JP5151218B2 - Skin terminal fixing method - Google Patents

Description

  The present invention relates to a method for fixing a skin terminal in the case where a core material is covered and integrated.

  For example, an armrest provided in a door trim of an automobile is composed of a resin core material and a soft skin coated on the surface of the core material. In order to enhance the tactile sensation, a skin composed of a cushion layer made of slab urethane or the like and a soft skin layer laminated on the surface of the cushion layer is often used.

  To manufacture such an armrest, prepare a skin that has been cut into a shape larger than the core material in advance, cover the surface of the core material with the skin, and place the end of the skin along the periphery of the core material. After the folding, a method of fixing the folded terminal to the back side of the core material with a tacker is performed. The armrest manufactured in this manner is engaged and fixed to the door trim by a clip or the like that protrudes from the back surface side of the core member in the automobile assembly process.

  However, since the skin layered with slab urethane or the like is relatively thick and has high rigidity, even if it is folded back to the back side of the core material, it tries to return to its original shape by its own elasticity. Therefore, it is necessary to fix the folded terminal to the core member in a state where the folded terminal is held on the back surface of the core member with a finger. Further, if the core material and the skin are not in close contact, the skin may be lifted or wrinkled when assembled to the door trim, causing a problem in design. Therefore, the operator needed to press and hold the core while pulling the skin. However, if such work is continued for a long time, there is a problem that the burden on the operator's finger is heavy. Particularly at the corners of the core material, it is necessary to overlap and fix the skins on the two sides sandwiching the corners, which is particularly difficult to work with.

  Therefore, for example, Japanese Utility Model Publication No. 06-044677 describes that the end of the core is made thick and the back surface of the thick part is flat. If such a core material is used, the folding can be easily performed and the folding margin can be increased, so that the burden on the operator can be reduced.

  However, when a thick part is formed in the core material, the weight increases accordingly. Moreover, when there is a restriction on the mounting space, it may be difficult to increase the thickness, and such a case cannot be dealt with.

  Japanese Patent No. 2691042 describes a structure in which a hard locking plate is provided at the folded portion of the skin, and the folded portion is fixed by being engaged with a locking portion formed on the back surface side of the core material. Yes. According to this technique, the folded portion of the skin can be fixed to the core material without using a tucker or the like, and the burden on the operator can be greatly reduced.

However, since the man-hour and the number of parts for providing the locking plate at the folded portion increase, there is a problem that the cost becomes high. In addition, when the shape of the core material is complicated, the shapes of the locking plate and the locking portion are also complicated, and it may not be possible to fix the folded portion around the entire circumference of the core material.
No.06-044677 Japanese Patent No. 2691042

  The present invention has been made in view of the above circumstances, and can easily fix the folded portion of the skin terminal to the core material without using another member such as a locking plate and without changing the shape of the core material. Doing so is an issue to be solved.

The feature of the skin terminal fixing method of the present invention that solves the above problems is that the surface of the core material is covered with the skin, and the folded terminal that is folded back along the peripheral edge of the core material on the back side of the core material In the skin terminal fixing method to fix,
The core has corners at both ends, and the skin has bag corners that are folded and joined to each other at both ends corresponding to the corners of the core .
Prepare a soft concave mold with an undercut part, and cover the laminated body of the skin and core with the corner and bag corner positioned and covered so that the skin faces the concave surface. In the state where the end of the skin is forcibly folded back and held on the back side of the core material at the undercut portion and is fixed to the back side of the core material, the core material and the skin It is to remove the integrated product.

  According to the skin terminal fixing method of the present invention, the folded terminal is fixed to the back surface side of the core member in a state where the corner of the bag is put on the corner and the corner and the bag corner are positioned and held. That is, since the corner portion of the bag is engaged and held by the corner portion, there is no need to press the corner portion of the bag with a finger. Pulling the skin on the opposite side of the bag corner creates tension in the skin, and in that state, the terminal on the side opposite to the bag corner is folded back and secured to the core, preventing the occurrence of wrinkles. Can be fixed at both ends. Thereafter, the remaining folded terminals are fixed to the core member, and the bag corners are fixed to the core member to complete the fixing. Therefore, the burden on the operator's finger when the folded terminal is pressed and held on the back surface of the core can be greatly reduced.

  In addition, conventionally, the terminal is fixed to the corner of the core by folding the two sides sandwiching the corner and overlapping with the finger while holding it with a finger. Since it fixes in the state which covered the corner | angular part, the fixing operation | work to the corner | angular part of a bag corner part becomes very easy.

And since the terminal of the skin is forcibly folded back and held on the back side of the core material by the concave undercut part, the burden on the operator's finger when pressing and holding the folded terminal on the back surface of the core material is increased. Can be reduced.

