CHAIR

Abstract

The present disclosure relates to a chair, including: a base; a seat frame rotatably mounted on the base; a footrest bracket and a backrest bracket articulated with the seat frame, where the footrest bracket and the backrest bracket are staggered from a rotation axis of the seat frame relative to the base; a rod-linkage structure, including a first rod-linkage assembly connected between the base and the seat frame, and a second rod-linkage assembly connected between the seat frame and the footrest bracket; and a driving unit, used to drive the first rod-linkage assembly and the second rod-linkage assembly to operate, to link rotation of the seat frame and rotation of the footrest bracket.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 202410072105.1 filed on Jan. 17, 2024, the entire content of which is incorporated herein by reference.

TECHNICAL FIELD

The present application relates to the home field, and in particular, to a chair.

BACKGROUND

With the development of the home furnishing industry, people have more and more functional requirements for chairs. Currently existing chairs all have the two usage states: sitting and lying positions, thereby enriching chair usage needs and enhancing user experiences.

SUMMARY

The present disclosure provides a chair, including: a base; a seat frame, rotatably mounted on the base, a footrest bracket and a backrest bracket are articulated with the seat frame, and the footrest bracket and the backrest bracket are staggered from a rotation axis of the seat frame relative to the base; a rod-linkage structure, including a first rod-linkage assembly connected between the base and the seat frame, and a second rod-linkage assembly connected between the seat frame and the footrest bracket; and a driving unit, configured to drive the first rod-linkage assembly and the second rod-linkage assembly to operate to link rotation of the seat frame and rotation of the footrest bracket.

By adopting the above technical solution, when mounting and placing the chair, the base is placed on the ground, and the seat frame is rotated in a front-to-back direction relative to the base, and the footrest bracket and the backrest bracket are staggered from the rotation axis of the seat frame, the seat frame can be rotated and tilted to move the footrest bracket away from the ground, so as to avoid interference collision between the footrest bracket and the ground when the footrest bracket is extended, thereby lowering the mounting height requirement for the seat frame, and achieving the mounting requirement of “low seat height” for the seat frame, and improving user experience in terms of the use comfort in the sitting position state. In addition, the rod-linkage structure is used as a power transmission structure, which reduces the occupied space of the transmission structure, allows the transmission structure to be slimmer, improves aesthetics, and meanwhile applies the mounting manner of “low seat height” for the seat frame, i.e., the rod-linkage structure will not interfere with the ground during operation.

In some embodiments, an operating range of the rod-linkage structure is within a thickness range of the seat frame.

By adopting the above technical solution, the rod-linkage structure will not exceed the thickness range of the seat frame during operation, which can hide the rod-linkage structure and improve the user experience from the perspective of aesthetics.

In some embodiments, the driving unit is mounted on a side beam of the seat frame.

By adopting the above technical solution, the driving unit is side mounted to reduce the space occupied under the seat frame and to reduce interference with the rotation of the footrest.

In some embodiments, the first rod-linkage assembly includes a first connecting member and a second connecting member, and the first connecting member and the second connecting member are both articulated between the seat frame and the base, such that the base, the first connecting member, the seat frame, and the second connecting member form a four-bar mechanism.

In some embodiments, the first connecting member includes a rotating shaft, and a toothed plate and a rotating rod fixed on the rotating shaft; the rotating shaft is rotatably connected with two side beams of the seat frame; the toothed plate meshes with an output end of the driving unit; and the rotating rod is articulated with a side edge of the base.

In some embodiments, the toothed plate and a first rod member included in the second rod-linkage assembly are both provided with a position limiting slideway; a position limiter is fixed on the seat frame; and the position limiter is in sliding fit with the position limiting slideway, to limit rotation ranges of the toothed plate and the first rod member.

In some embodiments, the second rod-linkage assembly includes: a first rod member, a second rod member, a third rod member, and a fourth rod member; the first rod member and the third rod member are both articulated with the seat frame; the second rod member is articulated between the first rod member and the third rod member, and the seat frame, the first rod member, the second rod member, and the third rod member form a four-bar mechanism; and the fourth rod member is articulated between the third rod member and the footrest bracket, and the seat frame, the third rod member, the fourth rod member, and the footrest bracket form a four-bar mechanism.

In some embodiments, the second rod-linkage assembly includes: a first rod member, a second rod member, a third rod member, and a speed adjusting structure for adjusting a rotation speed of the footrest bracket; the first rod member, the second rod member, and the third rod member are sequentially articulated, the first rod member is articulated with the seat frame, and the third rod member is articulated with the footrest bracket; the speed adjusting structure includes: a connecting slideway on the seat frame, and a second sliding member slidably mounted on the connecting slideway, where, the second sliding member is articulated at a articulated connection between the second rod member and the third rod member, such that the seat frame, the first rod member, the second rod member, and the second sliding member form a rod-linkage slider structure; and the seat frame, the second sliding member, the third rod member, and the footrest bracket form a slider rod-linkage structure, where the connecting slideway is divided into two segments, with a same output power from the driving unit, during sliding processes of the second sliding member along the two segments of the connecting slideway respectively, a rotation speed of the footrest bracket is different.

In some embodiments, a first linkage member is connected between the first rod-linkage assembly and the second rod-linkage assembly. By adopting the above technical solution, the first linkage member connects the first rod-linkage assembly and the second rod-linkage assembly, and links the rotation of the seat frame and the rotation of the footrest bracket, improving the operation linkage.

In some embodiments, the seat frame and the footrest bracket are linked through the first linkage member; and one end of the first linkage member is articulated with one of a first connecting member and a second connecting member included in the first rod-linkage assembly, and the other end of the first linkage member is articulated with one of a first rod member, a second rod member, a third rod member, and a fourth rod member included in the second rod-linkage assembly.

