JPH10272032A - Back frame installation method to chair and structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembling, reduce a volume in a packaged condition, and increase a load capacity of a transport means. SOLUTION: In a method of installing a roughly L-shaped back frame 14 to a chair, a horizontal part of the back frame 14 is formed short, it is formed tapered, locking protrusions 16 are on both side surfaces, a second frame 20 formed tapered and having locking grooves 18 in both side surfaces is provided, and the second back frame 20 is locked or journalled to an installation frame of the chair. The locking protrusions 16 are then engaged with the locking grooves 18, and the back frame 14 is installed on the second back frame 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for attaching a back frame to a chair and its structure.

[0002]

2. Description of the Related Art Conventionally, the following method is known as a method of attaching a back frame for attaching a backrest to a chair.

A substantially L-shaped back frame having a long horizontal portion having a length of about 20 cm formed at the lower end of a vertical portion is fixed or pivotally supported on the mounting frame of the chair. Was attached to the chair.

In the case where the back frame is attached to the mounting frame of the chair by fastening, it is impossible to tilt the back frame backward, and in the case where the back frame is mounted to the mounting frame of the chair by pivoting, Tilt backwards is possible.

The back frame is disassembled and detached from the mounting frame of the chair, packed together with the seat, backrest, and legs of the chair, and loaded on a transport means such as a container or a truck for transportation.

[0006]

The conventional back frame is
Because the length of the horizontal part is long, when disassembling and packing, the back frame is bulky, the volume of the packing state is increased, and it is not possible to load many chairs at once and transport them Was a problem.

[0007] In view of the above drawbacks, the present invention can easily be assembled, can reduce the volume of the packaged state, can increase the load on the transportation means, and can mount the back frame on the chair. It is an object of the present invention to provide an attachment method and a structure thereof.

[0008]

According to the present invention, there is provided a method of attaching a substantially L-shaped back frame having a horizontal portion formed at a lower end of a vertical portion to a chair. And a tapered shape that becomes narrower toward the distal end, protruding inward on both sides to form a locking ridge, and one base end is made wider than the distal end of the horizontal portion to form a horizontal portion. And a locking groove is formed by projecting inward on both sides corresponding to the locking ridge of the horizontal portion to form a locking groove.
After the back frame is provided and the tip of the second back frame is fastened or pivoted to the mounting frame of the chair, the locking ridge of the horizontal portion of the back frame is inserted into the locking groove of the second back frame. Fit
Characterized in that the back frame is attached to the second back frame, or in the attachment of the back frame to the second back frame, the engaging holes of both frames are perforated with locking holes,
A locking tool corresponding to both locking holes is locked in both locking holes.

The present invention provides a structure for mounting a substantially L-shaped back frame having a horizontal portion formed at a lower end of a vertical portion to a chair, wherein the length of the horizontal portion of the back frame is reduced. It is formed in a tapered shape that becomes narrower toward the tip, and it is made to project inward on both sides to form a locking ridge,
On the other hand, the base end is wider than the tip of the horizontal part, and it is formed in a tapered shape corresponding to the shape of the horizontal part and becomes narrower toward the tip. A second back frame formed by projecting and forming a locking groove is provided, and after the tip of the second back frame is fixed or pivotally supported on the mounting frame of the chair, the second back frame is locked. In the groove, the locking ridge of the horizontal portion of the back frame is externally fitted, and the back frame is attached to the second back frame, or when the back frame is attached to the second back frame,
A locking hole is formed in a fitting surface of both frames, and a locking tool corresponding to the locking holes is locked in the locking holes.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The chair used in the present invention is a swivel chair and may or may not have a lifting mechanism.

The structure for attaching the back frame to the chair according to the present invention has the following structure, as shown in FIGS.

The length of the horizontal portion 12 of the substantially L-shaped back frame 14 in which the horizontal portion 12 is formed at the lower end of the vertical portion 10 is reduced, and is formed in a tapered shape that becomes narrower toward the tip. Let me do it.

In this embodiment, the vertical portion 10 and the horizontal portion 1
2 are integrally formed of a steel material having a U-shaped cross section, the length of the horizontal portion 12 is about 10 cm, which is about half the length of the horizontal portion of the conventional back frame.

