JP2014061073A - Back pad for seat, and molding die therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back pad for a seat with backboard specifications, improving the exterior appearance of a backrest part of the seat, especially the exterior appearance of a periphery of a back board by hardly causing molding failure.SOLUTION: A back pad for a seat constitutes a backrest part of a vehicle seat provided with an inward overhang part on a back side of a pad body formed of soft foam and including a backboard at the back. A flange part 20 extended toward the inside of the pad body in the overhang part includes: a thick part; a thin part 26 caving in forward to be thin for receiving an edge part of the backboard at the forward end side of the thick part 22; and a step part 24 provided between the thick part 22 and the thin part 26. A projection 40 formed by a recessed part 65 provided on a molding die surface 62 forming the step part 24 in the molding die and air K accumulated in the recessed part 65 is formed on the step part 24.

Description

  The present invention relates to a seat back pad used in automobiles and the like, and a mold for molding the seat back pad.

  In general, a back pad used as a cushioning material in a backrest portion of a vehicle seat is made of a molded product of foamed resin such as flexible polyurethane foam, and is assembled to a metal frame and covered with a skin material. And it is comprised as a backrest part of the vehicle seat. In order to hold the frame, the seat back pad is integrally provided with an inwardly extending portion on the back side of the pad main body.

  When a backboard such as a resin panel is provided on the back of the backrest to give a high-quality appearance to the backrest or to add functions such as a table sheet to the back of the backrest There is.

  FIG. 7 shows an example in which a backboard 2 is provided on the back of a backrest 1 in a front seat of an automobile, and a skin material 3 is covered on the back pad.

  In the back pad of the back board specification as described above, as shown in FIG. 8, the front end portion of the flange portion 102 in the protruding portion 101 of the back pad 100 is thin so as to receive the edge portion 2A of the back board 2. The flange portion 102 is formed by the thick portion 103 and the thin portion 104. When the back pad 100 having such a flange portion 102 is subjected to foam molding using a foam molding die, the parting line PL of the molding die is lower than the top of the thick portion 103, so that the outer surface of the thick portion 103 is formed. Air accumulation tends to occur, and defects caused thereby cause poor appearance (see, for example, Patent Document 1 below).

  As a measure for making it difficult for air accumulation to occur, the step G between the thick wall portion 103 and the thin wall portion 104 is reduced, or the apex of the thick wall portion 103 is directed toward the parting line PL as shown in FIG. It is conceivable to provide a slit groove 106 for releasing foaming gas (for example, see Patent Document 2 below). However, in these measures, the backboard 2 cannot be disposed in the thin portion 104 of the flange portion 102, and the appearance with a high-class feeling is impaired.

JP 2011-115495 A JP 2007-253397 A

  The present invention has been made in view of the above points, and in the back pad for seats of the back board specification, it is difficult to cause molding defects and improves the appearance of the back portion of the seat, particularly the appearance around the back board. With the goal.

  The seat back pad according to the present invention is formed by integrally foam-molding a pad main body made of a flexible foam and an inward projecting portion provided on the back side of the pad main body with a molding die. A back pad for a seat that constitutes a backrest portion of a vehicle seat comprising: the overhanging portion extending backward from the pad main body, and the connecting portion spaced apart from the back surface of the pad main body. A flange portion extending toward the inside of the pad main body, and the flange portion includes a thick portion provided on the connecting portion side, and a front end side of the thick portion. A thin wall portion that falls forward to receive an edge portion and is provided thinner than the thick wall portion; and a step portion provided between the thick wall portion and the thin wall portion. Wherein the protrusions are formed by serial provided in the mold surface forming the step portion recess and the air accumulated in the recess is formed on the stepped portion.

