JP2003088442A - Chair with frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance efficiency in frame material working and an assembling work concerning a chair where a plurality of frame materials are connected to constitute leg frames. SOLUTION: Forelegs 4 and rear legs 5 crossing in a chevron shape are respectively connected by joints 6. Each joint 6 consists of a tubular part 6a to which the rear leg 5 is fitted from an inside and a boss part 6b to which the foreleg 4 is fitted from an outside. The forelegs 4 are horizontally deviated inward compared with the rear legs 5 in the front view of the chair. Thus the chair is horizontally stacked in a front and rear direction. Efficiency in a connection work is further improved in this structure than that of connection by welding. Besides, the upper end of the foreleg 4 is used in a flat state as it is so that time and labor are saved in machining the forelegs 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair having a frame structure.

[0002]

2. Description of the Related Art A chair having legs as a frame structure is generally called a pipe chair because its material is a metal pipe (a steel pipe or an aluminum pipe), and it is often used as a folding chair or a stacking chair. ing.

In this pipe chair, for example, the left and right legs are made up of a plurality of foot members extending in directions intersecting each other, and conventionally, the foot members intersecting each other are connected by welding. .

[0004]

However, in the conventional method of welding and connecting the foot members to each other, since the load is applied to the welding portion, the welding is carefully performed so that sufficient welding strength can be secured. Therefore, there is a problem that not only a great deal of time and labor is required for the welding process, but also the quality varies greatly.

Further, in order to make the chair stackable, one foot member is shifted to the left or right direction with respect to the other foot member. Therefore, only the upper end portion of the foot member should be curved with a small curvature. However, there is also a problem that it takes a lot of time and labor to curve only the upper end portion.

That is, when the metal pipe is bent into a dogleg shape at its central portion, for example, it can be easily done because the bending margins are provided on both sides of the bending portion, but when only the end portion of the metal pipe is bent, Bending was difficult because there was no bending allowance on one side of the bend.

The present invention aims to improve the present situation.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a chair having legs formed by a frame composed of a plurality of frame members (or frame portions) extending in directions intersecting with each other. In, the intersecting frame members are connected by a joint into which the ends of the frame members are fitted.

According to the invention of claim 2, in claim 1,
The left and right legs are composed of the front and rear legs that intersect each other in a letter-shape when viewed from the side, and the rear legs are displaced to the left and right outside of the front legs when viewed from the front, while the seats are flipped up so that multiple chairs Horizontal stacking is possible with the legs fitted in the front and back. Then, the front leg and the rear leg are connected by the joint.

According to the invention of claim 3, in claim 2,
The joint includes a tubular portion into which the rear foot fits from the inside, and a boss portion into which the front foot fits from the outside, and the tubular portion has a shape displaced to the left and right outside from the boss portion in a front view. ing.

[0011]

According to the present invention, since the frame members extending in the intersecting direction are connected by the joint, the efficiency of the connecting work can be significantly improved as compared with the conventional connecting work by welding, and the quality can be improved. Can also be made uniform.

Further, instead of the conventional technique in which the ends of the frame material are bent and then welded, for example, as described in claim 3, the connecting portions of the joints are displaced from each other so that the frame material itself is Since it is not necessary to perform a special bending process, it is possible to greatly reduce the time and labor required for processing the frame material. Therefore, it is particularly useful in stacking chairs.

Since the joint can be manufactured by a die casting method, a casting method, or a molding method using a mold such as resin molding, the processing is simple.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings (FIGS. 1 to 12).

.. Overview First, an overview will be described with reference to FIGS. Figure 1
2A is a right side view of the chair, FIG. 2 is a front view, FIG. 3 is a front view in a folded state (state in which the seat is flipped up), and FIG. 4 is a side view in a stacked state. The chair includes left and right legs 1 made of metal pipe (may be made of a round bar), a seat (or a seat portion) 2, and a backrest 3.

