WO2014054299A1 - Back pad for seat and manufacturing method therefor - Google Patents

Back pad for seat and manufacturing method therefor Download PDF

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Publication number
WO2014054299A1
WO2014054299A1 PCT/JP2013/005941 JP2013005941W WO2014054299A1 WO 2014054299 A1 WO2014054299 A1 WO 2014054299A1 JP 2013005941 W JP2013005941 W JP 2013005941W WO 2014054299 A1 WO2014054299 A1 WO 2014054299A1
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WO
WIPO (PCT)
Prior art keywords
mold
pad
connecting portion
back pad
main body
Prior art date
Application number
PCT/JP2013/005941
Other languages
French (fr)
Japanese (ja)
Inventor
史裕 小島
Original Assignee
東洋ゴム工業株式会社
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Application filed by 東洋ゴム工業株式会社 filed Critical 東洋ゴム工業株式会社
Priority to CN201380002256.XA priority Critical patent/CN104039592A/en
Publication of WO2014054299A1 publication Critical patent/WO2014054299A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/64—Back-rests or cushions
    • B60N2/643—Back-rests or cushions shape of the back-rests
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/68—Seat frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/14—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/80—Head-rests
    • B60N2/897—Head-rests with sleeves located in the back-rest for guiding the rods of the head-rest

Definitions

  • the present invention relates to a seat back pad used in automobiles and the like, and a method of manufacturing the seat back pad.
  • 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.
  • a seat back pad has an inward projecting structure comprising a connecting portion extending rearward from the upper side of the pad main body and a flange portion extending downward from the connecting portion with a distance from the rear surface of the pad main body.
  • the part is provided integrally and has a bag shape opened on the back surface, and the frame is held between the pad main body and the overhanging part.
  • the pad body corresponding to the surface side of the back pad and the lower mold for molding the outer surface of the connecting portion, the core mold for molding the inner surface of the pad body and the overhanging portion, and the core mold Is a three-part mold having an upper mold that can be closed to the lower mold.
  • the foamed resin stock solution is injected into the lower mold, and the upper mold is closed to the lower mold together with the core mold to perform the foam molding.
  • a through hole penetrating up and down the connecting portion may be formed (for example, Patent Document 1 below).
  • a columnar part is provided between the lower mold surface and the core mold surface for forming the connecting part to form a through hole in the connecting part.
  • the foamed resin stock solution injected into the lower mold flows into the connecting part and the flange part sequentially around the tip of the core mold. Therefore, there is a problem that the liquid flow is likely to be hindered by the columnar portion, and a molding defect such as lacking is likely to occur around the through hole of the molded back pad.
  • the foamed resin stock solution flowing in the mold is divided in the width direction of the connecting portion by the columnar part and merges behind the columnar part (that is, downstream in the flow direction of the foamed resin stock solution).
  • An air pocket that does not allow liquid to flow into is formed between the merging portion and the columnar portion, and as a result, there is a lack of thickness around the through hole of the back pad, particularly at the rear edge of the through hole corresponding to the back side of the columnar portion.
  • the through hole of the back pad particularly at the rear edge of the through hole corresponding to the back side of the columnar portion.
  • the present invention has been made in view of the above points, and is provided with a back pad for a seat that can be provided with a through-hole while securing formability in a connecting portion that extends backward from the upper side of the pad main body, and It aims at providing the manufacturing method.
  • the seat back pad according to the present invention includes a pad main body made of a flexible foam, a connecting portion extending rearward from the pad main body, and extending downward from the connecting portion with a gap from the back surface of the pad main body.
  • the flange portion and the through hole penetrating the connecting portion up and down are depressed downward from the upper surface of the connecting portion, and from the peripheral portion of the through hole.
  • a concave groove extending to one side in the width direction of the connecting portion is provided.
  • annular protrusion protruding upward may be provided at a peripheral edge of the through hole, and the concave groove may be extended from the outside of the annular protrusion.
  • the manufacturing method of the seat back pad according to the present invention includes a pad main body made of flexible foam, a connecting portion extending rearward from the upper side of the pad main body, and a back surface of the pad main body.
  • the sheet back pad including the flange portion extending downward from the connection portion and the through hole penetrating the connection portion up and down is foam-molded with a forming die.
  • the mold includes: a lower mold that molds the outer surface of the pad body and the connecting portion; an upper mold that molds the outer surface of the flange portion; a core mold that molds the inner surfaces of the connecting portion and the flange portion; A columnar part for forming the through hole provided between a mold surface for forming the outer surface of the connecting part in the mold and a mold surface for forming the inner surface of the connecting part in the core mold, and the connection in the lower mold And a protruding line extending from the side of the columnar part to one side in the width direction of the connecting part on the mold surface for molding the outer surface of the resin, and injecting a foamed resin stock solution into the lower mold, A sheet back pad is formed by closing the mold with respect to the lower mold.
  • FIG. 2 is a rear view of the seat back pad shown in FIG. 1.
  • FIG. 3 is an enlarged view of a main part of a cross section taken along line AA in FIG. 2. It is sectional drawing of the foaming mold which shape
  • FIG. 6 is a sectional view taken along line BB of FIG.
  • FIG. 7 is a cross-sectional view taken along the line CC of FIG.
