JP5101252B2 - Plastic pallet - Google Patents

Description

  The present invention relates to a high-strength synthetic resin pallet having a large bending rigidity.

  Examples of this type of synthetic resin pallet include those described in Patent Documents 1 to 3.

JP 2003-170941 A (FIG. 2 etc.) JP 2003-63528 A (FIG. 2) Japanese Patent Laying-Open No. 2004-10129 (FIG. 1)

  In the pallet described in Patent Document 1, the inner layer and the outer layer have a two-layer structure having recesses by blow molding, so that the thickness tends to vary and the recesses require strength. When the bottom part of the pallet is thin, the strength of the entire pallet is lowered.

  In order to solve this problem, it is conceivable to produce the entire pallet by injection molding with relatively good dimensional accuracy. However, for injection molding, it is necessary to use a low-molecular weight resin material with high fluidity, in other words, a material with low mechanical strength, so a pallet with high bending rigidity cannot be obtained, and the strength is increased by increasing the wall thickness. If you try to increase the weight, the weight of the pallet will increase.

  Each of the pallets described in Patent Documents 2 and 3 has a single structure, and the upper surface of the spar that protrudes downward is recessed downward, so that the thickness must be increased. A large bending rigidity cannot be obtained, and in this way, the weight of the pallet increases as described above.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a high-strength synthetic resin pallet having high bending rigidity while suppressing an increase in weight.

In order to solve the above-mentioned problems, the synthetic resin pallet according to claim 1 of the present invention is lightweight on the upper surface of a base plate made of synthetic resin having a plurality of fork insertion girder portions protruding downward on the lower surface. By fixing a reinforcing plate made of synthetic resin , attaching a deck plate for article placement on the upper surface of the reinforcing plate, and providing a plurality of recesses on at least one of the opposing surfaces of the reinforcing plate and the deck plate, It is characterized in that a space is formed between the opposing surfaces .
According to this feature, a high-strength pallet with high bending rigidity can be provided by fixing the reinforcing plate to the upper surface of the base plate to form a two-layer structure. Further, since the strength is increased, the thickness of the base plate can be minimized, and the reinforcing plate is made of a lightweight synthetic resin, so that the weight of the pallet does not increase. Furthermore, even if a deck plate is provided to form a three-layer structure, an increase in the weight of the pallet can be minimized.

The synthetic resin pallet according to claim 2 of the present invention is the synthetic resin pallet according to claim 1,
A rib in a plan view is projected upward on the upper surface of the base plate, and a reinforcing plate is brought into contact with and fixed to the upper surface of the rib so that a space is provided between the opposing surfaces of the base plate and the reinforcing plate. It is characterized by the formation.
According to this feature, the base plate is reinforced by the grid-like ribs, and the space is formed between the surfaces facing the reinforcing plate, so that the pallet is lightened.

The synthetic resin pallet according to claim 3 of the present invention is the synthetic resin pallet according to claim 1 or 2,
The reinforcing plate is made of any one of plastic cardboard, plastic bubble board, plastic honeycomb board, and plastic low foam board.
According to this feature, since any member is relatively strong and lightweight, the strength can be increased while reducing the weight of the reinforcing plate and the pallet.

The synthetic resin pallet according to claim 4 of the present invention is the synthetic resin pallet according to any one of claims 1 to 3,
A plurality of concave portions are provided on one of the opposing surfaces of the base plate and the reinforcing plate, and a convex portion to be fitted to the concave portion is provided on the other side. It is characterized in that a reinforcing plate is fixed.
According to this feature, since the coupling area between the base plate and the reinforcing plate is increased, the bending rigidity of the pallet is further increased.

The synthetic resin pallet according to claim 5 of the present invention is the synthetic resin pallet according to any one of claims 1 to 4,
The base plate is formed by injection molding, and at the same time as the injection molding, the reinforcing plate is integrally fixed to the base plate by insert molding.
According to this feature, a high-precision base plate can be formed by injection molding, and the base plate and the reinforcing plate are firmly bonded, so that they do not peel off and a high-strength pallet is obtained. .