The left and right legs 1 have a front leg 4 and a rear leg 5 which intersect in an "in" shape, and they are connected by a joint 6. Casters 7 are attached to the lower ends of both feet 4, 5. Further, the left and right front feet 4 are connected by a lateral rod 8 at an upper portion thereof. The lateral rod 8 is welded to the front foot 4.

The seat 2 includes a receiving frame 9 formed of a metal pipe in a rectangular shape, and a synthetic resin seat plate 1 fixed to the receiving frame 9.
0, and the rear portion of the receiving frame 9 is connected to the bearing 11 provided on the upper end portion of the front foot 4 by the pin 12. Therefore, as shown by the one-dot chain line in FIG. 1 and also shown in FIG. 3, the seat 2 can be flipped up and rotated about the pin 12 (that is, can be folded).

The seat plate 10 is formed with a downwardly projecting ridge 10a surrounding the receiving frame 9, and a recess 13 for preventing interference with the bearing 11 is formed at the rear part of the ridge 10a. There is. A recess 13 is also formed in the front part of the ridge 10a (the significance thereof will be described later).

A support rod 14 which is bent upward in a concave shape in a front view is fixed to the receiving frame 9 by welding. The support rod 14 is connected to the horizontal rod 8 via a receiving member 15 made of synthetic resin.
It is supposed to be supported by.

The backrest 3 is made of synthetic resin, and a tubular portion 3a having a downward opening is formed at the lower ends of both left and right sides, and the tubular portion 3a is fitted on the upper part of the rear foot 5. The tubular portion 3a is fixed to the rear leg 5 with a screw (not shown). The backrest 3 is provided with a plurality of rows of slit groups 16. A cushion may be attached to the backrest 3, but in that case, it is also possible to attach the cushion using the slit group 16.

The front foot 4 extends substantially vertically when viewed from the front. On the other hand, the hind legs 5 are located slightly outside the hind legs 5 in a front view, and are inclined at a gentle angle so that the hind legs 5 spread outward as they go downward, and the left and right hind legs 5 are in a V shape in a front view. Has become.

Since the rear foot 5 is located outside the front foot 4 (or the front foot 4 is located inside the rear foot 5) in the front view of the chair, as shown in FIG. The chairs can be stacked (stacked) with the legs 1 and 1 fitted in the front-rear direction.

The lower ends of the front and rear feet 4, 5 may be integrally connected by a horizontal portion (in this case, the front and rear feet 4, 5).
Is formed by a single pipe, so it will be connected by the joint 6 by elastically deforming).

[0024]. Details of the fitting 6 are shown in FIGS. 5 and 6.
FIG. 5 is a partially cutaway side view of a main part, FIG. 6A is a front view of the joint 6 for the right leg, and FIG.

The joint 6 is a tubular portion 6 into which the rear foot 5 is fitted from the inside.
a and a boss portion 6b into which the front foot 4 is fitted from the outside, and the boss portion 6b is located inside the tubular portion 6a in a front view. Therefore, it is not necessary to bend the upper end portion of the front foot 4 and the straight leg may be left straight. Therefore, the processing of the front foot 4 is very simple.

The joint 6 can be made by die casting or casting of a light alloy such as aluminum, or can be a molded product of synthetic resin, and its material is not limited.

Although it is necessary to fix the front and rear feet 4, 5 and the joint 6, if the front and rear feet 4, 5 and the joint 6 are made of the same metal, they may be fixed by welding. It is also possible to employ fixing by screws or tight fitting by forced fitting.

When the joint 6 is fixed to the hind legs 5 by welding, this welding is for preventing slip-off and does not apply a load to the welded portion, so to speak, spot-like simple welding is sufficient. There is no need to spend time on welding work.

It is possible to form the portion of the joint 6 into which the front foot 4 is fitted, but if this is done, a step may be formed between the front foot 4 and the front end of the joint 6, which may impair the appearance. On the other hand, when the front foot 4 is fitted into the boss portion 6b from the outside, the outer surfaces of the front foot 4 and the joint 6 can be aligned, and the appearance is clean and good.

