Assembly structure

Abstract

To provide an assembly structure that can be easily assembled from a small number of parts while retaining strength.SOLUTION: The assembly structure includes: a joint member which includes a first opening provided in a first surface, a second opening provided in a second surface adjacent to the first surface, and a third opening provided in a third surface which is adjacent to the first surface and is provided at a position corresponding to the second surface; a first frame member inserted into the first opening and having a first protrusion section at a longitudinal end section thereof; a second frame member inserted into the second opening and having a second protrusion section at an end section thereof; and a fixing member inserted into the third opening and fixing the first frame member and the second frame member.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an assembled structure. [Background technology]

[0002] Conventionally, there are many prefabricated structures for use in indoor and outdoor environments on the market. By combining frame members and joint members, prefabricated structures can be widely used as shelves, interior materials, and other applications. Patent Document 1 discloses an example of an prefabricated structure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-155731 A Summary of the Invention [Problem to be solved by the invention]

[0004] On the other hand, in the case of the assembled structure of Patent Document 1, when joining each frame member (rod-shaped member), many screws and joining metal fittings are required according to the number of frame members, so there is a risk of losing the members. In addition, there are many steps for attaching the members, making assembly complicated. Furthermore, in the case of conventional assembled structures, it is necessary to increase the strength of the material itself in order to obtain high strength (load resistance), which increases the material cost.

[0005] Furthermore, in the case of conventional assembled structures that are different from the assembled structure of Patent Document 1, the parts of the joint members may have different shapes depending on the location. If the parts of the joint members are used in a location (corner) that is not the corresponding location, the corner will protrude. This can impair the appearance and usability, and can make it difficult to use.

[0006] The present invention aims to solve the above problems and provides an assembly structure that can be easily assembled with a small number of parts and can maintain its strength. Another object of the present invention is to provide an assembly structure that can maintain its strength and design (appearance) regardless of the corresponding location or orientation. [Means for solving the problem]

[0007] According to one embodiment of the present invention, there is provided an assembled structure including a joint member including a first opening provided on a first surface, a second opening provided on a second surface adjacent to the first surface, and a third opening provided on a third surface adjacent to the first surface and provided at a position corresponding to the second surface; a first frame member inserted into the first opening and having a first convex portion at a longitudinal end; a second frame member inserted into the second opening and having a second convex portion at an end; and a fixing member inserted into the third opening and fixing the first frame member and the second frame member.

[0008] In the above-described assembled structure, the joint member may have a hexahedral structure.

[0009] In the above assembled structure, the third opening may be disposed opposite the second opening.

[0010] In the above assembly structure, the fixing member has a through hole in the insertion direction into the third opening, the second protrusion has a screw hole, and the fixing member has a screw inserted into the through hole of the fixing member and The second frame member may be fixed by being inserted into the screw hole.

[0011] In the above assembly structure, the second convex portion of the second frame member may have a screw hole at a tip, and the fixing member may have a screw portion arranged to correspond to the screw hole, and the screw portion may be inserted into the screw hole.

[0012] In the above assembled structure, the first convex portion of the first frame member may be arranged to correspond to the fixing member, and the fixing member may engage with the first convex portion of the first frame member to fix the first frame member.

[0013] In the above assembled structure, the first protrusion may protrude in a direction intersecting the longitudinal direction, and the fixing member may have a recess at an end portion, the recess being fitted into the first protrusion.

[0014] In the above assembled structure, one surface of the first protrusion and a side surface of the recess may be substantially parallel to each other.

[0015] In the above assembled structure, the fixing member may have a cutout portion extending at a position corresponding to the first surface of the joint member, and the width of the cutout portion may be smaller than the width of the first convex portion of the first frame member. Effect of the Invention

[0016] By using one embodiment of the present invention, it is possible to provide an assembled structure that can be easily assembled using a small number of parts and that can maintain its strength. [Brief description of the drawings]

