KR20230130348A - Chair and hinge structure assembly thereof - Google Patents

Abstract

A chair with an amplified rotation angle of a leg support frame and a hinge structure therefor are provided. The chair includes a seat frame; a fixed link whose position is fixed to the seat frame; a connection link rotatably connected to the fixed link; an operating link rotatably connected to the connecting link and gear-coupled with the fixed link; and a leg support frame whose position is fixed to the operating link.

Description

Chair and hinge structure assembly therefor {CHAIR AND HINGE STRUCTURE ASSEMBLY THEREOF}

The present invention relates to a chair in which the rotation angle of the leg support frame is amplified and a hinge structure assembly therefor.

A chair is a general term for a device used for people to sit. The uses of chairs are very diverse, but for example, they can be used for a person's rest, such as a sofa or armchair, or to maintain a sitting position for a long time, such as a car seat or desk chair.

This type of chair is mainly equipped with a seat to support the person's buttocks and a back to support the back so that the person can sit on the seat and lean on the back, and has been developed to provide comfort and comfort. Furthermore, recently, chairs have been designed to minimize the load on joints such as a person's neck and spine through ergonomic design while providing comfort.

KR 10-2022-0010394 A KR 10-1346559 B1 KR 10-1897103 B1 KR 20-2018-0000993 U KR 20-2014-0001232 U KR 20-0492493 Y1 KR 20-2018-0002887 U

Recently, chairs have been provided that are additionally provided with a leg support plate or a leg support plate in addition to the seat and back plate. The leg support plate functions to improve comfort by supporting a person's legs, such as the calf and/or thigh, or to prevent back pain caused by mismatch between the height of the seat plate and the length of the leg in a sitting state. Patent Documents 1 to 7 disclose chairs for various purposes including leg support plates.

In general, when the leg support plate is not in use, it is maintained in a folded state under the seat plate, and when in use, it rotates and unfolds based on the seat plate to support a person's legs. At this time, it may be considered to use a linear actuator such as an electric cylinder to rotate the leg support plate.

The rotation angle of the leg support plate may vary depending on the purpose of the chair, but may be, for example, about 120 degrees or more, or about 130 degrees or more, or about 140 degrees or more, or about 150 degrees or more. At this time, it may be insufficient to provide a large rotation amount of the leg support plate using only the linear actuator.

If the linear momentum or momentum provided by the actuator is not sufficient, such as when the linear actuator cannot push the leg support plate all the way, a problem may occur in which the unfolded leg support plate is not fully supported or the leg support plate is not fully unfolded. Additionally, these problems can become worse as the lifespan of the chair deteriorates. In addition, when supporting the unfolded state of the leg support plate with a general linear actuator, it is vulnerable to the load applied to the leg support plate and damage to the actuator or hinge structure may occur.

Accordingly, the problem to be solved by the present invention is to provide a chair including a leg support plate configured to rotate at an amplified greater angle even when the linear actuator makes a relatively small straight movement.

Another problem to be solved by the present invention is to provide a hinge structure assembly including a hinge structure with an amplified rotation angle and a linear actuator.

Another problem to be solved by the present invention is to provide a hinge structure with an amplified rotation angle.

The problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

A chair according to an embodiment of the present invention for solving any of the above problems includes a seat frame; a fixed link whose position is fixed to the seat frame; a connection link rotatably connected to the fixed link; an operating link rotatably connected to the connecting link and gear-coupled with the fixed link; and a leg support frame whose position is fixed to the operating link.

The fixed link and the actuating link each have teeth and can engage with each other.

In some embodiments, the chair may further include a linear actuator rotatably connected to the connection link and configured to rotate the connection link relative to the fixed link according to length deformation.

When the connection link rotates by a first angle, the operating link may be configured to rotate by a second angle in the range of 1.5 to 2.5 times the first angle.

At this time, the maximum movable range of the operating link may be 140 degrees to 180 degrees.

