JPH09202327A - Hollow structural body with ribs - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hollow structural body having an innovative structure which is widely used as a product, is easily joined to other members and parts, and can be easily used in the production of a pallet or the like. SOLUTION: This hollow structural body has peripheral platelike ribs 5 connecting the four sides of a top plate 1 and those of a bottom plate 2, which are so arranged that their faces are opposite each other, and a plurality of hollow spaces 3 made by partitioning a space between the faces of the opposite top and bottom plates by means of a plurality of inner platelike ribs 4 connecting the both at an arbitrary intervals. Some or all of the peripheral platelike ribs 5 and/or inner platelike ribs 4 are passed through one or both peripheral ends or plate faces of the top plate and/or bottom plate and are extended to the outside of the hollow in the direction of the faces, and those ribs and extended ribs are integrated with the top plate 1 and bottom plate 2 with the same base material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ribbed hollow structure having a plurality of hollow spaces.

[0002]

2. Description of the Related Art Hollow structures having a thermoplastic resin as a base material are conventionally well known, and in the case of a relatively large hollow structure, in order to improve its strength, A hollow structure having a plurality of hollow spaces formed by partitioning the hollow portion by providing a plate-shaped rib that connects the top plate portion and the bottom plate surface is also well known. As a manufacturing method thereof, gas injection molding or Methods such as blow molding are known. (Japanese Patent Publication No. 7-12621, Japanese Patent Publication No. 7-22958)

However, since both outer surfaces (top plate portion and bottom plate portion) of such a hollow structure are flat and are panel products having ribs only in the hollow portion inside the structure, they are not suitable for final products. The application was limited. For example, in the case of aiming at a final product having a complicated structure or connecting with other members or parts, there is a problem that the panel product alone cannot handle it, and the connection is limited to each other. It was Also,
When stronger strength is required as a structure, it is necessary to increase the thickness of the structure itself, but in the panel product as described above, the thickness is naturally limited, and a thick hollow structure I couldn't. Further, even if such panel products are overlaid and joined together, there is a problem that the joining becomes joining between wide surfaces and fusion is extremely difficult.

For example, a pallet basically has a three-layer structure of an intermediate layer in which one or two fork insertion openings are provided between upper and lower layers of a top plate and a bottom plate.
Resin pallets are designed to reduce weight and maintain strength.
The upper and lower layers are hollow structures having a plurality of hollow spaces with the hollow part partitioned by a plurality of ribs, and the middle layer divided into 3 or 5 parts by the fork insertion port is the upper and lower parts except the fork insertion port. It is known that it is preferable to form the hollow structure in which the layers are connected by ribs. However, when manufacturing such a pallet from panel products, a small panel corresponding to the divided space is joined between the large panels corresponding to the upper and lower layers by the surfaces excluding the fork insertion port. However, not only is it extremely difficult to join a wide area between the surfaces uniformly and reliably, but it is not practically feasible to join at least four places. The most preferable joining method by fusion is that
It was extremely difficult. Moreover, even if joining is possible, the top plate portions of both panels overlap each other at the joined portion, increasing the weight of the pallet,
A new problem arises in that the purpose of weight reduction cannot be achieved. As described above, the conventional hollow structure such as a panel product is limited in application to the final product, and practically impossible to be applied to a product such as a pallet.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The present inventors have a wide range of application of the product, can be easily joined to other members and parts, and can be easily applied to the production of pallets and the like, which is a hollow structure having a completely new structure that has not been known so far. As a result of examination to develop the above, the present invention has been achieved.

[0006]

That is, according to the present invention, there are provided outer peripheral plate-like ribs which connect the four peripheries of the top plate and the bottom plate arranged so that their surfaces face each other, and the opposing top plate surface and bottom plate surface. Is a hollow structure having a plurality of hollow spaces partitioned by a plurality of internal plate-like ribs that connect at a given interval, and a part or all of the outer peripheral plate-like ribs and / or the internal plate-like ribs is a top plate. And / or the bottom plate surface, and either one or both of the peripheral edges or the plate surface, and extends in the plane direction to the hollow outside by an arbitrary length, and each of these ribs and extension ribs is a top plate and a bottom plate. And a ribbed hollow structure characterized by being integrated with the same base material as described above.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. In the present invention, outer plate ribs that connect the four peripheries of the top plate and the bottom plate arranged so that their surfaces face each other, and a plurality of inner plate shapes that connect the opposing top plate surface and bottom plate surface at an arbitrary interval The hollow structure itself having a plurality of hollow spaces partitioned by ribs is a structure corresponding to a conventional panel product, and the top plate and the bottom plate are generally arranged so that their surfaces are parallel to each other. Also, a plurality of ribs are provided on the same base material as the top plate and the bottom plate so as to be perpendicular to these surfaces. The internal plate-shaped ribs may be linear, corrugated, polygonal, or arranged in any shape such as square, rhombus, circle, and honeycomb, but the most general-purpose top plate and bottom plate are hollow. In the structure, it is preferable to continuously provide parallel to the vertical and horizontal sides of the top plate and the bottom plate in two directions so that they are orthogonal to each other. Providing a plurality of such internal plate-shaped ribs As a result, the hollow portion is further partitioned by these ribs to form a hollow structure having a plurality of hollow spaces.

