JP2006248541A - Synthetic resin pallet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pallet which reduces the deformation of a lower deck board when the pallet is placed on a rack in an automatic warehouse. <P>SOLUTION: The synthetic resin pallet is made by connecting an upper deck board and a lower deck board via four corner beams, intermediate beams, and a center beam. A space encircled with the beams and the upper/lower deck boards is used as a fork inserting opening. Latticed ribs, which cross laterally and vertically each other, are provided under a top board of an internal part that is encircled with the corners of the four corner beams, the intermediate beams, and the center beam. A diagonal reinforcing rib is formed between any one of the latticed ribs and the peripheral wall of each beam. The diagonal rib is preferably formed between the peripheral wall of each beam and one or a plurality of ribs closer to the beams out of the latticed ribs crossing each other in the internal part encircled with the corners of the four corner beams, the intermediate beams, and the center beam. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a synthetic resin pallet for forklifts used for storage and transportation of luggage, and more particularly to a synthetic resin pallet that is placed and stored on a pallet receiving member of a rack shelf of an automatic warehouse.

  In recent years, forklift pallets used for storing and transporting luggage have been used with a lot of synthetic resin pallets, but there is a problem that they are more easily deformed than wooden pallets. FIG. 7 shows a pallet placed on a rack shelf of an automatic warehouse. The pallet 1 connects an upper deck board 3 and a lower deck board 4 with girders 5 at both ends and an intermediate girder 6 provided in the middle, and a fork insertion port that is surrounded by the girders and the upper and lower deck boards. 7.

  In addition, reinforcing ribs are provided on the lower surfaces of the upper deck board 3 and the lower deck board 4 in the vertical and horizontal directions to prevent deformation. The upper and lower end surfaces of the girders 5 and the intermediate girders 6 are closed by the upper deck board 3 and the lower deck board 4, and are formed in a closed hollow structure as a whole.

  As shown in FIG. 7, the shelf device 10 of the three-dimensional automatic warehouse is mounted with a plurality of columns 11 standing at predetermined intervals and adjacent columns 11 at predetermined intervals along the vertical direction. The pallet receiving member 12 is supported. When the pallet receiving member 12 constitutes a rack shelf and the pallet 1 on which the load 8 is placed is placed on the pallet receiving member 12 and stored, a load is placed on the pallet 1 in the direction of the arrow by the loaded load 8. Take it. In the pallet 1, the upper deck board 3 and the lower deck board 4 are deformed like a one-dot chain line by weighting.

  Therefore, in order to reduce the amount of deformation of the pallet, in the two-way pallet, a girder is placed over the pallet receiving member 12 and placed in the four-way pallet. The smaller one is placed on the pallet receiving member 12 and placed.

However, it was not possible to prevent deformation only by changing the direction of the pallet. If the deck board is deformed, not only can the luggage be placed in a stable state, but also there is a risk of collapse. Moreover, if it is kept in a deformed state for a long time, the pallet will be permanently deformed. As a pallet for preventing such deformation of the deck board, there is a pallet described in JP-A-2001-213432.
JP 2001-213432 A

  In the pallet described in the above publication, the first rectangular reinforcing rib is formed on the inner side surface of the upper deck board by the vertical and horizontal reinforcing ribs connected at the corners of the adjacent girders, and further, the connecting ribs provided in the girders are used. The second rectangular reinforcing rib is formed by connecting the reinforcing rib vertically and horizontally through the girder wall.

  The pallet described in the above publication is intended to prevent the deformation of the deck board by reinforcing the connecting portion between the upper deck board and the girder, but is not necessarily deformed only by reinforcing the deck board at the portion connecting the girder. Cannot be sufficiently prevented.

  Further, in the conventional four-way pallet, in order to enable the use of a hand lift (manual small forklift) or a pallet truck, the lower deck board 4 is provided with four corner girds 5, intermediate girders 6 and a central girder. A relatively large opening may be provided in a portion surrounded by the girders. Thus, in a pallet having a structure in which a large opening is provided in the lower deck board, deformation due to a load is further increased.

