JP4074465B2 - Infant support and method for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support for an infant incorporated in a child seat, a child cart, a rack or the like.
[0002]
[Prior art]
A child seat is known in which an impact absorbing material made of a material having a smaller coefficient of restitution than that of the foamed resin is attached to a foamed resin pad to improve impact resistance (for example, JP-A-10-1000076). No. publication). Conventionally, such a shock absorbing material is fixed using a fixing means such as a double-sided tape or an adhesive after the pad is formed.
[0003]
[Problems to be solved by the invention]
However, when a double-sided tape is used for attaching the shock absorber, the number of assembling steps is increased and the work is troublesome. When strong double-sided tape is used with priority given to adhesive strength, it takes more time to apply the adhesive. On the other hand, if the adhesive strength of double-sided tape is weakened, the shock absorber will easily peel off during use. Become. Further, when the attachment of the shock absorbing material is entrusted to manual work, there is a risk that a sticking failure such as a shift in the position of the shock absorbing material may occur, resulting in a reduction in product yield. There is also a problem that the material cost increases by using the double-sided tape. Even when an adhesive is used, there are the same problems as when double-sided tape is used.
[0004]
Therefore, the present invention joins the pad of the support for infants used in child seats and the like and the shock absorber more easily and firmly than before, thereby improving the durability during use and reducing the work man-hours and material costs. It is an object of the present invention to provide a support for infants that can reduce the cost due to the above, and can improve the yield rate of the product by suppressing variations in the fixed position of the shock absorber, and a method for manufacturing the same. .
[0005]
[Means for Solving the Problems]
Hereinafter, the support for infants and the manufacturing method thereof according to the present invention will be described. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.
[0006]
The infant support of the present invention comprises a foamed resin pad (2) and an impact absorbing material (3) formed of a material having a different coefficient of restitution from the foamed resin constituting the pad. The pad is molded in a state in which the shock absorber is accommodated in a mold (10) for molding the pad, whereby the pad and the shock absorber are joined together, and the recess of the pad is formed. The shock absorbing material is mounted on the inner peripheral surface (7a) of the concave portion and the outer peripheral surface (3a) of the shock absorbing material facing the inner peripheral surface of the concave portion is inclined with respect to the depth direction of the concave portion. The problem mentioned above is solved by being inclined .
[0007]
According to this support for infants, since the pad and the shock absorbing material are joined at the time of forming the pad, it is not necessary to fix the shock absorbing material with a double-sided tape or the like after forming the pad. Thereby, the assembly man-hour is reduced. In addition, since the pad and the impact absorbing material are firmly joined together with the foaming and hardening of the resin foam stock solution injected into the mold, the impact absorbing material is prevented from being peeled off during use. By placing the shock absorbing material at a fixed position in the mold, the frequency of occurrence of defects such as steps due to the displacement of the fixed position of the shock absorbing material can be reduced, thereby improving the product yield rate. Fixing means such as a double-sided tape and adhesive can be eliminated, and material costs can be saved.
[0008]
In the infant support this, the shock absorber is mounted in the recess of the pad, the outer peripheral surface of the inner peripheral surface of the concave portion and the shock absorber facing the it is inclined obliquely to the depth direction of the recess Therefore, even if the resin liquid permeates into the outer periphery of the shock absorber and the hardened portion (17) is formed, the hardened portion is inclined with respect to the depth direction of the concave portion, so that the shock absorber is pushed in. The feeling of resistance is eased.
[0009]
In the method for manufacturing an infant support device of the present invention, the pad (2) of the infant support device is formed of a material having a coefficient of restitution different from the foamed resin of the pad in the mold (10). In the manufacturing method of disposing the shock absorbing material (3), injecting a resin foam stock solution into the mold, then closing the mold, and molding the pad while contacting the resin liquid and the shock absorbing material, A partition wall (11) for partitioning the shock absorber housing portion (12) is provided inside the mold, and the shock absorber is attached to the shock absorber housing portion surrounded by the partition wall, A size in which the surface (3b) of the shock absorber facing the opening direction of the shock absorber housing portion and the resin foam stock solution are in contact with each other and the shock absorber protrudes outside the inner periphery of the partition wall. The shock absorber is compressed by the partition wall. By mounting the shock absorbing material container in the so that, to solve the problems described above.
