Backrest supporting assembly and seat

Abstract

The utility model discloses a backrest supporting assembly which is used for a seat, and the backrest supporting assembly comprises a backrest support and a base connecting part, the backrest support comprises a backrest supporting part and a base connecting part, the backrest supporting part is used for supporting a backrest of the seat, and the base connecting part can be rotatably connected with a base of the seat; the limiting piece comprises a first part and a second part capable of stretching out and drawing back relative to the first part, one of the first part and the second part is used for connecting one of the backrest support and the base of the seat, and the other one of the first part and the second part is in sliding fit with the other one of the backrest support and the base of the seat; the reset piece is used for being arranged on a base of the seat, and the reset piece can apply acting force to the backrest support so that the backrest support can be reset. The backrest supporting assembly is used for the seat, and the convenience of adjusting the angle of the backrest when a user uses the seat is improved. In addition, the utility model further discloses a seat.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a backrest support assembly and a seat. Background Art

[0002] Chairs are commonly seen in offices, study rooms and other places, and they can meet people's needs of sitting for a long time to work, study or rest.

[0003] In the seats of related technology, the backrest is supported by a backrest bracket rotatably connected to the base and is equipped with an adjustment assembly. The clamping block in the adjustment assembly is fixed to the rotating shaft of the backrest bracket, and the limiting step block is connected to the base. The clamping block is abutted against different steps of the limiting step block to limit the reclining angle of the backrest bracket relative to the base.

[0004] If the user wants to adjust the angle and / or position of the backrest relative to the base, the user must first control the adjustment component to unlock to release the backrest bracket, so that the backrest bracket can drive the backrest to rotate, which is cumbersome to operate and inconvenient to use. Utility Model Content

[0005] The main purpose of the present invention is to provide a backrest support assembly, which is intended to improve the convenience for users to adjust the angle and / or position of the backrest relative to the base when using a chair.

[0006] To achieve the above-mentioned object, the present invention provides a backrest support assembly for a seat, wherein the backrest support assembly comprises:

[0007] A backrest bracket, comprising a backrest support portion and a base connection portion, wherein the backrest support portion is used to support the backrest of the seat, and the base connection portion can be rotatably connected to the base of the seat;

[0008] a limiting member comprising a first portion and a second portion that is retractable relative to the first portion, wherein one of the first portion and the second portion is used to connect the backrest bracket and the seat base, and the other of the first portion and the second portion is slidably engaged with the other of the backrest bracket and the seat base;

[0009] A reset member is provided on the base of the seat, and the reset member can apply a force to the backrest bracket to reset it.

[0010] In some embodiments, when the second portion is in sliding engagement with the backrest bracket, the backrest bracket is provided with a sliding groove that forms a sliding engagement with the second portion; or

[0011] When the second part is in sliding engagement with the base of the seat, the base of the seat is provided with a sliding groove that forms a sliding engagement with the second part.

[0012] In some embodiments, the second portion is configured with a sliding portion, which is disposed in the sliding groove and can slide along the sliding groove.

[0013] In some embodiments, the sliding portion is a sliding shaft, and the sliding shaft is accommodated in the sliding groove; or,

[0014] The sliding part is a pulley, and the pulley is accommodated in the sliding groove.

[0015] In some embodiments, the limiting member is a gas spring, the first part is a cylinder of the gas spring, and the second part is a piston rod of the gas spring.

[0016] In some embodiments, the piston rod of the gas spring is extended and retracted from one end of the cylinder body, the other end of the cylinder body is hinged to the base of the seat, and the extended end of the piston rod of the gas spring is slidably engaged with the backrest bracket; or,

[0017] The piston rod of the gas spring is extended and retracted from one end of the cylinder body, and the other end of the cylinder body is used to be hinged to the backrest bracket. The protruding end of the piston rod of the gas spring is slidably matched with the base of the seat.

[0018] In some embodiments, the protruding end of the piston rod of the gas spring is connected to a switch, and the switch is used to lock or unlock the piston rod of the gas spring.

[0019] In some embodiments, a rotating member is installed at one end of the base connecting portion away from the backrest supporting portion, and the base connecting portion is rotatably connected to the base of the seat through the rotating member.

[0020] In some embodiments, the rotating member includes a bracket connecting portion and a base hinge portion integrally formed with the bracket connecting portion, the bracket connecting portion is detachably connected to the backrest bracket, and the base hinge portion is used to be hinged to the base of the seat.