The connection link may have a first rotation axis with the fixed link, a second rotation axis with the operation link, and a third rotation axis with the linear actuator.

In some embodiments, the chair may further include leg rest pads arranged to slide on the leg support frame.

Additionally, the leg support pad may be configured to slide in conjunction with the rotation angle of the connection link with respect to the fixed link.

The leg support frame may further include a first joint link rotatably connected to a point, and a second joint link rotatably connected to the first joint link and the leg support pad.

The chair may further include a wire coupled to the first joint link.

At this time, the wire is configured to be wound or unwound according to the rotation angle of the operation link, and in a first state in which a first acute angle is formed between the fixed link and the operation link, the wire is at least partially wound to form the leg support pad. In a second state that moves toward the seat frame and a second acute angle greater than the first acute angle is formed between the fixed link and the operating link, the wire is released and the leg support pad can move outward.

A hinge structure assembly according to an embodiment of the present invention for solving any of the above problems includes a fixed link whose position is fixed; an operating link coupled with a gear to the fixed link; and a connection link having a first to a third rotation axis, the hinge structure including a connection link rotatably connected to the fixed link through the first rotation axis, and rotatably connected to the operating link through the second rotation axis. and a linear actuator coupled to a third rotation axis of the connection link and configured to rotate the connection link based on the fixed link, wherein the first to third rotation axes are arranged in an acute triangle shape.

In the triangle, the interior angle on the second rotation axis side may have the maximum interior angle.

Additionally, in the triangle, the interior angle on the second rotation axis side is in the range of 70 degrees to 80 degrees, the interior angle on the first rotation axis side is in the range of 50 degrees to 60 degrees, and the interior angle on the third rotation axis side is in the range of 40 degrees to 50 degrees. It may be in range.

Specific details of other embodiments are included in the detailed description.

According to embodiments of the present invention, the rotation of the leg support frame may be amplified compared to the degree of torque or momentum actually provided by the actuator. Therefore, the leg support frame can be fully expanded with only a smaller amount of actuator momentum compared to the prior art, and more stable maintenance can be possible even when a load is applied to the leg support frame.

Effects according to embodiments of the present invention are not limited to the contents exemplified above, and further various effects are included in the present specification.

1 is a perspective view of a chair according to an embodiment of the present invention.
Figure 2 is a perspective view showing another state of the chair of Figure 1.
Figure 3 is an exploded perspective view of the chair of Figure 1.
Figure 4 is an exploded perspective view showing the hinge structure of Figure 3.
Figure 5 is a plan view showing the connection link of Figure 4.
Figures 6 to 8 are enlarged perspective views showing the vicinity of the hinge structure in the first to third states in which the leg support frame of the chair of Figure 1 rotates, respectively.
FIGS. 9 to 11 are side views showing the vicinity of the hinge structure in the first to third states in which the leg support frame of the chair of FIG. 1 rotates, respectively.
Figures 12 and 13 are plan layout diagrams showing the process of unfolding the leg support plate of the chair of Figure 1, respectively.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms, and only the embodiments serve to ensure that the disclosure of the present invention is complete, and those skilled in the art It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims. That is, various changes may be made to the embodiments presented by the present invention. The embodiments described below are not intended to limit the embodiments, but should be understood to include all changes, equivalents, and substitutes therefor.

The size, thickness, width, length, etc. of components shown in the drawings may be exaggerated or reduced for convenience and clarity of explanation, so the present invention is not limited to the form shown.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless clearly specifically defined.

Spatially relative terms such as 'above', 'upper', 'on', 'below', 'beneath', and 'lower' are used in the drawing. As shown, it can be used to easily describe the correlation between one element or component and other elements or components. Spatially relative terms should be understood as terms that include different directions of the element when used in addition to the direction shown in the drawings. For example, when an element shown in a drawing is turned over, an element described as 'below or beneath' another element may be placed 'above' the other element. Accordingly, the illustrative term 'down' may include both downward and upward directions.

