HK1237018A1 - Joining structure, joining method, and assembled furniture - Google Patents

Abstract

A joining method is equipped with: a step STl wherein one end of a bolt (30) is screwed into a hole (11) in a first component (10) and the other end is made to protrude from a hole (11); a step ST2 wherein the other end of the bolt (30) protruding from the hole (11) is screwed into a first inner diameter (4la) provided in one end of a connector (40); steps ST3, ST4 wherein three plate-spring-shaped engaging claw parts (43) provided separated from each other in the circumferential direction of a cylinder on the other end of the connector (40) are forcefully fitted from one end into an engagement hole (21) penetrating a second component (20), until the engaging claw parts reach the other end of the engagement hole (21); and a step ST6 wherein a tool T is used to forcefully screw the other end of the bolt (30) (screwed into the first inner diameter (41a)) into a second diameter (41b) continuous with the first inner diameter (41a) and formed toward the other end of the connector (40), thereby pushing out the outside of the second inner diameter (41b) in the diameter direction, and causing the other end of the engagement hole (21) and the engaging claw parts (43) to engage each other.

Description

Joint structure, joint method and assembled furniture

Technical Field

The present invention relates to a joining structure and a joining method for easily and firmly joining 2 members. The present invention also relates to an assembled furniture in which a plurality of components are joined and assembled.

Background

Fig. 7 is a structural sectional view of a conventional joint structure. This conventional bonding structure is disclosed in patent document 1. In fig. 7, 110 is the 1 st member, 120 is the 2 nd member having the engaging hole 121 inserted therein, 130 is a screw having a head 130a, and 140 is an adapter.

In the joining tool 140, 141 is a substantially cylindrical mounting tube portion, 142 is a space, 143 is a plurality of engaging claw portions formed outside the mounting tube portion 141 with the space 142 therebetween, and 143a and 143b are a tapered portion and an engaging stepped portion formed on each of the engaging claw portions 143.

Next, a conventional bonding method will be described. First, as shown in fig. 7 (a), the screw 130 inserted into the mounting tube portion 141 is rotated about the central axis z2 as indicated by an arrow m12, and the screw 130 is screwed into the 1 st member 110 to a screwing depth at which the head portion 130a does not fit between the engaging claw portions 143, thereby temporarily fixing the adapter 140.

Next, as shown in fig. 7 (b), the 2 nd member 120 is moved closer to the 1 st member 110 in the direction indicated by the arrow m13, and the adapter 140 is forcibly fitted into the engagement hole 121. Then, the engagement hole 121 presses the tapered portion 143a as indicated by an arrow m14, and thus the engagement claw 143 is elastically deformed toward the space 142.

Further, as shown in fig. 7 (c), when the engagement hole 121 is fitted to the outer surface of the base end portion of the adapter 140, the engagement claw portion 143 is elastically returned in the direction indicated by the arrow m15, and the engagement stepped portion 143b is engaged with the engagement hole 121. Finally, the screw 130 is rotated about the center axis z2 again as indicated by an arrow m12 to be screwed into the 1 st member 110, and when the bottom surface of the head portion 130a comes into contact with the mounting tube portion 141 and the head portion 130a is fitted between the engaging claw portions 143, the engagement between the 1 st member 110 and the 2 nd member 120 is completed.

As described above, in the conventional joining structure, the joining tool 140 temporarily fixed to the 1 st member 110 is forcibly fitted into the engaging hole 121 of the 2 nd member 120, thereby achieving desired joining. In particular, since the head 130a of the screw 130 is fitted between the engaging claw portions 143, the engaging claw portions 143 are prevented from being elastically deformed toward the space 142 side and from being dislocated.

Documents of the prior art

Patent document

Patent document 1: japanese utility model patent No. 1749899 (Shikoku Showa 63-013724)

Disclosure of Invention

Problems to be solved by the invention

The conventional joining structure has a problem of weak joining force because the head portion of the screw is merely fitted between the engaging claw portions.

The present invention has been made to solve the above-described problems, and an object thereof is to provide a joining structure and a joining method capable of enhancing a joining force.

In addition, another object of the present invention is to provide assembled furniture in which the coupling force is enhanced.