[0021] In some embodiments, the return member is a return spring, one end of the return spring acts on the base hinge portion, and the other end of the return spring can be connected to the base of the seat.

[0022] The present invention further provides a chair comprising a base, a backrest and the backrest support assembly as described above, wherein the backrest support portion supports the backrest, and the base connecting portion is rotatably connected to the base.

[0023] The backrest support assembly proposed in the present invention is used for a seat. When using the seat, the user can lean back to different angles by leaning against the backrest, and the limit position of the backrest bracket can be limited by a limiter to limit the limit of the backrest bracket's rotation, thereby limiting the limit of the backrest angle. In particular, because the first part or the second part of the limiter slides with the backrest bracket or the seat base, the backrest bracket is not completely locked. If the user wants to adjust the angle and / or position of the backrest relative to the base, they only need to stop applying a backward force to the backrest or reduce the backward force applied to the backrest. Under the force applied by the reset member to the backrest bracket, the backrest bracket will slide relative to the limiter connected to the base, or the limiter connected to the backrest bracket will slide relative to the base, thereby allowing the backrest bracket to directly drive the backrest to rotate, so that the backrest automatically adapts to the user's back position, without having to operate the limiter to unlock it. The operation is simple and convenient. In addition, the backrest can be adjusted in time, which helps to improve the convenience of adjusting the backrest angle when the user uses the seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of a backrest support assembly supporting a seat back and connected to a seat base in one embodiment of the present invention;

[0025] Figure 2 This is a schematic structural diagram of the connection between the backrest support assembly and the seat base in one embodiment of the present invention;

[0026] Figure 3 This is a structural diagram of a portion of a backrest support assembly in one embodiment of the present utility model;

[0027] Figure 4 This is a structural diagram of a position-limiting member of a backrest support assembly in one embodiment of the present utility model;

[0028] Figure 5 This is a structural diagram of another part of the backrest support assembly in one embodiment of the present utility model;

[0029] Figure 6 This is a structural diagram of another part of the backrest support assembly in one embodiment of the present utility model. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the schemes in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0033] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0034] As a seat for people to work, study or rest, the technology of chairs is developing in a more humane and intelligent direction, striving to provide users with a comfortable and healthy sitting experience.

[0035] Generally speaking, a seat mainly consists of a base, a seat cushion, a backrest and other structural components. The base (also known as the chassis) serves as the foundation of the entire seat structure, bearing the weight of the human body and various pressures that may be generated during use, and has sufficient strength and stability. In addition, the base is a key component that connects the seat body (such as the backrest, seat cushion, etc.). It combines various components together through specific connection methods (such as fixed connection, rotating connection, etc.) to form a complete seat structure. Among them, the seat cushion is provided on the base, and the backrest is provided above the seat cushion and located at the rear side of the seat cushion. When a person sits on the seat, he or she sits on the seat cushion, and the seat cushion provides support for the buttocks and thighs of the person. In addition, the back and / or waist can lean on the backrest, and the backrest provides support for the back and / or waist of the person.

[0036] The embodiment of the present invention provides a backrest support assembly, which is used as a support structure for supporting a backrest and is used for a seat. In the seat, the backrest can be connected to the backrest support assembly to achieve installation.

[0037] Reference Figure 1 and Figure 2 , the back support assembly 100 includes:

[0038] The backrest bracket 110 includes a backrest support portion 111 and a base connection portion 112. The backrest support portion 111 is used to support the backrest 200 of the seat, and the base connection portion 112 can be rotatably connected to the base 300 of the seat;

[0039] The limiting member 120 includes a first portion 121 and a second portion 122 that is retractable relative to the first portion 121 , wherein one of the first portion 121 and the second portion 122 is used to connect the backrest bracket 110 and the seat base 300 , and the other of the first portion 121 and the second portion 122 is slidably engaged with the other of the backrest bracket 110 and the seat base 300 ;

[0040] The restoring member 130 is provided on the seat base 300 . The restoring member 130 can apply a force to the backrest bracket 110 to restore the backrest bracket 110 .

