Screw rod and connecting rod transmission type backrest lumbar support linkage lifting mechanism and seat

Abstract

The present invention belongs to the field of furniture, and specifically relates to a screw-connecting rod transmission type backrest lumbar support linkage lifting mechanism and a seat, comprising a lumbar support mounting member, a first backrest mounting member, a second backrest mounting member and a lifting assembly, wherein the lumbar support mounting member is used to mount a lumbar support, the first backrest mounting member is used to mount a first backrest, the second backrest mounting member is used to mount a second backrest, and the lifting assembly is used to drive the lumbar support mounting member, the first backrest mounting member and the second backrest mounting member to lift and lower simultaneously. The present invention can realize the linkage lifting and lowering of the lumbar support and the backrest, and can expand the overall use area of ​​the chair back during lifting and lowering, so that the seat can match people of different heights and body shapes.

Description

Technical Field

[0001] The invention belongs to the field of furniture, and in particular relates to a screw-connecting-rod transmission type backrest and lumbar support linkage lifting mechanism and a seat. Background Art

[0002] Chairs are common furniture in daily life. Since office and study chairs are used in special occasions and users need to sit for a long time, the backrest module of office and study chairs usually needs to include a backrest and a lumbar support to provide users with a comfortable experience. However, the backrest and lumbar support in traditional office and study chairs are generally fixed structures and cannot be adjusted in height, which cannot meet the needs of people of different body shapes at the same time.

[0003] Patent CN2827141Y discloses an ergonomic chair that can maintain the physiological curvature of the spine and prevent and treat low back pain and cervical spondylosis. It is called a spine-soothing chair. From bottom to top, it consists of a seat, a seat surface and a chair back. Its seat surface is relatively short, and a depression called the ischial tuberosity fossa is set on the upper surface of the seat surface to prevent the ischial tuberosity from sliding forward; the chair back is columnar, and there are lumbar support, chest support and neck support from bottom to top in front of the chair back, and they are movably connected to the chair back with the help of lumbar support handle, chest support handle and neck support handle. The connection method can be a U-shaped plug rod or a clamping tooth or a rib, and can also be adjusted by a motor. The lumbar support located at the lumbar level in the middle of the front of the chair back can prevent the pelvis from tilting backward and maintain the lumbar curvature of the spine in a personalized way. The chest support located at the level of the thoracic spine can maintain a normal thoracic curvature and prevent hunchback. The C-shaped neck support located above the chair back is used to maintain the physiological curvature of the cervical spine; the C-shaped support embraces the top, and when the position is raised, it can produce the effect of cervical traction.

[0004] The above-mentioned spine-relaxing chair has the following problems:

[0005] 1) When the backrest and lumbar support require different heights, they can only be operated separately. The heights of the backrest and lumbar support cannot be adjusted at the same time.

[0006] 2) The area of ​​the overall structure of the backrest is fixed and cannot be adjusted. Summary of the invention

[0007] In order to make up for the deficiencies of the prior art, the present invention provides a technical solution of a screw-connecting rod transmission type backrest and lumbar support linkage lifting mechanism and a seat.

[0008] The present invention provides a screw-connecting rod transmission type backrest lumbar support linkage lifting mechanism, comprising:

[0009] A waist support mounting piece, the waist support mounting piece is used to mount a waist support;

[0010] A first backrest mounting member, wherein the first backrest mounting member is used to mount a first backrest;

[0011] A second backrest mounting member, the second backrest mounting member is used to mount a second backrest, the first backrest mounting member and the second backrest mounting member are arranged opposite to each other on the left and right, and the lumbar support mounting member is located at the lower end of the first backrest mounting member and the second backrest mounting member; and

[0012] A lifting component is used to drive the lumbar support mounting component, the first backrest mounting component and the second backrest mounting component to rise and fall simultaneously.

[0013] It can be understood that the above technical solution can realize the linkage lifting of the lumbar support and the backrest by driving the lumbar support mounting part, the first backrest mounting part and the second backrest mounting part to lift and lower simultaneously through the lifting component.

[0014] The moving track of the first backrest mounting member is tilted, and the moving track of the second backrest mounting member is tilted, and the moving tracks of the two form an inverted figure eight structure.

[0015] It can be understood that the above technical solution sets the moving tracks of the first backrest mounting member and the second backrest mounting member into an eight-shaped structure, so that the rising time distance between the two becomes larger, thereby achieving the purpose of expanding the overall use area of ​​the chair back.

