JP2005104562A - Synthetic resin pallet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin pallet in which the strength of the weld parts, which are easily damaged by the impact of the forks of a fork lift, is improved and the weight is reduced. <P>SOLUTION: The synthetic resin pallet is formed by welding together molded upper and lower parts into which the pallet is divided along the middle of a post section. In the synthetic resin pallet, horizontal weld ribs connecting to the peripheral wall of the support section are provided on the butting side of the weld ribs in the support section, and the weld ribs are butt-welded, thereby integrally constructing the pallet. The horizontal weld ribs connect to the peripheral wall of the post section at least on the side facing a fork insertion holes. It is preferable that the top of the horizontal weld ribs is open. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a synthetic resin pallet for forklifts used for storage and transportation of luggage, and particularly to a synthetic resin pallet that is light in weight and excellent in impact resistance against forks of a forklift.

  Synthetic resin pallets for storing and transporting luggage are excellent in corrosion resistance and contamination resistance and have been widely used. The conventional synthetic resin pallet is connected to the upper and lower deck boards by connecting the flat square upper deck board and lower deck board with the support columns of the hollow structure arranged at both ends and the middle part. The space is a fork insertion hole into which the fork of the forklift is inserted.

  And in order to manufacture such a pallet, after separately molding the upper part and the lower part in a state of being divided horizontally in the middle part of the support part, the end surfaces of the support parts of the upper part and the lower part are brought into contact with each other. There is a method of integrally molding by welding. Since such a pallet is transported by a forklift, the deck board and the column are not only subjected to a high load when a load is placed, but also subjected to a fork contact and an impact during a cargo handling operation by the forklift.

In particular, there is a problem that the welded portion is easily damaged by the impact of the fork. In order to reinforce the impact of the fork, the thickness of the portion that receives the impact is increased or a reinforcing rib is provided. For example, a pallet described in Japanese Utility Model Publication No. 52125483 is used to increase the weld strength by increasing the wall thickness, and a pallet described in Japanese Utility Model Publication No. 60-28577 is provided for a structure provided with reinforcing ribs to increase the weld strength. There is.
Japanese Utility Model Publication No. 53-135483 Japanese Utility Model Publication No. 60-28577

  By the way, both the structure in which the thickness of the welded portion is increased and the structure in which the reinforcing rib is provided increase the welded area and improve the weld strength, but requires more material. In addition, in the structure in which the thickness is increased, there is a problem that the mass increases and the molding cycle becomes longer and the production efficiency is deteriorated. Further, the structure in which the reinforcing rib is provided has a problem that the mass increases and a light pallet that is easy to handle cannot be obtained.

  Accordingly, an object of the present invention is to provide a synthetic resin pallet capable of reducing the weight while improving the strength of the welded portion of the forklift that is easily damaged by the impact of the fork.

  The synthetic resin pallet according to the present invention is a synthetic resin pallet formed by welding an upper part and a lower part which are divided and molded at an intermediate part of a support part, and a support part on a butt side of a welding rib inside the support part. A horizontal welding rib connected to the peripheral wall is provided, and the welding rib is abutted and welded so as to be integrally formed.

  In the synthetic resin pallet according to the present invention, the horizontal welding rib is preferably connected to the peripheral wall on the side of the column portion facing at least the fork insertion hole, and the horizontal welding rib is preferably opened above. Further, in the intermediate strut portion, it is preferable to provide a horizontal welding rib on the side where the welding rib is parallel to the end surface of the column portion because it has sufficient strength against an impact on the end surface.

  According to the synthetic resin pallet according to the present invention, the welding area is increased by the horizontal welding rib, whereby the welding strength is improved. Therefore, at the edge portion on the fork insertion side, a structure having excellent impact resistance can be obtained without deformation or damage even if the fork collides in parallel with the insertion direction or collides from an oblique direction. . Further, since the horizontal welding rib is provided in a portion that is susceptible to impact of the fork, an increase in mass can be suppressed to a minimum, and the weight of the pallet can be reduced.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a synthetic resin pallet according to the present invention will be described with reference to the drawings. In the drawings to be referred to, FIG. 1 is a plan view of a two-way pallet showing a half of a synthetic resin pallet according to one embodiment, FIG. 2 is a bottom view of an upper part having a quarter size, and FIG. FIG. 4 is a top perspective view showing the main part of the upper part, and FIG. 4 is a bottom perspective view of the upper part.

  The two-way-type pallet 1 is provided with support columns 5 on both side ends of an upper deck board 3 and a lower deck board (not shown), and an intermediate support column 7 between them, and is surrounded by the support columns and the upper and lower deck boards. The space is a fork insertion hole 9. The pallet 1 includes an upper part 10 having an upper deck board 3 and a lower part (not shown) having a lower deck board, which are divided in advance in a horizontal direction at a substantially central portion of each column part. Each of the support portions has a hollow structure.