[0041] The backrest bracket 110 can be disposed on the rear side of the base 300 and is used to cooperate with the backrest 200 to provide support for the back and / or waist of the human body. The backrest bracket 110 can adopt a variety of shapes, such as arc, S-shape, L-shape, etc., and can be set according to actual structural requirements. To ensure sufficient support strength, the backrest bracket 110 can be made of metal (such as steel, aluminum alloy, etc.), plastic, etc. The backrest bracket 110 is connected to the backrest 200 of the seat and provides support for the backrest 200. For example, with the front, back, left, and right directions of the seat as a reference direction, the backrest is located in the front direction of the backrest bracket 110 and is connected to the backrest bracket 110. The backrest bracket 110 mainly includes two parts: a backrest support portion 111 and a base connection portion 112. The backrest support portion 111 and the base connection portion 112 are arranged at an angle, which can be a right angle or an obtuse angle. In addition, the backrest support portion 111 and the base connection portion 112 can be integrally formed or detachably connected. The backrest bracket 110 supports the backrest 200 via its backrest support portion 111 and is rotatably connected to the seat base 300 via a base connection portion 112. The rotatable connection between the backrest bracket 110 and the base 300 can be achieved by extending the base connection portion 112 of the backrest bracket 110 through the base 300 via a hinge axis Jz, thereby achieving a rotatable connection with the base 300. This is, of course, exemplary only and not restrictive.

[0042] The limiter 120 is disposed between the backrest bracket 110 and the base 300, and is capable of limiting the rotational position of the backrest bracket 110, thereby achieving a limit angle for reclining. The limiter 120 is mainly composed of a first portion 121 and a second portion 122. The second portion 122 and the first portion 121 have a movable or fixed structural relationship. In other words, the limiter 120 has a locking function. In the locked state, the second portion 122 is fixed relative to the first portion 121. In the unlocked state, the second portion 122 can be extended relative to the first portion 121. Optionally, the first portion 121 and the second portion 122 are both roughly rod-shaped, with the first portion 121 being the first rod portion and the second portion 122 being the second rod portion. The second rod portion is coaxially arranged with the first rod portion, the second rod portion is partially located inside the first rod portion, and partially extends outside the first rod portion, and can be extended relative to the first rod portion. Among them, the structural type of the limiter 120 can be various, for example, the limiter 120 can be a gas spring, an electric push rod, etc.

[0043] The connection / cooperation relationship between the limiting member 120 and the backrest bracket 110 and the base 300 may include:

[0044] The first portion 121 of the limiting member 120 is connected to the backrest bracket 110, and the second portion 122 is slidably engaged with the base 300; or,

[0045] The second portion 122 of the limiting member 120 is connected to the backrest bracket 110, and the first portion 121 is slidably engaged with the base 300; or,

[0046] The first portion 121 of the limiting member 120 is connected to the base 300 , and the second portion 122 is slidably engaged with the backrest bracket 110 ; or,

[0047] The second portion 122 of the limiting member 120 is connected to the base 300 , and the first portion 121 is slidably engaged with the backrest bracket 110 .

[0048] In practical applications, any of the four connection / fitting relationships described above can be selected, and this embodiment does not impose any limitations thereon. The connections involved can include hinged connections, rotational connections, and the like. In this way, the stopper 120 can follow the rotation of the backrest bracket 110 and rotate within a certain range to avoid motion interference. A sliding fit, on the other hand, refers to a fitting relationship in which two parts slide relative to each other. The corresponding sliding fit structure can employ a slide groove, a slide rail, or the like. In this type of fit, one part can slide smoothly over another to achieve a specific function.

[0049] Optionally, the first portion 121 or the second portion 122 of the limiting member 120 is connected to or slidably engaged with the base connecting portion 112 to achieve connection or slidably engaged with the backrest bracket 110 .

[0050] The function of the reset member 130 is to provide a force for the backrest bracket 110 so that the backrest bracket 110 can be rotated and reset toward the initial position after rotation. For example, after the backrest bracket 110 rotates and reclines, when the external force applied thereto is canceled or reduced, the backrest bracket 110 can be rotated and reset from the reclining position toward the sitting position through the action of the reset member 130. The reset member 130 can be an elastic member, and the backrest bracket 110 can be reset under the elastic force of the elastic member. For example, the reset member 130 is a reset coil spring, which is sleeved on the hinge shaft Jz of the backrest bracket 110 and connected to the backrest bracket 110, including but not limited to this. In addition, the number of reset members 130 can be set according to actual needs, and this embodiment does not impose any restrictions on this.

