Chair frame
By introducing synchronous linkages and planar four-bar linkages into the chair frame, the problem of unreasonable linkage structure in existing chair frames is solved, realizing smooth linkage between the backrest and footrest and adjustable headrest, thus improving the comfort and simplicity of the chair.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-06
- Publication Date
- 2026-03-31
AI Technical Summary
In existing chair frames, the linkage structure between the footrest and the backrest is poorly designed, resulting in an excessive tilt angle, poor linkage smoothness, and a lack of adjustable functions, such as the sliding and telescopic extension of the footrest and the angle adjustment of the headrest.
Design a chair frame that adopts a synchronous linkage structure. By tilting the front and rear tilting arms, the height difference between the hinge center lines is reduced. A planar four-bar linkage mechanism is used to achieve synchronous linkage between the backrest and footrest, increasing the smoothness of linkage. At the same time, a sliding bracket and a rocker slider mechanism are introduced to realize the extension and retraction adjustment of the footrest. The angles of the headrest and backrest are adjustable.
It achieves smooth linkage between the backrest and footrest, simplifies the chair frame structure, increases comfort and flexibility, provides headrest angle adjustment function, and enhances user experience.
Smart Images
Figure CN224055626U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a piece of furniture, and more particularly to a chair frame. Background Technology
[0002] With the continuous development of the economy and the continuous progress of society, people's lives are provided with an increasingly rich variety of material consumer goods, and chairs are one of these many material consumer goods.
[0003] In the existing chair frame, it can be adjusted and switched between sitting and reclining positions to better meet the different functional needs of users.
[0004] However, in existing chair frames, although the flipping and unfolding of the footrest relative to the seat cushion and the forward and backward flipping of the backrest relative to the seat cushion are synchronized, the linkage structure that achieves the synchronized movement between the footrest and the backrest is poorly designed. The height difference between the hinge center lines of the linkage structure and the footrest and the hinge center lines of the linkage structure and the backrest results in an excessively large tilt angle. This makes it impossible for the linkage structure to be inserted into the seat cushion from the front and back. On the one hand, this makes the existing chair frame not simple, and on the other hand, it results in poor smoothness of the linkage between the footrest and the backrest.
[0005] Furthermore, in the existing chair frame, the angle between the headrest and the backrest is not adjustable; in addition, the footrest does not have a sliding and telescopic adjustment function.
[0006] Therefore, there is an urgent need for a chair frame to overcome one or more of the above-mentioned defects. Utility Model Content
[0007] The purpose of this utility model is to provide a chair frame that makes the synchronous movement between the backrest and the footrest smoother, and also makes the rod body simpler by passing through the seat cushion from the front and back.
[0008] To achieve the above objectives, the chair frame of this utility model includes a seat cushion, a footrest hinged to the front end of the seat cushion around a first hinge center line, a backrest hinged to the rear end of the seat cushion around a second hinge center line, and a synchronizing linkage for synchronously linking the footrest and the backrest. The backrest can flip relative to the seat cushion in the front-back direction, and the footrest can flip and unfold relative to the seat cushion in the front-back direction. The synchronizing linkage has a rod extending in the front-back direction of the seat cushion, a forward tilting arm connected to the rod and extending obliquely towards the front of the seat cushion relative to the rod, and a rear tilting arm connected to the rod and extending obliquely towards the rear of the seat cushion relative to the rod. One of the rear tilting arm and the front tilting arm is arranged upwards and the other downwards. The front tilting arm is hinged to the footrest around a third hinge center line, and the rear tilting arm is hinged to the backrest around a fourth hinge center line.
[0009] Compared with existing technologies, the design of "the front tilt arm extending obliquely towards the front of the seat cushion relative to the rod, and the rear tilt arm extending obliquely towards the rear of the seat cushion relative to the rod, with one of the front tilt arm and the other downwardly arranged" can reduce the tilt of the synchronous linkage due to the height difference between the center lines of the third and fourth hinges, thus allowing the synchronous linkage to pass through the seat cushion from the front to the back, ensuring a simpler chair frame. On the other hand, it increases the swaying effect of the synchronous linkage during the linkage between the backrest and the footrest, making the synchronous linkage between the backrest and the footrest more sensitive and smooth.
