JP2004358916A - Foaming mold for pad of seat and manufacturing method for pad of seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it easy to mount a reinforcing fabric on a foaming mold so as to make the same hardly detachable at the time of mold clamping but easily detachable after foam molding, in manufacturing the pad of a seat having the reinforcing fibric integrated with the back surface thereof. <P>SOLUTION: In the foaming mold 20 for manufacturing the pad 10 of the seat having the reinforcing fabric 14 integrated with the back surface thereof, a mounting pin 32 protruded from the inner surface of a mold in order to mount the reinforcing fabric 14 in a cavity 28 is constituted of an axially extending columnar body part 34 having an almost constant thickness, a root part 36 having a diameter smaller than that of the columnar body part and a tapered leading end part 38, and a stepped part 40 is provided between the columnar body part 34 and the root part 36. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of manufacturing a seat pad used for a vehicle or furniture seat and a foaming mold used for the method.
[0002]
[Prior art]
Conventionally, for example, in a cushion pad for an automobile seat, a reinforcing cloth such as a felt or a coarse blanket is integrally provided as a backing material on the back surface of the pad in order to suppress damage and abnormal noise caused by friction with a seat frame. They are often stacked. Such a reinforcing cloth is generally mounted on an upper mold via a mounting pin provided on the upper mold, and is injected and foamed by injecting a foaming material into a lower mold to be laminated and integrated on the back surface of the pad body which is a foam. (See Patent Document 1 below).
[0003]
As described above, as a mounting pin for mounting the reinforcing cloth on the foam molding die, it is required that the mounting pin is easy to be mounted and hard to be detached when the mold is closed, but is easily detached after foam molding. Various attempts have been made to achieve this, but no satisfactory one has been obtained so far.
[0004]
FIG. 6 shows an example of a conventional mounting pin 100. The mounting pin 100 protruding from the mold 110 is formed from a column-shaped root 101 and gradually from the root 101 in order to facilitate mounting and easy removal. The body 102 has an inverted tapered body 102 inclined so as to have a larger outer diameter, and a tapered tip 103 tapered toward the tip. In this case, as shown in FIG. 6A, at the time of mounting, the reinforcing cloth 120 can be easily mounted by pressing the reinforcing cloth 120 against the mounting pin 100 and penetrating the reinforcing pin 120. However, as shown in FIG. At the time of closing, it may come off from the mounting pin 100 and the reinforcing cloth 120, leading to poor molding.
[0005]
The conventional mounting pin 100 has a protrusion height h of about 30 mm and a maximum diameter d of about 7 to 8 mm.
[0006]
By the way, when the reinforcing cloth is mounted on the foaming mold using the mounting pins in this way, depending on the shape of the product, the reinforcing cloth may not easily reach the mounting pins during the mounting work, and for a part that cannot be visually confirmed by an operator. However, since it is necessary to groping and mounting, there is a case where a positional shift occurs at the time of mounting, and a detachment or a positional shift occurs after mounting. Alternatively, when the upper mold is opened after the foam molding or when the product is removed from the product, the reinforcing pin may be caught by the mounting pin and may be broken.
[0007]
Patent Document 2 below discloses a method in which a permanent magnet is provided in a foaming mold, a magnetic member is provided in a reinforcing cloth, and the magnetic member is magnetically attracted to a permanent magnet in the foaming mold to form a reinforcing cloth in a foaming mold. However, when the reinforcing cloth is mounted only by such magnetic attraction, there is a problem that the reinforcing cloth is likely to be displaced as a whole due to the momentum when the mold is closed.
[0008]
[Patent Document 1] Japanese Patent Application Laid-Open No. 9-123192
[Patent Document 2] Japanese Patent Application Laid-Open No. 2002-120236
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and satisfies the requirement that the reinforcing cloth is easy to be attached, and that it is difficult to come off when closing the mold, but is easy to come off after foam molding. An object of the present invention is to provide a foaming mold having a mounting pin that can be used.
