JP6367040B2 - Manufacturing method of armrest - Google Patents

Description

  The present invention relates to a method for manufacturing an armrest to be mounted on a vehicle seat such as an automobile.

An armrest AR for armrest used by an occupant M in a horizontal position may be attached to a backrest BR of a seat seat mounted on a vehicle such as an automobile (FIG. 11). The armrest AR is supported by a support shaft m protruding outward from the backrest side surface BR while the stopper pin 22 is regulated by the guide hole 95 of the regulating tool 9, and between the solid line use state and the non-use state shown by the chain line. You can go back and forth. The armrest is rotatably attached to a support shaft m fixed to the backrest side surface BR of the vehicle seat so that the occupant M can keep his arm and keep a comfortable posture. The surface of the foam integrated with the strength reinforcing core 2 is covered with an armrest skin f that improves the appearance.
Regarding the armrest AR, there are several inventions in which the core body 2 is inserted into the bag-like skin f and set in a mold, and then a foaming raw material is injected, and the foam in which the core body 2 is embedded is formed by integral foam molding. It has been proposed (for example, Patent Document 1).

JP 2000-117752 A

  The armrest that inserts the core body 2 and foams and integrally forms the skin is formed by engaging the shaft (the jig in Patent Document 1) for relative positioning of the core body 2 inserted into the bag and the skin f. Although foam molding is performed, a mold release agent is indispensable because a urethane raw material having adhesiveness is used as the foam raw material. A mold release agent had to be applied to the shaft for foam molding.

  However, the need for a release agent has caused some problems. After the release agent is applied to the shaft, it is set in a foaming mold and foamed. However, first, there is a quality problem that the release agent adheres to the skin and becomes dirty. After removing the mold, the shaft is pulled out to make a product. At this time, the shaft and the skin are rubbed, so the release agent applied to the shaft is scraped off, and the release agent is attached to the skin terminal. There has occurred. As the second problem, it took time and labor to apply the release agent and to dry it. The third problem is that even if a release agent is applied, some of the adhesive urethane adheres to the shaft, so this must be washed away in a later process, and an extra shaft is made accordingly. It was necessary to keep. Due to the application of the mold release agent, the foaming mold is also stained with the mold release agent, so that there is a fourth problem that requires this removal work.

  An object of the present invention is to solve the above problems, and to provide a method for manufacturing an armrest that improves the quality and productivity by searching for a configuration in which a release agent is not applied to a shaft.

In order to achieve the above object, the gist of the invention described in claim 1 is that the core body is inserted into the bag-like skin and set in the mold, and then the mold body is closed and the foaming raw material is injected, In the manufacturing method of the armrest that integrally foams the embedded foam, in the shaft, in addition to the shaft portion, an enlarged portion having an outer diameter larger than the shaft diameter is provided at the proximal end portion of the shaft portion, In addition to the side peripheral surface of the shaft, a tubular film made of a polyolefin-based plastic film was covered from the shaft portion to the enlarged diameter portion to form a shaft with a tubular film, and then inserted into the bag-like skin The shaft is inserted into the opening provided on the other side from the opening provided on one side of the bag-shaped skin so as to pass through the through-hole of the core body , and the shaft is inserted through the tubular film. The top surface of the enlarged diameter portion is on the side plate portion related to the core body on the opening side. In the contact, and inserting the tubular film with shaft epidermis, and tubular film between the open hole and opening and disposed, was set core and the tubular film with the shaft Thereafter, the mold rests on the armrest manufacturing method. According to a second aspect of the present invention, there is provided the armrest manufacturing method according to the first aspect , wherein the shaft is provided with a step portion at a portion of the shaft portion disposed near the side plate portion of the core body located on the opening side. While reducing the diameter of the previous shaft portion, the tubular film was provided with a tapered portion at a position corresponding to the stepped portion, and a small-diameter tubular portion corresponding to the diameter of the shaft portion was further extended. It is characterized by that. According to a third aspect of the present invention, there is provided an armrest manufacturing method according to the first or second aspect, wherein the shaft has a tapered shape with a tapered tip, and the cylindrical film has a tapered shape with a tapered tip corresponding thereto. It is characterized by. A method for manufacturing an armrest according to a fourth aspect of the present invention is the method for manufacturing an armrest according to the first or second aspect, wherein the shaft portion protruding from the opening is inserted through a first hole provided in a holding jig placed on the skin of the peripheral edge of the opening. Furthermore, it is characterized in that a core and a shaft with a tubular film are set by screwing and fixing with a nut to a screw portion provided at the tip of the shaft portion. According to a fifth aspect of the present invention, there is provided an armrest manufacturing method according to the first to third aspects, wherein the cylindrical film is a covered cylindrical film whose tip is sealed with a seal portion.