[0010] Preferably, the length of the rear tilt arm is greater than the length of the front tilt arm.
[0011] Preferably, the rod is placed inside the seat cushion, and the rear tilt arm is located outside the seat cushion.
[0012] Preferably, a thickened and reinforced structure is provided at the corner between the rod and the front tilting arm and / or at the corner between the rod and the rear tilting arm; a downward positioning notch is also provided at the corner between the rod and the rear tilting arm, and a positioning support column is correspondingly provided on the backrest for positioning and cooperating with the positioning notch to support the synchronous connecting rod from below, and the center line of the second hinge coincides with the center line of the positioning support column.
[0013] Preferably, the first hinge center line to the fourth hinge center line are parallel to each other, and the distance between the fourth hinge center line and the second hinge center line is greater than the distance between the third hinge center line and the first hinge center line.
[0014] Preferably, the distance between the first hinge center line and the second hinge center line is less than the distance between the fourth hinge center line and the third hinge center line, and the distance between the first hinge center line and the second hinge center line is greater than the distance between the fourth hinge center line and the second hinge center line.
[0015] Preferably, the chair frame of this utility model further includes a base and a connecting rod. The connecting rod is hinged to the base around a fifth hinge center line, and the connecting rod is also hinged to the backrest around a sixth hinge center line. The seat cushion is hinged to the base around a seventh hinge center line, so that the base, connecting rod, backrest, and seat cushion together form a planar four-bar linkage mechanism. During the process of the backrest flipping relative to the seat cushion, the connecting rod drives the seat cushion to flip synchronously relative to the base.
[0016] Preferably, the base is located adjacent to the front of the backrest, the first to seventh hinge center lines are parallel to each other, the fifth hinge center line is located behind the seventh hinge center line and in front of the second hinge center line, the sixth hinge center line is located in front of and above the second hinge center line and above the fifth hinge center line; the distance between the seventh hinge center line and the second hinge center line is greater than the distance between the seventh hinge center line and the fifth hinge center line, and the distance between the seventh hinge center line and the fifth hinge center line is greater than the distance between the sixth hinge center line and the second hinge center line and the distance between the fifth hinge center line and the sixth hinge center line, respectively.
[0017] Preferably, the footrest includes a flip base hinged to the front end of the seat cushion around the first hinge center line, a sliding bracket slidably disposed on the flip base, and a linkage component disposed between the sliding bracket and the seat cushion. The linkage component drives the sliding bracket to slide out or retract from the flip base in a corresponding manner as the flip base rotates relative to the seat cushion around the first hinge center line.
[0018] Preferably, the linkage assembly includes a first rod, a second rod, a push-pull rod, and a flip seat. The first rod is hinged to the sliding bracket and the second rod, and the second rod is also hinged to the flip base frame, so that the flip base frame, the first rod, the second rod, and the sliding bracket together constitute a rocker-slider mechanism. The flip seat is flipped and connected to the seat cushion around the flip center line, and the flip center line is parallel to the first hinge center line. The push-pull rod is hinged to the flip seat and the second rod, respectively.
[0019] Preferably, the second rod is hinged to the left or right side of the flipping base, the push-pull rod is hinged to the middle of the second rod, and the first rod is hinged to the middle of the sliding bracket; a silent slide rail is provided between the sliding bracket and the flipping base.
[0020] Preferably, the chair frame of this utility model further includes a headrest, a hinge, a spring, and a handle. The headrest is assembled and connected to the backrest by means of the hinge. The spring is disposed between the footrest and the seat cushion, and the spring is configured to cause the footrest to flip in the folding direction. The handle is inserted into the rear end of the seat cushion and the synchronous linkage in the left-right direction. The linkage has an arc-shaped clearance hole for the handle to pass through, and the handle can selectively lock or unlock the synchronous linkage. Attached Figure Description
[0021] Figure 1This is a plan view of the chair frame of this utility model in a seated position, viewed from left to right along the seat cushion.