[0016] Furthermore, the lifting mechanism also includes two first and second connecting rod units arranged opposite to each other on the left and right sides, the first connecting rod unit is respectively connected to the lumbar support mounting member and the first backrest mounting member, and the second connecting rod unit is respectively connected to the lumbar support mounting member and the second backrest mounting member.

[0017] It can be understood that the first connecting rod unit and the second connecting rod unit, as transmission components, can transmit the force of the lifting assembly to the lumbar support mounting component, the first backrest mounting component and the second backrest mounting component, thereby realizing the linkage lifting of the three.

[0018] Furthermore, when the lumbar support mounting member, the first backrest mounting member and the second backrest mounting member are lifted and lowered simultaneously, in the vertical direction, the first connecting rod unit and the second connecting rod unit can fold and unfold to make the movement speed of the lumbar support mounting member smaller than the movement speeds of the first backrest mounting member and the second backrest mounting member.

[0019] It can be understood that when the connecting rod unit is folded and unfolded, its overall length in the vertical direction will change, and the distance between the lumbar support mounting part and the backrest mounting part will naturally change. The present invention uses this principle to increase the distance between the lumbar support mounting part and the backrest mounting part when the lumbar support mounting part and the backrest mounting part rise at the same time, thereby expanding the overall usable area of ​​the chair back.

[0020] Furthermore, the lifting assembly includes a lifting transmission member that can move up and down and lock its position. When the lifting transmission member moves up and down, it can simultaneously drive the lumbar support mounting member, the first backrest mounting member and the second backrest mounting member to move through the first connecting rod unit and the second connecting rod unit.

[0021] It can be understood that the lifting transmission member is linked to the connecting rod unit through lifting, and the connecting rod unit is further linked to the lumbar support mounting member, the first backrest mounting member and the second backrest mounting member, thereby realizing the simultaneous movement of the lumbar support mounting member, the first backrest mounting member and the second backrest mounting member.

[0022] Furthermore, the first link unit and the second link unit are collectively referred to as a link unit, and the link unit includes a first link, a second link and a third link. The lifting transmission member is used to drive the first link to move, the first link is used to drive the second link to move, the second link is used to drive the lumbar support mounting member to move while driving the third link to move, and the third link is used to drive the corresponding backrest mounting member to move.

[0023] It can be understood that the above three connecting rods perform their respective functions and have a compact and simple structure. The first connecting rod serves as the main power input component, and the second connecting rod and the third connecting rod serve as power output components, which are respectively used to drive the lumbar support mounting component and the corresponding backrest mounting component to move, and the second connecting rod and the third connecting rod constitute the main body of the folding and unfolding structure of the connecting rod unit.

[0024] Furthermore, one end of the first connecting rod is rotatably connected to the lifting transmission member, and the other end is rotatably connected to the second connecting rod. One end of the second connecting rod is rotatably connected to the lumbar support mounting member, and the other end is rotatably connected to the third connecting rod. The third connecting rod is rotatably connected to the corresponding backrest mounting member.

[0025] It can be understood that the first connecting rod, the second connecting rod and the third connecting rod are connected in this way, and the structure is the simplest and most effective.

[0026] Furthermore, the lifting mechanism also includes a fixed seat, and the upper end of the second connecting rod is slidably connected to the fixed seat.

[0027] It can be understood that providing guidance for the second connecting rod through the fixing seat can make the connecting rod unit run more stably.

[0028] Furthermore, the lifting assembly also includes a screw rod and a driving unit. The screw rod is threadedly engaged with the lifting transmission member, and the driving unit is used to drive the screw rod to rotate.

[0029] It can be understood that the method of driving the lifting transmission member to move up and down by means of a screw rod is simple and effective, and can be self-locking.

[0030] Furthermore, the lifting mechanism also includes a base, and the lumbar support mounting member, the first backrest mounting member and the second backrest mounting member are respectively slidably connected to the base.

[0031] It can be understood that such an arrangement can make the movement of the lumbar support mounting member, the first backrest mounting member and the second backrest mounting member more stable.

