Joining member and skeleton structure

Abstract

The invention provides a joint member and a skeleton structure. The joint member can improve the joint strength of tubular members. The joining members are provided with a first joining member (10A), a second joining member (20), and a fixing member (50). The first joining member (10A) is provided with a corner tube-shaped corner tube section (11). A pair of first insertion pieces (12) and a pair of first insertion pieces (13) extending in the X direction and the Y direction, respectively, from the corner tube section (11); and a fixing slit (14) through which the fixing member (50) penetrates each of a pair of side surfaces facing each other in the corner tube section (11). The second joining member (20) is provided with a flat surface section (21). A pair of second insertion pieces (22) extending from the flat surface section (21); a pair of connecting insertion pieces (23) extending from the flat surface section (21) to the opposite side of the second insertion piece (22) and inserted into the corner tube section (11); and a fixing member holding section (28) provided on the pair of coupling insertion pieces (23) in order to hold the fixing member (50).

Description

Technical Field

[0001] The present invention relates to a joining member for joining tubular members and a skeleton structure constructed by joining tubular members with the joining member. Background Art

[0002] As a joint member for joining tubular members such as corner tubes to construct a skeleton structure, the inventors of the present application proposed a joint member manufactured by metal extrusion molding, the joint member having a plurality of insertion pieces for fitting the tubular members outside (Patent Document 1).

[0003] In patent document 1, in the case of constructing a three-dimensional skeleton structure, a first joining member and a second joining member are used as joining members. In detail, the first joining member has a base and a first insertion piece, the base is a solid cube, and has a hole portion penetrating in the extrusion direction as the Z direction; the first insertion piece extends from the side of the base to the X direction and the Y direction orthogonal to the Z direction. By inserting the first insertion piece of the first joining member into the end of the tubular member, a two-dimensional frame-shaped skeleton structure in the XY direction can be constructed. In addition, the second joining member has a protrusion extending from the plane portion of the square and a second insertion piece extending from the surface on the opposite side of the protrusion in the plane portion. Moreover, by embedding the protrusion of the second joining member into the hole portion of the first joining member and inserting the second insertion piece into the end of the tubular member, the tubular member can be erected at right angles relative to the two-dimensional frame-shaped skeleton structure to construct a three-dimensional frame-shaped skeleton structure.

[0004] According to the technology of Patent Document 1, since the first and second joining members (joining members) can be formed from an extruded body on the basis of a tubular member, the tubular member and the joining member can be formed from a metal material of the same composition. Thus, by using these joining members, a skeleton structure can be constructed without the risk of strain due to a difference in thermal expansion coefficient.

[0005] However, in the technology of Patent Document 1, it is difficult to obtain sufficient joining strength because the first joining member and the second joining member are joined by fitting the protrusion into the hole. Therefore, it is possible to consider welding the first joining member and the second joining member, but there are the following problems: welding operation takes time and labor, and the environment in which the operation can be performed is limited.

[0006] [Prior technical literature]

[0007] [Patent Literature]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 2021-178330 Summary of the invention

[0009] [Problems to be solved by the invention]

[0010] Therefore, in view of the above-mentioned actual situation, the present invention aims to provide a joining member capable of improving the joining strength between tubular members and a skeleton structure constructed by joining tubular members with the joining member.

[0011]

Means for solving the problem

[0012] In order to solve the above-mentioned problems, a joining member according to the present invention includes a first joining member, a second joining member and a fixing member, and is characterized in that:

[0013] The first joint member comprises a square tube portion, a pair of first insertion pieces and a fixing slit.

[0014] The corner tube part is in the shape of a rectangular parallelepiped or a cube;

[0015] The pair of first insertion pieces extend in the X direction or the Y direction orthogonal to the Z direction at a position inside a pair of side edges extending in the Z direction at a predetermined interval from each side edge of the pair of side edges extending in the Z direction, on each of at least two side edges of the square tube portion that are parallel to the Z direction as the axial direction;

[0016] The fixing slit penetrates each of a pair of opposing side surfaces in the above-mentioned square tube portion in the thickness direction, and the above-mentioned fixing member is inserted therein.

[0017] The second joining member includes a flat surface portion, a pair of second insertion pieces, a pair of connecting insertion pieces, and a fixing member holding portion.

[0018] The plane portion is a square or rectangular plane portion;

[0019] The pair of second insertion pieces extend from the planar portion at right angles along each of a pair of side edges on one surface of the planar portion;

[0020] The pair of connecting insert pieces extend from the plane portion at right angles along each of a pair of side edges on the surface of the plane portion opposite to the surface from which the second insert piece extends, and are inserted into the angle tube portion;

[0021] The fixing member holding portion is provided on each of the pair of connecting insertion pieces and is used to hold the fixing member between each other.

[0022] According to the joining member of this structure, after inserting a pair of connecting insertion pieces into the angle tube portion, the first joining member and the second joining member can be joined by inserting the fixing member into the fixing slit and holding the fixing member in the fixing member holding portion provided on the pair of connecting insertion pieces. By joining the second joining member to the first joining member, the pair of second insertion pieces extending from the plane portion of the second joining member are in a state of extending in the Z direction. Furthermore, by embedding each pair of two or more pairs of first insertion pieces and a pair of second insertion pieces relatively into the end of the tubular member, at least two tubular members with the axial direction in the X direction or the Y direction and one tubular member with the axial direction in the Z direction can be joined.

[0023] In this joining member, since the fixing member inserted into the fixing slit provided on the side of the angle tube portion is held in the fixing member holding portion, the relative movement of the second joining member in the axial direction with respect to the angle tube portion is prevented, and the first joining member and the second joining member are mechanically joined. Thus, compared with the prior art in which two joining members are joined by embedding the protrusion into the hole portion, the joining strength of the first joining member and the second joining member can be improved. That is, the joining strength of a tubular member whose axial direction is the X direction or the Y direction and a tubular member whose axial direction is the Z direction can be improved. Furthermore, since the joining strength of the first joining member and the second joining member can be improved, unlike the prior art, welding work for joining the two joining members can be eliminated.

[0024] The skeleton structure of the present invention is a skeleton structure constructed by connecting a tubular member as an angle tube with a joint member including a first joint member, a second joint member and a fixing member, and is characterized in that:

[0025] The first joint member comprises a square tube portion, a pair of first insertion pieces and a fixing slit.

[0026] The corner tube part is in the shape of a rectangular parallelepiped or a cube;

[0027] The pair of first insertion pieces extend in the X direction or the Y direction orthogonal to the Z direction at a position inside a pair of side edges extending in the Z direction at a predetermined interval from each side edge of the pair of side edges extending in the Z direction, on each of at least two side edges of the square tube portion that are parallel to the Z direction as the axial direction;

[0028] The fixing slit penetrates each of a pair of opposing side surfaces in the above-mentioned square tube portion in the thickness direction, and the above-mentioned fixing member is inserted therein.

[0029] The second joining member includes a flat surface portion, a pair of second insertion pieces, a pair of connecting insertion pieces, and a fixing member holding portion.

