JP2984981B2 - Method of manufacturing wooden pallets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a wooden pallet.

[0002]

FIG. 6 is a perspective view showing a conventional wooden pallet. In FIG. 6, 1 is a pallet, 2 is a plate material, 3 is a digit material, and 4 is a fork insertion opening formed by the plate material 2 and the digit material 3. The plate members 2 and the digit members 3 are joined to each other by hitting a nail (not shown) from above each plate member 2 toward the digit member 3.

[0003]

In such a conventional wooden pallet 1, as described above, the plate 2 and the digit 3 are nailed with nails.
However, the following problems have been pointed out in connection of wood with nails. That is, wood having a coarse particle such as cedar wood cannot provide sufficient bonding strength by using only nails. Therefore, conventionally, wood pallets and the like cannot be manufactured from cedar wood. Further, the method of joining wood with a nail has inconveniences such as the wood being broken by a nail. Also, in the method of joining wood with a nail, the head of the nail is exposed at the part where it is joined with the nail, so the exposed head may damage the cardboard box or plastic bag of the cargo, There is a problem that the head of the nail is exposed and the appearance becomes worse.

The present invention has been made in view of such problems of the prior art, and can effectively join even coarse-grained wood such as cedar wood, and the wood may be broken by nails. In addition, there are no inconveniences such as damage to the cardboard box or plastic bag of the cargo due to the exposed head of the nail, or deterioration of the appearance of the nail when the nail head is exposed. It is an object of the present invention to provide a method for manufacturing a wooden pallet, in which bonding with an adhesive can be performed very efficiently.

[0005]

A method for manufacturing a wooden pallet according to the present invention for achieving the above object includes the following steps (a) to (d). (A) Concave portions or convex portions are respectively formed on the upper surface and the lower surface of a plurality of wooden digit members, and mesh with the concave or convex portions of the digit material on the joint surfaces of the plurality of wooden plate members with the digit members, respectively. A step of forming a convex portion or a concave portion,
The interlocking convex and concave portions are formed so that their heights are the same as each other and their widths are such that the convex portions are slightly larger than the concave portions, and as a result, When the two are engaged with each other, the convex portion and the concave portion are formed such that the convex portion shrinks in the concave portion and the two are held pressed against each other by a force that attempts to restore the original size. (B) applying an adhesive to at least one of the upper and lower surfaces of the digit material and the joining surface of the plate material; and (c) the upper and lower surfaces of the digit material and the lower surface. A step of overlapping the joining surface of the plate material with each other so that the concave portion and the convex portion engage with each other; (d) After the above (c), an external device is used for the solidifying time of the adhesive. The above-mentioned digit wood Without continuing the plate was crimped to one another, just by lapse of time, the step of completing the junction between the spar and the plate.

According to the present invention, recesses or protrusions are formed on the surfaces of two pieces of wood that are to be joined to each other in advance, and an adhesive is applied to at least one of the joining faces. In this state, the respective joining surfaces are overlapped by engaging the concave portion and the convex portion. Then, the adhesive is solidified in that state, and the joining of the wood is completed. As described above, in the present invention, since the concave portion and the convex portion are formed on the joining surface, the application area of the adhesive increases accordingly, and the joining strength by the adhesive improves.

Further, in the present invention, the convex portion is formed so that its width is slightly larger than the width of the concave portion. Therefore, when an adhesive is applied to at least one of the bonding surfaces and the bonding surfaces are overlapped, the convex portion engaged with the concave portion is in a contracted state in the concave portion. At this time, since the convex portion attempts to restore the original size in the concave portion, the convex portion is strongly pressed to the concave portion. As a result, the two woods will continue to be strongly pressed together. Since the adhesive is solidified in a state in which the two woods are pressed together, there is no need to press the two woods together using an external device or the like until the adhesive is solidified. Bonding with the agent can be performed very efficiently.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. FIG. 1 is a perspective view for explaining a method for manufacturing a wooden pallet according to Embodiment 1 of the present invention. In FIG. 1, 13
Reference numerals a, 13b, and 13c denote digit materials of the pallet, and 12 denotes plate materials of the pallet. In this embodiment, the digit materials 13a, 13
Projections 5a, 5b, 5c having a substantially W-shaped cross section are formed on the upper and lower surfaces of b, 13c, respectively. Also,
Concave portions 6a, 6b, 6c are formed on the back surface of the plate member 12 (surfaces to be joined to the digit members 13a, 13b, 13c) so as to be able to engage with the convex portions 5a, 5b, 5c, respectively. In the first embodiment, three digits 13
a, 13b, 13c and these digitized materials 13a, 13
A pallet is composed of five plate members 12 (only two are shown in FIG. 1 for convenience) joined to the upper surfaces of the b and 13c and five plate members (not shown) joined to the lower surface of the digit member 12. To assemble. In the first embodiment,
The projections 5a and 5c are not formed on both sides 13a 'and 13c' of the digit members 13a and 13c. This is because when the pallet is assembled, the projections 5a, 5
In this case, the appearance of the entire pallet is improved by making c invisible.