In order to maintain the strength of the hollow structure, the inner plate ribs as described above surely join the upper and lower ends of each rib to the inner surfaces of the top plate and the bottom plate, respectively.
The inner and outer surfaces of the ribs connecting the four edges of the top plate and bottom plate are securely joined and integrated, and each hollow space partitioned by the inner plate ribs is provided so as to form an independent sealed hollow. Most preferably.

Further, the number of such internal plate-like ribs, their positions, rib thickness, etc. are appropriately determined depending on the thickness and size of the structure and the strength required for the structure, and are not particularly limited. The rib thickness does not necessarily have to be uniform, and it may change for each rib.
The ribs may be different at the upper and lower ends and the central portion, and the height of the rib is a major factor in determining the thickness and strength of the hollow structure, and is appropriately determined as necessary.

In such a hollow structure, for the purpose of manufacturing a pallet as a final product, for example, the hollow space partitioned by the internal plate ribs is a rectangular parallelepiped in terms of forming a fork insertion port. It is preferable.
In this case, the rectangular parallelepiped as a hollow space does not mean that each of the surfaces forming the hollow space is an exact flat surface, but the shape and manufacturing process of the internal plate-like ribs as described above. Due to the above reasons, each surface may be slightly uneven or each corner may be rounded.

In the hollow structure with ribs of the present invention, in such a hollow structure, a part or all of the outer peripheral plate-shaped ribs and / or the inner plate-shaped ribs is either a top plate surface and / or a bottom plate surface. One or both of the peripheral edges or the plate surface is passed to extend in the plane direction to the hollow outside by an arbitrary length, and these ribs and extended ribs are integrated with the top plate and the bottom plate in the same base material. It has a different structure. Here, the surface direction in the above indicates a direction in which the plate surface of the outer peripheral plate-shaped rib or the inner plate-shaped rib extends in the height direction and intersects with the top plate surface or the bottom plate surface, for example, the top plate surface or the bottom plate. When the planes are arranged in parallel, the direction perpendicular to the planes is shown. Further, passing the peripheral edge means that the outer peripheral plate-like rib integrally joined to the peripheral end surface (four side surfaces) of the top plate or the bottom plate is L-shaped relative to the bottom plate surface from the peripheral end as it is. It means a state in which the ribs are extended in the height direction, and passing through a plate surface means a state in which the ribs penetrate the plate surface to which the internal plate-like ribs are joined and extend in a T shape with respect to the surface. It is meant.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows an example of a hollow structure with ribs according to the present invention. FIG. 1 (a) shows its appearance and FIG. 1 (b) shows FIG. 1 (a).
1 (c) is a sectional view of the ribbed hollow structure of FIG. 1 (a) taken along line B-A.
Each fractured surface when cut at B is shown. FIG. 2 shows FIG.
2A and 2B show internal states of the ribbed hollow structure shown in FIG. 2A when viewed from various directions, in which a dotted line indicates a structure line that does not appear outside, a solid line indicates a structure line observed from the outside, and FIG.
2A shows a state of the bottom plate side when viewed from the top plate, FIG. 2B shows a front face thereof, and FIG. 2C shows a state when the top plate side is viewed from the bottom plate. . Further, FIG. 3 is a partial perspective view showing a state where the internal plate-shaped ribs and the internal plate-shaped extended ribs are integrated with the base material in the ribbed hollow structure of the present invention.