  The skin terminal fixing method of the present invention is a method in which the surface of the core material is covered with the skin, and the folded terminal folded back along the peripheral edge portion of the core material is fixed to the back surface side of the core material.

  The core material may be made of wood or resin and has at least one corner. The corner generally refers to a portion where two sides intersect with an acute angle or an obtuse angle, but the apex may be chamfered or may be an arc-shaped corner. In this case, the angle at which the pair of tangents drawn so as to sandwich the corners is less than 180 degrees is acceptable.

  As the skin, a soft material formed from woven fabric, knitted fabric, non-woven fabric, leather, thermoplastic elastomer, polyvinyl chloride or the like is used. What laminated | stacked cushion layers, such as slab urethane, on the back side can also be used.

  The epidermis has a bag corner portion in which two sides sandwiching the corner portion of the core are folded and joined to each other. As the joining means, sewing, adhesion, welding, or the like can be employed.

  In the skin terminal fixing method of the present invention, the folded terminal is fixed to the back surface side of the core member in a state where the corner portion and the corner portion of the bag are positioned and held by covering the corner portion of the bag. That is, since the bag corner is engaged and held at the corner, the skin is held and fixed to the core at the bag corner. And tension | tensile_strength arises in an outer skin by pulling an outer skin in a direction opposite to a bag corner, and a return terminal is fixed to a core in that state. At this time, it is desirable to fix first the terminal on the opposite side diagonally to the bag corner. By doing in this way, both ends of the epidermis can be fixed while preventing wrinkles. Since both ends are already fixed, it is very easy to fix the remaining folded terminals.

  Therefore, when both ends of the core have corners, it is desirable to form the bag corners at both ends so as to correspond to the corners. In this way, by covering the pair of corner portions with the bag corner portions, both ends of the epidermis are held in a tensioned state. Therefore, it is possible to more easily press and hold the core of the folded terminal other than the corner of the bag, and further reduce the burden on the operator's finger.

  Although it is necessary to fix the corner portion of the bag to the core material, the shape of the corner portion is often important in a product in which the core material such as an armrest and the skin are integrated. Therefore, it is desirable that the bag corner is fixed so as to surely follow the shape of the corner. However, in the bag corner, since the two sides sandwiching the corner are folded and joined to each other, the problem is that the rigidity is higher than other terminals and the burden on the operator for fixing to the core is large. is there.

  Therefore, it is desirable to have a convex piece at the bag corner and fix the bag corner to the corner while pulling the convex piece. As a result, the burden on the operator's finger can be greatly reduced. This convex piece can be formed on one or both of the skin terminals corresponding to the two pieces sandwiching the corner. After fixing the bag corner, the convex piece may be removed, or the convex piece may be fixed to the core together with the bag corner.

In the skin terminal fixing method of the present invention, a soft concave mold having an undercut portion is used. The concave mold can be formed by taking a mold using an integrated product in which the core material and the skin are integrated. For example, a concave mold can be formed by pouring resin for molding around an integrated product in which the core material and the skin are integrated, removing the integrated product after reaction and solidification.

  An undercut portion is an at least one peripheral portion of a concave recess when an integral product in which a core material and a skin are integrated is disposed in a concave shape so that the skin faces the concave surface (the bottom surface of the concave portion). The part where the part has advanced inward from the outer periphery of the integrated product. This undercut portion may exist only in a part of the concave shape, or the entire circumference of the concave shape may be an undercut portion. In addition, the length that the undercut part advances to the inside from the outer periphery of the integrated product is within a range shorter than the length to the position where the folding terminal of the skin is fixed, and the range in which the integrated product can be attached to and detached from the undercut unit. It is desirable to make it as long as possible.

  In this fixing method, the laminated body in which the skin and the core material are stacked is placed in the concave mold so that the skin faces the concave surface (the bottom surface of the concave section). At the same time, part or all of the peripheral edge of the laminate is disposed in the undercut portion. Since the concave mold is soft, even if there is an undercut portion around the entire circumference of the concave mold, the laminate can be disposed in the undercut section by elastically deforming the concave mold.

  In the laminated body arranged in a concave shape, the end of the skin is forcibly folded back to the back side of the core material by the undercut part, and the folded terminal of the skin is fixed to the back side of the core material in that state. The Therefore, even if the force which presses and holds the folded terminal against the core is weak, it is sufficient, and the burden on the operator's finger when the terminal is fixed is reduced.

  After the folded terminal of the skin is fixed, the integrated product in which the core material and the skin are integrated is removed from the concave mold. Since the concave mold is soft, even if the integral product interferes with the undercut portion, the integral mold can be easily taken out by the elastic deformation of the concave mold. And the next laminated body is arrange | positioned at a concave type, and it is used for the next fixation.