  Further, the sheet back pad molding die according to the present invention includes a pad body made of a flexible foam, and an inward projecting portion integrally provided on the back side of the pad body, A connecting portion extending rearward from the pad main body, and a flange portion extending from the connecting portion toward the inside of the pad main body with a gap from the back surface of the pad main body, the flange portion being A thick part provided on the connecting part side, and a thin part provided on the front end side of the thick part so as to receive the edge of the backboard so as to be thinner than the thick part, A seat back pad for foam-molding a seat back pad comprising a backrest portion of a vehicle seat having a step portion provided between the thick portion and the thin portion and having a back board on the back surface. In the molding die, a lower die recessed so as to mold the front side of the pad main body, an upper die for molding the outer surface of the flange portion, and a back surface of the pad main body and an inner surface of the overhanging portion are being molded. The upper die is provided with a concave portion that is recessed outwardly on a die surface that molds the stepped portion in the upper die.

  According to the present invention, the step portion provided between the thick portion and the thin portion in the flange portion is formed by the concave portion provided in the mold surface forming the step portion in the molding die and the air accumulated in the concave portion. Since the formed protrusions are formed, air accumulation is less likely to occur on the outer surface of the thick wall portion, the pad surface can be prevented from being damaged, molding defects can be suppressed, and the finished appearance of the sheet can be improved.

It is a perspective view of the back side of the back pad for sheets concerning one embodiment of the present invention. It is the sectional view on the AA line of FIG. FIG. 2 is a rear view of the seat back pad shown in FIG. 1. It is a principal part enlarged view of the BB line cross section of FIG. It is sectional drawing of the foaming mold for shape | molding the sheet | seat back pad shown in FIG. It is sectional drawing to which the principal part of FIG. 5 was expanded. It is a perspective view of a seat back part with a back board. Sectional drawing equivalent to CC line of FIG. It is a principal part expanded sectional view of the back pad at the time of providing a slit groove | channel as a countermeasure against air accumulation.

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

  The back pad 10 of the embodiment shown in FIGS. 1 and 2 is a pad used as a cushion material in a backrest portion of a front seat of an automobile, for example. The back pad 10 includes a pad main body 12 made of a flexible foam such as a flexible polyurethane foam, and a reinforcing cloth 14 laminated and integrated on the back side thereof, and woven or knitted fabric or leather is sewn together. The surface is covered with the skin material 3 (see FIG. 7), assembled to the frame 4 (see FIG. 4), and the backboard 2 made of resin (see FIG. 7) is attached to the back side, thereby forming a backrest portion. To do.

  An inward flange-like overhanging portion 16 for mounting the frame 4 is integrally provided on the upper side portion and the left and right side portions on the back side of the pad main body 12. The overhanging portion 16 extends from the pad main body 12 so as to protrude rearward Z1, and the back of the pad main body 12 is spaced a predetermined distance L from the connecting portion 18 toward the inside of the pad main body 12. And a flange portion 20 extending inwardly. The back pad 10 composed of the pad main body 12 and the flange portion 20 has a bag shape having an opening 21 on the back surface.

  As shown in an enlarged view in FIG. 4, the flange portion 20 is formed on the thick portion 22 on the connecting portion 18 side, and is formed on the thin portion 26 on the front end side via the step portion 24.

  Specifically, the flange portion 20 is formed in a concave shape in which the outer surface of the thin wall portion 26 falls into the front Z2 so that the thin wall portion 26 provided at the tip of the flange portion 20 contacts and accepts the edge portion 2A of the backboard 2. As a result, the tip of the flange portion 20 is formed thinner than the thick portion 22. The thick portion 22 projecting to the rear Z1 on the connecting portion 18 side of the flange portion 20 and the thin portion 26 recessed to the front Z2 on the distal end side of the flange portion 20 are stepped portions formed of inclined surfaces with rounded corners. 24 are gently connected.

  On the inclined surface of the stepped portion 24, a protrusion 40 protruding in the normal direction is provided along the direction in which the stepped portion 24 extends (that is, along the edge of the opening 21 formed inside the flange portion 20). And a plurality of them are provided at predetermined intervals. The protrusion 40 has a flat cylindrical shape, and a recessed portion 42 that is recessed toward the stepped portion 24 is formed at a tip portion thereof. The protrusion 40 is formed by a recess 65 provided in a mold surface 62 for forming the stepped portion 24 in a foaming mold 50 to be described later, and a recess 42 is formed at the tip of the protrusion 40 by the air K accumulated in the recess 65. Formed (see FIGS. 3, 4 and 6).