[0032] Furthermore, the lifting assembly includes a screw rod and a driving unit. The screw rod is threadedly connected with the lumbar support mounting piece. The driving unit is used to drive the screw rod to rotate. The lifting assembly is used to drive the lumbar support mounting piece to move up and down. The lumbar support mounting piece drives the first backrest mounting piece to move up and down through the first connecting rod unit. The lumbar support mounting piece drives the second backrest mounting piece to move through the second connecting rod unit.

[0033] It can be understood that the method of driving the lumbar support mounting member to move up and down by means of a screw rod is simple and effective, and can be self-locking.

[0034] Furthermore, the first link unit and the second link unit are collectively referred to as a link unit, the link unit includes a fourth link and a fifth link, the lumbar support mounting member is used to drive the fourth link to move, the fourth link is used to drive the fifth link to move, and the fifth link is used to drive the corresponding backrest mounting member to move.

[0035] It can be understood that the connecting rod unit structure in this technical solution is simpler.

[0036] Furthermore, the lifting mechanism also includes a base, one end of the fourth connecting rod is rotatably connected to the base, and the other end is rotatably connected to the fifth connecting rod, the fifth connecting rod is rotatably connected to the corresponding backrest mounting member, and the lumbar support mounting member is rotatably connected to the fourth connecting rod; the first backrest mounting member and the second backrest mounting member are respectively slidably connected to the base.

[0037] It can be understood that the fourth connecting rod and the fifth connecting rod are connected in this way, and the structure is the simplest and most effective. In addition, the first backrest mounting member and the second backrest mounting member are arranged to be slidably connected to the base respectively, so that the first backrest mounting member and the second backrest mounting member can move more stably.

[0038] Furthermore, the driving unit includes a gear box and a power source, the gear box is used to drive the screw to rotate, and the power source is used to drive the gear box to move, and the power source is a manual driving structure or an electric driving structure.

[0039] It can be understood that the gearbox is mainly used to change the direction of power transmission, and the power source can adopt a manual drive structure or an electric drive structure according to actual needs.

[0040] Compared with the prior art, the beneficial effects of the screw-connecting rod transmission type backrest lumbar support linkage lifting mechanism provided by the present invention include:

[0041] 1) The backrest and lumbar support can be raised and lowered through the screw rod and connecting rod unit, which makes the operation more labor-saving;

[0042] 2) The screw rod is used for lifting and locking, which realizes the stepless lifting of the backrest and lumbar support, with higher precision and more accurate positioning, which fits the different heights of children;

[0043] 3) The backrest and lumbar support are linked, and the backrest and lumbar support can be adjusted at the same time in one step, which is more convenient to operate;

[0044] 4) The backrest and lumbar support achieve a speed difference through the connecting rod unit. When the backrest and lumbar support are raised and lowered at the same time, the relative distance between them will be automatically adjusted, and the left and right distance of the chair back will also be automatically adjusted to better fit the changing trend of the back and waist as the child grows.

[0045] A seat, wherein the seat back module comprises a lumbar support, a first backrest, a second backrest and the lifting mechanism as described above, wherein the lumbar support mounting piece of the lifting mechanism is connected with the lumbar support, the first backrest mounting piece of the lifting mechanism is connected with the first backrest, and the second backrest mounting piece of the lifting mechanism is connected with the second backrest.

[0046] The seat provided by the present invention includes the above-mentioned lifting mechanism. Since the specific structure, connection relationship and beneficial effects of the lifting mechanism have been described in detail in the above text, they will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is one of the structural schematic diagrams of Example 1 when it is connected with the lumbar support, the first backrest and the second backrest;

[0048] Figure 2 This is one of the structural diagrams of Example 1;

[0049] Figure 3 This is the second structural diagram of Example 1;

[0050] Figure 4 The second structural diagram of embodiment 1 when connected with the lumbar support, the first backrest and the second backrest;

[0051] Figure 5 The third structural diagram of the embodiment 1 when connected with the lumbar support, the first backrest and the second backrest;

[0052] Figure 6 This is a schematic diagram of the internal structure of Example 2 when it is connected with the lumbar support, the first backrest and the second backrest;

[0053] Figure 7 This is a schematic diagram of the internal structure of Example 2;

[0054] Figure 8 An exploded view of Example 2 when connected with the lumbar support, the first backrest and the second backrest;

[0055] Fig. 9 This is one of the structural schematic diagrams of Example 2 when connected with the lumbar support, the first backrest and the second backrest;

