Method for producing a component

Abstract

To provide a method for manufacturing a component having a bending frame part which contributes to at least suitable appearance of furniture and is excellent in rigidity.SOLUTION: The method includes a frame member preparing step S1, a notch forming step S2, a linear frame portion bending step S3 of bending a portion in the vicinity of a notch holding a connection state between one portion and the other portion to bring a first notch end surface of the one portion and a second notch end surface of the other portion facing a space formed by the notch into contact with or close to each other, and a bent state fixing step S4.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing parts used in furniture. [Background technology]

[0002] BACKGROUND ART Conventionally, there has been known a bending method for a square pipe, in which the square pipe is bent by pressing it with a pressing metal fitting (see, for example, Patent Document 1).

[0003] In this type of processing method, the outside of the bent portion of the square pipe is stretched significantly in the longitudinal direction, and the resulting pipe inevitably takes on a partially curved arc shape.

[0004] That is, in the conventional processing method, the curved portions of the square pipe after bending are unavoidably visible, and therefore, in the conventional processing method, the curved portions of the square pipe after bending are visible, which can detract from the desirable impression of the external appearance.

[0005] Furthermore, with conventional processing methods, the outside of the bent portion is significantly stretched in the longitudinal direction, resulting in not only a thinner wall at the stretched portion but also a shorter radial dimension (i.e., pipe diameter) at the bent portion compared to the other portions, which results in the rigidity of the bent portion being weaker than the other portions.

[0006] The above circumstances are not limited to square pipes, but also apply to so-called round pipes and solid frame materials in general. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 11-077172 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in light of the above circumstances, and aims to provide a method for manufacturing a part having a bent frame portion that not only contributes to a desirable appearance of furniture but also has excellent rigidity. [Means for solving the problem]

[0009] That is, the present invention has the following configuration.

[0010] The invention described in claim 1 is a method for manufacturing a part used in furniture, the method comprising: a frame material preparation step of preparing a frame material having a linear frame portion whose imaginary axis line is linear; a notch formation step of forming a notch between one portion and the other portion of the linear frame portion while maintaining a connection between the one portion and the other portion in the longitudinal direction of the linear frame portion; and a linear frame portion bending step of bending a portion near the notch that maintains the connection between the one portion and the other portion, so that a first notched end surface of the one portion facing a space formed by the notch comes into contact with or is close to a second notched end surface of the other portion. and a bending state fixing step of fixing the one part and the other part by a fixing means so that the first notched end surface and the second notched end surface are maintained in an abutting or close proximity state, thereby obtaining the part in which a bending frame part is formed by bending the straight frame part, wherein the bending frame part has the one part having a first axis line that extends linearly and the other part having a second axis line that extends linearly in a direction different from the first axis line, and the first axis line and the second axis line intersect.

[0011] A second aspect of the present invention is the method for manufacturing a component according to the first aspect, wherein the notch formed in the notch forming step is wedge-shaped.

[0012] The invention described in claim 3 is the method of manufacturing a component described in claim 1, wherein the frame material is made of metal or synthetic resin, and the fixing means is welding.

[0013] The invention described in claim 4 is the method for manufacturing a part described in claim 1, in which the frame material is cylindrical or rectangular tubular.

[0014] The invention described in claim 5 is a method for manufacturing a part described in claim 1, in which the angle formed by the first axis line and the second axis line in the bending frame portion is set to a value greater than 90° and less than 180°.

[0015] The invention described in claim 6 is a method for manufacturing a part described in claim 4, wherein the furniture is a chair, the part constitutes the leg frame of the chair, the other part is arranged below the one part, and is fitted onto a columnar mounting part provided on a grounding member.

[0016] The invention described in claim 7 is a method for manufacturing a part described in claim 4, wherein the furniture is furniture with a tabletop, the part constitutes a leg frame of the furniture with a tabletop, the other part is arranged below the one part, and is fitted externally onto a columnar mounting part provided on a grounding member. [Effects of the Invention]

[0017] As described above, according to the present invention, it is possible to suitably manufacture at least a part having a bent frame portion that not only contributes to a desirable appearance of furniture but also has excellent rigidity. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a side view illustrating one embodiment of the present invention. [Figure 2] 10 is a side view showing the embodiment. [Figure 3] FIG. [Figure 4]FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 10 is a side view showing an application example of a part in the embodiment. [Figure 8] FIG. 10 is a side view showing an application example of a part in the embodiment. [Figure 9] 5A to 5C are explanatory diagrams for explaining a manufacturing process in the embodiment. [Figure 10] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, one embodiment of the present invention will be described with reference to FIGS.

