JP2019076724A - Armrest and method of manufacturing the same, and mold - Google Patents

Abstract

To prevent an object and the like from making an entry into an installation part.SOLUTION: An armrest 10 comprises: a body part 12 that is constituted by collecting resin foam chips 14; an installation part 18 that is provided in a recessed shape opened on one surface of the body part 12 and in which a functional member 20 is to be installed; and a protection part 26 that is provided at an opening edge of the installation part 18 in the body part 12. The protection part 26 is provided at the opening edge of the installation part 18 adjacent to a principal part 25, on which an arm is to be put, in the body part 12, and set higher in apparent density than the principal part 25.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an armrest whose main body portion is formed of a chip of resin foam, a method of manufacturing the armrest, and a mold for manufacturing the armrest.

  As an armrest, for example, there is one which can be changed to a state in which the armrest is placed on a seat cushion to be an armrest by tilting forward from a state of being accommodated in a recess of a seatback of a rear seat (see, for example, Patent Document 1). Such an armrest has an installation recess formed in the cushioned armrest main body, and a cup holder made of hard resin is fitted and installed in the installation recess so that the cup container can hold the beverage container in an armrest state .

JP 2001-253290 A

  The armrest described above is designed to support the user's arm softly because the armrest body is soft and cushioning. For this reason, there is a possibility that a finger, a thing, etc. may enter between a cup holder installed in an installation crevice, and an armrest main part because an armrest main part bends.

  The present invention has been proposed in view of the above problems relating to the prior art, and has been proposed to suitably solve these problems, and an armrest capable of preventing entry of an object or the like into a space with a functional member installed in an installation part. It is an object of the present invention to provide a method of manufacturing an armrest and a mold for manufacturing an armrest.

In order to overcome the above problems and achieve the intended purpose, the armrest of the invention according to claim 1 of the present application,
A body portion constructed by assembling chips of resin foam;
An installation portion provided on the main body portion in a concave shape that opens on one surface of the main body portion, and in which the functional member is installed;
A protective portion provided on an opening edge of the installation portion adjacent to a main portion on which the arm is placed in the main body portion;
The gist is that the protective portion is configured to have a higher apparent density than the main portion.
According to the invention of claim 1, by providing the protective portion having a high apparent density at the opening edge of the installation portion, the opening edge of the installation portion can be made difficult to bend, and the functional member and the main body installed at the installation portion It is possible to prevent the entry of things etc. between the parts.

In the invention according to claim 2, the boundary between the main portion and the protective portion is provided with a slit derived from the molding of the main body portion so as to open on one surface where the installation portion in the main body portion is open. The main point is that
According to the invention which concerns on Claim 2, a protection part moderately harder than a principal part can be formed.

In the invention concerning Claim 3, it makes it a gist that it is provided corresponding to the part where the above-mentioned protection part is put and fitted in the above-mentioned installation part and the perimeter edge of the above-mentioned functional member is put.
According to the invention which concerns on Claim 3, the outer periphery of the functional member installed in the installation part can be supported by the protection part comparatively difficult to bend.

In the invention which concerns on Claim 4, it makes it a summary to provide the said protection part provided in the range thinner than the thickness of this main-body part from one surface of this main-body part.
According to the invention concerning Claim 4, it can prevent that a main-body part becomes hard too much by formation of a protection part.

In order to overcome the above-mentioned problems and achieve the intended purpose, a method of manufacturing an armrest of the invention according to claim 5 of the present application is:
A method of manufacturing an armrest comprising a main body obtained by molding a chip of resin foam, comprising:
In the mold, the recess extends between the inner mold surface forming the concavely formed installation portion opened on one surface of the main body and the ridge facing the inner mold surface, facing the ridge The chip is packed more than between the outer mold surface forming the surface intersecting the one surface of the main body portion and the ridge portion,
The chip filled in the cavity of the mold is compression molded to form the installation portion, and the opening edge of the installation portion is a protective portion having a higher apparent density than the main portion on which the arm is placed in the main body portion. To form the
According to the invention as set forth in claim 5, the chip can be held by the buttocks to make it easy to fill the chip in the region corresponding to the opening edge of the installation portion, and protection with high apparent density at the opening edge of the installation portion The parts can be provided stably.

In the invention according to claim 6, the gist is that the space between the inner mold surface and the ridge portion is set narrower than the space between the ridge portion and the outer mold surface.
According to the invention of claim 6, the chip can be more easily filled in the region corresponding to the opening edge of the installation portion.

In the invention according to claim 7, the gutter is set to be lower than the outer mold surface.
According to the seventh aspect of the present invention, the tip can be more easily filled in the region corresponding to the opening edge of the installation portion without being disturbed by the buttocks.

The gist of the invention according to claim 8 is to pack a chip harder than a chip to be packed between the outer mold surface and the ridge between the inner mold surface and the ridge.
According to the invention which concerns on Claim 8, the hardness of a protection part can be improved.

