Angle adjusting mechanism suitable for backrest and leg support of seat

Abstract

The utility model discloses an angle adjusting mechanism suitable for a backrest and a leg support of a seat. The angle adjusting mechanism comprises a backrest adjusting driving assembly arranged between a seat cushion framework and a backrest framework rotationally connected with the seat cushion framework, and a leg support linkage adjusting assembly arranged between the seat cushion framework and a leg support framework rotationally connected with the seat cushion framework, wherein the chair back adjustment driving assembly comprises a driving piece suitable for performing linear telescopic motion in the direction from the chair back framework to the chair cushion framework, a telescopic rod connected with the driving piece, and a connecting piece arranged between the movable end, far away from the driving piece, of the telescopic rod and the chair back framework; the leg support linkage adjusting assembly comprises a linkage rod extending from the chair back framework to the leg support framework, a first connector arranged between the linkage rod and the chair back framework, and a second connector arranged between the linkage rod and the leg support framework.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, and in particular to an angle adjustment mechanism for the backrest and leg rest of a seat. Background Technology

[0002] Chairs are widely used in offices, homes, or cars. In the use of height-adjustable chairs, for certain usage scenarios, such as offices, the backrest of the height-adjustable chair needs to be adjusted to a flat position relative to the seat cushion in order to facilitate lying down for rest.

[0003] For example, CN111086421B discloses a method for adjusting a reclining car seat. It utilizes the ratchet cover and pawl to allow the backrest frame to be adjusted to any angle during rotation. By using the linkage of the connecting frame, slider, connecting rod, backrest frame, and seat frame, the seat frame can move forward and downward at the same time, and the backrest frame can be flipped backward and slid forward at the same time.

[0004] While the structure of the chairs based on the aforementioned disclosed technologies allows the backrest to be adjusted to a flat position relative to the seat cushion, many existing height-adjustable chairs also include leg rests to further enhance comfort. When the backrest is adjusted to a flat position relative to the seat cushion, the leg rest must also be adjusted to a flat position relative to the seat cushion. For example, CN219515740U discloses a chair backrest reclining mechanism and a chair. The leg rest mechanism includes a telescopic rod, a support plate, and a leg rest body. The telescopic rod is symmetrically arranged at the bottom of the seat body, and a support plate is installed at one end of the telescopic rod. The inner side of the support plate is fixedly connected to the leg rest body. With this structure, when a person uses the chair and the seat and backrest are reclined, the telescopic rod at the bottom of the seat allows the person to pull out the leg rest body from the bottom of the seat, thus providing leg support. This process requires the user to manually pull out the leg rest, which is cumbersome and lacks automation. If the leg rest and backrest each require an automated adjustment mechanism to achieve reclining adjustment relative to the seat cushion, it will increase the complexity of the overall seat structure and increase its production and usage costs.

[0005] Therefore, for seats with leg rests, a simplified structure needs to be designed to optimize the adjustment structure of the backrest and the seat cushion. Utility Model Content

[0006] The purpose of this invention is to provide an angle adjustment mechanism for the backrest and leg rest of a seat to solve the technical problem of optimizing its use.

[0007] The angle adjustment mechanism for the backrest and leg rest of this chair is implemented as follows:

[0008] An angle adjustment mechanism for the backrest and leg rest of a seat, comprising:

[0009] A backrest adjustment drive assembly is disposed between the seat cushion frame and the backrest frame rotatably connected thereto, and a leg support linkage adjustment assembly is disposed between the seat cushion frame and the leg support frame rotatably connected thereto; wherein

[0010] The backrest adjustment drive assembly includes a drive member adapted to make linear telescopic movement along the backrest frame toward the seat cushion frame, a telescopic rod connected to the drive member, and a connector located between the movable end of the telescopic rod away from the drive member and the backrest frame.

[0011] The leg support linkage adjustment assembly includes a linkage rod extending from the backrest frame to the leg support frame, a first connector disposed between the linkage rod and the backrest frame, and a second connector disposed between the linkage rod and the leg support frame.

[0012] When the telescopic rod retracts under the action of the drive component to pull the connecting component, the chair back frame is adapted to rotate outward relative to the chair seat frame so that the angle formed between the chair back frame and the chair seat frame gradually increases until the chair back frame is flat relative to the chair seat frame. At the same time, with the movement of the chair back frame, the first connector drives the linkage rod to move towards the leg support frame so that the angle formed between the leg support frame and the chair seat frame gradually increases until the leg support frame is flat relative to the chair seat frame.

[0013] In an optional embodiment of this invention, the chair back frame has a support beam that is simultaneously connected to the connector and the first connector.

[0014] In an optional embodiment of this utility model, the support beam is located at the corner where the backrest frame and the seat cushion frame are adjacent.

