Zero-gravity chair frame

Abstract

The utility model relates to the technical field of furniture provides a zero gravity chair frame, and zero gravity chair frame includes fixed seat, linkage and screw rod mechanism, and linkage is equipped with backrest structure and leg support structure, and screw rod mechanism sets up in fixed seat, and screw rod mechanism includes transmission screw rod, wherein, the leg support structure and fixed seat between being equipped with connecting rod structure, and connecting rod structure has first angle and second angle, at first angle, backrest structure and leg support structure draw together relative to fixed seat, at second angle, backrest structure and leg support structure unfold relative to fixed seat, and connecting rod structure supports leg support structure. By connecting rod structure bears the pressure in the up and down direction, thereby reduced transmission screw rod's stress. The above design is favorable to avoid transmission screw rod reciprocating extension and shortening in the horizontal rhythm process, solves the problem that backrest structure and leg support structure alternate up and down and swings, and reduces the noise, guarantees the overall stability when rhythm seat horizontal rhythm again, significantly promotes the experience.

Description

Technical Field

[0001] This utility model relates to the field of furniture technology, and in particular to a zero-gravity chair frame. Background Technology

[0002] In the technology of rhythmic furniture such as zero-gravity rhythmic chairs, lead screw mechanisms are often used to drive the backrest and leg rest to flip up and down, thus switching between their folded and unfolded states.

[0003] During horizontal reciprocating motion, the inherent axial clearance of the lead screw mechanism (i.e., the movement clearance of the lead screw along the axial direction) and the inherent clearance of the threaded fit between the lead screw and the sleeve can cause specific problems. When the rhythmic seat is subjected to horizontal vibration excitation and the lead screw is in a non-driven state (i.e., stationary), the pressure generated by the backrest and leg rest during the up-and-down flipping and opening process significantly affects the lead screw, causing it to reciprocately elongate and shorten under inertia. This phenomenon not only shortens the service life of the lead screw but also causes alternating up-and-down tilting between the leg rest and backrest. Its impact is mainly reflected in two aspects: first, it causes structural noise; second, it disrupts the stability of the purely horizontal rhythmic motion of the rhythmic seat, thereby reducing the user experience. Utility Model Content

[0004] This utility model provides a zero-gravity chair frame to solve the problem in the prior art where the gap between the lead screw and the screw sleeve causes inertial movement under pressure, resulting in the backrest and leg rest tilting up and down alternately, generating noise and affecting the smoothness and comfort of the rhythm.

[0005] This utility model provides a zero-gravity chair frame, comprising: Fixed base; A linkage mechanism is rotatably mounted on the fixed base. One end of the linkage mechanism is provided with a backrest structure, and the opposite end of the linkage mechanism is provided with a leg support structure. A lead screw mechanism is provided on the fixed base, and the lead screw mechanism includes a telescopic transmission lead screw; The leg support structure and the fixed base are provided with a connecting rod structure. The connecting rod structure has a first angle and a second angle. One end of the connecting rod structure is connected to the fixed base and the other end is connected to the leg support structure. The transmission screw is connected to the connecting rod structure to enable the connecting rod structure to switch between the first angle and the second angle. At the first angle, the backrest structure and the leg support structure are close to the fixed seat; At the second angle, the backrest structure and the leg support structure are unfolded relative to the fixed base, and the linkage structure supports the leg support structure.

[0006] According to the zero-gravity chair frame provided by this utility model, the linkage structure includes: The first link has one end rotatably connected to the leg support structure; The second connecting rod has one end rotatably connected to the fixed base, and the other end rotatably connected to the first connecting rod. The second connecting rod is connected to the transmission screw. The first link can follow the movement of the second link so that there is a first angle and a second angle between the first link and the second link; At the second angle, the rotational connection between the first link and the leg support structure, the rotational connection between the second link and the fixed base, and the rotational connection between the first link and the second link are all on the same straight line.

[0007] According to the present invention, a zero-gravity chair frame is provided, wherein the second connecting rod is rotatably connected to the transmission lead screw; The rotational connection between the second connecting rod and the transmission lead screw has a first projection on the horizontal plane, the rotational connection between the second connecting rod and the fixed seat has a second projection on the horizontal plane, and the rotational connection between the first connecting rod and the second connecting rod has a third projection on the horizontal plane. The first projection is located between the second projection and the third projection.

