KR200284313Y1 - A chair frame with back frame capable of flexible movement - Google Patents

Abstract

In a chair frame consisting of a leg frame, a seat frame and a back frame, the back frame comprises a lower part where the waist of the body contacts and an upper part of an upper part thereof, and the lower part is cut into two parts and includes a cutting surface. The outer circumferential surface of the lower portion is surrounded by one or more springs, and both ends of the spring constitute a resilient backrest frame, which is fixed to the outer circumferential surface of the lower portion, so that the seated person is fixed to the position of the lower body of the body. As needed, only the position of the upper body can be easily flipped back, thus providing comfort to the seated person. In addition, since the structure of the back frame is simple, it is easy to manufacture and is directly exposed to the outside, so it is easy to recognize the failure and repair, and can be used as a design element for improving the aesthetics of the chair.

Description

A chair frame with back frame capable of flexible movement

The present invention relates to a chair frame having a back frame, and more particularly to a chair frame that can be manufactured economically with a back frame that is elastically folded.

With the introduction of Western civilization, the "dental life" has become more common by gradually shifting to a "dental life", which is a method of sitting on the floor and using a rug such as a chair or sitting on a sofa.

A chair or sofa representing a standing life is one of furniture that is installed in various spaces such as a home, an office, or a business place to allow a user to see a necessary task or take a rest while sitting.

Such chairs or sofas are largely divided into those with and without backs, and in order to prevent spinal vaginal disease such as scoliosis due to poor posture, chairs with backs are more preferable. A chair frame for forming a chair with a backrest includes a leg frame, a seat frame, and a backrest frame. The chair frame may be divided into four types according to a connection state thereof, one of which is illustrated in FIG. 1.

In the chair frame of FIG. 1, a pair of leg frames 10 are integrated by a cross connection 13, and a back frame 18 on which a seat frame 12 and a backrest 19 on which the seat plate 15 is placed is covered. ) Is integrated. The seat frame 12 is fixed to the horizontal portion 11 of the leg play 10 by bolts and nuts or by welding.

Another type of chair frame may include a separate seat frame, a front part of the leg frame connected to each other, a rear part of the leg frame connected to the back frame, and another form of the seat frame, leg frame and back frame If all of them are connected and made integrally or these frames may be prepared independently and interconnected by fastening means such as bolts and nuts.

When seated with a seat plate and a backrest in a chair frame having a backrest frame including FIG. 1, the chair frame is preferably flipped back according to the force applied by the seater rather than being fixed in order to provide comfort to the seater. Various studies have been conducted to devise such a chair frame.

2a and 2b show a chair frame with such a backrest means.

FIG. 2A discloses a technique in which the back frame 18 is flipped back in a chair frame in which the back frame 18 and the seat frame 12a are integrally formed. After cutting the rear end of the seat frame (12a) and the front end of the back frame 18 divided into two parts, the elastic bar 21 and the elastic bar to elastically support the back frame 18 in the cut frame The stopper 22 which wraps around both ends of 21 is inserted, and the pin (25a, 25b formed in the stopper 22 and the pinhole 26a, 26b formed in the cut part of the seat frame 12a) By inserting 23 and 24 to connect the seat frame 10 and the back frame 18 divided into two parts, the back frame 18 is flipped back while being elastically supported by the elastic bar 21.

In addition, in FIG. 2B, a pair of pivoting fixing pieces 27 having inclined surfaces 27a inserted into the seat frame 12 are inserted into both cut or separated ends of the back frame 18 and the seat frame 12. By connecting the pair of pivotal fixing pieces 27 to the support pipe 29 into which the torsion spring 28 is inserted, the backrest frame 18 is driven backward by the seating force within the range of the inclination angle of the inclined surface. Designed to be flipped

However, the chair frame of FIGS. 2A and 2B is provided with a back frame retracting means for providing comfort to the seated occupant. However, in order to mount the backrest retracting means, between the seat frames 12 and 12a and the back frame 18 are provided. It is necessary to prepare a support pipe 29 into which a pair of pivotal fixing pieces 27 and a torsion spring 28 are inserted having an elastic bar 21, a stopper 22, and an inclined surface 27a to be inserted. They must be precisely sized so as not to be too loose or too tight when inserted into the seat frames 12, 12a and back frame 18. FIG. That is, it is not so easy to manufacture the backrest retracting means.