  The armrest manufacturing method of the present invention does not apply a release agent to the shaft while using the shaft, and can smoothly remove the shaft from the product after demolding, improving workability, improving quality, and cost. Demonstrates excellent effects such as reduction.

In one form of the manufacturing method of the armrest, (a) is a front view in which the core body is inserted into the bag-shaped skin and engaged with the skin, (b) is a perspective view of the core body of (a), (c) Is a perspective view of a tubular film and a shaft. FIG. 2 is a front view in which a shaft is inserted into the cylindrical film of FIG. It is the III-III arrow directional view of FIG. It is a principal part enlarged view of FIG. FIG. 4 is a cross-sectional view of the foaming mold in which the skin, core, shaft with cylindrical film, and pressing jig shown in FIG. 3 are set in the foaming mold. FIG. 6 is a cross-sectional view after mold closing and foam molding after FIG. 5. FIG. 7 is a cross-sectional view of the armrest that has been removed from the mold after foam molding in FIG. It is another aspect figure which replaces FIG. It is another aspect figure which replaces FIG. FIG. 10 is a diagram illustrating another embodiment instead of FIG. 9. (A) An explanatory view in which an armrest for comparison is attached to the seat, and (B) is an enlarged view of the armrest of (A).

Hereinafter, the manufacturing method of the armrest which concerns on this invention is explained in full detail.
FIGS. 1-6 is one form of the manufacturing method of the armrest which concerns on this invention, FIG. 1 (a) is the front view which inserted the core body in the bag-like skin and engaged with the skin, (b) (B) is a perspective view of a tubular film and a shaft, FIG. 2 is a perspective view of a tubular film and a shaft of FIG. 1 (c), and after inserting the shaft into the tubular film of FIG. FIG. 3 is a front view taken along the line III-III in FIG. 2, FIG. 4 is an enlarged view of the main part of FIG. 3, and FIG. 6 is a cross-sectional view of the shaft with a cylindrical film and a holding jig set in a foam mold, FIG. 6 is a cross-sectional view of the mold closed and foam-molded after FIG. 5, and FIG. FIG. 8 is another embodiment diagram instead of FIG. 4, FIG. 9 is another embodiment diagram replacing FIG. 6, and FIG. 10 is another embodiment diagram replacing FIG. In order to make the drawing easy to understand, the shaft with the cylindrical film is drawn apart from each other, and the hatching showing the cross section of the skin 1 and the core body 2 is omitted in some drawings.

Prior to this, the armrest is prepared by preparing an armrest skin 1, a core body 2, and a foam film 6 having a nested part shaft 62 and a tubular film 7.
The skin 1 is a bag-like body provided with an opening 10 that can be sewn for armrests with a plurality of fabric skin pieces and into which the core body 2 can be inserted into the bag-like skin 19. A slab urethane or a plastic film is appropriately laminated on the fabric skin piece. The laterally long bag-shaped skin 1 adapted to the outer shape of the armrest has, in use, an upper surface portion 12 on which an occupant's arm ar is placed and side portions extending downward from both side edges of the upper surface portion 12. The opening 10 is provided on one side 11 and the opening 17 is provided on the other side 13. Before setting to the foaming mold 6, the shaft 62 is inserted from the opening 17 to the opening 10, and the skin 1 is engaged with the shaft 62 (details will be described later). The armrest skin 1 uses a support shaft insertion opening on the backrest side BR as an opening 10 for inserting the core body 2 into the bag, and the opening 10 is an opening having a size through which the core body 2 is inserted. Has an area.
The epidermis 1 also has a semi-island-like epidermis portion 15a protruding from a part of the peripheral edge 10e toward the stopper pin 22 of the core body 2 looking into the opening 10 as the core body 2 is set in the bag 19. A positioning portion 15 having a through-hole 15b in the skin portion 15a at a portion facing the stopper pin 22 is provided.

