30 is provided in each small pad 14, but two or more concave grooves 30 may be provided in one small pad 14, and there is no particular limitation. Moreover, 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. Furthermore, the seat is not limited to a three-seat rear seat, and can naturally be applied to, for example, a one-seat front seat. Although not enumerated one by one, various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Seat pad 12 ... Pad main body 14 ... Small pad, 14A ... Mounting surface, 14B, 14C ... Side surface 20 ... Mold 28 ... Convex strip, 28A ... Base part, 28B ... Tip, 28E ... Longitudinal end, 28S ... One side surface 30 ... concave groove, 30E ... longitudinal end, 30S ... side surface 32 ... fitting recess 36 ... concave, 38 ... gap

Claims (4)

In a method of manufacturing a seat pad in which the small pad is integrated with the pad body by holding a small pad on the inner surface of the mold and supplying the foaming stock solution into the mold and foaming.
A convex strip having a cross-sectional shape with an enlarged front end side is provided on the inner surface of the mold, and a concave groove for fitting the convex strip is provided on a mounting surface of the small pad with respect to the mold. A manufacturing method for fitting the groove and the concave groove to hold the small pad on the mold , wherein the concave groove is crossed across the mounting surface of the small pad at both ends in the longitudinal direction of the small pad. The seat pad is characterized by being formed in a groove shape opened on both side surfaces, and fitting the convex groove and the concave groove so that both ends of the concave groove coincide with both ends in the longitudinal direction of the convex stripe . Production method. In a method of manufacturing a seat pad in which the small pad is integrated with the pad body by holding a small pad on the inner surface of the mold and supplying the foaming stock solution into the mold and foaming.
A convex strip having a cross-sectional shape with an enlarged front end side is provided on the inner surface of the mold, and a concave groove for fitting the convex strip is provided on a mounting surface of the small pad with respect to the mold. A manufacturing method for fitting a strip and the concave groove to hold the small pad in the mold , wherein a concave is provided on one side surface of the convex strip, and the convex strip and the concave groove are fitted. A method of manufacturing a seat pad , wherein a gap due to the dent is formed between one side surface of the ridge and the side surface of the concave groove .   The method of manufacturing a seat pad according to claim 1 or 2, wherein the cross-sectional shape of the ridges has an inverse taper shape extending from the base of the ridges toward the tip. A fitting recess for receiving an end of the small pad on the mounting surface side is provided on the inner surface of the mold, and the protrusion and the groove are formed by fitting the small pad into the fitting recess. The seat pad manufacturing method according to any one of claims 1 to 3 , wherein the small pad is held in the mold by fitting.

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