HK1237018B - Joining structure, joining method, and assembled furniture - Google Patents

Description

Joint structure, joint method and assembled furniture

Technical Field

The present invention relates to a joining structure and a joining method for simply and firmly joining two parts. In addition, the present invention relates to modular furniture assembled by joining a plurality of parts separately.

Background Art

FIG7 is a cross-sectional view of a conventional joint structure disclosed in Patent Document 1. In FIG7 , 110 is a first member, 120 is a second member having an engaging hole 121 therethrough, 130 is a screw having a head 130a, and 140 is a joint tool.

In addition, in the coupling 140, 141 is a roughly cylindrical mounting cylinder, 142 is a gap, 143 is a plurality of engaging claws formed on the outside of the mounting cylinder 141 with the gap 142 separated therefrom, and 143a and 143b are a tapered portion and an engaging step portion formed on each engaging claw 143.

First, as shown in FIG7 (a), the screw 130 inserted into the mounting cylinder 141 is rotated about the central axis z2 as indicated by the arrow m12, and the screw 130 is screwed into the first component 110 to a depth such that the head 130a does not fit between the engaging claws 143, thereby temporarily fixing the coupling 140.

Next, as shown in FIG7(b), the second component 120 is brought closer to the first component 110 in the direction indicated by the arrow m13, and the engaging tool 140 is forcibly inserted into the engaging hole 121. As a result, the engaging hole 121 presses the tapered portion 143a as indicated by the arrow m14, and the engaging claw portion 143 is elastically deformed toward the gap 142.

7(c), when the engagement hole 121 is engaged with the outer surface of the base end of the coupling 140, the engagement claw 143 elastically returns in the direction indicated by the arrow m15, and the engagement step 143b engages with the engagement hole 121. Finally, the screw 130 is again rotated about the central axis z2 as indicated by the arrow m12 to be screwed into the first component 110. When the bottom surface of the head 130a contacts the mounting cylinder 141 and the head 130a is embedded between the engagement claws 143, the engagement between the first component 110 and the second component 120 is completed.

As shown above, the conventional joint structure achieves the desired joint by forcibly fitting the joint tool 140 temporarily fixed to the first component 110 into the engaging hole 121 of the second component 120. In particular, since the head 130a of the screw 130 is inserted between the engaging claws 143, the engaging claws 143 are prevented from elastically deforming toward the gap 142 and causing the joint to dislocate.

Prior art literature

Patent Literature

Patent Document 1: Japanese Utility Model Patent No. 1749899 (Ji Kosho 63-013724)

Summary of the Invention

Problems to be solved by the invention

The conventional joint structure has the above-mentioned structure, in which the head of the screw is simply inserted between the engaging claws, and thus has a problem of weak joint force.

The present invention is developed to solve the above-mentioned problems, and its object is to provide a joining structure and a joining method capable of enhancing the joining force.

In addition, another object of the present invention is to provide assembled furniture with enhanced joining force.

Solutions to the problem

and a second end of the fastener that is adapted to engage the first end of the second member and to engage the second end of the second member when the fastener is engaged.

Effects of the Invention

By adopting the above configuration, it is possible to obtain an effect of strengthening the joining force.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective view showing the appearance of a bolt and a joint tool used in a joint structure according to a first embodiment of the present invention.

FIG2-1 is a structural diagram (part 1) of the joining tool shown in FIG1 .

FIG2-2 is a structural diagram (part 2) of the joining tool shown in FIG1 .

FIG2-3 is a structural diagram of the joining tool shown in FIG1 (part 3).

FIG3 is a flowchart showing the steps of the bonding method according to the first embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view showing a state of operation according to the joining method of FIG. 3 .

FIG5-1 is an enlarged cross-sectional view (part 1) showing the operation according to the joining method of FIG3.

FIG5-2 is an enlarged cross-sectional view (part 2) of the operation according to the joining method of FIG3.