The core body 2 is a member for reinforcing the strength of the armrest P. As shown in FIG. 11, the upper plate 2A1 and both side plates 2A2 form a U-shaped plate portion of the box-shaped plate body 2A, and two stay portions 2B1 extending from both ends of the connecting portion 2B2 related to the U-shaped shaft member 2B are provided. Although it may be a metal product welded to both side plates 2A2, here it is a synthetic resin molded product as shown in FIG. When the armrest is used, a horizontally long upper plate portion 2a is disposed substantially horizontally toward the front of the vehicle, and a box-shaped product having a lower surface opening provided with side plate portions 2b and end plate portions 2c that are bent and extended from the outer peripheral edge thereof. . Support shaft through-holes 20 are disposed opposite to the side plate portions 2b of the core body 2 so that the core body 2 is supported by the support shaft m. The through-hole 20 is provided on the vehicle rear side of the side plate portion 2b in the use state, and a stopper pin 22 is attached to the outer wall surface 2b1 in the vicinity thereof.
The core body 2 of the present embodiment further forms a bank-like rib 26. The rib 26 is the outer wall surface 2 b 1 of the core body 2, and corresponds to the opening peripheral edge portion 102 that faces the opening peripheral edge portion 101 that protrudes the positioning portion 15 and the opening 10 when the core body 2 is set in the inner skin 19. At the site, a bulge is formed so as to contact the peripheral edge 10e of the opening 10 from the opening 10 side. The rib 26 is provided on the protrusion along the opening peripheral edge 10e in a state where the core body 2 is set on the skin 1. Reference numeral 223 denotes a lock nut, reference numeral 2d denotes a reinforcing portion, reference numeral 27 denotes an injection port for the foaming raw material g, and reference numeral 2e denotes a hole. The core body 2 is sized to be disposed at a predetermined position in the bag 19 as shown in FIG. 1 so as to ensure the necessary strength of the armrest P and to give the armrest P a comfortable feeling of use.

The foaming mold 6 having the shaft 62 of the nesting part is a split mold as shown in FIG. 5, and includes a lower mold 6a and an upper mold 6b. When the mold is closed using the hinge 6n as a fulcrum, an armrest cavity 60 is formed by both molds 6a and 6b (FIG. 6). In this embodiment, the armrest P is formed horizontally with the stopper pin 22 of FIG. 1 facing upward.
In the lower mold surface 61, the shaft 62 can be detachably attached to the corresponding position of the opening 17 of the skin 1 and the shaft through-hole 20b on the other side 2b2 of the core body 2 (without the stopper pin 22). A dent 611 is provided for standing and holding.

  The shaft 62 is made of metal, and in addition to a shaft portion 622 as a main portion, an enlarged diameter portion 621 having an outer diameter larger than the shaft diameter is provided at a proximal end portion of the shaft portion 622 (FIG. 1). The enlarged diameter portion 621 is inserted into the recess 611, and the enlarged diameter portion 621 penetrates through the opening 17 of the skin 1 arranged in the lower mold 6a. In FIG. 3 and FIG. The top surface 621a of 621 abuts the lower core body side plate portion 2b around the support shaft through hole 20b toward the other side portion 2b2 via the tubular film 7, and supports the core body 2, The core body 2 is separated from the skin back surface 1b and fits in the bag 19. When the enlarged diameter portion 621 is inserted into the recess 611, the shaft 62 stands on the lower mold surface 61. When the shaft 62 is covered with the tubular film 7 to form the shaft 62 with the tubular film 7, it passes from the opening 17 of the skin 1 to the opening 10 so as to pass through the through hole 20 of the core body 2 inserted into the inner skin 19. And the cylindrical film 7 can be disposed between the opening 17 and the opening 10.

