JP3149344B2 - Plastic pallets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pallet for carrying cargo, and more particularly to a guard for preventing a load loaded on a flat pallet from dropping and for enabling stacking. The present invention relates to a large-sized synthetic resin pallet that can be freely attached.

[0002]

2. Description of the Related Art Pallets are indispensable for today's integrated transportation and are widely used in production sites and logistics. As a pallet of the type that guards to prevent the transported goods loaded on the pallet from falling, a so-called box pallet with a wall-shaped guard that surrounds the transported object on the periphery of the pallet, 2. Description of the Related Art A pallet with a guard to which a side guard made of a column or the like for preventing a transported object from dropping is mounted is known.

FIG. 1 shows an example of a guarded pallet.
0, a guard member 2 is attached to a wooden pallet body 1. The wooden pallet main body 1 connects the upper deck board 3 and the lower deck board 4 with both end girders 5, central girders 6 and middle girders 7, 8.
And the center spar 6 and the middle spar 7, 8 are provided in parallel with each other, and both ends of the middle spar 7, 8 protrude horizontally from the upper deck board 3 and the lower deck board 4 horizontally. . The space between the middle girders 7 and 8 is a fork insertion hole 14. The guard member 2 comprises a support 9 formed of a round pipe material and a stay 10 connected at the upper end of the support 9. The support 9 has a lower end fixed to a metal fitting 11 fixed to the protrusions of the intermediate girders 7, 8. It is attached by detachably fitting. The stay 10
Is constructed by providing a U-shaped connecting portion 13 at both ends of a rod portion 12 and fitting a distal end portion of the connecting portion 13 to an upper end of the column 9.

The guarded pallet having the above structure has a length in the short direction of 1100 to 1200 mm and a length in the long direction of 1800 to 2000 mm. Conventionally, as such a large pallet, a wooden pallet is widely used. I have.
However, although wooden pallets are lightweight, inexpensive, and excellent in strength, they are not only troublesome to maintain, but also reviewed from the viewpoint of resource saving. Therefore,
Although it is possible to manufacture with a synthetic resin like a normal small transport pallet, there are the following problems when manufacturing with a synthetic resin.

[0005]

That is, since it is difficult to integrally mold such a large pallet, a manufacturing method in which a plurality of parts are divided and molded in advance and then integrally welded is generally adopted. Can be However, there is a problem that the strength of the welded portion is lower than that of other integrally formed portions. As a dividing method, a method of dividing the plane in parallel in the same direction and a method of dividing the plane in a direction orthogonal to the same direction can be considered. There is a problem when passing through the center. That is, as shown in FIG. 11, when a load W from above is applied to the welded portion A, a tensile stress is generated in the lower portion B, which causes breakage or peeling of the welded surface. As a countermeasure for these, there are methods such as increasing the thickness of the vertical ribs and / or the horizontal ribs on the welding surface or increasing the number thereof.
Not only does this increase the weight of the product, and thus increase the cost of the product, but it is not always a sufficient preventive measure for a large synthetic resin pallet, and there is a possibility that breakage cannot be prevented. In view of the above, the present invention provides a structure having a sufficient strength at a welded portion even in a large synthetic resin pallet obtained by welding parts formed by division.

[0006]

The present invention has the following configuration to achieve the above object. That is, the synthetic resin pallet according to claim 1 is a synthetic resin pallet in which an upper deck board and a lower deck board are connected at a spar, and a fork insertion hole is provided between the spar and the spar. A welded part reinforcing plate that is divided into a plurality of parts by a dividing line parallel to the dividing line, and is adjacent to the dividing surface at the dividing line and parallel to the dividing surface;
The reinforcing ribs connecting the provided, the weld reinforcement plate connecting the top deck boards and bottom deck board when assembled together by welding, the upper and lower deck board and the welding portion reinforcing
A plurality of hollow sub-chambers are formed by the plate and the reinforcing ribs , and a column fitting hole is provided in a girder portion, and the column fitting hole is formed by an upper component cylindrical body and a lower part opening to an upper deck board. It is formed by abutting a lower part cylinder reaching the deck board, and a drain hole is provided in a lower deck board in the lower part cylinder. The synthetic resin pallet according to claim 2 is divided into two parts by a dividing line passing through the center in the plane and parallel to the side surface, and is further divided into upper parts and lower parts to form a total of 4 parts. It is characterized in that it is divided into individual parts and a tapered surface is formed at the tip of the lower part cylindrical body on the welding surface side.