[0020] In this embodiment, the present invention is applied to a method for manufacturing a part P used in furniture.

[0021] More specifically, in this embodiment, the present invention is applied to a manufacturing method for a part P, which constitutes a leg frame of a chair, by processing a cylindrical metal frame material M.

[0022] The manufacturing method of the part P used in furniture includes a frame material preparation process S1, a notch forming process S2 which is carried out after the frame material preparation process S1, a straight frame portion bending process S3 which is carried out after the notch forming process S2, a bending state fixing process S4 which is carried out after the straight frame portion bending process S3, and a finishing process S5 which is carried out finally if necessary.

[0023] Each step will be described in detail below.

[0024] <<Frame material preparation process S1>> The frame material preparation step S1 is to prepare a frame material M having a straight frame portion MS in which the imaginary axis line js is linear.

[0025] In this embodiment, the frame material M prepared in the frame material preparation step S1 is a cylindrical metal material, that is, a so-called round metal pipe material.

[0026] The illustrated frame material M is composed of only straight frame portions MS.

[0027] <<Notch formation process S2>> The notch forming step S2 is to form a notch C between one part 1 and the other part 2 of the straight frame portion MS while maintaining the connection between the one part 1 and the other part 2 in the longitudinal direction of the straight frame portion MS.

[0028] That is, the notch forming process S2 forms a notch C between one part 1 and the other part 2 of the straight frame part MS from a specific side surface side of the specific straight frame part MS to the opposite side surface side thereof, without separating the one part 1 and the other part 2.

[0029] In this embodiment, one part 1 of the straight frame part MS is located above the notch C, and the other part 2 of the straight frame part MS is located below the notch C.

[0030] The notches C formed in the notch forming step S2 are wedge-shaped. In this embodiment, the wedge-shaped notches C in the linear frame portions MS are formed by laser cutting.

[0031] When the notch C is formed by laser cutting, a first notch end face m1 that faces the space sp formed by the notch C appears in one part 1, and a second notch end face m2 that faces the space sp formed by the notch C appears in the other part 2.

[0032] The first notched end surface m1 and the second notched end surface m2 are formed so as to be positioned in a direction gradually approaching each other from the open side of the notch C toward a neighborhood portion 3 described later.

[0033] <<Straight frame partial bending process S3>> The straight frame portion bending process S3 bends the portion 3 adjacent to the notch C that maintains the connection between the one part 1 and the other part 2, so that the first notched end face m1 of the one part 1 facing the space sp formed by the notch C and the second notched end face m2 of the other part 2 come into contact with or are close to each other.

[0034] The straight frame partial bending process S3 bends the adjacent portion 3 by changing the position of one portion 1 and the other portion 2 in a predetermined manner so that the first notched end face m1 and the second notched end face m2 abut or come close to each other.

[0035] The bent vicinity 3, that is, the outside of the bent portion, has an angular shape in a side view.

[0036] The vicinity 3 of the notch C is a portion located on the radially opposite side of the straight frame portion MS in which the notch C is formed. The vicinity 3 of the notch C maintains the connection between the one portion 1 and the other portion 2 even after the notch C is formed in the straight frame portion MS.

[0037] In other words, the vicinity 3 of the notch C is a partly arc-shaped portion located between the one part 1 and the other part 2. The circumferential length of the vicinity 3 of the notch C is set to 5 to 40% of the circumference of the frame material M.

[0038] <<Refractive State Fixing Step S4>> The bent state fixing process S4 involves fixing one part 1 and the other part 2 by welding, which is a fixing means, so that the first notched end face m1 and the second notched end face m2 are maintained in abutting or close proximity to each other, thereby obtaining a part P in which a bent frame portion MF is formed by bending the straight frame portion MS.

[0039] 2 and 5, the welding points are indicated by the symbol Y.

[0040] <<Finishing process S5>> In the finishing step S5, the welded portion and its surrounding area of ​​the part P obtained through the bending state fixing step S4 are polished, and the whole part P is painted. <<About part P with bent frame portion MF formed>> The bent frame portion MF obtained by the manufacturing direction of the part P in this embodiment has one part 1 having a first axial line j1 extending in a straight line, and the other part 2 having a second axial line j2 extending in a straight line in a direction different from the first axial line j1, and the first axial line j1 and the second axial line j2 intersect and are continuous.

[0041] More specifically, no curved axis line is interposed between the first axis line j1 of the one part 1 and the second axis line j2 of the other part 2.

[0042] In contrast to this, as illustrated in FIG. 10, in a conventional part Px having a curved portion p1, a curved axis line X exists between one part 1x and the other part 2x.