  The thick wall portion 22 has a protruding amount to the rear Z1 so that the back board 2 is assembled so as to cover the thin wall portion 26 so that the thick wall portion 22 is equivalent to the back pad 10 or protrudes rearward from the rear Z1. It is set, and this enhances the design effect.

  The reinforcing cloth 14 is sewn in a bag shape, and is integrated by foam molding of the flexible polyurethane foam so as to cover the back surface of the pad main body 12 and the inner surface of the overhanging portion 16. The reinforcing cloth 14 can be used without particular limitation as long as it has appropriate air permeability and can prevent the polyurethane foam from oozing out during foam molding, and can be used without any limitation. A complex or the like can be used.

  As shown in FIG. 5, the foam mold 50 for molding the back pad 10 molds the lower mold 52 that is recessed so as to mold the front side of the pad body 12 and the outer surface of the flange portion 20. An upper die 54 and a core die 56 for molding the back surface of the pad main body 12 and the inner surfaces of the connecting portion 18 and the flange portion 20 are provided.

  The upper die 54 is provided so as to be rotatable with respect to the lower die 52 via a hinge 58, and is configured to open and close the upper surface opening of the lower die 52. As shown in FIG. 6, the mold surface 62 for molding the stepped portion 24 of the flange portion 20 in the upper mold 54 is provided with a recess 65 that is recessed outward (that is, in the normal direction of the mold surface). Yes. In this example, the recess 65 has a flat cylindrical shape with a diameter of 8 mm and a depth of about 5 mm, and is provided in a mortar shape in which the bottom of the recess 65 is deeply depressed toward the center. Such a recess 65 is formed by cutting with a drill or the like on the mold surface 62 for forming the stepped portion 24 in the upper mold 54, and is provided along the direction in which the stepped portion 24 extends (that is, on the back surface of the back pad 10). A plurality are provided at predetermined intervals (along the edge of the opening 21).

  The core die 56 is detachably provided from the upper die 54 by a driving device 60 provided on the upper die 54.

  In order to manufacture the back pad 10 using the foaming mold 50, first, the reinforcing cloth 14 previously sewn in a bag shape is placed on the core mold 56 and fixed by a pin (not shown) or the like.

  Next, after the foamed resin stock solution 70 is injected into the lower mold 52 using an injection device (not shown), the upper mold 54 and the core mold 56 are closed with respect to the lower mold 52 as shown in FIG. Thereby, the foamed resin stock solution 70 fills the cavity 64 of the foam molding die 50 while foaming.

  Specifically, the foamed resin stock solution 70 injected into the lower mold 52 is made to wrap around the tip of the core mold 56 from the pad body 12 side formed between the lower mold 52 and the core mold 56. Then, it flows into the flange portion 20 side between the upper mold 54 and the core mold 56.

  The foamed resin stock solution 70 that has flowed into the flange portion 20 side is filled from the thick portion 22 through the step portion 24 to the thin portion 26 toward the tip of the flange portion 20. At that time, since the parting line PL formed between the upper mold 54 and the core mold 56 in the foaming mold 50 is located at a position lower than the top of the thick portion 22, the air generated by the foaming gas is separated from the parting line. A recess 65 that is recessed outward is formed in the mold surface 62 for forming the stepped portion 24 in the upper mold 54 even if it is not sufficiently discharged from the PL to the outside and partially remains inside the cavity 64. Since the air K remaining in 64 is preferentially collected in the recess 65, the projection 40 having the recess 42 at the tip is formed by the recess 65 provided in the mold surface 62 and the air K accumulated in the recess 65. 24.

  In the present embodiment, since the bottom of the recess 65 has a mortar shape that sinks deeper toward the center, the air K that has entered the recess 65 is less likely to leak from the recess 65 and easily stay in the recess 65.

  After foaming the back pad 10 in this way, the upper die 54 is opened, and the core die 56 is detached from the upper die 54 by the driving device 60, and then the back pad 10 is removed, whereby the back pad 10 is removed. 10 is obtained.