[0051] It should be noted that in this embodiment, a limiter 120 is provided between the backrest bracket 110 and the base 300. The limiter 120 is connected or mated to the backrest bracket 110 and the base 300, respectively. By controlling the length of the limiter 120 (the second portion 122 of the limiter 120 is extended relative to the first portion 121 to adjust the length), the limit position of the backrest bracket 110 is controlled, thereby limiting the maximum reclining angle of the backrest 200. Since the limiter 120 is in sliding engagement with either the backrest bracket 110 or the base 300, the limiter 120 does not lock the backrest 200, but only limits the maximum reclining angle of the backrest 200, allowing the backrest 200 to rebound normally (the force causing the backrest 200 to rebound is provided by the reset member 130).

[0052] The backrest support assembly 100 is used for a chair. When using the chair, the user can lean back to different angles by leaning on the backrest 200, and the limit position of the backrest bracket 110 can be limited by the limit member 120 to limit the limit angle of reclining. Among them, since the first part 121 or the second part 122 of the limit member 120 slides with the backrest bracket 110 or the base 300 of the chair, the backrest bracket 110 is not completely locked, and the backrest 200 is not directly locked. If the user wants to adjust the angle and / or position of the backrest 200 relative to the base 300, he only needs to not apply the reclining force to the backrest 200 or reduce the reclining force. When the backrest 200 is subjected to a reclining force, the backrest bracket 110 will slide relative to the limiting member 120 connected to the base 300 or the limiting member 120 connected to the backrest bracket 110 will slide relative to the base 300 under the force applied by the reset member 130 to the backrest bracket 110, thereby enabling the backrest bracket 110 to directly drive the backrest 200 to rotate, so that the backrest 200 automatically adapts to the position of the user's back without operating the limiting member 120 to unlock it, which is simple to operate and easy to use; moreover, the backrest 200 can catch up in time, which helps to improve the convenience of the user in adjusting the angle of the backrest 200 when using the seat.

[0053] In some embodiments, reference Figure 2 and Figure 3 When the second portion 122 slides with the backrest bracket 110, the backrest bracket 110 is provided with a sliding groove C that slides with the second portion 122; or

[0054] When the second portion 122 is in sliding engagement with the seat base 300 , the seat base 300 is provided with a sliding groove C that forms a sliding engagement with the second portion 122 .

[0055] When the second part 122 slides with the backrest bracket 110 or the base 300 of the seat, the backrest bracket 110 and the base 300 of the seat both adopt the structural form of a slide groove C to form a sliding fit with the second part 122. The slide groove C involved can be roughly extended along the front and rear directions of the seat. The slide groove C can be a straight slide groove, or the slide groove C can also be an arc-shaped slide groove, which can be set according to actual needs.

[0056] The second portion 122 can form a sliding fit with the slide groove C through its end away from the first portion 121. When the backrest bracket 110 rotates from reclining to sitting upright, the end of the second portion 122 away from the first portion 121 slides along the slide groove C accordingly.

[0057] In some embodiments, the second portion 122 is configured with a sliding portion, which is disposed in the slide groove C and can slide along the slide groove C. Specifically, the sliding portion configured on the second portion 122 is adapted to the slide groove C, and the sliding portion is correspondingly disposed in the slide groove C to form a sliding fit with the slide groove C. There can be one slide groove C, or more than one, such as two or three. When there is more than one slide groove C, two slide grooves C can be provided, and the two slide grooves C can be disposed opposite each other along the left and right direction of the seat, with the sliding portion respectively received in the two slide grooves C and able to slide along the two slide grooves C.

[0058] The sliding part involved can adopt various structural forms, for example:

[0059] In some embodiments, reference Figure 4 The sliding part is a sliding shaft Z, which is accommodated in the chute C. The sliding part adopts the sliding shaft Z, which fits tightly with the chute C and can ensure the smoothness of relative movement, reduce friction and wear; in addition, the structure of the sliding shaft Z and the chute C is simple, easy to disassemble and assemble, and convenient for maintenance and replacement. Among them, when there is one chute C, one end of the sliding shaft Z is accommodated in the chute C and forms a sliding fit with it; when there are two chute Cs, such as Figures 2 to 4 As shown, one end of the sliding shaft Z may be accommodated in one of the two sliding grooves C and form a sliding fit therewith, and the other end of the sliding shaft Z may be accommodated in the other of the two sliding grooves C and form a sliding fit therewith.