The tubular film 7 is an elongated tubular body made of a polyolefin-based plastic film. The tubular film 7 may be attached to the shaft 62 here, although the tubular film 7 may be held on the tubular body with an adhesive tape or the like after the planar film is wound around the side circumferential surface 622b of the shaft 62 and covered. Pre-formed into a pipe shape. This is a cylindrical film 7 formed into a cylindrical shape with a plastic film made of an ethylene-based hydrocarbon having poor adhesion to a foamed resin raw material such as a polyurethane material having high adhesive strength for forming a foam. The cylindrical film 7 has a cylindrical diameter that can be inserted into the shaft 62 and attached to the side peripheral surface (specifically, the side peripheral surface 622b of the shaft portion 622). As shown in FIGS. 1 and 3, the shaft 62 with the tubular film 7 can be formed by inserting the shaft 62 into the tubular film 7. The tubular film 7 referred to in the present invention includes a thick tubular sheet.
Polyolefin-based plastic films can be general-purpose plastic films such as polyethylene and polypropylene, but in order to improve non-adhesiveness with foamed resin raw materials such as polyurethane materials, lubricants such as hydrocarbons such as paraffin, higher alcohols and fatty acids are added. It is more preferable that

  In the present embodiment, a holding jig 5 made of a board as shown in FIGS. 2 and 3 having a size covering the opening 10 is prepared. The presser jig 5 has a first hole 50 at a portion facing the support shaft through hole 20 a on one side of the core body 2 set in the bag 19, and a first hole 50 at a portion facing the stopper pin 22. Two holes 52 are provided. A third hole 57 is provided in a portion facing the injection port 27 for the foaming raw material g provided in the core body 2.

  The armrest P is manufactured as follows using the skin 1, the core body 2, the foaming mold 6 having the nesting shaft 62, the tubular film 7, and the pressing jig 5. After the core body 2 is inserted and set in the bag-like skin 19, the foam 3 in which the core body 2 is embedded is subjected to foam closing through the mold closing and injection of the foaming raw material g. A shaft 62 with 7 is used to prevent the foaming raw material g and the foam 3 from adhering to the shaft 62.

First, the core body 2 is engaged with the skin 1 and set in the bag 19. Specifically, the core body 2 is inserted from the skin opening 10 and the core body 2 is stored in the bag 19. The positioning part 15 is turned up and the core body 2 is inserted from the opening 10 into the bag 19.
Next, the rib 26 that looks into the opening 10 is brought into contact with the peripheral edge 10e of the skin 1 containing the core 2 after the insertion of the core 2 from the opening 10 into the bag 19 is completed. Further, the positioning portion 15 that has been turned up is tilted toward the inside of the opening 10, and the stopper pin 22 is inserted into the through hole 15b. The core body 2 is corrected and moved to almost the normal position in the inner skin 19 simply by applying the rib 26 to the opening peripheral edge 10 e and fitting the through hole 15 b into the stopper pin 22.

Before and after this, the shaft 62 is inserted into the cylindrical hole 78 of the cylindrical film 7, and the cylindrical film 7 is covered on the side peripheral surface 622 b of the shaft 62 to form the shaft 62 with the cylindrical film 7.
As shown in FIG. 1, the cylindrical film 7 of the present embodiment has a main cylindrical portion 72 that is attached to the shaft portion 622 with a tube diameter slightly larger than the shaft diameter of the shaft portion 622, and A connecting portion that extends annularly outward from the base edge to form an annular portion 74, and a large diameter that extends in a cylindrical shape from the outer peripheral edge of the annular portion 74 and covers the majority of the outer peripheral surface 621b of the enlarged diameter portion 621 A cylindrical portion 71. The cylinder diameter of the large diameter cylinder part 71 is slightly larger than the outer diameter of the enlarged diameter part 621. When the shaft 62 with the tubular film 7 is formed, the annular portion 74 covers the top surface 621a in a state where the tip 79 of the tubular film 7 reaches near the tip of the shaft portion 622 as shown in FIG. 71 covers the upper half of the enlarged diameter portion 621. Except for the portion of the shaft portion 622 that protrudes from the tubular film front end 79, the main tube portion 72 adheres to and covers the shaft portion 622. The large-diameter cylindrical portion 71 tightly covers the enlarged-diameter portion 621.

