Waist rest adjusting mechanism and seat

Abstract

The waist rest adjusting mechanism comprises a back supporting piece, a waist rest assembly and an adjusting control assembly, the waist rest assembly comprises a waist rest support and a waist rest supporting piece connected to the front side of the waist rest support, and the waist rest support is hinged to the back supporting piece so that the waist rest assembly can rotate front and back relative to the back supporting piece; the adjusting control assembly is arranged between the waist rest support and the back supporting piece and can act on the waist rest assembly. When the chair back is subjected to backward leaning force, the adjusting control assembly can control the waist leaning assembly to rotate front and back, and a waist chasing support is formed for the waist forming an angle with the chair back, so that the waist of a seated person is protected, and the use experience feeling of the seat is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a lumbar support adjusting mechanism and a seat furniture. Background Art

[0002] Most office chairs are provided with a lumbar support member at the lower end of the backrest that can support the waist. The lumbar support member can be an integral structure or a split structure. However, in order to fit the concave curve of the human lumbar and back, the lumbar support member usually protrudes forward to support the waist, so that the waist of office workers will not be overly fatigued.

[0003] However, this kind of lumbar support cannot always support the waist according to the needs of the user. For example, when the user is sitting normally, the body is in an upright state, and at this time, the lumbar support member can normally support the waist to ensure the correct sitting posture of the user. When the user is reclining and resting, the user will lean back on the backrest, and the backrest will also rotate backward to support the back. However, due to the position difference between the center point of the backward rotation of the human waist and the center point of the backward rotation of the backrest, the waist is separated from the lumbar support member and forms an angle. At this time, it is difficult for the lumbar support member to support the waist in the reclining state again. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a lumbar support adjusting mechanism. By arranging an adjustment control component between the already hinged lumbar support bracket and the back support member, the lumbar support component can rotate forward and backward and stop at the corresponding position, so as to form a fitting support for the waist.

[0005] Furthermore, a seat furniture is provided. By arranging the lumbar support adjusting mechanism on the seat furniture, when the backrest receives a backward leaning force, the adjustment control component can control the forward and backward rotation of the lumbar support component, and form a chasing waist support for the waist at an angle with the backrest, protecting the waist of the sitter and improving the use experience of the seat furniture.

[0006] The technical solution of the utility model is realized as follows:

[0007] A lumbar support adjusting mechanism, comprising:

[0008] A back support member, which is the support member of the lumbar support adjusting mechanism;

[0009] A lumbar support component, including a lumbar support bracket and a lumbar support member connected to the front side of the lumbar support bracket. The lumbar support bracket is hinged to the back support member, so that the lumbar support component can rotate forward and backward relative to the back support member;

[0010] An adjustment control component, arranged between the lumbar support bracket and the back support member. The adjustment control component can act on the lumbar support component to make the lumbar support component rotate in the front-back direction and stay at the corresponding position.

[0011] Preferably, the adjustment control assembly includes a sliding member that can slide left and right, and the sliding member is connected to a power output member that drives the sliding member to slide left and right; a transmission structure that can link the lumbar support bracket to rotate forward and backward is provided between the sliding member and the lumbar support bracket;

[0012] The power output member can drive the sliding member to slide left and right and trigger the transmission structure at the same time, so that the lumbar support component rotates along the front and back direction and stays at the corresponding position.

[0013] Preferably, the transmission structure is a slide groove and slide rod structure; the upper end of the lumbar support bracket is provided with a horizontal wall surface, the slide groove is an oblique transmission groove opened on the horizontal wall surface, and the oblique transmission groove extends obliquely along the front-to-back direction; the slide rod is an insertion rod arranged on the sliding member; the insertion rod is slidably connected in the oblique transmission groove; when the sliding member slides left and right, it can drive the insertion rod to slide in the oblique transmission groove, thereby causing the lumbar support assembly to rotate along the front-to-back direction and stay in the corresponding position; the oblique transmission slide groove and slide rod structure can convert the horizontal sliding of the sliding member into the front-to-back rotation process of the lumbar support bracket, and the design is simple and ingenious.

