JP4130239B2 - Plastic pallet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin pallet having a fork insertion slot used when various articles are transported.
[0002]
[Prior art]
Conventionally, a vertical wall of a girder (hereinafter simply referred to as “corner girder”) or a girder arranged in the middle of the corner girder (hereinafter simply referred to as “intermediate girder”) that constitutes the fork insertion port; The corners formed by the corner girders constituting a part of the surface deck board and the lower surface of the lattice beam disposed between the intermediate girders are not formed at a right angle, but are formed into a rounded shape. There is known a synthetic resin pallet having a fork insertion port which increases the strength and facilitates the production of a mold.
[0003]
[Problems to be solved by the invention]
The following includes a mold for forming a corner formed by the vertical wall of the corner beam and the lower surface of the lattice beam disposed between the corner beam and the intermediate beam forming part of the surface deck board. 4 and 5 which are vertical sectional views, the problem of the above-described conventional synthetic resin pallet, in other words, the problem to be solved by the present invention will be described.
[0004]
Reference numerals 1, 2, and 3 are slide cores that are pulled out to the front on the paper surface for forming a known movable mold, a stationary mold, and a fork insertion port constituting the mold. By pouring resin into the space formed by the movable mold 1, the fixed mold 2 and the slide core 3, the vertical wall p <b> 1 on the fork insertion port side of the corner girder is formed, and the vertically long shape formed on the lower surface of the fixed mold 2 By pouring the resin into the grooves 2a, the vertical ribs p2 of the lattice bars disposed between the corner girders and the intermediate girders constituting a part of the surface deck board are formed.
[0005]
As shown in FIG. 4, the vertical wall p1 on the fork insertion side of the corner girder and the vertical rib p2 of the lattice beam disposed between the corner girder and the intermediate girder constituting a part of the surface deck board. In order to form a round at the corner formed by the lower surface, the round of the corner 3a of the slide core 3 is formed, and at the same time the fixed mold 2 is in contact with the corner 3a where the round of the slide core 3 is formed. The corner 2b needs to be formed in a wedge shape with a sharp tip. Thus, if the corner 2b of the fixed mold 2 is formed in a wedge shape with a sharp tip, the strength of this part decreases, and this part collides with the movable mold 1, the slide core 3 and other objects. If it happens, it will be easily deformed or damaged.
[0006]
In order to solve such a problem, as shown in FIG. 5, when a concave portion 2 c cut horizontally is formed in the corner 2 b of the fixed die 2, the fixed die as shown in FIG. 4 is formed. Although the corner portion 2b of 2 is not formed in a wedge shape with a sharp tip, the reinforcing edge p3 having a horizontal upper surface is formed on the vertical wall p1 on the fork insertion port side of the formed corner beam. It will be. Such a reinforcing edge p3 with a horizontal upper surface tends to collect dust, dirt, rainwater, and the like, and the detergency of dust and dirt collected on the reinforcing edge p3 with a horizontal upper surface deteriorates, and drainage of rainwater. There is a problem that the nature is bad.
[0007]
The objective of this invention is providing the synthetic resin pallet with favorable moldability while solving the subject which the conventional synthetic resin pallet mentioned above has.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention includes a front deck board, a rear deck board, and a corner beam, a middle beam, and a central beam that connect the front deck board and the rear deck board. The top part of the intermediate beam is formed by T-shaped bars arranged at a predetermined interval, and the corner beam and the bottom part of the intermediate beam are alternately arranged with respect to the T-shaped beam forming the top part. In the integrally molded four-way synthetic resin pallet formed by inverted T-shaped crosspieces, a fixed mold disposed at the corner formed by the rounds located above the corner beam side and the intermediate beam side of the slide core the corners of the movable mold disposed in the corners of and the corner portion formed by radius located below the corner digit side and the middle digit side of the slide core, respectively, forms an inclined surface that takes the corner By fork plugging The side, and, in Sumiketa an intermediate digit of a vertical wall positioned near the lower end of the grid crosspieces forming the surface deck board positioned between the Sumiketa and the intermediate girder, upper surface inclined downward, and, A lattice beam that forms a reinforcing edge having a substantially triangular cross section with a bottom surface inclined upward , and a back deck board that is located on the fork insertion port side and between the corner beam and the intermediate beam In the vertical walls of the corner and intermediate girders located near the upper end, a reinforcing edge having a substantially triangular cross section with an upper surface inclined downward and a lower surface inclined upward is formed .