[0015] In an optional embodiment of this utility model, the connecting member has a U-shaped mating groove for hinged engagement with the telescopic rod;

[0016] The connector is fixed to the support beam.

[0017] In an optional embodiment of this utility model, the length of the connecting member along the direction from the chair back frame to the chair seat frame is much smaller than the length of the telescopic rod.

[0018] In an optional embodiment of this utility model, the first connector has a connection port for hinged engagement with the linkage rod, and the first connector is fixed to the support beam.

[0019] In an optional embodiment of this utility model, the length of the first connector along the direction from the chair back frame to the chair seat frame is much smaller than the length of the linkage rod.

[0020] In an optional embodiment of this utility model, the leg support frame has a support rod connected to the second connector;

[0021] The support rod is located at the corner where the leg support frame and the seat cushion frame are adjacent.

[0022] In an optional embodiment of this utility model, the second connector has a connecting portion for hinged engagement with the linkage rod, and the second connector is fixed to the support rod.

[0023] In an optional embodiment of this invention, the length of the second connector along the direction from the seat cushion frame to the leg support frame is much smaller than the length of the linkage rod.

[0024] By adopting the above technical solution, this utility model has the following beneficial effects: The angle adjustment mechanism for the backrest and leg rest of this utility model, through the designed backrest adjustment drive component and leg rest linkage adjustment component, allows the backrest frame to rotate outward relative to the seat cushion frame when the telescopic rod retracts under the action of the drive component to pull the connecting component. This gradually increases the angle between the backrest frame and the seat cushion frame until the backrest frame is flat relative to the seat cushion frame. Simultaneously, with the movement of the backrest frame, the first connector drives the linkage rod to move towards the leg rest frame, further increasing the angle between the leg rest frame and the seat cushion frame until the leg rest frame is flat relative to the seat cushion frame. This structure allows for both backrest and leg rest adjustment simultaneously, requiring only one drive component, thus simplifying the structure and reducing production and usage costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the angle adjustment mechanism for the backrest and leg rest of the seat according to the present invention, when the seat is in a sitting or reclining position.

[0026] Figure 2 This is a structural schematic diagram showing the internal cross-section of the lifting support mechanism of this utility model corresponding to the seat in a flat position;

[0027] Figure 3 This is a structural schematic diagram showing the internal cross-section of the lifting support mechanism of this utility model corresponding to the seat in a seated position.

[0028] Figure 4 for Figure 1 Enlarged view of part A;

[0029] Figure 5 for Figure 1 Enlarged view of part B.

[0030] In the diagram: seat cushion frame 101, backrest frame 102, leg support frame 103, support beam 104, support rod 105, telescopic rod 201, connector 202, U-shaped mating groove 2021, linear screw module 203, sleeve 204, linkage rod 301, first connector 302, connection port 3021, second connector 303, connecting part 3031, hinge 401, armrest 500, connecting piece 601, connecting rod 602, movable piece 603, locking piece 605. Detailed Implementation

[0031] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0032] Please see Figures 1 to 5 As shown, this embodiment provides an angle adjustment mechanism for the backrest and leg rest of a seat, including: a backrest adjustment drive assembly disposed between a seat cushion frame 101 and a backrest frame 102 rotatably connected thereto, and a leg rest linkage adjustment assembly disposed between a seat cushion frame 101 and a leg rest frame 103 rotatably connected thereto.

[0033] In this embodiment, when the chair is used normally as a chair and the person is seated, the backrest frame 102 forms an obtuse angle with respect to the seat cushion frame 101, which is slightly larger than a right angle. The leg rest frame 103 forms an angle with respect to the seat cushion frame 101, which is either a right angle or an obtuse angle slightly larger than a right angle. When the chair is to be used as a recliner, in its maximum deformation state, the backrest frame and leg rest frame 103 can form a straight angle or a very close straight angle with respect to the seat cushion frame 101.

[0034] In general, the backrest adjustment drive assembly includes a drive member adapted to perform linear telescopic movement along the backrest frame 102 toward the seat cushion frame 101, a telescopic rod 201 connected to the drive member, and a connector 202 located between the movable end of the telescopic rod 201 away from the drive member and the backrest frame 102. The telescopic rod 201 does not specifically refer to the rod itself being able to extend and retract, but rather to its ability to extend closer to and retract further away from the backrest frame 102 under the action of the drive member. The drive member can be, for example, but not limited to, a cylinder or a linear screw module 203. When a cylinder is used, the telescopic rod 201 is connected to the piston rod of the cylinder. When a linear screw module 203 is used, the telescopic rod 201 can be connected to a screw body adapted to perform linear movement. In this case, the linear screw module 203 is equipped with a sleeve 204 fitted over the outer layer of the screw body. The telescopic rod 201 can move in and out of the sleeve 204 through linear movement under the action of the screw body. This embodiment does not impose absolute limitations on the specific structure and implementation principle of the driving component. As long as the driving component can drive the telescopic rod 201 to extend closer to the chair back frame and retract further away through a linear motion, the usage requirements of this embodiment can be met.