A locking ridge 16 is formed on both sides of the horizontal portion 12 so as to project inward.

In this embodiment, the shape of the locking ridge 16 is substantially semicircular, and the end of the locking ridge 16 on the side of the vertical portion 10 is chamfered.

On the other hand, the base end is wider than the front end of the horizontal portion 12 and is formed in a tapered shape corresponding to the shape of the horizontal portion 12 and becomes narrower toward the front end. The locking groove 18 is protruded inward in correspondence with the ridge 16.
Is provided.

In this embodiment, like the back frame 14, the second back frame 20 is formed of a steel material having a U-shaped cross section. The length of the second back frame 20 is about 10 cm. 18 is substantially semicircular, and the locking groove 1
The tip of 8 is chamfered.

The back frame 1 of the second back frame 20
Auxiliary stoppers 21 are formed at the lower portions on both sides of the fourth side, and the auxiliary stoppers 21 apply a load from the back frame 14 to the second back frame 20 when the seated person leans against the back and tilts the back backward. It is for distributing and transmitting.

The locking holes 2 are formed in the fitting surfaces of the frames 14 and 20.
2 is perforated.

In this embodiment, the locking hole 22 has a rectangular shape.

Locking tools 24 corresponding to both locking holes 22 are provided.

In this embodiment, the locking member 24 has the same rectangular shape at the middle portion as the locking hole 22, and the upper and lower portions are rectangular shapes wider than the middle portion, and are integrally formed of resin. It is.

The mounting frame 26 of the chair used in this embodiment is configured such that a seat plate 30 is tiltably mounted on a main body 28 while being urged toward the main body 28.

In the figure, 32 is a back, 34 is a seat, 36 is a support, 38 is a leg, 40 is a leg composed of a support 36 and a leg 38, and 42 is a back frame cover.

The mounting frame 2 for the chair of the back frame according to the present invention.
The method of attaching the cable 6 to the cable 6 will be described below.

The tip of the second back frame 20 is pivotally supported on the mounting frame 26 of the chair.

At this time, since the mounting frame 26 of this embodiment is of a type in which the back 32 and the seat 34 can tilt, the second back frame 20 is supported by the mounting frame 26.

The locking groove 18 of the second back frame 20
The backing frame 14 is attached to the second backing frame 20 by fitting the locking ridge 16 of the horizontal portion 12 of the backing frame 14 outside and pulling the rearward side of the backing frame 14.

Locking hole 2 in the fitting surface of both frames 14 and 20
The fitting 24 is fitted and locked in 2.

The engagement between the engagement hole 22 and the engagement member 24 makes the engagement between the frames 14 and 20 more firm.

Next, the back 32 is attached to the back frame 14 attached to the attachment frame 26 of the chair, and the seat 34 and the leg 40 are attached to the attachment frame 26, thereby assembling the chair.

The back frame 1 which is seated and has the above structure
When a force (load) for tilting rearward is applied to the back mounted on the back 4, a diagonally rearward downward force (combined force) is applied to the locking portion between the back frame 14 and the second back frame 20. Therefore, the joint between the back frame 14 and the second back frame 20 becomes stronger, and the back frame 14 is
It does not deviate from 0 (see FIG. 5).

As shown in FIG. 8, when the chair of this example is disassembled and packed, the back frame 14 can be separated from the second back frame 20, so that the volume of the packed state is smaller than that of the conventional product. As a result, the space for loading the transportation means can be reduced, and if the same loading space is used, more cargo can be loaded than conventional products, and more transport can be performed at one time.

In this embodiment, the shapes of the locking ridge 16 and the locking groove 18 are substantially semicircular, but are not limited to these shapes.

The back frame 14 and the second back frame 2
Although the locking tool 24 is fitted and locked in the locking hole 22 on the fitting surface with the locking frame 0, the back frame 14 can be removed even if the locking hole and the locking tool are omitted.
And the second back frame 20, the locking ridge 16 and the locking groove 18
It does not come off due to the locking with.

Since the mounting frame 26 of this embodiment is of a type in which the back 32 and the seat 34 can be tilted, the second back frame 2
0 is supported by the mounting frame 26 of the chair.
In a type of mounting in which the 2 does not tilt, the second back frame 20 may be fixed to the mounting frame of the chair.