[0010]
According to this manufacturing method, it is possible to prevent the impact absorbing material from peeling off during use by firmly joining the pad and the impact absorbing material while reducing the number of work steps for the same reason as the support tool of the present invention. In addition, it is possible to reduce the frequency of occurrence of defects such as steps due to the displacement of the fixed position of the shock absorbing material, thereby improving the product yield rate. Fixing means such as a double-sided tape and adhesive can be eliminated, and material costs can be saved. The partition wall can prevent contact between the outer periphery of the shock absorbing material and the resin foam stock solution, thereby preventing the phenomenon that the foamed resin liquid permeates into the outer periphery of the shock absorbing material and a cured portion is formed. The partition wall forms a non-joined portion between the outer peripheral surface of the shock absorbing material and the pad, thereby improving the breathability of the infant support tool as compared with the case where the pad is joined to the entire circumference.
[0011]
Furthermore, in this manufacturing method, when the pad is removed from the mold and the partition wall after the foamed resin is cured, the shock absorbing material is expanded so as to fill a gap corresponding to the partition wall. For this reason, the external appearance of a support tool can be improved by making an impact-absorbing material and a pad continue without a gap. Further, at the time of molding the pad, the outer periphery of the shock absorbing material is compressed and the infiltration of the resin foam stock solution is suppressed.
[0012]
In the method for manufacturing an infant support device of the present invention, the pad (2) of the infant support device is formed of a material having a coefficient of restitution different from the foamed resin of the pad in the mold (10). In the manufacturing method of disposing the shock absorbing material (3), injecting a resin foam stock solution into the mold, then closing the mold, and molding the pad while contacting the resin liquid and the shock absorbing material, A partition wall (11) for partitioning the shock absorber housing portion (12) is provided inside the mold, and the shock absorber is attached to the shock absorber housing portion surrounded by the partition wall, The surface (3b) of the shock absorber facing the opening direction of the shock absorber housing portion is brought into contact with the resin foam stock solution so that the shock absorber protrudes outside the inner periphery of the partition wall. Forming and compressing the shock absorber by the partition wall In this way, the shock absorber is mounted in the shock absorber housing portion, and the shock absorber housing portion has a size that protrudes outside the partition wall, and a hole is provided in a region covering the shock absorber. After mounting the shock absorbing material to which the cover (16) is bonded, the resin foaming stock solution is injected, the mold is then closed, and the pad and the shock absorbing material are joined together as described above. Solve the problem.
[0013]
According to this manufacturing method, it is possible to prevent the impact absorbing material from peeling off during use by firmly joining the pad and the impact absorbing material while reducing the number of work steps for the same reason as the support tool of the present invention. In addition, it is possible to reduce the frequency of occurrence of defects such as steps due to the displacement of the fixed position of the shock absorbing material, thereby improving the product yield rate. Fixing means such as a double-sided tape and adhesive can be eliminated, and material costs can be saved. The partition wall can prevent contact between the outer periphery of the shock absorbing material and the resin foam stock solution, thereby preventing the phenomenon that the foamed resin liquid permeates into the outer periphery of the shock absorbing material and a cured portion is formed. The partition wall forms a non-joined portion between the outer peripheral surface of the shock absorber and the pad, thereby improving the breathability of the infant support.
[0014]
Further, in this manufacturing method, since the boundary portion between the inner peripheral surface of the partition wall and the outer peripheral surface of the shock absorber is covered by the cover, the resin foam concentrate enters from the gap between the partition wall and the shock absorber. Thus, a phenomenon that a hardened portion is formed on the outer periphery of the shock absorbing material is prevented. Thereby, formation of the hardening part in the outer periphery of an impact-absorbing material can be prevented more reliably. On the other hand, the bottom surface side of the shock absorbing material is joined to the pad by the surface of the shock absorbing material coming into contact with the resin foam stock solution through the hole formed in the cover. In addition, what is necessary is just to perform adhesion | attachment with an impact-absorbing material and a cover by conventionally well-known means, such as an adhesive tape, an adhesive agent, and flame fusion (frame lamination).
