JPH09142472A - Pallet made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent flashes, that are formed when middle legs of pallet components are thermowelded together, from protruding in the fork inserting direction, and cut down production costs while the thermoweleing area is kept wide enough. SOLUTION: Middle legs 4 protrude from the middle of the back of four sides of a rectangular loading plate 2 and are each made up of two components having different lengths in the direction of the side of a pallet. The first leg component 4A that is long in the direction of the side is located at the mouth of a fork inserting port 6 and the second leg component 4B that is short in the direction of the side is located at the inner part of the fork inserting port 6. Inward recessed parts 8 are formed at the protruding ends of the first leg component 4A on the sides facing the fork inserting holes 6. Flashes are formed when pallet components 1 are thermowelded together, and the flashes formed on the fork inserting port 6 sides of the first leg component 4A are located in the recessed parts 8 to prevent the flashes from protruding beyond the outer face of the first leg component 4A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectangular load-carrying portion, a bottomed cylindrical square leg portion projecting from the back surface of a square of the load-carrying portion and having an opening at its projecting end, and the load-carrying portion. A pallet assembly having a bottomed cylindrical intermediate leg portion projecting from the back surface at the center of the four sides and opening at the projecting end is integrally molded with a synthetic resin, and two fork insertion ports are provided on the four sides by two of these pallet components. To form a pallet having the above-mentioned structure, the projecting ends of the square leg portions and the projecting ends of the intermediate leg portions are connected by heat welding, and a fork is provided between the intermediate leg portion and the square leg portions located on both sides thereof. The present invention relates to a synthetic resin pallet formed with an insertion port.

[0002]

2. Description of the Related Art When the projecting ends of the square leg portion and the intermediate leg portion are connected by heat welding in this way, burrs are generated at the heat welding points, and the burrs project to the side facing the fork insertion port. If left, there is a risk that the pallet will be disturbed by being caught by the burr when the fork is inserted. In order to solve such a problem, the conventional method has been used.
A synthetic resin pallet disclosed in No. 32020 is known. In the pallet disclosed in this publication, an inward recess is formed at the protruding end of the corner leg and the intermediate leg that faces the fork insertion port, and burrs generated by heat welding are formed in the recess. It is intended to be left in the entrance. However, in this conventional pallet, the configuration of the intermediate leg portion is the same as that of the conventional one except for the recessed portion. Specifically, one of the two types of intermediate leg portions is a surface for the fork insertion port. There is another problem as described below because the length on the side of the fork is extremely short and the length on the other side facing the fork insertion port is too long.

[0003]

That is, the square leg and the intermediate leg are important for connecting the two pallet constructs by heat welding, and for connecting the pallet constructs as firmly as possible. It is necessary to widen the heat-welding area, and in addition, in the intermediate legs located at the center of the four sides of the loading section, the intermediate legs themselves are required to have high strength, so this intermediate legs can be used to some extent. The current situation is that it must be increased. By the way, when forming the above-mentioned recessed portion in the intermediate leg portion, a method of integrally forming at the time of forming the pallet structure or a method of forming by machining after forming can be considered, but since the intermediate leg portion itself is large, As a matter of course, the side facing the fork insertion port also becomes long, the shape of the molding die becomes complicated when molding the recessed portion, and when forming after molding,
Another problem has arisen in the production of pallets, such as increased machining work.

The present invention solves such a problem, and an object thereof is to make the heat-welding area of the intermediate leg portion as wide as possible.
Moreover, the intermediate leg portion itself can be made as strong as possible, and yet the length of the recessed portion formed at the protruding end of the intermediate leg portion can be made as short as possible to solve the manufacturing problem. To provide resin pallets.