[0035] Secondly, the leg rest linkage adjustment assembly includes a linkage rod 301 extending from the backrest frame 102 towards the leg rest frame 103, a first connector 302 disposed between the linkage rod 301 and the backrest frame 102, and a second connector 303 disposed between the linkage rod 301 and the leg rest frame 103. The linkage rod 301 is parallel to the telescopic rod 201, allowing the linkage rod 301 and the telescopic rod 201 to follow each other. It should be noted that, in this embodiment, the leg rest linkage adjustment assembly can be symmetrically arranged in two forms, or only one form can be used, both meeting usage requirements. The specific number is not absolutely limited in this embodiment.

[0036] It should be noted that the backrest frame 102 has a support beam 104 that is connected to both the connector 202 and the first connector 302. The support beam 104 is located at the corner where the backrest frame 102 and the seat cushion frame 101 are adjacent. The leg support frame 103 has a support rod 105 that is connected to the second connector 303; the support rod 105 is located at the corner where the leg support frame 103 and the seat cushion frame 101 are adjacent.

[0037] More specifically, the connector 202 has a U-shaped groove 2021 for hinged engagement with the telescopic rod 201, for example, but not limited to, a connecting shaft; the connector 202 is fixed to the support beam 104. The length of the connector 202 along the direction from the backrest frame 102 to the seat cushion frame 101 is much smaller than the length of the telescopic rod 201. As the telescopic rod 201 moves a different distance relative to the backrest frame, the hinged engagement angle between the telescopic rod 201 and the connector 202 will also be different, resulting in different angles between the corresponding backrest frame and the seat cushion frame 101. This allows adjustment of the operating angle of the backrest frame 102 to meet different user needs and improve comfort.

[0038] The first connector 302 has a connection port 3021 for hinged engagement with the linkage rod 301 using, for example, but not limited to, a connecting shaft, and the first connector 302 is fixed to the support beam 104. The length of the first connector 302 along the direction from the backrest frame 102 to the seat cushion frame 101 is much smaller than the length of the linkage rod 301. Optionally, the length of the first connector 302 along the direction from the backrest frame 102 to the seat cushion frame 101 can be the same as the length of the connector 202. The second connector 303 has a connection portion 3031 for hinged engagement with the linkage rod 301 using, for example, but not limited to, a connecting shaft, and the second connector 303 is fixed to the support rod 105. The length of the second connector 303 along the direction from the seat cushion frame 101 to the leg rest frame 103 is much smaller than the length of the linkage rod 301. Here, the length of the second connector 303 along the direction from the backrest frame 102 to the seat cushion frame 101 can be the same as the length of the first connector 302. Alternatively, the length of the linkage rod 301 can be approximately the same as the length of the seat cushion frame 101 along the direction from the backrest frame 102 to the leg rest frame 103. Referring to the accompanying drawings, in one possible scenario, the connector 202 is approximately perpendicular to the support beam 104, and the first connector 302 is approximately perpendicular to the support beam 104, as is the second connector 303 relative to the support rod 105.

[0039] In this regard, it should also be noted that, regarding the seat to which the backrest and leg rest angle adjustment mechanism of this embodiment is applicable, the rotatable connection between the backrest frame 102 and the seat cushion frame 101, and the rotatable connection between the leg rest frame 103 and the seat cushion frame 101, can be any mature means in the prior art. This embodiment does not make an absolute limitation on this. Here, we illustrate an optional implementation with reference to the accompanying drawings:

[0040] A pair of hinges 401 are also provided between the leg support frame 103 and the seat cushion frame 101. A pair of connecting rod assemblies, corresponding one-to-one with the armrests 500 on the backrest frame, are also provided between the backrest frame and the seat cushion frame 101. These connecting rod assemblies include a connecting piece 601 connected to the seat cushion frame 101, a connecting rod 602 with one end rotatably engaged with the connecting piece 601, and a movable piece 603 with the end of the connecting rod 602 away from the connecting piece 601; wherein the end of the movable piece 603 away from the connecting rod 602 rotatably engages with a locking piece 605 fixed to the backrest frame. The length of the connecting rod 602 is much greater than the lengths of the connecting piece 601 and the movable piece 603. In this structure, when the backrest frame adjusts the angle between itself and the seat cushion frame 101 under the action of the backrest adjustment drive component, the linkage assembly deforms accordingly. In other words, the linkage assembly can not only satisfy the need to form a reliable connection between the backrest frame and the seat cushion frame 101, but also meet the linkage requirements during the deformation process of the two, thereby improving the reliability of the mating structure formed by the two.