[0015]
In the manufacturing method of the present invention, the cover may be formed so as to draw a closed shape while extending along the partition wall. In this case, while covering the gap between the outer peripheral surface of the shock absorber and the inner peripheral surface of the partition wall with the cover, most of the surface of the shock absorber can be exposed in the mold and brought into contact with the resin foam stock solution. .
[0016]
In the present invention, various materials may be used for the shock absorber and the pad. Preferably, the shock absorber is made of a flexible polyurethane foam, and the pad is made of polyurethane mold as the foamed resin material. It can be molded by injecting the raw material into the mold and foaming.
[0017]
In the present invention, the pad means a structure provided with a shape and strength suitable for supporting at least a part of the infant's body, and various shapes such as a plate shape, a box shape, and a frame shape are included in the concept of the pad. . The shock absorbing material only needs to be made of a material having a coefficient of restitution different from that of the resin constituting the pad and integrated with the pad, and the shape is not limited to a sheet shape, and may be formed in various shapes. Good. The support of the present invention is used by being incorporated into various types of infant products such as a child seat, a stroller, a rack, a carry and the like.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an example of an infant support formed according to the present invention. An infant support tool (sometimes abbreviated as a support tool) 1 includes a pad 2 and a shock absorber 3 provided to be embedded in the pad 2. The support 1 is incorporated into various infant products such as a child seat 4 and strollers 5 and 6 in order to support an infant or an infant. For example, in the case of the child seat 4, as shown in FIG. 2, the support 1 is attached to a shell S formed of a hard resin such as polypropylene, and then the shell S is covered with a skin material (not shown). A body is formed. The pad 2 is a foam molded product made of foamed resin. The pad 2 is given a shape suitable for supporting an infant. The shock absorbing material 3 is formed in a sheet shape using a foamed resin material having a smaller coefficient of restitution than the resin constituting the pad 2. The mounting position of the shock absorber 3 is, for example, a position where an infant's head contacts.
[0019]
FIG. 3 shows a cross section of the support 1. A recess 7 is formed in the pad 2, and the shock absorbing material 3 is mounted inside the recess 7. The shock absorber 3 is joined to the pad 2 when the pad 2 is molded. The pad 2 and the shock absorbing material 3 are joined to each other via a joint 8 on the bottom side of the recess 7. The joint 8 is formed by the resin foam stock solution of the raw material of the pad 2 permeating into the shock absorbing material 3 and foaming and curing. Such a joint 8 is not formed between the inner peripheral surface 7a of the recess 7 and the outer peripheral surface 3a of the shock absorber 3, and both are simply in contact with each other. That is, the non-joining part 9 is formed between the outer peripheral surface 3a of the shock absorber 3 and the inner peripheral surface 7a of the recess 7 over the entire circumference.
[0020]
4A and 4B show the main part of the lower mold for forming the pad 2, in which FIG. 4A is a cross-sectional view, and FIG. 4B is a perspective view of an impact absorbing material accommodating part provided in the mold. As shown in these drawings, a partition wall 11 is provided on the bottom surface 10a of the lower mold 10 to partition the shock absorber accommodating portion 12 for mounting the shock absorber 3. The partition wall 11 is provided so as to draw a similar rectangular shape slightly smaller than the outer periphery of the shock absorber 3. In other words, the shock absorber 3 has a size that uniformly protrudes outside the inner peripheral surface 11 a of the partition wall 11. The height of the partition wall 11 is substantially the same as the thickness of the shock absorber 3. However, the height may be smaller or larger than the thickness of the shock absorber 3.