In order to overcome the above problems and achieve the intended purpose, the mold of the invention according to claim 9 of the present application is:
A molding die for compression molding a chip of resin foam to produce a main body of an armrest,
A first outer mold surface for molding one surface of the outer surface of the main body;
A second outer mold surface for molding a surface intersecting the one surface of the outer surface of the main body;
An inner mold surface which is raised from the first outer mold surface and which forms a recessed installation portion which is open on one surface of the main body portion;
Between the second outer mold surface and the inner mold surface, the second outer mold surface is disposed closer to the inner mold surface than the second outer mold surface, and faces the inner mold surface from the first outer mold surface The gist of the present invention is that it comprises the buttocks that rise up.
According to the invention as set forth in claim 9, the chip can be held by the buttocks to make it easy to fill the chip in the region corresponding to the opening edge of the installation portion, and protection with a high apparent density at the opening edge of the installation portion The parts can be provided stably.

In the invention according to claim 10, the gutter is formed to be lower than the surface of the second outer mold.
According to the invention of claim 10, the tip can be more easily filled in the region corresponding to the opening edge of the installation portion without being disturbed by the buttocks.

According to the armrest according to the present invention, it is possible to prevent the entry of an object or the like between the functional member installed in the installation portion and the main body.
According to the method for manufacturing an armrest and the mold according to the present invention, it is possible to easily form an armrest capable of preventing entry of an object or the like between itself and a functional member installed in the installation portion.

It is a perspective view showing an armrest concerning an embodiment of the present invention. It is a top view showing an armrest of an embodiment. It is an explanatory view showing a difference of apparent density in an armrest of an embodiment. It is an end elevation broken and shown by the AA line of FIG. It is an end elevation broken and shown by the BB line of FIG. It is explanatory drawing which shows the manufacturing process of the armrest of embodiment, and is before filling a chip | tip. It is an explanatory view showing a manufacturing process of an armrest of an embodiment, and is in a state where a tip is filled. It is an explanatory view showing a manufacturing process of an armrest of an embodiment, and is in a state where a mold is closed. It is explanatory drawing which shows the manufacturing process of the armrest of embodiment, and shows the removal of the obtained armrest.

  Next, an armrest, a method of manufacturing an armrest, and a mold according to the present invention will be described below by way of preferred embodiments with reference to the accompanying drawings.

  The armrest 10 according to the embodiment shown in FIGS. 1 and 2 is installed on the rear seat, and is tiltably supported at the lower portion of the accommodation recess provided on the seatback of the rear seat. The armrest 10 is used by being displaced between a use posture extending forward from the seatback along the seat surface of the seat cushion and a storage posture stored upright in the storage recess along the seatback. In the use position, the armrest 10 is positioned between the occupants sitting on the left and right of the rear seat, and supports the arm of the occupant on the upper surface in the use position. Further, the armrest 10 functions as a backrest of an occupant seated at the center of the rear seat, with the front in the stored position aligned with the front of the seatback. In the following description, the direction of the armrest 10 is referred to with reference to the armrest 10 in the use posture.

  In the armrest 10, a body portion 12 having a cushioning property is configured by assembling a chip 14 (FIG. 6A) of a resin foam. As shown in FIG. 1 and FIG. 2, the main body 12 is a block formed in a substantially rectangular parallelepiped shape whose longitudinal extension extends in the front and rear direction, and the rear portion is rotatably supported around the left and right axes with respect to the seat back Be done. The armrest 10 elastically receives the arm of the occupant on the upper surface in the use posture, and elastically receives the back of the occupant on the lower surface which is the front surface in the storage posture. The armrest 10 covers the main body 12 with a skin material (not shown), and the outer surface is basically composed of the skin material. As the skin material, for example, a synthetic resin such as polyvinyl chloride (PVC), a fabric such as fabric or tricot, or a flexible material such as genuine leather can be adopted.

  As shown in FIGS. 2 and 4, the armrest 10 is provided with an installation portion 18 on which the cup holder (functional member) 20 is installed, in the main body portion 12. The installation portion 18 is formed in a concave shape that opens on the upper surface (one surface) of the main body portion 12 and is provided at a position close to the front end of the main body portion 12. Further, the installation portion 18 extends in the left-right direction of the main body portion 12 and is formed over most of the lateral width of the main body portion 12. The armrest 10 has a wider space between the installation portion 18 and the rear surface of the main body portion 12 than the space between the installation portion 18 and the front surface of the main body portion 12 or between the installation portion 18 and the side surface of the main body portion 12 . In the armrest 10, a portion (main portion 25 (see FIG. 3)) on which the arm of the occupant is placed is set in a region on the rear side of the installation portion 18 in the main body portion 12.

  As shown in FIG. 4, the cup holder 20 includes a box portion 20a that opens upward, and a weir portion 20b formed to extend outward at the opening edge of the box portion 20a. The cup holder 20 is made of, for example, a resin molded product such as polypropylene (PP) or acrylonitrile butadiene styrene copolymer resin (ABS). The cup holder 20 is installed by fitting the box portion 20 a to the inside of the installation portion 18 and overlapping the collar portion 20 b on the upper surface of the main body portion 12 which constitutes the opening edge of the installation portion 18. The armrest 10 is configured to draw the skin material wound around the main body portion 12 into the inside of the installation portion 18, and sandwich the skin material between the main body portion 12 and the cup holder 20.

  As shown in FIGS. 2 and 4, the armrest 10 is provided with reinforcing members 22 and 24 embedded and installed in the main body 12. As the reinforcing members 22 and 24, those made of a synthetic resin or metal having rigidity are adopted, and configured to be able to receive a load applied to the armrest 10. The armrest 10 of the embodiment includes a first reinforcing member 22 provided with a hinge portion connected to the seat back, and a second reinforcing member 24. The second reinforcing member 24 has a rear portion connected to the first reinforcing member 22 installed at the rear portion of the main body portion 12, and a front portion is formed in a frame shape surrounding the setting portion 18.