  The concave Shore A hardness is desirably in the range of 65 to 85. When the Shore A hardness is lower than 65, the strength for holding the laminate is reduced, and the force by which the end of the skin is forcibly folded back to the back side of the core by the undercut portion is weakened. The burden on the operator's finger during pressing may increase. When the Shore hardness is higher than 85, it is difficult to dispose the laminate in a concave shape, and it is difficult to remove the integrated product from the concave shape. The Shore A hardness is particularly preferably in the range of 70-80.

  Even in the fixing method using the concave mold, the skin has a bag corner portion that is folded back at two sides sandwiching the corner portion of the core material, and covers the corner portion and the bag corner portion by covering the corner portion of the bag with the corner portion. It is desirable to arrange in a concave shape while being positioned and held. By doing in this way, positioning with an outer skin and a core material can be performed reliably, and fixation of an outer skin terminal to a corner | angular part can be performed easily.

  As fixing means for fixing the skin to the core material, means such as adhesion and welding can be used, but a tucker that can be fixed at low cost and quickly is particularly preferable. According to the present invention, since the burden on the operator's finger for pressing the folded skin against the core material is reduced, it becomes possible to press the folded skin at a position far from the position where the tucker needle is struck. Will also improve.

Hereinafter, the present invention will be specifically described with reference examples and examples. In this reference example and embodiment, the present invention is used for manufacturing an armrest provided in a door trim of an automobile.

( Reference Example 1 )
FIG. 1 shows a perspective view of the core material used in this reference example , and FIG. 2 shows a perspective view of the skin used in this reference example . Further in FIG. 3 shows a rear surface side perspective view of the armrest obtained by the present embodiment. The core material 1 is formed from polypropylene by injection molding, and reinforcing ribs 10 are formed on the back surface thereof. Further, a boss 11 and a locking claw 12 for mounting to the door trim protrude from the back surface. Further, a plurality of pins 13 for temporarily fixing the skin protrude from the back surface of the core material 1, and similarly, L-shaped projections 14 for temporarily fixing the skin protrude. Corner portions 15 are formed at both ends of the core material 1, respectively.

  The skin 2 is made of a thermoplastic elastomer skin layer and a cushion layer made of slab urethane laminated on the back surface of the skin layer, and is cut into a shape that is slightly larger than the core material 1. The corners 20 formed by sewing the two skins folded back to the back side at positions corresponding to the two sides sandwiching the corner 15 are formed in the portions corresponding to the pair of corners 15, respectively. . From the bag corner portion 20, convex pieces 21 formed at the time of cutting protrude. The skin 2 is provided with a pin hole 22 through which the pin 12 is inserted and a locking hole 23 through which the L-shaped projection 13 is inserted.

  In order to integrate the core material 1 and the skin 2, first, the skin 2 is disposed on the surface of the core material 1. In the skin 2, the back side cushion layer faces the surface of the core material 1. Then, the bag corners 20 at both ends are put on the corners 15 at both ends. At this time, the pair of bag corners 20 of the skin 2 are pulled in substantially opposite directions, and the skin 2 is stretched. Therefore, both ends of the skin 2 are held by the core material 1 by the bag corner portion 20.

  Next, the end of the outer skin 2 other than the bag corner 20 is folded back to the back side of the core material 1, the pin 13 is inserted into the pin hole 22, and the L-shaped protrusion 14 is inserted into the locking hole 23. Temporarily fix 2 to the core material 1. Then, the folded terminal 24 is fixed to the back surface of the core material 1 by tackering.

  Fixing by the tucker is performed at a plurality of locations along the peripheral edge of the core material 1 on the entire circumference. The tucker will be hit while pressing the folded terminal 24 with a finger, but the pair of bag corners 20 are held by the pair of corners 15 at both ends, and are temporarily fixed by the pins 13 and the L-shaped projections 14, The work is easy and the burden on the operator's finger is small. Moreover, since the skin 2 is stretched, wrinkles are prevented from being generated.

  Finally, the bag corners 20 at both ends are tacked. At this time, the bag corner 20 is tacked to the core 1 together with the convex piece 21 while pulling the convex piece 21 to bring the bag corner 20 into close contact with the corner 15. Since the remaining peripheral edge of the skin 2 is already tacked to the core material 1, the force pulling the convex piece 21 is sufficiently transmitted to the bag corner 20, and the bag corner 20 is in close contact with the corner 15 in the state where it is in close contact. Can be stopped. As a result, the bag corner 20 has a sharp shape along the shape of the corner 15 and the design is ensured.