[0022] Figure 2 This is a plan view of the chair frame of this utility model in a reclining position, viewed from left to right along the seat cushion.
[0023] Figure 3 Is Figure 2 Based on this, the headrest is adjusted to be aligned with the backrest in a plan view.
[0024] Figure 4 yes Figure 1 A 3D view of the chair frame in the indicated state.
[0025] Figure 5 yes Figure 4 A 3D view taken from another angle with the tripod concealed.
[0026] Figure 6 yes Figure 4 A 3D view showing the legs, springs, and seat cushion hidden behind the camera.
[0027] Figure 7 yes Figure 1 A three-dimensional view of the footrest in the chair frame as shown.
[0028] Figure 8 yes Figure 3 A 3D view of the chair frame in the indicated state.
[0029] Figure 9 yes Figure 8 The image shown is a 3D view of the chair frame with the legs, springs, and seat cushion concealed.
[0030] Figure 10 yes Figure 8 The image shows a 3D view of the footrest in the chair frame, which also hides the flip-up seat of the footrest.
[0031] Figure 11 This is a perspective view of the synchronous linkage in the chair frame of this utility model.
[0032] Figure 12 yes Figure 11 The diagram shows a three-dimensional view of the synchronizing link at another angle.
[0033] Figure 13 yes Figure 11 The diagram shown is a plan view of the synchronizing link viewed in the direction indicated by the arrow next to it. Detailed Implementation
[0034] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings.
[0035] Please see Figure 1, Figure 2 , Figure 3 , Figure 4 and Figure 8 The chair frame 100 of this utility model includes a seat cushion 10, a footrest 20 hinged around a first hinge center line C1 to the front end 11 of the seat cushion 10, a backrest 30 hinged around a second hinge center line C2 to the rear end 12 of the seat cushion 10, and a synchronous connecting rod 40 for synchronously linking the footrest 20 and the backrest 30.
[0036] The backrest 30 can be flipped relative to the seat cushion 10 in the front-back direction to meet the requirement that the backrest 30 can be flipped forward or backward around the second hinge center line C2; optionally, in Figure 4 As an example, the backrest 30 is hinged to the rear end 12 of the seat cushion 10 on both the left and right sides around the second hinge center line C2, so as to further improve the reliability of the backrest 30 flipping relative to the seat cushion 10.
[0037] Meanwhile, the footrest 20 can be flipped and folded relative to the seat cushion 10 in the front-to-back direction, so that when not in use, the footrest 20 can be folded under the seat cushion 10, as shown in the diagram. Figure 1 As shown, to avoid the footrest 20 protruding outward from the front of the seat cushion 10 when the chair frame 100 of this utility model is in a sitting position, thus preventing it from obstructing the user's feet; alternatively, in Figure 4 As an example, the footrest 20 is hinged to the front end 11 of the seat cushion 10 on both the left and right sides around the first hinge center line C1, so as to further improve the reliability of the footrest 20 flipping relative to the seat cushion 10.