As used herein, 'and/or' includes each and every combination of one or more of the mentioned items. Additionally, the singular form also includes the plural form unless specifically stated in the phrase. As used herein, 'comprises' and/or 'comprising' do not exclude the presence or addition of one or more other components in addition to the mentioned components. The numerical range expressed using 'to' indicates a numerical range that includes the values written before and after it as the lower limit and upper limit, respectively. ‘About’ or ‘approximately’ means a value or numerical range within 20% of the value or numerical range stated thereafter.

In this specification, when referring to components, ordinal modifiers such as 'first component', 'second component', '1-1 component', etc. are used to distinguish one component from another component. It just happens. Accordingly, the first component referred to below may be referred to as the second component within the scope of the technical idea of the present invention. For example, what is referred to as a first component in one embodiment may be referred to as a second component in another embodiment. Also, of course, what is referred to as a first component in the description of the invention may be referred to as a second component in the claims.

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

1 is a perspective view of a chair according to an embodiment of the present invention. Figure 2 is a perspective view showing another state of the chair of Figure 1. Figure 3 is an exploded perspective view of the chair of Figure 1.

1 to 3, the chair 11 according to this embodiment includes a seat frame 100, a chair base 200 supporting the seat frame 100, and a leg support frame capable of supporting the user's legs. (400) and the leg support pad 330 (or leg support plate, or leg support pad), the hinge structure 500 connecting the seat frame 100 and the leg support frame 400, and the momentum is applied to the hinge structure 500. It may include an actuator 600 that provides.

The seat frame 100 may be the framework of a chair on which a user can sit. The seat frame 100 includes a seat frame 110, a back frame 120, and a seat mechanism 150, and may further include a side frame 130.

The seat frame 110 may be the skeleton of a seat that supports the user's hips. Additionally, the back frame 120 may be a back frame that supports the user's back when the user sits and leans on the chair 11. 1 and the like illustrate a case where the seat frame 110 and the back frame 120 are mechanically connected by the side frame 130, but the present invention is not limited thereto. In addition, in this specification, the terms seat frame 110 and back frame 120 are indicated based on the function performed by a portion of the seat frame 100 of the chair 11 in relation to the body position of the seated user. However, this is only for clarity of explanation. For example, the seat frame and the back frame may be formed integrally, or may be connected by another additional frame connected for rotation of the back frame. Alternatively, the seat frame and the back frame may be formed integrally, or one or more of them may be omitted.

The seat mechanism 150 is disposed below the seat frame 110 to provide a predetermined adjustment function and to provide the center of gravity or mechanical stability of the chair 11. For example, the seat mechanism 150 adjusts the level of the gravity direction of the seat frame 110 based on the chair base 200 placed on the ground, or tilts the back frame 120 with respect to the seat frame 110. It can be configured as follows.

Although not shown in the drawings, a predetermined cushion member (or filler) and outer shell may be disposed on the seat frame 100. The cushion member may be provided to provide a cushioning feeling to the user like a sponge and at the same time hide the feel of the seat frame 100 made of a hard material such as metal or plastic. Additionally, the outer shell forms the outer surface of the chair 11 and can provide aesthetics. The material of the outer shell is not particularly limited, but may be a synthetic resin material or a leather material.

In some embodiments, side pads 310 may be disposed on the side frame 130. The side pads 310 may function as armrests.

The chair base 200 may include a center bar extending in the direction of gravity and a support portion extending in a plurality of directions from the lower end of the center bar. Figure 1 and the like illustrate a case where there are four support parts, but of course, the present invention is not limited thereto. There may be three, five, or six support units, and casters (not shown) may be coupled to the support units.

As described above, it is possible to provide a chair 11 that includes the seat frame 100 fixed by the chair base 200 and allows a user to sit on the seat frame 100 . 1 and the like illustrate a case where the chair 11 has the shape of an office desk chair, but of course, the present invention is not limited thereto. Within the scope of maintaining the core technical idea of the present invention, the chair may be implemented as an armchair such as a recliner, a sofa, a beauty chair, a massage device, a chair for transportation such as a car or airplane, a table chair, etc.

