KR102799205B1 - chair with structure in which the angle of the backrest and the position of the seat are interlocked - Google Patents

Abstract

The present invention relates to a chair in which a backrest angle and a seat position are linked, comprising: a center frame (110) formed of a vertical member (112) and a horizontal plate (114) coupled to an upper end of the vertical member; a seat (120) coupled to an upper end of the horizontal plate so as to be able to move relative to the front and rear in the direction of movement; a rail structure (R) provided between the horizontal plate and the seat so as to enable the front and rear movement of the seat; a first hinge portion (H1) provided at a rear end of the horizontal plate; a backrest (130) coupled to the first hinge portion and capable of adjusting the angle formed with the horizontal plate; a C-shaped plate spring (140) having one end coupled to a second hinge portion (H2) provided at a lower end of the horizontal plate and the other end coupled to a third hinge portion (H3) provided at a rear end of the backrest; It is configured to include a gap maintaining member (150) which is connected at one end to the first hinge part and at the other end to the fourth hinge part (H4) provided on the inside of the plate spring, thereby maintaining a constant gap between the first hinge part and the fourth hinge part.

Description

Chair with structure in which the angle of the backrest and the position of the seat are interlocked

The present invention relates to a chair having a structure in which the seat moves forward and backward in conjunction with the angle of the backrest when the angle of the backrest is adjusted. Specifically, the present invention relates to a structure in which the seat on which a user is sitting automatically moves forward in conjunction with the angle of the backrest when the angle of the backrest is tilted backward, thereby preventing the chair from falling over due to the weight being shifted backward when the backrest of the chair is tilted backward.

In general, chairs used in offices or homes are structured so that the user can use the chair with the backrest upright and then lean back to rest, allowing the user to lie down comfortably and rest. This technique of reclining the backrest is a common technique.

As modern people spend a lot of time sitting in a chair, such as working long hours in the office, they are utilizing the function of being able to sleep or rest in a comfortable position while sitting in a chair by leaning back the backrest to recover from fatigue.

However, since the existing chairs were designed so that only the backrest would be tilted backwards separately from the seat when adjusting the backrest angle, there was a problem that most of the upper body would be tilted toward the back of the center of the seat when the backrest was tilted backwards and the user leaned back. Because of this problem, when the backrest was tilted backwards and the user leaned back, the user's center of gravity moved to the back of the center of the seat where the support axis of the legs was connected, which caused a very unstable state or the user would fall backwards along with the chair.

To prevent this, the angle at which the backrest can be reclined is limited so that the backrest cannot be reclined beyond a certain angle, preventing a falling situation. However, this creates the problem of making it difficult to recline the backrest and rest comfortably.

Publication patent number 10-2010-0067912: Chair with a protruding backrest plate supporting the lumbar region

The present invention is intended to solve such problems, and aims to provide a chair structure that allows a user to rest comfortably with their body leaning back by preventing the center of gravity from moving backward even when the backrest of the chair is leaned back.

In addition, the present invention provides a structure that allows the seat of the chair to move forward exactly in proportion to the angle at which the backrest is reclined even when the backrest is sufficiently reclined without limitation on the angle at which the backrest is reclined, thereby providing a chair without the risk of tipping over even when the backrest is reclined.

The present invention relates to a chair in which a backrest angle and a seat position are linked, comprising: a center frame (110) formed of a vertical member (112) and a horizontal plate (114) coupled to an upper end of the vertical member; a seat (120) coupled to an upper end of the horizontal plate so as to be able to move relative to the front and rear in the direction of movement; a rail structure (R) provided between the horizontal plate and the seat so as to enable the front and rear movement of the seat; a first hinge portion (H1) provided at a rear end of the horizontal plate; a backrest (130) coupled to the first hinge portion and capable of adjusting the angle formed with the horizontal plate; a C-shaped plate spring (140) having one end coupled to a second hinge portion (H2) provided at a lower end of the horizontal plate and the other end coupled to a third hinge portion (H3) provided at a rear end of the backrest; It is configured to include a gap maintaining member (150) which is connected at one end to the first hinge part and at the other end to the fourth hinge part (H4) provided on the inside of the plate spring, thereby maintaining a constant gap between the first hinge part and the fourth hinge part.

In the chair of the present invention, when the backrest is tilted backward, the C-shape of the plate spring is deformed, and the distance between one end and the other end of the plate spring is deformed in a direction whereby the distance between the one end and the other end of the plate spring increases due to the spacing member, so that the second hinge part to which one end of the plate spring is connected moves forward, and as a result, the seat to which the second hinge part is connected moves forward.