In some embodiments, the driving unit includes: a first driving unit for driving the first rod-linkage assembly to operate, and a second driving unit for driving the second rod-linkage assembly to operate.

By adopting the above technical solution, the first rod-linkage assembly and the second rod-linkage assembly are independently driven by two different driving units to meet more driving operation requirements and mounting requirements of the driving units, while through the sequential coordination of the two driving units, the seat frame rotation action and the footrest bracket rotation action are coordinated.

In some embodiments, a second linkage member is connected between the backrest bracket and the rod-linkage structure, to link rotation of the backrest bracket and rotation of the seat frame and/or rotation of the footrest bracket.

By adopting the above technical solution, the backrest bracket and the rod-linkage structure are connected through the second linkage member to improve the linkage between the backrest bracket and the seat frame, the footrest bracket, thereby improving the linkage of the entire chair operation.

In some embodiments, the driving unit further includes a third driving unit for driving rotation of the backrest bracket.

By adopting the above technical solution, the backrest bracket may also be driven to rotate by an independent driving unit to meet different usage requirements of users.

In some embodiments, the footrest bracket includes a footrest body articulated with the seat frame and an extension plate slidably mounted on the footrest body, and an extension structure is connected to the seat frame, the extension plate and the footrest body, and the extension plate can slide relative to the footrest body during rotation of the footrest body relative to the seat frame.

By adopting the above technical solution, during the rotation of the footrest bracket, the extension plate can slide relative to the footrest body to change a support area provided by the footrest bracket to the user feet, thereby providing better support for the user feet, improving the user experience, and reducing the space occupied by the footrest bracket in the contraction state.

In some embodiments, the extension structure includes a fifth rod member and a first sliding member; one end of the fifth rod member is articulated with the seat frame, and the other end of the fifth rod member is articulated with the first sliding member; the first sliding member is in sliding fit connection with the footrest body and is connected to the extension plate; and the seat frame, the footrest body, the fifth rod member, and the first sliding member form a rod-linkage slider structure, and by rotating the footrest body around the seat frame to achieve sliding of the first sliding member relative to the footrest body, the extension plate is thus driven to slide relative to the footrest body.

In some embodiments, a sixth rod member and a seventh rod member are mounted on the footrest body; one end of the sixth rod member is articulated with the footrest body, and the other end of the sixth rod member is articulated with the seventh rod member; one end of the seventh rod member is articulated with the sixth rod member, and the other end of the seventh rod member is articulated with the extension plate; and the footrest body, the sixth rod member, the seventh rod member, and the extension plate form a rod-linkage slider structure, a bypass slideway is provided on the sixth rod member, and the first sliding member is in the avoidance slideway.

In some embodiments, the footrest body has a contraction state, an extension state, and an intermediate state between the contraction state and the extension state during a rotation process; and during a rotation switching process between the contraction state and the intermediate state of the footrest body, the extension plate is stationary relative to the footrest body, and during a rotation switching process between the intermediate state and the extension state of the footrest body, the extension plate slides relative to the footrest body.

By adopting the above technical solution, since the rotation angle of the seat frame is small in the early stage of the rotation adjustment of the footrest bracket, the distance between the footrest bracket and the ground is relatively small at this time, when the footrest body rotates from the contraction state to the intermediate state, the extension plate is stationary relative to the footrest body and does not slide or extend, thereby reducing the probability of the extension plate sliding out relative to the footrest body and occurring interference collision with the ground. If the extension plate collides with the ground, it will not only damage the footrest bracket, but also reduce the user experience. In the later stage of the rotation adjustment of the footrest bracket, i.e., when the footrest body rotates from the intermediate state to the extension state, the seat frame has been rotated to a certain angle, at which time the distance between the footrest bracket and the ground is relatively large, when the extension plate slides and extends relative to the footrest body, the probability of occurring interference collision between the extension plate and the ground is small.

In some embodiments, the footrest bracket has a contraction state, an extension state, and a speed change state between the contraction state and the extension state during a rotation process, and a speed adjusting structure for adjusting a rotation speed of the footrest bracket is connected between the footrest bracket and the rod-linkage structure.

By adopting the above technical solution, the rotation speed of the footrest bracket is adjusted to meet more usage requirements of users. In some embodiments, a rotation speed of the footrest bracket during a rotation switching process between the contraction state and the speed change state is n1; a rotation speed of the footrest bracket during a rotation switching process between the speed change state and the extension state is n2; where n1>n2.

By adopting the above technical solution, the rotation speed of the footrest bracket is relatively high when switching between the contraction state and the speed change state, such that the footrest bracket can be quickly extended (unfolded), and during this process, the footrest bracket has not supported the user feet, avoiding collision between the footrest bracket and the user feet; and the rotation speed of the footrest bracket is relatively slow when switching between the speed change state and the extension state, and the extension (unfolding) speed of the footrest bracket is slow, and during this process, the footrest bracket has supported the user feet and rotates at a slower speed, to improve the support comfort for the user legs, enhancing the user experience.

In some embodiments, the seat frame has a recessed portion on a side for sitting to increase sitting activity space.

In some embodiments, a flanging is provided on the seat frame, and/or a flanging is provided on the footrest bracket, and/or a flanging is provided on the backrest bracket.

By adopting the above technical solution, the flanging is provided to facilitate the buckling and disassembly of the surface cover and to enhance the strength of the components. In addition, the flanging may be bent directly on the component to make the flanging in an arc shape to reduce the appearance of corners and improve safety.

In some embodiments, the chair further includes a power supply for power supply, and the power supply is provided in the base.

By adopting the above technical solution, the power supply is provided (built) in the base to reduce space occupancy.

In some embodiments, an armrest mounting bracket for mounting an armrest is fixedly provided on the seat frame.