[0008] According to the present invention, a zero-gravity chair frame is provided, the zero-gravity chair frame further includes a first support structure, the first support structure is disposed on the fixed base, and the first support structure is correspondingly disposed with the backrest structure; The linkage mechanism is provided with an abutting structure, which is located close to the backrest structure. At the second angle, the abutting structure abuts against the first support structure.

[0009] According to the zero-gravity chair frame provided by this utility model, the first support structure includes a support platform, which is disposed on the upper side of the fixed base; The abutment structure includes a rotating component, which is rotatably connected to the linkage mechanism.

[0010] According to the present invention, a zero-gravity chair frame is provided, wherein there are two support platforms, and the two support platforms are spaced apart on the upper side of the fixed base; There are two rotating components, which are located on opposite sides of the linkage mechanism.

[0011] According to the present invention, a zero-gravity chair frame is provided, the zero-gravity chair frame further includes a second support structure, the second support structure is disposed on the fixed base, and the second support structure is correspondingly disposed with the leg support structure; At the first angle, the leg support structure abuts against the second support structure.

[0012] According to the present invention, a zero-gravity chair frame is provided, wherein the second support structure includes two support columns, which are spaced apart on the upper side of the fixed base.

[0013] According to the zero-gravity chair frame provided by this utility model, the linkage mechanism has an extended state and a retracted state. When the backrest structure and the leg support structure are extended relative to the fixed seat, the linkage mechanism is in an extended state; when the backrest structure and the leg support structure are brought closer to the fixed seat, the linkage mechanism is in a retracted state.

[0014] According to the present invention, a zero-gravity chair frame is provided, wherein the linkage mechanism includes two sets of rod assemblies spaced apart from the fixed seat, the rod assembly including a first rod, a second rod, a third rod and a fourth rod, the first rod and the second rod being arranged opposite to each other, the third rod and the fourth rod being arranged opposite to each other, and the middle part of the first rod being rotatably connected to the fixed seat; The backrest structure is located at one end of the first rod, the leg support structure is located at the other end of the first rod, one end of the third rod is rotatably connected to one end of the first rod, the other end of the third rod is rotatably connected to one end of the second rod, one end of the fourth rod is rotatably connected to the other end of the first rod, and the other end of the fourth rod is rotatably connected to the other end of the second rod. The fixed base is provided with a limiting plate. One end of the limiting plate is rotatably connected to the fourth rod, and the other end is rotatably connected to the fixed base. The rotation connection point between the first rod and the fixed base is higher than the rotation connection point between the fourth rod and the limiting plate, so that the linkage mechanism is inclinedly arranged above the fixed base.

[0015] The zero-gravity chair frame provided by this utility model, through the addition of a linkage structure, converts the linear motion of the transmission screw into angular switching of the linkage structure, thereby realizing the posture conversion and locking of the leg support structure and the backrest structure. When the linkage structure is in the second angle, it forms a rigid support to maintain the extended state of the leg support structure, with the linkage structure mainly bearing the vertical pressure, thus reducing the force on the transmission screw. The above design helps to avoid the reciprocating extension and shortening of the transmission screw during horizontal rhythmic movement, thereby solving the problem of alternating up-and-down tilting of the backrest structure and the leg support structure, reducing noise, and ensuring the overall stability of the rhythmic chair during horizontal rhythmic movement, significantly improving the user experience. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of the zero-gravity chair frame provided by this utility model.

[0018] Figure 2 This is a structural schematic diagram of the first angle of the connecting rod structure provided by this utility model.

[0019] Figure 3 This is a schematic diagram of the second angle of the connecting rod structure provided by this utility model.

[0020] Figure 4 This is a structural schematic diagram of the percussion motor core and the zero-gravity chair frame provided by this utility model.

[0021] Figure 5 This is an exploded view of the vibration motor core and zero-gravity chair frame provided by this utility model.