FIG. 2 is a sectional view for explaining the convex portions 5a, 5b, 5c and the concave portions 6a, 6b, 6c of FIG. In this embodiment, the height l of the projections 5a, 5b, 5c is the height l 'of the corresponding depressions 6a, 6b, 6c so as to mesh with the projections.
However, the width α of the projections 5a, 5b, 5c is formed to be slightly larger than the width α ′ of the corresponding depressions 6a, 6b, 6c so that they engage with each other. Therefore, in the present embodiment, when the convex portions 5a, 5b, 5c are engaged with the corresponding concave portions 6a, 6b, 6c, respectively,
a, 5b, and 5c are accommodated in a contracted state in the concave portions 6a, 6b, and 6c. (In the case of the above-described engagement, the width of the convex portion is slightly larger than the width of the concave portion. , There is some resistance in the engagement,
A certain amount of force is required to engage the projection with the recess). In this state, the projections 5a, 5b, and 5c attempt to restore the original size in the recesses 6a, 6b, and 6c, so that the projections 5a, 5b, and 5c are pressed against the recesses 6a, 6b, and 6c. As a result, the digit members 13a, 13b, and 13c are strongly pressed to the plate material 12.

Therefore, in this embodiment, for example, the joining surfaces (projections 5a, 5
b, 5c), and the plate material 12 is superimposed thereon so that the concave portions 6a, 6b, 6c engage with the convex portions 5a, 5b, 5c.
3c and the plate 12 are instantaneously strongly pressed to each other only by engaging the concave portions 5a, 5b, 5c and the convex portions 6a, 6b, 6c. Then, the adhesive is solidified over time in this pressed state, and the joining is completed. Therefore, in this example, it is not necessary to press the digitized material and the plate material together with an external device or the like only for the time until the adhesive is solidified, and the workability for solidifying the adhesive is extremely good. . Further, since the adhesive is also interposed between the convex portions 5a, 5b, 5c and the concave portions 6a, 6b, 6c, the application area of the adhesive increases as compared with the case where there is no convex portion or concave portion, As a result, the bonding strength of the adhesive can be further increased.

Embodiment 2 FIG. Next, FIG. 3 is a sectional view for explaining Embodiment 2 according to the present invention. In the second embodiment, a convex portion 25a having a substantially V-shaped cross section is formed on the digit member 23a, and a concave portion 26a engaging with the convex portion 25a is formed on the plate member 22. In the second embodiment, the height l of the convex portion 25a is the same as the height l 'of the concave portion 26a, but the width α is slightly larger than the width α' of the concave portion 26a. I have. Therefore, according to the second embodiment, the first embodiment is also used.
The same effect as described above is achieved.

Embodiment 3 FIG. Next, FIG. 4 is a sectional view for explaining a third embodiment according to the present invention. In the third embodiment, two protrusions 35a each having a substantially quadrangular cross section are formed on the digit material 33a, and two recesses 36a meshing with the two protrusions 35a are formed on the plate member 22. In the third embodiment, the height m of the convex portion 35a is the same as the height m 'of the concave portion 36a, but the width β is slightly larger than the width β' of the concave portion 36a. I have. Therefore, the third embodiment
Accordingly, the same effects as those of the first or second embodiment can be obtained.

Embodiment 4 FIG. Next, FIG. 5 is a sectional view for explaining Embodiment 4 according to the present invention. In the fourth embodiment, a convex portion 45a having a substantially trapezoidal cross section is formed on the digit member 43a, and a concave portion 46a having a shape that engages with the convex portion 45a is formed on the plate member 42. In the fourth embodiment, the height n of the protrusion 45a is the same as the height n ′ of the recess 46a, but the width γ is slightly larger than the width γ ′ of the recess 46a. I have. Therefore, according to the third embodiment, the same effects as those of the first to third embodiments can be obtained.

In the first to fourth embodiments, an example is shown in which the adhesive is applied to the joining surfaces of the digit members 13a, 13b, 13c. However, the adhesive is applied to the joining surface on the plate 12 side. Alternatively, an adhesive may be applied to each of the joining surfaces of the digit members 13a, 13b, 13c and the plate member 12. Further, in the above embodiment, the digit materials 13a, 1
Convex portions 5a, 5b, 5c are formed on the upper and lower surfaces of 3b, 13c, and concave portions 6a, 6b, 6c are formed on the plate 12 so as to engage with the convex portions 5a, 5b, 5c. The present invention is not limited to this.
A concave portion may be formed on the upper and lower surfaces of 3a, 13b and 13c, and a convex portion engaging with the concave portion may be formed on the plate material 12.

As described above, in the above embodiment, the concave and convex portions each having a shape that engage with each other are formed on the joining surface of the two pieces of wood to which the adhesive is applied. The application area increases accordingly, and the bonding strength by the adhesive is improved accordingly, and sufficient bonding strength can be obtained even with the adhesive. Therefore, even wood such as cedar wood, which cannot obtain a necessary bonding strength depending on nails due to coarse particles, can be effectively bonded. Further, since no nail is used for joining, inconvenience such as cracking of the wood by the nail as in the related art is eliminated. In addition, since nails are not used for joining, the exposed nail heads may damage the cardboard box or plastic bag on the joined wood with the exposed nail heads or the nail heads Inconveniences such as exposure and deterioration of appearance are eliminated.