FIG5-3 is an enlarged cross-sectional view (part 3) of the operation according to the joining method of FIG3.

FIG5-4 is an enlarged cross-sectional view (part 4) of the operation according to the joining method of FIG3.

FIG6-1 is an enlarged cross-sectional view (part 1) of a portion of the operation performed according to a bonding method that is partially different from that of FIG3 .

FIG6-2 is an enlarged cross-sectional view (part 2) of a portion of the operation performed according to a bonding method that is partially different from that of FIG3 .

FIG7 is a cross-sectional view of the structure of a conventional joint structure.

DETAILED DESCRIPTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Herein, identical or equivalent components in the various drawings are given identical or equivalent reference numerals.

Implementation Method 1

<Structure>

FIG1 is a perspective view of the bolt and joint used in the joint structure according to Embodiment 1 of the present invention. FIG2 is a structural diagram of the joint shown in FIG1 , with FIG2(a) being a left side view, FIG2(b) being a front view, FIG2(c) being a right side view, FIG2(d) being a rear view, FIG2(e) being a top view, FIG2(f) being a bottom view, FIG2(g) being a cross-sectional view taken along line A-A, and FIG2(h), (i), and (j) being cross-sectional views taken along lines B-B, C-C, and D-D, respectively. Line B-B rotated 120° about the central axis of the joint becomes line C-C, and rotated 240° becomes line D-D.

1 and 2, 30 is a substantially rod-shaped metal bolt (fastening body), and 40 is a substantially cylindrical resin joint. The joint 40 is used together with the bolt 30 to easily and firmly join a plurality of components constituting assembled furniture.

In addition, in the coupling 40 shown in Figures 1 and 2, 41 is a roughly cylindrical mounting cylinder portion arranged on one end side of the coupling 40, 41a and 41b are the first inner diameter portion and the second inner diameter portion, respectively, 43 is three spring-shaped engaging claw portions arranged separately along the circumferential direction of the cylinder on the other end side of the coupling 40, 43a and 43b are tapered portions and engaging step portions respectively formed on the other end side of each engaging claw portion 43, and 43v is a V-shaped groove formed on the inner circumferential side of the engaging claw portion 43.

Here, the first inner diameter portion 41a is a portion having threads formed on the inner circumference, into which the other end of the bolt 30 is screwed, and extends a length α from one end of the fastener 40. Comparing FIG2(h) to FIG2(j) shows that, except for the seemingly different helical threads of the first inner diameter portion 41a, the other portions have the same shape.

On the other hand, referring to Figures 2(g) to 2(j), the second inner diameter portion 41b is provided in connection with the first inner diameter portion 41a. That is, the second inner diameter portion 41b extends from the boundary between the second inner diameter portion 41b and the first inner diameter portion 41a toward the other end of the coupling 40 to one end of the engaging claw portion 43 (the root of the engaging claw portion 43 connected to the mounting cylinder 41), and the extension length is β. In addition, the second inner diameter portion 41b is substantially the same diameter as the first inner diameter portion 41a, but no threads are formed on the inner circumference.

<Join>

FIG3 is a flowchart showing the steps of the bonding method according to the first embodiment of the present invention, and FIG4 and FIG5 are enlarged cross-sectional views showing the bonding method of FIG3 during operation.

First, as shown in FIG4(a), the bolt 30 is rotated about the central axis z1 as indicated by the arrow m1 while being moved in the direction indicated by the arrow m2, thereby inserting one end of the bolt 30 into the hole 11 formed in the rectangular first member 10 (step ST1). The hole 11 is formed shorter than the length of the bolt 30. Therefore, as shown in FIG4(b), after the bolt 30 is inserted into the hole 11, the other end of the bolt 30 protrudes from the hole 11 of the first member 10.