  An object of the present invention is to provide a synthetic resin pallet that can be safely stored with a small amount of deformation even when placed on a rack shelf of an automatic warehouse.

  In order to achieve the above object, the present invention has the following configuration. That is, the synthetic resin pallet according to the present invention connects the upper deck board and the lower deck board with four corner girders, the middle girders and the middle girders, and is surrounded by the girders and the upper and lower deck boards. This is a plastic pallet with a fork insertion hole, which crosses vertically and horizontally below the top plate of the inner part surrounded by the four corner girders, the middle girders, and the corners of the middle girders A rib is provided, and an oblique reinforcing rib is provided between any of the lattice ribs and the peripheral wall of each girder.

  Of the crossed lattice ribs provided in the inner part surrounded by the four corner girders, the middle girders, and the corners of the central girders, one or more ribs near the girders and the peripheral walls of the girders It is preferable to provide diagonal reinforcing ribs between them. Further, the cross-sectional area of one or a plurality of ribs close to each other among the crossed lattice ribs provided in the inner part surrounded by the corners of the four corners, the middle part thereof, and the corner part of the central part It is preferable to form larger than the cross-sectional area of the rib.

  Further, under the top plate in the four corner girders, the middle girders, and the middle girders, reinforcing ribs that are parallel and perpendicular to the side surface of the deck board are provided, and among the orthogonal reinforcing ribs, A range surrounded by the reinforcing rib closest to the fork insertion opening side in the longitudinal direction (frontage direction) and the peripheral wall of the girder is a reinforcing part, and the plurality of reinforcements are provided in the longitudinal direction (frontage direction). It can be formed by a rib and a thick portion in which the thickness of the deck board is thicker than the thickness of the other portions of the deck board.

  The synthetic resin pallet of the present invention is provided between a reinforcing rib provided on a top plate of a portion surrounded by four corner girders, a middle girder and a central girder corner, and a peripheral wall of the girders. Since the diagonal reinforcing rib is provided, the portion other than the portion connecting the girders is reinforced, and the whole is reinforced. Accordingly, the deformation of the deck as well as the deformation of the deck board is prevented, and the luggage can be stably placed on the rack shelf of the automatic warehouse.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing a part of the pallet 20. The pallet 20 is formed by connecting an upper deck board 21 and a lower deck board 22 with four corner girders 23, a gird 24 provided in the middle thereof, and a gird 25 provided in the center, and the upper deck board 21 and the lower deck board 22. And a four-way pallet having a fork insertion port 26 defined by a gap surrounded by the four corner girders 23 and the middle digit 24. The pallet is formed by abutting and welding the upper part M and the lower part N, which are separately formed in advance, in the middle of the girders, and the four corner girds 23, the middle girders 24 and the central girders 25 have a hollow structure.

  2 to 6 show a size of a quarter of the upper part including the corner, and the upper deck board 21 includes a top plate 28 and a reinforcing rib group 30 provided vertically and horizontally below the top plate 28. Is formed by. The reinforcing rib group 30 is composed of reinforcing ribs 31, 32, 33, 34 and 35.

  As shown in FIG. 2, when the longitudinal direction (frontage direction) X and the short direction (depth direction) Y are used, the reinforcing ribs 31 are reinforcing ribs provided between the four corner girders 23 and the intermediate girders 24a. Yes, the reinforcing rib 32 is a reinforcing rib provided between the four corner spar 23 and the intermediate part spar 24b, and the reinforcing rib 33 is provided between the intermediate part spar 24a and the central part spar 25. The reinforcing ribs 34 are reinforcing ribs provided between the intermediate beam 24b and the central beam 25. The reinforcing ribs 35 include four corner beams 23, intermediate beams 24a, It is a reinforcing rib provided in the inner portion surrounded by the inner corner of 24b and the corner of the girder 25 at the center.