[0021]
FIG. 5 shows a procedure for forming the pad 2 using the lower mold 10. When the pad 2 is molded, first, the shock absorber 3 formed in a predetermined shape is attached to the shock absorber housing portion 12 of the lower mold 10 as shown in FIG. At this time, since the shock absorber 3 is larger than the shock absorber accommodating portion 12, the shock absorber 3 is attached to the shock absorber accommodating portion 12 in a compressed state from the outer peripheral side. Thereafter, the stock solution 14 of the soft foam resin is poured into the mold. Then, as shown in FIG.5 (b), the upper mold | type 13 is covered and a type | mold is closed, The foaming stock solution 14 is foamed and hardened on predetermined conditions. At this time, when the surface 3b of the shock absorber 3 facing the opening direction of the shock absorber housing portion 12 (upward in FIG. 5) and the foaming stock solution 14 are in contact with each other, the joint portion 8 of FIG. 3 is formed. Since the shock absorbing material 3 is compressed and accommodated inside the partition wall 11, particularly bubbles on the outer periphery of the shock absorbing material 3 are crushed, so that the infiltration of the stock solution 14 into the outer peripheral side of the shock absorbing material 3 is suppressed. The
[0022]
After foaming and curing of the stock solution 14 are completed, the mold is opened, and the pad 2 is released from the lower mold 10 as shown in FIG. At this time, a gap 15 corresponding to the partition wall 11 is formed between the pad 2 and the shock absorber 3, but the shock is absorbed so as to fill the gap 15 by releasing the shock absorber 3 from the compressed state by release. As the absorbent 3 expands, the outer peripheral surface 3a of the shock absorber 3 and the inner peripheral surface 7a of the recess 7 of the pad 2 are in close contact as shown in FIG.
[0023]
As described above, according to the manufacturing method of the present embodiment, when the pad 2 is formed, the shock absorber 3 is disposed in the mold, and the molding of the pad 2 and the joining of the shock absorber 3 can be completed simultaneously. The operation | work which affixes the impact-absorbing material 3 after shaping | molding of the pad 2 becomes unnecessary. Further, since the shock absorbing material 3 is mounted in the partition wall 11 provided in the lower mold 10, the position of the shock absorbing material 3 with respect to the pad 2 is constant, and a product defect or the like due to the displacement of the shock absorbing material 3 does not occur.
[0024]
Note that the lower mold 10, the partition wall 11 and the upper mold 13 are all preferably made of a material having excellent thermal conductivity in order to keep the temperature conditions during foaming uniform. It is desirable to configure the mold 10 and the partition wall 11. The partition wall 11 may be provided integrally with the lower mold 10, or may be manufactured in a separate process from the lower mold 10 and fixed to the lower mold 10. For example, welding can be used to fix the partition wall 11. The partition wall 11 may be fixed to the lower mold 10 using bolts or rivets.
[0025]
For example, polyurethane foam resin can be used as the material of the pad 2. For the shock absorber 3, various resin materials having a smaller coefficient of restitution than the material of the pad 2 can be used. For example, polyurethane foam is suitably used as the material for the shock absorber 3. Among them, a polyurethane foam that satisfies the conditions of a density of 37 to 53 kg / cm ³ , a hardness of 1.0 to 4.5 kg / 100 cm ² , and a coefficient of restitution (rebound resilience) of 12% or less is used for the shock absorber 3. It is desirable. In addition, the breathability of the polyurethane foam used for the shock absorber 3 is set to 15 to 50 cc / min · s, preferably 20 to 35 cc / min · s. If the air permeability exceeds 50 cc / min · s, the amount of the foaming stock solution 14 infiltrated into the impact absorbing material 3 increases, and the joint 8 formed as the stock solution 14 infiltrated into the impact absorbing material 3 is foamed and cured. May become excessive and the impact absorbing performance of the impact absorbing material 3 may be impaired. On the other hand, if the air permeability is less than 15 cc / min · s, the stuffiness at the time of use cannot be ignored, which may not be suitable for long-time use.
[0026]
However, the present invention is not limited to the example in which the pad 2 and the shock absorbing material 3 are formed of a polyurethane material, and these materials can be variously modified as long as they are suitable for the manufacturing method of the present invention. For example, a semi-rigid foam resin can be used for the pad 2, and a soft urethane foam can be used for the shock absorber 3.