[0014] Preferably, at least two oblique transmission grooves spaced apart from each other are provided on the horizontal wall surface, and the number of the insertion rods corresponds to the number of the oblique transmission grooves. The multiple slide groove and slide rod structures can make the lumbar support assembly swing forward and backward more stably.

[0015] Preferably, a spiral hole is provided on the sliding member, and the axial direction of the spiral hole is the same as the sliding direction of the sliding member; the power output member is a spiral rod spirally fitted in the spiral hole, and a handle is connected to the end of the spiral rod away from the sliding member, and the handle drives the spiral rod to rotate in place under the action of external force, thereby driving the sliding member to slide in the left and right directions; the spiral fitting method is self-locking, and after the lumbar support bracket rotates back and forth to the corresponding position, the sliding member will not affect the spiral rod to rotate, so that the lumbar support member can stably support the back.

[0016] Preferably, the spiral rod includes an outer spiral sleeve and a rotating rod spirally fitted in the spiral hole, and the handle is connected to the outer end of the rotating rod; the outer spiral sleeve includes a socket located inside itself, and the rotating rod is inserted into the socket; the split plug-in structure of the spiral rod is simple and easy to install, which can improve assembly efficiency.

[0017] Preferably, the cross-sectional shape of the insertion hole is polygonal or cross-shaped, and the cross-sectional shape of the rotating rod matches the cross-sectional shape of the insertion hole.

[0018] Preferably, the inclination angle of the oblique transmission groove on the horizontal wall surface is 45°.

[0019] Preferably, the back support member is provided with a through groove that communicates vertically. The through groove corresponds to the horizontal wall surface in position, and the sliding member is located within the through groove. The through groove includes a starting end and a terminating end that face each other left and right. The power output member can drive the sliding member to slide between the starting end and the terminating end, thereby causing the lumbar support bracket to rotate in the front-rear direction and stay at the corresponding position. The through groove is a sliding guide groove for the sliding member and also limits the sliding range of the sliding member, so that the angle of the lumbar support assembly rotating back and forth is within a reasonable range.

[0020] Preferably, the lumbar support bracket is provided with a protrusion that extends upward beyond the horizontal wall surface. The rotating rod inserted into the insertion hole is simultaneously disposed between the protrusion and the back support member, so that the lumbar support bracket is hinged to the back support member. The rotating rod provides a rotating support for the lumbar support bracket and the back support member, eliminating the need to insert a rotating shaft between the lumbar support bracket and the back support member.

[0021] Preferably, the adjustment control assembly is a telescopic rod. The telescopic rod includes a fixed rod and a movable rod that are sleeved with each other. The fixed rod and the movable rod are respectively connected to the back support member and the lumbar support bracket. A gear control mechanism is provided between the fixed rod and the movable rod. The gear control mechanism includes a plurality of gear holes arranged along the length direction of the fixed rod. A concave hole is provided on the rod body of the movable rod, and an elastically telescopic limit ball is provided in the concave hole. Under the action of an external force, the movable rod is driven to expand and contract, and the limit ball can switch between the corresponding gear holes while elastically expanding and contracting, thereby causing the lumbar support assembly to rotate in the front-rear direction and stay at the corresponding position.

[0022] Furthermore, a seat is provided, including the lumbar support adjustment mechanism described above.

[0023] The beneficial effects of the present invention adopting the above technical solutions are as follows:

[0024] 1. When the sitter leans backward and causes the backrest to rotate backward, an angle is formed between the waist and the backrest. At this time, the lumbar support bracket can be actuated through the adjustment control assembly, so that the lumbar support assembly rotates back and forth to the position where it fits the waist, ensuring that when the sitter leans backward, the lumbar support member can form a conforming support for the waist shape, avoiding the phenomenon of the waist slipping, protecting the sitter's waist, and improving the use experience of the seat.

