JP3531120B2 - 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 chair frame structure, and more particularly to a chair in which a frame member is composed of only solid rods.

[0002]

2. Description of the Related Art Although the structure of a chair varies depending on its use and price, it is desirable that any chair has excellent sitting comfort, design and durability. Various frame structures have been conventionally used to meet the above requirements. The chair frame is made of various materials such as wood, synthetic resin, and metal, and there are some chairs that do not have a frame but have a seat and a foot formed integrally. However, a metal frame is most suitable for mass production, is robust, and has a basic structure that is the same, so that the product development can be abundant by exchanging the seat and backrest. In many cases, conventionally used methods include bending and combining metal pipes appropriately, and attaching a seat surface and a backrest to the skeleton of a chair to which metal plates are fixed. As a conventional example, a frame structure of a chair is disclosed in Japanese Utility Model Publication No. 58-93261 and Japanese Utility Model Publication No. 1-131346.

[0003]

In the method of using the pipe as a frame, the role of the frame is to support a load, and in order to absorb a shock applied when sitting, a spring or a spring is provided in the frame structure. This was done by incorporating a damper device or using a cushion material attached to the seat. Since the pipe itself is made of thin wall, it is fragile, and if the load concentrates at one place, it may break at that part. Therefore, increase the cross-sectional area of the pipe or make the cross-sectional shape highly rigid to prevent deformation. It was necessary to hold back. Therefore, it is difficult to positively elastically deform the pipe itself to provide a structure that softens the impact. Further, when the pipe is bent, it is necessary to deform it so that the cross-sectional shape does not change significantly, which requires a lot of trouble. In addition, the inner tube portion of the pipe may be subjected to rust prevention treatment, which increases the number of steps.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to use only solid shafts of the same diameter and the same material as a frame member of a chair. The purpose of the present invention is to provide a highly durable chair that does not need to have a separate shock absorbing structure because the frame itself has flexibility.

[0005]

Means for Solving the Problems The present invention for achieving the above object, without the skeleton by combining frame members forming an elastically deformable metal material, same diameter the frame member, in the same material A chair that is formed of a solid rod and has a recess for positioning at the joint of each frame member when the frame members are assembled and the joint is fixed by a welding process , and is curved in a U shape.
Place both ends of the frame member on the front
From the both ends of the base frame to the rear.
The first steep slope is raised, and the first steep slope is connected to the first steep slope.
A curved part is provided to form a gentle slope, and the gentle slope is extended rearward.
By providing a second bend, forming a second steep slope
Extend to the rear to form a side frame,
Install the first reinforcing frame between the second bends of the ram
Then, install a second reinforcing frame between the second steep slopes,
Connect both ends of the U-shaped front support frame to
Installed on both ends of the base frame,
Between the middle part and the side frame and the front support frame
A third reinforcing frame is installed between them.
It

The upper side of the front support frame and the first side
Can be used as the support portion of the seat portion, and the second steeply inclined portion of the side frame and the second reinforcement frame can be used as the support portion of the backrest.

Further, it is formed of an elastically deformable metal material.
By combining frame members to form a skeleton,
The frame member is made of solid rods of the same diameter and the same material.
When combining the frame members, each frame
Forming a recess for positioning at the joint of the members,
A chair whose parts are fixed by a welding process , wherein a frame member having a bilaterally symmetrical shape in which a U-shaped curve is formed, an opening is arranged upward, and both ends are bent horizontally is fixed at the horizontal end. To form a base frame, and a first bent portion extending rearward from the left and right front sides of the base frame is provided with a first bent portion to form a gentle inclined portion. The second bent portion is extended to form a second steeply inclined portion and extends rearward to form a side frame, and the second bent portion of the side frame and the rear horizontal portion of the base frame are fixed to each other, A reinforcing frame is installed between the second steep slopes of the side frame.

The front and rear upper sides of the base frame can be used as a support portion for the seat portion, and the second steeply inclined portion of the side frame and the reinforcing frame can be used as a backrest support portion.

[0009]

In the frame structure of the chair constructed as described above, the material cost of the frame member is suppressed and the processing is facilitated by forming the frame member only with solid rods having the same diameter and the same material. When the frame members are assembled, a concave portion for positioning is formed in the joint portion of each frame member, and the concave portions are fitted into the concave portions to make a line contact, so that the area to be welded is increased and the fixing can be securely performed.

Both ends of a U-shaped curved frame member are arranged forward to form a base frame, and a first steeply inclined portion is raised rearward from both ends of the base frame.
A first bent portion is provided on the first steep slope portion to form a gentle slope portion, the gentle slope portion is extended rearward to form a second bent portion, and a second steep slope portion is formed. The side frame is formed by extending backward, the first reinforcing frame is installed between the second bent portions of the side frame, and the second reinforcing frame is installed between the second steeply inclined portions to form a U-shape. Both ends of the curved front support frame are erected on both ends of the base frame, and a third reinforcing frame is erected between the intermediate portion of the base frame and the side frame and the front support frame. The side frame receives bending stress and is elastically deformable, and the impact when seated can be softened. Further, since welding is performed to fix each member, there is no fear of loosening during use, and sufficient rigidity can be provided.