[0027]
FIG. 6 shows another manufacturing method of the infant support 1. In this manufacturing method, the shock absorbing material 3 in which the urethane film 16 as a cover is bonded to the shock absorbing material accommodating portion 12 of the lower mold 10 is attached, the foaming stock solution 14 is injected, and then the mold is closed. It is done. The process after the injection of the foaming stock solution 14 may be the same as in FIG. The film 16 has a rectangular shape that protrudes outward from the partition wall 11, and a rectangular hole 16 a that is similar to the outer peripheral shape is formed inside. Thereby, the film 16 is given a closed shape extending along the partition wall 11 with a certain width. The protruding amount A of the film 16 from the outer peripheral surface 11b of the partition wall 11 is set to 10 to 20 mm, and the protruding amount B of the film 16 from the inner peripheral surface 11a of the partition wall 11 is set to 10 to 50 mm.
[0028]
By covering the part of the partition wall 11 with such a film 16, the infiltration of the foaming stock solution 14 from the gap between the partition wall 11 and the shock absorber 3 is prevented, and the hardening portion 17 on the outer periphery of the shock absorber 3 is prevented. Formation (foaming and hardening of the stock solution 14) can be prevented. The film 16 is embedded in the support 1. The film 16 is preferably made of the same material as the pad 2 and the shock absorber 3. For example, when the pad 2 and the impact absorbing material 3 are formed of urethane foam resin, the film 16 may be formed of urethane foam resin. In the present invention, the cover is not limited to a film shape, and can be appropriately changed as long as the boundary portion between the partition wall 11 and the shock absorber 3 can be covered.
[0029]
In FIG. 6, the hole 16a of the film 16 is rectangular, but the present invention is not limited to such an example. For example, as shown in FIG. 7A, the hole 16 a can be appropriately provided in a region of the film 16 that covers the shock absorber 3. What is necessary is just to adjust the area (total area in the case of a plurality) of the hole 16a according to the bonding strength required between the shock absorber 3 and the pad 2.
[0030]
In the above embodiment, the partition wall 11 is provided so that the entire circumference of the shock absorber 3 is not joined to the pad 2. However, these may be partially joined. For example, as shown in FIG. 7 (b), the film 16 is appropriately provided with the perforations 16 b... 16 b along the partition wall 11 to partially penetrate the stock solution 14 into the gap between the shock absorber 3 and the partition wall 11. By allowing it, the outer periphery of the shock absorbing material 3 can be partially joined to the pad 2. Moreover, as shown in FIG.7 (c), the outer periphery of the shock absorber 3 may be partially joined with the pad 2 by providing the partition wall 11 with the slit 11c ... 11c partially.
[0031]
In addition, when a hardened part may arise in the outer periphery of the shock absorber 3, the partition wall 11 may be omitted and only a means for holding the shock absorber 3 in a fixed position in the lower mold 10 may be provided. You may arrange | position the impact-absorbing material 3 in which the process which prevents permeation of the undiluted | stock solution 14 was given to outer periphery in a type | mold.
[0032]
In the present invention, the outer peripheral surface 3a of the shock absorber 3 is not limited to a surface parallel to the depth direction of the recess 7 (vertical direction in FIG. 3). For example, as shown in FIG. 8A, the outer peripheral surface 3 a of the shock absorber 3 may be inclined obliquely with respect to the depth direction of the recess 7. In this case, as shown in FIG. 8B, even if the stock solution is infiltrated between the outer peripheral surface 3a and the concave portion 7 to form the hardened portion 17, the force F for pushing the shock absorbing material 3 is applied. Since the hardened portion 17 is inclined obliquely, it is difficult to feel the resistance as compared with the case where the hardened portion 17 extends straight in the direction of the force F, and the tactile sensation of the shock absorber 3 is not impaired.
[0033]
【The invention's effect】
As described above, according to the support of the present invention and the manufacturing method thereof, since the pad and the impact absorbing material are joined at the time of forming the pad, the impact absorbing material such as a double-sided tape is used after the pad is formed. It is no longer necessary to fix with the fixing means, and as a result, the pad and the shock absorber can be firmly joined while reducing the number of assembly steps and material costs, and the shock absorber can be prevented from peeling off during use. It is possible to improve the yield rate of products by reducing the frequency of occurrence of defects such as steps due to position shift.
