CN-121985894-A - Back support assembly and seat with same

Abstract

According to various embodiments, a back support assembly for a seat may be provided. The back support assembly may include a back support mounting frame and a displaceable member that is displaced relative to the back support mounting frame. The back support assembly may further comprise a motion converter operable to couple the displaceable member to the back support mounting frame. The motion converter may be configured to convert an input motion applied to the motion converter into an output motion that displaces the displaceable member along the primary axis of movement. The back support assembly may further comprise linkage means for coupling the one or more back support members to the displaceable member, the linkage means being operatively engaged with the displaceable member for movement relative to the displaceable member along a secondary axis of movement that is non-parallel to the primary axis of movement.

Inventors

• Gilbert Ruiluyou
• WU SUNDE
• Zhuang Menxin

Assignees

• 雷蛇(亚太)私人有限公司

Dates

Publication Date

20260505

Application Date

20230807

Claims (20)

1. 1. A back support assembly for a seat, the back support assembly comprising: a back support mounting frame for a backrest of the seat; A displaceable member displaceable along a main movement axis relative to the back support mounting frame; a motion converter operably coupling the displaceable member to the back support mounting frame; Wherein the motion converter is configured to convert an input motion applied to the motion converter relative to the back support mounting frame into an output motion that displaces the displaceable member relative to the back support mounting frame and along the primary axis of movement, Wherein the main movement axis extends through the back support mounting frame in a thickness direction of the back support mounting frame, and A linkage arrangement for coupling one or more back support members to the displaceable member, the linkage arrangement being operatively engaged with the displaceable member so as to be movable relative to the displaceable member along a secondary axis of movement that is non-parallel to the primary axis of movement.
2. 2. The back support assembly of claim 1, Wherein the motion converter comprises: An input receiving member movable relative to the back support mounting frame for receiving the input motion, and An output member engaged with the input receiving member, wherein the output member is further coupled to the displaceable member in such a way as to transmit the output motion to the displaceable member for displacing the displaceable member relative to the back support mounting frame and along the primary axis of movement.
3. 3. The back support assembly of claim 2, Wherein the input receiving member comprises a rotatable member rotatable to input a rotational input motion into the motion converter, the rotational input motion being converted by the motion converter into a linear output motion for displacing the displaceable member relative to the back support mounting frame and along the main movement axis.
4. 4. The back support assembly of claim 3, Wherein the input receiving member of the motion converter comprises a threaded shaft rotatable about an axis of rotation extending through the threaded shaft; wherein the rotation axis is parallel to the main movement axis, and Wherein the output member comprises an internally threaded cylinder in operative threaded engagement with the threaded shaft such that rotational input movement of the threaded shaft about the rotational axis results in threaded displacement of the internally threaded cylinder relative to the threaded shaft along the primary axis of movement.
5. 5. The back support assembly of claim 4, Wherein the threaded shaft includes a plurality of external threads, and Wherein the plurality of external threads comprises a multi-start thread.
6. 6. The back support assembly of claim 1, Wherein the linkage comprises a lever member operably engaged with the displaceable member such that the lever member is movable relative to the displaceable member along the secondary axis of movement.
7. 7. The back support assembly of claim 1, Wherein the displaceable member comprises a guide; wherein the guide defines a linear path on the displaceable member for moving the linkage along the linear path, and Wherein the linear path is parallel to the secondary axis of movement.
8. 8. The back support assembly of claim 7, Wherein the linkage comprises a movable tab; wherein the displaceable member includes a tab guide, and Wherein the tab guide comprises opposed pairs of longitudinal inner surfaces of the displaceable member defining the linear path for moving the movable tab along the linear path.
9. 9. The back support assembly of claim 8, Wherein the tab guide comprises a first engagement means; Wherein the movable tab comprises a second engagement means, and Wherein the first engagement means and the second engagement means are configured to engage each other for releasably holding the movable tab in position relative to the tab guide.
10. 10. The back support assembly of claim 8, Wherein the tab guide comprises an alignment rod parallel to the linear path; Wherein the movable tab defines an aperture, and Wherein the alignment rod extends through the aperture of the movable tab.
11. 11. The back support assembly of claim 1, further comprising: a handle device is coupled to the linkage device for moving the linkage device along the secondary axis of movement.
12. 12. The back support assembly of claim 11, Wherein, the handle device includes: A cantilever handle member secured to the linkage arrangement at a first end of the cantilever handle member; Wherein the opposite second free end of the cantilevered handle member acts as a handle portion for moving the linkage.
13. 13. The back support assembly of claim 12, Wherein said linkage assembly and said first end of said cantilever handle member are on a first side of said back support mounting frame, Wherein a middle portion of the cantilever handle member extends from the first end of the cantilever handle member across one side of the back support mounting frame in the thickness direction of the back support mounting frame to a second side of the back support mounting frame, the second side being opposite the first side of the back support mounting frame; wherein the second free end of the cantilever handle member extends from the intermediate portion of the cantilever handle member in a direction away from the second side of the back support mounting frame.
14. 14. The back support assembly of claim 1, further comprising: A pair of back support members coupled to the displaceable member by the linkage.
15. 15. The back support assembly of claim 14, Wherein the pair of back support members are arranged adjacent to each other along a lateral direction that is not parallel to both the primary and secondary movement axes.
16. 16. A seat, comprising: Backrest and The back support assembly of claim 1, mounted to the backrest.
17. 17. The seat of claim 16, further comprising: A head support assembly comprising: a head support mount releasably mounted to the backrest, A head support link member pivotally coupled to the head support mount at a first end thereof so as to pivot about a main pivot axis relative to the head support mount, and A connector pivotably coupled to the second end of the head support link member at a first portion of the connector for pivoting about a secondary pivot axis relative to the head support link member, the secondary pivot axis being parallel to the primary pivot axis; Wherein the primary pivot axis is orthogonal to the primary axis of movement.
18. 18. The seat of claim 17, further comprising: A head support member is operatively coupled to the second portion of the connector such that the head support member is movable along an axis of displacement orthogonal to the secondary pivot.
19. 19. The seat according to claim 18, Wherein the second portion of the connector comprises a guide element defining a guide path extending parallel to the displacement axis for guiding movement of the head support member.
20. 20. The seat according to claim 19, Wherein the guide element comprises a tubular member having an inner guide channel extending parallel to the displacement axis, and Wherein the head support member comprises a shaft slidably inserted into the guide channel.