Next, the fastener 40 in FIG4(b) is rotated about the central axis z1 as indicated by arrow m3 while being moved toward the direction indicated by arrow m4, thereby screwing the other end of the bolt 30 into the first inner diameter portion 41a formed on one end of the fastener 40, thereby temporarily securing the fastener 40 (step ST2). As described above, unlike the first inner diameter portion 41a, the second inner diameter portion 41b is not threaded. Therefore, as shown in FIG4(c), after the other end of the bolt 30 is screwed into the first inner diameter portion 41a for a length α, it temporarily stops at the boundary between the first inner diameter portion 41a and the second inner diameter portion 41b.

Next, as shown in FIG5(a), the rectangular parallelepiped second member 20 is moved in the direction indicated by arrow m5 toward the first member 10, thereby forcibly inserting the engaging tool 40, which is temporarily fixed to the bolt 30 on the first member 10, into the engaging hole 21 through the tapered portion 21a at one end of the engaging hole 21 penetrating the second member 20 (step ST3). Because the diameter x2 of the engaging step 43b is larger than the diameter x1 of the engaging cylinder 41 and the engaging hole 21, the spring-shaped engaging claw 43 is pressed against the inner circumference of the engaging hole 21 in the direction indicated by arrow m6, thereby elastically deforming inward, as shown in FIG5(b).

When the second component 20 is further moved in the direction indicated by the arrow m5 so that the engaging step portion 43b reaches the countersunk portion 21b of the engaging hole 21, since the diameter of the countersunk portion 21b is x2, as shown in (c) of Figure 5, the engaging claw portion 43 will elastically reset in the direction indicated by the arrow m7, that is, outward (step ST4).

The second member 20 further advances in the direction indicated by the arrow m5 due to its own weight and stops when it contacts the first member 10 as shown in FIG. 5( d ). The other end of the engaging claw 43 protrudes from the countersunk portion 21 b of the engaging hole 21 (step ST5 ).

Here, as shown in FIG5(e), a tool T that can be engaged with the V-shaped groove 43v (not shown in FIG5(e), refer to FIG2) of the engaging claw portion 43 is inserted in the direction indicated by the arrow m8, and as shown in FIG5(f), the engaging tool 40 is rotated about the central axis z1 as indicated by the arrow m9 while being pressed against the first member 10. As a result, the other end of the metal bolt 30 screwed into the first inner diameter portion 41a taps the second inner diameter portion 41b made of resin, which is a material softer than metal, and is forcibly screwed into the second inner diameter portion 41b, thereby squeezing the outer side of the second inner diameter portion 41b in the direction indicated by the arrow m10, that is, in the radial direction. At the same time, the engaging tool 40 is inserted into the engaging hole 21 in the direction indicated by the arrow m11 (step ST6).

After the engaging tool 40 is fully inserted into the engaging hole 21 and the engaging step 43b of the engaging claw 43 is engaged with the countersunk portion 21b, the tool T is removed from the V-shaped groove 43v, and the joining operation is completed as shown in FIG5(g) (step ST7). As can be seen from FIG5(g), the outer side of the second inner diameter portion 41b is now radially squeezed open by the other end of the bolt 30 in the direction indicated by the arrow m10.

As described above, the second inner diameter portion 41b, which has a diameter substantially equal to that of the first inner diameter portion 41a, extends from its boundary with the first inner diameter portion 41a to one end of the engaging claw portion 43. Therefore, when the outer side of the second inner diameter portion 41b is radially squeezed open by the entry of the other end of the bolt 30, the friction between the engaging hole 21 and the coupling 40 is increased, and the engagement between the engaging claw portion 43 and the countersunk portion 21b is also strengthened. Therefore, unlike the coupling structure shown in FIG7 , in which only the head 130a of the screw 130 is inserted between the engaging claw portions 143, this structure can strengthen the coupling force.

Furthermore, by using the joining structure of the first embodiment for assembled furniture, assembled furniture with enhanced joining force can be provided.