The above rail structure comprises a first rail (R1) having a groove provided on one of the horizontal plate and the seat, and a second rail (R2) having a projection provided on the other of the horizontal plate and the seat and fastened to the groove to move forward and backward, and may further comprise a stopper that restricts the relative movement of the first rail and the second rail to stop the forward and backward movement of the seat.

In addition, the present invention as another embodiment comprises a center frame (110) comprising a vertical member (112) and a horizontal plate (114) coupled to an upper end of the vertical member; a seat (120) coupled to an upper end of the horizontal plate so as to be relatively movable in the forward and backward direction; a rail structure (R) provided between the horizontal plate and the seat so as to enable the forward and backward movement of the seat; a first hinge portion (H1) provided at a rear end of the horizontal plate; a backrest (130) coupled to the first hinge portion and capable of adjusting an angle formed with the horizontal plate; a C-shaped plate spring (140) having one end coupled to a second hinge portion (H2) provided at a lower end of the horizontal plate and the other end coupled to a third hinge portion (H3) provided at a rear end of the backrest; First, the backrest (130) is fixed to the rear and the other end is fixed to the plate spring (140), and the support frame (200) is included; when the backrest is tilted back, the C-shape of the plate spring is deformed, but the distance between one end and the other end of the plate spring is deformed in a direction whereby the distance between the one end and the other end of the plate spring increases by the support frame, so that the second hinge part to which one end of the plate spring is joined moves forward, and as a result, the seat to which the second hinge part is joined moves forward.

The present invention has a seat and backrest interlocking structure, so that when the backrest is tilted backward, the seat automatically moves forward, preventing the entire center of gravity of the user and the chair from moving backward, thereby eliminating the need to limit the angle of the backrest, and thus enabling the backrest to be tilted backward sufficiently, thereby providing the advantageous effect of allowing the user to rest in a more comfortable position.

Figure 1 is a side view of a chair having a structure in which the backrest angle and seat position are linked according to the present invention, with the backrest in an upright position.
Figure 2 is a side view of a chair having a structure in which the backrest angle and seat position are linked according to the present invention, with the backrest reclined.
FIG. 3 is an example showing a forward/backward movement structure of a seat as part of a chair according to the present invention.
FIGS. 4 and 5 are side views of a chair having a structure in which the backrest angle and the seat position are linked according to another embodiment of the present invention, with the backrest in an upright position and the backrest in a reclined position.

The purpose, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. In addition, the terms used are terms defined in consideration of the functions in the present invention, and may vary depending on the intention or custom of the user operator. Therefore, the definitions of these terms should be made based on the contents throughout this specification.

In addition, when describing the components of the present invention, different reference numerals may be given to components with the same name depending on the drawings, and the same reference numerals may be given to different drawings. However, even in such cases, it does not mean that the components have different functions depending on the embodiment, or that they have the same function in different embodiments, and the function of each component should be judged based on the description of each component in the embodiment.

In addition, the technical terms used in this specification should be interpreted as having a meaning generally understood by a person of ordinary skill in the art to which the present invention belongs, unless specifically defined otherwise in this specification, and should not be interpreted in an overly comprehensive or overly narrow sense. In addition, the singular expression used in this specification includes the plural expression unless the context clearly indicates otherwise.

In this application, the terms “consisting of” or “comprising” should not be construed to necessarily include all of the various components or various steps described in the specification, and should be construed to mean that some of the components or some of the steps may not be included, or that additional components or steps may be included.

In addition, in the following explanation, the expressions “front” and “forward” are defined to mean the front with respect to the user sitting on the chair, and the expressions “back” and “backward” are defined to mean the back with respect to the user sitting on the chair.

FIG. 1 and FIG. 2 are side views of a chair having a structure in which a backrest angle and a seat position are linked according to the present invention. FIG. 1 is a side view of a state in which the backrest is erected, and FIG. 2 is a side view of a state in which the backrest is reclined. FIG. 3 is an example showing a structure in which the seat can move forward and backward according to the backrest angle in the chair of the present invention.

The chair according to the present invention is the same as a general chair in that it has a seat (120) where the user sits, a backrest (130) that supports the user's back from the back, a central frame (110) in the shape of a vertical axis that supports the seat from below, and a wheel at the bottom. However, the present invention is characterized in that the seat automatically moves forward in conjunction with the movement of reclining the backrest of the chair.