When the user sits on the seat frame 110, the hinge structure 500 is coupled to the vicinity of the seat frame 110 where the user's thighs are located, and the leg support frame 400 is connected to the seat frame through the hinge structure 500. Can be combined with (100). 3 and other examples illustrate a case where the hinge structure 500 is mechanically fastened to the seat mechanism 150 of the seat frame 100, but the present invention is not limited thereto. The joint position is not particularly limited as long as the hinge structure 500 can provide tilting or rotation between the seat frame 110 and the leg support frame 400, which will be described later, and may be used as an appropriate component of the seat frame 100, such as a seat frame. (110), etc. may be combined.

Hereinafter, the hinge structure 500 and the leg support frame 400 will be described in more detail with further reference to FIG. 4 and the like. Figure 4 is an exploded perspective view showing the hinge structure of Figure 3. Figure 5 is a plan view showing the connection link of Figure 4.

Referring further to FIGS. 4 and 5, the hinge structure 500 is rotatable with one or more fixed links 510, one or more connection links 530 rotatably connected to the fixed links 510, and the connection links 530. It may include one or more actuating links 520 connected to each other. The fixed link 510, the connecting link 530, and the operating link 520 may be provided in pairs, that is, two of each, in the width direction of the seat frame 100, but the present invention is not limited thereto.

In addition, the fixed link 510 may be fixed to the seat mechanism 150 of the seat frame 100, and the operating link 520 may be fixed to the leg support frame 400, which will be described later. The above fixing method may use bolt fastening, etc. While the fixed link 510 does not change its position relative to the seat frame 100, the operating link 520 and the connecting link 530 rotate or rotate relative to the fixed link 510 to form a fixed link 510. ) and can be configured to change the relative position.

First, the fixed link 510 (or ground link) may have a bar shape with a predetermined length. Additionally, a fixed link gear portion 510t may be formed on at least one end of the fixed link 510. The fixed link gear unit 510t may refer to a fixed link gear tooth or a fixed link tooth configured to adjust the rotation angle by engaging with the operating link gear unit 520t, which will be described later.

The vicinity of the one end of the fixed link 510 may be coupled to the first shaft 541. Hereinafter, the first shaft 541 may be used to refer to a shaft member or, if necessary, to refer to a rotation axis of the shaft member. At this time, the teeth of the fixed link gear portion 510t may be circularly arranged based on the center of the fixed link 510 formed by the first shaft 541.

Likewise, the operating link 520 (or the second link) may be bar-shaped with a predetermined length. Additionally, an operating link gear portion 520t may be formed on at least one end of the operating link 520. The working link gear portion 520t engages with the fixed link gear portion 510t as described above. The operating link gear portion 520t may mean an operating link gear tooth or an operating link tooth.

A portion near the one end of the actuating link 520 may be coupled to the second shaft 542 . Hereinafter, the second shaft 542 may be used to refer to the shaft member itself or, if necessary, to refer to the rotation axis of the shaft member. At this time, the teeth of the operating link gear portion 520t may be circularly arranged based on the center of the operating link 520 formed by the second shaft 542.

The connection link 530 (or first link) may be rotatably coupled to the fixed link 510 and the operating link 520. For example, the connection link 530 may have a first connection link hole 531, a second connection link hole 532, and may further include a third connection link hole 533.

The first shaft 541 may be inserted into the first connection link hole 531 to form a rotation axis. That is, the fixed link 510 and the connecting link 530 may be rotatably connected through the first shaft 541. Additionally, the second shaft 542 may be inserted into the second connection link hole 532 to form a rotation axis. That is, the connecting link 530 and the operating link 520 may be rotatably connected through the second shaft 542. As will be described later, the axis of the first shaft 541 may be an axis around which the remaining components of the hinge structure 500 except the fixed link 510 rotate based on the fixed link 510. Additionally, the axis of the second shaft 542 may be an axis around which the operating link 520 rotates based on the connecting link 530.