In this embodiment, the joint 6 is used to connect the front and rear feet 4 and 5, but a joint may be used to connect the front foot 4 and the lateral rod 8. Further, the joint 6 may have a structure in which three frame members are connected. Furthermore, although the joint in the illustrated form is a kind of T joint, it is also possible to adopt a structure in which two frame members are connected in an L shape.

In order to allow the chairs to be stacked horizontally, the rear legs 5 have a vertical posture when viewed from the front, the front legs 4 spread out in a V shape when viewed from the front, and the front legs 4 when viewed from the front of the chair. It is also possible to shift the outer side of the rear foot 5, but in that case, the boss portion 6b of the joint 6 may be moved to the outer side of the tubular portion 6b in the front view.

.. Seat Next, the structure of the seat will be described with reference to FIGS. 7 is a sectional view taken along the line VII-VII in FIG. 1, and FIG. 8 is a line VIII-VIII in FIG.
It is a cross-sectional view, and as shown in these drawings, an intermediate plate 18 and a cushion material 19 are laminated on the upper surface of the seat plate 10.

The intermediate plate 18 is made of, for example, a synthetic resin and has appropriate hardness and elasticity, and is bonded to the cushion material 19 with an adhesive. Further, the intermediate plate 18 and the seat plate 10 are fixed by, for example, screws (adhesion with an adhesive, or snap engagement with engagement claws and engagement holes (or engagement claws) is also possible. ).

A cloth (skin material) 20 such as a cloth is adhered to the surface of the cushion material 19 with an adhesive. The peripheral edge of the cloth 20 is in a state of embracing the intermediate plate 18, and the cloth 20 and the intermediate plate 18 are also bonded (the intermediate plate 18 may be overlapped with the edge of the cloth 20 from below,
According to the embodiment, the appearance is good because the edge of the intermediate plate 18 cannot be seen).

In FIG. 9, (A) is a partially cutaway plan view of the seat 2, and (B) is a plan view of the intermediate plate 18. As shown in this figure, a large number of slit groups 21 are formed on the seat plate 10 in order to facilitate the flexural deformation and improve the sitting comfort. The slit group 21 is provided in a concentrated manner where a person's body pressure is strongly applied.

Although the slit group 21 is omitted from the seat plate 10 in FIG. 3, when the seat 2 is flipped up, the seat plate 10 is actually removed.
The slit group 21 is visible.

In the portion of the intermediate plate 18 where the body pressure of the seated person is strongly applied, a hollow hole 22 is provided as an example of the deformation facilitating means. The reason why the deformation facilitating means such as the hollow hole is provided is to prevent the bending deformation function of the seat plate 10 from being impaired by the provision of the intermediate plate 18.

By the way, when the cushion member 19 is adhered to the seat plate 10 with an adhesive, as shown in FIG.
The adhesive 23 is applied to the upper surface of the
However, if the slit group 21 is formed on the seat plate 10, the adhesive 23 will be applied to the slit group 21.
It hangs down and is exposed to the outside. Therefore, FIG.
When the seat plate 10 is flipped up as described above, the adhesive agent 23 dripping from the slit group 21 and hardened is exposed, which spoils the appearance.

Therefore, by using the intermediate plate 18, the intermediate plate 1
8 is adhered to the cushion material 19, and then the intermediate plate 18 is fixed to the seat plate 10. The process is as shown in FIGS.

That is, first, as shown in FIG. 10, the intermediate plate 18 is adhered to the cushion material 19 by applying the adhesive 23 on the upper surface of the intermediate plate 18 and then stacking this on the cushion material 19. At the same time or after this, the cloth 20 and the cushion material 19 are bonded and the cloth 20 and the intermediate plate 18 are bonded.

Then, the intermediate plate 18 and the seat plate 10 are fixed by means such as screwing. As a result, even if the intermediate plate 18
Even if the adhesive 23 is hardened with the adhesive 23 hanging down,
Since the adhesive 23 is not exposed to the outside of the seat plate 10, even if the seat 2 is flipped up, it does not spoil the appearance.