[0017] [Figure 1] 1 is a schematic perspective view of an assembly structure according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a schematic perspective view of components of an assembly structure according to an embodiment of the present invention. [Diagram 3] 1 is a schematic cross-sectional view of parts of an assembly structure according to an embodiment of the present invention; [Figure 4] FIG. 2 is a schematic side view of components of an assembly structure according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a schematic plan view of components of an assembly structure according to an embodiment of the present invention; [Figure 6] FIG. 2 is a schematic perspective view of components of an assembly structure according to an embodiment of the present invention. [Figure 7]1 is a schematic plan view showing an assembly structure according to an embodiment of the present invention; [Figure 8] 1 is a schematic plan view showing an assembly structure according to an embodiment of the present invention; [Figure 9] 1 is a schematic cross-sectional view showing an assembly structure according to one embodiment of the present invention. [Figure 10] 1A to 1C are schematic diagrams illustrating a method for assembling an assembly structure according to an embodiment of the present invention. [Figure 11] 1A to 1C are schematic diagrams illustrating a method for assembling an assembly structure according to an embodiment of the present invention. [Figure 12] 1A to 1C are schematic diagrams illustrating a method for assembling an assembly structure according to an embodiment of the present invention. [Figure 13] FIG. 2 is a schematic perspective view of components of an assembly structure according to an embodiment of the present invention. [Figure 14] 1 is a schematic cross-sectional view of parts of an assembly structure according to an embodiment of the present invention; [Figure 15] FIG. 2 is a schematic perspective view of components of an assembly structure according to an embodiment of the present invention. [Figure 16] FIG. 2 is a schematic plan view of components of an assembly structure according to an embodiment of the present invention; [Figure 17] FIG. 2 is a schematic perspective view of components of an assembly structure according to an embodiment of the present invention. [Figure 18] 1A to 1C are schematic diagrams illustrating a method for assembling an assembly structure according to an embodiment of the present invention. [Figure 19] FIG. 2 is a schematic perspective view of components of an assembly structure according to an embodiment of the present invention. [Figure 20] FIG. 2 is a schematic plan view of components of an assembly structure according to an embodiment of the present invention; [Figure 21] FIG. 2 is a schematic perspective view of components of an assembly structure according to an embodiment of the present invention. [Figure 22] 1A to 1C are schematic diagrams illustrating a method for assembling an assembly structure according to an embodiment of the present invention. [Diagram 23] FIG. 2 is a schematic perspective view of components of an assembly structure according to an embodiment of the present invention. [Figure 24] FIG. 2 is a schematic perspective view of components of an assembly structure according to an embodiment of the present invention. [Diagram 25] 1A to 1C are schematic diagrams illustrating a method for assembling an assembly structure according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, each embodiment of the invention disclosed in this application will be described with reference to the drawings. However, the present invention can be embodied in various forms without departing from the gist of the invention, and the present invention should not be interpreted as being limited to the description of the embodiments exemplified below.

[0019] In the drawings referred to in this embodiment, the same parts or parts having similar functions are given the same or similar symbols (symbols consisting of only A, B, -1, -2, etc. suffixed to a number) and their repeated explanation may be omitted. Also, the dimensional ratios in the drawings may differ from the actual ratios for the convenience of explanation, and some components may be omitted from the drawings.

[0020] Furthermore, in the detailed description of the present invention, when defining the positional relationship between a certain component and another component, "above" and "below" do not only mean a component being located directly above or below another component, but also include a component being located between the other components, unless otherwise specified.

[0021] First Embodiment (1-1. Configuration of assembly structure 100) FIG. 1 is a schematic diagram of an assembly structure 100 according to one embodiment of the present invention.

[0022] The assembled structure 100 includes a joint member 110, a frame member 120, and a fixing member 130. The frame member 120 is connected to the joint member to form a three-dimensional structure. In this example, the assembled structure 100 forms a structure in which three to five frame members 120 are joined together.

[0023] (1-2. Configuration of joint member 110) FIG. 2 is a schematic perspective view of the joint member 110. FIG. 3 is a schematic cross-sectional view of the joint member 110 between A1 and A2. The joint member 110 has a hexahedral structure (more specifically, a cubic structure) having six faces. The corners of the joint member 110 may be appropriately chamfered. Even in this case, it can be said that each face is adjacent to four faces excluding the opposite face. An opening 110a is formed in each face of the joint member 110. The inside of the joint member 110 is hollow. In this example, the opening 110a has a square shape. In this case, the corners of the opening 110a may have an R shape due to processing.

