Seat with split backrest

Abstract

The utility model discloses a seat with a split backrest, which comprises a base, a cushion and the backrest, and the cushion is mounted on the base; the backrest comprises a waist rest, a backrest and an elastic connecting piece, the waist rest is connected to the cushion, one end of the elastic connecting piece is connected to the backrest, the other end of the elastic connecting piece is connected to the base, the backrest is movably arranged above the waist rest, when a user sits on the backrest, the backrest leans backwards under the pressure of the back of the user, the elastic connecting piece is driven to deform, and the backrest inclines backwards. The backrest is designed to be of a split structure of the waist rest and the back rest, and is matched with the elastic connecting piece, so that when a user leans backwards, the waist rest can continuously and stably support the waist of the user, the waist is effectively prevented from being suspended, and the fatigue feeling of the waist of the user is reduced. When a user leans backwards, the backrest can incline backwards independently, back leaning backwards in a real sense is achieved, the problem that the gravity center of an existing seat of an integrated structure moves backwards but the sitting posture does not really lean backwards is solved, and the sitting posture adjusting experience better conforming to human engineering is provided for the user.

Description

Technical Field

[0001] This utility model relates to the technical field of seats, and in particular to a seat with a split backrest. Background Technology

[0002] Chairs are indispensable tools in daily life and work. Currently, chairs on the market are mainly divided into two types. One type has a one-piece structure where the seat and backrest are integrated. When the user sits and leans back, both the base and backrest tilt backward simultaneously. This design shifts the user's center of gravity backward, meaning the user's overall posture isn't truly leaning back. Furthermore, the seat cushion supports the user's buttocks as they lean backward, affecting comfort and overall experience. The other type has a separate structure where the seat and backrest are separate. When the user leans back, the entire back arches backward, which can easily cause the lumbar region to be unsupported, resulting in ineffective lumbar support and also failing to provide optimal user experience. Therefore, there is an urgent need to design a new type of chair to solve these problems. Utility Model Content

[0003] This utility model aims to at least partially solve one of the problems in the related technology. Therefore, one of the objectives of this utility model is to provide a split-backrest seat to address the problems of insufficient lumbar support when the user leans back and unsatisfactory overall posture adjustment in existing seats, thereby improving user comfort and experience.

[0004] A split-back seat, the split-back seat comprising:

[0005] Base;

[0006] A seat cushion, which is mounted on the base;

[0007] The backrest includes a lumbar support, a backrest, and an elastic connector. The lumbar support is connected to the seat cushion. One end of the elastic connector is connected to the backrest, and the other end is connected to the base. The backrest is movably positioned above the lumbar support. When the user sits and leans back, the backrest is tilted back by the pressure of the user's back, which drives the elastic connector to deform and causes the backrest to tilt backward.

[0008] Furthermore, the elastic connector is made of spring steel or stainless steel.

[0009] Furthermore, the number of elastic connectors is two, and the two elastic connectors are symmetrically arranged on both sides with the base as the center.

[0010] Furthermore, the number of elastic connectors is several, and the several elastic connectors are spaced apart along the width direction of the lumbar support.

[0011] Furthermore, the backrest also includes a fixing member, which connects the ends of several elastic connecting members and is connected to the bottom of the seat cushion.

[0012] Furthermore, one end of the elastic connector is connected to the side of the backrest close to the lumbar support.

[0013] Furthermore, the elastic connector is arranged in a curved shape, and when the backrest is in a state without backward pressure, the outer surface of the elastic connector is in contact with the outer surface of the lumbar support.

[0014] Furthermore, the base includes a support frame, a turntable shaft, and a support plate. The support frame is placed on the support surface, one end of the turntable shaft is rotatably connected to the support frame, and the other end is fixedly connected to the support plate. The seat cushion is installed on the support plate.

[0015] Furthermore, the end of the elastic connector is spaced apart from the support plate.

[0016] Furthermore, the backrest also includes a cover that covers several of the resilient connectors.

[0017] Compared with the prior art, the technical solution provided in this application has the following advantages: This application provides a split-back chair, including a base, a seat cushion, and a backrest. The backrest is further subdivided into a lumbar support and a backrest. The base is placed on a support surface, serving as the supporting foundation for the entire chair; the seat cushion is installed on the base to support the user's buttocks. The lumbar support is connected to the seat cushion, providing initial support for the user's lower back. This chair also includes an elastic connector. One end of the elastic connector is connected to the base, and the other end is connected to the backrest, which is movably positioned above the lumbar support. When the user sits and leans back, the backrest is pushed back by the pressure of the user's back, simultaneously driving the elastic connector to deform. This design allows the user's back to tilt backward while the lumbar support maintains its relative position to the seat cushion, continuously providing stable support for the user's lower back. When the user returns to a normal sitting posture, the elastic connector returns to its initial state due to its elasticity, causing the backrest to return to its initial position.