By adopting the above technical solution, an armrest mounting bracket is fixed on the seat frame, such that an armrest can also rotate with the seat frame, and when the chair switches between sitting position and lying position, the user can always hold the armrest to ensure safety.

In summary, the present disclosure includes at least one of the following beneficial technical effects.

In the present disclosure, during the operation of the seat frame and the footrest bracket, the seat frame will have an upwarp action, which can move the footrest bracket away from the ground and facilitate the rotation of the footrest bracket to meet the mounting requirements of “low seat height” for the seat frame, improving the use comfort.

In the present disclosure, the rod-linkage structure is used as a transmission structure, which enables the transmission structure to be thinner and reduces the space occupancy, and an operating range of the rod-linkage structure is within a thickness range of the seat frame, which can hide the rod-linkage structure and improve aesthetics.

In the present disclosure, during the rotation and unfolding process of the footrest bracket, the rotation speed is high in the early stage and low in the later stage, which improves the unfolding efficiency of the footrest bracket and reduces the impact effect of the footrest on the user feet when supporting the feet, improving the user experience; in addition, during the rotation and unfolding process of the footrest bracket, in the early stage the extension plate is stationary relative to the footrest body, and in the later stage the extension plate slides relative to the footrest body, which may reduce the probability of interference collision between the extension plate and the ground.

In the present disclosure, the quantity of the driving units is set in cooperation with the linkage form of the rod-linkage structure, to meet more use requirements of the user.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a simplified diagram of a chair operation structure according to Embodiment 1.

FIG. 2 is a simplified diagram of a chair operation structure of a linkage of a backrest bracket and a seat frame in Embodiment 2.

FIG. 3 is a simplified diagram of a chair operation structure of a linkage of a backrest bracket and a footrest bracket in Embodiment 2.

FIG. 4 is a simplified diagram of a chair operation structure according to Embodiment 3 and Embodiment 4.

FIG. 5 is a simplified diagram of a chair operation structure according to Embodiment 5.

FIG. 6 is a simplified diagram of a chair operation structure according to Embodiment 6.

FIG. 7 is a chair three-dimensional structure diagram according to Embodiment 6.

FIG. 8 is a top view of FIG. 7.

FIG. 9 is an enlarged diagram of A in FIG. 8.

FIG. 10 is a three-dimensional structure diagram of FIG. 7 in an unfolded state.

FIG. 11 is an enlarged diagram of B in FIG. 10.

FIG. 12 is an enlarged diagram of C in FIG. 10.

FIG. 13 is an enlarged diagram of D in FIG. 10.

FIG. 14 is a side cross-sectional view after omitting the base, where a footrest bracket is illustrated as disconnected.

FIG. 15 is an enlarged diagram of E in FIG. 14.

FIG. 16 is a side view of a sitting state when a footrest bracket is in an intermediate state.

Description of the reference numerals: 1, base; 11, leg; 12, connecting portion; 13, side edge; 2, seat frame; 21, recessed portion; 22, side beam; 23, cross beam; 24, support shaft; 25, support rod; 26, armrest mounting bracket; 3, footrest bracket; 31, footrest body; 311, sliding bar; 32, extension plate; 321, guide slideway; 33, extension structure; 331, fifth rod member; 332, first sliding member; 333, sixth rod member; 334, seventh rod member; 335, bypass slideway; 34, speed adjusting structure; 341, second sliding member; 342, connecting slideway; 4, backrest bracket; 41, second linkage member; 5, rod-linkage structure; 51, first rod-linkage assembly; 511, first connecting member; 5111, rotating shaft; 5113, toothed plate; 5114, rotating rod; 512, second connecting member; 52, second rod-linkage assembly; 521, first rod member; 522, second rod member; 523, third rod member; 524, fourth rod member; 53, first linkage member; 6, driving unit; 7, position limiting structure; 71, position limiting slideway; 72, position limiter; 73, blocking edge; 8, flanging; 9, power supply.

DETAILED DESCRIPTION

To make the object, technical solution and advantages of the present disclosure clearer, the present disclosure will be described below in detail in combination with accompanying drawings. In general, the components described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. All other embodiments obtained by those skilled in the art without creative effort based on the embodiments of the present disclosure fall within the scope of the present disclosure.

It should be noted that, similar reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it is not necessary to further define and explain in the subsequent figures.

In the description of the present disclosure, it should be noted that, unless otherwise specified and limited, terms such as “mounting”, “connected”, and “connecting” should be broadly understood, e.g., which may indicate: fixed connections, detachable connections, or integral connections; mechanical connections, or electrical connections; direct connections, indirect connections through intermediate media, or internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the present disclosure may be understood according to specific circumstances herein.

In the description of the present disclosure, it should be noted that, the orientations or positional relationships indicated by the terms “up”, “down”, “left”, “right”, etc., are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for convenience and simplification of the present disclosure, and do not indicate or imply that the device or element referred to must have a particular orientation, or be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

In current chair main body designs, to accommodate transitions between sitting position and lying position, one or more driving sources are provided to drive the chair main body, and to adjust the rotation of the seat frame, and the angles of the backrest and footrest through a multi-stage transmission structure. However, the multi-stage transmission structure occupies a large space during operation, especially a space below the seat frame, making the chair appear bulky, aesthetically unpleasing, and providing a relatively poor user experience.

Additionally, for the chair, the mounting (installation) position has to reach a certain height to prevent the footrest from colliding with the ground during rotation and unfolding, and the high-position installation of the seat frame also affects the use comfort, resulting in a relatively poor user experience.

The present disclosure will be further described in detail below with reference to FIGS. 1-16.

The present disclosure discloses a chair, being capable of switching between a sitting position and a lying position, and the following embodiments are described below.