[0009]
【Example】
1 is a perspective view including a partially cutout portion of the synthetic resin pallet of the present invention, and FIG. 2 is a vertical sectional view of a mold or the like for molding a portion along the line II in FIG. The embodiment of the present invention will be described with reference to FIG. 3 which is a vertical sectional view in the vicinity of the corner beam of FIG. 2, but is not limited to the present embodiment as long as the gist of the present invention is not exceeded.
[0010]
P is a so-called four-way synthetic resin pallet having two fork insertion holes p10 on each side surface. The synthetic resin pallet P has a front deck board p11 and a back deck board p12. is doing. The front deck board p11 and the back deck board p12 each have four corner girders p13 located in the corner, four middle girders p14 located in the middle of the corner p13, and one central girder p15 located in the center. It is connected by. Further, the surface deck board p11 located between the corner beam p13 and the intermediate beam p14 is formed on a lattice beam p16 in which vertically long vertical ribs p16 ′ are arranged in a lattice shape.
[0011]
A characteristic structure of the mold for injection molding the synthetic resin pallet P having the above-described structure and the molded synthetic resin pallet P of the present invention will be described with reference to FIGS.
[0012]
M is a mold as an example for injection molding the synthetic resin pallet P having the above-described structure, and the mold M is for forming a known movable mold 10, a fixed mold 11 and a fork insertion port p10. It is comprised from the slide core 12 pulled out in this paper surface.
[0013]
The corner beam p13 formed by the above-described mold M is formed in a cylindrical shape surrounded by a vertical wall p13a as shown in the cutout portion of FIG. p13b is formed by T-shaped bars p13b ′ arranged at a predetermined interval, and the bottom part p13c is an inverted T-shaped bar arranged alternately with respect to the T-shaped bars p13b ′ forming the top part p13b. It is formed by p13c ′. A cylindrical intermediate girder p14 surrounded by a vertical wall p14a also forms a top part p14b composed of T-shaped bars p14b 'arranged at a predetermined interval and the top part p14b, similarly to the corner girder p13. It is comprised from the bottom part p14c which consists of the reverse T-shaped crosspiece p14c 'arrange | positioned alternately with respect to the T-shaped crosspiece p14b'. The surface deck board p11 located between the corner beam p13 and the intermediate beam p14 is configured as a lattice beam p16 in which vertically long vertical ribs p16 ′ are arranged in a lattice pattern. In the present embodiment, the back deck board p12 positioned between the corner beam p13 and the intermediate beam p14 is also formed on a lattice beam p17 in which vertically long vertical ribs p17 ′ are arranged in a lattice pattern.
[0014]
In order to mold the corner beam p13 having the above-described structure, the movable mold 10 of this portion has two columnar portions 10a each having a longitudinal groove 10a ′ formed on the upper surface and a flat upper surface disposed on the fork insertion port p10 side. In order to form the corner beam p13 having the above-described structure, the fixed mold 11 of this portion has two columnar portions 11a having a vertically long groove 11a ′ formed on the lower surface. The two columnar portions 11a have an upper surface disposed between the two columnar portions 10a in which the longitudinal groove 10a ′ of the movable mold 10 is formed and on the columnar portion 10a and the fork insertion port p10 side. It is comprised so that it may fit between the flat columnar parts 10b.
[0015]
In order to mold the intermediate beam p14 having the above-described structure, the movable mold 10 of this part is formed with one columnar portion 10c having a flat upper surface disposed on the fork insertion port p10 side and a vertically long groove 10d ′ formed on the upper surface. In order to form the intermediate beam p14 having the above-described structure, the fixed die 11 of this portion has two columnar portions 11b each having a vertically long groove 11b ′ formed on the lower surface. The two columnar portions 11b have an upper surface disposed between the two columnar portions 10d formed with the longitudinal grooves 10d ′ of the movable mold 10 and on the side of the columnar portion 10d and the fork insertion port p10. It is comprised so that it may fit between the flat columnar parts 10c.