  As shown in FIGS. 4 and 5, the armrest 10 is configured such that the apparent density of the main body portion 12 composed of the tip 14 differs depending on the part. The main body 12 has an apparent density between the protection portion 26 provided corresponding to the opening edge of the installation portion 18 and the main portion 25 provided corresponding to the place where the occupant's arm is placed. It is configured differently. Specifically, the apparent density of the protection portion 26 is set higher than that of the main portion 25. The protective portion 26 may be provided at a minimum at the rear opening edge adjacent to the main portion 25 among the four opening edges of the installation portion 18. The protection portion provided on the rear opening edge of the installation portion 18 adjacent to the main portion 25 (referred to as the rear protection portion 26a in the case of distinction) is the installation portion 18 of the outer edge of the main body portion 12 surrounding the installation portion 18. It will be disposed between the opening edge of and the outer edge farthest away. In other words, in the embodiment, the installation portion 18 is disposed close to the front side of the main body portion 12 and the main portion 25 is set on the rear side of the installation portion 18. Between the rear edge of the portion 12 and the rear protection portion 26 a is provided. Further, the main body 12 is provided along a protective portion provided along the front opening edge of the installation portion 18 (referred to as a front protective portion 26b in the case of distinction) and left and right opening edges of the installation portion 18 respectively. It has a protected portion (referred to as a lateral protective portion 26c in the case of distinction). Thus, in the main body portion 12 of the embodiment, the entire periphery of the opening edge of the installation portion 18 is surrounded by the protection portion 26.

  As shown in FIG. 3, the protection portion 26 is provided corresponding to the upper surface portion of the main body portion 12 on which the hook portion 20 b constituting the outer peripheral edge of the cup holder 20 which is installed by being fitted to the installation portion 18. There is. The protective portion 26 is preferably provided in the range of 10 mm to 40 mm along the upper surface of the main body 12 from the opening edge of the installation portion 18, and more preferably 20 mm to 30 mm. When the distance between one side of the opening edge of the installation portion 18 and the outer edge of the main body 12 aligned with the one side is narrower than the upper limit, the protective portion 26 starts with one side of the main body 12 like the lateral protection 26c. It is preferable to provide over the outer edge.

  As shown in FIGS. 4 and 5, the protection portion 26 is formed over a required range downward from the top surface of the main body portion 12. The rear protection portion 26 a and the front protection portion 26 b are provided in a range thinner than the thickness between the upper surface and the lower surface of the main body portion 12. The lateral protection portion 26 c is provided over the entire thickness from the upper surface to the lower surface of the main body portion 12. Here, when the protective portion 26 is provided in a range thinner than the thickness of the main body portion 12 as in the rear protective portion 26 a and the front protective portion 26 b, the protective body 26 is protected in the range of 5 mm to 40 mm downward from the upper surface of the main body portion 12 Preferably, the portion 26 is provided. When the distance between one side of the opening edge of the installation portion 18 and the outer edge of the main body 12 aligned with the one side is wider than the upper limit, the protective portion 26 may be the main body 12 as the rear protective portion 26a and the front protective portion 26b. It is preferable to provide it thinner than the thickness of. When the distance between one side of the opening edge of the installation portion 18 and the outer edge of the main body 12 aligned with the one side is narrower than the upper limit, the protective portion 26 is viewed from the upper surface of the main body 12 as in the lateral protective portion 26c. It is preferable to provide over the entire thickness to the lower surface.

The body portion 12 is preferably set the apparent density of the main portion 25 in the range of ^{0.04g / cm 3 ~0.12g / cm 3} , more preferably 0.05g ^/ cm 3 ~0.10g ^/ cm It is ^three . The main body portion 12, the apparent density of the high protection portion 26 than the apparent density of the main portion 25 ^is preferably set in the range of ^{0.08g / cm 3 ~0.40g / cm 3} , more preferably 0 It is .10 g / cm ^{3 to} 0.30 g / cm ³ . The main body portion 12 is preferable because the armrest 10 can be reduced in weight while maintaining the main portion 25 and the protective portion 26 at an appropriate hardness when the main portion 25 and the protective portion 26 fall within the above-described apparent density range. The main body portion 12 preferably has a hardness (hardness at 25% compression defined in JIS K 6400-2 (D method)) of the main portion 25 in the range of 60 N to 240 N, more preferably 80 N to 200 N Range. The hardness of the protective portion 26 of the main body portion 12 is preferably in the range of 100 N to 350 N, and more preferably in the range of 120 N to 270 N. Thus, the main body portion 12 is configured such that the protection portion 26 is harder than the main portion 25. It is preferable that the main portion 25 has the above-described range of hardness because it can obtain an appropriate function of receiving an arm, such as the cushioning property of the main portion 25. In addition, when the protective portion 26 is in the above-described range of hardness harder than the main portion 25, appropriate action such as preventing the articles from entering under the heel portion 20b of the cup holder 20 and supporting the heel portion 20b Is preferable because it can be obtained. The main portion 25 and the protective portion 26 may have the same apparent density (hardness) as a whole, or may have different apparent density (hardness) depending on the portion.