Embodiment 1

As illustrated in FIG. 1 to FIG. 7, the chair includes a base 1, a seat frame 2, a footrest bracket 3, and a backrest bracket 4. The seat frame 2 is rotatably mounted on the base 1, and both the footrest bracket 3 and the backrest bracket 4 are articulated with the seat frame 2, where the backrest bracket 4 and the footrest bracket 3 are arranged staggered from a rotation axis of the seat frame 2, such that when the seat frame 2 rotates from a sitting position to a lying position, the footrest bracket 3 and the backrest bracket 4 revolve around the rotation axis of the seat frame 2, and undergo obvious position movement. Specifically, when the chair is actually mounted and used, the base 1 is placed on the ground, and when the seat frame 2 rotates around the base 1 (i.e., rotation of the seat frame 2 from a sitting position to a lying position on the base 1), the rotation axis of the seat frame 2 is along a horizontal direction (e.g., parallel to the ground). At this time, the rotation direction of the seat frame 2 relative to the base 1 is a front-back direction, and the footrest bracket 3 and the backrest bracket 4 will shift in a vertical direction, so as to change a distance between the footrest bracket 3 and the ground.

Additionally, the chair is further provided with a rod-linkage structure 5 and a driving unit 6, where, the rod-linkage structure 5 includes a first rod-linkage assembly 51 and a second rod-linkage assembly 52. The first rod-linkage assembly 51 is connected between the base 1 and the seat frame 2, and the second rod-linkage assembly 52 is connected between the seat frame 2 and the footrest bracket 3. The driving unit 6 is configured to drive the first rod-linkage assembly 51 and the second rod-linkage assembly 52 to operate to link the rotation of the seat frame 2 and the rotation of the footrest bracket 3.

In this embodiment, as illustrated in FIG. 7, the seat frame 2 includes two side beams 22 and two cross beams 23, the overall shape of the seat frame 2 is rectangular frame and the middle of the seat frame 2 is hollow out, to provide sufficient space for the user to sit. Each of the two side beams 22 has a recessed portion 21, the recessed portion 21 may have an inclined surface, an arc surface, etc., so as to increase the sitting space of the user, thereby providing an enclosed sitting feeling, and improving the user experience. During the manufacturing stage, a flanging 8 may be provided on the seat frame 2 and/or the footrest bracket 3 and/or the backrest bracket 4, or added later, which is easy to snap a bar of a surface cover, such surface cover mounting method is convenient and fast with low mounting costs. The footrest bracket 3 and the backrest bracket 4 are respectively articulated with the two side beams 22 of the seat frame 2, with the footrest bracket 3 articulated at a front edge of the seat frame 2 and the backrest bracket 4 articulated at a rear edge of the seat frame 2. In addition, an armrest mounting bracket 26 is fixedly mounted on the seat frame 2, which is easy for armrest (not illustrated) mounting.

In a sitting position, the footrest bracket 3 may be accommodated within the middle accommodation space of the seat frame 2, thereby enhancing the accommodating and hiding effect. During the switching from a sitting position to a lying position, the footrest bracket 3 rotates out from under the seat frame 2 and rotates to the front side of the seat frame 2, so as to support the user legs. In this embodiment, the seat frame 2 may rotate back and forth relative to the base 1. When the chair is placed on the ground, the front end of the seat frame 2 performs an upwarp action through backward rotation (e.g., by pressing down on the rear side of the seat frame 2) of the seat frame 2, raising the overall position of the footrest bracket 3, and increasing a distance between the footrest bracket 3 and the base 1 and a distance between the footrest bracket 3 and the ground, which reduces the occurrence of interference collision between the footrest bracket 3 and the base 1 and interference collision between the footrest bracket 3 and the ground during the rotation process of the footrest bracket 3, thereby meeting the mounting requirements of “low seat height” for the seat frame 2, i.e., the lowest point of the seat frame 2 is lower than the length of the footrest bracket 3. It should be noted that, in the “low seat height” state, the user knees can bend fully when sitting on the chair, and the sitting position is comfortable, in other words, the “low seat height” may refer to a situation where the length of the footrest bracket 3 remains unchanged, but the distance between the footrest bracket 3 and the ground increases as the footrest bracket 3 is unfolded (extended), allowing for an appropriate reduction in seat height (and the rotation (revolution) center of the footrest bracket 3 is also lowered).

The rod-linkage structure 5 and the driving unit 6 may link the rotation of the seat frame 2 and the rotation of the footrest bracket 3, enhancing the linkage of the structural operation. With the reasonable design of size, as well as the rotation speed of the seat frame 2 and the footrest bracket 3, collisions between the footrest bracket 3 and the base 1 as well as the ground can be avoided. In the sitting position, the footrest bracket 3 is retracted inside the seat frame 2, and the seat frame 2 and the footrest bracket 3 maintain an essentially horizontal state. As the seat frame 2 rotates backward, the front end of the seat frame 2 goes upwarp, raising the height of the footrest bracket 3 from the ground. Meanwhile, the footrest bracket 3 rotates under the linkage of the rod-linkage structure 5. Throughout the entire rotation process, the lowest point of the footrest bracket 3 remains above the ground to prevent collisions. The sizes and rotation speeds of the seat frame 2 and the footrest bracket 3 may also be reasonably designed to avoid collisions between the footrest bracket 3 and the base 1.

There are two rod-linkage structures 5 respectively located at an inner side of the two side beams 22. The rod-linkage structures 5 can enhance the stability and reliability of the linkage structure, and the side beams 22 also serve to hide the rod-linkage structures 5, improving the aesthetics of the chair. Specifically, during operation of the rod-linkage structure 5, an operating range of the rod-linkage structure 5 is within the thickness range of the seat frame 2, and occupies minimal space, which can meet the “low seat height” mounting requirements of the seat frame 2 and prevent the rod-linkage structure 5 from occurring collisions with the ground.