[0056] Fig.10This is one of the structural schematic diagrams of Example 2 when connected with the lumbar support, the first backrest and the second backrest;

[0057] Fig.11 This is a structural schematic diagram of Example 3;

[0058] Fig.12 This is a structural schematic diagram of Example 4. DETAILED DESCRIPTION

[0059] In the description of the present invention, it is necessary to understand that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0060] The present invention will be further described below in conjunction with the accompanying drawings. Example 1

[0061] See also Figure 1-5 The present embodiment provides a screw-connecting rod transmission type backrest lumbar support linkage lifting mechanism, comprising two lumbar support mounting parts 1, a first backrest mounting part 3, a second backrest mounting part 5 and a lifting assembly.

[0062] The two waist support mounting members 1 are arranged on the left and right to mount the waist support 2. A waist support mounting block 100 is fixedly connected to each waist support mounting member 1, and the moving track of the waist support mounting member 1 is arranged vertically.

[0063] The first backrest mounting member 3 is used to mount the first backrest 4 , and a first backrest mounting block 300 is fixedly connected thereto. The moving track of the first backrest mounting member 3 is inclined.

[0064] The second backrest mounting component 5 is used to mount the second backrest 6, and the second backrest mounting block 500 is fixedly connected thereto. The moving track of the second backrest mounting component 5 is tilted, and the first backrest mounting component 3 and the second backrest mounting component 5 are arranged opposite to each other on the left and right. The moving tracks of the two constitute an inverted eight-shaped structure, and the lumbar support mounting component is located at the lower ends of the two.

[0065] The lifting assembly is used to drive the lumbar support mounting member 1, the first backrest mounting member 3 and the second backrest mounting member 5 to rise and fall simultaneously.

[0066] The first backrest mounting member 3 and the second backrest mounting member 5 are collectively referred to as backrest mounting members; the first backrest 4 and the second backrest 6 are collectively referred to as backrests. The two lumbar support mounting members 1 can be fixed as one.

[0067] Continue reading Figure 2 The lifting mechanism further includes a first connecting rod unit and a second connecting rod unit which are arranged opposite to each other on the left and right sides. The first connecting rod unit is respectively connected with the lumbar support mounting member 1 and the first backrest mounting member 3, and the second connecting rod unit is respectively connected with the lumbar support mounting member 1 and the second backrest mounting member 5. When the lumbar support mounting member 1, the first backrest mounting member 3 and the second backrest mounting member 5 are lifted and lowered at the same time, in the vertical direction, the first connecting rod unit and the second connecting rod unit can make the moving speed of the lumbar support mounting member 1 smaller than the moving speed of the first backrest mounting member 3 and the second backrest mounting member 5 by folding and unfolding.

[0068] The first connecting rod unit and the second connecting rod unit are collectively referred to as connecting rod units, and the connecting rods therein are not limited to a rod-shaped structure, but may also be a plate-shaped structure, a block-shaped structure, etc.

[0069] Continue reading Figure 2 The lifting assembly includes a lifting transmission member 7, a screw rod 12 and a driving unit. The screw rod 12 is threadedly connected with the lifting transmission member 7. The driving unit is used to drive the screw rod 12 to rotate. The lifting transmission member 7 can move up and down and lock the position. When the lifting transmission member 7 moves up and down, it can simultaneously drive the lumbar support mounting member 1, the first backrest mounting member 3 and the second backrest mounting member 5 to move through the first connecting rod unit and the second connecting rod unit.

[0070] Among them, continue to refer to Figure 2 The driving unit includes a gear box 13 and a power source. The gear box 13 is used to drive the screw 12 to rotate, and the power source is used to drive the gear box 13 to move. The power source is preferably a rotary switch 17, which includes a knob and an input shaft. The input shaft is driven and plugged with the gear box 13. The gear box 13 can change the direction of power transmission, and the horizontal input force is output vertically. The structure of the gear box 13 can refer to Example 2. In addition, the power source can also be a motor.

[0071] In some embodiments, the lifting transmission member 7 can also be configured as a slider that can be moved up and down by dragging a handle. When locking is required, the slider is locked by tightening a knob bolt.