  More specifically, as shown in FIG. 2, the reinforcing ribs 31, 32, 33, 34, and 35 are all formed in a lattice shape vertically and horizontally. The reinforcing rib 31 includes a lateral rib 31a parallel to the side surface in the longitudinal direction (frontage direction) X and a vertical rib 31b parallel to the side surface in the short side direction (depth direction) Y. It consists of a horizontal rib 34a parallel to the side surface in the longitudinal direction (frontage direction) X and a vertical rib 34b parallel to the side surface in the short side direction (depth direction) Y.

  The horizontal ribs 31a and the horizontal ribs 34a are formed with a narrow interval in order to prevent deformation of the upper deck board 21 in the longitudinal direction (frontage direction) X. In the illustrated embodiment, seven horizontal ribs 31a are provided within the width dimension in the lateral direction (depth direction) Y of the four corner girders 23 and the middle girders 24a, and the horizontal ribs 34a are four corner girders. Thirteen are provided within the width dimension in the lateral direction (depth direction) Y of 24b and the girder 25 at the center. Three orthogonal vertical ribs 31b and three vertical ribs 34b are provided.

  Further, the reinforcing ribs 35 of the inner part surrounded by the inner corners of the four corner girds 23 and the middle girders 24a and 24b and the corners of the central girders 25 are arranged on the side surfaces in the longitudinal direction (frontage direction) X. It consists of a horizontal rib 35a parallel to the side and a vertical rib 35b parallel to the side surface in the lateral direction (depth direction) Y.

  Of the transverse ribs 35a, three of the four corners 23 and the middle part 24a are closer to the middle part 24b and the middle part 24b and the middle part 25 are closer than the cross-sectional area H1 of the other ribs. The area H2 is large (see FIG. 5). Of the vertical ribs 35b, one of the four corner spar 23 and the middle part 24b and one of the middle part 24a and the central part 25 are closer to the cross-sectional area H1 of the other ribs. The cross-sectional area H2 is also large (see FIG. 3).

  As described above, the strength was increased by forming the horizontal ribs 35a and the vertical ribs 35b in the vicinity of the girders with a large cross-sectional area. Furthermore, in this embodiment, in order to reinforce the deck board, diagonal reinforcing ribs 40, 41 and 42 are provided from the intersections of the horizontal ribs 35a and the vertical ribs 35b toward the peripheral walls of the girders. The diagonal reinforcing ribs 42 intersect with the vertical ribs of the reinforcing ribs 32 and 33.

  Next, the internal structure of each digit will be described. Reinforcing ribs 45, 46, 47, and 48 that are parallel to and perpendicular to the side surface of the deck board are provided inside the four corner girds 23, the middle girders 24a and 24b, and the middle girders 25. A plurality of reinforcing ribs 45a, 46a, 47a and 48a arranged in parallel in at least the longitudinal direction (frontage direction) X are provided at right angles to the side surfaces. In the illustrated embodiment, three each are provided.

  A range surrounded by the reinforcing ribs 45a, 46a, 47a and 48a closest to the fork insertion opening 26 side opened in the longitudinal direction (frontage direction) X and the peripheral wall of the girder is a reinforcing portion H. The reinforcing portion H is formed by reinforcing ribs 50 and reinforcing ribs 51 provided in the longitudinal direction (frontage direction) X and thick portions 53 in which the thickness of the top plate 28 is increased. Although the reinforcing rib 50 and the reinforcing rib 51 are not provided on the extension of the reinforcing ribs 31 and 34, they are provided on the extension of the reinforcing ribs 31 and 34 and are linearly arranged through the peripheral wall of the girder. You may form so that it may connect.

  Further, portions of the reinforcing ribs 50 and 51 connected to the peripheral walls of the girders are welding ribs having the same height as the peripheral walls so that welding is possible. Further, at the intersecting portions of the reinforcing ribs 45, 46, 47, and 48 in the inside of the girder, welding ribs having the same height as the peripheral wall of the girder are formed.

  Further, the reinforcing portion H is constituted by a thick portion 53 in which the thickness of the top plate is increased. In the present invention, in order to reduce the deformation amount of the deck board, the reinforcing rib 50 and the reinforcing rib 51 having a narrow interval are provided inside the girder, and the top plate is formed thick in the range of the reinforcing portion H. The reinforcing portion H is formed by providing the thick portion 53.