[0025] 2. The sliding member slides left and right in a spiral drive manner, with a simple and efficient structure. At the same time, when the lumbar support assembly rotates back and forth to the corresponding position, the spiral rod can lock the sliding member, preventing the lumbar support member from rotating backward when subjected to a leaning force and ensuring the support stability of the lumbar support member.

[0026] 3. The rotating rod is a transmission rod that drives the outer spiral sleeve to rotate and is also the rotating support shaft of the lumbar support bracket and the back support member, eliminating the need to insert another rotating shaft between the lumbar support bracket and the back support member, saving costs and simplifying the structure, achieving two goals with one action. Description of the Drawings

[0027] Figure 1 Schematic diagram of the lumbar support assembly in the rear position;

[0028] Figure 2 Schematic diagram of the forward swing of the lumbar support assembly;

[0029] Figure 3 Schematic structural diagram of the lumbar support adjustment mechanism provided on the backrest bracket;

[0030] Figure 4 Enlarged view of the adjustment control component;

[0031] Figure 5 Exploded view of the lumbar support adjustment mechanism;

[0032] Figure 6 Enlarged view of the rotating rod passing between the lumbar support bracket and the backrest support member;

[0033] Figure 7 Cross-sectional view of the lumbar support adjustment mechanism;

[0034] Figure 8 Enlarged view of the adjustment control component in Embodiment 2;

[0035] Each reference numeral is: 1 - backrest support member, 2 - lumbar support assembly, 3 - adjustment control component, 4 - backrest bracket, 5 - telescopic rod, 11 - through groove, 11a - starting end, 11b - terminating end, 21 - lumbar support bracket, 21a - protruding portion, 22 - lumbar support member, 31 - sliding member, 32 - outer spiral sleeve, 33 - rotating rod, 34 - handle, 51 - fixed rod, 52 - movable rod, 53 - gear hole, 54 - concave hole, 55 - limit ball, 56 - compression spring, 211 - oblique transmission groove, 211a - horizontal wall surface, 311 - insertion rod, 312 - spiral hole, 321 - insertion hole. Detailed implementation manners

[0036] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0037] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0038] The present invention has multiple embodiments, and the specific implementation manners are as follows:

[0039] Embodiment 1: As Figure 1-7As shown, the utility model provides a lumbar support adjustment mechanism, comprising:

[0040] Back support member 1, which is a support member of the lumbar support adjustment mechanism;

[0041] The lumbar support assembly 2 includes a lumbar support bracket 21 and a lumbar support member 22 connected to the front side of the lumbar support bracket 21. The lumbar support member 22 is a support plate symmetrically arranged on the front side of the lumbar support bracket 21. The lumbar support bracket 21 is hinged to the back support member 1, so that the lumbar support assembly 2 can rotate forward and backward relative to the back support member 1.

[0042] The adjustment control component 3 is arranged between the lumbar support bracket 21 and the back support member 1. The setting position of the adjustment control component 3 is staggered with the hinge position between the lumbar support bracket 21 and the back support member 1, and can be located above or below the hinge position. In this embodiment, the upper end position of the lumbar support bracket 21 is hinged to the back support member 1, and the adjustment control component 3 is arranged below the hinge position; the adjustment control component 3 can act on the lumbar support component 2, so that the lumbar support component 2 rotates along the front and rear directions and stays at the corresponding position.