Here, 1 is a top plate, 2 is a bottom plate, 3 is a hollow space, 4 is an internal plate-shaped rib, 4'is an internal plate-shaped extended rib extended from the internal plate-shaped rib, and 5 is an outer peripheral plate-shaped. The ribs 5'indicate peripheral plate-shaped extended ribs extended from the peripheral plate-shaped ribs, respectively. The top plate and the bottom plate are names provided for convenience in order to distinguish the upper and lower layers forming the hollow portion, and the names have no special meaning, but in the present specification, the extension rib is When provided on either the top plate surface and / or the bottom plate surface, the surface on the side where the extension rib is provided is the bottom plate, and the opposite extension rib is not provided and the surface is The smooth surface is often called the top plate.

The hollow structure illustrated in FIGS. 1 and 2 has a rectangular top plate 1 arranged in parallel so that the surfaces thereof face each other.
On each of the four circumferences of the bottom plate 2 and the bottom plate 2, outer peripheral plate ribs 5 are provided so that the corresponding peripheral ends are integrally connected to form a side wall, and the inside has a hollow shape. The inner plate-shaped rib 4 is parallel to each side of the top plate 1 and the bottom plate 2, and the plate surface of the rib is perpendicular to the top plate surface and the bottom plate surface, and is substantially the same as the height of the inner plate rib. The structure has a large number of hollow spaces 3 which are provided in a grid pattern so as to be evenly spaced in length and width and which are partitioned by the internal plate-shaped ribs 4.

In the ribbed hollow structure of the present invention, with respect to either or both of the internal plate-shaped ribs 4 and the outer peripheral plate-shaped ribs 5, some or all of these ribs are further hollow in the plane direction. Internal plate-like extension ribs 4'and / or outer peripheral plate-like extension ribs 5'extended to the outside as they are
However, in practice, it is preferable that both the inner plate-shaped rib 4 and the outer peripheral plate-shaped rib 5 have extension ribs. Further, such extension ribs may be provided in the surface direction of both the top plate and the bottom plate, but generally, they are provided only in one of the surface directions.

Here, the outer peripheral plate-shaped extending rib 5'is extended as it is to the outside in the plane direction so that the outer peripheral plate-shaped rib 5 passes through the peripheral edge of the bottom plate and becomes L-shaped with respect to the bottom plate. Even if the outer peripheral plate-shaped extension rib 5'is provided as a plate-shaped rib, it is not necessary to provide it on all four circumferences of the top plate and the bottom plate, and four peripheral ends depending on the purpose of use as a product. It may be provided on at least one of the peripheral ends, and at one peripheral end, not the entire length thereof,
It may be partially provided. For example, when the ribbed hollow structure is for a pallet, as shown in FIGS. 1 and 2, for both left and right peripheral ends, the outer peripheral plate-shaped extension ribs 5 ′ are extended as they are over the entire length of the side ends. The outer peripheral plate-shaped extension ribs 5 ′ may be provided at both front and rear peripheral ends of the front and rear peripheral ends except for the fork insertion port. In the latter case, which length of the front and rear peripheral edges is to be extended and which length may be arbitrarily determined according to each purpose. Outer peripheral plate-shaped extended ribs 5 ′ are provided at least at both left and right ends in the vertical direction, and the outer peripheral plate-shaped extended ribs and the outer peripheral plate-shaped extended ribs from the left and right side ends are at respective corner portions orthogonal to each other in their plate surfaces. It is preferable to join the ends of both ribs.

Further, the internal plate-shaped extension rib 4'is extended as it is to the hollow outside in the plane direction so that the internal plate-shaped rib 4 passes (penetrates) the bottom plate and becomes T-shaped with respect to the bottom plate. It is not necessary that the internal plate-shaped extension ribs 4 ′ are provided corresponding to all the internal plate-shaped ribs 4, and they may be partially provided, or It is not necessary for the internal plate-shaped extension ribs 4'to be provided over the entire length of the ribs, and they may be partial in their length. For example, when the hollow structure with ribs is for a pallet, as shown in FIGS. 1 and 2, the length of the inner plate-shaped ribs 4 provided in the width direction of the top plate 1 and the bottom plate 2 is increased. Regarding the ribs near both ends in the direction, the internal plate-shaped extension ribs 4'extended in the surface direction are provided over the entire length in the width direction, but the central portion in the length direction and the portion corresponding to the fork insertion port. No internal plate-shaped extension ribs are provided, and the internal plate-shaped ribs 4 provided in the lengthwise direction of the top plate 1 and the bottom plate 2 are at the central portion in the lengthwise direction and are fork-inserted. The internal plate-shaped extension ribs are not provided in the portion corresponding to the mouth, and the internal plate-shaped extension ribs are provided only in both ends thereof.