[0005]

In order to achieve this object, according to the invention as set forth in claim 1, the intermediate leg portion projecting from the rear surface of the center of the four sides of the rectangular loading section is elongated in the side direction of the pallet. It is composed of two leg parts with different lengths, the first leg part long in the side direction is on the inlet side of the fork slot, and the second leg part short in the side direction is on the side of the fork slot. Since it is located on the back side, when inserting the fork into the fork insertion port, there is a risk that the fork may come into contact with the first leg portion which is located on the inlet side of the fork insertion port and is long in the lateral direction. Even if only the side surface of the body is used and the second leg structure is made large and strong, there is almost no risk of the fork coming into contact with the side surface of the second leg structure. Then, of the burrs formed by heat welding the pallet components to each other, an inwardly recessed part is formed at the protruding end of the first leg component facing the fork insertion port. Since the burr formed on the side of the leg structure facing the fork insertion port is located in the recess so as not to protrude from the outer surface of the first leg structure, the second leg structure is formed. Even if the body is made large and the heat-welding area of the entire intermediate leg portion is wide, and the structure is strong, the length of the recessed portion that prevents the protrusion of the burr can be shortened. The problem can be resolved.

According to the second aspect of the present invention, the outer surface of the first leg structure on the side facing the pallet side is formed to be substantially flush with the side of the load carrying section, and the projecting end thereof. An inwardly recessed portion is formed on the inner side of the first leg portion structure, and a burr formed on the pallet side of the first leg portion structure body is positioned in the recessed portion so as not to protrude from the outer surface of the first leg portion structure body. Therefore, in addition to eliminating the inconvenience when inserting the fork, there is also no burr protruding from the first leg structure to the side of the pallet, preventing the situation where other things get caught in this burr. it can.

According to the third aspect of the invention, the widths of the first leg part constituting body and the second leg part constituting body in the direction orthogonal to the side direction of the pallet are made different, and the first leg part constituting body is made different. Since the width is short and the width of the second leg structure is long, the second leg structure may be enlarged to increase the heat-welded area of the entire intermediate leg part and strengthen it. In addition, the recessed portion that prevents the protrusion of the burr can be shortened as much as possible to reduce the manufacturing cost of the pallet.

According to the fourth aspect of the present invention, the square leg portion is formed in an L-shaped cross-section, and the L-shaped square leg portion is formed inward at the protruding end on the side facing the fork insertion port. To form a recessed portion to, the burr formed on the side of the square leg portion facing the fork insertion port is located in the recessed portion so as not to project from the outer surface of the square leg portion, Not only the intermediate leg portion but also the square leg portions located on both sides of the intermediate leg portion can be prevented from protruding the burr, and the fork work can be smoothly performed.

According to the fifth aspect of the present invention, the outer surface of the square leg portion facing the pallet side is configured to be substantially flush with the side of the load-carrying portion, and the protruding end thereof is inwardly directed. Since the burrs formed on the pallet side of this square leg are formed so as not to protrude from the outer surface of this square leg, the burrs are formed in the concave portion. Not only the burr protruding from the one-leg part structure to the side surface of the pallet but also the burr protruding from the corner leg portion to the side surface of the pallet can be prevented from catching other objects.

According to the sixth aspect of the invention, since the width of the square leg portion having an L-shaped cross section is made substantially the same as the width of the first leg structure, the square leg portion is formed. It is possible to further reduce the manufacturing cost of the pallet by shortening the recessed portion as much as possible.

According to the seventh aspect of the present invention, since the recessed portion for preventing the protrusion of the burr is formed by integral molding of synthetic resin, compared with the case where it is formed by machining after molding, The labor required for forming the recessed portion can be omitted, and the pallet manufacturing cost can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a synthetic resin pallet according to the present invention will be described with reference to the drawings. The upper half of FIG. 1 is a plan view of a pallet as a finished product, the lower half is a bottom view of a pallet structure, and FIG. 2 is a front view of a pallet as a finished product. The pallet structure 1 made of synthetic resin is connected by heat welding. The two pallet constructs 1 have exactly the same shape and size, and each of the pallet constructs 1 has a square load-carrying portion 2 configured in a bias mesh shape for carrying a load.
And three types of bottomed cylindrical leg portions 3, 4, and 5 which project from the back surface of the load carrying portion 2 and whose projecting ends are open,
It is integrally molded with synthetic resin. As shown in the lower half of FIG.
4 square leg portions 3 located in the squares, 4 intermediate leg portions 4 located in the centers of the four sides of the loading section 2, and 1 central leg located in the center of the loading section 2. By connecting the projecting ends of the legs 3, 4, 5 of the pallet structure 1 to each other by heat welding, the pallet is provided with the fork insertion ports 6 on the four sides.