[0038] Combined Figure 6 and Figure 9 The synchronous linkage 40 has a rod 41 extending along the front-rear direction of the seat cushion 10, a forward tilting arm 42 connected to the rod 41 and extending obliquely towards the front of the seat cushion 10 relative to the rod 41, and a rear tilting arm 43 connected to the rod 41 and extending obliquely towards the rear of the seat cushion 10 relative to the rod 41. The rear tilting arm 43 is also arranged upwards while the forward tilting arm 42 is arranged downwards, so that the two are not located on the same side of the rod 41 (e.g., the upper or lower side of the rod 41). The forward tilting arm 42 is hinged to the footrest 20 about the third hinge center line C3, and the rear tilting arm 43 is hinged to the backrest 30 about the fourth hinge center line C4. Optionally, in Figure 1 In this example, the seat cushion 10, footrest 20, backrest 30, and synchronizing linkage 40 together constitute a planar four-bar linkage, but this is not a limitation. Specifically, in Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 9As an example, the first hinge center line C1, the second hinge center line C2, the third hinge center line C3, and the fourth hinge center line C4 are parallel to each other. The distance between the fourth hinge center line C4 and the second hinge center line C2 is greater than the distance between the third hinge center line C3 and the first hinge center line C1. See the attached diagram for the desired configuration. Figure 1 As shown; therefore, during the switching between a sitting position and a reclining position in the chair frame 100 of this utility model, the rotation speed of the footrest 20 relative to the seat cushion 10 is greater than the synchronous rotation speed of the backrest 30 relative to the seat cushion 10, thereby making the rotation angle of the backrest 30 smaller than the rotation angle of the footrest 20, thus satisfying the requirement that "the footrest 20 unfolds to..." Figure 2 and Figure 3 The upper front part of the seat cushion 10 shown can be folded up when not in use. Figure 1 The position below the seat cushion 10 shown is required. It should be noted that, although Figures 11 to 13 The diagram shows the front tilt arm 42 facing downwards and the rear tilt arm 43 facing upwards. Obviously, depending on actual needs, the front tilt arm 42 can also be arranged with the rear tilt arm 43 facing downwards; therefore, it is not considered a specific arrangement. Figures 11 to 13 The above is a limited description. More specifically, as follows:
[0039] like Figure 1 As shown, as an example, the distance between the first hinge center line C1 and the second hinge center line C2 is less than the distance between the fourth hinge center line C4 and the third hinge center line C3, and the distance between the first hinge center line C1 and the second hinge center line C2 is greater than the distance between the fourth hinge center line C4 and the second hinge center line C2. This design makes the synchronous link 40 and the seat cushion 10 form two long links in the planar four-bar linkage, while the footrest 20 and the backrest 30 form two short links in the planar four-bar linkage.
[0040] like Figures 11 to 13 As shown, as an example, the arm length L2 of the rear tilt arm 43 is greater than the arm length L1 of the front tilt arm 42, to further increase the swaying effect of the synchronous linkage 40 during the linkage between the backrest 30 and the footrest 20. Additionally, in Figure 4 and Figure 5 In this example, the rod 41 is placed inside the seat cushion 10, which provides protection for the rod 41 and prevents the risk of the rod 41 pinching the user laterally due to its location outside the seat cushion 10. The tilting arm 43 is located outside the seat cushion 10 to better meet the requirement that the tilting arm 43 and the backrest 30 are side-by-side and hinged. Alternatively, it can be combined with... Figures 1 to 4As an example, the tilt arm 43 is hinged to the backrest 30 from the outside to avoid the risk of pushing against the backrest 30 when the tilt arm 43 is hinged to the backrest 30 from the inside. It should be noted that when the footrest 20 and the backrest 30 are each hinged to the seat cushion 10 from the left and right sides respectively, the synchronous linkages 40 are arranged on the left and right sides respectively to meet the need for the synchronous linkages 40 on the same side to be hinged to the corresponding side of the footrest 20 and the backrest 30.
[0041] For example Figures 11 to 13 As shown, as an example, thickened reinforcing structures 44 are provided at the corners between the rod 41 and the front tilting arm 42 and between the rod 41 and the rear tilting arm 43. These thickened reinforcing structures 44 increase the strength of the corners between the rod 41 and the front tilting arm 42 and between the rod 41 and the rear tilting arm 43. This allows for a larger tilt angle relative to the seat cushion 10, provided the synchronous connecting rod 40 has sufficient strength. The maximum tilt angle is visible in the image. Figure 2 As shown in α2, this enables the chair frame 100 of this invention to have a zero-gravity function. Furthermore, in... Figures 11 to 13 As an example, a downward-facing positioning notch 45 is provided at the corner between the rod 41 and the rear tilting arm 43. A corresponding positioning support post 31 is provided on the backrest 30 to engage with the positioning notch 45 and support the synchronous connecting rod 40 from below. The state of the positioning support post 31 supporting the synchronous connecting rod 40 is shown in the figure. Figure 9 As shown, this design ensures that the chair frame 100 of this invention is stabilized when switching to a reclining position; at this time, the center line of the second hinge C2 coincides with the center line of the positioning support column 31 to simplify the structure. Specifically, as an example, when the chair frame 100 of this invention is in a reclining position... Figure 1 In the seated position shown, the angle α2 between the backrest 30 and the seat cushion 10 is 105 degrees. The chair frame 100 of this invention is in the position shown... Figure 2 and Figure 3 In the lying position shown, the angle α2 between the backrest 30 and the seat cushion 10 is 130 degrees. It should be noted that, although... Figure 11 The diagram shows that thickened reinforcing structures 44 are provided at the corners between the rod 41 and the front tilting arm 42, and at the corners between the rod 41 and the rear tilting arm 43. Obviously, depending on actual needs, the thickened reinforcing structures 44 can also be provided at either the corner between the rod 41 and the front tilting arm 42 or the corner between the rod 41 and the rear tilting arm 43. Therefore, it is not considered... Figure 11 The above is the limit.