The synthetic resin pallet according to claim 6 of the present invention is the synthetic resin pallet according to any one of claims 1 to 5 ,
The deck board is formed by injection molding.
According to this feature, various deck plates having different top surface shapes can be easily and accurately formed.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 3 show a first embodiment of a synthetic resin pallet (hereinafter abbreviated as a pallet) according to the present invention. A pallet 1 of this embodiment includes a base plate 2 having a square shape in plan view, It consists of a reinforcing plate 3 which is fixed to the upper surface and is formed in a substantially “well” shape by cutting out a slightly smaller square than the base plate 1.

  The base plate 1 is formed by injection molding a synthetic resin material, and a plurality of (9 in this embodiment) beam portions 4 project downward from the lower surface, and between adjacent beam portions 4 is a forklift. It is a fork insertion recess 5. An edge piece 6 that rises upward is formed on the outer peripheral edge of the upper end of the base plate 1, and ribs 7 that are lattice-like in plan view face upward on the upper surface that is surrounded by the edge piece 6 and is slightly recessed downward. Projected.

  The reinforcing plate 3 is formed of a lightweight synthetic resin so as to be fitted to an inner upper surface surrounded by the edge 6 of the base plate 2. As shown in the cross-sectional view of FIG. 3, the reinforcing plate 3 of this embodiment is a three-layer plastic bubble board formed by thermally welding sheets 9 and 9 on both upper and lower surfaces of a core material 8 having an uneven cross section. (Product name Plastic Pearl) is used. In addition to the plastic foam board, for example, a plastic corrugated board, a plastic honeycomb board, a plastic low foam board, or the like may be used.

  After placing the reinforcing plate 3 on the upper surface of the rib 7 in the base plate 2, the pallet 1 is formed by fixing the contact portion with the base plate 2 by heat fusion, high frequency welder, adhesion or the like. .

  Further, when the base plate 2 is injection-molded without using the fixing means as described above, the pre-formed reinforcing plate 3 may be integrally formed with the base plate 2 by insert molding. By doing so, the reinforcing plate 3 can be firmly coupled.

  In the pallet 1 according to the first embodiment, the reinforcing plate 3 is fixed to the upper surface of the base plate 2 and the whole has an upper and lower two-layer structure. Therefore, the bending rigidity is large and the strength is increased. Further, as shown in the cross-sectional view of FIG. 3, since the lattice-like ribs 7 project from the upper surface of the base plate 2, the bending rigidity of the pallet 1 is further increased. Furthermore, as shown in the cross-sectional view of FIG. 3, a space S is formed on the opposing surface of the base plate 2 and the reinforcing plate 3, and the reinforcing plate 3 is made of a lightweight synthetic resin. The increase in weight is minimal.

  In addition, among the plurality of upwardly opening recesses formed on the upper surface of the base plate 2 by the lattice-like ribs 7, the recesses corresponding to the girder portions 4 are opened upward even when the reinforcing plate 3 is fixed. Therefore, as shown in FIG. 3, the plurality of pallets 1 are nested and stored and transported by fitting the spar 4 of the upper pallet 1 into the recesses opened upward. It is possible.

  4 to 6 show a second embodiment of the pallet according to the present invention. This pallet 10 is arranged on the top surface of the reinforcing plate 3 in the pallet 1 of the first embodiment to place a deck for placing articles. The plate 11 is fixed. The deck plate 11 is made of an injection-molded product, and the contact portion with the reinforcing plate 3 or the base plate 2 is joined by fixing means such as heat fusion, high frequency welder, adhesion, etc. as described above.

  In addition, the shape of the upper surface of the deck board 11 is made into an appropriate shape according to the shape of the article to be placed.

  Since the pallet 10 of the second embodiment has an upper and lower three-layer structure, it has a higher bending rigidity and a higher strength pallet than the pallet 1.

  7 to 9 show a third embodiment of the pallet of the present invention. The pallet 12 of this embodiment is configured by fixing a reinforcing plate 15 having a number of inverted frustoconical downward projections 14 on the upper surface of a base plate 13 slightly larger than the base plate 2 of the above embodiment. Has been. The upper surface of each downward convex portion 14 is a bottomed concave portion 16. Both the base plate 13 and the reinforcing plate 15 are formed by injection molding.

  On the upper surface of the base plate 13 surrounded by the edge pieces 17, lattice-like ribs 18 project upward, and the downward convex portions of the reinforcing plate 15 are formed in a number of rectangular concave portions 19 defined by the ribs 18. In a state where 14 is fitted, the reinforcing plate 15 is fixed to the upper surface of the base plate 13 by the same fixing means or insert molding as described above.