Further, the upper side of the front support frame and the first reinforcing frame serve as a seat supporting portion, and the second steep slope portion and the second reinforcing frame of the side frame serve as a back supporting portion. As a result, the frame structure can be effectively used and the load can be transmitted to the side frame without waste.

A frame member having a bilaterally symmetrical shape in which a U-shaped curve is formed and an opening is arranged upward and both ends are horizontally bent is fixed to the horizontal end to form a base frame. A first bent portion extending rearward from the left and right front sides of the first bent portion to form a gentle inclined portion, and the gentle inclined portion extended rearward to provide a second bent portion, A second steep portion of the side frame is formed by forming a second steep portion and extending rearward to form a side frame, and fixing a second bent portion of the side frame and a rear horizontal portion of the base frame. By arranging the reinforcing frame between them, the load can be received by the entire base frame, and the side frame can elastically deform and absorb the impact against the load applied to the backrest.

By using the front and rear upper sides of the base frame as the support portion of the seat portion, and the second steeply inclined portion of the side frame and the reinforcing frame as the support portion of the backrest,
The frame structure can be effectively used and the load can be transmitted to the base frame without waste.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the first frame structure of the present invention shown in FIG. 1, only solid rods having the same diameter and the same material are used. The solid rod is preferably made of metal such as iron. A solid rod bent in a U shape is used as the base frame 1, and both ends 1a, 1a
To the front. The side frames 2 and 2 are welded rearward near both ends 1a and 1a. The side frames 2 and 2 are
A first bent portion 2b is provided above the first steep inclined portion 2a to form a gentle inclined portion 2c, and a second bent portion 2d is provided behind the gentle inclined portion 2c. The steep slope 2e is formed. A first reinforcing frame 4 is installed between the second bent portions 2d, 2d, and a second reinforcing frame 5 is installed between the recesses 3 and 3 provided in the middle of the second steep slope 2e. Also,
Both ends 1a, 1a of the base frame 1 are erected by welding the ends of the front support frame 6 curved in a U shape. Furthermore, the recesses 3 are formed in the middle of the base frame, and the third reinforcing frame 7 is provided between the recesses 3 and the recesses 3 provided in the first steep slope 2a of the side frame 2 and the front support frame 6. , 7 are installed by welding.

A seat portion 8 is attached across the upper side 6a of the front support frame 6 and the first reinforcing frame 4, and the backrest 9 is mounted on the second steep slope portion 2e of the side frame 2 and the second reinforcing frame 5. Install.

The function of this embodiment is that a solid rod is used as the frame member and the frame is elastically deformable when a load is applied. Therefore, the frame itself has a function as a cushion, and the seat is seated when seated. The impact applied to the portion 8 and the backrest 9 is absorbed by the side frame 2 flexing around the joint between the side frame 2 and the third reinforcing frame provided on the first steep slope 2b as a fulcrum. Further, since the solid rod has the same diameter and the same material, the material cost and the processing cost of the frame member can be suppressed. When assembling the frame members, the recesses 3 for positioning are formed at the joints of the respective frame members, and the frame members to be combined with the recesses 3 are fitted and welded. Increase. Further, since each member is fixed by welding, it is possible to always have a sufficient strength without fear of loosening due to repeated load.

Further, the upper side of the front support frame 6
The seat structure 8 is supported by the 6a and the first reinforcing frame 4, and the backrest 9 is supported by the second steeply inclined part 2e of the side frame 2 and the second reinforcing frame 5, thereby effectively utilizing the frame structure. In addition, the load can be transmitted to the side frame 2 that functions as a cushion without waste.

Next, FIG. 2 shows a second frame structure of the present invention. Also in this embodiment, only solid rods having the same diameter and the same material are used. The base member 10 is formed by bending the frame member into a U shape, arranging the openings upward, bending both ends horizontally, and fixing the ends by welding.
The recesses 3 are provided on the front sides 10a, 10a of the base frame 10,
The side frames 11, 11 whose ends are welded to the recesses 3 are extended rearward. The side frame 11 is provided with a first bent portion 11b at a first steeply inclined portion 11a which starts from the recess 3 and a gently inclined portion 11c. The gently sloping part 11c is extended rearward and the second
The bent portion 11d is provided to form the second steep slope portion 11e.
The second bent portion 11d and the rear upper side 10b of the base frame 10 are fixed to each other by welding. The recess 3 is provided in the steep slope 11e,
The reinforcing frame 12 is installed between the recesses 3 and 3 by welding.

The front and rear upper sides 10b of the base frame 10
The seat 8 is attached to the backrest 9, and the backrest 9 is attached to the second steep slope 11e of the side frame 11 and the reinforcing frame 12.
The above functions as a chair.

