JP2004155476A - Hinge part structure of styrene foam molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hinge part structure of a styrene foam molding which is sufficiently withstandable even at a folded portion requiring the bending angle of about 90° such as a folded portion to form a box shape. <P>SOLUTION: In the styrene foam molding, plate-like members 2 and 2 are connected to each other via a hinge part 1. The hinge part 1 has a recessed streak groove 3 formed between the plate-like members 2 and 2, and a projecting bar projection 4 is formed on a bottom portion 3a of the recessed streak groove 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a hinge structure of a styrofoam molded product, and more particularly to a hinge structure of a styrofoam molded product suitable for a bent portion for bending a flat styrofoam molded product into a box shape.
[0002]
[Prior art]
Conventionally, Styrofoam is lightweight, has excellent heat insulation and cushioning properties, and is inexpensive compared to other foamed synthetic resins such as foamed polyurethane and foamed polyolefin. Used as etc.
[0003]
Here, the styrene foam is generally molded into various shapes by a bead foam molding machine, and is used as a packing material or a heat insulating material.If the shape is, for example, a box shape, the The bottom surface and the left, right, front and rear side surfaces are usually integrally formed.
[0004]
[Problems to be solved by the invention]
However, if the rigidity of the box body is to be ensured by the Styrofoam molded article itself, it is naturally preferable to form a box-shaped integrally molded article as described above. In the case where only the heat insulating property, cushioning property and the like of the styrene foam are used, it is not necessary to integrally mold the foam into a box shape.
[0005]
In consideration of the transportation and storage costs before use, a plate-shaped assembly naturally has less bulkiness than a box-shaped integrally molded product, so that the transportation and storage costs can be reduced.
[0006]
Furthermore, when a deep-bottom box is integrally molded by a bead foam molding machine, there are difficulties in the filling property of the foam beads as a raw material and the releasability from a mold, and the defective product rate is inevitably increased, Yield deteriorates.
[0007]
From the above, the emergence of a polystyrene foam molded article that can be assembled into a box shape by bending, such as a corrugated cardboard box, has been strongly desired. However, polystyrene foam has poor flexibility and flexibility among foam synthetic resins. Because it is a brittle material, it is easily broken when bent, and the structure of the hinge portion simply formed into a thin wall cannot withstand bending (about 90 degrees bending) in assembling into a box shape and breaks. Was happening.
[0008]
Accordingly, an object of the present invention is to provide a hinge part structure of a styrofoam molded product that can sufficiently withstand a bent part requiring a bending angle of about 90 degrees, such as a bent part for forming a box shape. It is in.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a hinge part structure of a styrofoam molded product having a structure in which plate members are connected via a hinge part, wherein the hinge part is formed between the plate members by a concave groove. In addition, a hinge part structure of a Styrofoam molded product having one or more convex ridges formed at the bottom of the concave groove is provided.
[0010]
According to the above-described hinge structure of the Styrofoam molded product according to the present invention, since one or more convex ridges are formed at the bottom of the concave groove serving as the bent portion, the curvature of the concave groove bottom is dispersed by the convex ridge. In addition, since one place is prevented from being largely bent, it is possible to provide a hinge portion that can sufficiently withstand a bent portion requiring a bending angle of about 90 degrees, for example.
[0011]
Here, in the hinge portion structure of the Styrofoam molded product according to the present invention, when the convex ridge formed at the bottom of the concave groove is bent, abuts against the side surface of the concave groove, or another convex ridge, It is preferable that each of the concave groove bottoms divided by the convex ridges is configured to regulate a bending angle.
This is preferable because a structure that can surely prevent only one portion of the concave groove bottom from being greatly bent can be obtained.
[0012]
Further, in the hinge portion structure of the styrofoam molded product according to the present invention, a groove is formed on a surface opposite to a surface on which the concave groove is formed and on a portion where the convex protrusion is formed. Is preferred.
This is preferable because the groove is deformed in a direction in which the groove easily spreads due to a tensile force at the time of bending, so that the hinge is more easily bent and a stress concentration is less likely to occur.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the above-mentioned hinge portion structure of the styrofoam molded product according to the present invention will be described in detail with reference to the accompanying drawings.