[0030] The plane portion is a square or rectangular plane portion;

[0031] The pair of second insertion pieces extend from the planar portion at right angles along each of a pair of side edges on one surface of the planar portion;

[0032] The pair of connecting insert pieces extend from the plane portion at right angles along each of a pair of side edges on the surface of the plane portion opposite to the surface from which the second insert piece extends, and are inserted into the angle tube portion;

[0033] The fixing member holding portion is provided on each of the pair of connecting insertion pieces and is used to hold the fixing members between each other.

[0034] The second joining member is fixed to the first joining member by inserting the pair of connecting insertion pieces into the angled tube portion and holding the fixing member inserted into the fixing slit in the fixing member holding portion.

[0035] The plurality of tubular members are joined by inserting the pair of first insertion pieces and the pair of second insertion pieces into end portions of different tubular members, respectively.

[0036] This is a structure of a three-dimensional frame-shaped skeleton structure constructed by joining tubular members using a joining member having the above-mentioned first joining member, second joining member and fixing member. Thus, a skeleton structure having a higher joining strength between tubular members than before can be provided. In addition, since the skeleton structure is constructed by embedding the members, welding work is not required, and the skeleton structure can be constructed even in an environment where welding work is difficult.

[0037] [Effects of the Invention]

[0038] As described above, according to the present invention, it is possible to provide a joining member capable of improving the joining strength between tubular members and a skeleton structure constructed by joining tubular members using the joining member. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 (a) is a top view of the L-shaped first joining member, Figure 1 (b) is a front view of the L-shaped first joining member, Figure 1 (c) is a stereoscopic view of the L-shaped first joining member, and Figure 1 (d) is a diagram illustrating a method for manufacturing an L-shaped first joining member from a first extruded body.

[0040] Figure 2 (a) is a front view of the second joining member, Figure 2 (b) is a right view of the second joining member, Figure 2 (c) is a stereoscopic view of the second joining member, Figure 2 (d) is a figure illustrating a method for manufacturing the second joining member from a second extruded body, and Figure 2 (e) is a figure illustrating a method for manufacturing the second joining member following Figure 2 (d).

[0041] Figure 3 (a) is a front view of the third joining member, Figure 3 (b) is a right view of the third joining member, Figure 3 (c) is a stereoscopic view of the third joining member, Figure 3 (d) is a figure illustrating a method for manufacturing the third joining member from a third extruded body, and Figure 3 (e) is a figure that follows Figure 3 (d) to illustrate a method for manufacturing the third joining member.

[0042] Figure 4 It is a three-dimensional diagram of the fixed component.

[0043] Figure 5 It is a three-dimensional diagram of a wedge member.

[0044] Figure 6 It is an exploded perspective view of a three-dimensional frame-like skeleton structure.

[0045] Figure 7 Yes Figure 6 A partial stereoscopic view showing an enlarged portion of the part viewed in the direction of arrow A.

[0046] Figure 8(a) is Figure 7 FIG8(b) is a cross-sectional view of the angular tube portion cut at a plane perpendicular to the Y direction in the center of the angular tube portion. Figure 7 A cross-sectional view taken along a plane perpendicular to the Z direction at the center of the fixing member.

[0047] Fig. 9 Yes Figure 7 An exploded perspective view showing each component.

[0048] FIG. 10( a ) is a plan view of a first T-shaped bonding member, and FIG. 10( b ) is a perspective view of the first T-shaped bonding member.

[0049] FIG. 11( a ) is a plan view of a cross-shaped first bonding member, and FIG. 11( b ) is a perspective view of the cross-shaped first bonding member.

[0050] Figure 12 (a) is an exploded stereoscopic view of a joining member having a first joining member and two second joining members, Figure 12 (b) is a stereoscopic view of the joining member of Figure 12 (a) in an assembled state, and Figure 12 (c) is a sectional view of the joining member of Figure 12 (b) cut along a plane orthogonal to the Y direction at the center of the angle tube portion.

[0051] Figure 13 (a) is an exploded stereoscopic view of a joining member used in a two-dimensional frame-shaped skeleton structure, Figure 13 (b) is a stereoscopic view of the joining member of Figure 13 (a) in an assembled state, and Figure 13 (c) is a sectional view of the joining member of Figure 13 (b) cut along a plane orthogonal to the Y direction at the center of the corner tube portion. DETAILED DESCRIPTION

[0052] Modes for carrying out the invention

[0053] Hereinafter, a plurality of types of joining members, a skeleton structure constructed using these joining members, and a method for producing these joining members will be described as specific embodiments of the present invention using the drawings.

[0054] The skeleton structure of this embodiment is constructed by joining a tubular member 70 with a joining member. The tubular member 70 is an angular tube as an extruded body, and the outer shape of the cross section perpendicular to the axial direction (hereinafter referred to as the "orthogonal cross section") is a square. Here, the length of one side of the square as the outer shape of the orthogonal cross section is L, and the wall thickness of the tubular member 70 is d (refer to Figure 8 (a)). Therefore, the length of one side of the square as the inner shape of the orthogonal cross section in the tubular member 70 is L-2d.

[0055] The tubular member 70 has slits 75 near each of the two end portions, each of which penetrates two parallel side surfaces among the four side surfaces in the thickness direction (see Fig. 9 The slit 75 extends in a direction perpendicular to the axial direction of the tubular member 70, but does not penetrate the side surface in this direction. Such a slit 75 is manufactured by performing a hole-forming process on the tubular member as an extruded body.

[0056] In this embodiment, the first bonding member, the second bonding member 20 and the third bonding member 40 are used as bonding members. Furthermore, a fixing member 50 for fixing the first bonding member and the second bonding member 20 and a reinforcing wedge member 60 for bonding are used to construct the skeleton structure.

[0057] In the present embodiment, there are three types of first joining members. When distinguishing between them, they are referred to as L-shaped first joining members 10A (refer to FIG. 1 (a)), T-shaped first joining members 10B (refer to FIG. 10 (a)), and cross-shaped first joining members 10C (refer to FIG. 11). When there is no need to distinguish them, they are simply collectively referred to as first joining members. In addition, the details will be described later, but any type of first joining member has a type in which one fixed slit 14 is provided on each of the two parallel side surfaces of the angle tube portion 11, and a type in which two fixed slits 14 are provided (refer to FIG. 12 (a)). Therefore, there are six types of first joining members in total. In addition, when distinguishing between types with different numbers of fixed slits 14, the type in which one fixed slit 14 is provided is assigned the same symbol as above, and the type in which two fixed slits 14 are provided is referred to as L-shaped first joining member 10A', T-shaped first joining member 10B', and cross-shaped first joining member 10C'.

[0058] All types of first bonding members include the angular tube-shaped rectangular tube portion 11. Here, in the first bonding member, the axial direction of the rectangular tube portion 11 is referred to as the Z direction, and two directions orthogonal to the Z direction are referred to as the X direction and the Y direction.