The square leg portions 3 located in the squares of the loading portion 2 are
The cross-sectional shape is L-shaped, the outer surface facing the side of the pallet is flush with the side of the loading section 2, and a plurality of integrally formed reinforcing ribs 3a are disposed inside thereof. The corner leg portion 3 is reinforced. The intermediate leg 4 located at the center of each side of the loading section 2 has a rectangular first leg structure 4A having a long cross section in the side direction, and a cross section shorter than the first leg structure 4A in the side direction. The second leg structure is formed by the second leg structure 4B having a rectangular shape and shares one side of the rectangle with the first leg structure 4A on the inlet side of the fork insertion port 6. 4B is located behind the fork insertion port 6. These first and second leg structure bodies 4A and 4B are also reinforced with the reinforcing ribs similarly to the above-mentioned corner leg portion 3, and a total of three reinforcing ribs 4a are provided inside the first leg structure body 4A. Is parallel to the short side of the rectangle, and there are a total of 2 inside the second leg structure 4B.
The individual reinforcing ribs 4b are arranged obliquely.

First leg structure 4A and second leg structure 4B
Means that not only the length differs in the side direction but also the width in the direction orthogonal to the side direction is different, and the width of the first leg portion constituting body 4A is short and the width of the second leg portion constituting body 4B is long. The outer surface of the first leg portion structure 4A facing the side of the pallet is flush with the side of the load carrying portion 2 and the width of the first leg portion structure 4A is equal to the width of the first leg portion structure 4A. In addition, the width of the square leg portion 3 is also set to the same width. Also, the loading section 2
The central leg portion 5 located at the center of has a square cross section,
The length of one side thereof is configured to be the same as the length of the second leg portion constituting body 4B in the side direction, and is reinforced by a reinforcing rib 5a integrally formed in the square.

The pallet structure 1 having such a structure is integrally molded with a synthetic resin in a state where a long pipe-shaped reinforcing member 7 as shown in FIG. Although the protruding ends of the leg portions 3, 4, 5 are connected by heat welding, there is a risk that the forks may come into contact with each other when inserting the fork (not shown) into the fork insertion port 6,
A recessed portion for preventing protrusion of burrs generated by heat welding is integrally formed at a place where another object may abut.

That is, the place where the fork may come into contact is, as shown by X in the lower half of FIG. 1, a surface of the fork insertion port 6 of the first leg structure 4A of the intermediate leg 4. And the side facing the fork insertion opening 6 of the square leg portion 3, and the inward recessed portions 8 and 9 are formed at that portion as shown in (a) and (b) of FIG. 3, respectively. Has been done. The difference in the shapes of the both recessed portions 8 and 9 is due to the difference in the wall thickness between the first leg portion constituting body 4A and the square leg portion 3, and the strength is required. At the protruding end of the leg structure 4A,
As shown in (a), the recessed portion 8 having a thin tip is formed on the projecting end of the square leg portion 3 having a relatively thin wall.
Recessed portion 9 having the same thickness as that shown in FIG.
Are integrally formed when the pallet structure 1 is formed. Also, as shown by Y, the side of the first leg structure 4A located on the side of the pallet and the side of the square leg 3 located on the side of the pallet are likely to come into contact with other objects. And the first leg part 4A has (a)
The concave portion 8 shown in FIG. 2 is formed in the square leg portion 3, and the concave portion 9 shown in FIG. Therefore, at the locations where the recesses 8 and 9 are formed, the burr 10 generated by heat welding does not project outside the outer surface of the burrs 10 located inside the recesses 8 and 9.