[0024] (1-3. Configuration of frame member 120) FIG. 4 is a schematic side view of the frame member 120. FIG. 5 is a schematic plan view of the frame member 120. The frame member 120 is a rod-shaped (columnar) member extending in the longitudinal direction (first direction D1, also referred to as the extension direction). Specifically, the frame member 120 includes a first columnar portion 121, an annular convex portion 123, a second columnar portion 125, a third columnar portion 127, and a tip convex portion 129 (also referred to simply as a "convex portion"). The annular convex portion 123, the second columnar portion 125, the third columnar portion 127, and the tip convex portion 129 are provided on both ends of the first columnar portion 121. The annular convex portion 123, the second columnar portion 125, the third columnar portion 127, and the tip convex portion 129 are provided in this order in a continuous manner so as to be away from the first columnar portion 121. As shown in FIG. 5, in this embodiment, when viewed from the longitudinal direction (first direction D1 (plane)), the first columnar portion 121, the annular convex portion 123, the second columnar portion 125, the third columnar portion 127 and the tip convex portion 129 have a quadrilateral (square) shape.

[0025] The first columnar portion 121 has a quadrangular column shape. The length of the first columnar portion 121 can be adjusted appropriately according to the size of the assembled structure 100. The annular protrusion 123 is provided in an annular shape corresponding to the first columnar portion 121. The second columnar portion 125 has a width sufficient to allow it to be inserted into the joint member 110. The annular protrusion 123 is larger than the second columnar portion 125 when viewed from above. As a result, when the frame member 120 is inserted into the joint member 110, the annular protrusion 123 has a function of a stopper. The widths of the third columnar portion 127 and the tip protrusion 129 are smaller than the width of the second columnar portion 125 due to the relationship of fitting with the fixing member 130. The tip protrusion 129 has a convex structure that protrudes in the second direction D2 that intersects (in this case, is perpendicular to) the longitudinal direction (first direction D1). The width of the tip protrusion 129 is larger than the width of the third columnar portion 127. Therefore, the tip protrusion 129 has a shape that protrudes from the third columnar portion 127. In addition, a screw hole 129a is provided at the tip of the tip protrusion 129. In this embodiment, the width of the frame member 120 is smaller than the width of one surface of the joint member 110.

[0026] (1-4. Configuration of fixing member 130) FIG. 6 is a schematic perspective view of the fixing member 130. FIG. 7 is a schematic plan view of the fixing member 130 when viewed from the third direction D3. FIG. 8 is a schematic plan view of the fixing member 130 when viewed from the fourth direction D4 opposite to the third direction D3. FIG. 9 is a schematic cross-sectional view of the fixing member 130 between B1-B2. The fixing member 130 is inserted into the joint member 110. The fixing member 130 has a shape corresponding to the opening 110a of the joint member 110. In this example, the fixing member 130 has a square shape when viewed from the third direction D3 and the fourth direction D4. The fixing member 130 has a through hole 131 in the extending direction (the direction of insertion into the joint member 110, as described later). The fixing member 130 has a first recess 133 (also simply referred to as a "recess") and a second recess 135. The first recess 133 is provided on the first surface 130a (the surface that is inserted into the joint member 110 first). The first recess 133 has an inclined side surface 133a and a bottom surface 133b. The first recess 133 has an inclined side surface 133a. The second recess 135 is provided on the second surface 130b side. The first recess 133 and the second recess 135 are arranged opposite to each other. The first recess 133, the through hole 131, and the second recess 135 are provided in a continuous manner.

[0027] (1-5. How to assemble the assembly structure) A method for assembling the assembly structure 100 will be described below. Figures 10 to 12 are schematic cross-sectional views illustrating the method for assembling the assembly structure 100.

[0028] As shown in Fig. 10, first, the frame member 120 is inserted into the opening 110a of the joint member 110. In this example, the frame member 120-1 (also referred to as the "first frame member") is inserted from the opening 110al (also referred to as the "first opening") provided on the left surface, the frame member 120-2 is inserted from the opening 110ar provided on the right surface, and the frame member 120-3 (also referred to as the "second frame member") is inserted from the opening 110ad (also referred to as the "second opening") on the lower surface adjacent to the opening 110a on the left surface. Note that the frame members 120 are also inserted into the openings 110a provided on surfaces not shown in Fig. 10 (surfaces on the near side and the far side of the paper).

[0029] Next, as shown in FIG. 11, the fixing member 130 is inserted into the opening 110au (also referred to as the "third opening") in the upper surface facing the lower surface. At this time, the fixing member 130 engages with the tip convex portion 129 of the frame member 120-1. Specifically, the side surface 129b of the tip convex portion 129 of the frame member 120 and the side surface 133a of the first concave portion 133 of the fixing member 130 are approximately parallel. Therefore, the side surface 129b and the side surface 133a are in contact with each other or close to each other. As a result, the frame members 120-1 and 120-2 are fitted into the first concave portion 133 of the fixing member 130 (the movement of the frame member 120 is restricted).