[0042] like Figure 5 , Figure 6 and Figure 9As shown, as an example, the chair frame 100 of this utility model also includes a base 50 and a connecting rod 60. The connecting rod 60 is hinged to the base 50 around the fifth hinge center line C5, and also hinged to the backrest 30 around the sixth hinge center line C6; the seat cushion 10 is hinged to the base 50 around the seventh hinge center line C7, so that the base 50, connecting rod 60, backrest 30 and seat cushion 10 together form a planar four-bar linkage mechanism; therefore, during the process of the backrest 30 flipping relative to the seat cushion 10, the backrest 30 drives the seat cushion 10 to flip synchronously relative to the base 60 through the connecting rod 60, so that when the chair frame 100 of this utility model switches from a sitting position to a reclining position, the seat cushion 10, together with the backrest 30 and footrest 20, tilts backward relative to the base 50, so that when the chair frame 100 of this utility model is in the reclining position, the footrest 20 faces higher and the backrest 30 faces lower, thus improving the zero-gravity function of the chair frame 100 of this utility model. Specifically, in Figure 6 and Figure 9 In the example, the base 50 is located adjacent to the front of the backrest 30. The first hinge center line C1 to the seventh hinge center line C7 are parallel to each other. The fifth hinge center line C5 is located behind the seventh hinge center line C7 and is also located in front of the second hinge center line C2. The sixth hinge center line C6 is located in front of and above the second hinge center line C2 and is also located above the fifth hinge center line C5. (See attached diagram.) Figure 6 and Figure 9 As shown; furthermore, the distance between the seventh hinge center line C7 and the second hinge center line C2 is greater than the distance between the seventh hinge center line C7 and the fifth hinge center line C5. The distance between the seventh hinge center line C7 and the fifth hinge center line C5 is greater than the distance between the sixth hinge center line C6 and the second hinge center line C2, and the distance between the fifth hinge center line C5 and the sixth hinge center line C6, respectively. See section 6 for the states. Figure 9 As shown, the purpose of this design is to control the seat cushion 10 to rotate within a small angle range relative to the base 50 during the switching between the sitting and reclining positions of the chair frame 100 of this utility model, thus preventing the seat cushion 10 from tilting excessively relative to the horizontal plane. More specifically, in Figure 6 and Figure 9In this example, the distance between the sixth hinge center line C6 and the second hinge center line C2 is equal to the distance between the fifth hinge center line C5 and the sixth hinge center line C6, but this is not a limitation. It should be noted that when the footrest 20 is hinged to the front end 11 of the seat cushion 10 on both the left and right sides, the base 50 and the connecting rod 60 are also arranged on the left and right sides respectively, to meet the need for the base 50 on the same side to be hinged to the corresponding side of the seat cushion 10, and the need for the connecting rod 60 on the same side to be hinged to the corresponding side of the backrest 30. Furthermore, a leg 93 located directly below the seat cushion 10 is connected to the base 50, so that the chair frame 100 of this invention can stand upright on the ground (floor).