On the other hand, when such a back rest means breaks down, the seat frame 12 and the back frame 18 are separated, and the elastic bar 21, the stopper 22, and the pivoting fixing piece 27 inserted therein. Or the torsion springs 28 need to be taken out and replaced, which makes the repair process complicated. Moreover, in order to improve the appearance of the chair, such a back support means is often formed on the seat frame 12 covered with the seat plate (15 of FIG. 1) so as not to be exposed to the outside. In this case, the seat plate (15 of FIG. 1) There is inconvenience to be separated.

Accordingly, an object of the present invention is to provide a chair frame having a backrest frame that can be elastically flipped while having a simple configuration, which can simplify the manufacturing and repair process and improve the aesthetic appearance of the chair.

1 shows a perspective view of an example of a general chair frame.

2a and 2b show a perspective view of a chair frame having a backrest frame which is moved according to the prior art.

Figure 3 shows an exploded perspective view of a chair frame having a backrest frame elastically folded according to an embodiment of the present invention.

4A and 4B show perspective views of other examples of a chair frame having a retracted backrest frame according to the present invention.

An object of the present invention is a chair frame consisting of a leg frame, a seat frame and a backrest frame, the backrest frame is divided into a lower portion and the upper portion of the upper portion in contact with the waist of the body, the lower portion is cut into two parts, The outer circumferential surface of the lower portion including the cut surface is surrounded by one or more springs, and both ends of the spring may be fixed to the outer circumferential surface of the lower portion by welding or the like, thereby realizing a back frame that is elastically flipped according to the back support of the seated person. Here, the degree of wetting of the backrest frame may be determined according to the length of the spring, the number of turns of the spring, the thickness of the spring, or the material constituting the spring.

Such a spring is easy for a chair frame in which the back frame and the seat frame are integrally formed, a chair frame or leg frame in which the leg frame and the back frame are integrally formed, and a chair frame in which the backrest frame and the seat frame are integrally formed. Can be applied.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 shows an exploded perspective view of an example of a chair frame having a back frame according to the present invention.

The seat frame 34 on which the seat plate 35 is placed consists of a pair of pipes bent at a predetermined angle, which are fixed to each other by welding means or fixing means made of bolts and nuts. One end of the seat frame 34 is connected to the front portion 30 of the leg frame. The rear part 32 of the leg frame is integrally formed with the back frame, and the interface between the back frame and the leg frame 32 is welded to the other end of the seat frame 34 or connected by fixing means. The lid 32 is fitted to the ends of the leg frames 30 and 32. The backrest frame consists of an upper portion 37 to which the back of the body is in contact with a lower portion 38 to which the waist is in contact. And the lower end portion 38 is in contact with the waist portion is cut at a predetermined position is divided into two parts, the outer peripheral surface of the lower portion 38, including the cut portion is surrounded by a spring 39, of the spring 39 Both ends are welded or fixed to the outer circumferential surface of the lower portion 38 by fixing means. Even if the spring 39 is not fixed to the outer circumferential surface of the lower portion 38 by welding or using fixing means, the upper portion 37 and the lower portion (even though the chair is lifted due to the tightening force of the spring 39) 38) is not easily separated.

Here, the waist portion refers to the portion from the bottom touching the seat plate 35 to the waist line is formed, and the position of the upper portion is defined as the portion where the back is in contact.

One of the methods for manufacturing the chair frame having the above-described structure is as follows. First, a pair of bent seat frames 34 are welded to each other, and then one end of the seat frame 34 is connected to the leg frame 30 by welding. And the other end of the seat frame 34 is fixed to the portion corresponding to the interface between the leg frame 32 and the lower portion 38 of the backrest frame by welding. Next, the spring 39 is inserted from the top of the lower portion 38. Since the spring 39 has elasticity, the size of the lower portion 38 may be expanded so that the lower portion 38 may be inserted, and thus the outer circumferential surface of the lower portion 38 may be wrapped with the spring 39 without a separate tool. Then, the upper portion 37 of the back frame is pushed into the spring 39. The upper portion 37 and the lower portion 38 in the spring 39 are spaced a predetermined distance apart.

On the other hand, after completion of the chair frame, the bolt 41a is inserted into the hole 42a formed in the upper portion 37 to fix the backrest cover 40 constituting the substantial backrest to the upper portion 37. In the same manner, the seat plate 35 is connected to the seat frame 34 by inserting the bolt 41b into the hole 42b formed in the seat frame 34. By the way, the connection of the back cover 40 and the seat plate 35 may be carried out during the manufacturing process of the chair frame. After connecting the leg frames 30 and 32 to the seat frame 34, the seat plate 35 may be fixed to the seat frame 34. On the other hand, the back cover 40 is fixed to the upper portion 37. Then the upper portion 37 and the lower portion 38 may be fitted to the spring 39 to be coupled.

