Electric backrest and seat

Abstract

The utility model relates to the technical field of seats, and discloses an electric backrest and a seat, and the electric backrest comprises an upper grid framework, a lower grid framework, a middle grid framework and a driver. According to the electric backrest, one pull rope is tightened and the other pull rope is released through the driver, so that the upper grid framework and the lower grid framework are driven to correspondingly turn over, hunching of the upper end or the lower end of the middle grid framework is achieved, and then the function that the hunching position and the hunching degree of the waist support can be adjusted is achieved; and four-direction adjustment can be completed only through one driver, so that the manufactured seat is simple in structure and easy to assemble, and the manufacturing cost is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to chair technical field especially relates to a kind of electric backrest and seat. BACKGROUND

[0002] Human spine includes cervical vertebra, thoracic vertebra, lumbar vertebra and sacrum (sacral vertebra), in lumbar region, since having stronger activity and supporting most of body weight, and bearing various vibrations caused by human activity, so that lumbar region becomes the most vulnerable and most need to protect area.Once lumbar vertebra is separated from "S" shape due to various reasons, the pressure between vertebrae in lumbar region can rapidly increase, so that person is more prone to fatigue and pain, and thus the structure of seat needs to be improved.

[0003] Nowadays, the seat on most vehicle models is matched with adjustable electric backrest to adjust according to the respective needs of driver and passenger.Currently, mainstream four-way adjustment structure is composed of framework steel wire, plastic supporting plate and supporting steel plate, driving unit, screw rod and sliding block, and needs to use two groups of screw rod driving mechanism to realize the front and rear action of upper position and lower position respectively, and the parts of such product are very much, driving unit structure is very complex, assembly process is relatively cumbersome, and the overall price of product is expensive;Another kind of net format four-way waist support also needs grid, two groups of pull wires and two groups of driving units to realize, and since it is supported by pull wire and the grid surface is lifted, the cost is expensive and the adjustment effect is not good. SUMMARY

[0004] Based on the above problems, the purpose of the utility model is to provide a kind of electric backrest and seat, optimize structure layout, reduce cost while realizing four-way adjustment function of lumbar support.

[0005] To achieve the above purpose, on the one hand, the utility model adopts the following technical scheme:

[0006] An electric backrest, comprising upper grid framework, lower grid framework, middle grid framework and driver, wherein:

[0007] The upper end of middle grid framework is rotatably connected with upper grid framework, and the lower end of middle grid framework is rotatably connected with lower grid framework;

[0008] The two sides of upper grid framework are provided with first hooks fixed with seat framework, and upper grid framework can be flipped around the axis of the two sides of first hooks;

[0009] The two sides of lower grid framework are provided with second hooks fixed with seat framework, and lower grid framework can be flipped around the axis of the two sides of second hooks;

[0010] The driver is arranged on the middle grid framework, a pull rope is connected between the first output end of the driver and the upper grid framework, and another pull rope is connected between the second output end of the driver and the lower grid framework, and the driver is used for tightening one pull rope and loosening the other pull rope, so that the upper end or the lower end of the middle grid framework is arched.

[0011] As an optional solution, the upper grid framework comprises two symmetrically arranged first C-shaped steel wires, the two first C-shaped steel wires are connected through a plurality of first transverse steel wires, and the first hook hoop is arranged on the first C-shaped steel wire.

[0012] The lower grid framework comprises two symmetrically arranged second C-shaped steel wires, the two second C-shaped steel wires are connected through a plurality of second transverse steel wires, and the second hook hoop is arranged on the second C-shaped steel wire.

[0013] The middle grid framework comprises two symmetrically arranged third C-shaped steel wires, the two third C-shaped steel wires are connected through a plurality of third transverse steel wires, and each third transverse steel wire is connected through a longitudinal steel wire.

[0014] As an optional solution, the first C-shaped steel wire, the third C-shaped steel wire and the second C-shaped steel wire are longitudinally aligned, and the lower end of the first C-shaped steel wire and the upper end of the third C-shaped steel wire are wrapped through a fixed metal clamp, and the lower end of the third C-shaped steel wire and the upper end of the second C-shaped steel wire are wrapped through a fixed metal clamp.