[0011]
Another object of the present invention is to eliminate the difficulty in mounting the reinforcing cloth in a portion that is difficult for an operator to see while preventing the overall displacement of the reinforcing cloth when the mold is closed, and to displace the position in that portion. It is an object of the present invention to provide a method for manufacturing a sheet pad, which can prevent the reinforcing cloth from being broken when the mold is opened or removed after foam molding.
[0012]
[Means for Solving the Problems]
The foaming mold for a seat pad of the present invention is a foaming mold for manufacturing a sheet pad having a reinforcing cloth integrated on the back surface, and a mold for mounting the reinforcing cloth in a cavity. It comprises a plurality of mounting pins projecting from the inner surface, the mounting pins comprising a columnar body extending in the axial direction with a substantially constant thickness, a root portion narrower than the columnar body, and a tapered tip portion. A step is provided between the columnar body and the base.
[0013]
In this foam molding die, since there is a step between the root of the mounting pin and the columnar body, the effect of the reinforcing cloth being hooked by the step is obtained. In addition, the provision of the columnar body portion extending in the axial direction with a substantially constant thickness also provides an effect of being caught by friction. Therefore, detachment after the mounting of the reinforcing cloth can be effectively prevented. Moreover, since the mounting pin has a tapered tip, it is easy to mount the reinforcing cloth, and since the mounting pin does not have an extremely large hook, the product can be smoothly removed after foam molding. .
[0014]
The method for manufacturing a sheet pad according to the present invention is to mount a reinforcing cloth on a foaming mold, inject a foaming material into a cavity and foam the foam, thereby manufacturing a sheet pad having the reinforcing cloth integrated on the back surface. In the method, the foaming mold includes a lower mold that opens upward, an upper mold that opens and closes an upper surface opening of the lower mold, and a lower surface and a side surface of the upper mold that faces the cavity, A mounting pin is provided on the lower surface, a permanent magnet is provided on the side surface, and a magnetic member is provided at a position corresponding to the permanent magnet in the reinforcing cloth, and the reinforcing cloth is attached to the upper mold. On the lower surface portion, the mounting pin is locked by penetrating, and on the side surface portion of the upper die, the magnetic member is locked by magnetically attracting the permanent magnet to the permanent magnet, and the upper die is mounted on the upper die. Features.
[0015]
As described above, the reinforcing cloth is locked by the mounting pin on the lower surface of the upper die, and the side portion which is difficult to be seen from the operator side and is easily torn when opening or removing the mold is locked by magnetic attraction. While preventing the overall displacement of the reinforcing cloth when it is closed, it eliminates the difficulty of mounting the reinforcing cloth in parts that are difficult for workers to see, and also prevents positional displacement and disengagement in those parts, and foaming It is possible to prevent the reinforcing cloth from being broken when the mold is opened or removed after molding. In addition, by using the mounting pin and the permanent magnet together in this way, it is possible to reduce the use amount of the magnetic member and suppress the cost increase.
[0016]
In the method for manufacturing a pad for a sheet according to the present invention, the upper die is rotatably attached to the lower die via a hinge portion, and the permanent magnet is provided on a side surface of the upper die on the hinge portion side. Is a preferred embodiment.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
As shown in FIG. 4, the seat pad according to the present embodiment is a seat cushion pad 10 for an automobile seat, and includes a pad body 12 made of an elastic synthetic resin foam such as a flexible polyurethane foam. And a reinforcing cloth 14 integrally formed over substantially the entire back surface (lower surface) of the pad body 12. Examples of the reinforcing cloth 14 include a coarse blanket, a felt, and a nonwoven cloth.