Summary

As described above, according to the present embodiment 1, there are the following steps: step ST1, inserting one end of the bolt 30 into the hole 11 of the first component 10 so that the other end of the bolt 30 protrudes from the hole 11; step ST2, screwing the other end of the bolt 30 protruding from the hole 11 into the first inner diameter portion 41a provided at one end of the coupling 40; steps ST3 and ST4, respectively, moving three spring-shaped engaging claws 43 provided on the other end side of the coupling 40 in a separated shape along the circumferential direction of the cylinder, from the first inner diameter portion 41a provided at the second inner diameter portion 41b of the coupling 40. One end of the engaging hole 21 of the second component 20 is forcibly inserted into the engaging hole 21, causing the engaging claw 43 to elastically deform. The engaging claw 43 then reaches the other end of the engaging hole 21, causing the engaging claw 43 to elastically return to its original position. In step ST6, the other end of the bolt 30, which is screwed into the first inner diameter portion 41a, is forcibly screwed into the second inner diameter portion 41b, which is connected to the first inner diameter portion 41a and faces the other end of the coupling 40. This radially compresses the outer side of the second inner diameter portion 41b. This increases the friction between the engaging hole 21 and the coupling 40, and strengthens the engagement between the engaging claw 43 and the countersunk portion 21b.

In addition, according to this embodiment 1, with respect to the second component 20, a tapered portion 21a is provided at one end of the engaging hole 21, which gradually narrows from the one end of the engaging hole 21 toward the other end, so that the following effect can be obtained: in steps ST3 and ST4, the operation of embedding the coupling 40 into the engaging hole 21 can be more easily performed through the tapered portion 21a.

Furthermore, according to the present embodiment 1, with respect to the second component 20, a countersunk portion 21b is provided at the other end of the engaging hole 21 for embedding the engaging claw portion 43 into the second component 20, and in step ST6, the engaging claw portion 43 is engaged with the countersunk portion 21b at the other end of the engaging hole 21, thereby obtaining the following effect: the engaging claw portion 43 is embedded in the second component 20 and no longer protrudes, so that not only the joint is beautiful but also the safety is improved.

Furthermore, according to the first embodiment, at least a portion of the assembled furniture structure includes a joint structure for joining the first component 10 and the second component 20 by the bolts 30 and the jointer 40, thereby providing assembled furniture with enhanced joining force.

<Modification>

While the description of Figures 3 to 5 illustrates the case of joining the second component 20 to the first component 10 disposed below from above, this embodiment is not limited thereto, and the first component 10 and the second component 20 may also be joined by arranging them side by side. In this case, while there is no essential difference, the steps of the joining method are slightly different from those of Figure 3.

That is, as shown in (a) of Figure 6, if the first component 10 temporarily fixed with the coupling 40 is arranged on the left and the second component 20 is arranged on the right to couple the two, then when the operations of steps ST1 to ST4 in Figure 3 are performed in the same manner as in the case shown in Figure 5 and the engaging claw portion 43 is made to be in an elastic reset state, since the second component 20 will not drop to the position of the first component 10 due to its own weight and contact the first component 10, the operation of step ST5 is not performed and step ST6 ((b) of Figure 6) is entered.

6( c ), when the other end of the bolt 30 is screwed into the second inner diameter portion 41 b using the tool T, the second member 20 and the joining tool 40 are moved toward the first member 10. In this manner, the same joining as in the case shown in FIG.

3 to 5 , the number of the engaging claw portions 43 formed on the other end side of the fastener 40 is set to three, but the first embodiment is not limited thereto, and any other embodiment can be implemented as long as the number of the engaging claw portions 43 is at least two.

Furthermore, the material of the joint 40 is preferably resin, but this embodiment 1 is not limited thereto and can be implemented even with metal. The material of the first and second members 10 and 20 can be wood, resin, etc., but can also be implemented even with other metals such as iron and aluminum.

Furthermore, the action of forcing the other end of the bolt 30 into the second inner diameter portion 41b may be performed by a different method than forcing the other end of the bolt 30 into the second inner diameter portion 41b while tapping the second inner diameter portion 41b. In other words, any method that can force the other end of the bolt 30 into the second inner diameter portion 41b while maintaining the outer side of the second inner diameter portion 41b radially squeezed open will suffice. The tool T is not a required component; any method other than the tool T may be used as long as it can force the other end of the bolt 30 into the second inner diameter portion 41b.