[0043] That is, in the bending frame portion MF of the present invention, the first axial line j1 of the one part 1 and the second axial line j2 of the other part 2 are continuous (directly connected).

[0044] In addition, the angle (minor angle) formed by the first axis j1 and the second axis j2 in the bending frame portion MF is set to a value greater than 90°. More specifically, the angle formed by the first axis j1 and the second axis j2 in the bending frame portion MF is set to a value greater than 90° and smaller than 180°.

[0045] In addition, when viewed from the side, the refractive frame portion MF is configured so that the outer edge h1 of one part 1 extending linearly in the longitudinal direction meets the outer edge h2 of the other part 2 extending linearly in the longitudinal direction without any curved line, and the inner edge h3 of one part 1 extending linearly in the longitudinal direction meets the inner edge h4 of the other part 2 extending linearly in the longitudinal direction without any curved line.

[0046] The part P on which the bent frame portion MF is formed constitutes the leg frame of the chair. The other part 2 of the bent frame portion MF is disposed below the one part 1 and is fitted onto the pillar-shaped mounting part a1 provided on the caster A, which is the ground contact member.

[0047] When a ground contact member is attached to the tip of the other part 2, the other part 2 is set to assume a position extending perpendicular to the floor surface.

[0048] As explained above, the manufacturing method of the part P used in the furniture according to this embodiment includes a frame material preparation step S1 for preparing a frame material M having a straight frame portion MS whose imaginary axis line js is straight; a notch formation step S2 for forming a notch C between one part 1 and the other part 2 of the straight frame portion MS while maintaining the connection between one part 1 and the other part 2 in the longitudinal direction of the straight frame portion MS; a straight frame portion bending step S3 for bending the portion 3 near the notch C that maintains the connection between the one part 1 and the other part 2 so that the first notched end face m1 of the one part 1 and the second notched end face m2 of the other part 2, which face the space sp formed by the notch C, come into contact with or are close to each other; and a bent state fixation step S4 for fixing the one part 1 and the other part 2 by fixing means so that the first notched end face m1 and the second notched end face m2 are maintained in contact with or are close to each other, thereby obtaining a part P having a bent frame portion MF formed by the bent straight frame portion MS.

[0049] The bending frame portion MF has one part 1 having a first axial line j1 extending linearly, and the other part 2 having a second axial line j2 extending linearly in a direction different from the first axial line j1, and the first axial line j1 and the second axial line j2 intersect.

[0050] Therefore, the manufacturing method of the part P in this embodiment can suitably manufacture a part P having a bent frame portion MF that not only contributes to a desirable appearance of the furniture but also has excellent rigidity.

[0051] That is, as described in the background art of this specification, in the prior art, a portion of the bent pipe material is stretched in the longitudinal direction, which inevitably results in a portion of the wall thickness being thinned after processing. As a result, in the prior art, the pipe material after processing is prone to not only losing strength but also losing its appearance due to the visible thinning and distortion.

[0052] The manufacturing method of the part P in this embodiment results in almost no change in the thickness of the frame material M when bent, thereby completely eliminating the problems that occurred in the prior art.

[0053] Furthermore, in this embodiment, the bending angle of the bending frame portion MF can be clearly set by the shape of the notch C. In the prior art bending process for pipe material, the pipe material is subjected to stress as it tries to return to its initial straight shape, which can easily lead to inaccurate setting of the bending angle. In this embodiment, there is excellent design freedom for forming the other part 2 of the bending frame portion MF perpendicular to the floor surface, which allows for an optimal posture of the ground contact member attached to the other part 2.

[0054] Furthermore, in this embodiment, the straight frame partial bending process S3 bends only a portion of the frame material M, i.e., the portion 3 in the vicinity of the notch C, so that it can be deformed into the desired shape with less force than in the prior art.

[0055] The notch C formed in the notch forming step S2 is wedge-shaped.

[0056] Therefore, the wedge-shaped notch C can suitably form the first notched end face m1 of the one part 1 facing the space sp and the second notched end face m2 of the other part 2. Because the notch C is wedge-shaped, the straight frame portion bending step S3, which is the step subsequent to the notch forming step S2, can be carried out suitably.

[0057] The frame material M is made of metal and is fixed by welding.

[0058] Therefore, the manufacturing method of the component P in this embodiment can be suitably carried out.

[0059] Since the frame material M is cylindrical, the part P obtained by the manufacturing method of the part P in this embodiment has a sharp appearance, that is, a linear and sharp-angled appearance that gives a clean and uncluttered impression.

[0060] The angle (minor angle) formed by the first axis j1 and the second axis j2 in the bending frame portion MF is set to a value greater than 90° and smaller than 180°.