[0016]
The slide core 12 that is pulled forward in the paper for forming the fork insertion port p10 has a rectangular shape with a vertical cross-sectional shape that is horizontally long, and four corners of the round core 12a having an appropriate radius of curvature. Is formed. In addition, in order to form a lattice beam p16 in which the vertically long vertical ribs p16 ′ of the surface deck board p11 located between the corner beam p13 and the intermediate beam p14 are arranged in a lattice shape, the lower surface of this portion of the fixed mold 11 The vertically long grooves 11c are formed in a lattice shape. In the present embodiment, the back deck board p12 located between the corner beam p13 and the intermediate beam p14 is similarly formed with a lattice beam p17 in which vertically long vertical ribs p17 ′ are arranged in a lattice pattern. The vertically long grooves 10e are formed in a lattice shape on the upper surface of the movable mold 10 in this portion.
[0017]
At the corner of the fixed mold 11 arranged at the corner formed by the vertical wall p13a located on the fork insertion opening p10 side of the corner beam p13 and the round 12a located above the corner beam p13 side of the slide core 12 An inclined surface 11d is formed so as to take the corner. When the synthetic resin pallet P is injection-molded by the rounded corners 12a of the slide core 12 and the inclined surfaces 11d of the corners of the fixed mold 11, the corner p13 is positioned on the fork insertion port p10 side. In addition, on the vertical wall p13a located near the lower end of the lattice beam p16 of the surface deck board p11 located between the corner beam p13 and the intermediate beam p14, the upper surface e1 ′ is inclined downward and the lower surface e1 ″ In this way, the reinforcing edge e1 whose vertical cross section is substantially triangular is formed.
[0018]
Further, the corner of the movable mold 10 disposed at the corner formed by the vertical wall p13a located on the fork insertion opening p10 side of the corner beam p13 and the round 12a located below the corner beam p13 side of the slide core 12. Is formed with an inclined surface 10f, and the corners 12a of the slide core 12 and the inclined surface 10f of the corner of the movable mold 10 are used to form corners during injection molding of the synthetic resin pallet P. On the vertical wall p13a located near the upper end of the lattice bar p17 of the back deck board p12 located between the corner girder p13 and the intermediate girder p14, the upper surface e2 'is located on the fork insertion port p10 side of the girder p13. A reinforcing edge e2 is formed which is inclined downward and the lower surface e2 ″ is inclined upward. The vertical cross-sectional shape is substantially triangular. The back surface deck positioned between the corner beam p13 and the intermediate beam p14. In the case where the grid bar p17 is not formed on the keyboard p12, naturally, such a reinforcing edge e2 is not formed.
[0019]
Similarly, the corner of the fixed mold 11 arranged at the corner formed by the vertical wall p14a located on the fork insertion port p10 side of the intermediate beam p14 and the round 12a located above the intermediate beam p14 side of the slide core 12. An inclined surface similar to the above-described inclined surface 11d is also formed on the portion, and when the synthetic resin pallet P is injection-molded, it is located on the fork insertion port p10 side of the intermediate beam p14, and the corner beam On the vertical wall p14a located near the lower end of the lattice beam p16 of the surface deck board p11 located between the p13 and the intermediate beam p14, a reinforcing edge having a substantially triangular cross section similar to the reinforcing edge e1 described above is formed. Will be. Further, when the lattice beam p17 is formed on the back deck board p12 located between the corner beam p13 and the intermediate beam p14, it is positioned on the fork insertion port p10 side of the intermediate beam p14, and between the corner beam p13 and the intermediate beam p13. The vertical wall p14a located in the vicinity of the upper end portion of the lattice bar p17 of the back deck board p12 located between the girders p14 is also formed with a reinforcing edge having a substantially triangular cross section similar to the reinforcing edge e1 described above. Is preferred.
[0020]
As described above, the corners of the fixed mold 11 arranged at the corners formed by the rounds 12a located above the corner beam p13 of the slide core 12 and the corners of the slide core 12 below the corner beam p13 side. Since the corners of the movable mold 10 disposed at the corners formed by the rounds 12a are respectively formed with inclined surfaces 11d and 10f that take corners, the fixed mold 11 and the movable mold 10 are In this case, since the protruding portion having a sharp tip is not formed, the strength and durability of the mold are improved.