[0059] The first joining member, in addition to the angle tube portion 11, also includes a pair or two pairs of first insertion pieces 12, a pair or two pairs of first insertion pieces 13 and a fixing slit 14. The first insertion pieces 12 and 13 are each composed of a pair of members extending in the same direction from one of the four side surfaces of the angle tube portion 11. The pair of first insertion pieces 12 extend in the X direction from a position that is only away from the inner side of a pair of side edges extending in the Z direction in the side surface of the angle tube portion 11 by a predetermined interval. The pair of first insertion pieces 13 extend in the Y direction from a position that is only away from the inner side of a pair of side edges extending in the Z direction in the side surface of the angle tube portion 11 by a predetermined interval. The fixing slit 14 penetrates two parallel side surfaces of the angle tube portion 11 in the thickness direction. The L-shaped first joining member 10A includes a pair of first insertion pieces 12 and a pair of first insertion pieces 13. The T-shaped first joining member 10B includes a pair of the first insertion pieces 12 and the first insertion pieces 13 on one side and two pairs on the other side. The cross-shaped first joint member 10C includes two pairs of first insertion pieces 12 and two pairs of first insertion pieces 13 .

[0060] The outer shape and inner shape of the square tube portion 11 of the first joint member as viewed in the Z direction are both squares. The length of one side of the square as the outer shape is L. In addition, if the wall thickness of the square tube portion 11 is d' (refer to Figure 8 (a)), the length of one side of the square as the inner shape is L-2d'. The wall thickness d' of this square tube portion 11 is thicker than the wall thickness d of the tubular member 70. Therefore, the outer shape of the square tube portion 11 as viewed in the Z direction is the same size as the outer shape of the orthogonal section of the tubular member 70, and on the other hand, the inner shape of the square tube portion 11 as viewed in the Z direction is smaller than the inner shape of the orthogonal section of the tubular member 70.

[0061] The first insertion pieces 12 and 13 in the first joint member extend from a pair of side edges extending in the Z direction of the square tube portion 11 “just inside a predetermined distance”. This “predetermined distance” is set to be substantially equal to the wall thickness d of the tubular member 70 .

[0062] The fixing slit 14 in the first joint member is formed into a long hole shape that is long in a direction orthogonal to the Z direction along the side surface of the square tube portion 11. The fixing slits 14 provided on the two parallel side surfaces of the square tube portion 11 are provided at the same positions in the Z direction, respectively, and are provided at positions that are biased to one side relative to the center in the Z direction in the square tube portion 11. The fixing member 50 is inserted (embedded) into this fixing slit 14. The widths in the Z direction of the two fixing slits 14 provided on the parallel side surfaces are different, one of which is the same as the thickness of the flat plate portion 51 described later in the fixing member 50, and the other is the same as the thickness of the head portion 52 in the fixing member 50.

[0063] The first joint member is provided with a wedge retaining portion 15 for retaining the wedge member 60 between the paired counterpart members in the pair of first insertion pieces 12 and the pair of first insertion pieces 13. In detail, the first joint member is provided with two inner protrusions 16 protruding toward the counterpart member in the inner surfaces facing each other of the pair of first insertion pieces 12 and the pair of first insertion pieces 13. The inner protrusions 16 are formed over the entire length of each of the first insertion pieces 12 and 13 in the Z direction. The positions of the inner protrusions 16 in the first insertion pieces 12 and 13 are set in such a manner that the inner protrusions 16 provided on the insertion piece of one of the pair and the inner protrusions 16 provided on the insertion piece of the other of the pair face each other. In addition, the inner surface of each of the first insertion pieces 12 and 13 is recessed between the two inner protrusions 16 compared to other parts. The wedge retaining portion 15 as a gap for inserting and retaining the wedge member 60 is formed between the pair of first insertion pieces 12 and the pair of first insertion pieces 13 by such four inner protrusions 16. The distance from the angled tube portion 11 to the center of the wedge holding portion 15 is the same as the distance from the end portion to the center of the slit 75 in the tubular member 70 .

[0064] In addition, the first joining member includes an inclined protrusion 17 provided near the front end of each outer surface of the pair of first insertion pieces 12 and the pair of first insertion pieces 13, and a plurality of outer protrusions 18 provided on each outer surface of the pair of first insertion pieces 12 and the pair of first insertion pieces 13. The inclined protrusion 17 is provided in a manner inclined outward from each front end toward the angle tube portion 11 on the front end side compared with the wedge retaining portion 15 in the outer surface of each of the first insertion pieces 12 and 13. The plurality of outer protrusions 18 each protrude outward from each outer surface of the first insertion pieces 12 and 13 on the angle tube portion 11 side compared with the wedge retaining portion 15. The direction in which the plurality of outer protrusions 18 are continuously provided is the direction in which each of the first insertion pieces 12 and 13 extends. These inclined protrusions 17 and outer protrusions 18 are formed over the entire length of each of the first insertion pieces 12 and 13 in the Z direction.

[0065] All types of first joining members 10A, 10B, 10C are manufactured by an extrusion step of obtaining a metal extruded body, a cutting step of cutting the extruded body along a plane perpendicular to the extrusion direction, and a cutting step of cutting off a predetermined portion of the cut body obtained by the cutting step.

[0066] In the L-shaped first joint member 10A, as shown in FIG. 1( d ), a pair of first insertion pieces 12 extend from one of the four side surfaces of the square tube portion 11 in the X direction, and a pair of first insertion pieces 13 extend from adjacent side surfaces in the Y direction.

[0067] This L-shaped first joint member 10A is manufactured by cutting a first extruded body EB1 (see FIG. 1(d)) extending in the Z direction (extrusion direction) as a certain cross-sectional shape when viewed from above as shown in FIG. 1(a) by a plane orthogonal to the Z direction (XY plane, i.e., a plane indicated by a dashed line in FIG. 1(d)) so as to form a fixed slit 14 in two parallel side surfaces of the square tube portion 11. In the cutting step, the first extruded body EB1 is cut at a position of a distance L-2d in the Z direction from the end portion thereof.

[0068] The second joining member 20 of the present embodiment includes a flat and square plane portion 21, a pair of second insertion pieces 22, and a pair of connecting insertion pieces 23. The pair of second insertion pieces 22 extend at right angles to the plane portion 21 from positions that are separated from a pair of parallel side edges by a predetermined interval on one surface of the plane portion 21. The pair of connecting insertion pieces 23 extend at right angles to the plane portion 21 from positions that are separated from a pair of side edges by a second predetermined interval on the surface of the plane portion 21 opposite to the surface from which the second insertion pieces 22 extend.

[0069] The length of one side of the square of the plane portion 21 as the outer shape is L, and the thickness is d which is the same as the wall thickness of the tubular member 70. A pair of second insertion pieces 22 are arranged at a position just inside a prescribed interval from each of a pair of side edges in the plane portion 21. This "prescribed interval" is set to be substantially equal to the wall thickness d of the tubular member 70, similar to the "prescribed interval" of a pair of first insertion pieces 12 and a pair of first insertion pieces 13 in the first joining member. On the other hand, a pair of connecting insertion pieces 23 are arranged at a position just inside a second prescribed interval from each of a pair of side edges in the plane portion 21. This "second prescribed interval" is set to be substantially equal to the wall thickness d' of the angle tube portion 11 in the first joining member. A pair of side edges of the pair of connecting insertion pieces 23 just outside the second prescribed interval are the same as a pair of side edges of the pair of second insertion pieces 22 just outside the prescribed interval. In addition, the lengths of the pair of connecting insertion pieces 23 extending from the plane portion 21 are different.

[0070] The second joint member 20 is provided with a wedge holding portion 24 for holding the wedge member 60 between the pair of second insertion pieces 22, similarly to the first insertion pieces 12 and 13 of the first joint member. The wedge holding portion 24 of the second joint member 20 is formed of four inner protrusions 25. The inner protrusions 25 are similar in structure to the inner protrusions 16 forming the wedge holding portion 15 in the first insertion pieces 12 and 13.