[0043] Furthermore, the adjustment control assembly 3 acts on the lumbar support bracket 21 as follows: the adjustment control assembly 3 includes a sliding member 31 that can slide left and right, and a power output member that drives the sliding member 31 to slide left and right is connected to the sliding member 31; a transmission structure that can link the lumbar support bracket 21 to rotate forward and backward is provided between the sliding member 31 and the lumbar support bracket 21; the power output member can drive the sliding member 31 to slide left and right and trigger the transmission structure at the same time, so that the lumbar support assembly 2 rotates in the forward and backward direction and stays at the corresponding position; specifically, the transmission structure is a slide slot and slide rod structure; the upper end of the lumbar support bracket 21 has a horizontal wall 211a, the slide groove is an oblique transmission groove 211 opened on the horizontal wall 211a, and the oblique transmission groove 211 extends obliquely along the front-to-back direction; the slide rod is an insertion rod 311 set on the sliding member 31; the insertion rod 311 is slidably connected in the oblique transmission groove 211; when the sliding member 31 slides left and right, it can drive the insertion rod 311 to slide in the oblique transmission groove 211, so that the lumbar support component 2 rotates along the front-to-back direction and stays at the corresponding position, and the oblique transmission slide groove slide rod structure can convert the horizontal sliding of the sliding member 31 into the front-to-back rotation process of the lumbar support bracket 21, and the design is simple and ingenious.

[0044] Furthermore, in order to make the force acting on the lumbar support bracket 21 uniform and stable, at least two oblique transmission grooves 211 spaced apart from each other are opened on the horizontal wall 211a, and the number of the insertion rods 311 corresponds to the number of the oblique transmission grooves 211. The multiple sliding groove and sliding rod structures can form multiple sliding action points, which can make the lumbar support assembly 2 swing back and forth more stably.

[0045] Furthermore, after the lumbar support member 22 rotates forward and backward to the corresponding position, it should maintain stable support for the back without moving backward. Therefore, the sliding member 31 is driven to slide left and right in a spiral drive manner. Specifically, a spiral hole 312 is formed in the sliding member 31, and the axial direction of the spiral hole 312 is the same as the sliding direction of the sliding member 31; the power output member is a screw rod spirally fitted in the spiral hole 312. One end of the screw rod away from the sliding member 31 is connected with a handle 34. The handle 34 drives the screw rod to rotate in place under the action of an external force, and then drives the sliding member 31 to slide in the left and right directions; the spiral fitting method has self-locking property. After the lumbar support bracket 21 rotates forward and backward to the corresponding position, the sliding member 31 will not cause the screw rod to rotate, so that the lumbar support member 22 can stably support the back.

[0046] Furthermore, for the convenience of installation, the screw rod includes an external spiral sleeve 32 spirally fitted in the spiral hole 312 and a rotating rod 33. The handle 34 is connected to the outer end of the rotating rod 33; the external spiral sleeve 32 includes an insertion hole 321 inside itself, and the rotating rod 33 is inserted into the insertion hole 321; the split plug-in structure of the screw rod is simple and easy to install, which can improve the assembly efficiency.

[0047] Furthermore, the shapes of the plug blocks 321 for realizing transmission are diverse. In this embodiment, the cross-sectional shape of the insertion hole 321 is polygonal or cross-shaped, and the cross-sectional shape of the rotating rod 33 matches the cross-sectional shape of the insertion hole 321.

[0048] Furthermore, the driving force and the sliding stroke received by the sliding member 31 during left and right sliding should be within a reasonable range. Therefore, in this embodiment, the inclination angle of the oblique transmission groove 211 on the horizontal wall surface 211a is 45°;

[0049] The inclination angle of 45° can make the driving force received by the sliding member 31 within a reasonable range, and make the acting force received by the lumbar support bracket 11 during forward and backward swinging uniform and stable.

[0050] Furthermore, a through groove 11 communicating up and down is provided on the back support member 1. The through groove 11 is a sliding guide groove for the sliding member 31. The through groove 11 corresponds to the horizontal wall surface 211a, and the sliding member 31 is located in the through groove 11; the through groove 11 includes a starting end 11a and a terminating end 11b opposite to each other left and right. The power output member can drive the sliding member 31 to slide between the starting end 11a and the terminating end 11b, and then make the lumbar support bracket 21 rotate in the front and back directions and stay at the corresponding position; the starting end 11a and the terminating end 11b also limit the sliding range of the sliding member 31, so that the rotation angle of the lumbar support assembly 2 in the front and back directions is within a reasonable range.

