JP7583979B2 - Joint structure and structure of components - Google Patents

Description

The present invention relates to a joining structure for members and a structure.

Joining structures for joining components have been proposed in the past. Patent Document 1 discloses a corner structure for a pipe assembly in which holes that fit horizontal pipes are provided on two adjacent faces of a corner rectangular vertical pipe, and the ends of the horizontal pipes inserted into each hole are welded and fixed inside the vertical pipe.

Japanese Utility Model Application Publication No. 58-36609

In the corner structure disclosed in Patent Document 1, the strength of the joint structure of the pipes is determined by welding, making it difficult to improve the strength of the joint structure.
The present invention has been made in consideration of the above-mentioned problems, and has an object to improve the strength of a joint structure.

The present invention relates to a joining structure for members that joins a first long member, a second long member, and a third long member, the first member having a cross-sectional shape that is substantially circular and hollow when cut in a direction perpendicular to the longitudinal direction, and having a first opening that opens in the longitudinal direction, and a second opening and a third opening that open in the direction perpendicular to the longitudinal direction, the second member having a cross-sectional shape that is substantially rectangular and hollow when cut in a direction perpendicular to the longitudinal direction, and having a fourth opening that is substantially parallelogram-shaped and opens in the direction perpendicular to the longitudinal direction at one end in the longitudinal direction, and a third opening that is substantially parallelogram-shaped and opens in the direction perpendicular to the longitudinal direction at one end in the longitudinal direction, and a fourth opening that is substantially parallelogram-shaped and opens in the direction perpendicular to the longitudinal direction at one end in the longitudinal direction, and a third opening that is substantially parallelogram-shaped and opens in the direction perpendicular to the longitudinal direction at one end in the longitudinal direction. The third member has a hollow, generally rectangular cross section cut in a direction perpendicular to the longitudinal direction, a generally parallelogram -shaped fifth opening at one end in the longitudinal direction in a direction perpendicular to the longitudinal direction, and a pair of slits provided in each of the side walls on both sides of the fifth opening, and the second member and the third member have a pair of slits provided in one side wall of the second member, one slit of the pair of slits provided in one side wall of the third member, and one slit of the pair of slits provided in the other side wall of the third member. a pair of slits provided on the other side wall of the second member, the other of the pair of slits provided on one side wall of the third member, and the other of the pair of slits provided on the other side wall of the third member are fitted together, the pair of slits being fitted together within the first opening, one of the second member and the third member is inserted through the second opening, the other of the second member and the third member is inserted through the third opening, and the pair of slits provided on one side wall sandwiching the fourth opening and the other of the pair of slits provided on the other side wall sandwiching the fourth opening are fitted together within the first opening. The pair of slits provided in the wall are positioned diagonally with respect to the longitudinal direction of the second member, and the pair of slits provided in one of the side walls on either side of the fifth opening and the pair of slits provided in the other side wall on either side of the fifth opening are positioned diagonally with respect to the longitudinal direction of the third member, and the end on the one end side of the second member is formed in a circular arc shape that convex outwardly with a radius of curvature that is approximately the same as the inner circumferential surface of the first opening, and the end on the one end side of the third member is formed in a circular arc shape that convex outwardly with a radius of curvature that is approximately the same as the inner circumferential surface of the first opening .

The present invention can improve the strength of the joint structure.

FIG. 2 is a perspective view illustrating an example of a structure according to the first embodiment. FIG. 2 is an exploded perspective view showing an example of a structure of the first embodiment. FIG. 2 is a perspective view showing a state before members are joined together. FIG. 4 is a perspective view showing the state after the members are joined. FIG. 11 is a perspective view showing an example of a structure according to a second embodiment. FIG. 2 is a perspective view showing a state before members are joined together. FIG. 13 is a perspective view showing an example of a structure according to a third embodiment. FIG. 2 is a perspective view showing a state before members are joined together.

Hereinafter, the joining structure of members according to this embodiment will be described with reference to the drawings.
First Embodiment
Fig. 1 is a perspective view showing an example of a structure 10. Fig. 2 is an exploded perspective view showing an example of the structure 10.
The structure 10 of this embodiment is used as a framework of a container for logistics, warehouse, residence, etc. The structure 10 is configured into a substantially rectangular parallelepiped shape by joining a plurality of frames.