[0041] In summary, for the angle adjustment mechanism of the backrest and leg rest of the seat in this embodiment, when the telescopic rod 201 retracts under the action of the driving member to pull the connecting member 202, the backrest frame is adapted to rotate outward relative to the seat cushion frame 101 so that the angle between the backrest frame 102 and the seat cushion frame 101 gradually increases until the backrest frame 102 is flat relative to the seat cushion frame 101. At the same time, as the backrest frame 102 moves, the first connecting head 302 drives the linkage rod 301 to move towards the leg rest frame 103 so that the angle between the leg rest frame 103 and the seat cushion frame 101 gradually increases until the leg rest frame 103 is flat relative to the seat cushion frame 101 (of course, in the actual use of the seat, it is not necessary to adjust the backrest frame 102 and the leg rest frame 103 to be flat relative to the seat cushion frame 101 every time; flattening is just one of the most extreme adjustment situations). When the telescopic rod 201 extends under the action of the driving component to push the connecting member 202, the backrest frame is adapted to rotate inward relative to the seat cushion frame 101, so that the angle between the backrest frame and the seat cushion frame 101 gradually decreases until the backrest frame is perpendicular to the seat cushion frame 101. At the same time, with the movement of the backrest frame, the first connecting head 302 drives the linkage rod 301 to move away from the leg support frame 103, so that the angle between the leg support frame 103 and the seat cushion frame 101 gradually decreases until the leg support frame 103 is perpendicular. In other words, the size of the angles formed by the seat cushion frame 101 and the backrest frame relative to the seat cushion frame 101 is controlled by the size of the movement trajectory of the telescopic rod 201 under the action of the driving component.

[0042] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0043] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0047] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. An angle adjustment mechanism for a backrest and a leg rest of a seat, characterized by, The application relates to a chair backrest and legrest linkage adjustment assembly. The chair backrest adjustment driving assembly comprises a driving member adapted to make linear extension and retraction movement along the chair backrest framework towards the chair cushion framework, an extension and retraction rod connected with the driving member, and a connecting member arranged between the extension and retraction rod and the chair backrest framework. The legrest linkage adjustment assembly comprises a linkage rod extending from the chair backrest framework towards the legrest framework, a first connecting head arranged between the linkage rod and the chair backrest framework, and a second connecting head arranged between the linkage rod and the legrest framework. When the extension and retraction rod makes retraction movement under the action of the driving member to pull the connecting member, the chair backrest framework is adapted to turn outwards relative to the chair cushion framework to gradually increase the included angle between the chair backrest framework and the chair cushion framework until the chair backrest framework is flat relative to the chair cushion framework, and at the same time, with the movement of the chair backrest framework, the first connecting head drives the linkage rod to move towards the legrest framework to gradually increase the included angle between the legrest framework and the chair cushion framework until the legrest framework is flat relative to the chair cushion framework. The chair backrest framework has a support beam connected with the connecting member and the first connecting head. The support beam is located at the corner part adjacent to the chair backrest framework and the chair cushion framework.

2. The angular adjustment mechanism suitable for use with a seat back and leg rest according to claim 1, characterized in that, The connecting member has a U-shaped matching groove for hinged matching with the extension and retraction rod.

3. The angular adjustment mechanism suitable for use with a seat back and leg rest according to claim 2, characterized in that, The connecting member is fixed on the support beam.

4. The angular adjustment mechanism suitable for use with a seat back and leg rest according to claim 2 or 3, characterized in that, The length of the connecting member along the chair backrest framework towards the chair cushion framework is much smaller than the length of the extension and retraction rod. The first connecting head has a connecting port for hinged matching with the linkage rod, and the first connecting head is fixed on the support beam.

5. The angular adjustment mechanism suitable for use with a seat back and leg rest according to claim 4, characterized in that, The length of the first connecting head along the chair backrest framework towards the chair cushion framework is much smaller than the length of the linkage rod.

6. The angular adjustment mechanism suitable for use with a seat back and leg rest according to claim 2 or 3, characterized in that, The legrest framework has a support rod connected with the second connecting head.

7. The angular adjustment mechanism suitable for use with a seat back and leg rest according to claim 2 or 3, characterized in that, The support rod is located at the corner part adjacent to the legrest framework and the chair cushion framework.

8. The angular adjustment mechanism suitable for use with a seat back and leg rest according to claim 1, characterized in that, The second connecting head has a connecting part for hinged matching with the linkage rod, and the second connecting head is fixed on the support rod. The length of the second connecting head along the chair cushion framework towards the legrest framework is much smaller than the length of the linkage rod.

9. The angular adjustment mechanism suitable for use with a seat back and leg rest according to claim 8, characterized in that, ​ 10. The angular adjustment mechanism suitable for use with a seat back and leg rest according to claim 8 or 9, characterized in that, ​

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