[0051] Furthermore, the rotating rod 33 also serves as a rotating support; specifically, the lumbar support bracket 21 is provided with a protruding portion 21a that extends upward beyond the horizontal wall surface 211a. The protruding portions 21a are symmetrically arranged on the left and right sides of the horizontal wall surface 211a. The rotating rod 33 inserted into the jack 321 is also passed through between the protruding portion 21a and the back support member 1, so that the lumbar support bracket 21 is hinged to the back support member 1; the rotating rod 33 provides a rotating support for the lumbar support bracket 21 and the back support member 1, eliminating the need to pass a rotating shaft between the lumbar support bracket 21 and the back support member 1.

[0052] Furthermore, a seat is provided, including the lumbar support adjustment mechanism. The seat includes a back bracket 4. The back support member 1 in the lumbar support adjustment mechanism is arranged on the front side of the back bracket 4. The back bracket 4 is rotatably connected to the rear end of the seat. When the sitter reclines and the backrest rotates backward, an angle is formed between the waist and the backrest. By adjusting the control component 3 to act on the lumbar support bracket 21, it is ensured that when the sitter reclines, the lumbar support member 22 can provide a conforming support for the lumbar shape, avoiding the phenomenon of the waist slipping, and improving the use experience of the seat.

[0053] Embodiment 2: As Figure 8 shown, the difference between this embodiment and the above embodiment is that the adjustment control component is a telescopic rod 5. The telescopic rod 5 includes a fixed rod 51 and a movable rod 52 that are sleeved with each other. The fixed rod 51 and the movable rod 52 are respectively connected to the back support member 1 and the lumbar support bracket 21; a gear control mechanism is provided between the fixed rod 51 and the movable rod 52. The gear control mechanism includes a plurality of gear holes 53 arranged along the length direction of the fixed rod 51. A concave hole 54 is provided on the rod body of the movable rod 52. An elastically telescopic limit ball 55 is provided in the concave hole 54. A compression spring 56 that provides an elastic telescopic force for the limit ball 55 is provided between the limit ball 55 and the bottom of the concave hole 54. Driven by an external force to drive the movable rod 52 to expand and contract, the limit ball 55 can switch between the corresponding gear holes 53 while elastically expanding and contracting, and further rotate the lumbar support assembly 2 in the front-rear direction and stay at the corresponding position to achieve the same adjustment control effect as in the above embodiment.

[0054] The above schematically describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the creative purpose of the present invention, design similar structural manners and embodiments to this technical solution without creative efforts, they should all fall within the protection scope of the present invention.

Claims

1. A lumbar support adjusting mechanism, characterized in that, Comprising: A back support member (1), which is a support member of the lumbar support adjustment mechanism; A lumbar support assembly (2), including a lumbar support bracket (21) and a lumbar support member (22) connected to the front side of the lumbar support bracket (21). The lumbar support bracket (21) is hinged to the back support member (1), enabling the lumbar support assembly (2) to rotate back and forth relative to the back support member (1); An adjustment control assembly (3), disposed between the lumbar support bracket (21) and the back support member (1). The adjustment control assembly (3) can act on the lumbar support assembly (2) to cause the lumbar support assembly (2) to rotate in the front - back direction and stay at the corresponding position.

2. The lumbar support adjusting mechanism according to claim 1, characterized in that: The adjustment control assembly (3) includes a sliding member (31) that can slide left - right. A power output member for driving the sliding member (31) to slide left - right is connected to the sliding member (31). A transmission structure for linking the front - back rotation of the lumbar support bracket (21) is provided between the sliding member (31) and the lumbar support bracket (21); The power output member can trigger the transmission structure while driving the sliding member (31) to slide left - right, causing the lumbar support assembly (2) to rotate in the front - back direction and stay at the corresponding position.