In this embodiment, since the rod-linkage structure 5 is located at an inner side of the side beam 22, and the footrest bracket 3 is accommodated under the seat frame 2 in the sitting position, the driving unit 6 is mounted on the side beam 22 of the seat frame 2, so as to free up space under the seat frame 2, and the driving unit 6 uses a rotating motor to provide power, which occupies less space compared to a push rod motor, which may meet the requirements of “low seat height” and “slimmer chair”. The power supply 9 is provided in the base 1, and may be fixed with straps, ropes, or wires, making it convenient for the power supply 9 to be mounted and removed without separately occupying space.

As illustrated in FIG. 1, the first rod-linkage assembly 51 includes a first connecting member 511 and a second connecting member 512. Both the first connecting member 511 and the second connecting member 512 are articulated between the seat frame 2 and the base 1, such that the base 1, the first connecting member 511, the seat frame 2, and the second connecting member 512 form a four-bar mechanism. The driving unit 6 is configured to drive the first connecting member 511 or the second connecting member 512 to rotate, so as to operate the first rod-linkage assembly 51. In this embodiment, the driving unit 6 drives the first connecting member 511 to rotate.

In this embodiment, as illustrated in FIG. 7, the base 1 is in the middle under the seat frame 2, and the seat frame 2 has a hollow frame structure. To facilitate connection and mounting, a support shaft 24 is fixedly connected between the two side beams 22 of the seat frame 2, and a support rod 25 is fixedly arranged on the support shaft 24, to help the articulating of the second connecting member 512. In addition, the support shaft 24 can also enhance the structural strength of the seat frame 2. As illustrated in FIG. 7, FIG. 8 and FIG. 11, the base 1 includes legs 11, a connection portion 12 fixed on the legs 11, and a side edge 13 fixed on the connection portion 12. The connection portion 12 facilitates mounting of the power supply 9, and the side edge 13 facilitates the articulating of the first connecting member 511 and the articulating of first second connecting member 512.

Specifically, one end of the first connecting member 511 is articulated with the main body of the seat frame 2, and the other end of the first connecting member 511 is articulated with the side edge 13 of the base 1. One end of the second connecting member 512 is articulated with the support rod 25, and the other end of the second connecting member 512 is articulated with the side edge 13 of the base 1.

The second rod-linkage assembly 52 includes a first rod member 521, a second rod member 522, a third rod member 523, and a fourth rod member 524, as illustrated in FIG. 1 to FIG. 5. Specifically, the first rod member 521 and the third rod member 523 are both articulated with the seat frame 2, second rod member 522 is articulated between first rod member 521 and the third rod member 523, where the seat frame 2, the first rod member 521, the second rod member 522, and the third rod member 523 form a four-bar mechanism; and the fourth rod member 524 is articulated between third rod member 523 and the footrest bracket 3, and where the seat frame 2, the third rod member 523, the fourth rod member 524, and the footrest bracket 3 form a four-bar mechanism.

Two groups of four-bar mechanism are connected to be used for long-distance transmission scenarios, and in order to enhance structural reliability, the rod members in the four-bar mechanism may be bent-designed or designed with flywheels to reduce stuck situations.

The driving unit 6 includes a first driving unit, a second driving unit, and a third driving unit (the three driving units are not illustrated). The first driving unit drives the first rod-linkage assembly 51 to operate, the second driving unit drives the second rod-linkage assembly 52 to operate, and the third driving unit drives the backrest bracket 4 to operate. Specifically, in this embodiment, the first driving unit drives the first connecting member 511 to rotate, and the second driving unit drives the first rod member 521 to rotate, while in other embodiments, the first driving unit may also drive the second connecting member 512, the second driving unit may drive the second rod member 522, the third rod member 523, and/or the fourth rod member 524, and the third driving unit may directly drive the backrest bracket 4 to rotate.

As illustrated in FIG. 10 and FIG. 13, the first connecting member 511 includes a rotating shaft 5111, a toothed plate 5113 and a rotating rod 5114 fixed on the rotating shaft 5111, and the rotating shaft 5111 is rotatably connected to the two side beams 22, which is equivalent to that the first connecting member 511 is articulated with the seat frame 2; the toothed plate 5113 meshes with the output end of the driving unit 6, and the rotating rod 5114 is articulated with the side edge 13 of the base 1, which is equivalent to that the rotating rod 5114 is articulated with the base 1; and the first rod member 521 is machined with teeth to facilitate engagement with the output end of the second driving unit. Three driving units 6 work in cooperation to achieve the linkage of the rotation of the seat frame 2, rotation of the footrest bracket 3, and rotation of the backrest bracket 4, enhancing the linkage of the chair.

In addition, as illustrated in FIG. 13 and FIG. 14, a position limiting structure 7 is provided on the seat frame 2 to limit an operating range of the chair. Specifically, in this embodiment, the toothed plate 5113 of the first connecting member 511 in the first rod-linkage assembly 51 and the first rod member 521 of the second rod-linkage assembly 52 both have a position limiting slideway 71, a position limiter 72 is fixed on the seat frame 2, and the position limiter 72 is in sliding fit with the position limiting slideway 71 to limit rotation ranges of the toothed plate 5113 and the first rod member 521. Further, as illustrated in FIG. 11, the side edge 13 of the base I has a blocking edge 73, which can block the first connecting member 511 and the second connecting member 512, and play a position limiting role, thereby restricting the rotation range of the seat frame 2. The cross beam 23 in the seat frame 2 also directly restricts rotation range of the footrest bracket 3.