  • the back pad 10 of the embodiment shown in FIGS. 1 and 2 is a seat back 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 a skin material (not shown) and assembled to the frame 4 (see FIG. 3) to constitute a backrest portion.
  • An inward flange-like overhanging portion 16 for mounting the frame 4 is integrally provided on the upper side portion on the back side of the pad main body 12.
  • the overhanging portion 16 extends inward from the pad main body 12 toward the inside of the pad main body 12 with a predetermined distance from the connecting portion 18 extending so as to protrude rearward Z from the pad main body 12.
  • a flange portion 20 extending in the direction, and is formed in a bag shape that opens downward together with the pad main body 12.
  • the connecting portion 18 constitutes the upper portion of the back pad 10 and is formed with a recessed portion 30 that is recessed downward so that the lower portion of the headrest 28 (see FIG. 2) is fitted in the center portion in the width direction.
  • the width direction of the connecting portion 18 (that is, the left-right direction) is such that a through hole 32 for inserting a mounting bracket 28a provided in the headrest 28 penetrates the connecting portion 18 up and down.
  • a plurality of locations (two locations in this example) are provided at intervals.
  • An annular protrusion 34 protruding upward from the bottom 30 a of the recessed portion 30 is provided at the peripheral edge of the through hole 32 so as to surround the through hole 32.
  • a concave groove 36 that is recessed downward from the bottom 30a is provided in the bottom 30a of the concave 30.
  • the concave groove 36 is provided only on one side W1 in the left-right direction with respect to one through hole 32, and is not provided on the other side W2 in the left-right direction. It extends from the outside of the portion 34 in one direction W1 in the left-right direction (that is, outward of the annular protrusion 34).
  • the depth of the concave groove 36 can be set in a range of 20 to 80% of the thickness of the connecting portion 18 where the concave groove 36 is formed.
  • a concave groove 36 extends to the left from the left side of the annular protrusion 34 provided at the peripheral edge of the left through hole 32 when the back pad 10 is viewed from the front.
  • the case where the groove 36 extends rightward from the right side of the annular protrusion 34 provided at the peripheral edge of the right through hole 32 when the back pad 10 is viewed from the front will be described.
  • the concave groove 36 may extend from the right side of the annular protrusion 34 of the through hole 32 to the right, or the concave groove 36 may extend from the left side of the annular protrusion 34 of the right through hole 32 to the left.
  • the flange portion 20 is formed with a thick portion 22 on the connecting portion 18 side, and a thin portion 26 is formed on the tip side with respect to the thick portion 22 via a step portion 24.
  • 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.
  • the foam mold 50 for molding the back pad 10 includes a lower mold 52 that molds the outer surfaces of the pad body 12 and the connecting portion 18, and an upper mold 54 that molds the outer surface of the flange portion 20. And a core die 56 for molding the inner surfaces of the connecting portion 18 and the flange portion 20.
  • 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.
  • a core die 56 is disposed below the upper die 54.
  • the core mold 56 is detachably provided from the upper mold 54 by a driving device 60 provided on the upper mold 54.
  • the columnar portion 62 is a first portion that protrudes from a mold surface 52 a that molds the outer surface of the connecting portion 18 in the lower mold 52 toward a core mold 56 that faces the mold surface 52 a.
  • the convex portion 68 and the second convex portion 70 that protrudes from the mold surface 56a that molds the inner surface of the connecting portion 18 in the core mold 56 toward the mold surface 52a of the lower mold 52 that faces the mold surface 56a. It is composed of that.
  • the annular recess 64 is recessed from the mold surface 52 a of the lower mold 52 toward the outside of the cavity 59 so as to surround the first protrusion 68.
  • the ridge 66 has a flat plate shape protruding from the mold surface 52a of the lower mold 52 toward the mold surface 56a of the core mold 56 facing the mold surface 52a. Is set to a range of 20 to 80% of the distance between the mold surface 52a and the mold surface 56a of the core mold 56.
  • the ridge 66 extends from an annular recess 64 provided at the peripheral edge of the first projection 68 to one side W1 of the back pad 10 in the left-right direction.
  • the protrusion 66 is provided only on one side W1 in the left-right direction of the back pad 10 with respect to one first protrusion 68 (columnar part 62), and on one side W1 in the left-right direction of the columnar part 62,
  • the space between the mold surface 52a of the lower mold 52 and the mold surface 56a of the core mold 56 is narrowed to prevent the flow of the foamed resin flowing from the bottom surface side of the lower mold 52 upward X.
  • 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.
  • the foamed resin stock solution 80 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. As a result, the foamed resin stock solution 80 fills the cavity 59 of the foam molding die 50 while foaming.
  • the foamed resin stock solution 80 injected into the lower mold 52 is moved from the pad main body 12 side formed between the lower mold 52 and the core mold 56 toward the upper X, and the tip of the core mold 56 ( That is, it flows so as to wrap around the mold surface 56 a) of the core mold 56.
  • the mold surface 52a of the lower mold 52 opposite to the mold surface 56a of the core mold 56 is projected from the peripheral edge of the first projection 68 only to one side W1 in the left-right direction.
  • 66 protrudes and the flow of the foamed resin is obstructed on one side W ⁇ b> 1 of the columnar part 62 in the left-right direction. Therefore, the foamed resin flowing at the tip of the core mold 56 is divided in the left-right direction W by the columnar part 62. However, more foamed resin flows on the other side W2 than on the one side W1 of the columnar portion 62 in the left-right direction.