In some embodiments, a third shaft 543 may be inserted into the third connection link hole 533 to form a rotation axis. The connection link 530 and a linear actuator 600 such as an electric cylinder may be rotatably connected through a third shaft 543. However, the present invention is not limited to this, and the actuator 600, which provides momentum according to length deformation, may be coupled to the connection link 530 in another way to transmit rotational energy to the connection link 530. The linear momentum provided by the actuator 600 changes the position of the axis of the third shaft 543 around the axis of the fixed link 510 and the first shaft 541, and as a result, the position of the axis of the first shaft 541 changes. The connection link 530 can be rotated around the axis.

In this specification, if necessary, the hinge structure 500 and the linear actuator 600 coupled with the hinge structure 500 to operate the hinge structure 500 may be collectively referred to as a hinge structure assembly.

The first to third connection link holes 531 to 533 of the connection link 530 according to this embodiment, which are specifically designed for the above operation, may have a unique arrangement.

The first to third connection link holes 531 to 533 may have a substantially triangular shape, for example, an acute triangle shape. At this time, the triangle may be formed by connecting the center points of each hole 531, 532, and 533.

At this time, the first inner angle ( θ1 ) on the side of the triangular first connection link hole 531 (or the rotation axis of the first shaft 541) is about 50 degrees to 60 degrees, or about 53 degrees to 57 degrees, or It is in the range of about 54 degrees to 56 degrees, and the second inner angle ( θ2 ) on the side of the second connection link hole 532 (or the rotation axis of the second shaft 542) is about 70 degrees to 80 degrees, or about 74 degrees to 74 degrees. It is in the range of 78 degrees, and the third inner angle ( θ3 ) on the third connection link hole 533 (or the rotation axis of the third shaft 543) is in the range of about 40 degrees to 50 degrees, or about 46 degrees to 50 degrees. There may be. Additionally, the second interior angle ( θ2 ) may be the largest and the third interior angle ( θ3 ) may be the smallest.

In some embodiments, if necessary, the portion where the fixed link gear portion 510t of the fixed link 510 and the operating link gear portion 520t of the operating link 520 are engaged is provided with a cover plate 560 on the inside and/or outside. can be obscured by

Meanwhile, a first pulley 571 may be disposed on the first shaft 541 and its rotation axis, and a second pulley 572 may be disposed on the second shaft 542 and its rotation axis. The wire 700 may be at least partially wound around the first pulley 571 and the second pulley 572.

The leg support frame 400 may be fixed to the actuating link 520. A leg support pad 330 may be disposed on the leg support frame 400 to form a leg support plate or lifter together with the leg support frame 400. A cushion member (not shown) and a shell (not shown) are disposed on the leg support pad 330 to stably support the user's legs, for example, around the calf. The specific structure of the leg support frame 400 will be described later.

Hereinafter, the mechanical action of the hinge structure 500 and the hinge structure assembly of the chair 11 according to this embodiment will be described in detail with further reference to FIGS. 6 to 11. In this specification, the state in which the leg support frame 400 is completely folded as shown in FIG. 6 or 9 is referred to as the first state 11a, and the leg support frame 400 rotates and moves completely as shown in FIG. 8 or 11. The unfolded state is referred to as the third state 11c, and the state rotated at a certain angle between the first state 11a and the third state 11c as shown in Figure 7 or 10 is referred to as the second state 11b. ).

Figures 6 to 8 are enlarged perspective views showing the vicinity of the hinge structure in the first to third states in which the leg support frame of the chair of Figure 1 rotates, respectively. FIGS. 9 to 11 are side views showing the vicinity of the hinge structure in the first to third states in which the leg support frame of the chair of FIG. 1 rotates, respectively.