[0019]
As shown in FIGS. 1 and 2, the foaming mold 20 used for manufacturing the seat cushion pad 10 rotates through a lower mold 22 that opens upward and a hinge portion 24 arranged on one side of the lower mold 22. And an upper die 26 that is provided so as to be capable of opening and closing the upper surface opening of the lower die 22. Specifically, the lower mold 22 is a mold for molding the surface (upper surface) side of the pad, and has a concave portion corresponding thereto. The upper mold 26 is a mold for molding the back surface (lower surface) of the pad. By closing the concave portion, the upper mold 26 corresponds to a pad shape between the lower mold 22 and the inside of the contact surface (PL portion). A cavity 28 which is a foaming space is formed.
[0020]
The upper mold 26 includes a lower surface 26A facing the cavity 28 and a side surface 26B. More specifically, the upper mold 26 includes a core 30 that projects slightly into the recess of the lower mold 22, and the lower surface of the core 30 corresponds to the lower surface 26 </ b> A. The vertical wall corresponds to the side surface 26B.
[0021]
A plurality of mounting pins 32 for mounting the reinforcing cloth 14 in the cavity 28 are provided at predetermined positions on the lower surface 26A of the upper die 26. The mounting pin 32 is provided so as to vertically protrude into the cavity 28 from the inner surface of the upper die 26, and pierces a predetermined portion of the reinforcing cloth 14 so as to penetrate the reinforcing cloth 14 so that the reinforcing cloth 14 is positioned above the cavity 28. It is detachably engaged with the surface of the mold 26.
[0022]
As shown in FIG. 3, the mounting pin 32 has a cylindrical columnar body 34 extending in the axial direction with a substantially constant diameter, a columnar base 36 having a smaller diameter than the columnar body 34, and a tapered, that is, A step 40 is formed between the columnar body 34 and the base 36, which is formed of a conical tip 38.
[0023]
The mounting pin 32 has a protruding height H of about 30 to 60 mm, which is larger than that of the above-mentioned conventional one, so that it is easy for an operator to visually confirm the pin. In addition, the length H1 of the cylindrical body portion 34 is set to H / 3 to H / 2, thereby ensuring a sufficient hooking effect by friction. The diameter D1 of the cylindrical body part 34, which is the maximum diameter of the mounting pin 32, is set to about 8 to 15 mm, and the diameter D2 of the root part is set to about 50 to 80% of D1, so that the step 40 can be appropriately caught. Is preferably ensured. Further, the angle θ of the distal end portion 38 is preferably set to 45 ° or less, more preferably about 20 ° to 40 ° in order to improve the ease of mounting.
[0024]
In addition, the arrangement position and the number of the mounting pins 32 are not particularly limited as long as the reinforcing cloth 14 can be entirely supported on the lower surface portion 26A. For example, in this embodiment, the mounting position and the number of the mounting pins 32 are different from those of the front end portion of the seat cushion pad 10. They are provided at two positions on the left and right at the rear end, respectively (see FIGS. 2, 4 and 5).
[0025]
As shown in FIGS. 1 and 2, a permanent magnet 42 is provided on a side surface 26 </ b> B of the upper die 26. The permanent magnet 42 is embedded so as to be exposed on the inner surface of the mold. In this embodiment, the permanent magnet 42 is provided on the side surface 26 </ b> B on the hinge 24 side. This portion is a portion that becomes a hanging portion 11 that hangs down at the rear end portion of the seat cushion pad 10 (see FIGS. 4 and 5), and a part of the reinforcing cloth 14 integrated with the back surface of the hanging portion 11 is used. The upper magnet 26 is locked by the permanent magnet 42.
[0026]
The magnetic member 16 is provided on the reinforcing cloth 14 at a position corresponding to the permanent magnet 42, specifically, at a portion integrated with the back surface of the hanging portion 11. The magnetic member 16 is formed by attaching a seal made of a magnetic material, attaching a small metal piece, and further applying or impregnating a magnetic paint on a part of the reinforcing cloth 14. Is mentioned.