The structure 10 has four support members 20a-20d, four upper frame members 30a-30d, four lower frame members 40a-40d, and seven reinforcing frame members 50a-50g.
The support members 20a to 20d are elongated or rod-shaped members along the vertical direction. The support members 20a to 20d are axially shaped along the longitudinal direction. The support members 20a to 20d are approximately the same length. The support members 20a to 20d correspond to an example of a first member. The support members 20a to 20d have a cross-sectional shape cut in a direction perpendicular to the longitudinal direction that is approximately hollow and rectangular. The cross-sectional shape of the support members 20a to 20d of this embodiment is approximately square. In addition, the support members 20a to 20d of this embodiment are made of, for example, metal. However, the shape and material of the support members 20a to 20d are not particularly limited.
The upper and lower ends of the support members 20a to 20d are each processed as described below, and the same material including the processing can be used.

The upper frame members 30a to 30d are elongated or rod-shaped members along the horizontal direction. The upper frame members 30a to 30d are axially shaped along the longitudinal direction. The upper frame members 30a and 30c have approximately the same length, and the upper frame members 30b and 30d have approximately the same length. The upper frame members 30a and 30c are longer than the upper frame members 30b and 30d. The upper frame members 30a to 30d correspond to an example of the second member or the third member. The upper frame members 30a to 30d have a cross-sectional shape cut in a direction perpendicular to the longitudinal direction that is approximately hollow and rectangular. The cross-sectional shape of the upper frame members 30a to 30d in this embodiment is approximately square. In addition, both ends of the upper frame members 30a to 30d in this embodiment are straight lines perpendicular to the longitudinal direction in a plan view. In addition, the upper frame members 30a to 30d in this embodiment are made of, for example, metal. However, the shape and material of the upper frame members 30a to 30d are not particularly limited.
Both ends of each of the upper frame members 30a to 30d are processed as described below. The upper frame members 30a and 30c may be made of the same material, including the processing, and the upper frame members 30b and 30d may be made of the same material, including the processing.

The upper frame member 30a is disposed between the upper end of the support member 20a and the upper end of the support member 20d, the upper frame member 30b is disposed between the upper end of the support member 20a and the upper end of the support member 20b, the upper frame member 30c is disposed between the upper end of the support member 20b and the upper end of the support member 20c, and the upper frame member 30d is disposed between the upper end of the support member 20c and the upper end of the support member 20d.

The lower frame members 40a to 40d are elongated or rod-shaped members along the horizontal direction. The lower frame members 40a to 40d are axially shaped along the longitudinal direction. The lower frame members 40a and 40c have approximately the same length, and the lower frame members 40b and 40d have approximately the same length. The lower frame members 40a and 40c are longer than the lower frame members 40b and 40d. The lower frame members 40a to 40d correspond to an example of the second member or the third member. The lower frame members 40a to 40d have a cross-sectional shape cut in a direction perpendicular to the longitudinal direction that is approximately hollow and rectangular. The cross-sectional shape of the lower frame members 40a to 40d of this embodiment is approximately square. In addition, both ends of the lower frame members 40a to 40d of this embodiment are straight lines perpendicular to the longitudinal direction in a plan view. In addition, the lower frame members 40a to 40d of this embodiment are made of, for example, metal. However, the shape and material of the lower frame members 40a to 40d are not particularly limited.
Both ends of the lower frame members 40a to 40d are processed in the same manner as the upper frame members 30a to 30d. The lower frame members 40a and 40c can be made of the same material, including the processing, and the lower frame members 40b and 40d can be made of the same material, including the processing.

The lower frame member 40a is disposed between the lower end of the support member 20a and the lower end of the support member 20d, the lower frame member 40b is disposed between the lower end of the support member 20a and the lower end of the support member 20b, the lower frame member 40c is disposed between the lower end of the support member 20b and the lower end of the support member 20c, and the lower frame member 40d is disposed between the lower end of the support member 20c and the lower end of the support member 20d.

The reinforcing frame members 50a to 50g are long or rod-shaped members extending horizontally. The reinforcing frame members 50a to 50g each have approximately the same length. The reinforcing frame members 50a to 50g each have a hollow, approximately rectangular cross-sectional shape cut in a direction perpendicular to the longitudinal direction. In this embodiment, the reinforcing frame members 50a to 50g are made of, for example, metal. However, there are no particular limitations on the shape and material of the reinforcing frame members 50a to 50g.
The reinforcing frame members 50a-50g are each spaced apart across the lower frame members 40a and 40c.

The upper frame members 30a to 30d are joined at both ends to the upper ends of the support members 20a to 20d, and the lower frame members 40a to 40d are joined at both ends to the lower ends of the support members 20a to 20d, forming a roughly rectangular parallelepiped.