[0072] Continuing to refer to 2, the connecting rod unit includes a first connecting rod 8, a second connecting rod 9 and a third connecting rod 10. The lifting transmission member 7 is used to drive the first connecting rod 8 to move, the first connecting rod 8 is used to drive the second connecting rod 9 to move, the second connecting rod 9 is used to drive the lumbar support mounting member 1 to move while driving the third connecting rod 10 to move, and the third connecting rod 10 is used to drive the corresponding backrest mounting member to move. Specifically, one end of the first connecting rod 8 is rotatably connected to the lifting transmission member 7, and the other end is rotatably connected to the second connecting rod 9, one end of the second connecting rod 9 is rotatably connected to the lumbar support mounting member 1, and the other end is rotatably connected to the third connecting rod 10, and the third connecting rod 10 is rotatably connected to the corresponding backrest mounting member.

[0073] Continue reading Figure 2 The lifting mechanism further includes a fixed seat 11, and the upper end of the second connecting rod 9 is slidably connected to the fixed seat 11. Specifically, the fixed seat 11 is located at the upper end of the lifting transmission member 7, and inclined slide grooves 1100 are respectively provided on both sides thereof, and the second connecting rods 9 of the two connecting rod units are respectively slidably connected to the corresponding slide grooves 1100.

[0074] Continue reading Figure 2 The lifting mechanism further includes a base 14, the lumbar support mounting member 1, the first backrest mounting member 3 and the second backrest mounting member 5 are slidably connected to the base 14 respectively, and the fixed seat 11 is fixedly connected to the base 14. Specifically, a first slide rail 18, a second slide rail 19 and a third slide rail 20 are arranged on the base 14, the first slide rail 18 is slidably connected to the lumbar support mounting member 1, the second slide rail 19 is slidably connected to the first backrest mounting member 3, and the third slide rail 20 is slidably connected to the second backrest mounting member 5. The setting direction of the slide rail is the same as the setting direction of the moving track of the mounting member.

[0075] Ascending operation process:

[0076] The rotary switch 17 is turned, and the rotary switch 17 drives the gear box 13 to work, and the gear box 13 drives the screw rod 12 to rotate, and the screw rod 12 drives the lifting transmission member 7 to move upward, and the lifting transmission member 7 drives the lumbar support mounting member 1 and the backrest mounting member to move upward at the same time through two connecting rod units. In the upward movement process, since the movement trajectory of the first backrest mounting member 3 and the second backrest mounting member 5 forms an inverted eight-shaped structure, the distance between the two will increase. At the same time, the connecting rod unit will be expanded under the drive of the lifting transmission member 7, so that the overall length of the connecting rod unit in the vertical direction becomes larger, thereby increasing the distance between the lumbar support mounting member 1 and the corresponding backrest mounting member.

[0077] The advantages of this embodiment are:

[0078] (1) The backrest and lumbar support move along the slide rail, the lumbar support can move up and down, and the backrest can move diagonally to achieve size adjustment;

[0079] (2) The backrest and lumbar support can be synchronized under the action of the connecting rod unit;

[0080] (3) The slide can control the motion trajectory of the connecting rod unit and thus control the motion trajectory of the backrest and lumbar support;

[0081] (4) Using the change in angle when connecting rods of different lengths move, different moving speeds of the backrest and lumbar support can be achieved;

[0082] (5) The rotary switch realizes the reversing control screw transmission through the gear box;

[0083] (6) The adjustment speed and adjustment force can be controlled by changing the screw pitch;

[0084] (7) The lifting transmission part has a threaded hole that matches the screw rod, and the two realize coordinated transmission;

[0085] (9) The locking force of the screw rod is used to achieve positioning, and no displacement occurs during use. Example 2

[0086] See also Figure 6-10 The present embodiment provides a screw-connecting rod transmission backrest lumbar support linkage lifting mechanism, comprising a lumbar support mounting member 1, a first backrest mounting member 3, a second backrest mounting member 5 and a lifting assembly.

[0087] The waist support mounting member 1 is used to mount the waist support 2 , and a waist support mounting block 100 is fixedly connected to the waist support mounting member 1 , and the moving track of the waist support mounting member 1 is vertically arranged.

[0088] The first backrest mounting member 3 is used to mount the first backrest 4 , and a first backrest mounting block 300 is fixedly connected thereto. The moving track of the first backrest mounting member 3 is inclined.

[0089] The second backrest mounting component 5 is used to mount the second backrest 6, and the second backrest mounting block 500 is fixedly connected thereto. The moving track of the second backrest mounting component 5 is tilted, and the first backrest mounting component 3 and the second backrest mounting component 5 are arranged opposite to each other on the left and right. The moving tracks of the two constitute an inverted eight-shaped structure, and the lumbar support mounting component 1 is located below the two.