[0030] 12, a screw 140 is inserted into the through hole 131 of the fixing member 130 and into the screw hole 129a of the lower frame member 120-3 arranged opposite the fixing member 130. All of the frame members 120 are fixed together by fastening the screw 140 to the frame member 120-3. This forms a part of the assembled structure 100. By repeating this method, the assembled structure 100 can be manufactured.

[0031] In the case of conventional assembled structures, when each frame member is joined to a joint member, screws and joining metal fittings are required for each frame, and there is a risk of losing the members. In addition, there are many steps for attaching the members, which is cumbersome. However, in the case of the assembled structure of this embodiment, the joint members, fixing members, and multiple frame members can be combined and fixed, so the number of parts can be reduced. In addition, in the case of this embodiment, since the number of parts is reduced, the number of steps for assembling the assembled structure can be reduced, and the assembled structure can be easily formed.

[0032] In the present embodiment, the four frame members 120 are fitted into the fixing members 130. Furthermore, the fixing members 130 and the opposing frame members 120 are fastened together with the screws 140, so that all the frame members 120 are integrated to reinforce each other, and the strength of the assembled structure 100 can be further increased.

[0033] Therefore, by using this embodiment, it is possible to form an assembly structure that can be easily assembled using a small number of parts and has high strength.

[0034] Furthermore, by using this embodiment, the joint member 110 has the same shape regardless of the location, so it can be used in any location. Also, the width of the frame member 120 is smaller than the width of one surface of the joint member 110, so there are no protruding parts. This allows the assembled structure to be used without compromising the appearance or usability.

[0035] In this embodiment, an example has been shown in which the annular convex portion 123, the second columnar portion 125, the third columnar portion 127, and the tip convex portion 129 are provided on both ends of the first columnar portion 121, but the present invention is not limited to this. Depending on the joining location (for example, the portion that corresponds to the end of the assembled structure), the second columnar portion 125, the third columnar portion 127, and the tip convex portion 129 may not be provided.

[0036] <Second embodiment> In this embodiment, an assembly structure different from that of the first embodiment will be described. Specifically, an assembly structure having a circular or cylindrical joint member will be described. Note that the description of the same configuration as that of the first embodiment will be omitted as appropriate.

[0037] (Configuration of assembly structure 100A) Fig. 13 is a schematic perspective view of a joint member 110A according to this embodiment. Fig. 14 is a schematic cross-sectional view of the joint member 110A according to this embodiment. Fig. 15 is a schematic perspective view of a frame member 120A according to this embodiment. Fig. 16 is a schematic plan view of a frame member 120A according to one embodiment of the present invention. Fig. 17 is a schematic plan view of a fixing member 130A according to this embodiment. Fig. 18 is a schematic view showing a method of assembling an assembly structure 100A according to this embodiment.

[0038] In this embodiment, the assembled structure 100A includes a joint member 110A, a frame member 120A, and a fixing member 130A.

[0039] 13 and 14, the joint member 110A has a circular opening 110a on each surface. The inside of the joint member 110A is hollow. The opening 110a has a recess 113. The recess 113 is continuous with the opening 110a and is provided throughout the entire opening 110a (provided in a ring shape).

[0040] As shown in Fig. 15 and Fig. 16, the frame member 120A has a first columnar portion 121, an annular convex portion 123, a second columnar portion 125, a third columnar portion 127, and a tip convex portion 129. The columnar portion 121, the second columnar portion 125, the third columnar portion 127 and the tip protrusion 129 have a cylindrical (or conical) shape. The annular protrusion 123 has a circular ring shape. The frame member 120A (first columnar portion 121) has a cylindrical shape, which makes it easier for the user to hold the frame member 120 and eliminates corners, thereby reducing the risk of injury.

[0041] As shown in FIG. 17, the fixing member 130A has a circular convex portion 137 at the end of one side of the side surface. The circular convex portion 137 corresponds to the recessed portion 113 of the joint member 110A. The width (outer diameter) of the circular convex portion 137 of the fixing member 130A in one direction is approximately the same as or smaller than the width (diameter) of the recessed portion 113 of the joint member 110A in one direction. Specifically, as shown in FIG. 18, the width (diameter) of the circular convex portion 137 of the fixing member 130A in one direction may be smaller than the width (diameter) of the recessed portion 113 of the joint member 110A in one direction so that a gap of about several millimeters is formed when the fixing member 130A is fitted (inserted) into the joint member 110A.