  • the foamed resin that has flowed through the other side W2 in the left-right direction flows behind the columnar part 62 (downstream in the flow direction of the foamed resin) and flows into the one side W1, and the ridge 66 is provided.
  • the foamed resin divided in the left-right direction W by the columnar portion 62 joins.
  • the foamed resin that flows between the lower mold 52 and the core mold 56 flows into the flange portion 20 side between the upper mold 54 and the core mold 56 to mold the back pad 10.
  • 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.
  • the lower mold 52 extends from the peripheral portion of the columnar portion 62 for forming the through hole 32 in the mold surface 52a for molding the outer surface of the connecting portion 18 to the one side W1 in the left-right direction.
  • the foamed resin divided in the left-right direction W by the columnar part 62 is merged at the position P near the one side W1 in the left-right direction from the back of the columnar part 62. It is difficult to form an air pocket that does not flow in, and it is difficult for a lack of thickness or the like to occur in the peripheral portion of the through hole 32.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Seats For Vehicles (AREA)
  • Molding Of Porous Articles (AREA)

Abstract

This back pad (10) for a seat is formed by integrally foam molding, in a forming mold (50), a pad body (12) made of a flexible foam, a connection section (18) which extends rearward from the pad body (12), a flange section (20) which extends downward from the connection section (18) spaced away from the back of the pad body (12), and through-holes (32) which vertically penetrate the connection section (18). The back pad (10) is equipped with grooves (36) which are recessed downward from the upper surface of the connection section (18) and each extends in one direction (W1) in the width direction of the connection section (18) from the periphery of a through-hole (32). As a result, through-holes can be created in the connection section, which extends rearward from an upper side part of the pad body, without compromising moldability.

Description

シート用バックパッド及びその製造方法Seat back pad and manufacturing method thereof
　本発明は、自動車などに使用されるシート用バックパッド及びそのシート用バックパッドを製造する方法に関するものである。 The present invention relates to a seat back pad used in automobiles and the like, and a method of manufacturing the seat back pad.
　一般に、車両用シートの背もたれ部においてクッション材として用いられるバックパッドは、軟質ポリウレタンフォームなどの発泡樹脂の型成形品からなり、これを金属製のフレームに組み付けるとともに、パッド表面に表皮材を被せる等して、車両用シートの背もたれ部として構成されている。かかるシート用バックパッドは、パッド本体の上辺部から後方に延設された連結部と、パッド本体の背面と間隔をあけて連結部から下方へ延設されたフランジ部とからなる内向きの張り出し部が一体に設けられ、背面に開口した袋状をなしており、パッド本体と張り出し部との間で上記のフレームを保持している。 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. Such a seat back pad has an inward projecting structure comprising a connecting portion extending rearward from the upper side of the pad main body and a flange portion extending downward from the connecting portion with a distance from the rear surface of the pad main body. The part is provided integrally and has a bag shape opened on the back surface, and the frame is held between the pad main body and the overhanging part.
　上記のバックパッドを発泡成形する場合、バックパッドの表面側に相当するパッド本体及び連結部の外面を成形する下型と、パッド本体及び張り出し部の内面を成形する中子型と、中子型が一体に設けられ下型に閉合可能な上型と、よりなる３ツ割タイプの成形型が用いられる。そして、発泡成形に際しては、下型に発泡樹脂原液を注入し、上型を中子型とともに下型に型閉めして発泡成形を行っている。 When foaming the back pad, the pad body corresponding to the surface side of the back pad and the lower mold for molding the outer surface of the connecting portion, the core mold for molding the inner surface of the pad body and the overhanging portion, and the core mold Is a three-part mold having an upper mold that can be closed to the lower mold. In the foam molding, the foamed resin stock solution is injected into the lower mold, and the upper mold is closed to the lower mold together with the core mold to perform the foam molding.
　ところで、バックパッドでは、別部材からなるヘッドレストを取り付けるため、連結部を上下に貫通する貫通孔が形成されることがある（例えば、下記特許文献１）。このような貫通孔を備えたバックパッドを発泡成形する場合、連結部を成形する下型の型面と中子型の型面との間に柱状部を設けて連結部に貫通孔を形成する。 By the way, in the back pad, in order to attach a headrest made of another member, a through hole penetrating up and down the connecting portion may be formed (for example, Patent Document 1 below). When foaming a back pad having such a through hole, a columnar part is provided between the lower mold surface and the core mold surface for forming the connecting part to form a through hole in the connecting part. .
　しかしながら、成形型内に柱状部を設けると、下型に注入された発泡樹脂原液は、中子型の先端を回り込むようにして連結部及びフランジ部へ順次流れ込むが、その際、貫通孔を成形するための柱状部により液流れが阻害されやすく、成形されたバックパッドの貫通孔周りに欠肉などの成形不良が生じやすいという問題がある。 However, if the columnar part is provided in the mold, the foamed resin stock solution injected into the lower mold flows into the connecting part and the flange part sequentially around the tip of the core mold. Therefore, there is a problem that the liquid flow is likely to be hindered by the columnar portion, and a molding defect such as lacking is likely to occur around the through hole of the molded back pad.