  The pallet 1 of the embodiment shown in FIG. 1 is composed of an upper deck board 3 and a lower deck board having substantially the same structure, and is a double-sided pallet that can be used even when turned over. Therefore, in the following description, the configuration of the upper part 10 will be described, and the description of the configuration of the lower part will be omitted.

  As shown in FIGS. 1 and 2, the upper deck board 3 includes a horizontal beam 21 perpendicular to the fork insertion direction, vertical beams 23 and 25 parallel to the fork insertion direction, and a fork. It is comprised by the top plates 27 and 29 which close an upper surface in the edge part by the side of the insertion hole 9. FIG. The horizontal bars 21 and the vertical bars 23 and 25 form a deck board with a grid-like bar. The horizontal crosspiece 21 is a plate-like horizontal crosspiece. The vertical beam 23 is a plate-shaped horizontal beam that is formed inside the column parts 5 and 7 and is the same as the horizontal beam 21. The vertical beam 25 is a vertical beam at a portion facing the fork insertion hole 9 and is a vertical beam having a certain height.

  Further, as shown in FIG. 2, reinforcing ribs 21 a and 21 b are provided on the lower surface of the horizontal rail 21. The reinforcing rib 21 a is provided on the lower surface of the horizontal beam 21 at the portion facing the fork insertion hole 9, and is formed at the same height as the vertical beam 25. On the other hand, the reinforcing rib 21b is provided on the lower surface of the horizontal beam 21 in the both-end column part 5 and the intermediate column part 7, and is formed lower than the height of the reinforcing rib 21a and the vertical beam 23. Further, the reinforcing ribs 21b in the both-end supporting column part 5 and the intermediate supporting column part 7 are formed at the same height as the peripheral walls 5a and 7a of the supporting column part at regular intervals, and are butt-welded.

  Next, the structure of the support | pillar parts 5 and 7 is demonstrated. As shown in FIGS. 2 and 4, the peripheral walls 5 a and 7 a of the support columns 5 and 7 have a closed hollow structure, and the corners facing the fork insertion holes 9 are formed into circular or curved surfaces. The arc corners 5b and 7b are provided. Reinforcing ribs 30 and 32 are provided inside the support columns 5 and 7. The reinforcing rib 30 is provided on the lower surface of the vertical rail 23 in the both-end support column 5 in parallel with the fork insertion direction, and is formed at the same height as the peripheral wall 5a. In addition, the reinforcing rib 32 is provided on the lower surface of the vertical rail 23 in the middle strut portion 7 in parallel with the fork insertion direction, and is formed at the same height as the peripheral wall 7a.

  Furthermore, inside the both-ends column part 5 is provided with an edge reinforcing rib 34 parallel to the reinforcing rib 30 between the horizontal rail 21 and the peripheral wall 5a at the edge on the fork insertion side, An oblique reinforcing rib 36 is provided toward the arcuate corner 5b facing the fork insertion hole of the support column 5. The edge reinforcing rib 34 on the arcuate corner 5b side extends from the edge to the second horizontal rail 21.

  On the other hand, the intermediate strut portion 7 is provided with an edge reinforcing rib 38 parallel to the reinforcing rib 32 between the horizontal rail 21 and the peripheral wall 7a at the edge on the fork insertion side, An oblique reinforcing rib 40 is provided toward the arcuate corner portion 7b facing the fork insertion hole of the support column portion 7. The reinforcing rib 38 connected to the diagonal reinforcing rib 40 extends from the end edge to the second horizontal rail 21.

  As is apparent from FIGS. 1 and 2, the upper surface of the edge portion facing the fork insertion hole is closed by a top plate 27. The top plate 27 is provided between the second horizontal rails 21 from the end edge, but is not limited thereto. On the other hand, the top plate 29 is provided at the end edge portion on the fork insertion side of the both-end column portion 5 and the intermediate column portion 7 and closes the upper surface.

  Next, the structure of the welding surface, which is a feature of the present invention, will be described. A feature of the present invention is that horizontal welding ribs 41 and 43 are provided at the edge portions of the both-end supporting column part 5 and the intermediate supporting column part 7 on the fork insertion side. The horizontal welding rib 41 in the both end support | pillar part 5 is provided between the reinforcement rib 30 and the surrounding wall 5a, and the edge part is connected with the surrounding wall 5a. In the illustrated embodiment, the welding rib 41 has a height of the second reinforcing rib 21b from the end edge on the fork insertion side as the welding rib 21c having the same height as the peripheral wall 5a, and a lower end of the welding rib 21c. It is provided at a right angle. The upper part of the welding rib 41 is open.