Furthermore, the length α of the first inner diameter portion 41a and the length β of the second inner diameter portion 41b can be changed as appropriate. For example, by further extending the length β of the second inner diameter portion 41b in FIG. 2( g ) toward the other end, the joining force can be further enhanced.

Furthermore, if the first embodiment is applied to assembling furniture, the operations shown in (a) to (c) of FIG. 4 (steps ST1 and ST2 ) can be performed by the user himself or on the production line before shipment from the factory.

Description of Reference Numerals

10 Part 1

11 holes

20 Part 2

21 snap-fit hole

21a cone

21b Countersink

30 bolts (fixed body)

40 Jointing tools

41a First inner diameter portion

41b Second inner diameter portion

43 Engaging claw

43a cone

43b Engaging step

43v V-groove

m1～m11 arrow

T Tools

x1, x2 diameter

z1 center axis

Claims (7)

1. A joining structure, Using a roughly rod-shaped fastener and a roughly cylindrical coupling, the first component is joined to the second component, which has a through-hole. One end of the fixing body is inserted into the first component, and the other end protrudes from the first component. The coupling has at one end: A first inner diameter portion, into which the other end of the fastener protruding from the first component is screwed; and The second inner diameter portion, which is connected to the first inner diameter portion and formed toward the other end of the connector, wherein when the other end of the fastener, which is screwed into the first inner diameter portion, is forced into the second inner diameter portion, the outer side of the second inner diameter portion is squeezed open radially. The coupling has at its other end: Multiple engaging claws are arranged separately along the circumference of the cylinder. Its features are, When the engaging claw is forcibly inserted 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 second inner diameter portion, the engaging claw engages with the other end of the engaging hole. After the engaging claw reaches the other end of the engaging hole, the other end of the fastener screwed into the first inner diameter portion is forced into the second inner diameter portion by rotating the engagement tool around its central axis. 2. The joining structure according to claim 1, characterized in that, In the second component, one end of the engagement hole has a tapered portion that gradually narrows from that end to the other end. 3. The joining structure according to claim 1, characterized in that, In the second component, a countersunk portion is provided at the other end of the engaging hole for embedding the engaging claw portion into the second component. The engaging claw engages with the counterspindle at the other end of the engaging hole. 4. A joining method, characterized in that, Using a roughly rod-shaped fastener and a roughly cylindrical coupling, the first component is joined to the second component, which has a through-hole. The joining method includes: Step 1: Insert one end of the fastener into the first component and make the other end of the fastener protrude from the first component; Step 2: Screw the other end of the fastener protruding from the first component into the first inner diameter portion located at one end of the connector; Step 3 involves forcibly inserting multiple engaging claws, which are separated along the circumferential direction of the cylinder and located at the other end of the coupling, into the engaging hole from one end and extending to the other end; and Step 4: By rotating the coupling around its central axis, the other end of the fixed body screwed into the first inner diameter portion is forced into the second inner diameter portion formed on the other end side of the coupling, which is connected to the first inner diameter portion and faces the other end of the coupling, thereby squeezing the outer side of the second inner diameter portion radially open and engaging the other end of the engaging hole with the engaging claw portion. 5. The joining method according to claim 4, characterized in that, For the second component, a tapered portion is provided at one end of the engagement hole, which gradually narrows from that end to the other end. 6. The joining method according to claim 4, characterized in that, For the second component, a countersunk portion is provided at the other end of the engaging hole to embed the engaging claw portion into the countersunk portion of the second component. In step 4, the engaging claw engages with the counterspindle at the other end of the engaging hole. 7. An assembled furniture, characterized in that at least a portion of the assembled furniture has the joining structure as described in any one of claims 1 to 3.