　すなわち、成形型内を流れる発泡樹脂原液は、柱状部によって連結部の幅方向に分断され、柱状部の背後側（つまり、発泡樹脂原液の流れ方向下流側）において合流するが、この発泡樹脂原液の合流部と柱状部との間に、液が流れ込まないエアポケットが形成され、その結果、バックパッドの貫通孔周り、特に柱状部の背後側に相当する貫通孔の周縁後部で欠肉などが発生しやすい。 That is, the foamed resin stock solution flowing in the mold is divided in the width direction of the connecting portion by the columnar part and merges behind the columnar part (that is, downstream in the flow direction of the foamed resin stock solution). An air pocket that does not allow liquid to flow into is formed between the merging portion and the columnar portion, and as a result, there is a lack of thickness around the through hole of the back pad, particularly at the rear edge of the through hole corresponding to the back side of the columnar portion. Likely to happen.
特開２００９－２２０３５９号公報JP 2009-220359 A
　本発明は、以上の点に鑑みてなされたものであり、パッド本体の上辺部から後方に延設された連結部に、成形性を確保しながら貫通孔を設けることができるシート用バックパッド及びその製造方法を提供することを目的とする。 The present invention has been made in view of the above points, and is provided with a back pad for a seat that can be provided with a through-hole while securing formability in a connecting portion that extends backward from the upper side of the pad main body, and It aims at providing the manufacturing method.
　本発明に係るシート用バックパッドは、軟質フォームからなるパッド本体と、前記パッド本体から後方に延設された連結部と、前記パッド本体の背面と間隔をあけて前記連結部から下方へ延設されたフランジ部と、前記連結部を上下に貫通する貫通孔とを成形型で一体に発泡成形したシート用バックパッドにおいて、前記連結部の上面から下方に陥没し、前記貫通孔の周縁部から前記連結部の幅方向一方側へ延設された凹溝を備えることを特徴とする。 The seat back pad according to the present invention includes a pad main body made of a flexible foam, a connecting portion extending rearward from the pad main body, and extending downward from the connecting portion with a gap from the back surface of the pad main body. In the sheet back pad integrally foam-molded with a molding die, the flange portion and the through hole penetrating the connecting portion up and down are depressed downward from the upper surface of the connecting portion, and from the peripheral portion of the through hole. A concave groove extending to one side in the width direction of the connecting portion is provided.
　本発明の好ましい態様として、前記貫通孔の周縁部に上方へ突出する環状突部を備え、前記環状突部の外側から前記凹溝が延設されてもよい。 As a preferred aspect of the present invention, an annular protrusion protruding upward may be provided at a peripheral edge of the through hole, and the concave groove may be extended from the outside of the annular protrusion.
　また、本発明に係るシート用バックパッドの製造方法は、軟質フォームからなるパッド本体と、前記パッド本体の上辺部から後方に延設された連結部と、前記パッド本体の背面と間隔をあけて前記連結部から下方へ延設されたフランジ部と、前記連結部を上下に貫通する貫通孔とを備えたシート用バックパッドを成形型で発泡成形するシート用バックパッドの製造方法において、前記成形型は、前記パッド本体及び前記連結部の外面を成形する下型と、前記フランジ部の外面を成形する上型と、前記連結部及び前記フランジ部の内面を成形する中子型と、前記下型において前記連結部の外面を成形する型面と前記中子型において前記連結部の内面を成形する型面との間に設けられ前記貫通孔を成形する柱状部と、前記下型において前記連結部の外面を成形する型面に前記柱状部の側方から前記連結部の幅方向一方側へ延設された凸条とを備え、前記下型に発泡樹脂原液を注入し、前記上型を前記下型に対して型閉めしてシート用バックパッドを成形することを特徴とする。 In addition, the manufacturing method of the seat back pad according to the present invention includes a pad main body made of flexible foam, a connecting portion extending rearward from the upper side of the pad main body, and a back surface of the pad main body. In the manufacturing method of the sheet back pad, the sheet back pad including the flange portion extending downward from the connection portion and the through hole penetrating the connection portion up and down is foam-molded with a forming die. The mold includes: a lower mold that molds the outer surface of the pad body and the connecting portion; an upper mold that molds the outer surface of the flange portion; a core mold that molds the inner surfaces of the connecting portion and the flange portion; A columnar part for forming the through hole provided between a mold surface for forming the outer surface of the connecting part in the mold and a mold surface for forming the inner surface of the connecting part in the core mold, and the connection in the lower mold And a protruding line extending from the side of the columnar part to one side in the width direction of the connecting part on the mold surface for molding the outer surface of the resin, and injecting a foamed resin stock solution into the lower mold, A sheet back pad is formed by closing the mold with respect to the lower mold.
　本発明によれば、パッド本体の上辺部から後方に延設された連結部に、成形性を確保しながら貫通孔を設けることができる。 According to the present invention, it is possible to provide a through hole in the connecting portion extending backward from the upper side portion of the pad main body while ensuring formability.