Next, as a representative example, a joining structure in which the support member 20a, the upper frame member 30a, and the upper frame member 30b are joined will be described.
FIG. 3 is a perspective view showing the state before the support member 20a and the upper frame members 30a and 30b are joined together.
The support member 20a has four side walls 21a to 21d. The upper end of the support member 20a has a first opening 26 that opens in the longitudinal direction (axial direction) of the support member 20a, and a second opening 27 and a third opening 28 that open in a direction perpendicular to the longitudinal direction.

The first opening 26 opens toward the upper side. The first opening 26 is an opening formed because the support member 20a is hollow.
The second opening 27 is an opening formed in the side wall 21d. The second opening 27 is a notched opening that is open at the top. The upper frame member 30a can be inserted into the second opening 27 from above. The second opening 27 is formed, for example, by cutting or punching the side wall 21d.
The third opening 28 is an opening formed in the side wall 21c. The third opening 28 is a notched opening that is open at the top. The upper frame member 30b can be inserted into the third opening 28 from above. The third opening 28 is formed, for example, by cutting or punching the side wall 21c.

The upper frame member 30a has two opposing side walls 31a, 31b, an upper wall 31c, and a lower wall 31d. The end of the upper frame member 30a facing the support member 20a has a fourth opening 32 that opens in a direction perpendicular to the longitudinal direction (axial direction) of the upper frame member 30a.

The fourth opening 32 is an opening formed in the upper wall 31c. In a plan view, the fourth opening 32 is substantially rectangular, and in this case, substantially square. The fourth opening 32 is formed at a position spaced a distance L from the end of the upper frame member 30a. The opening width W of the fourth opening 32 along the longitudinal direction of the upper frame member 30a is greater than the width W3 of the upper frame member 30b. The opening width W of the fourth opening 32 is substantially the same as the opening width W of the fifth opening 37 described later. In addition, the upper frame member 30a has a pair of slits 33 formed in each of the side walls 31a and 31b on both sides of the fourth opening 32. The slits 33 are formed at positions where the four corners of the fourth opening 32 are extended toward the lower wall 31d. The interval between the two slits 33 formed in each side wall 31a and 31b is substantially the same as the opening width W. A tongue portion 34 is formed between the two slits 33. The upper end of the tongue portion 34 is lower than the upper surface of the upper wall 31c, preferably lower than the upper surface of the upper wall 31c by about the thickness of the upper wall 31c. A pair of slits 33 formed in the side wall 31a and a pair of slits 33 formed in the side wall 31b are positioned perpendicular to the longitudinal direction of the upper frame member 30a. The slits 33 are formed to a position that is approximately half the vertical length of each side wall 31a, 31b, preferably beyond half the vertical length. The slit width Ws of each slit 33 is greater than the thickness of the side walls 36a, 36b of the upper frame member 30b, which will be described later.

The fourth opening 32 and the slit 33 are formed, for example, by cutting or punching the side walls 31a, 31b and the top wall 31c.
The upper frame member 30a has an identical opening formed at its end on the support member 20d side, and is given the same reference numerals as the fourth opening 32 and the slit 33. That is, the same processing can be performed on both ends of the upper frame member 30a, and processing costs can be reduced.

The upper frame member 30b has two opposing side walls 36a, 36b, an upper wall 36c, and a lower wall 36d. The end of the upper frame member 30b facing the support member 20a has a fifth opening 37 that opens in a direction perpendicular to the longitudinal direction (axial direction) of the upper frame member 30b.

The fifth opening 37 is an opening formed in the lower wall 36d. In a bottom view, the fifth opening 37 is substantially rectangular, and here substantially square. The fifth opening 37 is formed at a position spaced a distance L from the end of the upper frame member 30b. The distance L from the end of the upper frame member 30b to the fifth opening 37 is substantially the same as the distance L from the end of the upper frame member 30a to the fourth opening 32. The opening width W of the fifth opening 37 along the longitudinal direction of the upper frame member 30b is greater than the width W2 of the upper frame member 30a. The opening width W of the fifth opening 37 is substantially the same as the opening width W of the fourth opening 32 described above. In addition, the upper frame member 30b has a pair of slits 38 provided on each of the side walls 36a, 36b on both sides of the fifth opening 37. The slits 38 are formed at positions where the four corners of the fifth opening 37 are extended toward the upper wall 36c. The interval between the two slits 38 formed in each side wall 36a, 36b is approximately the same as the opening width W. A tongue portion 39 is formed between the two slits 38. The lower end of the tongue portion 39 is higher than the lower surface of the lower wall 36d, preferably higher than the lower surface of the lower wall 36d by approximately the thickness of the lower wall 36d. The pair of slits 38 formed in the side wall 36a and the pair of slits 38 formed in the side wall 36b are positioned perpendicular to the longitudinal direction of the upper frame member 30b. In addition, the slits 38 are formed up to approximately half the vertical length of each side wall 36a, 36b, preferably to a position above that half. The slit width Ws of each slit 38 is larger than the plate thickness of the side walls 31a, 31b of the upper frame member 30a. In addition, the slit width of the slit 38 of the upper frame member 30b is approximately the same as the slit width of the slit 33 of the upper frame member 30a.