Apparent density of the body portion 12 ^is preferably in the range of ^{0.05g / cm 3 ~0.15g / cm 3} , more preferably ^{0.06g / cm 3 ~0.11g / cm 3} . It is preferable that the apparent density of the entire main body portion 12 is in the above-described range, because the weight reduction of the armrest 10 and the formation of appropriate hardness of the main portion 25 and the protective portion 26 can be compatible. If the apparent density of the main body portion 12 is set to be smaller than the lower limit value, it will be difficult to obtain the protective portion 26 of appropriate hardness, and if the apparent density of the main body portion 12 is larger than the upper limit value Not so desirable. Thus, in the main body portion 12, the weight of the main body portion 12, the hardness of the main portion 25 and the hardness of the protective portion 26 are correlated, and it is important to set so as to satisfy all of them. .

Body portion 12, the difference in the apparent density of the protective portion 26 and the main unit 25 (the apparent density of the protective portion 26 - apparent density of the main portion 25) is in ^the range of 0.015g / cm ³ ~0.15g / cm 3 it is preferably, more preferably ^{0.02g / cm 3 ~0.13g / cm 3} . Further, in the main body portion 12, the difference in hardness between the protective portion 26 and the main portion 25 (the hardness of the protective portion 26-the hardness of the main portion 25) is preferably in the range of 30N to 200N, more preferably Is 40N to 160N. It is preferable that the main body portion 12 has the physical property difference between the protective portion 26 and the main portion 25 as described above, because the significance of providing the main portion 25 and the protective portion 26 having different physical properties is remarkable.

  As shown in FIGS. 4 and 5, in addition to the protection portion 26 and the main portion 25, the main body portion 12 is provided with a reinforcement portion 28 provided corresponding to the outer edge of the main body portion 12. The reinforcing portion 28 is set to have a higher apparent density than the main portion 25. The reinforcements 28 are provided at the front edge, the rear edge and the left and right side edges of the main body 12. The protective portion 26 strengthens the outer peripheral edge of the main body 12 while the protective portion 26 strengthens the opening edge of the installation portion 18. Since the space between the front opening edge of the mounting portion 18 and the front edge of the main body 12 is relatively narrow, the reinforcing portion 28 provided on the front edge of the main body 12 and the front protective portion 26 b are integrated. Similarly, the reinforcing portion 28 provided at the left side edge of the main body portion 12 is integrated with the lateral protection portion 26 c provided at the left opening edge of the installation portion 18 and provided at the right side edge of the main body portion 12 The reinforced portion 28 is integrated with a lateral protection portion 26 c provided at the opening edge on the right side of the installation portion 18. The reinforcing portion 28 is provided at the outer edge of the main body portion 12 over the entire thickness from the upper surface to the lower surface of the main body portion 12.

The body portion 12 has an apparent density of higher reinforcement portion 28 than the apparent density of the main portion 25 ^is preferably set in the range of ^{0.08g / cm 3 ~0.40g / cm 3} , more preferably 0. it is ^{10g / cm 3 ~0.30g / cm 3} . The hardness of the reinforcing portion 28 of the main body portion 12 is preferably in the range of 100 N to 350 N, and more preferably in the range of 120 N to 270 N. Thus, the main body 12 is configured such that the reinforcing portion 28 is harder than the main portion 25. The protective portion 26 and the reinforcing portion 28 may have the same or different apparent density and hardness, and in the embodiment, the protective portion 26 and the reinforcing portion 28 have the same apparent density and hardness.

  Although the boundaries between the main portion 25 and the protection portion 26 and the reinforcement portion 28 are clearly shown in the drawing for the convenience of description, the apparent density gradually changes between the main portion 25 and the protection portion 26. Similarly, the apparent density may gradually change between the main portion 25 and the reinforcing portion 28.

  The body portion 12 is provided with the installation portion 18, the main portion 25, the protective portion 26, and the reinforcing portion 28 by molding using a single mold 30 (see FIG. 7). As shown in FIG. 4, at the boundary between the main portion 25 and the rear protection portion 26a, a slit 12a derived from the molding of the main body portion 12 so as to open on the upper surface where the installation portion 18 in the main body portion 12 opens. Is provided. The slit 12 a is a bottomed groove having a narrow opening width before and after the formation of the main body 12 by molding with a collar 44 (see FIG. 7) described later. Then, the physical properties (apparent density and hardness) of the rear protection portion 26a and the main portion 25 change non-linearly across the slit 12a.

  Next, the mold 30 for manufacturing the armrest 10 will be described. As shown in FIG. 6, the mold 30 has a lower mold 32 having a mold surface that is uneven according to the shape of the top surface, the front and back, and the side surface of the main body 12 including the installation portion 18. And an upper mold 34 having a corresponding mold surface. The mold 30 is configured such that the upper mold 34 and the lower mold 32 can be opened and closed relative to each other. As shown in FIG. 8, in the mold 30, a cavity 36 corresponding to the shape of the main body 12 is defined between the upper mold 34 and the lower mold 32. The mold 30 further includes a water vapor supply means (not shown) capable of supplying water vapor to the cavity 36 through a supply portion (not shown) provided on the lower mold 32 and an exhaust provided on the upper mold 34. It is possible to exhaust from a part (not shown). In addition, the shaping | molding die 30 shape | molds the main-body part 12 of the armrest 10 in the state which turned up and down.