[0022] Figure label: 100. Fixing base; 110. Limiting plate; 200. Linkage mechanism; 210. Rod assembly; 211. First rod; 212. Second rod; 213. Third rod; 214. Fourth rod; 300, Backrest structure; 310, Backrest frame; 400, Leg support structure; 410, Connecting bracket; 420, Leg support frame; 430, First connecting plate; 440, Second connecting plate; 500. Lead screw mechanism; 510. Transmission lead screw; 600. Linkage structure; 610. First link; 620. Second link; 710. First support structure; 711. Support platform; 720. Abutment structure; 721. Support platform; 721. Rotating component; 730. Second support structure; 731. Support column; 800. Rhythm motor core; 810. Fixed base frame; 820. Rhythm support; 830. Drive mechanism. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] The following is combined Figures 1-5 This invention describes a zero-gravity chair frame. In this embodiment, the zero-gravity chair frame is applied to rhythmic furniture, with rhythmic furniture being used as an example of a rhythmic chair. The rhythmic chair includes a rhythmic core 800, a zero-gravity chair frame mounted on the rhythmic core 800, and a sofa upholstery panel fitted onto the zero-gravity chair frame.

[0025] Understandably, referring to Figures 1 to 3 This utility model provides a zero-gravity chair frame, including a fixed base 100, a linkage mechanism 200 and a screw mechanism 500. The linkage mechanism 200 is rotatably mounted on the fixed base 100. One end of the linkage mechanism 200 is provided with a backrest structure 300, and the other end of the linkage mechanism 200 is provided with a leg support structure 400. The lead screw mechanism 500 is mounted on the fixed base 100, and the lead screw mechanism 500 includes a telescopic transmission lead screw 510; A connecting rod structure 600 is provided between the leg support structure 400 and the fixed base 100. The connecting rod structure 600 has a first angle and a second angle. One end of the connecting rod structure 600 is connected to the fixed base 100, and the other end is connected to the leg support structure 400. The transmission screw 510 is connected to the connecting rod structure 600 to enable the connecting rod structure 600 to switch between the first angle and the second angle. At a first angle, the backrest structure 300 and the leg support structure 400 are close to the fixed seat 100; at a second angle, the backrest structure 300 and the leg support structure 400 are extended relative to the fixed seat 100, and the connecting rod structure 600 supports the leg support structure 400.

[0026] The zero-gravity chair frame provided by this utility model, by adding a connecting rod structure 600, converts the linear motion of the transmission screw 510 into angular switching of the connecting rod structure 600, thereby realizing the posture conversion and locking of the leg support structure 400 and the backrest structure 300. When the connecting rod structure 600 is at the second angle, it forms a rigid support to maintain the extended state of the leg support structure 400. The connecting rod structure 600 mainly bears the vertical pressure, thereby reducing the force on the transmission screw 510. The above design helps to avoid the reciprocating extension and shortening of the transmission screw 510 during horizontal rhythmic movement, thus solving the problem of alternating up-and-down tilting of the backrest structure 300 and the leg support structure 400, reducing noise, and ensuring the overall stability of the rhythmic chair during horizontal rhythmic movement, significantly improving the user experience.

[0027] Understandably, referring to Figure 4 and Figure 5 In some examples of this utility model, the rhythmic core 800 includes a fixed base 810, a rhythmic support 820, and a drive mechanism 830. The rhythmic support 820 is movably mounted on the fixed base 810, and the drive mechanism 830 is mounted on the fixed base 810. The power output end of the drive mechanism 830 is connected to the rhythmic support 820 to drive the rhythmic support 820 to reciprocate relative to the fixed base 810. The fixed seat 100 is fixedly connected to the rhythmic support 820.

[0028] It should be noted that in some examples of this utility model, the above-mentioned rhythmic furniture has three rhythmic modes, which can be understood as multi-dimensional rhythm, such as: left-right rhythm alone, front-back rhythm alone, or left-right rhythm combined with front-back rhythm.

[0029] By configuring the rhythmic support 820 as a relatively fixed base 810, it can rhythmically move forward and backward and / or left and right. The left-right and forward / backward movements can be freely switched, and the switching is convenient. The structure is simple and low-cost, providing users with a more comprehensive health experience: First, multi-dimensional rhythmic movement can deeply stimulate various organs and tissues, significantly improving blood circulation efficiency; second, the composite rhythmic mode can more effectively promote lymphatic drainage and gastrointestinal motility; third, the bidirectional switching motion design avoids fatigue from single-direction movement, making the rhythmic process more comfortable and natural. Different directions of rhythmic movement produce differentiated tactile feedback, which not only enriches the user experience but also specifically meets the user's personalized health needs, qualitatively improving both the functionality and comfort of the rhythmic furniture.