If you want to take a break after studying or working by sitting on the seat plate 35 of a chair having a chair frame manufactured by the above methods, or during a performance during a meeting or watching a movie, etc. Leans back. When the back is folded back, the leg frames 30 and 32 should be able to lean back only the back part, that is, the upper body of the body, while maintaining the sitting position while being laid on the floor. To provide.

That is, when the back is folded back, an external force (back support force of the seater) is applied to the backrest 37 of the backrest frame. However, since the lower part 38 of the back frame is cut into two parts, the upper part of the lower part 38 is flipped back by an external force, and the lower part being flipped back by the spring 39 surrounding the cutting part. The upper part of (38) is supported with restoring force. When the backrest 37 is turned down according to the force applied by the seated occupant, the back frame is returned to its original state by restoring force of the spring 39 when the back position, ie, the back, which is turned upright, is used to study or work. Will come back. Here, the degree of the back frame can be easily determined by changing the material properties of the material used as the spring 39, that is, the elastic modulus, the number of windings of the spring, the distance between the windings, the length of the spring 39, and the like.

3 shows a chair frame in which two springs 39 are installed, but the present invention is not limited thereto, and the number of springs that enable the backrest to be folded may be one or three or more. FIG. 5A shows a chair frame in which a pair of leg frames 50, a seat frame 52, and a back frame 57 (upper portion, 56a, 56b, 56c; lower portion) are integrated with three springs 59a, 59b, 59c), Figure 5b is connected to the six feet 61, the support frame 63 supporting the seat frame 64 and the back frame 66 connected to the seat frame 64 (upper) In the chair frame having a portion 66 (lower portion), a spring 71 according to the present invention is applied to an office chair having one lower portion 67 of the backrest frame.

Unexplained numerals 54 and 65 denote seat plates, 58 and 70 denote backrests, 53 denotes a connecting portion connecting the pair of leg frames 50, and reference numerals 60a, 60b and 60c denote cut surfaces. In addition, reference numeral 62 denotes a roller for enabling the movement of the chair.

On the other hand, the present invention can be applied to all kinds of chairs, such as a chair with an armrest, a chair having two backrests, without changing its basic structure at all, and can be applied to a sofa or the like in addition to a chair. In addition, the present invention can be easily applied to a chair frame and an integrally connected chair frame in which a leg frame, a seat frame, and a back frame are separated into three. In other words, the lower part of the backrest frame which is in contact with the waist portion is cut into two parts and then wrapped around the lower part of the backrest frame including the cut surface with a spring.

According to the present invention, the lower part of the backrest frame is cut into two parts without changing the basic structure of the chair frame used in the past, and then the outer circumferential surface including the cut surface is fixed with a spring to secure the seated person's lower body. The position can be easily flipped back only as needed in the fixed state, it can be manufactured in a simple manner and at the same time can provide comfort to the seated person.

In addition, since the springs 39, 59a, 59b, 59c, and 71 are directly exposed to the outside, when the spring 39 is broken, failure can be recognized immediately, and to remove the broken spring and replace it with a new spring. It is easy to repair the trouble by melting the welded part or unscrewing the nut.

In addition, if the thickness of the springs 39, 59a, 59b, 59c, and 71, the color of the spring, the material of the material constituting the spring, etc. are appropriately selected, there is an advantage that the aesthetic appearance of the chair can be further increased.

Claims (6)

A chair frame consisting of a leg frame, a seat frame and a back frame, The back frame is composed of a lower part and a upper part of the upper part of which the waist of the body is in contact with the lower part, and the lower part is cut into two parts, and the outer circumferential surface of the lower part including the cutting surface is surrounded by one or more springs. Both ends of the chair frame having a retractable backrest frame, characterized in that is fixed to the outer peripheral surface of the lower portion. According to claim 1, wherein the length of the spring, the number of turns of the spring, the thickness of the spring or the degree of the back frame of the reinforcement characterized in that the reinforcement of the back frame is determined according to the material constituting the spring Having chair frame. The chair frame according to claim 1, wherein both ends of the spring are fixed to an outer circumferential surface of the lower end of the back frame by welding. The chair frame having an elastically reclining backrest frame according to claim 1, wherein said backrest frame and said seat frame are integrally formed. The chair frame having an elastically reclining backrest frame according to claim 1, wherein said leg frame and said backrest frame are integrally formed. The chair frame according to claim 1, wherein the leg frame, the back frame, and the seat frame are integrally formed.