The fifth opening 37 and the slit 38 are formed, for example, by cutting or punching the side walls 36a, 36b and the bottom wall 36d.
In addition, substantially the same opening is formed at the end of the upper frame member 30b on the support member 20b side, and is denoted by the same reference numerals as the above-mentioned fifth opening 37 and slit 38. In other words, substantially the same processing can be performed at both ends of the upper frame member 30b, and processing costs can be reduced.

The opening width W of the fourth opening 32 of the upper frame member 30a is approximately the same as the opening width W of the fifth opening 37 of the upper frame member 30b. In addition, the slit width of the slit 33 of the upper frame member 30a is approximately the same as the slit width of the slit 38 of the upper frame member 30b. Therefore, the end of the upper frame member 30a facing the support member 20a and the end of the upper frame member 30b facing the support member 20a can be processed in approximately the same manner, which reduces processing costs. In other words, by inverting the upper frame member 30b up and down, the shape of the end of the upper frame member 30a and the shape of the end of the upper frame member 30b are approximately the same.

Next, a method for joining the support member 20a and the upper frame members 30a and 30b will be described.
First, as shown in Fig. 3, the worker brings the upper frame member 30a and the upper frame member 30b close to each other by arranging the fourth opening 32 of the upper frame member 30a and the fifth opening 37 of the upper frame member 30b opposite each other. Then, the pair of slits 33 of the side wall 31a of the upper frame member 30a is fitted into one (end face side) of the pair of slits 38 of the side wall 36a of the upper frame member 30b and one (end face side) of the pair of slits 38 of the side wall 36b of the upper frame member 30b. Similarly, the pair of slits 33 of the side wall 31b of the upper frame member 30a is fitted into the other (opposite end face) of the pair of slits 38 of the side wall 36a of the upper frame member 30b and the other (opposite end face) of the pair of slits 38 of the side wall 36b of the upper frame member 30b. At this time, the tongue portion 34 of the side wall 31a and the tongue portion 34 of the side wall 31b of the upper frame member 30a are inserted into the fifth opening 37 of the upper frame member 30b, and the tongue portion 39 of the side wall 36a and the tongue portion 39 of the side wall 36b of the upper frame member 30b are inserted into the fourth opening 32 of the upper frame member 30a.

The upper frame members 30a and 30b are joined by fitting together until the ends of the slits 33 of the upper frame member 30a and the ends of the slits 33 of the upper frame member 30b come into contact. The upper frame members 30a and 30b may also be joined together by fitting together until the tongue portion 34 of the upper frame member 30a comes into contact with the upper wall 36c of the upper frame member 30b and the tongue portion 39 of the upper frame member 30b comes into contact with the lower wall 31d of the upper frame member 30a.
When the upper frame member 30a and the upper frame member 30b are joined together, the side walls 36a, 36b of the upper frame member 30b are positioned within the slits 33 of the upper frame member 30a, and the side walls 31a, 31b of the upper frame member 30a are positioned within the slits 33 of the upper frame member 30b. When the upper frame member 30a and the upper frame member 30b are joined together, the upper wall 31c of the upper frame member 30a and the upper wall 36c of the upper frame member 30b are substantially flat with no step. When the upper frame member 30a and the upper frame member 30b are joined together, the lower wall 31d of the upper frame member 30a and the lower wall 36d of the upper frame member 30b are substantially flat with no step.

Next, as shown in FIG. 4, the worker inserts the upper frame member 30a and the upper frame member 30b in a joined state into the first opening 26 of the support member 20a. At this time, the upper frame member 30a is inserted into the second opening 27 of the support member 20a, and the upper frame member 30b is inserted into the third opening 28 of the support member 20a.