As illustrated in FIG. 8 to FIG. 12, the footrest bracket 3 includes a footrest body 31 and an extension plate 32. The footrest body 31 is articulated with the seat frame 2, the extension plate 32 is slidably connected to the footrest body 31. The footrest body 31 is provided with a sliding bar 311, and the extension plate 32 is provided with a guide slideway 321, and through the sliding fit of the sliding bar 311 with the guide slideway 321, the sliding of the extension plate 32 is guided. An extension structure 33 is connected to the seat frame 2, the extension plate 32 and the footrest body 31. As illustrated in FIG. 9, by using the extension structure 33, the extension plate 32 can slide relative to the footrest body 31 during the rotation process of the footrest body 31 relative to the seat frame 2.

Moreover, during the rotation process of the footrest body 31, the footrest body 31 has a contraction state, an extension state, and an intermediate state between the contraction state and the extension state. During the rotation switching process between the contraction state and the intermediate state of the footrest body 31, the extension plate 32 is stationary relative to the footrest body 31, and during the rotation switching process between the intermediate state and the extension state of the footrest body 31, the extension plate 32 slides out relative to the footrest body 31, i.e., in the early stage of the unfolding (extension) process of the footrest bracket 3, the extension plate 32 does not slide out relative to the footrest body 31 to avoid colliding with the ground, and in the later stage of the unfolding process of the footrest bracket 3, the extension plate 32 slides out relative to the footrest body 31.

In this embodiment, when the distance between the footrest bracket 3 and the ground is minimized, the footrest body 31 is in the intermediate state. As the footrest bracket 3 rotates from the contraction state to the intermediate state, the distance between the footrest bracket 3 and the ground gradually decreases, but while the footrest bracket 3 rotates from the intermediate state to the extension state, the distance between the footrest bracket 3 and the ground gradually increases. The extension plate 32 begins to slide only after the intermediate state, thereby effectively reducing the probability of the extension plate 32 colliding with the ground.

As illustrated in FIG. 9, the extension structure 33 includes a fifth rod member 331 and a first sliding member 332; where one end of the fifth rod member 331 is articulated with the seat frame 2, and the other end of the fifth rod member 331 is articulated with the first sliding member 332; the first sliding member 332 is in sliding fit connection with the footrest body 31 and is connected to the extension plate 32; and the seat frame 2, the footrest body 31, the fifth rod member 331, and the first sliding member 332 form a rod-linkage slider structure, and by rotating the footrest body 31 around the seat frame 2 to achieve sliding of the first sliding member 332 relative to the footrest body 31, the extension plate 32 is thus driven to slide relative to the footrest body 31.

In addition, a sixth rod member 333 and a seventh rod member 334 are mounted on the footrest body 31 for connecting the first sliding member 332 of the extension structure 33 with the extension plate 32, where one end of the sixth rod member 333 is articulated with the footrest body 31, and the other end of the sixth rod member 333 is articulated with the seventh rod member 334; one end of the seventh rod member 334 is articulated with the sixth rod member 333, and the other end of the seventh rod member 334 is articulated with the extension plate 32; and the footrest body 31, the sixth rod member 333, the seventh rod member 334, and the extension plate 32 form a rod-linkage slider structure, a bypass slideway 335 is provided on the sixth rod member 333, and the first sliding member 332 is in the bypass slideway 335.

During the rotation and unfolding of the footrest bracket 3 from the contraction state to the intermediate state, the first sliding member 332 slides relative to the footrest body 31 and meanwhile slides relative to the sixth rod member 333 along the bypass slideway 335. At this time, the first sliding member 332 does not push the sixth member 333 to rotate, the early rotation stage of the footrest bracket 3 is achieved, i.e., the footrest body 31 rotates while the extension plate 32 does not slide and extend; when the footrest bracket 3 rotates to the intermediate state, the first sliding member 332 slides to the end of the bypass slideway 335, and the footrest body 31 continues to rotate and causes the first sliding member 332 to slide, and thus pushing the sixth rod member 333 to rotate, so as to push and extend out the extension plate 32, and thus the later rotation stage of the footrest bracket 3 is achieved, i.e., the footrest body 31 rotates and the extension plate 32 slides and extends out.

Embodiment 2

The difference from Embodiment 1 is that, the driving unit 6 includes a first driving unit and a second driving unit, the chair further includes a second linkage member 41 connected between the backrest bracket 4 and the rod-linkage structure 5, to link the rotation of the backrest bracket 4 and the rotation of the seat frame 2, or to link the rotation of the backrest bracket 4 and the rotation of the footrest bracket 3, e.g., as illustrated in FIG. 13 and FIG. 14. One end of the second linkage member 41 is articulated with the backrest bracket 4, and the other end of the second linkage member 41 is articulated with the first connecting member 511, so as to link the backrest bracket 4 and the seat frame 2. The seat frame 2, the first connecting member 511, the second linkage member 41, and the backrest bracket 4 form a four-bar mechanism; or one end of the second linkage member 41 is articulated with the backrest bracket 4, and the other end of the second linkage member 41 is articulated with any one of four rod members in the second rod-linkage assembly 52, so as to link the backrest bracket 4 and the footrest bracket.

Embodiment 3

The difference from Embodiment 1 is that, the driving unit 6 includes a first driving unit and a third driving unit, the chair further includes a first linkage member 53 connected between the first rod-linkage assembly 51 and the second rod-linkage assembly 52, to link the seat frame 2 and the footrest bracket 3 through the first linkage member 53, as illustrated in FIG. 14. In this embodiment, one end of the first linkage member 53 is articulated with the first connecting member 511 in the first rod-linkage assembly 51, and the other end of the first linkage member 53 is articulated with the first rod member 521 in the second rod-linkage assembly 52. In other embodiments, the first linkage member 53 may also be articulated between the first connecting member 511 and other rod members in the second rod-linkage assembly 52; or, the first linkage member 53 may be articulated between the second connecting member 512 in the first rod-linkage assembly 51 and the rod members in the second rod-linkage assembly 52, to achieve the linkage operation of the seat frame 2 and the footrest bracket 3. In other words, one end of the first linkage member 53 is articulated with one of the first connecting member 511 and the second connecting member 512 included in the first rod-linkage assembly 51, and the other end of the first linkage member 53 is articulated with one of the first rod member 521, the second rod member 522, the third rod member 523, and the fourth rod member 524 included in the second rod-linkage assembly 52.