  Thereafter, the shaft 62 with the tubular film 7 is inserted between the opening 10 and the opening 17 of the skin 1. It passes through the opening 10 provided in one side 11 of the bag-like skin 1 and the opening 17 provided in the other side 13 of the skin 1 so as to pass through the through-hole 20 of the core body 2 inserted into the inner skin 19. Then, the shaft 62 with the tubular film 7 is inserted into the skin 1, and the tubular film 7 is disposed between the opening 17 and the opening 10. As shown in FIGS. 3 to 4, the shaft portion 622 of the shaft 62 is inserted into both the support shaft through holes 20 of the side plate portions 2 b of the core body 2 from the opening 17 of the skin 1, so that the cylindrical film 7 is at least both The tip of the shaft portion 622 is projected out of the opening 10 so as to be disposed between the through holes 20. Here, the cylindrical film 7 is covered from the shaft part 622 to the enlarged diameter part 621, and the top surface 621 a of the enlarged diameter part 621 via the cylindrical film 7 is the side plate part related to the core body 2 on the opening 17 side. 2b, and the shaft portion 622 at the tip is inserted into the opening 10 from the support shaft through hole 20b provided in the other side portion 2b2. By inserting the shaft portion 622, the leading end 79 of the tubular film 7 reaches the vicinity of the through hole 20a of the side plate portion 2b of the core body 2 on the opening 10 side as shown in FIG.

  Subsequently, the shaft portion 622 protruding from the skin opening 10 is inserted into the first hole 50 of the holding jig 5, and the nut N is screwed and fixed to the tip portion of the shaft portion 622. The shaft portion 622 of the shaft 62 is passed through the opening 17 of the skin 1 and both the through holes 20 of the core body 2, and the shaft portion 622 appearing in the skin opening 10 is passed through the first hole 50 of the holding jig 5. The shaft portion 622 is fixed to the tip portion of the shaft portion 622 with a nut N. The skin 1 and the core body 2 are engaged and locked to the shaft 62 with the tubular film 7, and are integrally set together with the pressing jig 5. A presser jig 5 is attached so as to cover the opening 10 of the skin 1, and the peripheral edge 10 e of the presser jig 5 and the core 2 set in the bag 19 of the skin 1 wrap around the opening 10. Is clamped with a nut N (FIG. 4). By tightening the nut N, the pressing jig 5 and the core body 2 sandwich and seal the skin portion that goes around the opening 10. An integrated product in which the core body 2 and the shaft 62 with the tubular film 7 are assembled and set on the skin 1 can be obtained.

The insertion of the stopper pin 22 into the through-hole 15b, the insertion of the shaft shaft portion 622 into the skin 1 and the core body 2, and the fixing by the shaft 62, the holding jig 5 and the nut N are the core body 2 with respect to the skin 1 And positioning relative to the core 2 of the skin opening 10 is ensured.
At the same time, the shaft 62 to be positioned is kept in a state where the outer peripheral surface of the shaft 62 disposed in the inner skin 19 is covered with the tubular film 7, and the foaming raw material does not adhere to the shaft 62 in the subsequent foam molding. It is like that.

  Specifically, the portion of the shaft 62 arranged in the inner skin 19 is covered with the tubular film 7 as shown in FIG. The main cylindrical portion 72 related to the tubular film 7 covering the shaft portion 622 extends from the proximal end to the distal end 79 so as to cover the proximal end portion of the shaft portion 622, and the distal end 79 is the one on which the stopper pin 22 is present. It reaches the edge of the through hole 20a provided in the side plate portion 2b. Further, the ring-shaped portion 74 extending from the base end of the main tube portion 72 related to the tubular film 7 covers the top surface 621a of the diameter-enlarged portion 621 of the shaft 62, and further, the large-diameter tube portion 71 extending from here. It covers from the expanded surface top surface 621a to at least the outer peripheral surface 621b of the expanded diameter portion 621 that goes out of the skin 1. Therefore, there is no portion where the outer peripheral surface of the shaft 62 is exposed in the inner skin 19, and even if it exists, there is only a slight gap between the tip 79 of the tubular film 7 reaching the crack of the through hole 20a and the through hole 20a. It is in.