本発明の１実施形態に係るシート用バックパッドの斜視図である。It is a perspective view of the back pad for sheets concerning one embodiment of the present invention. 図１に示すシート用バックパッドの背面図である。FIG. 2 is a rear view of the seat back pad shown in FIG. 1. 図２のＡ－Ａ線断面の要部拡大図である。FIG. 3 is an enlarged view of a main part of a cross section taken along line AA in FIG. 2. 図１に示すシート用バックパッドを成形する発泡成形型の断面図である。It is sectional drawing of the foaming mold which shape | molds the sheet | seat back pad shown in FIG. 図４の要部を拡大した断面図である。It is sectional drawing to which the principal part of FIG. 4 was expanded. 図５のＢ－Ｂ線断面図である。FIG. 6 is a sectional view taken along line BB of FIG. 図６のＣ－Ｃ線断面図である。FIG. 7 is a cross-sectional view taken along the line CC of FIG.
　以下、本発明の実施形態について図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　図１，２に示される実施形態のバックパッド１０は、例えば自動車のフロントシートにおける背もたれ部においてクッション材として用いられるシート用バックパッドである。このバックパッド１０は、軟質ポリウレタンフォームなどの弾力性を持つ発泡体からなるパッド本体１２と、その背面側に積層一体化された補強布１４とを備えてなり、織編物や皮革等を縫い合わせた不図示の表皮材によって表面が被覆され、フレーム４（図３参照）に組み付けられることにより、背もたれ部を構成する。 The back pad 10 of the embodiment shown in FIGS. 1 and 2 is a seat back 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 a skin material (not shown) and assembled to the frame 4 (see FIG. 3) to constitute a backrest portion.
　パッド本体１２の背面側における上辺部には、フレーム４を装着するための内向きフランジ状の張り出し部１６が一体に設けられている。張り出し部１６は、パッド本体１２から後方Ｚに突出するように延設された連結部１８と、パッド本体１２の背面と所定間隔を隔てて連結部１８からパッド本体１２の内方に向けて内向きに延設されたフランジ部２０とを備え、パッド本体１２とともに下向きに開口する袋状に形成されている。 An inward flange-like overhanging portion 16 for mounting the frame 4 is integrally provided on the upper side portion on the back side of the pad main body 12. The overhanging portion 16 extends inward from the pad main body 12 toward the inside of the pad main body 12 with a predetermined distance from the connecting portion 18 extending so as to protrude rearward Z from the pad main body 12. And a flange portion 20 extending in the direction, and is formed in a bag shape that opens downward together with the pad main body 12.
　連結部１８は、バックパッド１０の上部を構成し、幅方向中央部にヘッドレスト２８（図２参照）の下部が嵌り込むように下方に陥没する凹陥部３０が形成されている。 The connecting portion 18 constitutes the upper portion of the back pad 10 and is formed with a recessed portion 30 that is recessed downward so that the lower portion of the headrest 28 (see FIG. 2) is fitted in the center portion in the width direction.
　凹陥部３０の底部３０ａには、ヘッドレスト２８に設けられた取付金具２８ａを挿入するための貫通孔３２が連結部１８を上下に貫通するように、連結部１８の幅方向（つまり、左右方向）Ｗに間隔をあけて複数箇所（この例では２箇所）設けられている。貫通孔３２の周縁部には、凹陥部３０の底部３０ａから上方へ突出する環状突部３４が貫通孔３２を取り囲むように設けられている。 In the bottom portion 30a of the recessed portion 30, the width direction of the connecting portion 18 (that is, the left-right direction) is such that a through hole 32 for inserting a mounting bracket 28a provided in the headrest 28 penetrates the connecting portion 18 up and down. A plurality of locations (two locations in this example) are provided at intervals. An annular protrusion 34 protruding upward from the bottom 30 a of the recessed portion 30 is provided at the peripheral edge of the through hole 32 so as to surround the through hole 32.
　また、凹陥部３０の底部３０ａには、底部３０ａから下方に陥没する凹溝３６が設けられている。この凹溝３６は、１つの貫通孔３２に対して左右方向の一方側Ｗ１のみに設けられ、左右方向の他方側Ｗ２に設けられておらず、貫通孔３２の周縁部に設けられた環状突部３４の外側から左右方向の一方向Ｗ１（つまり、環状突部３４の外方）へ延設されている。凹溝３６の深さは、凹溝３６が形成される連結部１８の厚みの２０～８０％の範囲に設定することができる。 Further, a concave groove 36 that is recessed downward from the bottom 30a is provided in the bottom 30a of the concave 30. The concave groove 36 is provided only on one side W1 in the left-right direction with respect to one through hole 32, and is not provided on the other side W2 in the left-right direction. It extends from the outside of the portion 34 in one direction W1 in the left-right direction (that is, outward of the annular protrusion 34). The depth of the concave groove 36 can be set in a range of 20 to 80% of the thickness of the connecting portion 18 where the concave groove 36 is formed.
　なお、本実施形態では、図１に示すようにバックパッド１０を正面から見て左側の貫通孔３２の周縁部に設けられた環状突部３４の左側からは左方へ凹溝３６が延設し、バックパッド１０を正面から見て右側の貫通孔３２の周縁部に設けられた環状突部３４の右側からは右方へ凹溝３６が延設している場合について説明するが、左側の貫通孔３２の環状突部３４の右側から右方へ凹溝３６が延設したり、右側の貫通孔３２の環状突部３４の左側から左方へ凹溝３６が延設してもよい。 In the present embodiment, as shown in FIG. 1, a concave groove 36 extends to the left from the left side of the annular protrusion 34 provided at the peripheral edge of the left through hole 32 when the back pad 10 is viewed from the front. The case where the groove 36 extends rightward from the right side of the annular protrusion 34 provided at the peripheral edge of the right through hole 32 when the back pad 10 is viewed from the front will be described. The concave groove 36 may extend from the right side of the annular protrusion 34 of the through hole 32 to the right, or the concave groove 36 may extend from the left side of the annular protrusion 34 of the right through hole 32 to the left.