The pallet made of synthetic resin according to the third aspect is divided into four parts by a cross-shaped parting line which passes through substantially the center in a plane and is parallel to the side surface, and further forms these parts into an upper part and a lower part. divided molded parts divided molded into a total of eight parts, the cross-shaped dividing line dividing plane parallel to the welding reinforcement plate in proximity to the thus divided division surface on at least one of the dividing lines of the And a tapered surface is formed at the tip of the lower component cylinder on the welding surface side. The synthetic resin pallet according to claim 4 ,
The dividing surface on which the welding portion reinforcing plate is provided is in the same direction as the fork insertion direction, and the dimension between the dividing surface and the welding portion reinforcing plate is 5 mm.
mm to 50 mm. The synthetic resin pallet according to claim 5 is characterized in that auxiliary ribs for welding, which are perpendicular to the division surface and have a height lower than the welded portion reinforcing plate, are provided in the small compartment. The pallet made of synthetic resin according to claim 6 is characterized in that the small compartment is sealed.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of a synthetic resin pallet according to the present invention, and FIG. 2 is a front view of the same. The synthetic resin pallet 17 is in the short direction (depth direction)
A large pallet having a dimension of X of 1160 mm and a dimension of Y in the longitudinal direction (frontage direction) of 2000 mm is provided.
They are connected by a center part girder 21 and an intermediate part girder 22. The both ends girder 20, center girder 21 and middle girder 22
Is a two-sided pallet provided in parallel with the side surface in the transverse direction X and having a fork insertion hole 24 between the center girder 21 and the middle girder 22. Between the both-end girder 20 and the middle girder 22 is a column storage hole 25 for a column serving as a guide member, and like the fork insertion hole 24, is opened on the opposite side.

The synthetic resin pallet 17 has:
A plurality of column fitting holes 26 are provided on the upper surface of the upper deck board 18 and open to the lower deck board 19. In the embodiment shown in the drawing, fourteen 16 pillar fitting holes 26 are provided at equal intervals in the transverse direction X and the longitudinal direction Y, respectively. A column serving as a guide member is detachably provided upright or detachably in all or a part of the column fitting hole 26. Further, on the upper surface of the synthetic resin pallet 17, a band-shaped non-slip member 27 is provided.
Are attached in parallel.

The pallet 17 made of synthetic resin is formed by welding a plurality of parts which have been divided and formed in advance and integrally assembling them.
That is, as shown in FIG. 1, the two parts 32 are divided by a dividing line 29 that passes through a substantially central portion of the plane and is parallel to the side surface.
33, these parts are further divided into upper parts 32a, 33a and lower parts 32b, 33b by a horizontal dividing line 31 at the spar, respectively, as shown in FIG. Perform split molding. The upper parts 32a, 33
As shown in FIGS. 4 to 6, the inner surfaces of the lower part 32a and the lower parts 32b and 33b are reinforced by reinforcing ribs 37 having the same height as the spar and reinforcing ribs 38 lower than the spar. The reinforcing ribs 37 and 38 are provided parallel to the side surface, but may be provided obliquely to the side surface.

Further, one of the features of the present invention resides in that a welded portion reinforcing plate 40 is provided in parallel with the dividing surface 39 in the vicinity of the dividing surface 39 divided by the dividing line 29. When the welded portion reinforcing plate 40 is integrally assembled by welding, the welded portion reinforcement plate 40 has the same height as the spar, connects the upper deck board 18 and the lower deck board 19, and is provided in parallel on both sides of the dividing line 29. . As is apparent from FIG. 6, the welding portion reinforcing plate 40 is provided with a reinforcing rib 41 and an auxiliary rib 42 which are orthogonal to the division surface and connected to each other. The reinforcing ribs 41 have the same height as the welded portion reinforcing plate 40, but the auxiliary ribs 42 have a lower height and the reinforcing ribs 38 have a lower height.
If it is formed at substantially the same height as, the reinforcing ribs 41 assist
The interval between the ribs 42 is half the interval between the reinforcing ribs 37 and 38 running in parallel outside the welding portion reinforcing plate 40.