[0015] As an optional solution, the upper end of the first C-shaped steel wire and the lower end of the second C-shaped steel wire are respectively provided with a hook part for fixing the corresponding pull rope.

[0016] As an optional solution, the driver comprises a driving strip capable of moving up and down, the upper end of the driving strip is connected with the upper grid framework through a pull rope, and the lower end of the driving strip is connected with the lower grid framework through another pull rope.

[0017] As an optional solution, the driver further comprises a motor and a wheel shaft, the driving strip is provided with a rack part, the output shaft of the motor is provided with a worm, and the wheel shaft is provided with a gear matched with the rack part in transmission and a worm wheel matched with the worm in transmission.

[0018] On the other hand, the utility model adopts the following technical scheme:

[0019] A seat comprises a seat framework, a seat foam and the electric backrest, the electric backrest is arranged between the seat framework and the seat foam, and the first hook and the second hook of the electric backrest are fixed on the seat framework.

[0020] The utility model has the advantages of:

[0021] Compared with the prior art, the electric backrest tightens one pull rope and loosens the other pull rope through the driver, reverses the upper grid framework and the lower grid framework correspondingly, realizes the arching of the upper end or the lower end of the middle grid framework, and further realizes the adjustable function of the arching position and the arching degree of the waist support, and four-way adjustment can be completed only through one driver, so that the seat structure is simple, assembly is simple, and manufacturing cost is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a front structure schematic view of the electric backrest provided by the embodiment of the present application;

[0023] Figure 2 is a back structure schematic view of the electric backrest provided by the embodiment of the present application;

[0024] Figure 3 is a schematic view of adjusting the arching of the upper end of the middle grid framework provided by the embodiment of the present application;

[0025] Figure 4 is a schematic view of adjusting the arching of the lower end of the middle grid framework provided by the embodiment of the present application.

[0026] In the drawings:

[0027] 1, upper grid framework; 11, first C-shaped steel wire; 12, first transverse steel wire; 2, lower grid framework; 21, second C-shaped steel wire; 22, second transverse steel wire; 3, middle grid framework; 31, third C-shaped steel wire; 32, third transverse steel wire; 33, longitudinal steel wire; 4, driver; 41, driving strip; 42, motor; 43, wheel shaft; 44, rack part; 45, worm; 5, first hook; 6, second hook; 7, pull rope; 8, fixed metal clamp; 9, bent hook part. DETAILED DESCRIPTION

[0028] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and are not a limitation on the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, rather than all the structures.

[0029] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature therebetween. Moreover, the first feature "on", "above" and "on the surface" of the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of the present embodiment, the terms "up", "down", "left", "right" and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In addition, the terms "first", "second" and the like are only used for differentiation in description and have no special meaning.

[0033] Please refer to Figures 1 to 4 As shown in the drawings, the present embodiment provides an electric backrest, comprising an upper grid framework 1, a lower grid framework 2, a middle grid framework 3 and a driver 4, wherein:

[0034] The upper end of the middle grid framework 3 is rotationally connected with the upper grid framework 1, and the lower end of the middle grid framework 3 is rotationally connected with the lower grid framework 2;

[0035] The upper grid framework 1 is provided with first hooks 5 fixed with the seat framework on both sides, and the upper grid framework 1 can be flipped around the axis of the first hooks 5 on both sides;

[0036] The lower grid framework 2 is provided with second hooks 6 fixed with the seat framework on both sides, and the lower grid framework 2 can be flipped around the axis of the second hooks 6 on both sides;

[0037] The driver 4 is arranged on the middle grid framework 3, and a pull rope 7 is connected between the first output end of the driver 4 and the upper grid framework 1 and between the second output end of the driver 4 and the lower grid framework 2, respectively, and the driver 4 is used to tighten one pull rope 7 and loosen the other pull rope 7, so that the upper end or the lower end of the middle grid framework 3 is arched.

[0038] Thus, by tightening one pull rope 7 and loosening the other pull rope 7 through the driver 4, the upper lattice framework 1 and the lower lattice framework 2 are correspondingly turned over, the upper end or the lower end of the middle lattice framework 3 is arched, and the waist support arching position and the arching degree are adjustable, and only one driver 4 is needed to complete the four-way adjustment, thereby greatly simplifying the structural complexity of the electric backrest, reducing the assembly difficulty and the manufacturing cost.