The deformation facilitating means provided on the intermediate plate 18 so as not to impair the flexural deformation of the seat plate 10 is not limited to the formation of the hollowed hole 22, and the portion on which the body pressure of the seated person strongly acts is very thin. Or (in this case, there is an advantage that the bonding strength between the cushion material 19 and the intermediate plate 18 is high),
A large number of slits, punched holes, or a large number of cuts may be formed in the intermediate plate 18.

It should be noted that the use of the intermediate plate 18 can be an independent invention regardless of the use of the joint 6.

.. Relationship between seat and receiving frame By the way, since the horizontal rod 8 of the receiving frame 9 is bent upward, the seat plate 10 is allowed to flex and deform so as to sink downward, and the slit group 21 is formed in the seat plate 10. The significance of what has been done is revealed effectively (the seat plate 10 need only be flexibly deformed, and the slit group 21 is not necessarily formed).

In this case, although it is possible to support the receiving frame 9 with the front legs 4 without providing the support rod 14, the support rod 14
The provision of is advantageous in that the receiving frame 9 can be reinforced and the strength can be improved. In addition, a horizontal rod 8 is essential for connecting the left and right legs 1.
Since the support rod 14 is supported by, the structure of the chair can be simplified accordingly.

Further, in the past, when moving the seat in a state of being flipped up, the edges of the backrest and the edges of the seat were moved by hand, but it is difficult to grasp the edges of the backrest and the edges of the seat. In contrast to this, in the configuration of the present embodiment, as shown in FIG. 3, when the seat 2 is flipped up, the support rod 14 projects forward, so that the support rod 14 is replaced with a handle (handle). It also has the advantage that it can be grabbed by hand and the chair can be easily moved.

Further, when the horizontal rod 8 is provided with the receiving member 15 having an upward concave shape in a side view, the supporting rod 14 is fitted to the receiving member 15 and the supporting rod 14 is held so as not to be displaced, so that a person is seated. The seat 2 is maintained in a state without rattling, which has the advantage of improving the durability of the chair.

Such a seat plate receiving structure may also be an invention independent of itself regardless of the joint 6 and the intermediate plate 18.

.. Related Invention (FIGS. 13 to 15) FIGS. 13 to 15 show a chair according to the invention related to the invention of the present application. 13 is a front view, and FIG. 14 (A)
Is a side view, (B) is a sectional view taken along line BB of (A), and FIG. 15 is a side view in a stacked state.

In the present invention, the leg 1 of the chair is formed in a substantially upwardly open U-shape when viewed from the side, and the front upper ends of the left and right legs 1 are integrally connected by the front horizontal rod 25. That is, 1
The left and right legs 1 are formed by bending a book pipe (or rod). And at the rear of the left and right legs 1,
The rear cross rod 26 supporting the seat 2 is connected by welding. A pair of front and rear grounding bodies 27 are attached to the left and right legs 1.

The rear parts of the left and right legs 1 are gently inclined so as to form a substantially C-shape when viewed from the front. Therefore, as shown in FIG. 15, a large number of chairs are placed in the upper chair in front of the lower chair. Can be stacked in a staggered state.

In this example, the seat plate 10 and the backrest 3 are the same as those used in the embodiment of the present invention (the cross sections have the same structure). Further, in this example, the recess 13 formed in the front portion of the seat plate 10 has the front side rod 2
Fits in 5. Therefore, the same type of seat plate 10 can be used for both the embodiment of the present invention and the examples of FIGS. 13 to 15, and the cost can be suppressed.

The front parts of the left and right legs are provided with front stoppers (spacers) 28 on which the front grounding bodies 27 of the upper chairs are placed when a plurality of chairs are stacked. On the other hand, the rear side rod 2
The left and right ends of 6 are inclined rearward in a side view, and a rear stopper 29 that is placed on the inclined portion 26a of the upper chair when the chairs are stacked is fixed to the lower surface of the inclined portion 26a.