[0042] By using this embodiment, the annular convex portion 123A of the frame member 120A and the annular convex portion 137 of the fixing member 130A are arranged in the concave portion 113 of the joint member 110A. This makes it difficult for the frame member 120A and the fixing member 130A to come off in the assembled structure 100A. In addition, since the number of concaves and convexes is reduced, a neat and refined impression can be given to the user.

[0043] Furthermore, in the case of this embodiment, when the fixing member 130 is inserted into the joint member 110, it is possible to prevent the fixing member 130 from excessively entering inside the joint member 110 (the fixing member 130 entering the internal space and becoming unable to come out). Note that the annular protrusion 137 is not necessarily provided.

[0044] <Third embodiment> In this embodiment, an assembly structure different from that in the second embodiment will be described. Specifically, an example in which a fixing member has a protrusion in part will be described.

[0045] (Configuration of assembly structure 100B) Fig. 19 is a schematic perspective view of a fixing member 130B according to this embodiment. Fig. 20 is a schematic plan view of a joint member 110B according to this embodiment. As shown in Fig. 19, a protrusion 138 is partially provided on a side surface of one end of the fixing member 130B.

[0046] The joint member 110B has a circular opening 110a. Furthermore, a recess 115 (also called a notch) is provided so as to be continuous with the opening 110a. The recess 115 of the joint member 110B has a shape corresponding to the protrusion 138 of the fixing member 130B (in other words, the recess 115 and the protrusion 138 have a relationship of a key and a keyhole). The width in one direction of the protrusion 138 of the fixing member 130B is smaller than the width in one direction of the recess 115 of the joint member 110B. More specifically, it is desirable that the width in one direction of the protrusion of the fixing member 130B is smaller than the width in one direction of the recess 115 of the joint member 110 so that a gap of about several millimeters is formed when the fixing member 130B is fitted into the joint member 110.

[0047] By using this embodiment, the position of the fixing member 130B is fixed by fitting the convex portion 138 of the fixing member 130B into the concave portion 115 of the joint member 110B, and the assembly structure 100B can be stabilized.

[0048] <Fourth embodiment> In this embodiment, an assembly structure different from that in the second embodiment will be described. Specifically, An example in which the fixing member 130 has cutouts at corresponding positions on each surface will be described.

[0049] (Configuration of assembly structure 100C) FIG. 21 is a schematic perspective view of the fixing member 130C according to this embodiment. FIG. 22 is a schematic view showing a method of assembling the assembly structure 100C according to this embodiment. As shown in FIG. 21, the fixing member 130C extends on the side having the first recess 133. The fixing member 130C has cutouts 139 at positions corresponding to the respective faces of the joint member 110C. The cutouts 139 include a first cutout 139a and a second cutout 139b extending in the direction in which the fixing member 130C extends (fifth direction D5). The first cutout 139a and the second cutout 139b are provided in series and are perpendicular to each other at a predetermined position. The width W139a of the first cutout portion 139a and the width W139b of the second cutout portion 139b are greater than the width W127 of the third columnar portion of the frame member 120 and smaller than the width W129 of the tip protrusion 129.

[0050] In this embodiment, as shown in FIG. 22, after inserting the frame member 120 into the joint member 110A, the fixing member 130C is inserted. At this time, since the fixing member 130C has the cutout portion 139, even if the fixing member 130C is longer in the longitudinal direction than the second embodiment, it can be inserted to the back without contacting the frame member 120A. Also, in this embodiment, the fixing member 130 is inserted until it contacts the end of the first cutout portion 139a. Next, the fixing member 130 is rotated clockwise. This operation causes the frame member 120 to contact the end of the second cutout portion 139b. Finally, the screw 140 is inserted from the through hole 131 of the fixing member 130 to fasten the frame member 120 facing the fixing member 130 to the screw 140. With the above, a part of the assembly structure 100C is completed.

[0051] By using this embodiment, the movement of the frame member 120 is suppressed by the cutout portion 139 together with the first recess 133 of the fixing member 130. Therefore, it is possible to resist a force from a direction intersecting the extending direction of the frame member 120. This makes it possible to stabilize the structure of the assembled structure 100C.