　フランジ部２０は、連結部１８側が厚肉部２２に形成されるとともに、先端側が段差部２４を介して厚肉部２２に対して薄肉状の薄肉部２６が形成されている。 The flange portion 20 is formed with a thick portion 22 on the connecting portion 18 side, and a thin portion 26 is formed on the tip side with respect to the thick portion 22 via a step portion 24.
　補強布１４は、袋状に縫製されており、パッド本体１２の背面と張り出し部１６の内側面とを覆うように上記軟質ポリウレタンフォームの発泡成形により一体化されている。補強布１４としては、適度な通気性を持ち、かつ、発泡成形時におけるポリウレタンフォームの浸み出しを防止できるものであれば、特に限定なく用いることができ、不織布や織編物、あるいはこれらの積層複合体などを用いることができる。 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.
　このようなバックパッド１０を成形する発泡成形型５０は、図４に示すように、パッド本体１２及び連結部１８の外面を成形する下型５２と、フランジ部２０の外面を成形する上型５４と、連結部１８及びフランジ部２０の内面を成形する中子型５６とを備える。 As shown in FIG. 4, the foam mold 50 for molding the back pad 10 includes a lower mold 52 that molds the outer surfaces of the pad body 12 and the connecting portion 18, and an upper mold 54 that molds the outer surface of the flange portion 20. And a core die 56 for molding the inner surfaces of the connecting portion 18 and the flange portion 20.
　上型５４は、ヒンジ５８を介して下型５２に対して回動可能に設けられ、下型５２の上面開口を開閉するように構成されており、上型５４の下方に中子型５６を配置した状態で下型５２の上面開口を上型５４が閉塞することで、内部に成形対象のバックパッド１０の形状に対応したキャビティ５９が形成される。 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. A core die 56 is disposed below the upper die 54. When the upper die 54 closes the upper surface opening of the lower die 52 in the disposed state, a cavity 59 corresponding to the shape of the back pad 10 to be molded is formed inside.
　中子型５６は、上型５４に設けられた駆動装置６０により、上型５４から着脱自在に設けられている。 The core mold 56 is detachably provided from the upper mold 54 by a driving device 60 provided on the upper mold 54.
　発泡成形型５０には、図５～図７に示すように、バックパッド１０の連結部１８に貫通孔３２と環状突部３４と凹溝３６とを成形する柱状部６２と環状凹部６４と凸条６６とが設けられている。 As shown in FIG. 5 to FIG. Article 66 is provided.
　詳細には、図７に示すように、柱状部６２は、下型５２において連結部１８の外面を成形する型面５２ａからこの型面５２ａに対向する中子型５６に向けて突出する第１凸部６８と、中子型５６において連結部１８の内面を成形する型面５６ａからこの型面５６ａに対向する下型５２の型面５２ａに向けて突出する第２凸部７０とを突き合わせることで構成されている。 Specifically, as shown in FIG. 7, the columnar portion 62 is a first portion that protrudes from a mold surface 52 a that molds the outer surface of the connecting portion 18 in the lower mold 52 toward a core mold 56 that faces the mold surface 52 a. The convex portion 68 and the second convex portion 70 that protrudes from the mold surface 56a that molds the inner surface of the connecting portion 18 in the core mold 56 toward the mold surface 52a of the lower mold 52 that faces the mold surface 56a. It is composed of that.
　環状凹部６４は、図６に示すように、第１凸部６８の周囲を取り囲むように下型５２の型面５２ａからキャビティ５９の外方へ向けて陥没形成されている。 As shown in FIG. 6, the annular recess 64 is recessed from the mold surface 52 a of the lower mold 52 toward the outside of the cavity 59 so as to surround the first protrusion 68.
　凸条６６は、図５及び図６に示すように、下型５２の型面５２ａからこれに対向する中子型５６の型面５６ａへ向けて突出する平板状をなしており、型面５２ａからの突出高さが、型面５２ａと中子型５６の型面５６ａとの間隔の２０～８０％の範囲に設定されている。この凸条６６は、第１凸部６８の周縁部に設けられた環状凹部６４からバックパッド１０の左右方向の一方側Ｗ１へ延設されている。これにより、凸条６６は、１つの第１凸部６８（柱状部６２）に対してバックパッド１０の左右方向の一方側Ｗ１のみに設けられ、柱状部６２の左右方向の一方側Ｗ１において、下型５２の型面５２ａと中子型５６の型面５６ａとの間隔を狭めて下型５２の底面側から上方Ｘへと流れる発泡樹脂の流れを妨げる。 As shown in FIGS. 5 and 6, the ridge 66 has a flat plate shape protruding from the mold surface 52a of the lower mold 52 toward the mold surface 56a of the core mold 56 facing the mold surface 52a. Is set to a range of 20 to 80% of the distance between the mold surface 52a and the mold surface 56a of the core mold 56. The ridge 66 extends from an annular recess 64 provided at the peripheral edge of the first projection 68 to one side W1 of the back pad 10 in the left-right direction. Thereby, the protrusion 66 is provided only on one side W1 in the left-right direction of the back pad 10 with respect to one first protrusion 68 (columnar part 62), and on one side W1 in the left-right direction of the columnar part 62, The space between the mold surface 52a of the lower mold 52 and the mold surface 56a of the core mold 56 is narrowed to prevent the flow of the foamed resin flowing from the bottom surface side of the lower mold 52 upward X.
