JP3284038B2 - Chair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for preventing a chair from tipping over, for example, a technique effective for a chair used in a banquet hall or a conference room.

[0002]

2. Description of the Related Art As a chair used in a banquet hall, a conference room, or the like, there is a four-legged chair in which rear legs are inclined to be widened. The lower end, which is the leg end of the back leg of this type of conventional chair, is covered with a resin leg end member, and the leg end surface of the leg end member is viewed from the side to prevent damage to the floor surface due to the edge. It is formed in an arc-shaped kamaboko shape.

[0003]

However, in a chair in which a leg end surface portion of a rear leg is covered with a leg-shaped leg end member at the lower end of the rear leg, the occupant stands up in a posture without pulling the chair backward. Then, the front end of the seat plate of the chair is caught on the calf of the occupant, and the chair falls backward centering on the circumferential surface of the rear end of the Kamaboko-shaped leg end member. Therefore, in order to avoid this fall, the occupant is forced to stand up while pushing down the chair with his / her hand in the middle hip position.

[0004] However, in a banquet hall or a conference room where a thick carpet or carpet is spread, the circumferential surface of the leg end member put on the rear leg does not slip because the circumferential surface of the leg end member cuts into the carpet or carpet. There is a problem that the chair may fall backwards around the leg end member of the back leg that bites into a carpet or a carpet with long hairs because the chair cannot be pushed down by hand in the state of This has been made clear by the present inventors. Investigations to verify this issue have shown that if you get up from this kind of chair in a banquet hall with thick carpets or long-haired carpets, you will need an attendant to get up, It was the fact that she was standing up while lifting her, or stood up once off the side of the chair.

[0005] It is an object of the present invention to provide a chair which can easily stand up while preventing a fall in any situation.

[0006]

Chair according to the present invention SUMMARY OF THE INVENTION, in the chair back leg is inclined flared, the hind legs (4) of the leg edge portion (15) in the side view is substantially perpendicular triangular
A sled-shaped part (17) having a sled shape is formed.
The slanted surface (18) of the right-angled triangle of the sled-shaped part (17)
When the contact portion (19) at the front end is in contact with the ground, the contact portion is formed on an inclined surface which is gradually separated from the contact surface as it goes rearward, and the rear end of the inclined surface (18) has a convex curve.
A curved portion (20) is formed .

According to the above-described means, when the chair is depressed rearward when the occupant stands, the upwardly inclined surface, which is the end surface of the leg, functions as the tip of the sled.
The splaying back legs slide smoothly even on thick carpets or long carpets, preventing the chair from tipping backwards. Even if the chair leans backward when the occupant gets up, the inclined surface of the leg end surface is horizontal and it is in a state that it is slippery because it comes into full contact with the ground contact surface and at the maximum area. Can be prevented by the rear leg sliding backwards. Also, if the chair leans backwards on a thick carpet or a carpet with long hairs, the part that has risen from the contact surface of the inclined surface of the rear leg will come out of the depression Since the entire area where there is no ground is in a slippery state, the fall of the chair can be prevented by the rear legs sliding smoothly backward.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a chair according to an embodiment of the present invention, wherein (a) is a side view, (b) is an enlarged sectional view of part (b) of (a), and (c) is a sectional view. It is a perspective view of the leg end member for back legs. 2 (a) is a side view, and FIG. 2 (b) is an enlarged view of a portion b of FIG.

In the present embodiment, the chair according to the present invention is configured as a chair suitable for use in a place such as a banquet hall or the like where a thick carpet or a carpet with long hair is laid. (Only the left side is shown. The same applies to other components.), And a pair of leg frames 1 and 1 are provided. The leg frame 1 is formed by bending an aluminum square pipe into an arch shape so as to form a seat mounting portion 2, a front leg 3, and a rear leg 4, and a pair of leg frames 1, 1 are arranged symmetrically. . The front leg 3 of the leg frame 1 is bent so as to be slightly wider than the horizontal seat mounting portion 2. That is, the front leg 3 is set to be substantially vertical with a small degree of divergence so as not to interfere with the calf of the occupant in a natural state where the chair is placed on a horizontal floor. In contrast to the front leg 3, the rear leg 4 is a horizontal seat mounting portion 2.
It is bent so as to be relatively large.
That is, even if the rear leg 4 is configured to have a relatively large end spread, the rear leg 4 does not interfere with the calf or the like of the seated person. The so-called chair sitting (stability) is improved by increasing the area. A reinforcing rib 5 is provided between the front leg 3 and the rear leg 4.

A back cap frame 6 is fixedly mounted on each seat mounting portion 2 between the left and right leg frames 1, 1. The back cap frame 6 is formed from a cast product using an aluminum alloy, and a seat 7 is mounted on a horizontal portion thereof, and a back 8 is mounted on a vertical portion thereof.