[0052] In this embodiment, the cutout portion 139 has a shape (first cutout portion 139a and second cutout portion 139b) that extends in one direction (longitudinal direction) and intersects at a predetermined position, but the present invention is not limited to this. FIG. 23 is a schematic perspective view of another aspect of the fixing member 130C according to this embodiment. As shown in FIG. 23, the cutout portion 139 may be provided so as to extend in a direction (diagonal direction) that intersects with the direction in which the fixing member 130C extends (longitudinal direction). The width W139 of the cutout portion 139 is larger than the width W127 of the third columnar portion of the frame member 120 and smaller than the width W129 of the tip protrusion 129. This configuration can also resist a force from the extension direction of the frame member 120, as in the cases of FIGS. 21 and 22. This can stabilize the structure in the assembled structure.

[0053] <Fifth embodiment> In this embodiment, an assembly structure different from that in the second embodiment will be described. Specifically, an example of a fixing member provided with a screw portion will be described.

[0054] (Configuration of assembly structure 100D) Fig. 24 is a schematic perspective view of a fixing member 130D according to this embodiment. Fig. 25 is a schematic view showing a method of assembling an assembly structure 100D according to this embodiment.

[0055] As shown in Fig. 24, a screw portion 133c is provided in the first recess 133 on the first surface 130Da side of the fixing member 130D. Therefore, the fixing member 130D does not have a through hole or a second recess. The second surface 130Db facing the first recess 133 may be flat, or may have a recess 136 into which the tip of a flat-head screwdriver can be fitted. As a result, as shown in Fig. 1, by inserting the fixing member 130D clockwise into the joint member 110, the screw portion 133c is inserted into the screw hole 129a of the lower frame member 120A-3 arranged opposite the fixing member 130D. As a result, all the frame members 120 are fixed.

[0056] By using this embodiment, there is no need to prepare new screws, and the assembly structure can be manufactured more easily.

[0057] (Modification) Within the scope of the concept of the present invention, a person skilled in the art may conceive of various modifications and alterations, and it is understood that such modifications and alterations also fall within the scope of the present invention. For example, those in which a person skilled in the art appropriately adds or deletes components, combines or modifies the designs of the above-mentioned embodiments, or adds, omits, or modifies the conditions of processes, are included in the scope of the present invention as long as they include the gist of the present invention.

[0058] In the first embodiment of the present invention, the joint member 110 has a cubic structure as a hexahedral structure, but the present invention is not limited to this. The joint member 110 may be a rectangular parallelepiped. Furthermore, the joint member 110 is not limited to a hexahedron and may be a tetrahedron depending on the application. Furthermore, the joint member 110 may have a spherical structure.

[0059] In the first embodiment of the present invention, an example in which the opening 110a is a square has been shown, but the present invention is not limited thereto. For example, the opening 110a may be a rhombus, a parallelogram, a rectangle, or a polyhedron such as a triangle, a hexagon, or a star. In the second embodiment, an example in which the opening is a circle has been shown, but the present invention is not limited thereto. The opening may be an ellipse or another shape having a curve. [Explanation of symbols]

[0060] 100···assembly structure, 110···joint member, 110a···opening, 110ad···opening, 110al···opening, 110ap···opening, 110ar···opening, 110a···opening, 110C···joint member, 113···recess, 115···recess, 120···frame member, 121···first columnar portion, 123···annular protruding portion, 12 5···Second columnar portion, 127···Third columnar portion, 129···Tip convex portion, 129a···Screw hole, 129b···Side surface, 130···Fixing member, 131···Through hole, 133···First recess, 133a···Side surface, 133b···Bottom surface, 133c···Screw portion, 135···Second recess, 136···Recess, 137···Annular convex portion, 138···Convex portion, 139···Notch portion

Claims

1. a joint member including a first opening provided on a first surface, a second opening provided on a second surface adjacent to the first surface, and a third opening provided on a third surface adjacent to the first surface and provided at a position corresponding to the second surface; a first frame member inserted into the first opening and having a first protrusion at an end in the longitudinal direction; a second frame member inserted into the second opening and having a second protrusion at an end thereof; a fixing member inserted into the third opening and fixing the first frame member and the second frame member, the joint member has a first recess provided in the third opening, the fixing member has a third protrusion provided at an end on a first side of a side surface so as to correspond to the first recess, When the fixing member engages with the first protrusion, the first recess engages with the third protrusion. Assembly structure.

2. The third convex portion is provided in a ring shape at the end of the first side of the side surface, The assembly structure of claim 1 .

3. The third convex portion is partially provided at the end of the first side of the side surface, The assembly structure of claim 1 .

4. The fixing member has a second recess on a second side opposite the first side, the first protrusion of the first frame member and the second recess of the fixing member engage with each other; The assembly structure of claim 1 .

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