In this embodiment, the first driving unit directly drives the operation of the first rod-linkage assembly 51, and then the operations of the second rod-linkage assembly 52 and the footrest bracket 3 are linked through the first linkage member 53. The backrest bracket 4 is independently driven by the third driving unit to operate.

Embodiment 4

The difference from Embodiment 3 is that, the driving unit 6 includes a second driving unit and a third driving unit but does not include a first driving unit. The second driving unit drives the second rod-linkage assembly 52 to operate, and then, the first linkage member 53 links the first rod-linkage assembly 51 and the seat frame 2 to operate. The backrest bracket 4 is independently driven by the third driving unit.

Embodiment 5

The difference from Embodiment 1 is that, a second linkage member 41 is connected between the backrest bracket 4 and the rod-linkage structure 5, and a first linkage member 53 is connected between the first rod-linkage assembly 51 and the second rod-linkage assembly 52, as illustrated in FIG. 14. Any one of the three driving units 6 may be used, and thus the triple linkage of the seat frame 2, the backrest bracket 4, and the footrest bracket 3 is achieved.

Embodiment 6

This embodiment provides a new embodiment of the second rod-linkage assembly 52, and the arrangement of the driving unit 6, as well as the linkage relationship between the seat frame 2, the backrest bracket 4, and the footrest bracket 3 may choose any one from Embodiment 1 to Embodiment 5.

Specifically, as illustrated in FIG. 6 and FIG. 15, the second rod-linkage assembly 52 includes a first rod member 521, a second rod member 522, a third member 523, and a speed adjusting structure 34 for adjusting the rotation speed of the footrest bracket 3. In this embodiment, the first rod member 521, the second rod member 522, and the third rod member 523 are articulated in sequence, with the first rod member 521 articulated with the seat frame 2 and the third rod member 523 articulated with the footrest bracket 3. The speed adjusting structure 34 includes a connecting slideway 342 provided on the seat frame 2 and a second sliding member 341 slidably mounted on the connecting slideway 342. The second sliding member 341 is articulated at an articulated connection position between the second rod member 522 and the third rod member 523, such that the seat frame 2, the first rod member 521, the second rod member 522, and the second sliding member 341 form a rod-linkage slider structure; the seat frame 2, the second sliding member 341, the third rod member 523, and the footrest bracket 3 form a slider rod-linkage structure, where the connecting slideway 342 is divided into two segments. With the same output power from the driving unit 6, during the sliding processes of the second sliding member 341 along the two segments of the connecting slideway 342 respectively, the respective rotation speeds of the footrest bracket 3 are different.

Specifically, the footrest bracket 3 further has a speed change state between the contraction state and the extension state. The rotation speed of the footrest bracket 3 during a rotation switching process between the contraction state and the speed change state is n1; the rotation speed of the footrest bracket 3 during a rotation switching process between the speed change state and the extension state is n2; where, n1>n2. That is, the footrest bracket 3 has a higher rotation speed in the early stage of the unfolding process, which can achieve rapid unfolding and ensure operational efficiency, and in the later stage of the unfolding process, the rotation speed is lower. At this time, the footrest bracket 3 is used to contact with, support, and lift the user legs, avoiding too high a speed when the footrest bracket 3 comes into contact with the user legs, causing impact on the user legs and affecting the user experience.

It should be noted that, the rotation speed mentioned above do not refer to a uniform rotation speed of the footrest bracket 3 between the two states, but an instantaneous rotation speed of the footrest bracket 3 at any moment between the two states, i.e., the instantaneous rotation speed of the footrest bracket 3 at any moment between the contraction state and the speed change state is greater than the instantaneous rotation speed at any moment between the speed change state and the extension state. In other words, a minimum rotation speed of the footrest bracket 3 between the contraction state and the speed change state is greater than a maximum rotation speed between the speed change state and the extension state.

In addition, the speed change state and the intermediate state are further explained as that, the state of footrest bracket 3 when rotating to a vertical state is the speed change state, and the intermediate state may appear after the vertical state, i.e., the intermediate state and the speed change state of the footrest bracket 3 may be two different states. In other embodiments, the intermediate state may also appear at the same time as the speed change state, or the intermediate state and the speed change state are the same.

All the above are some embodiments of the present disclosure and do not limit the scope of protection of the present application. Therefore, any equivalent variations made based on the structure, shape, and principle of this application should be covered within the scope of protection of the present application.

Claims

1. A chair, comprising: a base;a seat frame rotatably mounted on the base, wherein a footrest bracket and a backrest bracket are articulated with the seat frame, and the footrest bracket and the backrest bracket are respectively staggered from a rotation axis of the seat frame relative to the base;a rod-linkage structure, comprising a first rod-linkage assembly connected between the base and the seat frame, and a second rod-linkage assembly connected between the seat frame and the footrest bracket; anda driving unit, configured to drive the first rod-linkage assembly and the second rod-linkage assembly to operate, to link rotation of the seat frame and rotation of the footrest bracket.

2. The chair according to claim 1, wherein an operating range of the rod-linkage structure is within a thickness range of the seat frame.

3. The chair according to claim 1, wherein the driving unit is mounted on a side beam of the seat frame.

4. The chair according to claim 1, wherein the first rod-linkage assembly comprises a first connecting member and a second connecting member, the first connecting member and the second connecting member are both articulated between the seat frame and the base, such that the base, the first connecting member, the seat frame, and the second connecting member form a four-bar mechanism.