　この発泡成形型５０を用いてバックパッド１０を製造するには、まず、予め袋状に縫製された補強布１４を中子型５６に被せ不図示のピンなどで固定することによりセットする。 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.
　次いで、不図示の注入装置を用いて、下型５２に発泡樹脂原液８０を注入した後、図４に示すように、上型５４及び中子型５６を下型５２に対して型閉めする。これにより、発泡樹脂原液８０は、発泡しながら発泡成形型５０のキャビティ５９内を充填していく。 Next, after the foamed resin stock solution 80 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. As a result, the foamed resin stock solution 80 fills the cavity 59 of the foam molding die 50 while foaming.
　具体的には、下型５２に注入された発泡樹脂原液８０は、下型５２と中子型５６との間に形成されたパッド本体１２側から上方Ｘへ向けて中子型５６の先端（つまり、中子型５６の型面５６ａ）を回り込むように流れる。 Specifically, the foamed resin stock solution 80 injected into the lower mold 52 is moved from the pad main body 12 side formed between the lower mold 52 and the core mold 56 toward the upper X, and the tip of the core mold 56 ( That is, it flows so as to wrap around the mold surface 56 a) of the core mold 56.
　その際、図６に示すように、中子型５６の型面５６ａに対向する下型５２の型面５２ａには、第１凸部６８の周縁部から左右方向の一方側Ｗ１のみに凸条６６が突出しており、柱状部６２の左右方向の一方側Ｗ１において発泡樹脂の流れが妨げられているため、中子型５６の先端を流れる発泡樹脂は、柱状部６２によって左右方向Ｗに分断されるが、柱状部６２の左右方向の一方側Ｗ１に比べて他方側Ｗ２に多くの発泡樹脂が流れる。これにより、左右方向の他方側Ｗ２を流れた発泡樹脂は、柱状部６２の背後（発泡樹脂の流れ方向の下流側）を回り込んで一方側Ｗ１へ流れ込み、凸条６６が配設されている左右方向の一方側Ｗ１へ寄った位置Ｐにおいて、柱状部６２によって左右方向Ｗに分断された発泡樹脂が合流する。 At that time, as shown in FIG. 6, the mold surface 52a of the lower mold 52 opposite to the mold surface 56a of the core mold 56 is projected from the peripheral edge of the first projection 68 only to one side W1 in the left-right direction. 66 protrudes and the flow of the foamed resin is obstructed on one side W <b> 1 of the columnar part 62 in the left-right direction. Therefore, the foamed resin flowing at the tip of the core mold 56 is divided in the left-right direction W by the columnar part 62. However, more foamed resin flows on the other side W2 than on the one side W1 of the columnar portion 62 in the left-right direction. Thereby, the foamed resin that has flowed through the other side W2 in the left-right direction flows behind the columnar part 62 (downstream in the flow direction of the foamed resin) and flows into the one side W1, and the ridge 66 is provided. At the position P close to the one side W1 in the left-right direction, the foamed resin divided in the left-right direction W by the columnar portion 62 joins.
　そして、下型５２と中子型５６との間を流れた発泡樹脂は、上型５４と中子型５６との間のフランジ部２０側に流れ込み、バックパッド１０を成形する。 Then, the foamed resin that flows between the lower mold 52 and the core mold 56 flows into the flange portion 20 side between the upper mold 54 and the core mold 56 to mold the back pad 10.
　このようにしてバックパッド１０を発泡成形した後、上型５４を開き、更に駆動装置６０により中子型５６を上型５４から離脱させてから、バックパッド１０を脱型することにより、バックパッド１０が得られる。 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.
　以上のような本実施形態であると、下型５２において連結部１８の外面を成形する型面５２ａに貫通孔３２を成形するための柱状部６２の周縁部から左右方向の一方側Ｗ１へ延設された凸条６６を設けることで、柱状部６２によって左右方向Ｗに分断された発泡樹脂が、柱状部６２の背後から左右方向の一方側Ｗ１へ寄った位置Ｐにおいて合流するため、発泡樹脂が流れ込まないエアポケットができにくく、貫通孔３２の周縁部に欠肉などが発生しにくくなる。 In the present embodiment as described above, the lower mold 52 extends from the peripheral portion of the columnar portion 62 for forming the through hole 32 in the mold surface 52a for molding the outer surface of the connecting portion 18 to the one side W1 in the left-right direction. By providing the provided ridge 66, the foamed resin divided in the left-right direction W by the columnar part 62 is merged at the position P near the one side W1 in the left-right direction from the back of the columnar part 62. It is difficult to form an air pocket that does not flow in, and it is difficult for a lack of thickness or the like to occur in the peripheral portion of the through hole 32.