  After that, the assembled product of the above-described skin 1, core 2, and shaft 62 with the tubular film 7 completed outside the mold is set in the lower mold 6a (FIG. 5). Positioning of the core body 2 with respect to the skin 1 and positioning of the skin opening 10 relative to the core body 2 are performed by the shaft 62, the skin portion 15 a with the through holes 15 b and the pressing jig 5, and the shaft 62 within the skin 19. In the state where the portion is covered and protected by the tubular film 7, the enlarged diameter portion 621 of the shaft 62 is inserted into the recess 611 and set in the foaming mold 6.

  Next, the foam 3 in which the core body 2 is embedded is foamed integrally with the skin through mold closing and injection of the foam raw material g according to a generally known procedure. Specifically, the upper die 6b is operated to close the die (see FIG. 6). By closing the mold between the upper mold 6b and the lower mold 6a, an armrest cavity 60 in which the core body 2 is insert-set is formed. Subsequently, using a funnel F or the like, a predetermined amount of a foaming raw material g such as an armrest molding urethane foaming stock solution is injected into the skin 1 disposed in the cavity 60 of the lower mold 6a. In addition, although the foaming raw material g was inject | poured after mold closing, the order of injection | pouring of mold closing and foaming raw material is not ask | required.

After that, the process proceeds to foam molding of the armrest P. The mold-closed state is maintained for a predetermined time, and an armrest-shaped foam 3 is formed by foam molding, in which the core body 2 is embedded and integrated, and the skin 1 covering the outer surface is integrated (FIG. 6). At this time, since the shaft 62 is covered with a polyolefin-based tubular film 7 such as polyethylene, the portion of the inner surface 19 is prevented from adhering to the foam raw material g and the foam 3 in the foam molding process. .
Thus, the foam 3 of the armrest P into which the core body 2 is inserted is integrally molded with the skin. When the integral foam molding of the armrest P is completed, demolding (demolding step), and the holding jig 5 and the shaft 62 with the tubular film 7 are removed, the desired armrest P having a stable quality as shown in FIG. 7 is obtained.
A cylindrical film 7 made of a non-adhesive polyolefin-based plastic film with respect to the foaming raw material g and the foam 3, and covers almost the entire region of the shaft 62 existing in the inner skin 19, so that the cylindrical film 7 is attached. The shaft 62 can be smoothly extracted from the armrest P after foam molding.

FIG. 8 is an enlarged view using the shaft 62 with the tubular film 7 of another embodiment instead of the shaft 62 with the tubular film 7 shown in FIG. 4. The shaft 62 is provided with a step portion 622d in a portion of the shaft portion 622 disposed near the side plate portion 2b of the core body 2 located on the opening 10 side, and the diameter of the shaft portion 622 beyond that is reduced. Further, the tubular film 7 a tapered portion 76 provided at a position corresponding to the stepped portion 622d, thereby further extending the small-diameter cylindrical portion 73 matching the diameter of the shaft portion 622 to its destination. When the stepped portion 622d and the tapered portion 76 are provided, when passing the shaft 62 with the tubular film 7 from the opening 17 to the opening 10 so as to pass through the through hole 20 of the core body 2 housed in the inner skin 19, Since the step portion 622d and the taper portion 76 act as a stopper, the tip 79 of the tubular film 7 is not displaced and is more preferable.