[0071] In addition, the second joining member 20 includes an inclined protrusion 26 provided near the front end of each outer surface of the pair of second insertion pieces 22 and a plurality of outer protrusions 27 provided on each outer surface of the pair of second insertion pieces 22. The inclined protrusion 26 and the outer protrusion 27 are respectively the same structures as the inclined protrusion 17 and the outer protrusion 18 of the first joining member.

[0072] Furthermore, the second joining member 20 is provided with a fixing member holding portion 28 for holding the fixing member 50 between a pair of connecting insertion pieces 23. Specifically, a holding protrusion 29 protrudes toward the other member from the inner surfaces facing each other of the pair of second insertion pieces 22. The pair of holding protrusions 29 each have a groove on the front end surface. The pair of holding protrusions 29 are arranged in a manner facing each other. In the second joining member 20, a fixing member holding portion 28 is formed as a gap for inserting and holding the fixing member 50 between the grooves on the front end surfaces of the pair of holding protrusions 29. The distance from the plane portion 21 to the center of the fixing member holding portion 28 is the same as the distance from the end of the angle tube portion 11 in the Z direction to the center of the fixing slit 14.

[0073] In the connecting insert piece 23 of the pair of connecting insert pieces 23, the portion on the front end side of the retaining protrusion 29 is the first extending portion 30, and in the connecting insert piece 23 of the pair of connecting insert pieces 23, the portion on the front end side of the retaining protrusion 29 is the second extending portion 31. The outer surface of the first extending portion 30 is located inside the extended surface of the outer surface of the other portion of the connecting insert piece 23 in which the first extending portion 30 is provided, and the outer surface of the second extending portion 31 is located on the extended surface of the outer surface of the other portion of the connecting insert piece 23 in which the second extending portion 31 is provided. The distance from the outer surface of the first extending portion 30 to the extended surface of the outer surface of the other portion of the connecting insert piece 23 is equal to the thickness of the second extending portion 31.

[0074] The connecting insert piece 23 having the first extension portion 30 is provided with a locking claw portion 32 and a first recessed portion 33. The locking claw portion 32 protrudes outward from the front end of the first extension portion 30. The first recessed portion 33 is recessed from the outer surface of the connecting insert piece 23 on the flat portion 21 side compared to the boundary between the retaining protrusion 29 and the first extension portion 30. The first recessed portion 33 is recessed to the inner side compared to the outer surface of the first extension portion 30, and locks the first claw portion 44 of the third joining member 40 described later.

[0075] On the other hand, a second recessed portion 34 is provided on the connecting insert piece 23 having the second extension portion 31. The second recessed portion 34 is recessed from the inner surface on the second extension portion 31 side relative to the boundary between the retaining protrusion 29 and the second extension portion 31. The locking claw portion 32 or the second claw portion 46 of the third engaging member 40 described later is locked in the second recessed portion 34.

[0076] Furthermore, the second joining member 20 includes a base 35 and a plurality of protrusions 36. The base 35 is in contact with the plane portion 21 in a flat plate shape, and connects a pair of connecting insert pieces 23 to each other. The protrusions 36 are provided on the outer surface of each of the pair of connecting insert pieces 23. The base 35 reinforces the plane portion 21 and the base end of each of the pair of connecting insert pieces 23. The plurality of protrusions 36 protrude linearly in directions orthogonal to the direction in which the connecting insert pieces 23 extend from the plane portion 21. The direction in which the plurality of protrusions 36 are continuously provided is the direction in which the connecting insert pieces 23 extend. In addition, the protrusions 36 are not provided on the outer surface of the first extension portion 30.

[0077] The second bonding member 20 is also made of a metal extrusion molded body, similar to the first bonding member. Here, in the second bonding member 20, the direction parallel to the plane portion 21 and perpendicular to the direction in which the pair of second insertion pieces 22 are spaced apart is referred to as the Z direction, which is the extrusion direction. The direction perpendicular to the Z direction and parallel to the plane portion 21 is referred to as the X direction. The direction perpendicular to the Z direction and perpendicular to the plane portion 21 is referred to as the Y direction (see FIG. 2(d)).

[0078] The second joining member 20 is manufactured by an extrusion forming process, a cutting process and a cutting process. The extrusion forming process forms the outer shape shown in the main view of Figure 2 (a) into a certain cross-sectional shape to form a second extruded body EB2 extending in the extrusion direction (Z direction) (refer to Figure 2 (d)); the cutting process cuts the second extruded body EB2 in a plane (XY plane) orthogonal to the Z direction; and the cutting process cuts off a specified part of the cut body EB2' obtained by the cutting process.

[0079] In the cutting process, the second extruded body EB2 is cut from the end portion in the Z direction at a position of a distance L. In the removing process, a predetermined range (the grid-lined portion in FIG. 2 (e)) is removed from both ends of the cut body EB2' in the Z direction, except for the plane portion 21. Specifically, with respect to the pair of second insertion pieces 22, the range from each end in the Z direction to the distance d is removed; with respect to the pair of connecting insertion pieces 23 and the base 35, the range from each end in the Z direction to the distance d' is removed.

[0080] Thus, the outer shape of the plane portion 21 is a square with a side length of L. In addition, the length of the pair of second insertion pieces 22 in the Z direction is L-2d, which is the length of the end portion embedded in the tubular member 70, and the length of the pair of connecting insertion pieces 23 and the base 35 in the Z direction is L-2d', which is the length of the square tube portion 11 embedded in the first joint member.

[0081] The third joint member 40 of the present embodiment includes a flat plate portion 41 having a square outer shape, and a first holding piece 42 and a second holding piece 43 extending from the flat plate portion 41. The first holding piece 42 and the second holding piece 43 extend at right angles to the flat plate portion 41 from positions separated from the inner sides of a pair of side edges extending in parallel by a second predetermined interval on one surface of the flat plate portion 41. The flat plate portion 41 has a square outer shape with a length of one side thereof being L, and a wall thickness being d which is the same as the wall thickness of the tubular member 70.

[0082] The "second predetermined interval" between the first holding piece 42 and the second holding piece 43 and the side of the flat plate portion 41 is set to be approximately equal to the wall thickness d' of the square tube portion 11 in the first joining member 10, similar to the case of a pair of connecting insertion pieces 23 of the second joining member 20. As shown in FIG. 3 (a), the first holding piece 42 extends linearly from the flat plate portion 41. On the other hand, the second holding piece 43 is bent toward the first holding piece 42 at a position extending linearly from the flat plate portion 41 to about half of the length of the first holding piece 42, and then extends to the front end in parallel with the first holding piece 42 to the opposite side of the flat plate portion 41, and the whole is crank-shaped. In the second holding piece 43, the distance between the extended surface of the outer surface on the flat plate portion 41 side and the outer surface on the front end side with the bent portion as the boundary is approximately the same as the wall thickness of the first holding piece 42. In addition, the length from the flat plate portion 41 to the front end of the first holding piece 42 is longer than the length from the flat plate portion 41 to the front end of the second holding piece 43.