[Brief description of the drawings]
FIG. 1 is a view showing a support tool of the present invention and its application.
FIG. 2 is a diagram showing an example of a usage mode of a support for a child seat shell.
FIG. 3 is a cross-sectional view of a support.
FIG. 4 is a view showing an internal configuration of a lower mold for manufacturing a support.
FIG. 5 is a process diagram showing a procedure for forming a support.
FIG. 6 is a diagram showing an internal configuration of a lower mold in another manufacturing method.
FIG. 7 is a view showing a modified example of a film and a partition wall.
FIG. 8 is a cross-sectional view showing a modified example of the shock absorber.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Infant support 2 Pad 3 Shock absorption material 3a Outer surface 3b of shock absorption material Surface 4 of shock absorption material Child seats 5, 6 Stroller 7 Pad recess 7a Inner surface 8 of the recess 8 Joint 9 Non-joint 10 Lower mold 10a Lower mold bottom surface 11 Partition wall 11a Partition wall inner peripheral surface 11b Partition wall outer peripheral surface 12 Shock absorber accommodating portion 13 Upper mold 14 Foaming stock solution 15 Clearance 16 Film (cover)
16a, 16b Hole 17 Hardened part

Claims (5)

In an infant support comprising a foamed resin pad and a shock absorber formed of a material having a different coefficient of restitution from the foamed resin constituting the pad,
By molding the pad in a state where the shock absorber is accommodated in a mold for molding the pad, the pad and the shock absorber are joined together,
The shock absorbing material is mounted in the concave portion of the pad, and the inner peripheral surface of the concave portion and the outer peripheral surface of the shock absorbing material facing the inner peripheral surface of the concave portion are inclined with respect to the depth direction of the concave portion. milk infant support you, characterized in that there. Place a shock absorber made of a material having a coefficient of restitution different from the foam resin of the pad in a mold for molding a pad for a baby support tool, and inject a resin foam stock solution into the mold. Thereafter, the mold is closed, and the pad support is molded while the resin foam stock solution and the shock absorber are in contact with each other .
A partition wall for partitioning the shock absorber housing portion is provided inside the mold, and the shock absorber is mounted on the shock absorber housing portion surrounded by the partition wall, and the shock absorber housing portion The surface of the shock absorbing material directed in the opening direction of the resin and the resin foam stock solution are brought into contact with each other , and the shock absorbing material is formed so as to protrude outward from the inner periphery of the partition wall. method for producing a milk infant support you, characterized in that in the timber to be compressed by the partition wall is attached to the shock absorbing material container. Place a shock absorber made of a material having a coefficient of restitution different from the foam resin of the pad in a mold for molding a pad for a baby support tool, and inject a resin foam stock solution into the mold. Thereafter, the mold is closed, and the pad support is molded while the resin foam stock solution and the shock absorber are in contact with each other .
A partition wall for partitioning the shock absorber housing portion is provided inside the mold, and the shock absorber is mounted on the shock absorber housing portion surrounded by the partition wall, and the shock absorber housing portion contacting the surface of the shock absorber oriented in the opening direction and said resin foam stock solution,
The shock absorber is formed in a size that protrudes outward from the inner periphery of the partition wall, the shock absorber is attached to the shock absorber housing portion so as to be compressed by the partition wall , and the impact After mounting the shock absorber having a size that protrudes outside the partition wall and having a cover provided with a punch hole in the region covering the shock absorber, the resin container is mounted the foam stock solution was injected, the manufacturing method subsequent to the mold closed by the pad and the shock absorber and the infant for support you characterized by joining together. The said cover is formed so that a closed shape may be drawn, extending along the said partition wall, The manufacturing method of the infant support tool of Claim 3 characterized by the above-mentioned. Said shock absorber is composed of a flexible polyurethane foam, the pad is claim 3, characterized in that it is formed by foaming by injecting a polyurethane molded foam material as the foamed resin material into the mold or The manufacturing method of the support for infants of Claim 4 .

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