[0060] Alternatively, in some embodiments, the sliding portion is a pulley, which is accommodated in a chute C. When the sliding portion is a pulley, the pulley slides relative to the chute C and also rolls in the chute C, which can significantly reduce friction during movement, improve sliding smoothness, and avoid sticking. Specifically, when there is one chute C, one side of the pulley is accommodated in the chute C and forms a sliding engagement therewith; when there are two chute Cs, one side of the pulley can be accommodated in one of the two chute Cs and form a sliding engagement therewith, while the other side of the pulley is accommodated in the other of the two chute Cs and forms a sliding engagement therewith.

[0061] In some embodiments, reference Figure 2 and Figure 4 The limiting member 120 is a gas spring, the first portion 121 is the cylinder of the gas spring, and the second portion 122 is the piston rod of the gas spring. In this embodiment, the limiting member 120 is a gas spring, and the first portion 121 and the second portion 122 of the limiting member 120 correspond to the cylinder and the piston rod of the gas spring, respectively.

[0062] In a gas spring, the cylinder, the main component, is filled with high-pressure gas. One end of the piston rod is connected to the cylinder, while the other end extends outside the cylinder to withstand external loads. A gas spring operates by filling a sealed cylinder with an inert gas or oil-gas mixture, raising the pressure inside the cylinder to several or even dozens of times higher than atmospheric pressure. The piston rod's movement is achieved by utilizing the pressure difference created by the smaller cross-sectional area of ​​the piston rod than the piston. When an external force acts on the piston rod, the gas in the cylinder is compressed, generating an elastic force that provides support and cushioning. When the external force acting on the piston rod disappears, the gas in the cylinder expands, pushing the piston rod back into its original position.

[0063] The cylinder has two opposing ends. One end of the cylinder is where the piston rod extends and retracts from. The other end of the cylinder can be connected to or mated with an external structure or component. The end of the piston rod that extends outside the cylinder is the extended end, which can be connected to or mated with an external structure or component.

[0064] When the first portion 121 of the stopper 120 is connected to the seat base 300 and the second portion 122 is slidably engaged with the backrest bracket 110, based on the structural configuration of the stopper 120 using a gas spring, the following can be achieved: In some embodiments, the piston rod of the gas spring is extended and retracted from one end of the cylinder body, the other end of the cylinder body is hingedly connected to the seat base 300, and the extended end of the gas spring piston rod is slidably engaged with the backrest bracket 110. In combination with the aforementioned embodiment, the extended end of the gas spring piston rod is optionally configured with a sliding portion, wherein the sliding portion can be a sliding shaft Z or a pulley.

[0065] When the first portion 121 of the stopper 120 is connected to the backrest bracket 110 and the second portion 122 is slidably engaged with the seat base 300, based on the structural configuration of the stopper 120 using a gas spring, the following can be achieved: In some embodiments, the piston rod of the gas spring is extended and retracted from one end of the cylinder body, the other end of the cylinder body is hingedly connected to the backrest bracket 110, and the extended end of the gas spring piston rod is slidably engaged with the seat base 300. In combination with the above embodiment, the extended end of the gas spring piston rod is optionally configured with a sliding portion, wherein the sliding portion can be a sliding shaft Z or a pulley.

[0066] In some embodiments, reference Figure 2 and Figure 4 The extended end of the gas spring's piston rod is connected to a switch G, which is used to lock or unlock the gas spring's piston rod. When switch G is on, the corresponding piston rod of the gas spring is unlocked, and the gas spring's piston rod switches to a movable state, allowing it to extend and retract relative to the cylinder body; when switch G is off, the corresponding piston rod of the gas spring is locked, and the gas spring's piston rod switches to a fixed state, preventing it from extending and retracting relative to the cylinder body. The user can control switch G to lock or unlock the gas spring's piston rod's telescopic function, thereby changing the extended length of the piston rod to adjust the length of the gas spring and lock the reclining angle.

[0067] The switch G can be of various types. For example, the switch G can be a wire-operated switch connected to a pull wire. When the wire-operated switch is pulled by the pull wire, the wire-operated switch unlocks the piston rod of the gas spring; when the wire-operated switch is released, the wire-operated switch locks the piston rod of the gas spring. This is merely exemplary and not restrictive. Other types of switches may also be used.