[0018] By designing the backrest as a separate lumbar support and reclining backrest, coupled with elastic connectors, the lumbar support provides continuous and stable support to the user's lower back when leaning back, effectively preventing the lower back from being unsupported and reducing user fatigue. The reclining backrest can also tilt independently when the user leans back, achieving true back recline and overcoming the problem of existing one-piece chairs where the center of gravity shifts backward but the sitting posture doesn't truly recline, providing users with a more ergonomic seating adjustment experience. The elastic connectors allow the reclining backrest to automatically adjust according to the user's movements and automatically return to its normal sitting posture, eliminating the need for manual operation and improving ease of use. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] In the attached image:

[0022] Figure 1 This is a structural schematic diagram of an embodiment of the split-back seat of this application;

[0023] Figure 2 This is a rear view of the split-back seat according to an embodiment of this application;

[0024] Figure 3 This is a bottom view of the split-back seat according to an embodiment of this application;

[0025] Figure 4 This is a left view of an embodiment of the split-back seat according to this application.

[0026] Figure 5 This is a left view of another embodiment of the split-back seat according to the present application.

[0027] Figure label:

[0028] 1. Split-back seat; 10. Base; 11. Support frame; 13. Turntable shaft; 15. Support plate; 30. Seat cushion; 50. Backrest; 51. Lumbar support; 53. Backrest; 55. Elastic connector; 57. Fixture; 59. Cover. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] like Figures 1 to 5 As shown, the present application provides a split-back seat 1, comprising:

[0032] Base 10;

[0033] Seat cushion 30, seat cushion 30 is installed on base 10;

[0034] The backrest 50 includes a lumbar support 51, a backrest 53, and an elastic connector 55. The lumbar support 51 is connected to the seat cushion 30. One end of the elastic connector 55 is connected to the backrest 53, and the other end is connected to the base 10. The backrest 53 is movably positioned above the lumbar support 51. When the user sits and leans back, the backrest 53 leans back under the pressure of the user's back, driving the elastic connector 55 to deform and causing the backrest 53 to tilt backward.

[0035] The base 10 serves as the supporting foundation for the entire seat, resting on the supporting surface. Its primary function is to bear the weight of the entire seat and the user, ensuring the seat's stability during use. It provides a platform for the installation and support of other components, allowing the seat to stand stably on the supporting surface. In this embodiment, the supporting surface is generally the ground; in other embodiments, it can be a floor, countertop, etc., and is not limited thereto.

[0036] As a basic component, the seat cushion 30 is mounted on the base 10. This connection method transmits the pressure applied by the user to the seat cushion 30 to the base 10, and then the base 10 distributes it to the support surface. At the same time, one end of the elastic connector 55 is connected to the base 10, which allows the force of the backrest 53 to be transmitted to the base 10 through the elastic connector 55 when the user leans back, ensuring the mechanical balance of the entire seat structure.

[0037] The seat cushion 30 is mounted on the base 10 and comes into direct contact with the user's buttocks, providing a comfortable seating experience. It acts as a cushion and support, reducing pressure on the buttocks during prolonged sitting and improving overall comfort. The seat cushion 30 is connected to the lumbar support 51, ensuring that the lumbar support 51 provides relatively stable support for the user's lower back. When the user sits on the seat cushion 30, their posture and movements affect the connected lumbar support 51 and backrest 53 through the seat cushion 30.

[0038] The lumbar support 51 is connected to the seat cushion 30, and its main function is to provide support for the user's lower back. During the user's normal sitting posture and reclining, the lumbar support 51 always maintains a constant relative position with the seat cushion 30, continuously providing stable support for the lower back, preventing the lower back from being unsupported, and reducing lower back fatigue and discomfort.

[0039] The lumbar support 51 is directly connected to the seat cushion 30, providing a relatively stable support base for the backrest 53. The backrest 53 is movably positioned above the lumbar support 51, forming a relative movable relationship between the two, allowing the backrest 53 to be adjusted independently when the user leans back.

[0040] The backrest 53 is movably positioned above the lumbar support 51 and serves as the primary support component when the user leans back. When the user leans back while seated, the backrest 53 is pushed back by the pressure of the user's back, causing the elastic connector 55 to deform and achieve the effect of tilting the user's back backward, providing the user with a more comfortable sitting posture adjustment experience.

[0041] The backrest 53 and the lumbar support 51 are connected by a movable connection, enabling relatively independent movement. At the same time, the backrest 53 is connected to the elastic connector 55. When leaning back, the force is transmitted to the elastic connector 55, causing the elastic connector 55 to deform. When the user returns to a normal sitting posture, the restoring force of the elastic connector 55 drives the backrest 53 back to its initial position.