[0027]
When manufacturing the seat cushion pad 10 using the foaming mold 20, the reinforcing cloth 14 described above is attached to the inner surface of the upper mold 26, as shown in FIG. 1. Specifically, on the lower surface 26A of the upper die 26, a predetermined portion of the reinforcing cloth 14 is pressed against the mounting pin 32, and the mounting pin 32 is pierced and penetrated by the reinforcing cloth 14 to be locked. The side surface 26B of the upper die 26 on the hinge portion 24 side is engaged with the permanent magnet 42 by magnetically attracting the magnetic member 16 of the reinforcing cloth 14.
[0028]
As shown in FIG. 1, the side surface portion 26 </ b> B on the hinge portion 24 side is a portion that is difficult to be seen by the wearer W and is difficult to access, and thus the magnetic attraction between the permanent magnet 42 and the magnetic member 16 is performed. By locking with, mounting workability can be improved, and a shift of the locking position can be prevented to prevent floating during mounting.
[0029]
Next, a foaming raw material 44 is injected into a concave portion of the lower mold 22 from an injecting device (not shown), the upper mold 26 is closed, and foaming and curing are performed in the cavity 28 as shown in FIG. Thereafter, the upper mold 26 is opened and the mold is removed, whereby the seat cushion pad 10 is obtained. At this time, since the reinforcing cloth 14 is locked by magnetic attraction between the permanent magnet 42 and the magnetic member 16 on the side surface portion 26B on the hinge portion 24 side as described above, the reinforcement at the time of opening the mold or removing the mold is performed. The breakage of the cloth 14 can be prevented.
[0030]
As shown in FIGS. 4 and 5, the obtained seat cushion pad 10 is formed by integrally forming a reinforcing cloth 14 on the back surface, and the magnetic material member 16 remains in the hanging portion 11. Since it is the back surface of the seat cushion pad 10 and is the rear end portion and not the seating position, it does not affect the sitting comfort. Reference numeral 18 denotes a mark of the mounting pin 32, that is, a hole formed by the mounting pin 32 during foam molding.
[0031]
According to the present embodiment described above, since there is a step 40 between the root portion 36 of the mounting pin 32 and the columnar body 34, as shown in FIG. Thus, the effect of catching the reinforcing cloth 14 by the above is obtained. Even if it comes off the step 40, as shown in FIG. 3 (c), since the columnar body 34 which is long in the axial direction is provided, a hooking effect due to friction at this portion can be obtained. Therefore, it is possible to effectively prevent detachment of the reinforcing cloth 14 after being attached. In addition, since the mounting pin 32 has a sharper tapered tip portion 38 than the conventional shape, the reinforcing cloth 14 can be easily mounted. Further, since the mounting pin 32 does not have an extremely large hook, the product can be smoothly removed after the foam molding.
[0032]
In addition, since the mounting of the reinforcing cloth 14 is performed by using both the locking by the mounting pins 32 and the magnetic attraction between the permanent magnet 42 and the magnetic member 16, the overall displacement of the reinforcing cloth 14 when the mold is closed can be reduced. While preventing the problem, it is possible to eliminate the difficulty in mounting the reinforcing cloth 14 in a portion that is difficult for the worker W to see, and to prevent a position shift and a detachment in the portion. In addition, it is possible to prevent the reinforcing cloth 14 from being torn when the mold is opened or removed after the foam molding. Further, by using the mounting pin 32 and the permanent magnet 42 together, it is possible to reduce the amount of use of the magnetic member 16 and suppress an increase in cost.
[0033]
As described above, a reliable mounting operation can be performed while reducing the mounting operation load of the reinforcing cloth 14, and the defective rate and the repair rate can be reduced to achieve a significant cost reduction.
[0034]
In the above embodiment, the permanent magnet 42 is provided only on the side surface portion 26B on the hinge portion 24 side to lock the reinforcing cloth 14 by magnetic attraction. It is also possible to employ a simple configuration.