FIG. 9 is an explanatory view using the shaft 62 with the tubular film 7 of another embodiment different from FIGS. 1 to 8, and is an explanatory cross-sectional view corresponding to a cross-sectional view in which the mold is closed from the state of FIG.
The tubular film 7 is a covered tubular film 7 whose tip is sealed with a seal 75. As shown in the drawing, since the pressing jig 5 is not used, the shaft 62 does not have the threaded portion 622a. The seal portion 75 is positioned on the distal end side of the shaft portion 622, and the tubular film 7 covers from here to the enlarged diameter portion 621. The upper mold 6b of the foaming mold 6 is provided with a recess 651 in the region of the shaft 62 and the stopper pin 22 and forms the sealing mold surface 65 that the pressing jig 5 has played (FIG. 9).
In the manufacture of the armrest, the rib 26 is brought into contact with the periphery of the opening at the skin 1 containing the core body 2 after the insertion of the core body 2 from the opening 10 into the bag 19 and the stopper pin 22 is inserted into the through hole 15b. . Before and after this, the shaft 62 with the tubular film 7 is inserted from the opening 17 of the skin 1 into the both-shaft through-holes 20 of the both side plate portions 2b of the core body 2, and inserted into the tubular shape. The tip of the shaft 62 with the film 7 is seen through the opening 10.
Thereafter, the assembled product of the shaft 62 with the tubular film 7 and the outer skin 1 containing the core 2 completed outside the mold is set in the lower mold 6a and the mold is closed (FIG. 9). By closing the mold, the upper skin surface 65 and the core body 2 around the recess 651 sandwich and seal the outer skin portion that circulates the opening 10, thereby preventing foaming material leakage during foam molding. The portion of the shaft 62 disposed in the inner skin 19 is completely covered with the polyolefin-based tubular film 7, and the foaming raw material g and the foam 3 do not adhere to the shaft 62 during foam molding. Other configurations are the same as those described with reference to FIGS. The same reference numerals used in FIGS. 1 to 7 denote the same or corresponding parts.
Further, in FIG. 9, instead of the shaft 62 with the covered cylindrical film 7, the tip of the shaft 62 is tapered, and the cylindrical film 7 is also tapered at the tip in accordance with FIG. It is good also as the shaft 62 with the tip taper film 7 like this. Even in this way, most of the peripheral side surface 622 b of the shaft 62 can be covered with the tubular film 7. The shaft 62 in FIG. 10 exposes the protruding end 622e.

In the armrest manufacturing method configured as described above, the tubular film 7 is disposed between the opening 17 and the opening 10 of the skin 1, the core body 2 and the shaft 62 with the tubular film 7 are set, and then the mold Since it is closed and foam-molded, even if it is the polyurethane raw material g having high adhesive strength or the foam 3 thereof, the attachment to the shaft 62 is blocked by the tubular film 7. Since the tubular film 7 is made of a polyolefin-based plastic film that is non-adhesive to the polyurethane raw material g and the foam 3, the shaft 62 with the tubular film 7 can be smoothly removed from the armrest product after demolding. it can. Since the cylindrical film 7 covering the shaft 62 is made of a polyolefin plastic film having poor adhesion to the foaming raw material g, the entire shaft 62 with the cylindrical film 7 can be easily extracted from the armrest product. Since the foam 62 or the like is not attached to the shaft 62 with the tubular film 7 after being extracted and there is no dirt, the shaft 62 with the tubular film 7 for manufacturing the next armrest can be reused as it is. Further, the trace of the shaft 62 with the tubular film 7 is beautiful and sufficiently fulfills the role as a mounting hole for the support shaft m.
The foam molding of the armrest P can be smoothly performed without using a release agent as in the past. Since it is not necessary to use a release agent, the problem of quality that the release agent adheres to the skin 1 and the problem of labor and work time required to apply and dry the release agent are solved. Further, even if a mold release agent is applied, adhesive urethane partially adheres to the shaft 62, so this must be removed by washing in a later step, and an extra portion of the shaft 62 is prepared accordingly. Since the foaming mold 6 is also soiled by the mold release agent due to stock problems and the application of the mold release agent, problems such as the need for this removal work are eliminated, improving quality, improving productivity, reducing costs, etc. Exhibits excellent effects.

  Further, the shaft 62 is inserted into both the through holes 20 provided in the both side plate portions 2b of the core body 2 and the cylindrical film 7 is disposed at least between the both through holes 20 so that the core 1 is attached to the skin 1. When the body 2 and the shaft 62 with the tubular film 7 are set, there is the tubular film 7 between the two through holes 20, so that most of the core body 2 existing in the inner skin 19 is covered with the tubular film 7. Thus, it is possible to prevent the foam material from adhering to the shaft 62 in the subsequent foam molding. Since the shafts 62 are inserted through the through holes 20, the core body 2 can be easily positioned on the shafts 62.