[0043] like Figures 1 to 10 As shown, as an example, the footrest 20 includes a flip base 21 hinged to the front end 11 of the seat cushion 10 about a first hinge center line C1, a sliding bracket 22 slidably mounted on the flip base 21, and a linkage assembly 23 disposed between the sliding bracket 22 and the seat cushion 10. During the flipping of the flip base 21 relative to the seat cushion 10, the linkage assembly 23 drives the sliding bracket 22 to correspondingly extend or retract from the flip base 21. The state of the sliding bracket 22 extending from the flip base 21 is shown in [the diagram]. Figure 2 , Figure 3 , Figure 8 , Figure 9 and Figure 10 As shown, the sliding bracket 22 retracts and flips the base frame 21. Figure 1 , Figure 5 and Figure 7 As shown; when the chair frame 100 of this utility model is in a reclining position, the extension of the sliding support 22 relative to the flip base 21 increases the length of the footrest 20 for the user's feet, thus making the reclining position more comfortable. Specifically, in conjunction with Figures 5 to 10 As an example, the linkage assembly 23 includes a first rod 231, a second rod 232, a push-pull rod 233, and a flipping seat 234. The first rod 231 is hinged to the sliding bracket 22 and the second rod 232, respectively. The second rod 232 is also hinged to the flipping base 21, so that the flipping base 21, the first rod 231, the second rod 232, and the sliding bracket 22 together constitute a rocker-slider mechanism. The flipping seat 234 is flipped and connected to the seat cushion 10 around the flipping center line 235. The flipping center line 235 is parallel to the first hinge center line C1 to meet the need for the flipping seat 234 to flip along the front and rear direction of the seat cushion 10. The push-pull rod 233 is hinged to the flipping seat 234 and the second rod 232, respectively. Therefore, during the flipping process of the flipping seat 234 around the flipping center line 235, the push-pull rod 233 drives the second rod 232 to swing, thereby the swinging second rod 232 drives the sliding bracket 22 to extend or retract the flipping base 21 through the first rod 231. More specifically, at Figures 8 to 10 In this example, the second rod 232 is hinged to the right side of the flipping base 21. Obviously, it can also be hinged to the left side of the flipping base 21 as needed. The push-pull rod 233 is hinged to the middle of the second rod 232, and the first rod 231 is hinged to the middle of the sliding bracket 22. This design distributes the force driving the sliding bracket 22 to the middle of the sliding bracket 22, ensuring the uniformity of the force on the sliding bracket 22, thereby improving the smoothness of the sliding bracket 22's movement. In addition, a silent slide rail 24 is provided between the sliding bracket 22 and the flipping base 21. The silent slide rail 24 can be selected as a plastic slide rail made of POM (polyoxymethylene) to ensure that the sliding bracket 22 moves more smoothly, quietly, and with good self-lubrication relative to the flipping base 21. Alternatively, it can be... Figure 10 In the example, the silent slide rails 24 are three spaced apart from each other, and the push-pull rod 232 adopts a fisheye structure and is hinged to the middle of the second rod 232. This design ensures smooth movement and saves space.
[0044] In order to facilitate the reset of the footrest 20, a cushion is provided for the user's head and to maintain posture, combined with Figures 1 to 6 and Figures 8 to 9 As an example, the chair frame 100 of this utility model also includes a headrest 70, a hinge 80, a spring 91, and a handle 92. The headrest 70 is assembled and connected to the backrest 30 via the hinge 80, allowing the headrest 70 to be angled relative to the backrest 30, thereby providing better support for the user's head. The spring 91 is located between the footrest 20 and the seat cushion 10, and is configured to cause the footrest 20 to fold in the folding direction. Optionally, [the spring 91 is located between the footrest 20 and the seat cushion 10]. Figure 8 In this example, the front end of spring 91 is attached to the hanging post 25 on the flip base 21 of footrest 20, and the rear end of spring 91 is mounted on seat cushion 10. Furthermore, springs 91 are arranged on the left and right sides to improve the smoothness and reliability of footrest 20's reset. Handle 92 is inserted into the rear end 12 of seat cushion 10 and the synchronous connecting rod 40 in the left-right direction. The rod 41 has an arc-shaped clearance hole 411 for handle 92 to pass through. Handle 92 can selectively lock or unlock the synchronous connecting rod 40, preventing the chair frame 100 from switching between a sitting and reclining position when locked, and allowing the chair frame 100 to switch between sitting and reclining positions when unlocked. It should be noted that the specific structures of hinge 80 and handle 92 are well known in the art and will not be described in detail here.