[0068] The working principle can be as follows:

[0069] When the seat is in the upright position, the gas spring is at its longest length. When a user applies a reclining force to the backrest 200, causing the backrest bracket 110 to rotate backward, the gas spring is compressed by pulling the wire switch. Releasing the wire switch locks the length of the gas spring. When the user no longer applies a reclining force to the backrest, since one end of the gas spring is in the slide groove C and is free (not fixed), the backrest bracket 110 automatically returns to its original position due to the force of the reset member 130. Furthermore, if the user pulls the wire switch at this time, the gas spring automatically returns to its original length and applies additional force to the backrest bracket 110 to help it return to its original position.

[0070] The limiting member 120 is located between the base connection portion 112 and the seat base 300 , and its specific location includes various locations.

[0071] Reference Figure 5, one of which can be: the limit member 120 is located at the lower rear side of the rotation axis X of the backrest bracket 110. Specifically, with the front-to-back direction of the seat as a reference direction, the limit member 120 is arranged behind the rotation axis X of the backrest bracket 110 and is located at the lower side of the rotation axis X of the backrest bracket 110. When the seat is in the upright position, the limit member 120 is in its longest state. When a person applies a backward force to the backrest 200 to rotate the backrest bracket 110 backward, the limit member 120 is compressed and shortened. By arranging the limit member 120 at the lower rear side of the rotation axis of the backrest bracket 110, the limit member 120 is less likely to interfere with other components (such as the backrest 200, etc.).

[0072] Reference Figure 5 Alternatively, the stopper 120 may be located above and in front of the rotation axis X of the backrest bracket 110. Specifically, with the seat's fore-aft direction as a reference, the stopper 120 is positioned in front of and above the rotation axis X of the backrest bracket 110. When the seat is in the upright position, the stopper 120 is at its shortest position. When a user applies a backward force to the backrest 200, causing the backrest bracket 110 to rotate rearward, the stopper 120 extends.

[0073] In some embodiments, reference Figure 2 A rotating member 140 is installed at one end of the base connecting portion 112 away from the backrest supporting portion 111, and the base connecting portion 112 is rotatably connected to the base 300 of the seat through the rotating member 140. The rotating member 140 can be in the form of a rotating frame, a rotating seat, or the like. The rotating member 140 can be provided with a hinge shaft Jz and be hinged to the base 300 of the seat through the hinge shaft Jz to form a rotatable connection relationship. The base connecting portion 112 can be connected to the rotating member 140 to achieve a rotatable connection with the base 300 of the seat. Specifically, the rotating member 140 rotates relative to the base 300 of the seat, thereby driving the backrest bracket 110 to rotate relative to the base 300 of the seat. Alternatively, when the backrest bracket 110 rotates, it rotates on the base 300 of the seat through the rotating member 140.

[0074] The base connection portion 112 and the rotating member 140 may be detachably connected, and the detachable connection may be in the form of a screw connection, a snap connection, etc. Thus, in daily use, if the backrest bracket 110 needs to be inspected and repaired, it is only necessary to remove the backrest bracket 110 from the rotating member 140, which is simple to operate and convenient to use.

[0075] In some embodiments, reference Figure 2 and Figure 6The rotating member 140 includes a bracket connection portion 141 and a base hinge portion 142 integrally formed with the bracket connection portion 141. The bracket connection portion 141 is detachably connected to the backrest bracket 110, and the base hinge portion 142 is configured to be hingedly connected to the seat base 300. The rotating member 140 comprises the bracket connection portion 141 and the base hinge portion 142. The integral formation of the bracket connection portion 141 and the base connection portion 112 ensures the overall structural strength and stability of the rotating member 140. The rotating member 140 is detachably connected to the backrest bracket 110 via the bracket connection portion 141. The detachable connection may include a screw connection, a snap connection, or the like. Furthermore, the rotating member 140 is hingedly connected to the seat base 300 via the base hinge portion 142. Optionally, two base hinge portions 142 may be provided, with the two base hinge portions 142 positioned opposite each other along the left-right direction of the seat and each hingedly connected to the base 300 via a hinge axis Jz.