[0030] It should be noted that the aforementioned lead screw mechanism 500 also includes a power motor and a screw sleeve. The power motor drives the screw sleeve to rotate, and the screw sleeve rotates relative to the transmission lead screw 510. The transmission lead screw 510 serves as the power output end of the lead screw mechanism 500 and is in transmission cooperation with the connecting rod structure 600 to enable the connecting rod structure 600 to switch angles.

[0031] Of course, in some other examples, the power motor drives the transmission screw 510 to rotate, the screw rotates relative to the threaded sleeve, and the threaded sleeve, as the power output end of the screw mechanism 500, is in transmission cooperation with the linkage mechanism 600.

[0032] Understandably, based on the second angle of the linkage structure 600, the transmission screw 510 and the threaded sleeve in the screw mechanism 500 are tightly fitted together. The transmission screw 510 and the threaded sleeve will not reciprocate due to the presence of a gap, i.e., reciprocating extension and shortening. This solves the problem of the backrest structure 300 and the leg support structure 400 alternating up and down tilting.

[0033] It is understood that in some examples of this utility model, the drive mechanism 830 includes a drive motor, a transmission crankshaft, a rocker arm, and an elastic transmission structure. The drive motor is mounted on a fixed base 810, and the transmission crankshaft is rotatably mounted on the fixed base 810. One end of the transmission crankshaft is connected to the output shaft of the drive motor via a pulley transmission assembly. One end of the rocker arm is provided with a connecting hole, through which the transmission crankshaft passes. The rotation center of the transmission crankshaft is eccentrically set with the center of the connecting hole. The other end of the rocker arm is connected to one end of the elastic transmission structure, and the other end of the elastic transmission structure is connected to the rhythmic bracket 820.

[0034] With the above structure, due to the eccentric design, the rotational motion generated by the drive motor is converted into eccentric motion, thereby generating a periodic torque on the transmission crankshaft, which causes the rhythm bracket 820 to reciprocate (back and forth or left and right) relative to the fixed base frame 810. The structure is compact and provides flexible, efficient and precise motion control.

[0035] Of course, in other examples, the drive mechanism 830 can also be magnetically driven, using a magnet and a coil. By changing the energization state of the coil, an attractive or repulsive force is generated between the coil and the magnet, thereby driving the rhythmic seat to move.

[0036] Understandably, referring to Figure 1 , Figure 4 and Figure 5 In some examples of this utility model, the linkage mechanism 200 has an extended state and a retracted state; When the backrest structure 300 and the leg support structure 400 are unfolded relative to the fixed seat 100, the linkage mechanism 200 is in an extended state; when the backrest structure 300 and the leg support structure 400 are brought closer to the fixed seat 100, the linkage mechanism 200 is in a retracted state.

[0037] With the above structure, the extension and retraction states of the linkage mechanism 200 directly correspond to the overall posture of the seat. When the linkage mechanism 200 extends, it drives the backrest and leg rest to unfold synchronously, providing the user with a comfortable seating experience; when it retracts, it drives both to move closer together, achieving a compact structure. This design ensures the synchronicity and consistency of the movement of the backrest structure 300 and the leg rest structure 400, not only optimizing the spatial layout but also simplifying the transmission chain by controlling two movements with a single mechanism, improving the reliability and response efficiency of the system, and enhancing the overall structural coordination and aesthetics.

[0038] Specifically, refer to Figure 1 , Figure 4 and Figure 5 In some examples of this utility model, the linkage mechanism 200 includes two sets of rod assemblies 210 spaced apart from the fixed base 100. The rod assembly 210 includes a first rod 211, a second rod 212, a third rod 213 and a fourth rod 214. The first rod 211 and the second rod 212 are arranged opposite to each other, and the third rod 213 and the fourth rod 214 are arranged opposite to each other. The middle part of the first rod 211 is rotatably connected to the fixed base 100. The backrest structure 300 is located at one end of the first rod 211, and the leg support structure 400 is located at the other end of the first rod 211; one end of the third rod 213 is rotatably connected to one end of the first rod 211, the other end of the third rod 213 is rotatably connected to one end of the second rod 212, one end of the fourth rod 214 is rotatably connected to the other end of the first rod 211, and the other end of the fourth rod 214 is rotatably connected to the other end of the second rod 212.