  In the present embodiment as described above, the concave portion 65 that is recessed outward from the cavity 64 is formed in the mold surface 62 that molds the step portion 24 that connects the thick portion 22 and the thin portion 26 in the upper die 54. The air K remaining in the cavity 64 preferentially accumulates in the recess 65, and the air hardly remains in the thick portion 22 or the thin portion 26. Therefore, a protrusion 40 having a recessed portion 42 at the tip is formed in the stepped portion 24 by the recessed portion 65 provided in the mold surface 62 and the air K accumulated in the recessed portion 65, and the thick portion 22 and the thin portion 26 are formed. Insufficient meat loss.

  Further, since the protrusion 40 formed on the stepped portion 24 has a flat shape with a small height dimension, when the surface is covered with the skin material 3, it is difficult to appear as irregularities on the outer surface, and the backboard 2 If the edge portion 2A is attached to the flange portion 20 so as to abut on the thin portion 26, the backboard 2 becomes less conspicuous depending on the thickness, so that the finished appearance of the sheet can be improved.

  Further, since the protrusion 40 is provided only on the stepped portion 24 of the flange portion 20 and is not provided on the thick portion 22 or the thin portion 26, the protrusion 40 interferes when attaching the backboard 2 to the back surface of the back pad 10. There is nothing.

  Moreover, although the said embodiment demonstrated the example which provided the backboard for providing the appearance with a high-class feeling to the backrest part, for example, the backboard for providing functions, such as a table seat, to the back surface of a backrest part The present invention can also be applied to a back pad having specifications including the above. Although not enumerated one by one, various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Backrest part 2 ... Back board 2A ... Edge part 3 ... Skin material 4 ... Frame 10 ... Seat back pad 10 ... Back pad 12 ... Pad main body 14 ... Reinforcement cloth 16 ... Overhang part 18 ... Connection part 20 ... Flange part 21 ... Opening part 22 ... Thick part 24 ... Step part 26 ... Thin part 40 ... Protrusion 42 ... Depression part 50 ... Foaming mold 52 ... Lower mold 54 ... Upper mold 56 ... Core mold 58 ... Hinge 60 ... Drive device 62 ... Mold surface 64 ... Cavity 65 ... Recess 70 ... Foamed resin stock solution K ... Air PL ... Parting line

Claims (3)

A pad main body made of a flexible foam and an inward projecting portion provided on the back side of the pad main body are integrally foam-molded with a molding die, and a backrest portion of a vehicle seat having a backboard on the back surface. In the seat back pad to be configured,
The projecting portion includes a connecting portion extending rearward from the pad main body, and a flange portion extending from the connecting portion toward the inside of the pad main body with a gap from the back surface of the pad main body. Prepared,
The flange portion is provided to be thinner than the thick portion by dropping forward to receive the edge portion of the backboard on the thick portion provided on the connecting portion side and the leading end side of the thick portion. A thin portion, and a step portion provided between the thick portion and the thin portion,
A back pad for a sheet, wherein a projection formed by a concave portion provided on a mold surface forming the step portion in the molding die and air accumulated in the concave portion is formed on the step portion.   2. The seat back pad according to claim 1, wherein a plurality of the protrusions are formed at intervals along an edge of an opening formed inward of the flange portion. A pad body made of flexible foam, and an inward projecting portion integrally provided on the back side of the pad body,
The projecting portion includes a connecting portion extending rearward from the pad main body, and a flange portion extending from the connecting portion toward the inside of the pad main body with a gap from the back surface of the pad main body. Prepared,
The flange portion is provided to be thinner than the thick portion by dropping forward to receive the edge portion of the backboard on the thick portion provided on the connecting portion side and the leading end side of the thick portion. A thin portion, and a step portion provided between the thick portion and the thin portion,
In the mold of the seat back pad for foam molding of the seat back pad constituting the backrest portion of the vehicle seat having a back board on the back surface,
A lower mold that is recessed so as to mold the front side of the pad main body, an upper mold that molds the outer surface of the flange portion, and a core mold that molds the back surface of the pad main body and the inner surface of the overhanging portion. Prepared,
A mold for forming a back pad for a sheet, wherein a concave portion that is recessed outward is provided on a mold surface for molding the stepped portion in the upper mold.

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