At the lower end of the front leg 3, a leg end member 9 for a front leg, which actually constitutes a leg end surface, is attached. The front leg leg end member 9 is made of a resin such as polyethylene and is integrally formed into a substantially prismatic shape having a mounting portion 10 and a leg end surface portion 11. The mounting portion 10 of the front leg leg end member 9 is formed in a substantially square prism shape having a cross section that fits into the hollow portion of the square pipe of the front leg 3.
The front leg leg end member 9 is fixedly attached to the lower end of the front leg 3 by being fitted into the hollow portion at the lower end of the front leg. On the other hand, the upper half of the leg end surface portion 11 is formed in a substantially square prism shape having a cross section slightly larger than that of the mounting portion 10, and the lower half of the leg end surface portion 11 is formed in a semi-circular shape in a side view. Have been. Then, the lower end of the mounting portion 10 and the leg end surface portion 11
A step is formed on the outer periphery of the boundary between the front leg 3 and the step. The step forms an engaging portion 12 that engages with the lower end surface of the front leg 3 from below. When the front leg leg end member 9 is attached to the lower end of the front leg 3, the lower end circumferential surface of the kamaboko shape in the leg end surface portion 11 is in contact with the ground contact surface.

The lower end of the rear leg 4 is covered with a leg end member 13 for the rear leg which actually constitutes the leg end. The rear leg leg end member 13 is made of a resin such as polyethylene.
It is integrally formed into a substantially prismatic shape having a mounting portion 14 and a leg end surface portion 15. Attachment part 14 of leg end member 13 for rear leg
Is formed in a substantially square prism shape whose cross section fits into the hollow portion of the square pipe of the rear leg 4, and the mounting portion 14 is fitted into the hollow portion at the lower end of the rear leg 4,
The rear leg leg end member 13 is fixedly attached to the lower end of the rear leg 4. On the other hand, the upper half of the leg end face portion 15 is formed in a substantially square prism shape having a cross section slightly larger than the mounting portion 14, and the lower half of the leg end face portion 15 is formed in a sled shape of a substantially right triangle in side view. Have been. A step is formed on the outer periphery of the boundary between the lower end of the mounting portion 14 and the leg end surface portion 15, and the step forms an engaging portion 16 that engages with the lower end surface of the rear leg 4 from below. Have been.

In the sled-shaped portion 17 formed in the lower half of the leg end surface portion 15, only the ground contact portion 19 at the front end of the inclined surface 18 is grounded in a normal installation state. When the grounding portion 19 of the sled-shaped portion 17 is in contact with the ground, the inclined surface 18 is formed so as to be gradually separated from the grounding surface as going backward, and the rear end of the inclined surface 18 has a convex curved portion 20. Are formed. Also, inclined surface 1
Numeral 8 has a very large curvature in a side view, but is formed on a convexly curved surface as a whole. Although the included angle θ of the inclined surface 18 with the ground contact surface varies depending on the inclination angle and the size of the chair set on the rear leg 4 and the backward inclination angle of the chair accompanying the cuff of the calf on the seat 7, It has been determined by the present inventors that about 9 to 13 degrees is suitable.

In other words, when the chair of this type stands up, the backward inclination is caused by the seated person's calf getting stuck on the front end of the seat, and then the inclination angle depends on the length of the seated person's feet. It was determined. The range of the lift amount of the front end of the seat due to the catch corresponding to the difference range of the length of the foot is 8 to 10 cm, and the inclination angle of the inclined surface 18 of the rear leg end member 13 is about 9 to 13 degrees. Then, it has been found that the contact area of the inclined surface 18 increases most when the chair is tilted backward while the front end of the seat is raised. That is, the inclination angle of the inclined surface 18 is set so that the contact area of the leg end surface is maximized when the chair is inclined backward. Incidentally, in the present embodiment, when the included angle between the flared rear leg 4 and the contact surface is 58 degrees, the included angle θ between the inclined surface 18 and the contact surface is set to about 10 degrees.

Next, the operation will be described. When the chair according to the above configuration is placed on the ground plane 21 on which a thick carpet or a long carpet of a banquet hall or a conference room is laid, and a person (not shown) sits on the seat 7, the ground plane 21 In this state, the depressions 22 are formed by the front leg end members 9 and the rear leg end members 13, respectively. At this time, the leg end member 13 for the rear leg
A sled-shaped portion 17 having an inclined surface 18 rising rearward is formed, and only the ground contact portion 19, which is the front end of the sled-shaped portion 17, is in contact with the ground, and the rear portion of the inclined surface 18 of the sled-shaped portion 17 is recessed. It will be in the state located above 22.

In this state, if the chair is depressed backward when the occupant stands up, the rear leg 4 is formed so as to be widened, so that the rear leg 4 strokes against the grounding surface 21. easy. By the way, in the case of the conventional example in which the leg end surface of the leg end member for the rear leg is formed in a semi-cylindrical shape, the leg end surface of the rear leg 4 is easily engaged with the depression 22 of the ground contact surface 21, and the rear leg 4 slides. Therefore, the occupant trying to get up cannot push down the chair with his hand in the middle waist state, and the chair falls down around the lower end of the rear leg 4.