The upper frame member 30a, the upper frame member 30b, and the support member 20a are joined by inserting the upper frame member 30a and the upper frame member 30b into the first opening 26 of the support member 20a until the lower wall 31d of the upper frame member 30a contacts the lower end of the opening edge of the second opening 27 and the lower wall 36d of the upper frame member 30b contacts the lower end of the opening edge of the third opening 28.
When the upper frame member 30a, the upper frame member 30b, and the support member 20a are joined together, the portion where the upper frame member 30a and the upper frame member 30b are joined is located within the first opening 26. Also, when the upper frame member 30a, the upper frame member 30b, and the support member 20a are joined together, the upper frame member 30a passes through the second opening 27, and the upper frame member 30b passes through the third opening 28.

In this manner, by joining the upper frame member 30a, the upper frame member 30b, and the support member 20a, the strength of the joint structure can be improved.
Specifically, when a force is applied to the upper frame member 30a in the longitudinal direction toward the support member 20a, the end face of the upper frame member 30a abuts against the side wall 21b of the support member 20a, and the side wall 36a of the upper frame member 30b abuts against the side wall 21b side of the opening edge of the third opening 28. In addition, the opening edge of the fourth opening 32 of the upper frame member 30a abuts against the side wall 36b of the upper frame member 30b, and the tongue portion 34 of the upper frame member 30a abuts against the side wall 36a from inside the upper frame member 30b.
Conversely, when a force is applied to the upper frame member 30a in the longitudinal direction toward the opposite side to the support member 20a, the side wall 36b of the upper frame member 30b abuts against the side wall 21d side of the opening edge of the third opening 28. Also, the opening edge of the fourth opening 32 of the upper frame member 30a abuts against the side wall 36a of the upper frame member 30b, or the tongue portion 34 of the upper frame member 30a abuts against the side wall 36b from inside the upper frame member 30b.

On the other hand, when a force is applied to the upper frame member 30b in the longitudinal direction toward the support member 20a, the end face of the upper frame member 30b abuts against the side wall 21a of the support member 20a, or the side wall 31a of the upper frame member 30a abuts against the side wall 21a side of the opening edge of the second opening 27. In addition, the opening edge of the fifth opening 37 of the upper frame member 30b abuts against the side wall 31b of the upper frame member 30a, or the tongue portion 39 of the upper frame member 30b abuts against the side wall 31a from inside the upper frame member 30a.
Conversely, when a force is applied to the upper frame member 30b in the longitudinal direction in the direction opposite to the support member 20a, the side wall 31b of the upper frame member 30a abuts against the side wall 21c side of the opening edge of the second opening 27. Also, the opening edge of the fifth opening 37 of the upper frame member 30b abuts against the side wall 31a of the upper frame member 30a, or the tongue portion 39 of the upper frame member 30b abuts against the side wall 31b from inside the upper frame member 30a.

In this way, even when force is applied to the upper frame member 30a and the upper frame member 30b, the force is not concentrated locally but is dispersed, thereby improving the strength of the joint structure. Note that when force is applied to the upper frame member 30a and the upper frame member 30b, it is not limited to the case where all of the above-mentioned abutments occur, and some of the abutments may not occur.

Here, we have described the case of joining upper frame member 30a, upper frame member 30b, and support member 20a, but by joining other parts in the same manner, it is possible to join upper frame members 30a to 30d and support members 20a to 20d, and to join lower frame members 40a to 40d and support members 20a to 20d.
The state in which the lower frame members 40a to 40d and the support members 20a to 20d are joined is similar to the state in which the upper frame members 30a to 30d and the support members 20a to 20d are joined but turned upside down.

In this embodiment, the upper frame members 30a, 30c (lower frame members 40a, 40c) are described as being longer than the upper frame members 30b, 30d (lower frame members 40b, 40d). However, the upper frame members 30b, 30d (lower frame members 40b, 40d) may be longer than the upper frame members 30a, 30c (lower frame members 40a, 40c) or may be approximately the same length.
In the present embodiment, the case where the joining structure of members is applied to the structure 10 serving as a framework of a container has been described, but the present invention is not limited to this case and may be applied to any structure, for example, a framework of a table, a counter, a cart, etc.

Second Embodiment
5 is a perspective view showing an example of the structure 11. Note that the description of the same configuration as in the first embodiment will be omitted as appropriate.
The structure 11 of this embodiment is used as a frame of a table or the like. The structure 11 is configured into a pentagonal prism shape by joining a plurality of frames. The structure 11 of this embodiment has a substantially regular pentagonal shape in a plan view.

The structure 11 has five support members 120a to 120e, five upper frame members 130a to 130e, and five lower frame members 140a to 140e.
The support members 120a to 120e are long or rod-shaped members extending in the vertical direction. The support members 120a to 120e have a hollow, generally circular cross-sectional shape when cut in a direction perpendicular to the longitudinal direction. However, the shape and material of the support members 120a to 120e are not particularly limited.
The upper and lower ends of the support members 120a to 120e are each processed as described below, and the same material including the processing can be used.