3. The lumbar support adjusting mechanism according to claim 2, characterized in that: The transmission structure is a chute - slide bar structure. The upper end of the lumbar support bracket (21) has a horizontal wall surface (211a). The chute is an inclined transmission groove (211) opened on the horizontal wall surface (211a), and the inclined transmission groove (211) extends obliquely in the front - back direction. The slide bar is a plug rod (311) provided on the sliding member (31). The plug rod (311) is slidably connected in the inclined transmission groove (211). When the sliding member (31) slides left - right, it can drive the plug rod (311) to slide in the inclined transmission groove (211), thereby causing the lumbar support assembly (2) to rotate in the front - back direction and stay at the corresponding position.

4. The lumbar support adjusting mechanism according to claim 3, characterized in that: At least two inclined transmission grooves (211) spaced left - right are opened on the horizontal wall surface (211a), and the number of plug rods (311) corresponds to the number of inclined transmission grooves (211).

5. The lumbar support adjusting mechanism according to claim 3, characterized in that: A spiral hole (312) is opened on the sliding member (31), and the axial direction of the spiral hole (312) is the same as the sliding direction of the sliding member (31). The power output member is a screw rod that is spirally engaged in the spiral hole (312). One end of the screw rod away from the sliding member (31) is connected with a handle (34). The handle (34) drives the screw rod to rotate in place under the action of an external force, and then drives the sliding member (31) to slide in the left - right direction.

6. The lumbar support adjusting mechanism according to claim 5, characterized in that: The screw rod includes an outer spiral sleeve (32) spirally engaged in the spiral hole (312) and a rotating rod (33). The handle (34) is connected to the outer end of the rotating rod (33). The outer spiral sleeve (32) includes a jack (321) inside itself, and the rotating rod (33) is inserted into the jack (321).

7. The lumbar support adjusting mechanism according to claim 6, characterized in that: The cross - sectional shape of the jack (321) is polygonal or cross - shaped, and the cross - sectional shape of the rotating rod (33) matches the cross - sectional shape of the jack (321).

8. The lumbar support adjusting mechanism according to claim 3, characterized in that: The inclination angle of the inclined transmission groove (211) on the horizontal wall surface (211a) is 45°.

9. The lumbar support adjusting mechanism according to claim 2, characterized in that: The back support member (1) is provided with a through groove (11) that is vertically communicated. The through groove (11) corresponds to the horizontal wall surface (211a) in position, and the sliding member (31) is located within the through groove (11). The through groove (11) includes a starting end (11a) and a terminating end (11b) that are opposite to each other left and right. The power output member can drive the sliding member (31) to slide between the starting end (11a) and the terminating end (11b), thereby enabling the lumbar support bracket (21) to rotate in the front-rear direction and stay at the corresponding position.

10. A lumbar support adjusting mechanism according to claim 6, characterized in that: The lumbar support bracket (21) is provided with a protrusion (21a) that extends upward beyond the horizontal wall surface (211a). The rotating rod (33) inserted into the insertion hole (321) is simultaneously disposed between the protrusion (21a) and the back support member (1), so that the lumbar support bracket (21) is hinged to the back support member (1).

11. The lumbar support adjusting mechanism according to claim 1, wherein: The adjustment control assembly is a telescopic rod (5). The telescopic rod (5) includes a fixed rod (51) and a movable rod (52) that are sleeved with each other. The fixed rod (51) and the movable rod (52) are respectively connected to the back support member (1) and the lumbar support bracket (21). A gear control mechanism is provided between the fixed rod (51) and the movable rod (52). The gear control mechanism includes a plurality of gear holes (53) arranged along the length direction of the fixed rod (51). A concave hole (54) is provided on the rod body of the movable rod (52). An elastically telescopic limit ball (55) is provided in the concave hole (54). When driven by an external force to cause the movable rod (52) to expand and contract, the limit ball (55) can switch between the corresponding gear holes (53) while elastically expanding and contracting, thereby enabling the lumbar support assembly (2) to rotate in the front-rear direction and stay at the corresponding position.

12. A seat, characterized in that, It includes the lumbar support adjustment mechanism according to Claim 1.

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