( Reference Example 2 )
This reference example is the same as the reference example 1 except that the concave mold 3 is used and the bag 2 is not formed with the bag corner 20. That is, first, the skin 2 is arranged on the surface of the core material 1, the terminal is folded back to the back surface side of the core material 1, the pin 13 is inserted into the pin hole 22, and the L-shaped protrusion 14 is inserted into the locking hole 23. Then, the skin 2 is temporarily fixed to the core material 1.

  The core material 1 to which the skin 2 is temporarily fixed is disposed in the concave mold 3 as shown in FIGS. 4 and 6. The concave mold 3 whose cross section is shown in FIG. 5 is formed from urethane rubber having a Shore A hardness of 75, and the shape of the concave section 30 is molded using an armrest as a product. The recess 30 is formed with an undercut portion 31 that extends inward from the outer periphery of the armrest when the design surface of the armrest is disposed so as to face the bottom surface of the recess 30.

  The laminated body which consists of the core material 1 to which the skin 2 was temporarily fixed is arrange | positioned so that the peripheral part may engage with the inner side of the undercut part 31. FIG. Since the concave mold 3 is soft, it can be elastically deformed. When the laminated body is pressed toward the concave section 30, the peripheral edge engages the inside of the undercut section 31 by the elastic deformation of the concave mold 3.

  Then, as shown in FIG. 6, the end of the skin 2 is forced to be folded back to the back surface side of the core material 1 by the undercut portion 31, so that the folded terminal 24 is substantially along the back surface of the core material 1. become. Further, on the surface side of the skin 2, the entire circumference is pulled outward and tension is generated. In this state, the folding terminal 24 is tacked to the core material 1, so that wrinkles are prevented and the burden on the operator's finger is greatly reduced.

  After the folding terminal 24 of the skin 2 is tacked all around, the integrated product of the core material 1 and the skin 2 is taken out from the concave mold 3. At this time, the undercut portion 31 interferes with the integrated product, but can be easily taken out by the elastic deformation of the concave mold 3.

( Example 1 )
In this embodiment, with skin 2 the bag corner 20 is formed in the same manner as in Reference Example 1, as shown in FIG. 7, was Tucker stop arranged in the same manner as in Reference Example 2 in a concave 3. In other words, since the pair of bag corners 20 are held at the corners 14 at both ends, a shift between the skin 2 and the core material 1 at the bag corner 20 when the concave corner 3 is disposed is prevented. Then, by fixing the bag corner 20 to the core 1 while pulling the convex piece 21, the shape of the bag corner 20 can be sharpened and the design can be ensured.

  The skin terminal fixing method of the present invention can be used not only for the manufacture of automobile interior parts such as the door trim shown in the embodiments, but also when the chair skin is replaced.

It is the perspective view which looked at the core material used for one reference example from the back surface side. It is the perspective view which looked at the skin used for one reference example from the back side. It is a perspective view of the core material and the skin, which is fixed by a reference example from the back side. In a 2nd reference example , it is a perspective view which shows the state which has arrange | positioned the core material and the skin within a concave mold | type. It is sectional drawing of the concave type used in the 2nd reference example . FIG. 5 is a cross-sectional view corresponding to the line AA of FIG. 4 showing a state in which the core material and the skin are arranged in the concave mold in the second reference example . In a 2nd reference example , it is a perspective view which shows the state which has arrange | positioned the core material and the skin within a concave mold | type.

Explanation of symbols

1: Core material 2: Skin 3: Recessed
15: Corner 20: Bag corner 21: Convex piece
24: Return terminal

Claims (3)

In the skin terminal fixing method of covering the surface of the core material with the skin, and fixing the folded terminal folded back along the peripheral edge of the core material to the back surface side of the core material,
The core material has corners at both ends, and the outer skin is folded at the two sides sandwiching the corners of the core material so that the bag corners joined to each other correspond to the corners of the core material at both ends. Each has
A soft concave mold having an undercut portion is prepared, and the outer skin is a laminate of the outer skin and the core material in which the corner portion of the bag is positioned and held by covering the corner portion of the bag with the corner portion. The folded terminal is disposed in the recessed mold so as to be opposed to the surface of the recessed mold, and the end of the skin is forcibly folded back and held on the back side of the core by the undercut portion. A method for fixing a skin terminal, comprising fixing to the back surface side, and then removing an integrated product of the core material and the skin from the concave mold. The skin terminal fixing method according to claim 1 , wherein the concave mold is a urethane molded body molded from an integral product of the core material and the skin formed in advance. The skin terminal fixing method according to claim 1 or 2 , wherein the concave Shore A hardness is in a range of 65 to 85.

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