[0014]
FIGS. 1 and 2 are views showing a first embodiment of the hinge portion structure of the present invention. In the hinge portion 1, a concave groove 3 is formed over the entire width between the plate-like members 2, 2. FIG. Thus, a single protrusion 4 is formed on the bottom 3 a of the groove 3.
[0015]
The concave groove 3 opens upward in a V-shape, and as shown in FIG. 2, the upper sides of both side surfaces 3b, 3b of the concave groove 3 are formed on inclined surfaces each opened at 45 degrees to the vertical direction. Have been. The side surface 3 b of the groove 3 is also the side surface of the plate-like member 2.
[0016]
The convex ridge 4 is formed at the center of the bottom 3 a of the concave groove 3 in parallel and continuously along the longitudinal direction of the concave groove 3. Are divided into parallel narrow concave grooves 5. Further, the upper end 4a of the ridge projection 4 is formed in a mountain shape having a vertical angle of 90 degrees as shown in FIG.
[0017]
In the above-described first embodiment, the width W of the concave groove 3 constituting the hinge portion 1 is 11 mm, the depth H is 13 mm, and the above angle from the height of 5 mm from the bottom 3 a is the above angle. It is opened in a V-shape. The plate thickness T of the plate members 2 connected via the hinge 1 is 16 mm. Therefore, the thickness t of the hinge part 1 is 3 mm.
Further, the width w of the convex ridge 4 formed on the bottom 3a of the concave groove 3 is 3 mm, and the height h is 5 mm. Accordingly, the widths w1 and w2 of the two parallel narrow concave grooves 5 and 5 divided by the convex ridges 4 are each 4 mm.
[0018]
When the hinge portion 1 having the above-mentioned shape and dimensions is bent, the side surfaces 3b, 3b of the concave groove 3 come into contact with each other as shown in FIG. In this case, the upper end 4a of the ridge 4 also contacts the side surfaces 3b, 3b of the groove 3 as shown in the figure, and the two parallel narrow grooves 5, 5 separated by the ridge 4. Are regulated so as to share a bending angle of about 45 degrees, respectively, and a bending part A of 90 degrees is formed by combining both bending angles.
[0019]
When the notch 6 exists between the plate-like members 2 and 2 as shown in FIG. 4, the concave groove 3 is formed to have the entire width excluding the notch 6. In addition, the projections 4 need not be formed continuously on the bottom 3a of the groove 3 but may be formed intermittently on the bottom 3a of the groove 3 as shown in FIG. It may be.
[0020]
Next, FIG. 5 is a view showing a second embodiment of the hinge portion structure of the present invention. In the hinge portion 11 of the second embodiment, the surface opposite to the surface on which the concave groove 3 is formed is opposite. The groove 12 was formed on the side surface and the portion where the ridge projections 4 were formed, that is, the surface opposite to the bending direction in the hinge portion 11 and the thick portion where the plate thickness was difficult to bend. Other than this, it is the same as the product of the first embodiment.
[0021]
In the case of the product of the second embodiment, since the groove 12 is formed on the surface opposite to the bending direction where the tensile force acts most when it is bent, and at the thick portion where the plate is difficult to bend, the hinge 12 is formed. When the portion 11 is bent, as shown in FIG. 6, the groove 12 is deformed in a direction in which the groove 12 is easily expanded by the tensile force, and becomes a hinge portion which is more easily bent and hardly causes stress concentration.
The groove 12 does not need to be formed over the entire width of the connecting portion between the plate-shaped members 2 and 2 (excluding the notch 6) as in the case of the above-mentioned concave groove 3; Preferably, it is formed across.
[0022]
FIG. 7 is a view showing a third embodiment of the hinge structure of the present invention. The hinge portion 21 of the third embodiment is formed with two convex ridges 22, 22 extending parallel to the bottom 3a of the concave groove 3.
When the two convex ridges 22 are formed in the concave groove 3 in this manner, the concave groove 3 becomes three parallel narrow concave grooves 23, 23, and when bent at the hinge portion 21 as shown in FIG. 8, the bending angle shared by the bottoms of the concave grooves 23 is about 30 degrees, and the load is more distributed to bending. The hinge part becomes the hinge part.