[0045] Referring to the accompanying drawings, the switching between the sitting and reclining positions of the chair frame 100 of this utility model will be described:
[0046] When the chair frame 100 of this utility model is adjusted to Figure 1 When in the seated position shown, the synchronous linkage 40 is locked by the handle 92, so that the seat cushion 10, backrest 30 and footrest 20 cannot be flipped. At this time, the angle α2 between the seat cushion 10 and the backrest 30 is 105 degrees, the angle α1 between the seat cushion 10 and the horizontal plane is 9 degrees, and the angle α3 between the seat cushion 10 and the footrest 20 is 40 degrees. In addition, the headrest 70 can be adjusted relative to the backrest 30 within a range of 40 degrees by means of the hinge 80.
[0047] When needed Figure 1 The chair frame 100 is adjusted to the indicated sitting position. Figure 2 When in the reclining position shown, the handle 92 is released by the synchronous linkage 40; then, the backrest 30 moves along... Figure 1 The clockwise rotation causes the footrest 20 to rotate along the synchronous linkage 40. Figure 1 While rotating clockwise, the seat cushion 10 is also driven along the connecting rod 60. Figure 1 Rotate clockwise until it becomes Figure 2 Until the state shown.
[0048] Among them, Figure 2 In this configuration, the angle α2 between the backrest 30 and the seat cushion 10 is 130 degrees; the angle α4 between the footrest 20 and the horizontal plane is 13 degrees; the footrest 20 can extend 145 mm; the angle α5 between the headrest 70 and the backrest 30 is 40 degrees, meaning the headrest 70 has been adjusted forward by 40 degrees; additionally, the angle α6 between the backrest 30 and the horizontal plane is 25 degrees. It should be noted that along the footrest 20... Figure 1 During the clockwise rotation process, the linkage component 23 also drives the sliding bracket 22 to extend and slide relative to the rotating base 21.
[0049] Compared with the prior art, by using the design of "the front tilting arm 42 extending tilted towards the front of the seat cushion 10 relative to the rod 41, and the rear tilting arm 43 extending tilted towards the rear of the seat cushion 10 relative to the rod 41, and the front tilting arm 42 and the rear tilting arm 43 being arranged with one facing upward and the other facing downward", on the one hand, the tilt of the rod 41 of the synchronous link 40 caused by the height difference between the third hinge center line C3 and the fourth hinge center line C4 can be reduced, so that the rod 41 of the synchronous link 40 can be inserted into the seat cushion 10 from the front and rear direction, thus ensuring that the chair frame 100 of this utility model is simpler; on the other hand, the swaying effect of the synchronous link 40 during the linkage between the backrest 30 and the footrest 20 is increased, so that the synchronous linkage between the backrest 30 and the footrest 20 is more sensitive and smooth.
[0050] The above-disclosed examples are merely preferred embodiments of the present utility model, intended to facilitate understanding and implementation by those skilled in the art. They should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model application are still within the scope of the present utility model.
Claims
1. A chair frame comprising a seat cushion, a footrest hinged to an anterior end of the seat cushion about a first hinging center line, and a backrest hinged to a posterior end of the seat cushion about a second hinging center line, the backrest being pivotable relative to the seat cushion in a fore-aft direction of the seat cushion, the footrest being pivotably deployable relative to the seat cushion in the fore-aft direction of the seat cushion, characterized in that, The chair frame further comprises a synchronous linkage for synchronously connecting the footrest and the backrest, the synchronous linkage having a linkage body arranged in the front-rear direction of the seat cushion, a front inclined arm connected to the linkage body and inclinedly arranged in the front direction of the seat cushion relative to the linkage body, and a rear inclined arm connected to the linkage body and inclinedly arranged in the rear direction of the seat cushion relative to the linkage body, one of the rear inclined arm and the front inclined arm being arranged upward and the other being arranged downward, the front inclined arm being hinged to the footrest about a third hinge center line, and the rear inclined arm being hinged to the backrest about a fourth hinge center line.