Specifically, the center frame (110) of the present invention is composed of a vertical member (112) that is a vertical support member and a horizontal plate (114) that is coupled to the upper end of the vertical member. A seat (120) on which a user sits is positioned on the upper surface of the horizontal plate, and the seat of the present invention is coupled so as to be able to move relative to the front and rear directions.

A rail structure (R) is provided between the horizontal plate and the seat to enable forward-backward movement of the seat. This rail structure can have various structures and shapes, and any structure that is connected to the other and can move in the forward-backward direction is possible. One of them is illustrated in FIG. 3, and may be composed of a first rail (R1) having a groove provided on one of the horizontal plate and the seat, and a second rail (R2) having a protrusion provided on the other of the horizontal plate and the seat and connected to the groove to move in the forward-backward direction. In addition, in cases where it is necessary to limit the forward-backward movement of the seat or to stop it at a certain point, a configuration may be required to prevent further forward-backward movement. That is, a stopper may be further provided to restrict the relative movement of the first rail and the second rail and stop the forward-backward movement of the seat.

Referring to FIGS. 1 and 2, a first hinge part (H1) is located at the rear end of the horizontal plate. The 'hinge part' described below means a part where a member fastened thereto is fastened rotatably. The backrest (130) of the present invention is fastened to the first hinge part and is fastened to the horizontal plate, and is configured to be capable of adjusting the angle formed with the horizontal plate.

And, the present invention includes a plate spring (140), and the plate spring has an overall C-shaped semicircular shape, one end of which is coupled to a second hinge part (H2) provided at the lower end of the horizontal plate, and the other end is coupled to a third hinge part (H3) provided at the rear end of the backrest. And, the plate spring is deformable as a spring, stores elastic force when deformed, and utilizes the stored elastic force in the process of returning to a circular shape thereafter.

In addition, the present invention is characterized in that it includes a gap-maintaining member (150) that maintains the gap between the first hinge portion and the fourth hinge portion at a constant level. Due to the gap-maintaining member (150) of the present invention, even if the shape of the C-shaped plate spring (140) is deformed, the gap between the first hinge portion and the fourth hinge portion is maintained at a constant level, and as a result, the seat moves forward in conjunction with the shape of the plate spring that is deformed in conjunction with the backrest inclination angle. To this end, one end of the gap-maintaining member (150) is coupled to the first hinge portion, and the other end is coupled to the fourth hinge portion (H4) provided on the inside of the plate spring. The gap-maintaining member (150) is rotatably coupled at both ends thereof.

Due to the structure as described above, when the backrest of the chair of the present invention is tilted backward, the C-shape of the plate spring is deformed and the distance between one end and the other end of the plate spring is deformed in a direction that increases, and the second hinge part to which one end of the plate spring is joined moves forward. However, since the distance between the first hinge part and the fourth hinge part is maintained constant by the gap maintaining member (150), the seat to which the second hinge part is joined moves forward as a result. It is preferable that the plate springs (140) are respectively provided on the left and right sides of the horizontal plate to maintain left-right balance.

FIGS. 4 and 5 are side views of a chair having a structure in which the backrest angle and the seat position are linked according to another embodiment of the present invention, with the backrest in an upright position and the backrest in a reclined position.

The basic operating structure of the chair according to this embodiment is similar to that described in the chair of FIGS. 1 and 2, with the only difference being that the spacing member (150) is removed and a C-shaped support frame (200) is added.

In other words, the chair according to the present embodiment also includes a seat (120) and a backrest (130) that supports the user's back, a center frame (110) in the shape of a vertical axis that supports the seat from below, and wheels at the lowest point. In addition, the center frame (110) is composed of a vertical member (112) that is a vertical support member and a horizontal plate (114) that is coupled to the upper end of the vertical member, and a seat (120) on which the user sits is positioned on the upper surface of the horizontal plate. The seat of the present invention is coupled so as to be able to move relative to the front and rear directions. In addition, the present embodiment also includes a plate spring (140) that forms an overall C-shaped semicircular shape, one end of which is coupled to a second hinge part (H2) that is provided at the lower end of the horizontal plate, and the other end of which is coupled to a third hinge part (H3) that is provided at the rear end of the backrest. And, since the plate spring is the same in that it can be deformed as a spring, stores elastic force when deformed, and utilizes the stored elastic force in the process of returning to its original shape, a detailed explanation of the same parts will be omitted.