The thickness w of the plate surfaces of the inner plate-shaped ribs 4'and the outer plate-shaped ribs 5'extended from the inner plate-shaped ribs 4 and the outer plate-shaped ribs 5 is as follows. It may be different from the outer peripheral plate rib 5, and the height t of the extension rib (protruding length from the bottom plate surface) does not have to be the same for all extension ribs, and the required strength of the structure or The shape may be appropriately determined depending on the shape and purpose of use. For example, it is possible to obtain the final product having a three-layer structure by joining the rib tip portions of the two ribbed hollow structures by means such as fusion bonding. In the case of the purpose, it is preferable that the plate surfaces of the extension ribs have the same thickness and height.

In the hollow structure with ribs of the present invention, the inner plate-shaped ribs 4, the outer peripheral plate-shaped ribs 5, the inner plate-shaped extended ribs 4'and the outer plate-shaped extended ribs 5'are the top plate 1 and the base plate. The fact that the bottom plate 2 is integrated with the same base material is very important for maintaining the strength of the structure.

The material of such a hollow structure with ribs is not particularly limited, but synthetic resin, especially thermoplastic resin is preferable because each rib is easy to be integrated with the top plate and the bottom plate which are base materials and in terms of manufacturing. preferable. Examples of such thermoplastic resin include, but are not limited to, polyethylene resin, polypropylene resin, polyamide resin, polyethylene terephthalate resin, acrylonitrile-butadiene-styrene resin (ABS resin), polyvinyl chloride resin, polycarbonate resin and the like. Not a thing. Further, it may be a modified product or a mixture of these thermoplastic resins, or a polymer alloy. Of course, in these thermoplastic resins, various fillers having good affinity with the resin, for example, glass fibers, inorganic fibers such as carbon fibers, talc, clay,
One or more kinds of inorganic particles such as silica and calcium carbonate may be blended as necessary.
Various commonly used additives such as an antioxidant, an ultraviolet absorber, a colorant, a flame retardant, and a low shrinkage agent may be appropriately blended. Further, the thermoplastic resin as the base material may be in a non-foamed state, or may be in a foamed state in which it is foamed up to about twice.

In the hollow structure with ribs of the present invention, when the internal plate-shaped extension ribs 4'and the outer peripheral plate-shaped extension ribs 5'are provided only in the surface direction of either the top plate or the bottom plate, the extension is performed. If necessary, a skin material may be attached to the flat plate surface not provided with the ribs. Examples of such a skin material include woven cloth, non-woven cloth, knitted cloth, wire mesh, mesh made of fiber or thermoplastic resin, metal foil, sheet or film of thermoplastic resin or thermoplastic elastomer. Further, as a skin material, a polyolefin resin, a polyvinyl chloride resin, a thermoplastic resin such as polystyrene, a thermosetting resin such as a polyurethane resin, or a foam such as rubber such as cis-1,4-polybutadiene and ethylene-propylene copolymer is used. You may use. Such a skin material may be used alone or as a laminate in which two or more kinds are laminated, and the surface thereof is provided with an uneven pattern such as a grain, printing, dyeing and the like. It is also possible to use a decorated one.

Further, in order to prevent the slipperiness of the surface of the flat plate, a non-slip member made of a material having a large friction coefficient, or a continuous or discontinuous member made of the same base material as the top plate is provided. It is effective to provide a raised object.
Examples of the material having a large friction coefficient used for the purpose of the non-slip member include various rubbers, ethylene-vinyl acetate copolymers, thermoplastic elastomers, etc., and these are sheet-like materials on the whole or part of the top plate surface. May be stuck together, or may be stuck in a band shape or a string shape, or may be provided as a grommet.

When a continuous or discontinuous protrusion made of the same base material as the top plate is provided, the cross-sectional shape of the protrusion varies depending on the purpose of use. Is usually about 0.5 to 5 mm, preferably 1 to 2 mm. The width of the protrusions, the distance between the protrusions, the length, and the like are appropriately selected depending on the size of the pallet and the articles to be loaded.
20 mm, preferably 1.5 to 3 mm, the distance is generally 1 to 30 cm, preferably 5 to 10 cm, and the length is generally 5 to the width of the pallet or the depth of the pallet, preferably Is less than half the width of the pallet.