  Also in the pallet 12 of this embodiment, lattice-like ribs 18 project from the upper surface of the base plate 13, and the downward convex portions 14 of the reinforcing plate 15 are fitted into a large number of concave portions 19 partitioned by the ribs 18. In addition, since the mutual coupling area is increased, the bending rigidity of the pallet 12 is increased.

  10 and 11 show a fourth embodiment of the pallet of the present invention. The pallet 20 of this embodiment is placed on the upper surface of the reinforcing plate 15 in the pallet 12 of the third embodiment. A deck board 21 is attached. The deck plate 21 is made of an injection-molded product, and is fixed to the upper surface of the reinforcing plate 15 or is press-fit to the upper surface of the outer peripheral portion of the base plate 13 so as to be removable.

  The interior of the upward protrusion 22 in the deck plate 21 is preferably hollow. In this way, the deck plate 21 can be stored and transported by nesting as a single product, and with the recess 16 formed on the upper surface of the reinforcing plate 15. Since a space is formed between the opposing surfaces, the weight of the pallet 20 can be reduced.

  Also in the pallet 20 of the fourth embodiment, since it has an upper and lower three-layer structure, the pallet has a high bending rigidity and a high strength.

  The present invention is not limited to the above embodiment.

  In each of the first to fourth embodiments, the grid-like ribs 7 and 18 are projected from the upper surfaces of the base plates 2 and 13, but the ribs 7 and 18 are omitted. Sometimes. At this time, in the third and fourth embodiments, a recess that complements the downward projection 14 of the reinforcing plate 15 may be formed on the upper surface of the base plate 13.

It is a disassembled perspective view of the pallet of the 1st Embodiment of this invention. Similarly, it is a perspective view after combination. FIG. 3 is an enlarged longitudinal sectional side view taken along line II-II in FIG. 2. It is a disassembled perspective view of the pallet of the 2nd Embodiment of this invention. Similarly, it is a perspective view after combination. FIG. 6 is an enlarged longitudinal side view taken along line VI-VI in FIG. 5. It is a disassembled perspective view of the pallet of the 3rd Embodiment of this invention. Similarly, it is a perspective view after combination. It is an expanded vertical side view along the VII-VII line of FIG. It is a disassembled perspective view of the pallet of the 4th Embodiment of this invention. Similarly, it is a perspective view after combination.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pallet 2 Base plate 3 Reinforcement plate 4 Girder part 5 Concave part 6 Edge piece 7 Rib 8 Core material 9 Sheet 10 Pallet 11 Deck board 12 Pallet 13 Base board 14 Downward convex part 15 Reinforcement board 16 Recessed part 17 Edge piece 18 Rib 19 Concave part 20 Pallet 21 Deck plate 22 Upward projecting part S Space

Claims (6)

A reinforcing plate made of lightweight synthetic resin is fixed to the upper surface of a base plate made of synthetic resin with a plurality of fork insertion girder portions protruding downward on the lower surface, and a deck plate for article placement on the upper surface of the reinforcing plate A synthetic resin pallet in which a plurality of recesses are provided in at least one of the opposing surfaces of the reinforcing plate and the deck plate to form a space between the opposing surfaces .   A rib in a plan view is projected upward on the upper surface of the base plate, and a reinforcing plate is brought into contact with and fixed to the upper surface of the rib so that a space is provided between the opposing surfaces of the base plate and the reinforcing plate. The synthetic resin pallet according to claim 1 formed.   The synthetic resin pallet according to claim 1 or 2, wherein the reinforcing plate is made of any one of a plastic cardboard, a plastic foam board, a plastic honeycomb board, and a plastic low foam board.   A plurality of concave portions are provided on one of the opposing surfaces of the base plate and the reinforcing plate, and a convex portion to be fitted to the concave portion is provided on the other side. The pallet made from a synthetic resin in any one of Claim 1 thru | or 3 which fixed the reinforcement board.   The synthetic resin pallet according to any one of claims 1 to 4, wherein the base plate is formed by injection molding, and at the same time as the injection molding, the reinforcing plate is integrally fixed to the base plate by insert molding. The synthetic resin pallet according to any one of claims 1 to 5, wherein the deck board is formed by injection molding.

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