Further, in the above embodiment, since the convex portion is formed so that its width is slightly larger than the width of the concave portion, an adhesive is applied to at least one of the joint surfaces. When the joining surfaces are overlapped after the application, the convex portion engaged with the concave portion is in a contracted state in the concave portion and attempts to restore the original size in the concave portion. It is crimped strongly. As a result, the two woods will continue to be strongly pressed together. Since the adhesive is solidified in a state in which the two woods are pressed together, there is no need to press the two woods together using an external device or the like until the adhesive is solidified. Bonding with the agent can be performed very efficiently.

[0017]

As described above, in the method for manufacturing a wooden pallet according to the present invention, at least two of the plurality of lumbers constituting the pallet are provided with concave or convex shapes having a shape that engage with each other. Since a portion is formed and an adhesive is interposed between these surfaces to be joined, the area of application of the adhesive is increased by the convex portion and the concave portion, and the bonding by the adhesive is performed. The strength can be improved accordingly. Therefore, it is possible to manufacture a wooden pallet using wood, such as cedar wood, which has a coarse particle and cannot obtain a necessary bonding strength depending on a nail. Further, since no nail is used for joining the wood on the wooden pallet, the inconvenience such as the cracking of the wood by the nail as in the related art is eliminated. In addition, since no nails are used for joining, the exposed nail heads of the wooden pallets may damage the cardboard box or plastic bag of the cargo, or the nail heads may be exposed Inconvenience such as getting worse is eliminated.

In the method for manufacturing a wooden pallet according to the present invention, the convex portion is formed so that its width dimension is larger than the width dimension of the concave portion. The convex portion shrinks in the concave portion, and the convex portion attempts to restore the original size in the concave portion, so that the convex portion is strongly pressed to the concave portion. As a result, even if the wood (digits and plate materials) is not pressed against each other by an external device, the wood having the projections is strongly pressed against the wood having the recesses. Therefore,
The adhesive is solidified in a state in which the two pieces of wood are pressed together by the protrusions and the recesses without pressing the two pieces of wood using an external device. That is, according to the production method of the present invention, it is not necessary to press the two wood pieces together with an external device or the like until the adhesive solidifies. Therefore, according to the manufacturing method of the present invention, it is not necessary to perform the operation of “compressing and bonding using an external device for the time required for solidifying the adhesive” for solidifying the adhesive. In addition, the work efficiency of the joining between the digitized material and the plate material by the adhesive is greatly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining a method of manufacturing a wooden pallet according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a concave portion and a convex portion according to the first embodiment.

FIG. 3 is a sectional view illustrating a concave portion and a convex portion according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a concave portion and a convex portion according to a third embodiment of the present invention.

FIG. 5 is a sectional view illustrating a concave portion and a convex portion according to a fourth embodiment of the present invention.

FIG. 6 is a perspective view showing a conventional wooden pallet.

[Explanation of symbols]

5a, 5b, 5c, 25a, 35a, 45a Convex portions 6a, 6b, 6c, 26a, 36a, 46a Concave portions 12, 22, 32, 42 Plate materials 13a, 13b, 13c, 23a, 33a, 43a Digit materials

Continuation of the front page (72) Inventor Hiroshi Okuno 541-12 Kawato, Higashikawa, Ube-shi, Yamaguchi Prefecture Inside Ube Pallet Co., Ltd. JP, U) Asakura Shoten Co., Ltd. “Technical Series Woodworking” (March 15, 1985), page 43, left column, 11th row, etc.

Claims (1)

(57) [Claims] 1. A method for manufacturing a wooden pallet, comprising the following steps (a) to (d). (A) Concave portions or convex portions are respectively formed on the upper surface and the lower surface of a plurality of wooden digit members, and mesh with the concave or convex portions of the digit material on the joint surfaces of the plurality of wooden plate members with the digit members, respectively. A step of forming a convex portion or a concave portion,
The interlocking convex and concave portions are formed so that their heights are the same as each other and their widths are such that the convex portions are slightly larger than the concave portions, and as a result, When the upper surface and the lower surface of the digitized material and the joint surface of the plate material are overlapped with each other, the convex portions shrink in the concave portions, and the two materials are separated from each other by a force that tries to restore the original size. Forming the projections and depressions so as to be kept pressed, (b) bonding to at least one of the upper surface and the lower surface of the digit material and the joining surface of the plate material A step of applying an agent; (c) a step of overlapping the upper surface and the lower surface of the digit material with the joining surface of the plate material so that the concave portion and the convex portion engage with each other; after c), During the time required for the solidification of the adhesive, the adhesive is solidified by simply allowing the time to elapse without continuing to press the digitized material and the plate material to each other using an external device to solidify the adhesive. A step of completing the joining of the sheet and the plate material.