The upper frame members 130a to 130e are elongated or rod-shaped members extending along the horizontal direction. The upper frame members 130a to 130e have approximately the same length. The upper frame members 130a to 130e have a cross-sectional shape cut in a direction perpendicular to the longitudinal direction that is approximately a hollow rectangle. Both ends of the upper frame members 130a to 130e of this embodiment are arc-shaped and convex outward in a plan view. The radius of curvature of the arcs at both ends of the upper frame members 130a to 130e is approximately the same as the radius of curvature of the inner circumferential surface of a first opening 126 (described later) of the support members 120a to 120e.
However, the shape and material of the upper frame members 130a to 130e are not particularly limited.
Both ends of the upper frame members 130a to 130e are processed as described below. The upper frame members 130a to 130e may be made of the same material including the processing.
The lower frame members 140a to 140e have the same configuration as the upper frame members 130a to 130e, and therefore a description thereof will be omitted.

FIG. 6 is a perspective view showing the state before the support member 120a and the upper frame members 130a and 130b are joined together.
The upper end of the support member 120a has a first opening 126 that opens in the longitudinal direction of the support member 120a, and a second opening 127 and a third opening 128 that open in a direction perpendicular to the longitudinal direction.

The upper frame member 130a has two opposing side walls 131a, 131b, an upper wall 131c, and a lower wall 131d. In addition, the end of the upper frame member 130a facing the support member 120a has a fourth opening 132 that opens in a direction perpendicular to the longitudinal direction of the upper frame member 130a.

The fourth opening 132 is an opening formed in the upper wall 131c. In a plan view, the fourth opening 132 is substantially a parallelogram. Specifically, the two edges of the fourth opening 132 that are located on the upper wall 131c are not perpendicular to the longitudinal direction of the upper frame member 130a, but are inclined at approximately 72° (see the inclination angle α shown in FIG. 6).

In addition, the upper frame member 130a has a pair of slits 133 on each of the side walls 131a and 131b on both sides of the fourth opening 132. The slits 133 are formed at positions where the four corners of the fourth opening 132 are extended toward the lower wall 131d. The pair of slits 133 formed in the side wall 131a and the pair of slits 133 formed in the side wall 131b are not positioned perpendicular to the longitudinal direction of the upper frame member 130a, but are positioned obliquely to the longitudinal direction of the upper frame member 130a. Specifically, the pair of slits 133 formed in the side wall 131a are positioned closer to the end face of the upper frame member 30a than the pair of slits 133 formed in the side wall 131b. A tongue portion 134 is formed between the two slits 133.

The upper frame member 130a has an approximately identical opening formed in the lower wall 131d of the end on the support member 120e side, and is given the same reference numerals as the fourth opening 132 and slit 133 described above. In other words, approximately the same processing can be performed on both ends of the upper frame member 130a by inverting the top and bottom, thereby reducing processing costs.

The upper frame member 130b has two opposing side walls 136a, 136b, an upper wall 136c, and a lower wall 136d. The end of the upper frame member 130b facing the support member 120a has a fifth opening 137 that opens in a direction perpendicular to the longitudinal direction of the upper frame member 130b.

The fifth opening 137 is an opening formed in the lower wall 136d. When viewed from the bottom, the fifth opening 137 is a substantially parallelogram. In addition, the upper frame member 130b has a pair of slits 138 provided in each of the side walls 136a, 136b on both sides of the fifth opening 137. A tongue portion 139 is formed between the two slits 138.
Here, the fifth opening 137, slit 138, and tongue portion 139 of the upper frame member 130b have approximately the same shapes as the fourth opening 132, slit 133, and tongue portion 134 when the upper frame member 130a is inverted upside down, and detailed explanation is omitted.

The upper frame member 130b has an approximately identical opening formed in the upper wall 136c of the end on the support member 120b side, and is given the same reference numerals as the fifth opening 137 and slit 138 described above. In other words, approximately the same processing can be performed on both ends of the upper frame member 130b by inverting the top and bottom, thereby reducing processing costs.

To join the support member 120a, the upper frame member 130a, and the upper frame member 130b, they can be joined in the same manner as in the first embodiment, and by joining other parts in the same manner, it is possible to join the upper frame members 130a-130e and the support members 120a-120e, and to join the lower frame members 140a-140e and the support members 120a-120e.
The state in which the lower frame members 140a to 140e and the support members 120a to 120e are joined is the same as the state in which the upper frame members 130a to 130e and the support members 120a to 120e are joined but turned upside down.