In the first state 11a, the angle between the bar-shaped fixed link 510 extending in one direction and the bar-shaped operating link 520 extending in one direction from the side view may form a minimum. Since the fixed link 510 is fixed in its relative position with the seat frame 100 and the operating link 520 is fixed in its relative position with the leg support frame 400, the leg support frame 400 is located at the lower part of the seat frame 100. It can be inserted as .

Subsequently, the hinge structure 500 may change to the second state 11b by the user's manipulation. That is, the actuator 600 extends forward, and due to the linear momentum provided, the connecting link 530 rotates clockwise around the rotation axis of the first shaft 541 and forms the second state 11b. there is. That is, torque may be applied to the connection link 530 by the actuator 600.

At this time, the rotational state of the position of the connection link 530 in the first state 11a, for example, the rotation angle of the position of the connection link 530 in the second state 11b is the first connection link rotation angle α1 ) can be defined as. Specifically, the rotation angle of the connection link 530 based on the first connection link hole 531 (i.e., the rotation axis of the first shaft 541) of the connection link 530 is the first connection link rotation angle ( α1 ) may correspond to. Figure 10 shows a case where the first connection link rotation angle (α1) is defined using the virtual first reference line (L1) connecting the center of the first connection link hole 531 and the center of the third connection link hole 533 . Illustrate.

In addition, the rotational state with respect to the position of the operation link 520 in the first state 11a, for example, the rotation angle of the position of the operation link 520 in the second state 11b is the first operation link rotation angle β1 ) can be defined as. 10 shows a first operating link rotation angle ( β1 ) using a virtual second reference line L2 that passes through the rotation axis of the second shaft 542 of the operating link 520 and extends along the extension direction of the operating link 520. ) is defined as an example.

In an exemplary embodiment, the first actuating link rotation angle β1 is about 1.5 times to 2.5 times the first connecting link rotation angle α1 , or about 1.6 times to 2.4 times, or about 1.7 times to 2.3 times, or It may range from about 1.8 times to 2.2 times, or from about 1.9 times to 2.1 times. That is, when the connection link 530 rotates by the first connection link rotation angle α1 about the rotation axis of the first shaft 541, the bar-shaped operating link 520 rotates by 1.5 to 2.5 times. You can.

As described above, the actuator 600 rotates the connecting link 530, and the rotation of the connecting link 530 and the fixed link gear portion 510t of the fixed link 510 and the operating link gear portion of the operating link 520 The operating link 520 may rotate due to the relative gear action between 520t. At this time, the operating link 520 may rotate to an extent that is amplified by approximately twice the rotation angle of the connection link 530. And the leg support frame 400 is fixed to the operating link 520 and can move together.

Subsequently, the hinge structure 500 may change to the third state 11c by the user's manipulation. The actuator 600 extends further forward, and the connecting link 530 rotates further clockwise around the rotation axis of the first shaft 541 due to the linear momentum provided, forming the third state 11c. there is. The third state 11c may be a state in which the leg support frame 400 is fully rotated, that is, a fully unfolded state.

The second connection link rotation angle α2 is the rotation angle of the position of the connection link 530 in the third state 11c with respect to the position of the connection link 530 in the first state 11a , that is, the connection link The maximum range of motion ( α2 ) of 530 is about 70 degrees to 90 degrees, or about 70 degrees to 80 degrees, and the third state 11c relative to the position of the actuation link 520 in the first state 11a. The second operating link rotation angle ( β2 ), which is the rotation angle of the position of the operating link 520, that is, the maximum movable range ( β2 ) of the operating link 520 is about 140 degrees to 180 degrees, or about 140 degrees to 140 degrees. It could be 160 degrees.

As described above, in the hinge structure 500 of the chair 11 according to the present embodiment, the actuator does not directly transmit torque to the leg support frame 400, but the actuator 600 rotates the connecting link 530 and , the operating link 520 can be rotated by the inter-axis shape of the three-axis connecting link 530 and the gear coupling structure between the fixed link 510 and the operating link 520.