[Other Embodiments] In the above-described embodiments, the load carrying section 2 is shown as a square, but the load carrying section 2 may be formed in a rectangular shape. Also,
Recessed portions 8 and 9 formed in the first leg structure 4A and the square leg portion 3
The shape can be changed in various ways, and in addition to forming the pallet structure 1 by integral molding, for example, the pallet structure 1 can be molded and then machined.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a plan view of a synthetic resin pallet and a bottom view of a pallet structure.

[Figure 2] Front view of a synthetic resin pallet

FIG. 3 is a sectional view showing a welded portion of a leg portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pallet structure 2 Loading part 3 Square leg 4 Intermediate leg 4A 1st leg structure 4B 2nd leg structure 6 Fork slot 8, 9 Recessed part 10 flash

Claims (7)

[Claims] 1. A rectangular load carrying part (2), a bottomed cylindrical corner leg part (3) projecting from a back surface of a square of the load carrying part (2) and having a projecting end open, and the load carrying part. A pallet constituting body (1) having a bottomed cylindrical intermediate leg portion (4) protruding from the back surface at the center of the four sides of the placing portion (2) and opening at the protruding ends is integrally molded of synthetic resin, and this pallet is formed. 2 of construct (1)
In order to form a pallet having fork insertion ports (6) on four sides by individual pieces, the protruding ends of the square leg portions (3) and the protruding ends of the intermediate leg portions (4) are connected by heat welding, A pallet made of synthetic resin, comprising a fork insertion port (6) formed between an intermediate leg portion (4) and corner leg portions (3) located on both sides of the intermediate leg portion (4). The pallet is composed of two leg parts having different lengths in the side direction, and the first leg part (4A) that is long in the side direction is short in the side direction on the inlet side of the fork insertion port (6). Insert the second leg structure (4B) into the fork slot (6)
Of the first leg structure (4
An inwardly recessed portion (8) is formed at the protruding end on the side facing the fork insertion opening (6) of (A), and the pallet structure (1) is formed.
Among the burrs (10) formed by heat-sealing each other, the burrs (10) formed on the side facing the fork insertion opening (6) of the first leg structure (4A) are the first legs. The recessed part (8) so as not to project from the outer surface of the part structure (4A).
A synthetic resin pallet located inside. 2. The outer surface of the first leg structure (4A) facing the pallet side is formed to be substantially flush with the side of the load carrying section (2), and at the protruding end thereof. An inward recess (8) is formed, and a burr (10) formed on the pallet side of the first leg structure (4A) is projected from the outer surface of the first leg structure (4A). Do not let the recessed part (8)
The synthetic resin pallet according to claim 1, which is located inside. 3. The first leg component (4A) is configured such that the width of the first leg component (4A) and the second leg component (4B) in the direction orthogonal to the side direction of the pallet are different from each other. The synthetic resin pallet according to claim 1 or 2, wherein the width of the second leg portion structure (4B) is increased, and the width of the second leg portion structure (4B) is increased. 4. The square leg portion (3) is formed in an L-shaped cross-section, and the L-shaped square leg portion (3) is internally provided at a protruding end on a side facing the fork insertion port (6). The concave portion (9) is formed on one side, and the burr (10) formed on the side of the square leg portion (3) facing the fork insertion port (6) is inserted from the outer surface of the square leg portion (3). The synthetic resin pallet according to claim 3, wherein the pallet is located in the recess (9) so as not to project. 5. The outer surface of the side of the square leg (3) facing the pallet side is substantially flush with the side of the load carrying part (2), and the projecting end is inwardly directed inward. The concave portion (9) is formed so that the burr (10) formed on the pallet side of the square leg portion (3) does not protrude from the outer surface of the square leg portion (3). The synthetic resin pallet according to claim 4, which is located inside. 6. The synthetic resin pallet according to claim 5, wherein the width of the square leg portion (3) having an L-shaped cross section is substantially the same as the width of the first leg portion constituting body (4A). 7. The recesses (8), (9) are formed by integral molding of synthetic resin.
The synthetic resin pallet according to 4, 5, or 6.