The welded portion reinforcing plate 40 is provided close to the welded surface to prevent concentration of a load on the welded surface, and the dimension between the divided surface 39 and the welded portion reinforcing plate 40 is 5 mm to 5 mm. Desirably, it is 50 mm. Since the welding portion reinforcing plate 40 is provided in parallel on both sides of the dividing line,
When integrally assembled by welding, a plurality of hollow small compartments are formed by the upper and lower deck boards and the reinforcing ribs 41. Preferably, the small compartment is sealed. Even if a load is applied, such a closed hollow small compartment holds the upper deck board 18 and the lower deck board 19 substantially parallel between the welded portion reinforcing plates 40 and concentrates the load on the welded surface. Can be prevented and the bending strength can be improved. That is, as shown in FIG. 3, since the welding portion reinforcing plate 40 connects the upper deck board 18 and the lower deck board 19 on both sides of the welding portion, the concentration of the load on the welding portion is prevented.

Next, the column fitting hole 26 will be described with reference to FIGS. The column fitting hole 26 is for erecting a column serving as a guide member, and opens to the upper deck board 18 and reaches the lower deck board 19. That is, as shown in FIG. 7 and FIG.
The upper part cylinder 4 provided on the inner surface of the upper deck board 18
5 and lower part cylinder 4 provided on the inner surface of lower deck board 19
6. The upper component cylinder 45 is open to the upper deck board 18, but the distal end of the lower component cylinder 46 has a tapered surface 48 that gradually widens toward the welding surface, and the lower deck board 19 has water. A hole 49 is formed. Therefore, the width of the welding surface of the lower part cylinder 46 is formed to be small by the tapered surface 48. Therefore, when the lower part cylinder 46 is abutted against the upper part cylinder 45, an annular concave portion 50 having a triangular cross section is formed as shown in FIG. The annular recess 50 can be used as a bead. The bead at the time of welding is retained in the annular recess 50 by the annular recess 50, thereby preventing swelling into the cylinder and facilitating the fitting of the support.

Further, the height H1 of the upper part cylinder 45 is slightly lower than the height H2 of the girders of the upper part and the reinforcing ribs 37, and the height H3 of the lower part cylinder 46 is the girder of the lower part. And the height is slightly lower than the height H4 of the reinforcing rib 37. Therefore, the welding margin of the upper component cylinder 45 and the lower component cylinder 46 is smaller than the welding margin of the girders and the reinforcing ribs 37, and the occurrence of beads can be reduced accordingly. As described above, the support fitting hole 26 is formed between the upper part cylinder 45 and the lower part cylinder 4.
6, the height dimension is smaller than the girder dimension of each part, and at the tip of the lower part cylindrical body 46, a tapered surface 48 gradually expanding toward the welding surface is formed. And the swelling of the bead into the hole 26 can be prevented.
The cross-sectional shape of the cylindrical body is not limited to a circle, but may be an arbitrary shape such as a polygon such as a triangle and a quadrangle, an ellipse, and a rectangle.

Further, the support post fitting hole 26 is provided in the center girder 2.
1 and the inside of the intermediate part girder 22, and a reinforcing projection 51 is provided on the side surface. The column fitting holes 26 may be provided in the both ends girder 20. In addition, the position and the number of the pillar fitting holes 26 are not limited to the embodiment, and can be appropriately determined according to the type and size of the transported object. Further, the above-mentioned support column storage hole 25 is effective for storing unnecessary columns, but can be omitted. When omitting the support storage hole 25, use the both ends girder 2
0 may be connected to the intermediate part 22 to form one digit,
Only the both side surfaces of the support hole 25 may be closed.

In the above-described embodiment, the dividing method on the plane is divided by the dividing line parallel to the side surface.
The dividing line parallel to the side surface may be parallel not only to one side surface but also to the other side surface. In this case, the dividing line is a cross-shaped dividing line that intersects substantially at the center. Further, the number of division lines is not limited. Although the two-sided pallet has been described, it is needless to say that the present invention can be applied to a four-sided pallet.

[0017]

As described above, the present invention has the following advantages. That is, in the synthetic resin pallet according to the first aspect, since the welding portion reinforcing plate is provided near the dividing surface and parallel to the dividing surface, deformation of the welding portion when a load is applied is prevented, and breakage or peeling is prevented. No durable pallets can be obtained. Further, since a plurality of hollow small compartments are formed by the welding portion reinforcing plate and the plurality of reinforcing ribs orthogonal to the welding portion reinforcing plate, the welding portion can be made more robust. Further, since the column fitting hole is provided, the column serving as the guide member can be erected.
Further, in the synthetic resin pallet according to the second aspect, it is possible to reduce the size of the component and to increase the strength of the welded portion. Further, in the synthetic resin pallet according to the third aspect, while it is possible to further reduce the size of parts, it is possible to manufacture a larger pallet. Further
In claims 2 and 3, the bead pool
By forming the annular recess, the bead cylinder during welding
Prevents bulging into the inside and facilitates insertion of the strut.