That is, because the rotation of the leg support frame 400 is amplified compared to the degree of torque or momentum actually provided by the actuator 600, the leg support is supported even when the linear momentum required by the actuator 600 is less than before. The frame 400 can be fully expanded. Additionally, even when a load is applied to the leg support frame 400, a more stable support state can be maintained. In addition, because the load of the leg support frame 400 is not entirely supported by the actuator 600 but also by the gear engagement of the fixed link 510 and the operating link 520, the load applied to the leg support frame 400 Damage to the actuator 600 due to this can be minimized.

Meanwhile, FIGS. 9 to 11 illustrate a case where the back frame 120 is not tilted when the leg support frame 400 rotates, but the present invention is not limited thereto. In another embodiment, the back frame 120 is configured to tilt with the rotation of the leg support frame 400 due to the operation of the actuator 600, or the back frame 120 is tilted through a separate operation from the leg support frame 400. ) can be configured to be folded.

In addition, in the chair 11 according to this embodiment, as the leg support frame 400 rotates by the hinge structure 500, the leg support pad 330 is moved simultaneously or in conjunction with the leg support frame 400. It may be configured to slide toward the end or outward. This will be explained further with reference to FIGS. 12 and 13.

Figures 12 and 13 are plan layout diagrams showing the process of unfolding the leg support plate of the chair of Figure 1, respectively. Figure 12 shows the first state and Figure 13 shows the third state.

Referring further to FIGS. 12 and 13, the leg support frame 400 according to this embodiment includes a first vertical portion 410, a second vertical portion 430 slidingly coupled to the first vertical portion 410, and a second vertical portion 430 that is slidingly coupled to the first vertical portion 410. 1 A horizontal portion 450 connecting the vertical portion 410 in the horizontal direction, a first joint link 471 rotatably coupled to the horizontal portion 450, and a first joint link rotatably coupled to the first joint link 471. It may include a second joint link (473).

The first vertical portion 410 may be provided as a pair in the width direction of the leg support frame 400. The above-described operating link 520 may be coupled near the end of the first vertical portion 410. Additionally, the first vertical portion 410 and the second vertical portion 430 may be slidingly coupled to each other. That is, while the position of the first vertical portion 410 is fixed, the second vertical portion 430 may slide to increase or decrease the length of the leg support frame 400. In addition, the leg support pad 330 is fixedly disposed on the second vertical portion 430 and can move together.

The first joint link 471 may be connected to the horizontal portion 450 to rotate about an axis. Additionally, a force to unfold the first joint link 471 may be applied using an elastic member such as a torsion spring 490. That is, the torsion spring 490 may provide a force to rotate the first joint link 471 in the form shown in FIG. 13.

The second joint link 473 may be connected to the first joint link 471. Specifically, one end of the second joint link 473 may be rotatably connected to the first joint link 471 about an axis. Additionally, the other end of the second joint link 473 may be rotatably connected to the leg support pad 330 about an axis. Accordingly, when the angle between the first joint link 471 and the second joint link 473 is small as shown in FIG. 12, for example, in the first state 11a, the leg support pad 330 is slid upward (or inward). 13, when the angle between the first joint link 471 and the second joint link 473 is large, for example, in the third state 11c, the leg support pad 330 is moved downward (or outward). It can be moved by sliding. At this time, as described above, the leg support pad 330 is coupled to the second vertical portion 430, allowing sliding movement in the longitudinal direction between the first vertical portion 410 and the second vertical portion 430.

As described above, the first joint link 471 and the second joint link 473 receive a force to widen the angle between them by the torsion spring 490, and the first joint link 471 uses the wire 700. ) and the second joint link 473 can be adjusted. One end of the wire 700 may be coupled to the first joint link 471. The wire 700 may be configured to be wound or unwound according to the rotation angle of the leg support frame 400, specifically, in conjunction with the rotation angle of the operating link 520.