Means for solving the problems

The joint structure of the present invention is a joint structure for joining a 1 st member and a 2 nd member having an engagement hole formed therein, by using a substantially rod-shaped fixing body and a substantially cylindrical joint tool, wherein one end of the fixing body is inserted into the 1 st member, and the other end of the fixing body protrudes from the 1 st member, and the joint tool includes at one end thereof: a 1 st inner diameter part into which the other end of the fixing body protruding from the 1 st member is screwed; and a 2 nd inner diameter portion connected to the 1 st inner diameter portion and formed toward the other end side of the joining tool, wherein when the other end of the 1 st inner diameter portion is forcibly inserted into the 2 nd inner diameter portion by screwing the fastening body, an outer side of the 2 nd inner diameter portion is pressed in a radial direction, and the joining tool includes at the other end thereof: and a plurality of engaging claw portions which are separately provided along the circumferential direction of the cylinder, wherein when the engaging claw portions are forcibly inserted from one end of the engaging hole to reach the other end of the engaging hole and the other end of the fixing body is forcibly inserted into the 2 nd inner diameter portion, the engaging claw portions are engaged with the other end of the engaging hole.

Effects of the invention

By adopting the above-described aspect, such an effect that the joining force can be strengthened can be obtained.

Drawings

Fig. 1 is an external perspective view of a bolt and a joint used in a joint structure according to embodiment 1 of the present invention.

Fig. 2-1 is a structural view (one of) the bonding tool shown in fig. 1.

Fig. 2-2 is a structural view (two) of the bonding tool shown in fig. 1.

Fig. 2-3 are (three) structural views of the adapter shown in fig. 1.

Fig. 3 is a flowchart showing steps of the bonding method according to embodiment 1 of the present invention.

Fig. 4 is an enlarged sectional view of a situation when operating according to the joining method of fig. 3.

Fig. 5-1 is an enlarged sectional view (one of) a condition when operating according to the joining method of fig. 3.

Fig. 5-2 is an enlarged sectional view (two) of the situation when operating according to the joining method of fig. 3.

Fig. 5-3 are enlarged sectional views (three) of the situation when operating according to the joining method of fig. 3.

Fig. 5-4 are enlarged sectional views (fourth) of the situation when operating according to the joining method of fig. 3.

Fig. 6-1 is an enlarged sectional view (one of) a part of the situation when operating according to a joining method partially different from that of fig. 3.

Fig. 6-2 is an enlarged sectional view (two) of a part of the state when the operation is performed according to a joining method partially different from that of fig. 3.

Fig. 7 is a structural sectional view of a conventional joint structure.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Here, the same or equivalent constituent elements in the drawings are given the same or equivalent reference numerals.

Embodiment mode 1

< Structure >

Fig. 1 is an external perspective view of a bolt and a joining tool used in a joining structure according to embodiment 1 of the present invention. Fig. 2 is a structural view of the joint tool shown in fig. 1, fig. 2 (a) is a left side view, fig. 2 (B) is a front view, fig. 2 (C) is a right side view, fig. 2 (D) is a rear view, fig. 2 (e) is a top view, fig. 2 (f) is a bottom view, fig. 2 (g) is a cross-sectional view taken along the line a-a, and fig. 2 (h), (i), and (j) are cross-sectional views taken along the lines B-B, C-C, and D-D, respectively. The line B-B becomes the line C-C when rotated 120 DEG around the central axis of the bonding tool, and becomes the line D-D when rotated 240 deg.

In fig. 1 and 2, 30 is a substantially rod-shaped metal bolt (fastening body), and 40 is a substantially cylindrical resin bonding tool. The joining tool 40 is an article for simply and firmly joining a plurality of members constituting the assembled furniture or the like together with the bolt 30.

In the joining tool 40 shown in fig. 1 and 2, 41 is a substantially cylindrical mounting tube portion provided on one end side of the joining tool 40, 41a and 41b are a 1 st inner diameter portion and a 2 nd inner diameter portion, respectively, 43 are 3 reed-shaped engaging claw portions provided on the other end side of the joining tool 40 so as to be separated from each other in the circumferential direction of the cylinder, 43a and 43b are a tapered portion and an engaging stepped portion formed on the other end side of each engaging claw portion 43, respectively, and 43V is a V-shaped groove formed on the inner circumferential side of the engaging claw portion 43.

Here, the 1 st inner diameter portion 41a is a portion into which the other end side of the bolt 30 is screwed, and has a thread formed on an inner circumference, and an extension length of α from one end of the adapter 40. As can be seen by comparing (h) to (j) of fig. 2, the joining tool 40 has the same shape except that the helical thread portion of the 1 st inner diameter portion 41a is different from the other portions.