  As shown in FIG. 6, the lower die 32 stands up so as to intersect the first outer mold surface 38 for molding the upper surface of the main body 12 and the first outer mold surface 38. And a second outer mold surface 40 for forming the intersecting surfaces). In the lower mold 32, the first outer mold surface 38 is the bottom of the cavity 36, and the second outer mold surface 40 is the side of the cavity 36. Further, the lower mold 32 is provided with an inner mold surface 42 for molding an installation portion 18 which is formed in a concave shape and opens on the upper surface of the main body 12. The inner mold surface 42 rises from the first outer mold surface 38 and is disposed inside the second outer mold surface 40. The lower mold 32 is formed by forming a front surface of the main body 12 between a rear second outer mold surface 40 a for molding the rear surface of the main body 12 and a rear inner mold surface 42 a for molding the rear surface of the installation portion 18. It is wider than between the outer mold surface 40 b and the front inner mold surface 42 b for molding the front surface of the mounting portion 18. The lower mold 32 is a horizontal inner mold surface between the front second outer mold surface 40b and the front inner mold surface 42b for molding the lateral second outer mold surface 40c for molding the side surface of the main body 12 and the side surface for the mounting portion 18 It is wider than the one between 42c.

  As shown in FIG. 6, the lower mold 32 is disposed between the rear second outer mold surface 40a and the rear inner mold surface 42a, and stands up from the first outer mold surface 38 so as to face the rear inner mold surface 42a. A buttock 44 is provided. The collar portion 44 is disposed at a position closer to the rear inner mold surface 42a than the rear second outer mold surface 40a, and between the rear inner mold surface 42a and the collar portion 44, the collar portion 44 and the rear second outer mold surface It is narrower than 40a. The lower die 32 is configured to be able to pack the chip 14 at a higher density between the rear inner mold surface 42 a and the ridge portion 44 than between the ridge portion 44 and the rear second outer molding surface 40 a.

  The ridge portion 44 is preferably in the form of a plate having a thickness in the range of 1 mm to 5 mm, and is arranged along the rear inner mold surface 42 a so as to extend in the left-right direction. The ridge portion 44 is preferably disposed in the range of 10 mm to 40 mm away from the rear inner mold surface 42 a, more preferably 20 mm to 30 mm. If the ridge portion 44 is disposed closer to 10 mm with respect to the rear inner mold surface 42a, it becomes difficult to perform the filling operation of the tip 14 between the ridge portion 44 and the rear inner mold surface 42a. In addition, when the ridge portion 44 is disposed to be separated from the rear inner mold surface 42a by more than 40 mm, it becomes difficult to fill the tip 14 in an amount satisfying the required apparent density between the ridge portion 44 and the rear inner mold surface 42a. As shown in FIG. 6B, the collar portion 44 is disposed apart from the lateral second outer mold surface 40c on the left and right, and a gap is formed between the edge of the collar portion 44 and the lateral second outer mold surface 40c. It is supposed to be. In addition, it is preferable to separate 25 mm or more between the edge of the collar part 44 and the horizontal 2nd outer mold surface 40c.

  As shown in FIG. 6A, the ridge portion 44 is formed lower than the second outer mold surface 40 and the rear inner mold surface 42a. When the mold 30 is closed, a gap is formed between the top of the ridge 44 and the mold surface of the upper mold 34. The ridge portion 44 preferably rises from the first outer mold surface 38 at a height of 5 mm to 40 mm, more preferably 20 mm to 30 mm. When the ridge portion 44 is set to be higher than 40 mm from the first outer mold surface 38, it becomes difficult to perform the filling operation of the tip 14 between the ridge portion 44 and the rear inner mold surface 42a. Further, when the rising height of the ridge portion 44 from the first outer mold surface 38 is smaller than 5 mm, the tip 14 is filled between the ridge portion 44 and the rear inner mold surface 42a in an amount satisfying the required apparent density. It becomes difficult to do.

Next, a method of manufacturing the armrest 10 will be described with reference mainly to FIGS. First, the chip 14 is supplied into the lower mold 32 (see FIG. 6A). An adhesive is applied to the chip 14 in advance. As the adhesive, it is possible to use a moisture-curable adhesive that is cured by water vapor such as polyol, toluene diisocyanate (TDI), dichloromethane or the like. The tip 14 is preferably a polyurethane foam. The size of the chip 14 may be in the range of 3 mm to 8 mm. For example, as the tip 14, a slab foam product or a foam molded product made of flexible polyurethane foam can be used after being introduced into a crusher and crushed. Such flexible foams, apparent density ^is preferably in the range of ^{0.025g / cm 3 ~0.070g / cm 3} , more preferably 0.028g ^/ cm ³ ~0.05g ^/ cm 3 It is a range. Moreover, as a flexible foam, it is preferable that hardness is the range of 110N-480N, More preferably, it is the range of 120N-250N. Further, although not shown in FIGS. 6 to 8, reinforcements 22 and 24 to be inserted into the main body 12 are installed in the lower mold 32 at an appropriate timing before or during the supply of the chip 14.