[0083] The first retaining piece 42 is provided with a first claw portion 44 protruding from the front end toward the second retaining piece 43 and a first groove portion 45 recessed in the inner surface facing the second retaining piece 43. The first groove portion 45 is provided at a portion near the front end in the center of the direction extending from the first retaining piece 42. These first claw portions 44 and first groove portions 45 are provided over the entire length of the first retaining piece 42 in a direction that is orthogonal to the direction in which the first retaining piece 42 extends from the flat plate portion 41 and is orthogonal to the direction in which the first retaining piece 42 and the second retaining piece 43 are spaced apart.

[0084] The second retaining piece 43 is provided with a second claw 46, a second groove 47 and two inner protrusions 48. The second claw 46 protrudes from the front end of the second retaining piece 43 to the opposite side of the first retaining piece 42. The second groove 47 is recessed in the outer surface on the opposite side of the first retaining piece 42 in the portion where the second retaining piece 43 is bent toward the first retaining piece 42 in a crank shape. The two inner protrusions 48 protrude toward the first retaining piece 42 near the front end of the second retaining piece 43, respectively, and the two inner protrusions 48 are spaced apart in the direction in which the second retaining piece 43 extends. The distance from the flat plate portion 41 to the center between the two inner protrusions 48 is half the length of the angle tube portion 11 in the first joint member in the Z direction. These second claws 46, the second groove 47 and the inner protrusions 48 extend over the entire length of the second retaining piece 43. The extending direction is a direction orthogonal to the direction in which the second retaining piece 43 extends from the flat plate portion 41 and to the direction in which the first retaining piece 42 and the second retaining piece 43 are spaced apart.

[0085] The first claw 44 of the third engaging member 40 is locked in the first recess 33 of the second engaging member 20 or the second groove 47 of another third engaging member 40. The locking claw 32 of the second engaging member 20 or the second claw 46 of another third engaging member 40 is locked in the first groove 45. The second claw 46 is locked in the second recess 34 of the second engaging member 20 or the first groove 45 of another third engaging member 40. The first claw 44 of another third engaging member 40 is locked in the second groove 47.

[0086] In addition, the third engaging member 40 has a plurality of protrusions 49 on the outer surface of each of the first holding piece 42 and the second holding piece 43. The plurality of protrusions 49 extend linearly in the same direction as the second claw portion 46, the second groove portion 47, and the inner protrusion 48. The direction in which the plurality of protrusions 49 are continuously provided is the direction in which the first holding piece 42 and the second holding piece 43 extend. In addition, the protrusions 49 are not provided on the front end side of the second holding piece 43 compared to the portion where the crank is bent.

[0087] The third bonding member 40 is also manufactured from a metal extrusion molded body, similarly to the first bonding member and the second bonding member 20. Here, in the third bonding member 40, the direction parallel to the flat plate portion 41 and perpendicular to the direction in which the first holding piece 42 and the second holding piece 43 are spaced apart is referred to as the Z direction, which is the extrusion direction. The direction perpendicular to the Z direction and parallel to the flat plate portion 41 is referred to as the X direction. The direction perpendicular to the Z direction and perpendicular to the flat plate portion 41 is referred to as the Y direction (refer to FIG. 3(d)).

[0088] The third joining member 40 is manufactured by an extrusion forming process, a cutting process and a cutting process. The extrusion forming process forms the outer shape shown in the main view of Figure 3 (a) into a certain cross-sectional shape to form a third extruded body EB3 extending in the extrusion direction (Z direction) (refer to Figure 3 (d)); the cutting process cuts the third extruded body EB3 by a plane (XY plane) orthogonal to the Z direction; and the cutting process cuts off a specified part of the cut body EB3' obtained by the cutting process.

[0089] In the cutting process, the third extruded body EB3 is cut from the end portion in the Z direction at a position of a distance L. In the removing process, the portions other than the flat plate portion 41 are cut off at both ends of the cut body EB3' in the Z direction. Specifically, the first holding piece 42 and the second holding piece 43 are cut off from both ends in the Z direction to a range of a distance d' (the grid-lined portion in FIG. 3 (e)).

[0090] Thus, the outer shape of the flat plate portion 41 is a square with one side length L. The length of each of the first holding piece 42 and the second holding piece 43 excluding the flat plate portion 41 in the Z direction is L-2d', which is the length of the square tube portion 11 fitted into the first joint member.

[0091] The fixing member 50, such as Figure 4 As shown, it includes a flat plate portion 51 having a rectangular and flat plate shape and a head portion 52 provided along one of the two short sides of the flat plate portion 51. The flat plate portion 51 has both ends of the short side opposite to the head portion 52 chamfered in a C shape, and is tapered toward the short side. The head portion 52 is formed to have a larger wall thickness than the flat plate portion 51.

[0092] In the fixing member 50, the length of the direction in which the long side of the flat plate portion 51 extends is the same as the length L of one side of the square which is the outer shape when the square tube portion 11 of the first joining member is viewed from the Z direction. In addition, the length of the short side of the flat plate portion 51 (the length of the portion without a tapered portion) is the same as the length of the fixing slit 14 of the first joining member. In addition, the length of the short side of the flat plate portion 51 is the same as the distance between the fixing member holding portion 28 facing each other in the second joining member 20. Furthermore, the thickness of the flat plate portion 51 is the same as the width length in the Z direction in the fixing slit 14. In addition, the thickness of the flat plate portion 51 is the same as the width length of the groove in the fixing member holding portion 28 of the second joining member 20 (the distance between the two side walls constituting the groove).

[0093] This fixing member 50 is also manufactured from a metal extrusion-molded body, similarly to the first and second joining members 20. Here, the direction in which the short side of the flat plate portion 51 extends is the Z direction, the thickness direction of the flat plate portion 51 is the X direction, and the direction in which the long side of the flat plate portion 51 extends is the Y direction. The fixing member 50 is manufactured by an extrusion molding step of forming an extrusion-molded body with the Z direction as the extrusion direction, a cutting step of cutting the extruded extrusion-molded body by a plane (XY plane) orthogonal to the Z direction, and a cutting step of cutting off a predetermined portion of the cut body obtained by the cutting step (here, C-shaped chamfering is performed).

[0094] The wedge member 60, such as Figure 5 As shown, it is formed into a flat plate with a rectangular outer shape. The wedge member 60 has two short sides, and both ends of the short side of one of the two short sides are chamfered in a C shape, and it tapers toward the short side. In the wedge member 60, the length in the direction in which the long side extends is the same as the length L of one side of the square that is the outer shape of the orthogonal cross section of the tubular member 70. The length of the short side of the wedge member 60 (the length of the portion without the taper) is the same as the length of the slit 75 in the tubular member 70. In addition, the length of the short side of the wedge member 60 is the same as the distance between the pair of wedge retaining portions 15 in each of the pair of first insertion pieces 12 and the pair of first insertion pieces 13. The thickness of the wedge member 60 is the same as the width length of the slit 75 (the length of the tubular member 70 in the longitudinal direction). In addition, the thickness of the wedge member 60 is the same as the distance between the two inner protrusions 16 provided on each of the first insertion pieces 12 and 13.