[0042] One end of the elastic connector 55 is connected to the backrest 53, and the other end is connected to the base 10. It serves to connect the backrest 53 and the base 10 and plays a crucial role in elastic adjustment during the user's leaning back and returning to a sitting position. When the backrest 53 leans back, the elastic connector 55 deforms and stores elastic potential energy; when the user returns to a sitting position, the elastic connector 55 releases the elastic potential energy, causing the backrest 53 to return to its initial position.

[0043] The elastic connector 55 acts as a bridge connecting the backrest 53 and the base 10. Through its elastic deformation and recovery, it enables the backrest 53 to tilt back and return to its original position. It links the movement of the backrest 53 with the stability of the base 10, ensuring the coordinated operation of the entire seating system.

[0044] When a user sits in the seat and leans back, the backrest applies pressure to the backrest 53, causing the backrest 53 to rotate backward around its connection point with the lumbar support 51, simultaneously deforming the elastic connector 55 connected to it. During this process, the lumbar support 51 and the seat cushion 30 maintain their relative positions, continuously providing support for the user's lower back. When the user returns to a normal sitting posture, the elastic connector 55 returns to its initial state due to its elasticity, causing the backrest 53 to return to its initial position, thus achieving good support and adjustment functions for the split-back seat 1 during the user's leaning back and returning to a sitting posture.

[0045] Furthermore, the elastic connector 55 is made of spring steel or stainless steel.

[0046] Both spring steel and stainless steel possess excellent elasticity and strength, meeting the requirements of frequent deformation and return to normal operation of the elastic connector 55 during seat use. Spring steel or stainless steel was chosen because their superior elasticity and strength ensure that the elastic connector 55 is not easily damaged during long-term use, stably performing its function, ensuring smooth reclining and return to normal operation of the seat, and improving the seat's durability. Furthermore, the elastic connector 55 made of spring steel and stainless steel has a simple structure, simple manufacturing process, and low cost.

[0047] In other embodiments, the elastic connector 55 can also be a shape memory alloy or a high-strength fiber composite material. Shape memory alloys have a unique shape memory effect, capable of returning to a pre-set shape at a specific temperature. When applied to the elastic connector 55, after undergoing significant deformation, it can return to its original shape as long as the corresponding temperature is reached, ensuring the precise reset of the seat backrest 53 during long-term use. For example, even if the backrest 53 frequently reclines and resets during daily use of the seat, the shape memory alloy elastic connector 55 can still maintain stable performance. High-strength fiber composite materials, such as carbon fiber and aramid fiber, combined with a resin matrix, not only possess high strength and low density but also good flexibility and elasticity. Elastic connectors 55 made from such materials can withstand greater forces, ensuring the stability of the seat, while also allowing for flexible adjustment of the backrest 53, and reducing the overall weight of the seat, meeting the demand for lightweight seating.

[0048] Furthermore, there are two elastic connectors 55, which are symmetrically arranged on both sides with the base 10 as the center.

[0049] The symmetrical arrangement on both sides allows for more even force distribution on the backrest 53, ensuring stability during the reclining and return processes. The two elastic connectors 55 are also symmetrically positioned, ensuring balanced tension on both sides of the backrest 53 when the user reclines, preventing tilting or wobbling and providing a more stable and comfortable experience. This also enhances the stability and reliability of the seat structure.

[0050] Furthermore, there are several elastic connectors 55, and these elastic connectors 55 are spaced apart along the horizontal direction of the base 10.

[0051] Multiple spaced elastic connectors 55 provide more even support, adapting to different user body shapes and reclining habits. Compared to two elastic connectors 55, several spaced elastic connectors 55 can more precisely distribute the force on the backrest 53. Different users have different points of force and intensity when reclining; this design better meets diverse needs, ensuring the seat maintains good performance under various usage conditions and improving its versatility.

[0052] Furthermore, the backrest 50 also includes a fastener 57, which connects to the ends of several elastic connectors 55 and is connected to the bottom of the seat cushion 30.

[0053] To ensure the stable functioning of the elastic connector 55, a reliable connection structure is required. The fastener 57 connects the ends of several elastic connectors 55 together and links them to the bottom of the seat cushion 30, forming a robust connection system. This not only prevents the elastic connectors 55 from shaking or shifting during use, but also allows them to better transmit the force of the backrest 53 to the seat cushion 30 and the base 10, ensuring the overall stability of the seat structure.

[0054] Furthermore, one end of the elastic connector 55 is connected to the side of the backrest 53 near the lumbar support 51.