  As shown in FIG. 7, when the chip 14 is supplied to the lower mold 32, the ridge portion 44 to be the main portion 25 and the rear portion 44 are formed between the ridge portion 44 to be the rear protection portion 26 a and the rear inner mold surface 42 a. More chips 14 are packed so as to be denser than that between the two outer mold surfaces 40a. Similarly, on the front side of the front inner mold surface 42b to be the front protection part 26b and on the lateral side of the horizontal inner mold surface 42c to be the horizontal protection part 26c, many chips are denser than the area corresponding to the main part 25 Stuff 14 Also, along the square second outer mold surface 40, more chips 14 are packed so as to have a higher density than the area corresponding to the main portion 25. Note that, in FIG. 7, the amount of packing of the chips 14 is indicated by the lightness and darkness of the color, and the chips 14 are more packed than the light-dark parts.

  After the chip 14 is supplied to the lower mold 32, the lower mold 32 and the upper mold 34 are closed, steam is supplied to the cavity 36 by the water vapor supply means, and the adhesive applied to the chip 14 is cured (see FIG. 8). As described above, by curing the adhesive while compression-molding the chip 14, the compression-molded chip 14 adheres, and the above-mentioned main body portion 12 whose apparent density is adjusted according to the portion is formed. Then, the main body 12 is taken out of the mold 30 (see FIG. 9), and the armrest 10 is obtained through necessary processing such as attaching a skin material.

  The armrest 10 can make the opening edge harder to bend as compared with the main portion 25 supporting the arm by the protection portion 26 provided on the opening edge of the installation portion 18 in the main body portion 12. Thus, it is possible to prevent an accessory such as a finger or a coin from entering between the installation portion 18 and the cup holder 20 installed in the installation portion 18 due to the opening edge of the installation portion 18 being deformed by pressing or the like. it can. In particular, although the rear opening edge of the installation portion 18 is adjacent to the cushioning main portion 25, since the rear protection portion 26 a is provided corresponding to the rear opening edge, the rear protection portion 26 a Invasion of the main part 25 into the installation part 18 can be prevented.

  In order to provide the slit 12a derived from the molding of the main body 12 so that the slit 12a derived from the molding of the main body 12 is opened at the boundary between the main part 25 and the rear protection part 26a, The collar 44 is required to form the That is, when the main body portion 12 is molded, the filling amount of the chip 14 can be easily changed in the region corresponding to the rear protection portion 26 a and the region corresponding to the main portion 25 by using the flange portion 44. Therefore, by packing many chips 14 in the area corresponding to the rear protection portion 26a to increase the apparent density, the rear protection portion 26a that is appropriately harder than the main portion 25 can be formed.

  The armrest 10 is provided on the upper surface of the main body portion 12 so that the protection portion 26 is placed on the cap portion 20b of the cup holder 20. Can support. Thereby, the cup holder 20 can be installed at an appropriate position with respect to the main body 12, and when the beverage is stored in the box portion 20a, the beverage can be stably held.

  In the armrest 10, a rear protection portion 26a and a front protection portion 26b are provided in a range thinner than the upper and lower thicknesses of the main body portion 12 from the upper surface of the main body portion 12. Thus, the formation of the rear protection portion 26a and the front protection portion 26b having a relatively high apparent density can prevent the main body portion 12 from becoming too hard. In particular, since the rear protection portion 26a is provided next to the main portion 25 on which the occupant mounts the arm, the rear protection portion 26a is not formed over the entire thickness of the main body portion 12 so that the main portion 25 is suitable. An adverse effect on cushioning can be suppressed.

  According to the manufacturing method and the molding die 30, the ridge portion 44 is provided to face the rear inner mold surface 42a forming the rear surface of the installation portion 18, and the rear inner mold is provided between the rear inner mold surface 42a and the ridge portion 44. A space narrower than the space between the surface 42 a and the rear second outer mold surface 40 a facing the rear inner mold surface 42 a is formed. Since the chip 14 is filled in a relatively narrow space partitioned between the rear inner mold surface 42 a and the ridge portion 44, the chip 14 can be easily pushed to be compressed. Further, the ridge portion 44 can prevent the compressed and packed chips 14 from being separated. In this manner, since the required amount of chips 14 can be filled in the area corresponding to the rear opening edge of the installation portion 18, a relatively hard rear protection is provided next to the main portion 25 where cushioning is required. The portion 26a can be stably and easily formed with targeted physical properties.

  According to the manufacturing method and the molding die 30, the collar portion 44 is disposed at a position closer to the rear inner mold surface 42a than the rear second outer mold surface 40a, and the collar portion 44 and the rear second outer mold surface 40a The gap between the ridge portion 44 and the rear inner mold surface 42a is set narrower than the gap. This makes it easier to pack more chips 14 between the ridge 44 and the rear inner mold surface 42a than between the ridge 44 and the rear second outer mold surface 40a, and makes the relatively hard rear protection portion 26a It can be stably and easily formed with targeted physical properties.

  According to the manufacturing method and the molding die 30, since the ridge portion 44 is lower than the second outer mold surface 40, when the chip 14 is packed between the ridge portion 44 and the rear inner mold surface 42a, The part 44 is less likely to get in the way. Therefore, even if the gap between the ridge portion 44 and the rear inner mold surface 42a is narrow, the chip 14 can be easily packed.