2. The chair frame of claim 1, wherein The arm length of the rear inclined arm is greater than the arm length of the front inclined arm, the linkage body is arranged in the seat cushion, and the rear inclined arm is arranged outside the seat cushion.
3. The chair frame of claim 1, wherein Thickened reinforcing structures are arranged at the corners between the linkage body and the front inclined arm and / or the corners between the linkage body and the rear inclined arm, and a downward positioning notch is further arranged at the corner between the linkage body and the rear inclined arm, and a positioning support column corresponding to the positioning notch is arranged on the backrest to support the synchronous linkage from below.
4. The chair frame of claim 1, wherein, The first hinge center line to the fourth hinge center line are parallel to each other, the distance between the first hinge center line and the second hinge center line is less than the distance between the fourth hinge center line and the third hinge center line, the distance between the first hinge center line and the second hinge center line is greater than the distance between the fourth hinge center line and the second hinge center line, and the distance between the fourth hinge center line and the second hinge center line is greater than the distance between the third hinge center line and the first hinge center line.
5. The chair frame of claim 1, wherein, A base and a connecting rod are further included, the connecting rod is hinged to the base about a fifth hinge center line, the connecting rod is further hinged to the backrest about a sixth hinge center line, and the seat cushion is hinged to the base about a seventh hinge center line, so that the base, the connecting rod, the backrest and the seat cushion jointly form a planar four-bar linkage mechanism, and the backrest is synchronously flipped relative to the base by the connecting rod during flipping relative to the seat cushion.
6. The chair frame of claim 5, wherein, The base is arranged in front of the backrest, the first hinge center line to the seventh hinge center line are parallel to each other, the fifth hinge center line is located behind the seventh hinge center line, the fifth hinge center line is further located in front of the second hinge center line, the sixth hinge center line is located above and in front of the second hinge center line, and the sixth hinge center line is further located above the fifth hinge center line; the distance between the seventh hinge center line and the second hinge center line is greater than the distance between the seventh hinge center line and the fifth hinge center line, and the distance between the seventh hinge center line and the fifth hinge center line is respectively greater than the distance between the sixth hinge center line and the second hinge center line and the distance between the fifth hinge center line and the sixth hinge center line.
7. The chair frame of claim 1, wherein, The footrest comprises a turnover base frame articulated on the front end of the seat cushion about the first articulation center line, a sliding support sliding on the turnover base frame, and a linkage assembly arranged between the sliding support and the seat cushion, the linkage assembly driving the sliding support to extend or retract the turnover base frame correspondingly during the turnover of the turnover base frame about the first articulation center line relative to the seat cushion.
8. The chair frame of claim 7, wherein, The linkage assembly comprises a first rod, a second rod, a push-pull rod, and a turnover seat, the first rod is articulated with the sliding support and the second rod respectively, the second rod is further articulated with the turnover base frame, so that the turnover base frame, the first rod, the second rod, and the sliding support jointly constitute a rocker slider mechanism; the turnover seat is articulated with the seat cushion about a turnover center line, the turnover center line is parallel to the first articulation center line, and the push-pull rod is articulated with the turnover seat and the second rod respectively.
9. The chair frame of claim 8, wherein, The second rod is articulated with the left side or the right side of the turnover base frame, the push-pull rod is articulated with the middle part of the second rod, and the first rod is articulated with the middle part of the sliding support; a mute sliding rail is arranged between the sliding support and the turnover base frame.
10. The chair frame of claim 1, wherein, Further comprising a headrest, a hinge, a spring, and a handle, the headrest is assembled and connected with the backrest by means of the hinge; the spring is arranged between the footrest and the seat cushion, and is configured to turn the footrest in the folding direction; the handle is arranged in the rear end of the seat cushion and the synchronous connecting rod in the left-right direction of the seat cushion, an arc-shaped avoiding long hole is formed in the rod body for the handle to pass through, and the handle can selectively lock or unlock the synchronous connecting rod.