[0095] This wedge member 60 is also manufactured from a metal extrusion molded body, similarly to the first and second joint members 20. Here, in the wedge member 60, the direction in which the short side extends is the Z direction, the thickness direction is the X direction, and the direction in which the long side extends is the Y direction. The wedge member 60 is manufactured by an extrusion molding step of forming an extrusion molded body with the Z direction as the extrusion direction, a cutting step of cutting the extruded extrusion molded body by a plane (XY plane) orthogonal to the Z direction, and a cutting step of cutting off a predetermined portion of the cut body obtained by the cutting step (here, C-shaped chamfering is performed).

[0096] Next, the three-dimensional frame structure using the above-mentioned structures is constructed mainly using Figure 6 First, the corner part (refer to Figure 7 ) is used to explain the construction of the corner part. Figure 6 In the three-dimensional frame-shaped skeleton structure shown in the figure, the tubular member 70 is joined in only one direction among the X direction, the Y direction, and the Z direction, with the corner tube portion 11 of the first joint member as the center. When constructing this corner portion, the tubular member 70, the L-shaped first joint member 10A, the second joint member 20, the third joint member 40, the fixing member 50, and the wedge member 60 are used. In addition, when constructing the skeleton structure, if the first joint member is used in a direction in which the Z direction (pressing direction) becomes the height direction, the construction work can be easily performed.

[0097] First, the first joining member 10A having one fixed slit 14 and the second joining member 20 are joined. Specifically, in a state where the first joining member 10A is formed in a direction in which the fixed slit 14 is located above the center in the height direction of the square tube portion 11, a pair of connecting insert pieces 23 of the second joining member 20 are inserted into the square tube portion 11 from above so that the flat surface portion 21 abuts against the square tube portion 11. At this time, the direction in which the pair of connecting insert pieces 23 are spaced apart is the same as the direction in which the fixed slit 14 extends.

[0098] Next, the fixing member 50 is inserted into the fixing slit 14 of the angle tube 11 from the short side opposite to the head 52. Since the fixing member holding portion 28 and the fixing slit 14 provided on the pair of connecting insertion pieces 23 correspond to each other in the positional relationship as described above, the flat plate portion 51 of the fixing member 50 is inserted between the grooves of the pair of fixing member holding portions 28 to be held as shown in FIG8 (a). Since the pair of connecting insertion pieces 23 are pressed in the direction of being separated from each other by inserting the flat plate portion 51 between the grooves of the pair of fixing member holding portions 28, the plurality of protrusions 36 provided on the outer surface of each of the pair of connecting insertion pieces 23 press the inner surface of the angle tube 11. In addition, since the length of the fixing member 50 in the longitudinal direction is equal to the length L of one side of the square which is the outer shape of the angle tube 11 as described above, the two ends of the fixing member 50 in the longitudinal direction are respectively inserted into the fixing slit 14 as shown in FIG8 (b). Therefore, the first engaging member 10A can be prevented from being pulled out of the second engaging member 20 by the friction resistance between the inner surface of the square tube portion 11 and the plurality of protrusions 36 and the mechanical coupling between the fixing slit 14 and the fixing member 50 .

[0099] As described above, when the second joining member 20 is joined to the first joining member 10A, the pair of second insertion pieces 22 of the second joining member 20 are extended in the Z direction (upward in this case). In addition, when the second joining member 20 is inserted into the square tube portion 11, a gap into which the second extension portion 31 or the first retaining piece 42 can be inserted is formed between the inner surface of the square tube portion 11 and the outer surface of the first extension portion 30.

[0100] Next, the third joining member 40 is joined to the square tube portion 11. Specifically, the first retaining piece 42 and the second retaining piece 43 of the third joining member 40 are inserted into the square tube portion 11 from below, and the flat plate portion 41 is brought into contact with the square tube portion 11. At this time, because the second joining member 20 has been joined to the square tube portion 11, the first extension portion 30 and the first retaining piece 42 are made to face each other, and the second extension portion 31 and the second retaining piece 43 are made to face each other.

[0101] In the third joint member 40, when the first holding piece 42 and the second holding piece 43 are inserted into the angled tube portion 11, the outer surface of the first holding piece 42 and the outer surface of the second holding piece 43 on the flat plate portion 41 side relative to the crank portion are in contact with the inner surface of the angled tube portion 11, and a gap into which the second extension portion 31 or the first holding piece 42 can be inserted is formed between the outer surface of the second holding piece 43 on the front end side relative to the crank portion and the inner surface of the angled tube portion 11. In addition, in the second joint member 20 and the third joint member 40, the positional relationships between the locking claw portion 32 and the first groove portion 45, between the first recessed portion 33 and the first claw portion 44, and between the second recessed portion 34 and the second claw portion 46 are made to correspond to each other. Therefore, when the third engaging member 40 is engaged with the angle tube portion 11 , the locking claw portion 32 is locked in the first groove portion 45 , the first claw portion 44 is locked in the first recess 33 , and the second claw portion 46 is locked in the second recess 34 , thereby preventing the third engaging member 40 from being pulled out of the angle tube portion 11 .

[0102] In the state where the second joining member 20 and the third joining member 40 are joined to the square tube portion 11 , a cube having a side length of L is formed by the four side surfaces of the square tube portion 11 , the plane portion 21 , and the flat plate portion 41 .

[0103] Next, the tubular member 70 is joined to the first joining member 10A and the second joining member 20 by fitting the end of one tubular member 70 to the first insertion piece 12, the first insertion piece 13, and the second insertion piece 22. Here, the pair of first insertion pieces 12 are used as an example for explanation. An inclined protrusion 17 is formed at the front end of each of the first insertion pieces 12, which protrudes toward the square tube portion 11. Since the inclined protrusion 17 is inclined outward from the front end of the first insertion piece 12, the relative insertion of the first insertion piece 12 to the tubular member 70 is guided.

[0104] Furthermore, when the tubular member 70 is inserted into the pair of first insertion pieces 12, the end of the tubular member 70 abuts against the square tube portion 11. In this state, the side surfaces of the cube formed by the side surfaces of the square tube portion 11, the plane portion 21, and the flat plate portion 41 and the corresponding side surfaces of the tubular member 70 are on the same plane, and a good-looking structure is formed without a step therebetween. In addition, since there is no step between the joint member and the tubular member 70, there is no risk of the installation on the installation surface becoming unstable or shaking in the constructed skeleton structure.

[0105] When the tubular member 70 is inserted into the pair of first insertion pieces 12, the wedge member 60 is inserted into the slit 75 provided near the end of the tubular member 70. The wedge retaining portion 15 provided on the pair of first insertion pieces 12 and the slit 75 are arranged to correspond to each other in the positional relationship as described above. Therefore, as shown in FIG8(b), the flat-plate-shaped wedge member 60 is respectively retained between the pair of wedge retaining portions 15 which are the gaps between the two inner protrusions 16. In addition, as described above, since the length of the wedge member 60 in the longitudinal direction is made equal to the length L of one side of the square which is the outer shape of the tubular member 70, as shown in FIG8(a), the two ends of the wedge member 60 in the longitudinal direction are respectively in a state of being inserted into the slit 75. Therefore, when an external force acts on the tubular member 70 in which the first insertion piece 12 of the first joint member 10A is inserted, the wedge member 60 prevents the first insertion piece 12 from being deformed or bent longitudinally.