In this embodiment as well, when force is applied to the upper frame members 130a and 130b, the force is not concentrated locally but is dispersed, thereby improving the strength of the joint structure.
Furthermore, in this embodiment, the upper frame members 130a to 120e can be made of the same material, including the processing required.
Furthermore, in this embodiment, the lower frame members 140a to 140e can be made of the same material, including the processing required.
Furthermore, in this embodiment, the upper frame members 130a to 120e and the lower frame members 140a to 140e can be made of the same materials, including the processing required.

Third Embodiment
7 is a perspective view showing an example of the structure 12. Note that the description of the same configuration as in the first or second embodiment will be omitted as appropriate, and the description will focus on the points different from the second embodiment.
The structure 12 of this embodiment is used as a frame of a table or the like. The structure 12 is formed into a hexagonal prism shape by joining a plurality of frames. The structure 12 of this embodiment has a substantially regular hexagonal shape in a plan view.

The structure 12 has six support members 220a-220f, six upper frame members 230a-230f, six lower frame members 240a-240f, and reinforcing frame members 250a-250b.

The support members 220a to 220f are elongated or rod-shaped members extending in the vertical direction and have the same configuration as the support members 120a to 120e of the second embodiment.
The upper frame members 230a to 230f are elongated or rod-shaped members extending in the horizontal direction and have the same configuration as the upper frame members 130a to 130e of the second embodiment.

The lower frame members 240a to 240f have the same configuration as the upper frame members 230a to 230f, and so a description thereof will be omitted.
Reinforcing frame member 250a is disposed across support member 220a and support member 220d, and reinforcing frame member 250b is disposed across support member 220b and support member 220e.

FIG. 8 is a perspective view showing the state before the support member 220a and the upper frame members 230a and 230b are joined together.
The upper end of the support member 220a has a first opening 226 that opens in the longitudinal direction of the support member 220a, and a second opening 227 and a third opening 228 that open in a direction perpendicular to the longitudinal direction.

The upper frame member 230a has a fourth opening 232 that opens in a direction perpendicular to the longitudinal direction of the upper frame member 230a at the end of the upper wall on the support member 220a side, a pair of slits 233 provided in the side walls on both sides of the fourth opening 232, and a tongue portion 234. Two sides of the opening edge of the fourth opening 232 that are located on the upper wall are not perpendicular to the longitudinal direction of the upper frame member 230a, and are inclined at approximately 60° (see the inclination angle β shown in Figure 8).

The upper frame member 230a has an approximately identical opening formed in the lower wall of the end on the support member 220f side, and is given the same reference numerals as the fourth opening 232 and slit 233 described above. In other words, approximately the same processing can be performed on both ends of the upper frame member 230a by inverting the top and bottom, thereby reducing processing costs.

The upper frame member 230b has a fifth opening 237 that opens at the end of the lower wall on the support member 220a side in a direction perpendicular to the longitudinal direction of the upper frame member 230b, and a pair of slits 238 and tongue portion 239 provided in the side walls on both sides of the fifth opening 237. The fifth opening 237, slit 238, and tongue portion 239 of the upper frame member 230b have substantially the same shapes as the fourth opening 232, slit 233, and tongue portion 234 when the upper frame member 230a is turned upside down, and detailed description will be omitted.

The support member 220a, the upper frame member 230a, and the upper frame member 230b can be joined in the same manner as in the first embodiment, and by joining other parts in the same manner, the upper frame members 230a-230f can be joined to the support members 220a-220f, and the lower frame members 240a-240f can be joined to the support members 220a-220f.

The state in which the lower frame members 240a to 240f and the support members 220a to 220f are joined is the same as the state in which the upper frame members 230a to 230f and the support members 220a to 220f are joined but turned upside down.

In this embodiment as well, when force is applied to the upper frame members 230a and 230b, the force is not concentrated locally but is dispersed, thereby improving the strength of the joint structure.
Furthermore, in this embodiment, the upper frame members 230a to 220f can be made of the same material, including the processing required.
Furthermore, in this embodiment, the lower frame members 240a to 240f can be made of the same material, including the processing required.
Furthermore, in this embodiment, the upper frame members 230a to 220f and the lower frame members 240a to 240f can be made of the same material, including the processing required.

The present invention has been described above using the above-mentioned embodiments and examples, but the present invention is not limited to the above-mentioned embodiments and examples, and modifications and the like are possible within the scope of the present invention, and a portion of the configuration of each embodiment or modification may be combined with other embodiments or modifications as appropriate.
In the above embodiment, the members are joined by fitting them together. However, the joint may be reinforced by adding screws or nuts, or by welding.