[0023]
The above-mentioned hinges 1, 11, 21 and the like are all integrally formed together with the plate-like members 2, 2 connected by the hinges using a polystyrene foam as a material by a bead foam molding machine or the like.
[0024]
FIG. 9 shows a styrofoam molded product 51 having a structure in which four rectangular plate members 2, 2, 2, 2 are connected using the hinge portion 1 of the first embodiment.
The styrofoam molded product 51 is bent at 90 degrees at the hinge portion 1 to form the side wall of the box as shown in FIG. 10, and a bottom plate 52 formed of styrofoam separately and, if necessary, Together with the plate 53, it is housed in a cardboard box 54 and is used as a pass-through box having heat insulation.
In this case, naturally, it is possible to form a styrofoam molded product in which the six plate-like members constituting the box are connected in the expanded state by the hinge portion structure according to the present invention.
[0025]
As described above, the embodiment of the hinge portion structure of the Styrofoam molded product according to the present invention has been described. However, the present invention is not limited to the above-described embodiment, and is a technical idea of the present invention, that is, a bent portion. One or more convex ridges are formed at the bottom of the concave groove, and the convex ridge disperses the bending of the bottom of the concave groove, so that cracks are unlikely to occur even in a Styrofoam molded product having poor flexibility and flexibility. It goes without saying that various modifications and changes are possible within the scope of the technical idea of the hinge portion.
[0026]
【The invention's effect】
As described above, if the hinge part structure of the styrofoam molded product according to the present invention described in detail is used, for example, even in a bent part requiring a bending angle of about 90 degrees, such as a bent part for forming a box shape, it is sufficient. Can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment of a hinge part structure of a polystyrene foam molded article according to the present invention.
FIG. 2 is an enlarged sectional view of a portion along the line aa in FIG.
FIG. 3 is a cross-sectional view showing a bent state of a hinge portion of the first embodiment product.
FIG. 4 is a plan view showing a modification of the hinge portion of the first embodiment.
FIG. 5 is a sectional view showing a second embodiment of the hinge structure of the styrofoam molded product according to the present invention.
FIG. 6 is a cross-sectional view showing a bent state of a hinge portion of the product of the second embodiment.
FIG. 7 is a sectional view showing a third embodiment of a hinge portion structure of a styrofoam molded product according to the present invention.
FIG. 8 is a cross-sectional view showing a bent state of a hinge portion of the product of the third embodiment.
FIG. 9 is a perspective view showing an example of a Styrofoam molded product utilizing the hinge structure of the Styrofoam molded product according to the present invention.
FIG. 10 is a perspective view showing a state in which the styrofoam molded article shown in FIG. 9 is bent at its hinge portion to form a pass-through box having heat insulation properties.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hinge part 2 of 1st Example 2 Plate-shaped member 3 Concave groove 3a Concave groove bottom 3b Concave groove side wall 4 Convex protrusion 4a Convex protrusion upper part 5 Thin concave groove 6 cut off by a convex protrusion 6 Notch Part 11 Hinge part 12 of the second embodiment Groove 21 Hinge part 22 of the second embodiment Convex ridge 23 Narrow concave groove 51 divided by a convex projection Styrofoam molded product 52 having hinge part Bottom plate 53 Top plate 54 Corrugated cardboard box

Claims (3)

In the hinge structure of a styrofoam molded product having a structure in which the plate-like members are connected via a hinge, the hinge is a concave groove formed between the plate-like members and a bottom is formed in the bottom of the concave groove. A hinge portion structure of a styrofoam molded product, wherein at least one ridge projection is formed. When the convex ridge formed on the bottom of the concave groove is bent, the convex ridge contacts the side surface of the concave groove or another convex ridge, and regulates the bending angle of the concave groove bottom divided by the convex ridge. The hinge part structure of a styrofoam molded product according to claim 1, characterized in that: The styrofoam molded article according to claim 1 or 2, wherein a groove is formed on a surface opposite to the surface on which the concave groove is formed and on a portion where the convex protrusion is formed. Hinge structure.

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