The only difference in this embodiment is that a support frame (200) is added. The support frame (200) is a sturdy frame made of a solid metal material and has a sturdy frame structure that does not change shape even when the backrest (130) is folded down. In FIGS. 4 and 5, the support frame (200) is formed in an overall C-shaped curve, but it does not necessarily have to have this shape and may have a T-shape. As described below, one end of the support frame (200) is fixed to the rear of the backrest (130) and the other end is fixed to the plate spring (140). In other words, one end of the support frame (200) is fixed to the rear of the backrest (130) and the other end is fixed to the rear of the plate spring (140) using the fifth hinge part (H5).

In the chair according to the present embodiment, when the backrest is tilted backward, the support frame (200) does not change shape due to its rigid structure, and therefore the C-shape of the plate spring is deformed. The deformation occurs in a direction in which the distance between one end and the other end of the plate spring increases, so that the second hinge part to which one end of the plate spring is joined moves forward, and as a result, the seat to which the second hinge part is joined moves forward. This movement enables stable backrest tilting.

According to the present invention, as the backrest is tilted backwards due to the seat and backrest linkage structure described above, the seat automatically moves forward, preventing the entire center of gravity of the user and the chair from moving backwards, so there is no need to limit the backrest angle, thereby eliminating the risk of tipping over, and thus enabling the backrest to be tilted back sufficiently, thereby enabling the user to rest in a more comfortable position.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

Claims (3)

A center frame (110) composed of a vertical member (112) and a horizontal plate (114) joined to the upper end of the vertical member;
A sheet (120) that is coupled to enable relative movement in the forward and backward directions at the top of the horizontal plate;
A rail structure (R) provided between the horizontal plate and the sheet to enable forward and backward movement of the sheet;
A first hinge portion (H1) provided at the rear end of the above horizontal plate;
A backrest (130) connected to the first hinge portion and capable of adjusting the angle formed with the horizontal plate;
A C-shaped plate spring (140) having one end joined to a second hinge portion (H2) provided at the lower portion of the horizontal plate and the other end joined to a third hinge portion (H3) provided at the rear end of the backrest;
It includes a gap maintaining member (150) which is connected at one end to the first hinge part and at the other end to the fourth hinge part (H4) provided on the inside of the plate spring, thereby maintaining a constant gap between the first hinge part and the fourth hinge part;
A chair having a structure in which the backrest angle and the seat position are linked, characterized in that when the backrest is tilted backward, the C-shape of the plate spring is deformed, and the distance between one end and the other end of the plate spring is deformed in a direction in which the distance between the one end and the other end of the plate spring increases by the spacing member, so that the second hinge part to which one end of the plate spring is connected moves forward, and as a result, the seat to which the second hinge part is connected moves forward. A center frame (110) composed of a vertical member (112) and a horizontal plate (114) joined to the upper end of the vertical member;
A sheet (120) that is coupled to enable relative movement in the forward and backward directions at the top of the horizontal plate;
A rail structure (R) provided between the horizontal plate and the sheet to enable forward and backward movement of the sheet;
A first hinge portion (H1) provided at the rear end of the above horizontal plate;
A backrest (130) connected to the first hinge portion and capable of adjusting the angle formed with the horizontal plate;
A C-shaped plate spring (140) having one end joined to a second hinge portion (H2) provided at the lower portion of the horizontal plate and the other end joined to a third hinge portion (H3) provided at the rear end of the backrest;
It includes a support frame (200) which is fixed at the rear of the backrest (130) and the other end is connected to the fifth hinge part (H5) provided in the plate spring (140);
A chair having a structure in which the backrest angle and the seat position are linked, characterized in that when the backrest is tilted backward, the C-shape of the plate spring is deformed, and the distance between one end and the other end of the plate spring is deformed in a direction in which the support frame increases, so that the second hinge part to which one end of the plate spring is connected moves forward, and as a result, the seat to which the second hinge part is connected moves forward. In paragraph 1 or 2,
It consists of a first rail (R1) having a groove provided on one of the horizontal plate and the sheet, and a second rail (R2) having a projection provided on the other of the horizontal plate and the sheet and which is fastened to the groove and moves forward and backward.
A chair having a structure in which the backrest angle and the seat position are linked, characterized in that it further comprises a stopper that restricts the relative movement of the first rail and the second rail and stops the forward and backward movement of the seat.

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