On the other hand, as can be seen from fig. 2 (g) to (j), the 2 nd inner diameter portion 41b is provided continuously with the 1 st inner diameter portion 41a, that is, the 2 nd inner diameter portion 41b extends from the boundary with the 1 st inner diameter portion 41a toward the other end side of the joining tool 40 to one end side of the engaging claw portion 43 (the root portion of the engaging claw portion 43 continuous with the mounting tube portion 41) and has an extension length β. The 2 nd inner diameter portion 41b is substantially equal in diameter size to the 1 st inner diameter portion 41a, but is not threaded on the inner circumference.

< bonding >

The bonding method is explained next. Fig. 3 is a flowchart showing steps of a bonding method according to embodiment 1 of the present invention, and fig. 4 and 5 are enlarged cross-sectional views showing a state in which the bonding method of fig. 3 is operated.

First, as shown in fig. 4 (a), the bolt 30 is moved in the direction shown by the arrow m2 while being rotated about the center axis z1 as shown by the arrow m1, and one end side of the bolt 30 is inserted into the hole 11 formed in the first member 10 in the rectangular parallelepiped shape (step ST 1). Since the hole 11 is formed to be shorter than the length of the bolt 30, when the bolt 30 is inserted into the hole 11 as shown in fig. 4 (b), the other end side of the bolt 30 is in a state of protruding from the hole 11 of the 1 st member 10.

Next, the joint 40 shown in fig. 4 (b) is moved as shown by arrow m4 while rotating around the center axis z1 as shown by arrow m3, whereby the other end side of the bolt 30 is screwed into the 1 ST inner diameter portion 41a formed at one end side of the joint 40 to temporarily fix the joint 40 (step ST 2). As described above, since the 2 nd inner diameter portion 41b is not threaded unlike the 1 st inner diameter portion 41a, the other end side of the bolt 30 stays at the boundary between the 1 st inner diameter portion 41a and the 2 nd inner diameter portion 41b after being screwed into the 1 st inner diameter portion 41a having the length α as shown in fig. 4 (c).

Next, as shown in fig. 5 (a), the 2 nd component 20 in a rectangular parallelepiped shape is moved in the direction indicated by the arrow m5 to approach the 1 ST component 10, whereby the engaging hole 21 is forcibly fitted with the adapter 40 temporarily fixed to the bolt 30 on the 1 ST component 10 from the tapered portion 21a inserted through one end side of the engaging hole 21 of the 2 nd component 20 (step ST 3). Since the diameter x2 of the engagement stepped portion 43b is larger than the diameter x1 of the engagement tube 41 and the engagement hole 21, the spring-like engagement claw portion 43 is pressed in the direction indicated by the arrow m6 by the inner periphery of the engagement hole 21 and is elastically deformed inward as shown in fig. 5 (b).

When the 2 nd component 20 is further moved in the direction indicated by the arrow m5 so that the engaging stepped portion 43b reaches the spot-facing portion 21b of the engaging hole 21, the diameter of the spot-facing portion 21b becomes x2, and therefore, as shown in fig. 5 c, the engaging claw portion 43 is elastically returned outward in the direction indicated by the arrow m7 (step ST 4).

The 2 nd member 20 moves forward further in the direction indicated by the arrow m5 due to its own weight, comes into contact with the 1 ST member 10 as shown in fig. 5 (d), and stops, and the other end side of the engaging claw 43 protrudes from the spot facing portion 21b of the engaging hole 21 (step ST 5).

Here, as shown in fig. 5 (e), a tool T which can be fitted into the V-shaped groove 43V of the engaging pawl 43 (not shown in fig. 5 (e) and see fig. 2) is inserted in the direction indicated by the arrow m8, and as shown in fig. 5 (f), the joining tool 40 is pressed against the 1 st member 10 while rotating around the central axis z1 as indicated by the arrow m 9. Then, the metal bolt 30 is screwed into the 2 nd inner diameter portion 41b forcibly while tapping the 2 nd inner diameter portion 41b made of resin softer than metal on the other end side of the 1 ST inner diameter portion 41a, whereby the outer side of the 2 nd inner diameter portion 41b is pushed open in the direction indicated by the arrow m10, that is, in the radial direction, and simultaneously the engaging tool 40 is fitted into the engaging hole 21 in the direction indicated by the arrow m11 (step ST 6).