  That is, the thickness of the top plate in the range surrounded by the reinforcing ribs 45a, 46a, 47a and 48a closest to the fork insertion port 26 side opened in the longitudinal direction (front direction) X and the peripheral wall of the girder The thickness portion 53 is thicker than the thickness of the portion. Coupled with the configuration of the reinforcing rib, the connection between the beam and the deck board can be made robust and the deformation of the deck board can be reduced.

  As shown in FIG. 4, the thickness T of the thick portion 53 is preferably 1.3 to 2 times (4.5 to 6.0 mm) the thickness t of the top plate. In this way, by making the constant range on the fork insertion port side of the deck board inside the girder as the thick wall portion 53, the deformation of the deck board can be prevented and the right angle with the girder can be maintained. If the deformation of the deck board is prevented, the deformation of the girder is also prevented, so that the deformation amount can be kept small as a whole.

  The thick portion 53 is formed in a certain range on the top plate inside the hollow girder. Of the connecting portions with the girder, other portions in the certain range are also present on the top plate facing the fork insertion port. You may form the thick part made thicker. In this case, the deformation of the deck board can be further reduced.

  Moreover, in the said embodiment, the thick part which comprises the reinforcement part H has the reinforcement rib 45a, 46a, 47a and 48a nearest to the fork insertion port 26 side opened in a longitudinal direction (frontage direction) X, and the surrounding wall of a girder However, the present invention is not limited to this, and is not limited to this. In the girder facing the orthogonal insertion side, that is, the fork insertion port side opened in the short direction (depth direction) Y. It is good also as a structure formed also in a top plate.

It is a front view which shows a part of pallet. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 1 and is a bottom view on the upper deck board side showing a size of a quarter. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG. It is explanatory drawing which shows the mounting state of the pallet in an automatic warehouse.

Explanation of symbols

20: Pallet 21: Upper deck board
22: Lower deck board 23: Girder at four corners
24: Intermediate digit
25: Center digit
26: fork insertion port 30: openings 31, 32, 33, 34, 35: reinforcing ribs 36, 37, 38, 39: reinforcing ribs 40, 41, 42: oblique reinforcing ribs 50, 51: reinforcing ribs
53: Thick part

Claims (4)

  A synthetic resin pallet that connects the upper deck board and the lower deck board with the four corner girders, the middle girders, and the middle girders, and the fork insertion hole that is surrounded by the girders and the upper and lower deck boards. A grid-like rib that crosses vertically and horizontally on the lower side of the top plate of the inner part surrounded by the corners of the four corners, the middle part of the girder, and the corner part of the central part, and either of the lattice-like ribs A synthetic resin pallet characterized in that diagonal reinforcing ribs are provided between the peripheral walls of each girder.   Among crossed grid-like ribs provided in the inner part surrounded by the four corner girders, the middle girders, and the middle girders, the one or more ribs near the girders and the peripheral walls of the girders 2. The synthetic resin pallet according to claim 1, wherein diagonal reinforcing ribs are provided therebetween.   The cross-sectional area of one or more ribs close to each other among the crossed lattice ribs provided in the inner part surrounded by the four corner girders, the middle girders, and the corners of the central girders The synthetic resin pallet according to claim 1 or 2, wherein the pallet is made larger than a cross-sectional area.   On the underside of the top plate in the four corner girders, the middle girders, and the middle girders, reinforcing ribs that are parallel and orthogonal to the side surface of the deck board are provided, and the longitudinal direction of the orthogonal reinforcing ribs The reinforcement rib closest to the fork insertion opening side in the (frontage direction) and a range surrounded by the peripheral wall of the girder are formed as a reinforcement portion, and the plurality of reinforcement ribs provided in the longitudinal direction (frontage direction) The synthetic resin pallet according to any one of claims 1 to 3, characterized in that the deck board is formed by a thick portion in which the thickness of the deck board is thicker than the thickness of other portions of the deck board.

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