  Further, the horizontal welding ribs 43 in the intermediate strut portion 7 are provided at the arcuate corner portion 7b and its intermediate portion in order to increase the welding strength against the impact of the fork. The welding rib 43a is provided between the reinforcing rib 38 and the peripheral wall 7a, and the end is connected to the peripheral wall 7a. The welding rib 43a is formed so that the height of the second reinforcing rib 21b from the end edge is the welding rib 21d having the same height as the peripheral wall 7a, and is provided at a right angle at the lower end of the welding rib 21d. The upper part of the welding rib 43a is opened.

  The horizontal welding rib 43b in the intermediate strut 7 is a welding rib 21e having the same height as the peripheral wall 7a between the reinforcing ribs 38 to which the diagonal reinforcing ribs 40 connect the height of the first reinforcing rib 21 from the end edge. And at the lower end of the welding rib 21e in a perpendicular direction. The upper part of the welding rib 43b is open. Moreover, the horizontal welding rib 43c is provided in the reinforcement rib 38 which the diagonal reinforcement rib 40 connects, and is connected with the said welding rib 43b. The upper part of the welding rib 43c is opened.

  In the above embodiment, the horizontal welding rib 43 is formed by the welding rib 43a connected to the peripheral wall 7a, the welding rib 43b parallel to the end face, and the welding rib 43c orthogonal to the welding rib 43b. Omitted, the welding rib 43a and the welding rib 43b may be provided linearly. Further, what number of horizontal rails from the edge should be determined as appropriate.

  As described above, in the synthetic resin pallet according to the present invention, the reinforcing ribs 34 having the same height as the peripheral walls 5a and 7a are provided at the end edge portions on the fork insertion side inside the both-end supporting column part 5 and the intermediate supporting column part 7. 38 and horizontal reinforcing ribs 41 and 43 are provided. Accordingly, not only the fork impact-sensitive part is reinforced by the reinforcing ribs, but also the horizontal welding ribs are provided to increase the welding area, so the impact strength can be increased without increasing the wall thickness. .

  Moreover, as shown in FIG. 5, it is preferable to reinforce the welding ribs 21e and the horizontal welding ribs 43 by providing connecting ribs 45 at appropriate intervals. Thus, when the connection rib 45 is provided, the crimping force at the time of welding becomes uniform, and a high strength welding force is obtained.

  In addition, although the said embodiment demonstrated the horizontal welding rib of the upper part, it forms similarly about a lower part. In order to avoid duplication, description of the lower part is omitted. Moreover, although the two-sided type double-sided use pallet has been described in the above embodiment, a four-way type pallet may be used.

It is a top view which shows the half of the synthetic resin pallets which concern on one Embodiment of this invention. It is the bottom view of the upper part which divided horizontally in the middle of a support | pillar part, and expanded a part of four corners. It is an expansion perspective view which shows the principal part of an upper part. It is a lower surface perspective view which similarly shows the principal part of an upper component. It is an explanatory perspective view which shows the butt | matching state before welding of a horizontal welding rib.

Explanation of symbols

1: Two-way pallet 3: Upper deck board 5: Both-end support portions 5a, 7a: Peripheral walls 5b, 7b: Arc corner 7: Intermediate support portion 9: Fork insertion hole 10: Upper part 21: Horizontal beam 23, 25: Vertical beam 21a, 21b: Reinforcement rib 21c: Welding rib 23a: Vertical beam 23b in the column part: Vertical beam 27 at the fork insertion portion 27: Top plate 29: Top plate 30, 32: Reinforcement rib 34 : Edge reinforcing rib 36: oblique reinforcing rib 38: edge reinforcing rib 40: oblique reinforcing rib 41, 43: horizontal welding rib 45: connecting rib

Claims (3)

  In the synthetic resin pallet formed by welding the upper part and the lower part that are divided and molded at the middle part of the column part, a horizontal welding rib that is connected to the peripheral wall of the column part is provided on the side where the welding rib in the column part is abutted. A synthetic resin pallet characterized by being formed integrally by butt welding the welding ribs.   2. The synthetic resin according to claim 1, wherein the horizontal welding rib is connected to a peripheral wall at least on the side facing the fork insertion hole of the support column, and an opening is provided above the horizontal welding rib. Made pallet.   3. The synthetic resin pallet according to claim 1, wherein a horizontal welding rib is provided in the intermediate supporting column portion on a side where the welding rib is parallel to the end surface of the supporting column portion. 4.

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