When the engaging tool 40 is sufficiently fitted into the engaging hole 21 and the engaging stepped portion 43b of the engaging claw portion 43 is engaged with the spot facing portion 21b, the tool T is pulled out from the V-shaped groove 43V, and the engaging operation is terminated as shown in fig. 5 g (step ST 7). As can be seen from fig. 5 (g), the second end of the bolt 30 is radially pushed open in the direction indicated by the arrow m10 outside the 2 nd inner diameter portion 41 b.

As described above, the 2 nd inner diameter portion 41b having substantially the same diameter as the 1 st inner diameter portion 41a is extended from the boundary with the 1 st inner diameter portion 41a to one end side of the engaging claw portion 43, so that when the outer side of the 2 nd inner diameter portion 41b is pressed open in the radial direction by the entrance of the other end side of the bolt 30, the frictional force between the engaging hole 21 and the tool 40 is increased, and the engagement between the engaging claw portion 43 and the spot facing portion 21b is also strengthened. Therefore, unlike the joining structure shown in fig. 7 in which only the head portion 130a of the screw 130 is fitted into each of the engaging claw portions 143, the joining force can be enhanced.

Further, when the joining structure of embodiment 1 is used for an assembled furniture, an assembled furniture in which the joining force is reinforced can be provided.

< summary >

As described above, according to embodiment 1, the present invention includes: a step ST1 of inserting one end of bolt 30 into hole 11 of member 110 and projecting the other end of bolt 30 from hole 11; step ST2, screwing the other end of the bolt 30 protruding from the hole 11 into the 1 ST inner diameter portion 41a provided at one end of the joining tool 40; steps ST3 and ST4, forcibly fitting 3 spring-like engaging claw portions 43, each provided at the other end side of the joining tool 40 in a separated manner along the circumferential direction of the cylinder, from one end of the engaging hole 21 penetrating through the 2 nd member 20 to elastically deform the engaging claw portions 43, and causing the engaging claw portions 43 to reach the other end of the engaging hole 21 to elastically return the engaging claw portions 43; in step ST6, the other end of the bolt 30 screwed into the 1 ST inner diameter part 41a is forcibly screwed into the 2 nd inner diameter part 41b connected to the 1 ST inner diameter part 41a and formed toward the other end side of the joining tool 40 by the tool T, thereby pressing the outer side of the 2 nd inner diameter part 41b radially apart. Therefore, the following effects can be obtained: the frictional force between the engaging hole 21 and the engaging tool 40 is increased, and the engagement between the engaging claw portion 43 and the spot facing portion 21b can be enhanced.

Further, according to embodiment 1, since the tapered portion 21a that gradually narrows from one end of the engagement hole 21 to the other end is provided at one end of the engagement hole 21 in the 2 nd member 20, the following effects can be obtained: in steps ST3 and ST4, the operation of fitting the adapter 40 into the engagement hole 21 can be performed more easily by the tapered portion 21 a.

Furthermore, according to embodiment 1, in the 2 nd member 20, the counter-sunk portion 21b for embedding the engaging claw portion 43 in the 2 nd member 20 is provided at the other end of the engaging hole 21, and the engaging claw portion 43 is engaged with the counter-sunk portion 21b at the other end of the engaging hole 21 in step ST6, so that the following effects are obtained: since the engaging claw portion 43 is embedded in the 2 nd member 20 and does not protrude any more, the appearance of the joint is improved and the safety is improved.

Further, according to embodiment 1, since the joint structure for joining the 1 st member 10 and the 2 nd member 20 by the bolt 30 and the joint tool 40 is provided at least in a partial structure of the assembled furniture, the following effects can be obtained: can provide assembled furniture in which the joining force is reinforced.

< modification example >

In the description of fig. 3 to 5, the case where the 2 nd member 20 and the 1 st member 10 disposed at the lower portion are joined from the upper portion is exemplified, but embodiment 1 is not limited thereto, and the 1 st member 10 and the 2 nd member 20 may be disposed on the left and right sides for joining. At this time, although there is essentially no difference, the steps are slightly different from those of the bonding method of fig. 3.

That is, as shown in fig. 6 a, when the 1 ST member 10 to which the joining tool 40 is temporarily fixed is disposed on the left side and the 2 nd member 20 is disposed on the right side to join the two members, if the engaging claw 43 is brought into the elastically returning state by performing the operations at steps ST1 to ST4 in fig. 3 as in the case shown in fig. 5, the 2 nd member 20 does not fall to the position of the 1 ST member 10 by its own weight and comes into contact with the 1 ST member 10, and therefore the operation at step ST5 is not performed and the process proceeds to step ST6 (fig. 6 b).