In the second frame structure, the impact applied to the seat portion 8 when seated is absorbed by the bending of the entire base frame, and the impact applied to the backrest 9 is absorbed.
11 is the second bent portion 11d and the rear upper side of the base frame 10.
It is absorbed by bending around the joint with 10b as a fulcrum. Since the impact and load are dispersed and received by each frame, stress is not concentrated on a part of the frame.
The description of other operations similar to those of the first frame structure will be omitted.

[0022]

As described above in detail, according to the chair of the present invention, since the solid rod is used as the frame member, the frame itself has a function as a cushion, and the impact applied when sitting is applied. Since it absorbs, it is not necessary to incorporate a spring or a damper device into the frame structure in order to improve the sitting comfort, and an excellent sitting comfort can be obtained by using a cushion material or the like together with the seat portion.

By forming the frame member only with solid rods having the same diameter and the same material, the material cost of the frame member can be suppressed and the processing can be facilitated. There is no need to apply rust-proof treatment to the inner cylinder like a pipe. Further, when the frame members are assembled, a concave portion for positioning is formed in the joint portion of each frame member, and the joint portion makes a line contact by being fitted into the concave portion, so that the area to be welded increases and the fixing is surely performed. be able to. Therefore, it is not necessary to newly use a mounting member.

Further, by supporting the seat portion by the upper side of the front supporting frame and the first reinforcing frame, and by supporting the backrest by the second steeply inclined portion of the side frame and the second reinforcing frame, the frame is supported. Use the structure effectively,
The number of constituent members can be suppressed. In addition, the load can be transmitted to the side frame that functions as a cushion without waste, and the overall design can be simplified.

In the chair using the second frame structure, shocks and loads are dispersed and received by each frame, so that stress is not concentrated on a part of the frame.
Therefore, higher durability can be provided.

[Brief description of drawings]

FIG. 1 is a schematic view of a chair having a first frame structure of the present invention.

FIG. 2 is a schematic view of a chair having a second frame structure of the present invention.

[Explanation of symbols]

1 base frame 1a both ends 2 side frames 2a First steep slope 2b First bend 2c gentle slope 2d second bend 2e Second steep slope 3 recess 4 First reinforcement frame 5 Second reinforcement frame 6 Front support frame 6a Upper side 7 Third reinforcement frame 8 seats 9 backrest 10 base frame 10a front side 10b upper side 11 side frame 11a First steep slope 11b First bend 11c gentle slope 11d Second bend 11e Second steep slope 12 Reinforcement frame

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-67809 (JP, A) Jitsuko Sho 35-28323 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) A47C 5/04

Claims (4)

(57) [Claims] 1. A forms a skeleton by combining frame members forming an elastically deformable metal material, same diameter the frame member, formed by solid bar of the same material,
When combining the frame members, it is a chair in which a concave portion for positioning is formed in the joint portion of each frame member, and the joint portion is fixed by welding , and both ends of the frame member curved in a U shape are Placed in front
As a base frame, from both ends of the base frame
Start up the first steep slope toward the rear and
The first bent portion is provided on the slanted portion to form the gently inclined portion,
The second bent portion is provided by extending the slanted portion rearward, and the second steep slope is formed.
Form a sloping part and extend it backward to form a side frame
The first reinforcement between the second bent portions of the side frame.
The frame is installed and the second reinforcement frame is installed between the second steep slopes.
Of the front support frame with a U-shaped curve
Install both ends on both ends of the base frame, and
Middle part of the base frame and the side frame and front support
A third reinforcing frame must be installed between the holding frame and
Chair characterized by and. 2. The upper side of the front support frame and the first reinforcement frame serve as a seat support portion, and the second steep slope portion and the second reinforcement frame of the side frame serve as a backrest support portion. The chair according to claim 1 , wherein: 3. A frame formed of an elastically deformable metal material.
Forming a skeleton by combining frame members
Form the ram members with solid rods of the same diameter and the same material,
When combining the frame members, each frame member
A recess for positioning is formed in the joint part of
A chair fixed by a welding process , in which a frame member having a bilaterally symmetrical shape in which a U-shaped curve is formed, an opening is arranged above, and both ends are bent horizontally is fixed at the horizontal end and the base is formed. A frame is formed, and a first bent portion is provided on a first steep slope portion extending rearward from the left and right front sides of the base frame to form a gentle slope portion, and the gentle slope portion is extended rearward. The second bent portion is provided, the second steeply inclined portion is formed, and it is extended rearward to form a side frame,
A chair characterized in that a second bent portion of the side frame and a rear horizontal portion of the base frame are fixed to each other, and a reinforcing frame is provided between the second steeply inclined portions of the side frame. 4. The front and rear upper sides of the base frame serve as a support portion for a seat portion, and the second steep slope portion and the reinforcing frame of the side frame serve as a backrest support portion. The chair described in 3 .