[0090] The lifting assembly is used to drive the lumbar support mounting member 1, the first backrest mounting member 3 and the second backrest mounting member 5 to rise and fall simultaneously.

[0091] The first backrest mounting member 3 and the second backrest mounting member 5 are collectively referred to as backrest mounting members; the first backrest 4 and the second backrest 6 are collectively referred to as backrests. The two lumbar support mounting members 1 can be fixed as one.

[0092] Continue reading Figure 7 The lifting mechanism further includes a first connecting rod unit and a second connecting rod unit which are arranged opposite to each other on the left and right sides. The first connecting rod unit is respectively connected with the lumbar support mounting member 1 and the first backrest mounting member 3, and the second connecting rod unit is respectively connected with the lumbar support mounting member 1 and the second backrest mounting member 5. When the lumbar support mounting member 1, the first backrest mounting member 3 and the second backrest mounting member 5 are lifted and lowered at the same time, in the vertical direction, the first connecting rod unit and the second connecting rod unit can make the moving speed of the lumbar support mounting member 1 smaller than the moving speed of the first backrest mounting member 3 and the second backrest mounting member 5 by folding and unfolding.

[0093] The first link unit and the second link unit are collectively referred to as link units, and the links are not limited to rod-shaped structures, but may also be plate-shaped structures, block-shaped structures, etc. In addition, the backrest mounting member is a tubular structure, and the main body of the link unit is located in the backrest mounting member.

[0094] Continue reading Figure 7 The lifting assembly includes a screw rod 12 and a driving unit. The screw rod 12 is threadedly connected with the lumbar support mounting member 1. The driving unit is used to drive the screw rod 12 to rotate. When the screw rod 12 rotates, it can drive the lumbar support mounting member 1 to move up and down. The lumbar support mounting member 1 drives the first backrest mounting member 3 to move up and down through the first connecting rod unit. The lumbar support mounting member 1 drives the second backrest mounting member 5 to move up and down through the second connecting rod unit.

[0095] Among them, continue to refer to Figure 8 The driving unit includes a gear box 13 and a power source. The gear box 13 is used to drive the screw 12 to rotate, and the power source is used to drive the gear box 13 to move. The power source is preferably a rotary switch 17, which includes a knob and an input shaft. The input shaft is mated with the gear box 13. The gear box 13 can change the direction of power transmission, and the horizontal input force is output vertically. In addition, the power source can also be a motor.

[0096] Further reading Figure 8 The gear box 13 has an input bevel gear 1300 disposed on the rotary switch 17 and an output bevel gear 1301 disposed on the screw rod 12 , and the input bevel gear 1300 is meshed with the output bevel gear 1301 .

[0097] Continue reading Figure 7 The connecting rod unit includes a fourth connecting rod 15 and a fifth connecting rod 16. The lumbar support mounting member 1 is used to drive the fourth connecting rod 15 to move, the fourth connecting rod 15 is used to drive the fifth connecting rod 16 to move, and the fifth connecting rod 16 is used to drive the corresponding backrest mounting member to move.

[0098] Specifically, one end of the fourth connecting rod 15 is rotatably connected to the lumbar support mounting member 1, and the other end is rotatably connected to the fifth connecting rod 16, and the fifth connecting rod 16 is rotatably connected to the corresponding backrest mounting member.

[0099] Continue reading Figure 7 and Figure 8 The lifting assembly further includes a base 14, and the first backrest mounting member 3 and the second backrest mounting member 5 are respectively slidably connected to the base 14. Specifically, the base 14 is a separate cover structure, which is fixed by bolts, and the base 14 has a first guide groove 1400 and a second guide groove 1401, the first guide groove 1400 is slidably connected to the first backrest mounting member 3, and the second guide groove 1401 is slidably connected to the second backrest mounting member 5.