Next, the main body of the example and the comparative example was molded with the same shape and manufacturing method as the above-mentioned embodiment, and the apparent density and hardness of the rear protection part and the main part in the obtained main body were measured. The mold used for molding the main body has a cavity volume of 12120 cm ³ . Also, in the lower mold of the mold for molding the main body of the embodiment, a ridge of 2 mm in thickness rises 30 mm from the first outer mold surface at a position separated by 30 mm from the rear inner mold surface. Provided in On the other hand, in the lower mold of the mold for molding the main body of the comparative example, no ridge is provided. The chips are obtained by crushing a slab foam product made of flexible polyurethane foam into a crusher, and the size thereof is in the range of 3 mm to 8 mm. A region corresponding to the rear protection portion (between the rear inner mold surface and the ridge portion: an example) and a region corresponding to the main portion (between the ridge portion and the rear second outer mold surface: an embodiment) The apparent density and hardness of the chips to be filled are as shown in Tables 1 and 2. Moreover, about the Example and the comparative example, the filling amount of the chip | tip to a cavity is as showing in Table 1 and Table 2. FIG. The apparent density and the filling factor in Tables 1 and 2 are calculated as follows.
Filled apparent density = fill weight of all loaded tips / volume of cavity Fill factor = volume of all loaded tips / volume of cavity

The evaluation of the filling amount of the chip was “o” when the apparent filling density was in the range of 0.05 g / cm ^{3 to} 0.15 g / cm ³ , and “x” when it was out of this range. In particular, when the packing apparent density is in the range of 0.06g ^/ cm ³ ~0.11g ^/ cm 3 is evaluated as "◎". Incidentally, the range of “o” corresponds to the range of the filling weight of the chip 600 g to 1800 g for the cavity of volume 12120 cm ³ , and the range of “o” corresponds to the range of the filling weight of the chip 700 g to 1300 g . Table 1 and Table 2 show the evaluation of the chip filling amount.

  A 30 mm square block-like test piece was cut out from the rear protection part of the obtained main body part, the weight of this test piece was measured to calculate the apparent density, and the hardness was measured. A 30 mm square block-like test piece was cut out from the main part of the obtained main body, and the weight of this test piece was measured to calculate the apparent density and to measure the hardness. In addition, hardness is the hardness at the time of 25% compression measured based on JISK6400-2 (D method). The results are shown in Tables 1 and 2.

Evaluation of the apparent density of the main unit, when the apparent density is in the range of 0.04g ^/ cm ³ ~0.12g ^/ cm 3 and The symbol "", and the case that outside this range as "×". In particular, when the apparent density is in the range of 0.05 g / cm ^{3 to} 0.10 g / cm ³ , it is evaluated as “◎”. In the evaluation of the hardness of the main part, when the hardness is in the range of 60 N to 240 N is "O", and when it is out of this range is "X". In particular, when the hardness is in the range of 80 N to 200 N, it is evaluated as “◎”. The results are shown in Tables 1 and 2.

Evaluation of the apparent density of the rear protection portion, when the apparent density is in the range of 0.08g ^/ cm ³ ~0.40g ^/ cm 3 and The symbol "", was when outside this range as "×" . In particular, when the apparent density is in the range of 0.10g ^/ cm ³ ~0.30g ^/ cm 3 is evaluated as "◎". Evaluation of the hardness of a back protection part made "(circle)" when hardness exists in the range of 100 N-350 N, and set it as "x" when it remove | deviates from this range. In particular, when the hardness is in the range of 120 N to 270 N, it is evaluated as “◎”. The results are shown in Tables 1 and 2.

Evaluation of the difference between the apparent density of the rear protective portion and the main portion, when the difference between the apparent density is in the range of 0.015g ^/ cm ³ ~0.15g ^/ cm 3 and The symbol "", outside this range The time when you In particular, when the difference between the apparent density is in the range of 0.02g ^/ cm ³ ~0.13g ^/ cm 3 is evaluated as "◎". The evaluation of the difference in hardness between the rear protection part and the main part was made “O” when the difference in hardness was in the range of 30 N to 200 N, and “X” when out of this range. In particular, when the hardness difference is in the range of 40N to 160N, it is evaluated as "「 ". The results are shown in Tables 1 and 2.

  In the comprehensive evaluation, the case where all three indexes of the chip filling apparent density, the hardness of the main part and the hardness of the post protection part are “◎” is “◎”, and any of the three indexes is “× If there is no “O” and there is only one “O”, “O” is assumed. If one or more of the three indexes of the apparent filling density of the chip, the hardness of the main part, and the hardness of the post protection part are "X", the overall evaluation is "X". The results are shown in Tables 1 and 2.

  As can be seen from Examples 1 to 7 shown in Table 1, the presence of the ridges makes it possible to increase the apparent density and hardness of the rear protection portion with a relatively small filling apparent density. Moreover, according to Examples 1-7, it can confirm that the difference of the hardness of a principal part and the hardness of a back protection part can be enlarged. Thus, although the main body portion of the embodiment is lightweight as a whole, the rear protection portion having appropriate hardness required as reinforcement and the main portion having appropriate flexibility required as arm rest are adjacent to each other. It is understood that it is formed. As in Comparative Examples 1 and 2, if there is no ridge portion, even after molding the main body portion with the filling apparent density equivalent to that of the example, it is not possible to obtain a post-protection portion of appropriate hardness. Further, as in Comparative Examples 3 and 4 in which there is no ridge portion, it is possible to make the back protection portion hard by increasing the filling amount of the chip very much, but in this case the body portion becomes heavy, There is a problem that the main part becomes too hard. And according to Comparative Examples 1-4, it turns out that the difference of the hardness of a principal part and the hardness of a back protection part becomes small, without a ridge.