　また、上記実施形態では、フロントシートにおける背もたれ部の例について説明したが、リアシートの背もたれ部に用いられるバックパッドについても、本発明を適用することができる。その他、一々列挙しないが、本発明の趣旨を逸脱しない限り、種々の変更が可能である。 In the above embodiment, an example of the backrest portion of the front seat has been described. However, the present invention can also be applied to a back pad used for the backrest portion of the rear seat. Although not enumerated one by one, various modifications can be made without departing from the spirit of the present invention.
１０…シート用バックパッド　　　１２…パッド本体　　　１４…補強布
１８…連結部　　　２０…フランジ部　　　２２…厚肉部
２４…段差部　　　２６…薄肉部　　　２８…ヘッドレスト
２８ａ…取付金具　　　３０…凹陥部　　　３０ａ…底部
３２…貫通孔　　　３４…環状突部　　　３６…凹溝
５０…発泡成形型　　　５２…下型　　　５２ａ…型面
５４…上型　　　５６…中子型　　　５６ａ…型面
５８…ヒンジ　　　５９…キャビティ　　　６０…駆動装置
６２…柱状部　　　６４…環状凹部　　　６６…凸条
６８…第１凸部　　　７０…第２凸部　　　８０…発泡樹脂原液 DESCRIPTION OF SYMBOLS 10 ... Seat back pad 12 ... Pad main body 14 ... Reinforcement cloth 18 ... Connection part 20 ... Flange part 22 ... Thick part 24 ... Step part 26 ... Thin part 28 ... Headrest 28a ... Mounting bracket 30 ... Recessed part 30a ... Bottom part 32 ... through hole 34 ... annular protrusion 36 ... concave groove 50 ... foaming mold 52 ... lower mold 52a ... mold surface 54 ... upper mold 56 ... core mold 56a ... mold surface 58 ... hinge 59 ... cavity 60 ... drive device 62 ... Columnar part 64 ... annular concave part 66 ... ridge 68 ... first convex part 70 ... second convex part 80 ... foamed resin stock solution

Claims (3)

  1. 　軟質フォームからなるパッド本体と、前記パッド本体から後方に延設された連結部と、前記パッド本体の背面と間隔をあけて前記連結部から下方へ延設されたフランジ部と、前記連結部を上下に貫通する貫通孔とを成形型で一体に発泡成形したシート用バックパッドにおいて、
    　前記連結部の上面から下方に陥没し、前記貫通孔の周縁部から前記連結部の幅方向一方側へ延設された凹溝を備えることを特徴とするシート用バックパッド。     A pad body made of flexible foam; a connecting portion extending rearward from the pad main body; a flange portion extending downward from the connecting portion at a distance from the back surface of the pad main body; and the connecting portion. In the back pad for a sheet that is integrally foam-molded with a molding die with a through-hole penetrating vertically,
    A seat back pad comprising a recessed groove that is depressed downward from an upper surface of the connecting portion and extends from a peripheral edge portion of the through hole to one side in a width direction of the connecting portion.
  2. 　前記貫通孔の周縁部に上方へ突出する環状突部を備え、前記環状突部の外側から前記凹溝が延設されていることを特徴とする請求項１に記載のシート用バックパッド。 2. The seat back pad according to claim 1, further comprising an annular protrusion protruding upward at a peripheral edge of the through-hole, and the concave groove extending from the outside of the annular protrusion.
  3. 　軟質フォームからなるパッド本体と、前記パッド本体から後方に延設された連結部と、前記パッド本体の背面と間隔をあけて前記連結部から下方へ延設されたフランジ部と、前記連結部を上下に貫通する貫通孔とを備えたシート用バックパッドを成形型で発泡成形するシート用バックパッドの製造方法において、
    　前記成形型は、前記パッド本体及び前記連結部の外面を成形する下型と、前記フランジ部の外面を成形する上型と、前記連結部及び前記フランジ部の内面を成形する中子型と、前記下型において前記連結部の外面を成形する型面と前記中子型において前記連結部の内面を成形する型面との間に設けられ前記貫通孔を成形する柱状部と、前記下型において前記連結部の外面を成形する型面に前記柱状部の周縁部から前記連結部の幅方向一方側へ延設された凸条とを備え、
    　前記下型に発泡樹脂原液を注入し、前記上型を前記下型に対して型閉めしてシート用バックパッドを成形することを特徴とするシート用バックパッドの製造方法。     A pad body made of flexible foam; a connecting portion extending rearward from the pad main body; a flange portion extending downward from the connecting portion at a distance from the back surface of the pad main body; and the connecting portion. In the manufacturing method of the sheet back pad, the sheet back pad having a through-hole penetrating vertically is foam-molded with a molding die.
    The molding die includes a lower mold that molds the outer surface of the pad main body and the connecting part, an upper mold that molds the outer surface of the flange part, a core mold that molds the inner surface of the connecting part and the flange part, A columnar part that is provided between a mold surface that molds the outer surface of the connecting part in the lower mold and a mold surface that molds the inner surface of the connecting part in the core mold; A mold surface that molds the outer surface of the connecting portion, and a protrusion extending from the peripheral edge of the columnar portion to one side in the width direction of the connecting portion;
    A sheet back pad manufacturing method, wherein a foam resin stock solution is injected into the lower mold, and the upper mold is closed with respect to the lower mold to form a sheet back pad.
PCT/JP2013/005941 2012-10-05 2013-10-04 Back pad for seat and manufacturing method therefor WO2014054299A1 (en)

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