[0100] Ascending operation process:

[0101] The rotary switch 17 is turned, and the rotary switch 17 drives the gear box 13 to work, and the gear box 13 drives the screw rod 12 to rotate, and the screw rod 12 drives the lumbar support mounting member 1 to move upward, and the lumbar support mounting member 1 drives the first backrest mounting member 3 and the second backrest mounting member 5 to move upward at the same time through two connecting rod units. In the upward movement process, since the movement trajectory of the first backrest mounting member 3 and the second backrest mounting member 5 forms an inverted figure eight structure, the distance between the two will increase. At the same time, the connecting rod unit will be expanded under the drive of the lumbar support mounting member 1, so that the overall length of the connecting rod unit in the vertical direction becomes larger, thereby increasing the distance between the lumbar support mounting member 1 and the backrest mounting member.

[0102] The advantages of this embodiment are:

[0103] (1) The lumbar support can move up and down, and the backrest can move diagonally to achieve size adjustment;

[0104] (2) The backrest and lumbar support can be synchronized under the transmission of the connecting rod unit;

[0105] (3) By utilizing the change in the angle of the connecting rod unit during movement, the backrest and the lumbar support can move at different speeds, so that the distance between the backrest and the lumbar support can also be automatically adjusted;

[0106] (4) The guide groove can control the motion trajectory of the connecting rod unit, thereby controlling the motion trajectory of the backrest, and the guide groove can increase stability;

[0107] (5) The setting of the gearbox realizes the reversing of transmission;

[0108] (6) The movement speed and force can be adjusted by changing the screw pitch or gear ratio;

[0109] (7) The lumbar support mounting part has screw threads that match the screw rod, and the two realize coordinated transmission; Example 3

[0110] See also Fig.11 A seat, the seat back module of which includes a lumbar support 2, a first backrest 4, a second backrest 6 and the lifting mechanism as described in Example 1, the lumbar support mounting member 1 of the lifting mechanism is connected to the lumbar support, the first backrest mounting member 3 of the lifting mechanism is connected to the first backrest 4, and the second backrest mounting member 5 of the lifting mechanism is connected to the second backrest 6. Example 4

[0111] See also Fig.12A seat, wherein the seat back module includes a lumbar support 2, a first backrest 4, a second backrest 6 and the lifting mechanism as described in Example 2, the lumbar support mounting member 1 of the lifting mechanism is connected with the lumbar support, the first backrest mounting member 3 of the lifting mechanism is connected with the first backrest 4, and the second backrest mounting member 5 of the lifting mechanism is connected with the second backrest 6.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A screw-connecting rod transmission type backrest lumbar support linkage lifting mechanism, characterized in that: include: A waist support mounting member (1), wherein the waist support mounting member (1) is used to mount a waist support (2); A first backrest mounting member (3), the first backrest mounting member (3) being used to mount a first backrest (4), and the moving track of the first backrest mounting member (3) being arranged to be inclined; A second backrest mounting member (5), the second backrest mounting member (5) is used to mount a second backrest (6), the movement track of the second backrest mounting member (5) is arranged obliquely, the first backrest mounting member (3) and the second backrest mounting member (5) are arranged opposite to each other on the left and right, the movement tracks of the two form an inverted figure eight structure, and the lumbar support mounting member (1) is located at the lower ends of the two; and A lifting assembly is provided, wherein the lifting assembly is used to drive the lumbar support mounting member (1), the first backrest mounting member (3) and the second backrest mounting member (5) to rise and fall simultaneously, and the lifting mechanism further comprises a first connecting rod unit and a second connecting rod unit which are arranged opposite to each other on the left and right sides, wherein the first connecting rod unit is respectively connected to the lumbar support mounting member (1) and the first backrest mounting member (3), and the second connecting rod unit is respectively connected to the lumbar support mounting member (1) and the second backrest mounting member (5).

2. The screw-connecting rod transmission type backrest lumbar support linkage lifting mechanism according to claim 1, characterized in that: When the lumbar support mounting member (1), the first backrest mounting member (3) and the second backrest mounting member (5) are raised and lowered simultaneously, in the vertical direction, the first connecting rod unit and the second connecting rod unit can be folded and unfolded so that the movement speed of the lumbar support mounting member (1) is lower than the movement speed of the first backrest mounting member (3) and the second backrest mounting member (5).

3. The screw rod and connecting rod transmission type backrest lumbar support linkage lifting mechanism according to claim 1, characterized in that: The lifting assembly comprises a lifting transmission member (7) that can move up and down and lock its position. When the lifting transmission member (7) moves up and down, it can simultaneously drive the waist support mounting member (1), the first backrest mounting member (3) and the second backrest mounting member (5) to move through the first connecting rod unit and the second connecting rod unit.