Next, as shown in fig. 6 (c), when the other end side of the bolt 30 is screwed into the 2 nd inner diameter portion 41b by the tool T, the 2 nd member 20 approaches the 1 st member 10 in the same direction as the joining tool 40. In this manner, the same joining as in the case shown in fig. 5 can be performed.

In the explanation of fig. 3 to 5, the number of the engaging claw portions 43 formed on the other end side of the joining tool 40 is set to 3, but embodiment 1 is not limited thereto, and can be implemented as long as the number of the engaging claw portions 43 is at least 2 or more.

Further, the material of the bonding tool 40 is preferably resin, but the present embodiment 1 is not limited thereto, and may be implemented even with metal. The material of the 1 st and 2 nd members 10 and 20 may be wood, resin, or the like, but may be made of other metals such as iron and aluminum.

In addition, the operation of forcibly inserting the other end side of the bolt 30 into the 2 nd inner diameter portion 41b may be an operation other than the operation of forcibly screwing the other end side of the bolt 30 into the 2 nd inner diameter portion 41b while tapping the 2 nd inner diameter portion 41 b. That is, the other end of the bolt 30 may be forced into the 2 nd inner diameter portion 41b and the state in which the outer side of the 2 nd inner diameter portion 41b is pressed in the radial direction may be maintained. The tool T is not an essential component, and may be another type other than the tool T as long as the other end of the bolt 30 can be forcibly inserted into the 2 nd inner diameter portion 41 b.

Further, both the length α of the 1 st inner diameter portion 41a and the length β of the 2 nd inner diameter portion 41b can be changed as appropriate. For example, by further extending the length β of the 2 nd inner diameter portion 41b in fig. 2 (g) toward the other end side, the joining force can be further enhanced.

When embodiment 1 is applied to the assembled furniture, the operations shown in (a) to (c) of fig. 4 (steps ST1 and ST2) may be performed by the user himself or herself, or may be performed on the production line before factory shipment.

Description of the reference numerals

10 item 1

11 holes

20 nd 2 nd part

21 engaging hole

21a taper part

21b spot-facing part

30 bolt (fastening body)

40 jointing tool

41a 1 st inner diameter part

41b 2 nd inner diameter part

43 engaging claw part

43a taper part

43b engaging step portion

43v V shaped groove

Arrow m 1-m 11

T tool

x1 and x2 diameters

z1 center shaft

The claims (modification according to treaty clause 19)

1. A joint construction, characterized in that,

the 1 st member is joined to the 2 nd member having the engaging hole formed therein by using a substantially rod-shaped fixing body and a substantially cylindrical joining tool,

one end of the fixing body is inserted into the 1 st part, and the other end of the fixing body protrudes from the 1 st part,

the bonding tool has, at one end thereof:

a 1 st inner diameter portion into which the other end of the fastening body protruding from the 1 st member is screwed; and

a 2 nd inner diameter portion connected to the 1 st inner diameter portion and formed toward the other end side of the adapter, wherein an outer side of the 2 nd inner diameter portion is pressed in a radial direction when the other end of the fastening body screwed into the 1 st inner diameter portion is forcibly inserted into the 2 nd inner diameter portion,

the bonding tool is provided with at the other end thereof

A plurality of engaging claw portions provided separately from each other in a circumferential direction of the cylinder, wherein the engaging claw portions are engaged with the other end of the engaging hole when the engaging claw portions are forcibly fitted from one end of the engaging hole to the other end of the engaging hole and the other end of the fixing body is forcibly inserted into the 2 nd inner diameter portion,

after the engaging claw portion reaches the other end of the engaging hole, the other end of the fastening body screwed into the 1 st inner diameter portion is forced into the 2 nd inner diameter portion by rotating the adapter about its central axis.

2. The joining construction of claim 1,

the 2 nd member includes a tapered portion at one end of the engagement hole, the tapered portion gradually narrowing from the one end of the engagement hole to the other end of the engagement hole.

3. The joining construction of claim 1,

the 2 nd member is provided with a spot facing portion at the other end of the engaging hole for embedding the engaging claw portion in the 2 nd member,

the engaging claw portion is engaged with the spot facing portion at the other end of the engaging hole.