Further, the shaft 62 is provided with a shaft portion 622 and an enlarged diameter portion 621, and the top surface 621 a of the enlarged diameter portion 621 is in contact with the side plate portion 2 b on the opening 17 side through the tubular film 7. When the shaft 62 is inserted from 17 to the opening 10 and the core body 2 and the shaft 62 with the tubular film 7 are set, the tubular film 7 is also interposed in the enlarged diameter portion 621, so that the shaft 62 is formed by foam molding. It is possible to make every effort to prevent adhesion of the foaming raw material g. When the diameter-enlarged portion 621 is provided on the shaft 62, the top surface 621a is brought into contact with the side plate portion 2b on the opening 17 side, and the core body 2 is separated from the skin back surface 1b and is stored in the bag 19 in a floating state. be able to.
In addition, with the shaft 62 as a nested part, the shaft portion 622 protruding from the opening 10 is inserted through the first hole 50 provided in the holding jig 5 placed on the skin 1 of the opening peripheral edge 10e, and further the shaft portion If the threaded portion 622a provided at the tip portion can be screwed and fixed with a nut N, the core body 2 and the shaft 62 with the tubular film 7 are smoothly assembled to the outer skin 1 before setting to the foaming mold 6, The set can be fixed. If the cylindrical film 7 is made into the covered cylindrical film 7 which seals the front-end | tip part with the seal part 75, the shaft 62 which fits in the inner skin 19 can be completely covered with the cylindrical film 7, and much more quality You can aim for improvement.

  The present invention is not limited to those shown in the above-described embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. The shape, size, number, material, and the like of the skin 1, the core 2, the foam 3, the shaft 62, the tubular film 7 and the like can be appropriately selected according to the application.

1 Skin 10 Opening 17 Opening 19 Inside the bag (inside the skin)
2 Core body 2b Side plate part 20 Through-hole 3 Foam 5 Pressing jig 50 First hole 62 Shaft 621 Expanded part 621a Top surface 622 Shaft part 622a Screw part
622d Step 7 Tubular film
73 Small diameter cylinder part 75 Seal part
76 Taper
79 Tip

Claims (5)

In the manufacturing method of the armrest which inserts the core body into the bag-shaped skin and sets it in the mold, then closes the mold and injects the foaming raw material, and foams the core body embedded into the skin integral foam molding,
In addition to the shaft, in addition to the shaft portion, an enlarged diameter portion having an outer diameter larger than the shaft diameter is provided at the proximal end portion of the shaft portion. A tubular film made of a polyolefin-based plastic film is covered to form a shaft with a tubular film, and then passed through the through-hole of the core inserted into the bag- shaped skin, The shaft is inserted from the opening provided on one side to the opening provided on the other side, and the top surface of the enlarged diameter portion is related to the core on the opening side through the tubular film. The cylindrical film is inserted between the opening and the opening so that the shaft with the cylindrical film is inserted into the skin so as to contact the side plate , and the core and the cylindrical film are provided. After the shaft is set, the armrest is characterized by closing the mold. Method. The shaft is provided with a step portion in the shaft portion disposed near the side plate portion of the core body located on the opening side, and the diameter of the shaft portion ahead of the shaft portion is reduced. The method of manufacturing an armrest according to claim 1, wherein a tapered portion is provided at a position corresponding to the stepped portion, and a small-diameter cylindrical portion matching the diameter of the shaft portion is further extended. The method of manufacturing an armrest according to claim 1 or 2, wherein the shaft has a tapered shape with a tapered tip, and the tubular film has a tapered shape with a tapered tip corresponding to the tapered shape. The shaft protruding from the opening is inserted through a first hole provided in a holding jig placed on the skin of the periphery of the opening, and is further screwed and fixed with a nut to a screw provided at the tip of the shaft. The manufacturing method of the armrest of Claim 1 or 2 which sets a shaft with a core and a cylindrical film. The method for manufacturing an armrest according to any one of claims 1 to 3, wherein the tubular film is a covered tubular film whose tip is sealed with a seal portion.

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