Such a hollow structure with ribs of the present invention is
It can be produced by a method similar to the method for producing a hollow body by the gas injection method. For example, in the case of the gas injection method, a mold in which a concave portion corresponding to an extension rib is provided on the mold surface of the lower mold is used, and after the molten thermoplastic resin is supplied between the upper and lower molds that are opened. Close the mold, and then slowly open the mold and inject pressurized gas from the gas injection port provided in the mold surface near the concave part of the mold to pull up the molten resin at the upper end of each concave part to the upper mold. Thus, it can be manufactured by forming a hollow space at the same time while forming the internal plate-shaped rib, and then cooling to solidify the molten resin.

In the hollow structure with ribs according to the present invention, a part or all of the outer peripheral plate ribs and / or the inner plate ribs constituting the hollow structure has a top plate surface and / or a bottom plate surface. One or both of the peripheral edges or the plate surface is passed to extend in the plane direction to the hollow outside by an arbitrary length, and these ribs and extended ribs are integrated with the top plate and the bottom plate in the same base material. Therefore, it has an excellent feature that it can be easily applied to products having a complicated structure, and that the extension rib makes it easy to join to other members and parts. It is useful.

For example, as shown in FIG. 4, such a pallet has an internal plate-shaped extension rib 4'and an outer peripheral plate-shaped on either side of the top plate or the bottom plate except for the portion corresponding to the fork insertion port. The hollow structure with two ribs having the same structure provided with the extension ribs 5'can be easily manufactured by abutting the tips of the extension ribs and joining them by heat fusion, and thus obtained. The pallet also has a plurality of hollow spaces in the middle layer portion where the fork insertion port is provided by joining the tips of the extension ribs, which makes it lightweight and excellent in strength. .

[0027]

The hollow structure with ribs of the present invention has excellent features such as light weight, excellent strength, and easy joining to other members and parts. However, it is extremely useful for pallets. It is useful.

[Brief description of drawings]

FIG. 1 shows an example of a hollow structure with ribs according to the present invention, in which (a) shows its appearance and (b) shows A in (a).
-A shows a fracture surface of a piece cut by A, and (c) shows a fracture surface of a piece cut by BB in (a).

2A and 2B show the internal state of the ribbed hollow structure of FIG. 1A, in which FIG. 2A is a side view and a side view when the bottom plate side is viewed from the top plate side, and FIG. , (C) show states when the top plate side is viewed from the bottom plate side.

FIG. 3 is a partial perspective view showing a state where internal plate-shaped ribs and internal plate-shaped extended ribs are integrated with a base material in the hollow structure with ribs of the present invention.

FIG. 4 is a state in which a pallet is manufactured by joining the extended rib sides of the hollow structure with ribs of the present invention,
(A) shows the state before joining, (b) shows the state after joining, and (c) shows the appearance of the obtained pallet.

[Explanation of symbols]

 1: Top plate 2: Bottom plate 3: Hollow space 4: Internal plate-shaped rib 4 ': Internal plate-shaped extended rib 5: Peripheral plate-shaped rib 5': Peripheral plate-shaped extended rib 6: Fork insertion port

Claims (7)

[Claims] 1. An outer peripheral plate-shaped rib connecting the four circumferences of a top plate and a bottom plate arranged such that their surfaces face each other, and a plurality of internal plates connecting the opposing top plate surface and bottom plate surface at arbitrary intervals. A hollow structure having a plurality of hollow spaces partitioned by ribs, wherein a part or all of the outer peripheral plate ribs and / or the inner plate ribs is either a top plate surface and / or a bottom plate surface. Alternatively, the ribs and the extension ribs are passed through both peripheral ends or the plate surface and extend in the plane direction to the outside of the hollow with an arbitrary length, and these ribs and extended ribs are integrated with the top plate and the bottom plate by the same base material. A hollow structure with a rib characterized by the above. 2. The hollow structure with ribs according to claim 1, wherein the hollow space is a rectangular parallelepiped. 3. The extension rib is provided only in the surface direction of either the top plate surface or the bottom plate surface.
The hollow structure with ribs according to item 1. 4. The hollow structure with ribs according to claim 3, wherein a skin material is attached to a part or the whole of the top plate surface or the bottom plate surface on which the extension ribs are not provided. 5. The ribbed hollow structure according to claim 3, wherein an anti-slip member is provided on a part or the whole of the top plate surface or the bottom plate surface on which the extension rib is not provided. 6. A continuous or discontinuous projecting member made of the same base material as that of the hollow structure is integrally provided on a top plate surface or a bottom plate surface not provided with extension ribs. The hollow structure with ribs according to claim 3. 7. A hollow structure with ribs, wherein two of the hollow structures according to claim 3 are fused at the tip ends of extension ribs.