4. The screw rod and connecting rod transmission type backrest lumbar support linkage lifting mechanism according to claim 3, characterized in that: The first link unit and the second link unit are collectively referred to as a link unit, and the link unit comprises a first link (8), a second link (9) and a third link (10); the lifting transmission member (7) is used to drive the first link (8) to move, the first link (8) is used to drive the second link (9) to move, the second link (9) is used to drive the lumbar support mounting member (1) to move while driving the third link (10) to move, and the third link (10) is used to drive the corresponding backrest mounting member to move.

5. The screw-connecting rod transmission type backrest lumbar support linkage lifting mechanism according to claim 4, characterized in that: One end of the first connecting rod (8) is rotatably connected to the lifting transmission member (7), and the other end is rotatably connected to the second connecting rod (9); one end of the second connecting rod (9) is rotatably connected to the waist support mounting member (1), and the other end is rotatably connected to the third connecting rod (10); the third connecting rod (10) is rotatably connected to the corresponding backrest mounting member.

6. The screw-connecting rod transmission type backrest lumbar support linkage lifting mechanism according to claim 4, characterized in that: The lifting mechanism also includes a fixed seat (11), and the upper end of the second connecting rod (9) is slidably connected to the fixed seat (11).

7. The screw rod and connecting rod transmission type backrest lumbar support linkage lifting mechanism according to claim 3, characterized in that: The lifting assembly further comprises a screw rod (12) and a driving unit. The screw rod (12) is threadedly engaged with the lifting transmission member (7), and the driving unit is used to drive the screw rod (12) to rotate.

8. The screw rod and connecting rod transmission type backrest lumbar support linkage lifting mechanism according to claim 1, characterized in that: The lifting mechanism also includes a base (14), and the waist support mounting component (1), the first backrest mounting component (3) and the second backrest mounting component (5) are respectively slidably connected to the base (14).

9. The screw rod and connecting rod transmission type backrest lumbar support linkage lifting mechanism according to claim 1, characterized in that: The lifting assembly comprises a screw rod (12) and a driving unit, wherein the screw rod (12) is threadedly connected to the lumbar support mounting member (1), the driving unit is used to drive the screw rod (12) to rotate, and the lifting assembly is used to drive the lumbar support mounting member (1) to move up and down, the lumbar support mounting member (1) drives the first backrest mounting member (3) to move up and down through the first connecting rod unit, and the lumbar support mounting member (1) drives the second backrest mounting member (5) to move through the second connecting rod unit.

10. The screw rod and connecting rod transmission type backrest lumbar support linkage lifting mechanism according to claim 9, characterized in that: The first link unit and the second link unit are collectively referred to as a link unit, and the link unit comprises a fourth link (15) and a fifth link (16). The lumbar support mounting component (1) is used to drive the fourth link (15) to move, the fourth link (15) is used to drive the fifth link (16) to move, and the fifth link (16) is used to drive the corresponding backrest mounting component to move.

11. A screw rod and connecting rod transmission type backrest lumbar support linkage lifting mechanism according to claim 10, characterized in that: The lifting mechanism also includes a base (14), one end of a fourth connecting rod (15) is rotatably connected to the base (14), and the other end is rotatably connected to a fifth connecting rod (16), the fifth connecting rod (16) is rotatably connected to a corresponding backrest mounting member, and the lumbar support mounting member (1) is rotatably connected to the fourth connecting rod (15); the first backrest mounting member (3) and the second backrest mounting member (5) are respectively slidably connected to the base (14).

12. A screw-connecting rod transmission type backrest lumbar support linkage lifting mechanism according to claim 7 or 9, characterized in that: The driving unit comprises a gear box (13) and a power source, wherein the gear box (13) is used to drive the screw rod (12) to rotate, and the power source is used to drive the gear box (13) to move, and the power source is a manual driving structure or an electric driving structure.

13. A seat, characterized in that: The seat back module comprises a lumbar support (2), a first backrest (4), a second backrest (6) and a lifting mechanism as described in any one of claims 1 to 12, wherein the lumbar support mounting member (1) of the lifting mechanism is connected to the lumbar support, the first backrest mounting member (3) of the lifting mechanism is connected to the first backrest (4), and the second backrest mounting member (5) of the lifting mechanism is connected to the second backrest (6).

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