  As shown in Example 7 of Table 1, the presence of the buttocks results in an area corresponding to the rear protection section (between the rear inner mold surface and the buttocks) and an area corresponding to the main section (the buttocks and the back section). It can be seen that chips with different physical properties (apparent density and hardness) can be distributed and filled between the second outer mold surface). The back protection part can be made harder by filling the chip corresponding to the back protection part with a chip harder than the chip filled in the area corresponding to the main part. By doing this, it is possible to improve the hardness of the rear protection part without increasing the weight of the main body part and preventing the main part from becoming too hard.

(Modification example)
For example, the configuration may be changed as follows.
(1) In the embodiment, the cup holder is mentioned as a functional member installed in the installation section, but the present invention is not limited to this, and other components such as an accessory box such as a coin box or an electrical component such as a switch box may be used. .
(2) In the embodiment, the collar portion is formed of a single plate-like body. However, the present invention is not limited to this. A plurality of collar portions may be arranged in series. When arranging a plurality of ridges, it is preferable to set a distance between adjacent ridges to 10 mm or less.
(3) The present disclosure is applicable not only to the armrest installed on the rear seat but also to the armrest installed on the front seat and the door.
(4) The protective portion is not limited to the embodiment in which the whole is configured with the same density and hardness, and physical properties such as density and hardness may be changed depending on the portion.
(5) The reinforcing portion is not limited to the embodiment in which the whole is formed with the same density and hardness, and physical properties such as density and hardness may be changed depending on the portion. For example, as a reinforcement portion, a special reinforcement portion provided corresponding to a portion where strength is particularly required in the vicinity of a spindle or hinge in the main body portion and a general reinforcement portion other than the special reinforcement portion are provided. Alternatively, the apparent density may be set higher than that of the general reinforcement portion. For example, the apparent density of the general reinforcing portion such as ^{0.08g / cm 3 ~0.15g / cm 3} , to set the apparent density of the special reinforcing portions ^{0.15g / cm 3 ~0.40g / cm 3} , as appropriate Changes are possible.
(6) A tip with different hardness may be used according to the part of the main body. For example, when molding the main body, it is possible to use a chip that is packed between the inner mold surface and the ridge (region corresponding to the protective portion) and between the outer molding surface and the ridge (region corresponding to the main part) It is good to stuff hard chips too. By doing this, the hardness of the obtained protective portion can be improved.

10 arm rests, 12 body parts, 12a slits, 14 tips, 18 installation parts,
20 cup holder (functional member), 25 main part, 26 protection part, 26a rear protection part,
30 molds, 36 cavities, 38 first outer mold surface, 40 second outer mold surface,
40a rear second outer mold surface (outer mold surface), 42 inner mold surface, 42a rear inner mold surface (inner mold surface),
44 buttocks

Claims (10)

A body portion constructed by assembling chips of resin foam;
An installation portion provided on the main body portion in a concave shape that opens on one surface of the main body portion, and in which the functional member is installed;
A protective portion provided on an opening edge of the installation portion adjacent to a main portion on which the arm is placed in the main body portion;
The armrest characterized in that the protective portion has a higher apparent density than the main portion.   The boundary between the main portion and the protective portion is provided with a slit derived from molding of the main body portion so as to open on one surface where the installation portion in the main body portion is open. Armrest.   The armrest according to claim 1 or 2, wherein the protective portion is provided corresponding to a portion where the outer peripheral edge of the functional member to be installed by being fitted to the installation portion.   The armrest according to any one of claims 1 to 3, wherein the main body portion includes the protective portion provided in a range thinner than a thickness of the main body portion from one surface of the main body portion. A method of manufacturing an armrest comprising a main body obtained by molding a chip of resin foam, comprising:
In the mold, the recess extends between the inner mold surface forming the concavely formed installation portion opened on one surface of the main body and the ridge facing the inner mold surface, facing the ridge The chip is packed more than between the outer mold surface forming the surface intersecting the one surface of the main body portion and the ridge portion,
The chip filled in the cavity of the mold is compression molded to form the installation portion, and the opening edge of the installation portion is a protective portion having a higher apparent density than the main portion on which the arm is placed in the main body portion. A method of manufacturing an armrest characterized in that:   The method for manufacturing an armrest according to claim 5, wherein a space between the inner mold surface and the ridge portion is set narrower than a space between the ridge portion and the outer mold surface.   The manufacturing method of the armrest of Claim 5 or 6 in which the said collar part is set lower than the said outer mold | type surface.   The manufacturing method of the armrest according to any one of claims 5 to 7, wherein a chip harder than a chip to be packed between the outer mold surface and the ridge portion is packed between the inner mold surface and the ridge portion. . A molding die for compression molding a chip of resin foam to produce a main body of an armrest,
A first outer mold surface for molding one surface of the outer surface of the main body;
A second outer mold surface for molding a surface intersecting the one surface of the outer surface of the main body;
An inner mold surface which is raised from the first outer mold surface and which forms a recessed installation portion which is open on one surface of the main body portion;
Between the second outer mold surface and the inner mold surface, the second outer mold surface is disposed closer to the inner mold surface than the second outer mold surface, and faces the inner mold surface from the first outer mold surface And a ridge portion that rises up as a mold. The mold according to claim 9, wherein the ridge portion is formed lower than the second outer surface.

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