5. The chair according to claim 4, wherein the first connecting member comprises a rotating shaft, and a toothed plate and a rotating rod fixed on the rotating shaft; the rotating shaft is rotatably connected to two side beams of the seat frame;the toothed plate meshes with an output end of the driving unit; andthe rotating rod is articulated with a side edge of the base.

6. The chair according to claim 5, wherein the toothed plate and a first rod member comprised in the second rod-linkage assembly are both provided with a position limiting slideway; a position limiter is fixed on the seat frame; andthe position limiter is in sliding fit with the position limiting slideway, to limit rotation ranges of the toothed plate and the first rod member.

7. The chair according to claim 1, wherein the second rod-linkage assembly comprises: a first rod member, a second rod member, a third rod member, and a fourth rod member; the first rod member and the third rod member are both articulated with the seat frame;the second rod member is articulated between the first rod member and the third rod member, and the seat frame, the first rod member, the second rod member, and the third rod member form a four-bar mechanism; andthe fourth rod member is articulated between the third rod member and the footrest bracket, and the seat frame, the third rod member, the fourth rod member, and the footrest bracket form a four-bar mechanism.

8. The chair according to claim 1, wherein the second rod-linkage assembly comprises: a first rod member, a second rod member, a third rod member, and a speed adjusting structure for adjusting a rotation speed of the footrest bracket; the first rod member, the second rod member, and the third rod member are sequentially articulated, the first rod member is articulated with the seat frame, and the third rod member is articulated with the footrest bracket;the speed adjusting structure comprises: a connecting slideway arranged on the seat frame, and a second sliding member slidably mounted on the connecting slideway, wherein, the second sliding member is articulated at an articulated connection position between the second rod member and the third rod member, such that the seat frame, the first rod member, the second rod member, and the second sliding member form a rod-linkage slider structure; andthe seat frame, the second sliding member, the third rod member, and the footrest bracket form a slider rod-linkage structure, wherein the connecting slideway is divided into two segments, with a same output power from the driving unit, during sliding processes of the second sliding member along the two segments of the connecting slideway respectively, respective rotation speeds of the footrest bracket are different.

9. The chair according to claim 1, wherein a first linkage member is connected between the first rod-linkage assembly and the second rod-linkage assembly.

10. The chair according to claim 9, wherein the seat frame and the footrest bracket are linked through the first linkage member; and one end of the first linkage member is articulated with one of a first connecting member and a second connecting member comprised in the first rod-linkage assembly, and the other end of the first linkage member is articulated with one of a first rod member, a second rod member, a third rod member, and a fourth rod member comprised in the second rod-linkage assembly.

11. The chair according to claim 1, wherein the driving unit comprises: a first driving unit for driving the first rod-linkage assembly to operate, and a second driving unit for driving the second rod-linkage assembly to operate.

12. The chair according to claim 1, wherein a second linkage member is connected between the backrest bracket and the rod-linkage structure, to link rotation of the backrest bracket and rotation of the seat frame and/or rotation of the footrest bracket.

13. The chair according to claim 1, wherein the driving unit further comprises a third driving unit for driving rotation of the backrest bracket.

14. The chair according to claim 1, wherein the footrest bracket comprises a footrest body articulated with the seat frame and an extension plate slidably mounted on the footrest body, and an extension structure is connected to the seat frame, the extension plate and the footrest body, and the extension plate is able to slide relative to the footrest body during rotation of the footrest body relative to the seat frame.

15. The chair according to claim 14, wherein the extension structure comprises a fifth rod member and a first sliding member; one end of the fifth rod member is articulated with the seat frame, and the other end of the fifth rod member is articulated with the first sliding member;the first sliding member is in sliding fit connection with the footrest body and is connected to the extension plate; andthe seat frame, the footrest body, the fifth rod member, and the first sliding member form a rod-linkage slider structure, and by rotating the footrest body around the seat frame to achieve sliding of the first sliding member relative to the footrest body, the extension plate is thus driven to slide relative to the footrest body.

16. The chair according to claim 15, wherein a sixth rod member and a seventh rod member (334) are mounted on the footrest body; one end of the sixth rod member is articulated with the footrest body, and the other end of the sixth rod member is articulated with the seventh rod member;one end of the seventh rod member is articulated with the sixth rod member, and the other end of the seventh rod member is articulated with the extension plate; andthe footrest body, the sixth rod member, the seventh rod member, and the extension plate form a rod-linkage slider structure, a bypass slideway is provided on the sixth rod member, and the first sliding member is in the bypass slideway.

17. The chair according to claim 14, wherein the footrest body has a contraction state, an extension state, and an intermediate state between the contraction state and the extension state during a rotation process; and during a rotation switching process between the contraction state and the intermediate state of the footrest body, the extension plate is stationary relative to the footrest body, and during a rotation switching process between the intermediate state and the extension state of the footrest body, the extension plate slides relative to the footrest body.

18. The chair according to claim 1, wherein the footrest bracket has a contraction state, an extension state, and a speed change state between the contraction state and the extension state during a rotation process, and a speed adjusting structure for adjusting a rotation speed of the footrest bracket is connected between the footrest bracket and the rod-linkage structure.

19. The chair according to claim 18, wherein a rotation speed of the footrest bracket during a rotation switching process between the contraction state and the speed change state is n1; a rotation speed of the footrest bracket during a rotation switching process between the speed change state and the extension state is n2; wherein, n1>n2.

20. The chair according to claim 1, wherein the seat frame has a recessed portion on a side for sitting to increase sitting activity space; and/or a flanging is provided on the seat frame, and/or the footrest bracket, and/or the backrest bracket; and/orthe chair further comprises a power supply for power supply, and the power supply is provided in the base; and/oran armrest mounting bracket for mounting an armrest is fixedly provided on the seat frame.