However, in the present embodiment, the rear part of the inclined surface 18 of the sled-shaped portion 17 formed in the lower half of the rear leg end member 13 is located above the depression 22. When the chair is depressed backward when the occupant stands up, the inclined surface 18 and the convex curved portion 20
Performs the function of the leading end of the sled, so that even the rear leg 4 formed to be flared smoothly slides without engaging with the recess 22. In other words, the occupant trying to stand up can easily push down the chair with his hand in the middle waist state, so that when the occupant stands up, it is possible to prevent the chair from falling backward. Will be.

Even if the squat of the occupant is caught at the front end of the seat 7 of the chair when the occupant stands up, and the chair is tilted backward, the rear legs 4 associated with the tilt of the chair backward.
Of the rear end leg member 13 of the rear leg 13
Since the inclined surface 18 in FIG. 7 is horizontal and contacts the ground contact surface 21 as a whole and in contact with the maximum area, it becomes slippery and slides backward, thereby preventing the chair from falling down.

[0019] In addition, the rotation of the back leg 4 accompanying the inclination of the back of the chair causes the inclined surface 18 of the sled-shaped portion 17 facing the position behind the depression 22 on the ground surface 21 such as a carpet or a carpet to be behind the depression 22. When the vehicle is on the ground contact surface 21 at the position, the function of the tip of the sled is exerted, so that the rear leg leg end member 13 smoothly slides rearward. As a result, the chair can be prevented from falling over by the rear leg 4 smoothly sliding backward.

As described above, in the present embodiment, the sled-shaped portion 17 is formed on the rear leg leg end member 13 attached to the lower end of the rear leg 4 formed to be divergent. Since the leg end member 13 for the leg can slide smoothly on the grounding surface 21, even when the chair is installed on the grounding surface 21 such as a thick carpet or a carpet with a long bristle, when the occupant stands up. The chair can be prevented from falling. Further, it is possible to prevent the chair from tipping over due to the chair leaning backward due to the calf getting caught on the front end of the seat when the occupant tries to stand up, regardless of the height of the occupant. Therefore, even if a chair is installed in a banquet hall or a meeting room with a thick carpet or a carpet with long hairs, the attendant when standing up from the chair is omitted regardless of the height difference of the occupants. Can also
Actions such as standing up while lifting the entire chair or standing up to the side of the chair can be abolished regardless of the height difference of the occupants. That is, the performance and value of this kind of chair can be enhanced.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the embodiment, and various modifications can be made without departing from the gist of the invention. Needless to say.

For example, the sled-shaped portion is not limited to being formed on the rear leg end member, but may be formed directly on the lower end of the rear leg. In short, the leg end surface of the rear leg may be formed on an inclined surface that is gradually separated from the ground contact surface as it goes rearward in the ground contact state so that the maximum area is obtained when the chair is inclined backward.

The front leg and the rear leg are not limited to being formed integrally by the leg frame, but may be formed separately. The specific structure of the front leg, the rear leg, the seat, and the back is not limited to the structure of the above-described embodiment, and can be appropriately designed as desired.

[0024]

As described above, according to the present invention,
In any situation, it is possible to prevent the chair having the rear legs that are inclined to the flared side from falling when rising.

[Brief description of the drawings]

FIG. 1 shows a chair according to an embodiment of the present invention;
(A) is a side view, (b) is an enlarged sectional view of a part b of (a),
(C) is a perspective view of a leg end member for rear legs.

FIGS. 2A and 2B show the operation, wherein FIG.
(B) is an enlarged view of the b part of (a).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Leg frame, 2 ... Seat mounting part, 3 ... Front leg, 4 ... Back leg, 5 ... Reinforcement rib, 6 ... Back cap frame, 7 ... Seat, 8 ...
Back, 9 front leg leg end member, 10 mounting portion, 11 leg end surface portion, 12 engaging portion, 13 rear leg leg end member, 14 mounting portion, 15 leg end surface portion, 16 engagement Joint portion, 17: sled shape portion, 18: inclined surface, 19: ground contact portion, 20: convex curved portion,
21: contact surface, 22: depression, θ: included angle between inclined surface and contact surface.

Claims (1)

(57) [Claims] 1. A chair back leg is inclined flared side view the foot edge portions (15) of the rear legs (4) is Ryakujika
A sled-shaped part (17) of a triangular sled shape is formed.
And the slanted surface of the right triangle of the sled-shaped portion (17).
(18) is in the state where the grounding part (19) at the front end is grounded
Toward the Oite rear is formed on the inclined surface that gradually separates from the ground surface, a rear end portion of the inclined surface (18)
A chair having a convex curved portion (20) formed thereon.