In the above-described embodiment, the case where the member joining structure is used for the structures 10, 11, and 12 has been described, but the present invention is not limited to this case and may be used for anything as long as it is for joining members.
In the above-described embodiment, the structures 10, 11, and 12 are described as being used as frames for containers and tables, but they can also be used in glamping facilities, hotels, chairs, shelves, interior decorations, and the like.

10, 11, 12: Structure 20a, 120a, 220a: Support member (first member) 26, 126, 226: First opening 27, 127, 227: Second opening 28, 128, 228: Third opening 30a, 130a, 230a: Upper frame member (second member) 32, 132, 232: Fourth opening 33, 133, 233: Slit 30b, 130b, 230b: Upper frame member (third member) 37, 137, 237: Fifth opening 38, 138, 238: Slit

Claims (6)

A joining structure for joining a first elongated member, a second elongated member, and a third elongated member,
the first member has a hollow, generally circular cross-sectional shape when cut in a direction perpendicular to the longitudinal direction, and has a first opening that opens in the longitudinal direction, and a second opening and a third opening that open in a direction perpendicular to the longitudinal direction;
the second member has a cross-sectional shape cut in a direction perpendicular to the longitudinal direction and is generally rectangular and hollow; a fourth opening having a generally parallelogram shape that opens in a direction perpendicular to the longitudinal direction at one end of the second member; and a pair of slits provided in side walls on both sides of the fourth opening,
the third member has a cross-sectional shape cut in a direction perpendicular to the longitudinal direction and is generally hollow and rectangular, and has a fifth opening having a generally parallelogram shape that opens in a direction perpendicular to the longitudinal direction at one end in the longitudinal direction, and a pair of slits provided in side walls on both sides of the fifth opening,
The second member and the third member are
A pair of slits provided on one side wall of the second member are fitted to one of a pair of slits provided on one side wall of the third member and one of a pair of slits provided on the other side wall of the third member, and
a portion where a pair of slits provided in the other side wall of the second member, the other of the pair of slits provided in the one side wall of the third member, and the other of the pair of slits provided in the other side wall of the third member are fitted together is located within the first opening,
one of the second member and the third member is inserted through the second opening, and the other of the second member and the third member is inserted through the third opening ;
a pair of slits provided in one side wall sandwiching the fourth opening and a pair of slits provided in the other side wall sandwiching the fourth opening are positioned obliquely with respect to a longitudinal direction of the second member,
a pair of slits provided in one side wall sandwiching the fifth opening and a pair of slits provided in the other side wall sandwiching the fifth opening are positioned obliquely with respect to a longitudinal direction of the third member,
The end of the second member on the one end side is formed in an outwardly convex arc shape having a radius of curvature substantially equal to the radius of curvature of the inner circumferential surface of the first opening,
A joining structure of members, characterized in that the end of the third member on the one end side is formed into an outwardly convex arc shape with a radius of curvature approximately equal to the inner surface of the first opening . The fourth opening and the fifth opening have approximately the same opening width,
The joining structure of members as described in claim 1, characterized in that a pair of slits provided on each of the side walls on both sides of the fourth opening and a pair of slits provided on each of the side walls on both sides of the fifth opening each have approximately the same slit width. a slit width of the slit provided in the side wall of the second member is greater than a plate thickness of the side wall of the third member,
3. The joining structure of members according to claim 2, wherein a width of the slit provided in the side wall of the third member is greater than a plate thickness of the side wall of the second member. The joining structure of members as described in claim 2, characterized in that the distance from the end of the second member on the one end side to the fourth opening and the distance from the end of the third member on the one end side to the fifth opening are approximately the same. the second member has a sixth opening having a substantially parallelogram shape that opens in a direction perpendicular to the longitudinal direction at the other end of the second member in the longitudinal direction, and a pair of slits that are provided in both side walls that sandwich the sixth opening,
the third member has a seventh opening having a substantially parallelogram shape that opens in a direction perpendicular to the longitudinal direction at the other end of the third member in the longitudinal direction, and a pair of slits that are provided in both side walls that sandwich the seventh opening,
an opening direction of the fourth opening and an opening direction of the sixth opening are opposite to each other,
2. The joining structure of members according to claim 1, wherein an opening direction of the fifth opening and an opening direction of the seventh opening are opposite to each other. A structure formed by the joining structure of members according to any one of claims 1 to 5 .

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