Description

Back support assembly and seat with same Technical Field Embodiments relate generally to back support assemblies and, more particularly, to back support assemblies for seats. Background Conventional seats often lack sufficient lumbar support, which can lead to discomfort and posture related problems for the user. While some seats may provide a basic backrest, they generally do not provide effective support specifically for the lumbar region of the spine. The lumbar region is located in the lower back and requires proper support to maintain good spinal alignment and to prevent strain or pain during prolonged sitting. Many conventional seats have a universal back design that does not meet personal ergonomic requirements. These backrests may lack adjustability, thereby limiting the ability of the user to customize the support according to their unique preferences. Thus, users with specific lumbar support requirements may find themselves unable to achieve the desired comfort and optimal sitting posture. Even though seats with lumbar support options are on the market, they do not fully meet everyone's needs. Different users have different characteristics, such as curvature of the spine. Standard lumbar support systems may not provide the necessary flexibility or customization to meet these different needs. Accordingly, there is a need for an improved backrest assembly for a seat that solves at least the above-mentioned problems. Disclosure of Invention According to various embodiments, a back support assembly for a seat may be provided. The back support assembly may include a back support mounting frame for a backrest of the seat. The back support assembly may comprise (e.g. further comprise) a displaceable member displaceable along the main movement axis relative to the back support mounting frame. The back support assembly may include (e.g., further include) a motion converter that operably couples the displaceable member to the back support mounting frame. The motion converter may be configured to convert an input motion applied to the motion converter relative to the back support mounting frame into an output motion that displaces the displaceable member relative to the back support mounting frame and along the primary axis of movement. The main movement axis may extend through the back support mounting frame in the thickness direction of the back support mounting frame. The back support assembly may include (e.g., further include) a linkage for coupling the one or more back support members to the displaceable member, the linkage being operably engaged with the displaceable member so as to be movable relative to the displaceable member along a secondary axis of movement that is non-parallel to the primary axis of movement. According to various embodiments, a seat may be provided. The seat may include a backrest and a back support assembly mounted to the backrest. Drawings In the drawings, like reference numerals generally designate like parts throughout the different views. The drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention. In the following description, various embodiments are described with reference to the following drawings. FIG. 1A illustrates a schematic view of a back support assembly for a backrest of a seat in accordance with various embodiments; FIG. 1B illustrates a schematic view of the back support assembly of FIG. 1A with the displaceable member displaced along the primary axis of movement, in accordance with various embodiments; FIG. 2A illustrates a perspective view of a seat having a back support assembly and a head support assembly according to various embodiments; FIG. 2B illustrates a close-up view of the back support assembly of FIG. 2A, according to various embodiments; FIG. 2C illustrates a front perspective exploded view of the back support assembly of FIG. 2A, according to various embodiments; FIG. 2D illustrates a rear perspective exploded view of the back support assembly of FIG. 2C, according to various embodiments; FIG. 2E illustrates a cross-sectional view of the back support assembly of FIG. 2C, in accordance with various embodiments; FIG. 2F depicts rotating the input receiving member to displace the displaceable member of the back support assembly along the primary axis of movement in accordance with various embodiments; FIG. 2G illustrates a cross-sectional close-up view of a knob of the back support assembly according to various embodiments; FIG. 2H illustrates an isolated side view of a threaded shaft having a knob according to various embodiments; FIG. 2I illustrates a front view of FIG. 2H, in accordance with various embodiments; FIG. 2J illustrates a partial cross-sectional view of a back support assembly according to various embodiments; FIGS. 2K-2M illustrate the back support member of the pair of back support members pivoted to different positions relative to the linkage arrangement of