[0035]
【The invention's effect】
The foaming mold of the present invention satisfies the requirement that, due to the unique shape of the mounting pin, it is easy to attach the reinforcing cloth and hard to come off when the mold is closed, but it is easy to come off after foaming. The defective rate and the repair rate can be reduced.
[0036]
Further, according to the manufacturing method of the seat pad of the present invention, while preventing the overall displacement of the reinforcing cloth at the time of closing the mold, it is possible to improve the mounting property of the reinforcing cloth in a part that is difficult to see for an operator, It is possible to prevent the reinforcing cloth from being broken at the time of opening and removing the mold after the foam molding, so that it is possible to reduce the working time and the defect rate.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state in which a reinforcing cloth is attached to a foaming mold in one embodiment of the present invention.
FIG. 2 is a cross-sectional view of the foaming mold according to the embodiment.
FIG. 3A is a side view of a mounting pin, and FIGS. 3B and 3C are side views when the mold is closed.
FIG. 4 is a cross-sectional view of the seat cushion pad in the embodiment.
FIG. 5 is a bottom perspective view of the seat cushion pad in the embodiment.
6A and 6B are side views of a mounting pin of a conventional foaming mold, in which FIG. 6A shows a state in which a reinforcing cloth is mounted, and FIG. 6B shows a state in which the mold is closed.
[Explanation of symbols]
10 Seat cushion pad 12 Pad body 14 Reinforcement cloth 16 Magnetic member 20 Foaming mold 22 Lower mold 24 Hinge part 26 Upper mold 26A Lower surface of upper mold Part 26B Upper side surface part 28 Cavity 32 Mounting pin 34 Column body part 36 Root part 38 Tip part 40 Step 42 Permanent magnet

Claims (4)

What is claimed is: 1. A foam molding die for manufacturing a sheet pad having a reinforcing cloth integrated on a back surface, comprising: a plurality of mounting pins projecting from an inner surface of a mold for mounting the reinforcing cloth in a cavity; Has a columnar trunk portion extending in the axial direction with a substantially constant thickness, a root portion narrower than the columnar trunk portion, and a tapered tip portion, and a step between the columnar trunk portion and the root portion. A foam molding die, characterized by having: A method for manufacturing a sheet pad in which the reinforcing cloth is integrated on the back surface by mounting a reinforcing cloth on the foaming mold according to claim 1 and injecting a foaming material into a cavity to cause foaming,
The foaming mold includes a lower mold that opens upward, and an upper mold that opens and closes an upper surface opening of the lower mold. At the lower surface and side surfaces of the upper mold that faces the cavity, the lower surface includes A mounting pin is provided, and a permanent magnet is provided on the side surface,
A magnetic material member is provided at a position corresponding to the permanent magnet in the reinforcing cloth, and the reinforcing cloth is locked by penetrating the mounting pin on the lower surface of the upper die, and on a side surface of the upper die. A method of manufacturing a seat pad, wherein the magnetic member is magnetically attracted to the permanent magnet so as to be locked and mounted on the upper die. A method of manufacturing a sheet pad in which the reinforcing cloth is integrated on the back surface by mounting a reinforcing cloth on a foaming mold and injecting a foaming material into a cavity to cause foaming,
The foaming mold includes a lower mold that opens upward, and an upper mold that opens and closes an upper surface opening of the lower mold. The lower mold and the side of the upper mold that face the cavity are mounted on the lower surface. A pin is provided, and a permanent magnet is provided on the side surface,
A magnetic member is provided at a position corresponding to the permanent magnet in the reinforcing cloth, and the reinforcing cloth is locked by penetrating the mounting pin on the lower surface of the upper mold, and is fixed on a side surface of the upper mold. A method for manufacturing a pad for a sheet, wherein the magnetic member is magnetically attracted to the permanent magnet so as to be locked and mounted on the upper die. 4. The upper die is rotatably attached to the lower die via a hinge portion, and the permanent magnet is provided on a side surface of the upper die on the hinge portion side. A method for manufacturing the sheet pad according to the above.

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