4. A method of joining, characterized in that,

the 1 st member is joined to the 2 nd member having the engaging hole formed therein by using a substantially rod-shaped fixing body and a substantially cylindrical joining tool,

the joining method includes:

a 1 st step of inserting one end of the fixing body into the 1 st member and projecting the other end of the fixing body from the 1 st member;

a 2 nd step of screwing the other end of the fastening body protruding from the 1 st member into a 1 st inner diameter portion provided at one end of the joining tool;

a 3 rd step of forcibly fitting the plurality of engaging claw portions provided at the other end of the engaging tool in a manner separated from each other in the circumferential direction of the cylinder from one end of the engaging hole to the other end of the engaging hole; and

and a 4 th step of rotating the adapter about its center axis to force the other end of the fastening body screwed into the 1 st inner diameter portion into a 2 nd inner diameter portion formed on the 1 st inner diameter portion and toward the other end side of the adapter, thereby radially pressing the outside of the 2 nd inner diameter portion open and engaging the other end of the engaging hole with the engaging claw portion.

5. The joining method according to claim 4,

in the 2 nd member, a tapered portion that gradually narrows from one end of the engagement hole to the other end is provided at one end of the engagement hole.

6. The joining method according to claim 4,

the 2 nd member is provided with a spot facing portion at the other end of the engaging hole for embedding the engaging claw portion in the 2 nd member,

in the 4 th step, the engagement claw portion is engaged with the spot facing portion at the other end of the engagement hole.

7. An assembled furniture, characterized in that at least a part of the assembled furniture is provided with a joint construction according to any of claims 1-3.

Claims (7)

1. A joint construction, characterized in that,

the 1 st member is joined to the 2 nd member having the engaging hole formed therein by using a substantially rod-shaped fixing body and a substantially cylindrical joining tool,

one end of the fixing body is inserted into the 1 st part, and the other end of the fixing body protrudes from the 1 st part,

the bonding tool has, at one end thereof:

a 1 st inner diameter portion into which the other end of the fastening body protruding from the 1 st member is screwed; and

a 2 nd inner diameter portion connected to the 1 st inner diameter portion and formed toward the other end side of the adapter, wherein an outer side of the 2 nd inner diameter portion is pressed in a radial direction when the other end of the fastening body screwed into the 1 st inner diameter portion is forcibly inserted into the 2 nd inner diameter portion,

the engaging tool has a plurality of engaging claw portions provided at the other end thereof, each of which is provided separately in the circumferential direction of the cylinder, wherein the engaging claw portions are engaged with the other end of the engaging hole when the engaging claw portions are forcibly fitted from the one end of the engaging hole to the other end of the engaging hole and the other end of the fixing body is forcibly inserted into the 2 nd inner diameter portion.

2. The joining construction of claim 1,

the 2 nd member includes a tapered portion at one end of the engagement hole, the tapered portion gradually narrowing from the one end of the engagement hole to the other end of the engagement hole.

3. The joining construction of claim 1,

the 2 nd member is provided with a spot facing portion at the other end of the engaging hole for embedding the engaging claw portion in the 2 nd member,

the engaging claw portion is engaged with the spot facing portion at the other end of the engaging hole.

4. A method of joining, characterized in that,

the 1 st member is joined to the 2 nd member having the engaging hole formed therein by using a substantially rod-shaped fixing body and a substantially cylindrical joining tool,

the joining method includes:

a 1 st step of inserting one end of the fixing body into the 1 st member and projecting the other end of the fixing body from the 1 st member;

a 2 nd step of screwing the other end of the fastening body protruding from the 1 st member into a 1 st inner diameter portion provided at one end of the joining tool;

a 3 rd step of forcibly fitting the plurality of engaging claw portions provided at the other end of the engaging tool in a manner separated from each other in the circumferential direction of the cylinder from one end of the engaging hole to the other end of the engaging hole; and

and a 4 th step of forcing the other end of the fastening body screwed into the 1 st inner diameter portion into a 2 nd inner diameter portion formed to be continuous with the 1 st inner diameter portion and to face the other end side of the adapter, thereby radially pressing the outer side of the 2 nd inner diameter portion open and engaging the other end of the engaging hole with the engaging claw portion.

5. The joining method according to claim 4,

in the 2 nd member, a tapered portion that gradually narrows from one end of the engagement hole to the other end is provided at one end of the engagement hole.

6. The joining method according to claim 4,

the 2 nd member is provided with a spot facing portion at the other end of the engaging hole for embedding the engaging claw portion in the 2 nd member,

in the 4 th step, the engagement claw portion is engaged with the spot facing portion at the other end of the engagement hole.

7. An assembled furniture, characterized in that at least a part of the assembled furniture is provided with a joint construction according to any of claims 1-3.