[0061] Therefore, it is possible to provide a manufacturing method for a component P that can be set at a suitable angle to fit a desired location.

[0062] The part P on which the bent frame portion MF is formed constitutes the leg frame of the chair. The other part 2 is disposed below the one part 1 and is fitted onto the pillar-shaped mounting part a1 provided on the caster A, which is the ground contact member.

[0063] This prevents the longitudinal dimension of the other part 2 from being set too large compared to the length of the columnar mounting part a1, which is the part that is fitted into the other part 2, providing excellent design freedom for creating a desirable appearance. When a ground contact member is attached to the tip of the other part 2, the other part 2 is set to assume a position that extends perpendicular to the floor surface.

[0064] That is, in the conventional example, as shown in Fig. 10, it was necessary to form the other part 2x by bending the frame material into a curved shape, and therefore the other part 2x had to be set to a length that would allow the mounting part a1 of the caster A to fit securely within, i.e., a length that took into account a certain amount of excess length. Therefore, in the conventional example, the length of the other part 2x was set to be larger than the actual length that could accommodate the mounting part a1, which was one factor that detracted from the desirable appearance. The present invention can preferably eliminate such a problem.

[0065] The present invention is not limited to the above-described embodiment.

[0066] The frame material may include at least a straight frame portion, and may also include an integral portion in which the imaginary axis line is not linear in addition to the straight frame portion.

[0067] The frame material may be made of synthetic resin.

[0068] The frame material is not limited to a hollow one, but may be a solid one, that is, a cylindrical one or a prismatic one.

[0069] The frame material is not limited to a cylindrical shape, but may be a square tubular shape.

[0070] The fixing means is not limited to welding, but may be, for example, an adhesive, or a pair of halved parts may be attached so as to embrace the bending frame portion from the outside.

[0071] The part on which the bent frame portion is formed may constitute a leg frame of furniture with a tabletop. For example, the other part of the bent frame portion may be disposed below the one part of the bent frame portion and fitted onto a column-shaped mounting portion provided on the grounding member.

[0072] The grounding member is not limited to a caster, but may be, for example, a grounding member B with an adjuster having an attachment portion b1 that is fitted into the other portion 2, as shown in Figure 8, or a grounding member without an adjuster.

[0073] Furthermore, the specific configuration of each part is not limited to the above embodiment, and various modifications are possible within the scope of the present invention. [Explanation of symbols]

[0074] 1...One side 2...Other part 3...Nearby area C...Notch S1...Frame material preparation process S2…Notch formation process S3: Straight frame partial bending process S4: Refractive state fixing process S5...Finishing process M...Frame material MF: Straight frame section MS: Refraction frame part P…Parts

Claims

1. A method for manufacturing a part used in furniture, comprising: a frame material preparation step of preparing a frame material having a straight frame portion whose imaginary axis line is straight; a notch forming step of forming a notch between one end and another end of the linear frame portion while maintaining a connection between the one end and another end in the longitudinal direction of the linear frame portion; a linear frame portion bending step of bending a portion near the notch that maintains the connection between the one portion and the other portion, so that a first notched end surface of the one portion facing the space formed by the notch and a second notched end surface of the other portion come into contact with or are close to each other; a bending state fixing step of fixing the one portion and the other portion by a fixing means so that the first notched end surface and the second notched end surface are maintained in a state of abutting or being close to each other, thereby obtaining the component having a bending frame portion formed by bending the straight frame portion, A method for manufacturing a part used in furniture, wherein the bent frame portion has one part having a first axis line that extends linearly and the other part having a second axis line that extends linearly in a direction different from the first axis line, and the first axis line and the second axis line intersect.

2. 2. The method for manufacturing a part according to claim 1, wherein the notch formed in the notch forming step is wedge-shaped.

3. The frame material is made of metal or synthetic resin, 2. The method for manufacturing a part according to claim 1, wherein said fastening means is welding.

4. 2. The method for manufacturing a part according to claim 1, wherein the frame material is cylindrical or rectangular.

5. 2. The method for manufacturing a component according to claim 1, wherein the angle formed by the first axis line and the second axis line in the bent frame portion is set to a value greater than 90 degrees and smaller than 180 degrees.

6. the furniture is a chair, The part constitutes a leg frame of the chair, 5. The method for manufacturing a component according to claim 4, wherein the other portion is disposed below the one portion and fitted onto a columnar mounting portion provided on the grounding member.

7. The furniture is furniture with a tabletop, The part constitutes a leg frame of furniture with a tabletop, 5. The method for manufacturing a component according to claim 4, wherein the other portion is disposed below the one portion and fitted onto a columnar mounting portion provided on the grounding member.

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