For example, when the leg support frame 400 is in a folded state as in the first state 11a, the wire 700 is connected to the first pulley 571 and/or the first pulley 571 disposed on the first shaft 541. 2 It is at least partially wound around the second pulley 572 disposed on the shaft 542 and can pull the first joint link 471 upward (based on FIG. 12). Accordingly, despite the force provided by the torsion spring 490, the first joint link 471 moves in an approximately horizontal direction and the angle between the first joint link 471 and the second joint link 473 decreases, As a result, the leg support pad 330 can be moved upward.

On the other hand, when the leg support frame 400 is at least partially unfolded, such as in the third state 11c (or the second state 11b), the wire 700 is connected to the first pulley 571 and/or the second pulley. It is at least partially released on (572), and the angle between the first joint link 471 and the second joint link 473 increases by the force provided by the torsion spring 490, and as a result, the leg support pad 330 can be moved to the lower side (based on FIG. 13).

Although the description has been made above with a focus on embodiments of the present invention, this is merely an example and does not limit the present invention, and those skilled in the art will be able to understand the present invention without departing from the essential characteristics of the embodiments of the present invention. It will be apparent that various modifications and applications not exemplified above are possible.

Therefore, the scope of the present invention should be understood to include changes, equivalents, or substitutes of the technical ideas exemplified above. For example, each component specifically shown in the embodiments of the present invention can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

11: chair
100: Seat frame
200: chair base
400: Leg support frame
500: Hinge structure
600: Actuator
700: wire

Claims (12)

seat frame;
a fixed link whose position is fixed to the seat frame;
a connection link rotatably connected to the fixed link;
an operating link rotatably connected to the connecting link and gear-coupled with the fixed link; and
A chair, comprising a leg support frame with the actuating links and a fixed position. According to paragraph 1,
A chair wherein the fixed link and the operating link each have teeth and engage with each other. According to paragraph 1,
A chair further comprising a linear actuator rotatably connected to the connection link and configured to rotate the connection link relative to the fixed link according to length deformation. According to paragraph 3,
When the connecting link rotates by a first angle,
A chair configured to rotate the actuating link by a second angle ranging from 1.5 to 2.5 times the first angle. According to paragraph 3,
A chair wherein the maximum range of motion of the operating link is 140 degrees to 180 degrees. According to paragraph 3,
The above connection link is,
A first rotation axis with the fixed link,
a second rotation axis with the actuating link, and
A chair having a third rotation axis connected to the linear actuator. According to paragraph 1,
A chair further comprising a leg support pad arranged to slide on the leg support frame, wherein the leg support pad is configured to slide in conjunction with a rotation angle of a connection link with respect to the fixed link. In clause 7,
The leg support frame is,
A first joint link connected to rotate about one point, and
Further comprising a second joint link rotatably connected to the first joint link and the leg support pad,
The chair further includes a wire coupled to the first joint link. According to clause 8,
The wire is configured to be wound or unwound depending on the rotation angle of the actuating link,
In a first state in which a first acute angle is formed between the fixed link and the actuating link, the wire is at least partially wound so that the leg rest pad moves toward the seat frame,
In a second state in which a second acute angle greater than the first acute angle is formed between the fixed link and the operating link, the wire is released and the leg rest pad moves outward. Fixed link with fixed position;
an operating link coupled with a gear to the fixed link; and
A hinge structure including a connection link having a first to a third rotation axis, the connection link being rotatably connected to the fixed link through the first rotation axis, and the connection link being rotatably connected to the operating link through the second rotation axis; ,
A linear actuator coupled to a third rotation axis of the connection link and configured to rotate the connection link relative to the fixed link,
A hinge structure assembly wherein the first to third rotation axes are arranged in an acute triangle shape. According to clause 10,
In the triangle, the interior angle on the second rotation axis side has the maximum interior angle. According to clause 11,
In the above triangle,
The interior angle on the second rotation axis side is in the range of 70 degrees to 80 degrees,
The interior angle on the first rotation axis side is in the range of 50 degrees to 60 degrees,
A hinge structure assembly wherein the third rotation axis side interior angle is in the range of 40 degrees to 50 degrees.