[0106] By making it as described above, the tubular member 70 with the axial direction in the X direction can be joined to the first joint member 10A. And, with respect to the remaining pair of first insertion pieces 13 and the pair of second insertion pieces 22, the ends of each tubular member 70 are fitted outwardly in the same manner as described above, and then the wedge member 60 is inserted into the slit 75 of the tubular member 70. Thus, the tubular member 70 with the axial direction in the Y direction and the tubular member 70 with the axial direction in the Z direction are joined to the first joint member 10A. That is, a tubular member 70 with the axial direction in the X direction, a tubular member 70 with the axial direction in the Y direction, and a tubular member 70 with the axial direction in the Z direction can be joined by an L-shaped first joint member 10A and a second joint member 20 to construct a corner portion in a three-dimensional frame-shaped skeleton structure.

[0107] In the construction of a three-dimensional frame-shaped skeleton structure, for example, by using a T-shaped first joint member 10B and a second joint member 20 as shown in FIG. 10 (a) and FIG. 10 (b) together, it is possible to join a tubular member 70 whose axial direction is the X direction, two tubular members 70 whose axial direction is the Y direction, and a tubular member 70 whose axial direction is the Z direction. In addition, by using a cross-shaped first joint member 10C and a second joint member 20 as shown in FIG. 11 (a) and FIG. 11 (b) together, it is possible to join two tubular members 70 whose axial direction is the X direction, two tubular members 70 whose axial direction is the Y direction, and a tubular member 70 whose axial direction is the Z direction.

[0108] By combining each of the L-shaped first bonding member 10A, the T-shaped first bonding member 10B, and the cross-shaped first bonding member 10C with one second bonding member 20, an upper structure in a three-dimensional frame-shaped skeleton structure can be constructed (see Figure 6The upper part of the structure) and the lower structure (refer to Figure 6 in the lower part).

[0109] Next, in the three-dimensional frame-shaped skeleton structure, the two tubular members 70 are joined vertically with the axial direction being the Z direction (see Figure 6 The structure of the first joining member 10A' is mainly explained using Figures 12 (a) to 12 (c). In Figures 12 (a) to 12 (c), an L-shaped first joining member 10A' is shown as an example. In this first joining member 10A', two fixing slits 14 are provided at intervals in the Z direction on each of a pair of parallel side surfaces of the angle tube portion 11. The two fixing slits 14 are symmetrically provided with the center of the Z direction in the angle tube portion 11 as a boundary. In addition, the other structures in the first joining member 10A' are the same as those of the first joining member 10A, and the description of the joining of the tubular member 70 in the X direction and the Y direction is omitted.

[0110] This first joining member 10A' can join the second joining member 20 to both sides of the square tube 11 in the Z direction. Specifically, with respect to the square tube 11 of the first joining member 10A', a pair of connecting insert pieces 23 of the second joining member 20 are inserted from above, and a pair of connecting insert pieces 23 of the other second joining member 20 are inserted from below. Since the first extension 30 and the second extension 31 of the second joining member 20 are mutually corresponding shapes as described above, the second extension 31 of the other second joining member 20 is inserted between the first extension 30 of the one second joining member 20 and the inner surface of the square tube 11, and the locking claw 32 provided at the front end of the first extension 30 of the one second joining member 20 is locked in the second recess 34 of the other second joining member 20 (refer to FIG. 12 (c)). By locking the locking claw 32 in the second recess 34, the two second joining members 20 can be prevented from being pulled out of the square tube 11.

[0111] Furthermore, when the pair of connecting insertion pieces 23 of the second joining member 20 are inserted from the top and bottom of the square tube 11, the fixing members 50 are respectively inserted into the two fixing slits 14 spaced apart from each other in the top and bottom (Z direction). Thus, for the same reason as described above, the two second joining members 20 are joined to the first joining member 10A', and the pair of second insertion pieces 22 are in a state of extending upward and downward from the square tube 11 (refer to FIG. 12 (b)). Then, the ends of the tubular member 70 are respectively fitted to the pair of second insertion pieces 22 extending upward and downward from the square tube 11, and then the wedge member 60 is inserted into the slit 75 near the end of the tubular member 70. Thus, the two tubular members 70 with the axial direction in the Z direction can be joined to the first joining member 10A'.

[0112] Furthermore, by providing the fixing slits 14 in the locations indicated by the dotted lines in FIG. 10( b ) and FIG. 11( b ), respectively, with respect to the T-shaped first joining member 10B and the cross-shaped first joining member 10C, the first joining member 10B' and the first joining member 10C' can be respectively formed. Thus, the two tubular members 70 whose axial direction is the Z direction can be joined to the first joining member 10B' and the first joining member 10C'.

[0113] In this way, among the joining members for joining the plurality of tubular members 70, by using the first joining member of a type corresponding to the direction and number of the tubular members 70 to be joined, it is possible to construct Figure 6 A three-dimensional frame-like skeleton structure as shown.

[0114] Incidentally, the joining member of this embodiment can also construct a two-dimensional frame-shaped skeleton structure parallel to the XY plane by joining the tubular member 70 only to the first joining member without joining the second joining member 20. In this case, the two third joining members 40 are joined to the first joining member.

[0115] Specifically, as shown in FIG. 13 (a) to FIG. 13 (c), with respect to the first joint member 10A with the axial direction of the square tube portion 11 directed in the up-down direction, the first retaining piece 42 and the second retaining piece 43 of the third joint member 40 are inserted into the square tube portion 11 from above, and the first retaining piece 42 and the second retaining piece 43 of another third joint member 40 are inserted into the square tube portion 11 from below, so that the respective flat plate portions 41 abut against the square tube portion 11. Thus, a cube having a side length of L is formed by the four side surfaces of the square tube portion 11, the flat plate portion 41 of the third joint member 40 on the upper side, and the flat plate portion 41 of the third joint member 40 on the lower side (see FIG. 13 (b)). Moreover, by joining the tubular member 70 to the first joint member 10A in this state, the side surfaces of the above-mentioned cube and the corresponding side surfaces of the tubular member 70 are on the same plane, and a structure having a good appearance without a step between them is formed. In addition, since there is no step between the joint member and the tubular member 70, there is no risk that the constructed frame structure will become unstable or shake when installed on the installation surface.

[0116] In addition, since the first retaining piece 42 and the second retaining piece 43 of the third engaging member 40 are shaped to correspond to each other as described above, the first retaining piece 42 of one third engaging member 40 is inserted between the outer surface of the second retaining piece 43 of the other third engaging member 40, which is on the front end side compared to the crank portion, and the inner surface of the square tube portion 11. In addition, the first claw portion 44 at the front end of the first retaining piece 42 of one third engaging member 40 is engaged with the second groove portion 47 of the other third engaging member 40, and the second claw portion 46 at the front end of the second retaining piece 43 of one third engaging member 40 is engaged with the first groove portion 45 of the other third engaging member 40 (see FIG. 13 (c)). By the engagement of the first claw portion 44 and the second groove portion 47 and the engagement of the second claw portion 46 and the first groove portion 45, the two third engaging members 40 can be prevented from being pulled out of the square tube portion 11.

[0117] Alternatively, the fixing member 50 may be inserted into the fixing slit 14 of the first bonding member to fill the opening of the fixing slit 14 .