Further, in the synthetic resin pallet according to the fourth aspect, since the welding portion reinforcing plate is formed on the division surface in the same direction as the fork insertion direction, the welding portion in the direction that is easily distorted is reinforced. Further, in the synthetic resin pallet according to the fifth aspect, the strength of the welded portion is increased by the auxiliary ribs orthogonal to the division surface. In the pallet made of synthetic resin according to the sixth aspect, deformation is prevented by the closed small compartment, and the strength is further increased.

[Brief description of the drawings]

FIG. 1 is a plan view of a synthetic resin pallet.

FIG. 2 is a front view of the same.

FIG. 3 is an explanatory front view showing a deformation state when a load is applied by a dashed line.

FIG. 4 is a sectional view showing a half inner surface of the upper part.

FIG. 5 is a sectional view showing an inner surface of a half of a lower part.

FIG. 6 is a perspective view of a main part showing a welding surface of a lower part.

FIG. 7 is a sectional view of a main part showing an upper part tubular body.

FIG. 8 is a cross-sectional view of a main part showing a lower component cylinder.

FIG. 9 is a cross-sectional view of a main part showing a pillar fitting hole formed by welding an upper component cylinder and a lower component cylinder.

FIG. 10 is an explanatory perspective view showing an example of a conventional wooden pallet with a guard.

FIG. 11 is an explanatory front view showing a deformed state of a welding portion of a conventional synthetic resin pallet.

[Explanation of symbols]

 Reference Signs List 17 Pallet made of synthetic resin 18 Upper deck board 19 Lower deck board 20 Both ends girder 21 Center girder 22 Middle girder 24 Fork insertion hole 25 Prop storage hole 26 Prop fitting hole 27 Non-slip member 29 Dividing line 32 to 33 Parts 32a -33a Upper part 32b-33b Lower part 37 Reinforcement rib 38 Reinforcement rib 39 Dividing surface 40 Welding part reinforcement plate 41 Reinforcement rib 42Auxiliary rib  45 Upper component cylinder 46 Lower component cylinder 48 Tapered surface 49 Drainage hole 50 Annular recess 51 Projection

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-124556 (JP, A) JP-A-61-115837 (JP, A) JP-A-58-29927 (JP, U)

Claims (6)

(57) [Claims] 1. A synthetic resin pallet in which an upper deck board and a lower deck board are connected at a spar and a spar is provided between the spar and a fork insertion hole. A welded part reinforcing plate which is divided into parts and is parallel to the dividing plane in the vicinity of the dividing plane at the dividing line;
A strong rib is provided, and the welded portion reinforcing plate connects the upper deck board and the lower deck board when integrally assembled by welding, and a plurality of hollows are provided by the upper and lower deck boards, the welded portion reinforcing plate, and the reinforcing rib. And a strut fitting hole is provided in the girder portion, and the strut fitting hole has an upper component cylinder opening to the upper deck board and a lower component cylinder reaching the lower deck board. The lower deck board inside the lower component cylinder has a drain hole.
A pallet made of synthetic resin, which is characterized by being radiated. 2. A two-part part is formed by dividing a part of the plane by a dividing line passing substantially at the center and parallel to the side surface. 2. The synthetic resin pallet according to claim 1, wherein a tapered surface is formed at a tip end of the lower component cylindrical body on a welding surface side. 3. A part formed by dividing into four parts by a cross-shaped parting line which passes through a substantially center in a plane and is parallel to a side surface,
Further dividing surfaces close to them divided molded into the top and bottom portions divided molded into a total of eight parts, divided surfaces thus divided into at least one of the dividing line of the cross-shaped dividing line And a welded part reinforcement plate parallel to
2. The synthetic resin pallet according to claim 1, wherein a tapered surface is formed at a tip portion on the welding surface side of the lower component cylinder. 4. The split surface on which the welding portion reinforcing plate is provided is in the same direction as the fork insertion direction, and the dimension between the split surface and the welding portion reinforcing plate is 5 mm to 50 mm. The pallet made of synthetic resin according to any one of claims 1 to 3. 5. The welding rib according to claim 1, wherein an auxiliary rib perpendicular to the dividing surface and lower than the welding portion reinforcing plate is provided in the small compartment. The synthetic resin pallet as described. 6. The synthetic resin pallet according to claim 1, wherein the small compartment is sealed.