[0039] Optionally, the upper lattice framework 1 includes two symmetrically arranged first C-shaped steel wires 11, the two first C-shaped steel wires 11 are connected through a plurality of first transverse steel wires 12, and the first hook 5 is provided on the first C-shaped steel wire 11; the lower lattice framework 2 includes two symmetrically arranged second C-shaped steel wires 21, the two second C-shaped steel wires 21 are connected through a plurality of second transverse steel wires 22, and the second hook 6 is provided on the second C-shaped steel wire 21; and the middle lattice framework 3 includes two symmetrically arranged third C-shaped steel wires 31, the two third C-shaped steel wires 31 are connected through a plurality of third transverse steel wires 32, and each third transverse steel wire 32 is connected through a longitudinal steel wire 33.

[0040] Thus, by interweaving each steel wire into the upper lattice framework 1, the lower lattice framework 2 and the middle lattice framework 3, the structure is simple but can meet the use requirements, and the split type framework structure is beneficial to realize more flexible support adjustment, and the structure is ingenious.

[0041] Further, the first C-shaped steel wire 11, the third C-shaped steel wire 31 and the second C-shaped steel wire 21 are longitudinally aligned, and the lower end of the first C-shaped steel wire 11 and the upper end of the third C-shaped steel wire 31 and the lower end of the third C-shaped steel wire 31 and the upper end of the second C-shaped steel wire 21 are respectively wrapped through the fixed metal clip 8.

[0042] Among them, the fixed metal clip 8 is a standard part, which ensures that the first C-shaped steel wire 11 and the third C-shaped steel wire 31 and the third C-shaped steel wire 31 and the second C-shaped steel wire 21 form a connection while also allowing relative turning motion. In addition, the length of the middle lattice framework 3 is significantly longer than the length of the upper lattice framework 1 and the lower lattice framework 2, which can prevent the upper lattice framework 1 and the lower lattice framework 2 from appearing at a dead point position when turning over relative to the middle lattice framework 3, and ensure that the structure is normal and reliable.

[0043] Optionally, the upper end of the first C-shaped steel wire 11 and the lower end of the second C-shaped steel wire 21 are respectively provided with a hook portion 9 for fixing the corresponding pull rope 7.

[0044] Thus, the hook portion 9 is connected with the pull rope 7, and the hook portion 9 serves as a fixed point when force is applied, ensuring that the driver 4 stably transmits the pulling force when performing the action.

[0045] Optionally, the driver 4 comprises a driving bar 41 which can move up and down, the upper end of the driving bar 41 is connected with the upper grid framework 1 through a pull rope 7, and the lower end of the driving bar 41 is connected with the lower grid framework 2 through another pull rope 7.

[0046] Thus, by moving the driving bar 41 up and down, one of the two pull ropes 7 is tightened and the other is loosened, and only one driver 4 is needed to complete the adjustment of the upper end arch or the lower end arch of the middle grid framework 3, thereby reducing the structural complexity.

[0047] Further, the driver 4 further comprises a motor 42 and an axle 43, the driving bar 41 is provided with a rack part 44, the output shaft of the motor 42 is provided with a worm 45, the axle 43 is provided with a gear which cooperates with the rack part 44 for transmission and a worm wheel which cooperates with the worm 45 for transmission, Figure 2 The gear and the worm wheel on the axle 43 are not shown.

[0048] Thus, the motor 42 drives the worm 45 to rotate the worm wheel, and the gear coaxial with the worm wheel cooperates with the rack part 44 to move the driving bar 41 up and down, thereby achieving the adjustment of the upper end arch or the lower end arch of the middle grid framework 3. Through this design, the precise control of the motor 42 can realize the fine adjustment of the arching angle of the middle grid framework 3 to adapt to the use requirements in different scenarios.

[0049] Specific adjustment process:

[0050] 1) When the waist support position needs to be adjusted upward, the motor 42 sends a command to drive the driving bar 41 to move downward, so that the pull rope 7 above the driver 4 is tightened and the pull rope 7 below the driver 4 is loosened, the upper end of the upper grid framework 1 is pulled to flip relative to the first hook 5, thereby causing the lower end of the upper grid framework 1 to rotate relative to the upper end of the middle grid framework 3 to arch, and the lower end of the middle grid framework 3 is concave under the linkage, as shown in Figure 3 .