[0076] In some embodiments, reference Figure 2 and Figure 6 The reset member 130 is a reset spring. One end of the reset spring acts on the base hinge 142, and the other end of the reset spring can be connected to the base 300 of the seat. The reset member 130 adopts a reset spring, and the elastic force of the reset spring causes the backrest bracket 110 to rotate and reset. The structure is simple and reliable, easy to set up and has a long service life. Among them, one or more reset springs can be provided. When one reset spring is provided, the reset spring can be arranged at the center line position in the left and right direction of the seat and extend along the front and back direction of the seat; when more than one reset spring is provided, more than one reset spring is arranged in sequence along the left and right direction of the seat, and the distance between any two adjacent reset springs remains equal, which can provide a stable elastic force for the backrest bracket 110, so that the backrest bracket 110 rotates smoothly when reset.

[0077] The working principle of the return spring can be: when the backrest bracket 110 is subjected to an external force and rotates backward, the base hinge part 142 squeezes the return spring to compress and deform the return spring; and when the external force acting on the backrest bracket 110 is removed, the return spring stretches and restores to drive the base hinge part 142 to move, thereby causing the rotating part 140 to drive the backrest bracket 110 to rotate and reset.

[0078] The present invention also provides a chair comprising a base 300, a backrest 200, and a backrest support assembly 100 as described in the aforementioned embodiments. A backrest support portion 111 supports the backrest 200, and a base connection portion 112 is rotatably connected to the base 300. The specific structure of the backrest support assembly 100 is similar to that of the aforementioned embodiments. Since the present chair utilizes all technical solutions of all of the aforementioned embodiments, it possesses at least all the technical effects provided by the technical solutions of the aforementioned embodiments, and therefore, no further details will be given here.

[0079] The above description is only part or preferred embodiments of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A backrest support assembly for a seat, characterized in that: The back support assembly comprises: A backrest bracket, comprising a backrest support portion and a base connection portion, wherein the backrest support portion is used to support the backrest of the seat, and the base connection portion can be rotatably connected to the base of the seat; a limiting member comprising a first portion and a second portion that is retractable relative to the first portion, wherein one of the first portion and the second portion is used to connect the backrest bracket and the seat base, and the other of the first portion and the second portion is slidably engaged with the other of the backrest bracket and the seat base; A reset member is provided on the base of the seat, and the reset member can apply a force to the backrest bracket to reset it.

2. The back support assembly according to claim 1, wherein: When the second part is in sliding engagement with the backrest bracket, the backrest bracket is provided with a sliding groove that forms a sliding engagement with the second part; or When the second part is in sliding engagement with the base of the seat, the base of the seat is provided with a sliding groove that forms a sliding engagement with the second part.

3. The back support assembly according to claim 2, wherein: The second portion is configured with a sliding portion, which is disposed in the sliding groove and can slide along the sliding groove.

4. The back support assembly according to claim 3, wherein: The sliding portion is a sliding shaft, and the sliding shaft is accommodated in the sliding groove; or, The sliding part is a pulley, and the pulley is accommodated in the sliding groove.

5. The back support assembly according to claim 1, wherein: The limiting component is a gas spring, the first part is a cylinder of the gas spring, and the second part is a piston rod of the gas spring.

6. The back support assembly according to claim 5, wherein: The piston rod of the gas spring is extended and retracted from one end of the cylinder body, and the other end of the cylinder body is used to be hinged to the base of the seat, and the extended end of the piston rod of the gas spring is slidably matched with the backrest bracket; or, The piston rod of the gas spring is extended and retracted from one end of the cylinder body, and the other end of the cylinder body is used to be hinged to the backrest bracket. The protruding end of the piston rod of the gas spring is slidably matched with the base of the seat.

7. The back support assembly according to claim 5, wherein: The extended end of the piston rod of the gas spring is connected to a switch, and the switch is used to lock or unlock the piston rod of the gas spring.

8. The back support assembly according to claim 1, wherein: A rotating member is installed at one end of the base connecting portion away from the backrest supporting portion, and the base connecting portion is rotatably connected to the base of the seat through the rotating member.

9. The back support assembly according to claim 8, wherein: The rotating member includes a bracket connecting portion and a base hinge portion integrally formed with the bracket connecting portion. The bracket connecting portion is detachably connected to the backrest bracket, and the base hinge portion is used to be hinged to the base of the seat.

10. The back support assembly according to claim 9, wherein: The reset member is a reset spring, one end of which acts on the base hinge portion, and the other end of which can be connected to the base of the seat.

11. A seat, characterized in that: The backrest comprises a base, a backrest and the backrest support assembly according to any one of claims 1 to 10, wherein the backrest support portion supports the backrest, and the base connection portion is rotatably connected to the base.

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