[0118] Furthermore, by using the first joining members of a type corresponding to the direction and number of the tubular members 70 to be joined, various two-dimensional frame-shaped skeleton structures can be constructed.

[0119] The two-dimensional frame or three-dimensional frame structure constructed in this way can be used for a variety of purposes such as a platform, a temporary building, a greenhouse frame, a large billboard, a sign frame, a trolley, etc. The use is not particularly limited, but it is suitable for uses that require high mechanical strength and high stability without strain and shaking.

[0120] As described above, according to the present embodiment, when the second joining member 20 is joined to the first joining member and the fixing member 50 is inserted into the fixing slit 14, the fixing member 50 is held in the fixing member holding portion 28, so that the relative movement of the second joining member 20 in the axial direction with respect to the square tube portion 11 can be prevented. Thus, compared with the prior art, the joining strength between the first joining member and the second joining member 20 can be improved, and the joining strength between the tubular member 70 whose axial direction is the X direction or the Y direction and the tubular member 70 whose axial direction is the Z direction can be improved. Therefore, a skeleton structure having high joining strength between the tubular members 70 can be provided.

[0121] By the way, a test body was prepared in which the tubular member 70 was joined to the first joining member via the second joining member 20, with the length L of one side of the square as the outer shape of the tubular member 70 being 40 mm, the wall thickness d of the tubular member 70 being 2 mm, and the joining member and the tubular member 70 being made of an expanded material made of an aluminum alloy. With the square tube portion 11 of the test body fixed, a cantilever bending test was performed in which a load was applied in the X direction or the Y direction at a predetermined position (here, 80 mm) from the square tube portion 11 in the Z direction of the tubular member 70. As a result, the maximum load until the longitudinal bending was 3872 N in the X direction and 4607 N in the Y direction, and it was confirmed that sufficient joining strength was obtained.

[0122] In addition, since the first joining member and the second joining member 20 can be joined with high joining strength by inserting a pair of second insertion pieces 22, it is not necessary to weld them. In addition, as described above, since welding is not required, the skeleton structure can be constructed even in an environment where welding is difficult. In addition, although welding is not required to construct the skeleton structure of this embodiment, it is not a structure that excludes the possibility of welding.

[0123] Furthermore, in the present embodiment, all the members for joining with the tubular member 70, such as the first joining member (L-shaped first joining member 10A, T-shaped first joining member 10B, cross-shaped first joining member 10C), the second joining member 20, the third joining member 40, the fixing member 50 and the wedge member 60, are manufactured by extrusion molding in the same manner as the tubular member 70. Therefore, all the structural elements of the skeleton structure can be formed of a metal material of the same composition. For example, all the structural elements of the skeleton structure can be made of an aluminum alloy made of an expanded material. As a result, the conventional problem of strain in the skeleton structure due to the difference in thermal expansion coefficients between the members can be eliminated.

[0124] In addition, when components are welded to each other, the composition of the welded parts may be different from the composition of the components, and there is a risk of strain in the skeleton structure due to the difference in thermal expansion coefficients. However, according to the present embodiment, as described above, since welding work is not required, there is no risk of strain in the skeleton structure due to welding.

[0125] Furthermore, as described above, since all the structural elements of the skeleton structure can be formed of a metal material of the same composition, there is no need to perform separation work when discarding, and further, the material can be easily handled for recycling.

[0126] In addition, in this embodiment, the frame structure is constructed by embedding the components, and screws and bolts are not used at all, so electrolytic corrosion is effectively prevented.

[0127] As mentioned above, although the present invention has been described by giving suitable embodiments, the present invention is not limited to the above-mentioned embodiments, and various modifications and designs can be made without departing from the gist of the present invention as described below.

[0128] For example, in the above description, the outer shape of the orthogonal section of the tubular member 70 is a square and the outer shape of the square tube portion 11 in the first joint member as viewed from the Z direction is a square of the same size. In this case, there is an advantage that a single type of tubular member 70 can be used as the tubular member 70 to be joined in the X direction, the Y direction, and the Z direction, regardless of the direction. However, if it is decided to use different types of tubular members 70 according to the direction of joining or the direction of joining is taken into consideration, the outer shape of the orthogonal section of the tubular member 70 and the outer shape of the square tube portion 11 of the first joint member as viewed from the Z direction may be a rectangle. In such a case, the size and shape may be set so that the side surfaces of the structural members of the skeleton structure are on the same plane.

Claims

1. A joining member comprising a first joining member, a second joining member and a fixing member, wherein: The first joint member comprises a square tube portion, a pair of first insertion pieces and a fixing slit. The corner tube part is in the shape of a rectangular parallelepiped or a cube; The pair of first insertion pieces extend in the X direction or the Y direction orthogonal to the Z direction at a position inside a pair of side edges extending in the Z direction at a predetermined interval from each side edge of the pair of side edges extending in the Z direction, on each of at least two side edges of the square tube portion that are parallel to the Z direction as the axial direction; The fixing slit penetrates each of a pair of opposing side surfaces in the above-mentioned square tube portion in the thickness direction, and the above-mentioned fixing member is inserted therein. The second joining member includes a flat surface portion, a pair of second insertion pieces, a pair of connecting insertion pieces, and a fixing member holding portion. The plane portion is a square or rectangular plane portion; The pair of second insertion pieces extend from the planar portion at right angles along each of a pair of side edges on one surface of the planar portion; The pair of connecting insert pieces extend from the plane portion at right angles along each of a pair of side edges on the surface of the plane portion opposite to the surface from which the second insert piece extends, and are inserted into the angle tube portion; The fixing member holding portion is provided on each of the pair of connecting insertion pieces and is used to hold the fixing member between each other.

2. A skeleton structure constructed by connecting a tubular member as an angle tube with a joint member including a first joint member, a second joint member and a fixing member, characterized in that: The first joint member comprises a square tube portion, a pair of first insertion pieces and a fixing slit. The corner tube part is in the shape of a rectangular parallelepiped or a cube; The pair of first insertion pieces extend in the X direction or the Y direction orthogonal to the Z direction at a position inside a pair of side edges extending in the Z direction at a predetermined interval from each side edge of the pair of side edges extending in the Z direction, on each of at least two side edges of the square tube portion that are parallel to the Z direction as the axial direction; The fixing slit penetrates each of a pair of opposing side surfaces in the above-mentioned square tube portion in the thickness direction, and the above-mentioned fixing member is inserted therein. The second joining member includes a flat surface portion, a pair of second insertion pieces, a pair of connecting insertion pieces, and a fixing member holding portion. The plane portion is a square or rectangular plane portion; The pair of second insertion pieces extend from the planar portion at right angles along each of a pair of side edges on one surface of the planar portion; The pair of connecting insert pieces extend from the plane portion at right angles along each of a pair of side edges on the surface of the plane portion opposite to the surface from which the second insert piece extends, and are inserted into the angle tube portion; The fixing member holding portion is provided on each of the pair of connecting insertion pieces and is used to hold the fixing members between each other. The second joining member is fixed to the first joining member by inserting the pair of connecting insertion pieces into the angled tube portion and holding the fixing member inserted into the fixing slit in the fixing member holding portion. The plurality of tubular members are joined by inserting the pair of first insertion pieces and the pair of second insertion pieces into end portions of different tubular members, respectively.

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