[0036]

According to the method and structure for mounting the back frame to the chair according to the present invention, the back frame and the second back frame are mounted by fitting the locking ridges and locking grooves of both frames to the outside. Therefore, general consumers can easily assemble without requiring additional fastening means such as screws, pins, bolts and nuts.

When a force (load) for tilting backward is applied to the back mounted on the back frame, an obliquely rearward downward force (combined force) is applied to the locking portion between the back frame and the second back frame. ) Acts, the joint between the back frame and the second back frame becomes stronger, and the back frame does not come off from the second back frame.

Further, since the back frame can be divided from the second back frame, the volume in the packed state is reduced as compared with the conventional product, so that the space for loading the transportation means can be reduced. Thus, more chairs can be carried than conventional products, and more chairs can be transported at one time.

When the back frame is attached to the second back frame, locking holes are formed in the fitting surfaces of both frames, and locking tools corresponding to the locking holes are engaged in the locking holes. By stopping, the engagement between the back frame and the second back frame can be further strengthened.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of a main part showing a mounting structure of a back frame to a chair according to the present invention.

FIG. 2 is a plan view showing a state immediately before engagement between a back frame and a second back frame.

FIG. 3 is a plan view showing a locked state between a back frame and a second back frame.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a front view showing the load of the chair equipped with the back frame according to the present invention.

FIG. 6 is an exploded perspective view of the back frame and the mounting frame of the chair according to the present invention.

FIG. 7 is a front view of a main part showing a tilted state of the back.

FIG. 8 is a perspective view showing a state in which the chair on which the back frame according to the present invention is mounted is disassembled and packed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vertical part 12 Horizontal part 14 Back frame 16 Locking ridge 18 Lock groove 20 Second back frame 22 Lock hole 24 Locking tool

Claims (4)

[Claims] 1. A method of attaching a substantially L-shaped back frame (14) having a horizontal portion (12) formed at a lower end of a vertical portion (10) to a chair, comprising the steps of: In addition to making it shorter and shorter, it is formed in a tapered shape that becomes narrower toward the tip, and it is projected inward on both sides to form a locking ridge (16), while one base end of the horizontal part (12) is Wider than the tip, horizontal part (12)
In accordance with the shape of the locking groove (18), it is formed in a tapered shape that becomes narrower toward the tip, and protrudes inward on both sides corresponding to the locking ridge (16) of the horizontal part (12). ) Is formed, and after the tip of the second back frame (20) is fastened or pivoted to the mounting frame (26) of the chair, the second back frame (20) is formed. ) Locking groove (18)
The locking ridge (16) of the horizontal portion (12) of the back frame (14) is fitted to the outside, and the back frame (14) is attached to the second back frame (20). How to attach the back frame. 2. When the back frame (14) is attached to the second back frame (20), a locking hole (22) is formed in a fitting surface of the two frames (14) and (20). 2. The back frame for a chair according to claim 1, wherein the locking tools (24) corresponding to the locking holes (22) are locked in the holes (22). Mounting method. 3. A structure in which a substantially L-shaped back frame (14) having a horizontal portion (12) formed at the lower end of a vertical portion (10) is attached to a chair, wherein the horizontal portion (12) of the back frame (14) is provided. ) Is made shorter and shorter, and is formed in a tapered shape that becomes narrower toward the distal end, and protrudes inward on both sides to form a locking ridge (16). Wider than the tip of 12), horizontal section (12)
In accordance with the shape of the locking groove (18), it is formed in a tapered shape that becomes narrower toward the tip, and protrudes inward on both sides corresponding to the locking ridge (16) of the horizontal part (12). A second back frame (20) formed by forming the second back frame (20) is fixed to the chair mounting frame (26) or supported by the second back frame (26). Lock groove (18) of frame (20)
The locking ridge (16) of the horizontal portion (12) of the back frame (14) is fitted to the outside, and the back frame (14) is attached to the second back frame (12). Mounting structure for the back frame. 4. When the back frame (14) is attached to the second back frame (20), a locking hole (22) is formed in a fitting surface of the two frames (14) and (20). 4. The back frame for a chair according to claim 3, wherein the locking tools (24) corresponding to the locking holes (22) are locked in the holes (22). Mounting structure.