When the rear stopper 29 is provided on the inclined portion 26a of the rear horizontal rod 26, the upper chairs are displaced rearward by the guide action of the inclined portion 26a, so that the stacked chairs are not displaced forward and backward. There is an advantage that can be prevented. It is also possible to form the rear stopper 29 in a downwardly concave cross section in front view to prevent the stacked chairs from shifting in the left-right direction.

The inclined portion 26a may be directly overlapped (provided that the rear stopper 29 is provided, which has an advantage of uniform contact). Further, the inclined portion 26a is not limited to being provided on the rear lateral rod 26, but may be formed on the upper portion of the leg extending in the front-rear direction, or may be specially provided as a dedicated member for stacking.

Further, in order to prevent the stacked chairs from shifting back and forth, it is possible to provide another shift preventing means.

In the examples of FIGS. 13 to 15, the seat plate is supported by the front and rear horizontal rods 25 and 26, and a bending allowance space is formed below, so that the seat plate is supported by the receiving frame 9 in the embodiment of the present invention. You can get the same effect as.

.. Installation of Elbow Pad (FIG. 16) In FIG. 16, in the chair of the embodiment of the present application and the chair of the related invention, the elbow pad 31 is used by using the tubular portion 3 a of the backrest 3.
The state where is attached is shown.

That is, in this example, the tubular portion 3a of the backrest 3 is opened vertically, while the elbow pad 31 has the rear foot 5
The elbow rest 31 is attached to the backrest 3 by integrally providing the rod 32 that fits in from above. Elbow pad 3
When 1 is not used, the upward hole of the cylindrical portion 3a is closed by the cap 33.

It is possible to fit the rod 32 of the elbow rest 31 into the tubular portion 3a itself, but since the backrest 3 is made of synthetic resin and may be cracked, if it is inserted into the rear leg 5 as in this example. There is an advantage that the supporting strength can be secured.

[Brief description of drawings]

FIG. 1A is a right side view of a chair, and FIG. 1B is a side view of a seat plate.

FIG. 2 is a front view of a chair.

FIG. 3 is a front view showing a state where a seat is flipped up.

FIG. 4 is a side view in a state where the stacking is performed in the horizontal direction.

FIG. 5 is a partially cutaway side view of a main part.

FIG. 6A is a front view of the joint for the right leg, and FIG. 6B is a partially cutaway right side view.

7 is a sectional view taken along line VII-VII of FIG.

8 is a sectional view taken along line VIII-VIII of FIG. 7.

9A is a partially cutaway plan view of a seat, and FIG. 9B is a plan view of an intermediate plate.

FIG. 10 is a diagram showing a step of attaching a seat.

FIG. 11 is a sectional view of a main part of a seat.

FIG. 12 is a cross-sectional view showing a comparative example.

FIG. 13 is a front view showing an embodiment of another invention.

14A is a side view of another invention, and FIG. 14B is a sectional view taken along line BB of FIG. 14A.

FIG. 15 is a side view showing a state in which chairs according to another invention are stacked.

FIG. 16 is a diagram showing another usage example.

[Explanation of symbols]

1 leg Two seats 4 forefoot 5 hind legs 6 joints 6a tube 6b Boss 8 Yokomo 9 receiving frame 10 seat plate 11 bearings 14 Support rod 18 Intermediate plate 19 Cushion material 20 cross 21 slit group

Claims (3)

[Claims] 1. A chair in which legs are constituted by a frame composed of a plurality of frame members extending in a direction intersecting with each other, wherein the intersecting frame members are jointed by end portions of the frame members. A frame-structured chair that is connected. 2. The left and right legs are composed of a front leg and a rear leg that intersect in a letter-like shape in a side view, and the rear leg is displaced to the left and right outside of the front leg in a front view, while the seat is flipped up. According to the invention, the plurality of chairs can be horizontally stacked with the legs fitted in the front and rear, and the front legs and the rear legs are connected by the joint, and the folding type horizontal stacking is possible. Chair. 3. The joint includes a tubular portion into which the rear foot fits from the inside, and a boss portion into which the front foot fits from the outside, and the tubular portion is located to the left and right outside of the boss portion in front view. The chair according to claim 2, wherein the chair has an offset shape.