[0021]
Further, the reinforcing edges e1 and e2 formed at the corners of the fork insertion port p10 of the plastic pallet P injection-molded by the mold M described above have the upper surfaces e1 ′ and e2 ′ inclined downward, and Since the lower surface e1 ″, e2 ″ is inclined upward and the vertical cross-sectional shape is formed in a substantially triangular shape, dust, dust, rainwater, etc. are difficult to collect on the upper surface e1 ′, e2 ′, and the upper surface e1 ′, e2 As well as good detergency of dust and dirt collected in ', drainage of rainwater will be improved.
[0022]
The reinforcing edges e1 and e2 described above have a horizontal protrusion length of preferably 5 to 6 mm or less, and more preferably 3 mm or less. Further, the angle formed between the upper surfaces e1 ′ and e2 ′ and the lower surfaces e1 ″ and e2 ″ is preferably in the range of 30 to 120 degrees, and more preferably in the range of 45 to 90 degrees.
[0023]
In the embodiment described above, an example in which a so-called four-way synthetic resin pallet P having two fork insertion ports p10 on each side surface is integrally formed has been described. It can also be applied to a so-called two-way synthetic resin pallet P in which fork insertion holes p10 are formed only on one of the opposing side surfaces. Further, the above-described synthetic resin pallet P is formed in half in the vertical direction separately, and the formed half pallet is applied to the synthetic resin pallet P formed by welding at the spar. You can also.
[0024]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0025]
The reinforcing edge has an upper surface inclined downward and a lower surface inclined upward, and the vertical cross-sectional shape is formed in a substantially triangular shape. Therefore, it is difficult for dust, dirt, rainwater, etc. to collect on the upper surface, and it accumulates on the upper surface. In addition to good cleaning properties such as dust and dust, the drainage of rainwater is improved.
[0026]
Since the reinforcing edge is formed so that the upper surface is inclined downward and the lower surface is inclined upward and the vertical cross-sectional shape is substantially triangular, the mold has a protruding portion with a sharp tip. As a result, the strength and durability of the mold are improved.
[Brief description of the drawings]
FIG. 1 is a perspective view including a partially cutout portion of a synthetic resin pallet according to the present invention.
2 is a vertical cross-sectional view of a mold or the like for molding a portion along the line II in FIG. 1. FIG.
FIG. 3 is a vertical sectional view near the corner beam of FIG. 2;
FIG. 4 is a diagram for forming a corner formed by a vertical wall of a corner beam and a lower surface of a lattice beam disposed between a corner beam and a middle beam forming a part of a surface deck board; It is a vertical sectional view including a conventional mold.
FIG. 5 is a vertical sectional view including a conventional mold similar to FIG.
[Explanation of symbols]
M ································································································· Reinforcement edge Back deck board p13 ... Corner girder p14 ... Intermediate girder 10 ... Movable type 11 ... Fixed type 12 ... Slide core

Claims (1)

It has a front deck board, a rear deck board, and a corner girder, a middle girder, and a central girder that connect the front deck board and the rear deck board, and the tops of the corner girder and the middle girder are arranged at predetermined intervals. The bottom part of the corner beam and the intermediate beam is formed by an inverted T-shaped bar arranged alternately with respect to the T-shaped beam forming the top part. In a four-sided synthetic resin pallet, the fixed corners arranged at the corners formed by the rounds located above the corner girder side and middle girder side of the slide core and the corner girder side and middle girder of the slide core the corners of the movable mold disposed in a corner portion formed by radius located below the side, respectively, by forming an inclined surface that takes the corner, a fork insertion port side, and the corner Located between the digit and the middle digit The Sumiketa an intermediate digit of a vertical wall positioned near the lower end of the grid crosspieces forming the surface deck board, the upper surface is inclined downward, and the lower surface is inclined upward, reinforcing vertical sectional shape like a substantially triangular Corner girder and middle girder vertical walls located on the fork insertion side and near the upper end of the lattice beam that forms the back deck board located between the corner girder and middle girder, with an edge formed Further, a synthetic resin pallet characterized in that a reinforcing edge having a substantially triangular shape in vertical cross section is formed with the upper surface inclined downward and the lower surface inclined upward .

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