[0051] 2) When the waist support position needs to be lowered, the motor 42 operates in the opposite direction, the driving bar 41 moves upward, at this time the pull rope 7 above the driver 4 is loosened and the pull rope 7 below the driver 4 is tightened, the lower end of the lower grid framework 2 is flipped relative to the second hook 6 due to being pulled, thereby causing the upper end of the lower grid framework 2 to rotate relative to the lower end of the middle grid framework 3 to arch, and the upper end of the middle grid framework 3 is concave under the linkage, as shown in Figure 4 .

[0052] In addition, the stroke of the driving bar 41 controlled by the motor 42 can realize the fine adjustment of the arching degree of the middle grid framework 3, thereby meeting the individualized needs of different users for the height of the waist support.

[0053] On this basis, the embodiment further provides a seat, comprising a seat framework, a seat foam and the electric backrest, the electric backrest is arranged between the seat framework and the seat foam, and the first hook 5 and the second hook 6 of the electric backrest are fixed on the seat framework.

[0054] Therefore, the seat structure made of the electric backrest is simple, easy to assemble and greatly reduces manufacturing cost.

[0055] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent substitution and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. A motorized backrest, characterized in that, The grid frame (1), the lower grid frame (2), the middle grid frame (3) and the driver (4) are included, wherein: The upper end of the middle grid frame (3) is rotatably connected with the upper grid frame (1), and the lower end of the middle grid frame (3) is rotatably connected with the lower grid frame (2); The two sides of the upper grid frame (1) are provided with the first hooks (5) fixed with the seat frame, and the upper grid frame (1) can be turned around the axis of the first hooks (5) on the two sides; The two sides of the lower grid frame (2) are provided with the second hooks (6) fixed with the seat frame, and the lower grid frame (2) can be turned around the axis of the second hooks (6) on the two sides; The driver (4) is arranged on the middle grid frame (3), and the first output end of the driver (4) and the second output end of the driver (4) are respectively connected with the pull rope (7) between the upper grid frame (1) and the lower grid frame (2), so that the driver (4) is used for tightening one pull rope (7) and relaxing the other pull rope (7), so that the upper end or the lower end of the middle grid frame (3) is arched.

2. The motorized backrest of claim 1, wherein, The upper grid frame (1) includes two symmetrically arranged first C-shaped steel wires (11), and the first hooks (5) are wrapped on the first C-shaped steel wires (11). The lower grid frame (2) includes two symmetrically arranged second C-shaped steel wires (21), and the second hooks (6) are wrapped on the second C-shaped steel wires (21). The middle grid frame (3) includes two symmetrically arranged third C-shaped steel wires (31), and the third hooks (6) are wrapped on the third C-shaped steel wires (31).

3. The motorized backrest of claim 2, wherein, The first C-shaped steel wire (11), the third C-shaped steel wire (31) and the second C-shaped steel wire (21) are longitudinally aligned, and the lower end of the first C-shaped steel wire (11) and the upper end of the third C-shaped steel wire (31) are wrapped by the fixed metal clamp (8) between them.

4. The motorized backrest of claim 2, wherein, The upper end of the first C-shaped steel wire (11) and the lower end of the second C-shaped steel wire (21) are respectively provided with the hook part (9) for fixing the corresponding pull rope (7).

5. The motorized backrest of claim 1, wherein, The driver (4) includes a driving bar (41) that can move up and down, the upper end of the driving bar (41) is connected with the upper grid frame (1) through one pull rope (7), and the lower end of the driving bar (41) is connected with the lower grid frame (2) through another pull rope (7).

6. The motorized backrest of claim 5, wherein, The driver (4) further comprises a motor (42) and an axle (43), a rack portion (44) is arranged on the driving bar (41), an output shaft of the motor (42) is provided with a worm (45), and a gear wheel cooperating with the rack portion (44) and a worm wheel cooperating with the worm (45) are arranged on the axle (43).

7. A seat, characterized by A seat comprising a seat frame, a seat foam and an electric backrest according to any one of claims 1-6 arranged between the seat frame and the seat foam, and wherein the first hook (5) and the second hook (6) of the electric backrest are fixed to the seat frame.

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