[0055] Specifically, this connection method is more conducive to the backward tilting and resetting movements of the backrest 53, allowing the elastic connector 55 to function more effectively. By positioning the elastic connector 55 to the backrest 53 near the bottom, when the user tilts back, the bottom of the backrest 53 receives force first. The elastic connector 55 at this point reacts quickly, generating deformation and tension to propel the backrest 53 backward smoothly. During resetting, it also better guides the backrest 53 back to its initial position, making the entire movement smoother and more natural.

[0056] Furthermore, the elastic connector 55 is arranged in a curved shape, and when the backrest 53 is in a state without backward pressure, the outer surface of the elastic connector 55 is in contact with the outer surface of the lumbar support 51.

[0057] The curved extension design increases the elastic deformation capacity of the elastic connector 55, while the design that conforms to the lumbar support 51 makes the overall seat more compact and aesthetically pleasing, while also helping to protect the elastic connector 55. The curved shape allows the elastic connector 55 to deform to a greater extent under stress, storing more elastic potential energy and providing more power for the reclining and returning of the backrest 53. The design that conforms to the lumbar support 51 not only makes the seat look cleaner but also prevents the elastic connector 55 from being exposed, reducing the risk of it being damaged by impact.

[0058] Furthermore, the base 10 includes a support frame 11, a turntable shaft 13, and a support plate 15. The support frame 11 is placed on the support surface, one end of the turntable shaft 13 is rotatably connected to the support frame 11, and the other end is fixedly connected to the support plate 15. The seat cushion 30 is installed on the support plate 15.

[0059] The base 10, serving as the supporting component of the seat, is crucial to the seat's stability and functionality. The support frame 11, turntable shaft 13, and support plate 15 cooperate with each other. The support frame 11 provides stable support, while the turntable shaft 13 allows the support plate 15 and seat cushion 30 to rotate, meeting the user's needs in different scenarios. For example, in an office setting, the user can easily rotate the seat to communicate with others, enhancing the seat's practicality. Similarly, in this embodiment, the supporting surface is generally the ground; in other embodiments, it can also be a floor, tabletop, etc., and is not limited here.

[0060] Furthermore, the end of the elastic connector 55 is spaced apart from the support plate 15.

[0061] In actual operation of the seat, the elastic connector 55 needs to deform and return to its original position freely. The end of the elastic connector 55 is spaced apart from the support plate 15, which effectively prevents the elastic connector 55 from rubbing or colliding with the support plate 15 when deformed, ensuring smooth operation, reducing the possibility of failure, and extending the service life of the seat.

[0062] Furthermore, the backrest 50 also includes a cover 59, which covers a number of resilient connectors 55.

[0063] The addition of the cover 59 primarily serves to protect the elastic connector 55 and enhance the appearance of the seat. The cover 59 encloses the elastic connector 55, preventing dust and debris from adhering to it and affecting its performance. It also prevents users from coming into contact with the elastic connector 55, reducing the risk of accidental injury, while simultaneously making the seat look more aesthetically pleasing and tidy.

[0064] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A split-back seat, characterized in that, include: Base; A seat cushion, which is mounted on the base; The backrest includes a lumbar support, a backrest, and an elastic connector. The lumbar support is connected to the seat cushion. One end of the elastic connector is connected to the backrest, and the other end is connected to the base. The backrest is movably positioned above the lumbar support. When the user sits and leans back, the backrest is tilted back by the pressure of the user's back, which drives the elastic connector to deform and causes the backrest to tilt backward.

2. A split-back seat according to claim 1, characterized in that, The elastic connector is made of spring steel or stainless steel.

3. A split-back seat according to claim 1, characterized in that, The number of elastic connectors is two, and the two elastic connectors are arranged symmetrically on both sides with the base as the center.

4. A split-back seat according to claim 1, characterized in that, The number of elastic connectors is several, and the several elastic connectors are spaced apart along the width direction of the lumbar support.

5. A split-back seat according to claim 4, characterized in that, The backrest also includes a fixing member, which connects the ends of several elastic connecting members and is connected to the bottom of the seat cushion.

6. A split-back seat according to any one of claims 1 to 5, characterized in that, One end of the elastic connector is connected to the side of the backrest close to the lumbar support.

7. A split-back seat according to any one of claims 1 to 5, characterized in that, The elastic connector is curved and extends so that when the backrest is in a state without backward pressure, the outer surface of the elastic connector fits against the outer surface of the lumbar support.

8. A split-back seat according to claim 4 or 5, characterized in that, The base includes a support frame, a turntable shaft, and a support plate. The support frame is placed on the support surface. One end of the turntable shaft is rotatably connected to the support frame, and the other end is fixedly connected to the support plate. The seat cushion is installed on the support plate.

9. A split-back seat according to claim 8, characterized in that, The ends of several of the elastic connectors are spaced apart from the support plate.

10. A split-back seat according to claim 4, characterized in that, The backrest also includes a cover that covers several of the resilient connectors.

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