[0039] The leg support structure 400 is located at the front of the fixed base 100, and the backrest structure 300 is located at the rear of the fixed base 100. The transmission screw 510 of the screw mechanism 500 transmits power to the connecting rod structure 600, which precisely controls the relative angle changes of the first rod 211, the second rod 212, the third rod 213, and the fourth rod 214. This enables the leg support structure 400 and the backrest structure 300 to unfold and retract smoothly, effectively enhancing the lateral rigidity and stability of the mechanism during movement. It also significantly suppresses the swaying and noise that may be caused by horizontal rhythm, ensuring the reliability of the support and the accuracy of the movement.

[0040] Reference Figure 1 , Figure 4 and Figure 5In some examples of this utility model, the fixed base 100 is provided with a limiting plate 110. One end of the limiting plate 110 is rotatably connected to the fourth rod 214, and the other end is rotatably connected to the fixed base 100. The rotation connection point between the first rod 211 and the fixed base 100 is higher than the rotation connection point between the fourth rod 214 and the limiting plate 110, so that the linkage mechanism 200 is inclinedly arranged above the fixed base 100.

[0041] With the above configuration, the limiting plate 110, the fourth rod 214, and the fixed base 100 together form a stable tilting constraint mechanism. By setting the rotation connection point of the first rod 211 at a higher position, the entire linkage mechanism 200 is forced to be suspended above the fixed base 100 at a specific tilt angle.

[0042] It should be noted that there are two limiting plates 110, and the two limiting plates 110 are connected to the two fourth rods 214 in a one-to-one correspondence.

[0043] Understandably, referring to Figures 1 to 3 In some examples of this utility model, the linkage structure 600 includes a first linkage 610 and a second linkage 620. One end of the first linkage 610 is rotatably connected to the leg support structure 400 via a hinge shaft; one end of the second linkage 620 is rotatably connected to the fixed seat 100 via a hinge shaft, and the other end of the second linkage 620 is rotatably connected to the first linkage 610 via a hinge shaft. The second linkage 620 is also connected to the transmission screw 510 via a hinge shaft. The first link 610 can follow the movement of the second link 620 so that there is a first angle and a second angle between the first link 610 and the second link 620; Reference Figure 3 At the second angle, the rotational connection between the first link 610 and the leg support structure 400, the rotational connection between the second link 620 and the fixed seat 100, and the rotational connection between the first link 610 and the second link 620 are all on the same straight line.

[0044] Using the above structure, the stable deployment and locking of the leg support structure 400 are achieved through the combined movement of the first link 610 and the second link 620. When the three rotating connection points move to the same straight line (i.e., the second angle), the angle between the first link 610 and the second link 620 approaches 180 degrees, and the link structure 600 enters the pressure-bearing position. This position generates a self-locking effect, enabling the structure to withstand greater pressure from the leg support structure 400 while reducing the continuous pressure on the transmission screw 510. This effectively suppresses vibration-induced warping and noise, ensuring the stability of the seat's horizontal movement and overall quietness, while also reducing the impact of the transmission screw 510's movement clearance on the leg support structure 400 and the backrest structure 300.

[0045] Of course, in other examples, the linkage structure 600 is formed by two sets of cross-arranged links connected by a central shaft, resembling scissors. The extension and retraction of the lead screw 510 pushes the cross point to move, thereby controlling the extension and retraction of the linkage structure 600. When the linkage structure 600 is fully extended, its geometry tends to be stable, providing good vertical support and resisting the pressure from the leg support structure 400.

[0046] Understandably, referring to Figure 1 In some examples of this utility model, the second connecting rod 620 is rotatably connected to the transmission lead screw 510; The rotational connection between the second link 620 and the transmission screw 510 has a first projection on the horizontal plane, the rotational connection between the second link 620 and the fixed seat 100 has a second projection on the horizontal plane, and the rotational connection between the first link 610 and the second link 620 has a third projection on the horizontal plane. The first projection is located between the second projection and the third projection.

[0047] The above layout optimizes the force transmission path by placing the first projection of the hinge point between the transmission lead screw 510 and the second connecting rod 620 between the second projection of the hinge point of the fixed base 100 and the third projection of the hinge point of the two connecting rods. This design allows the thrust of the transmission lead screw 510 to be more effectively converted into the rotational torque of the second connecting rod 620, significantly reducing the driving force required for attitude switching and improving adjustment smoothness and efficiency. At the same time, this structure can still maintain reliable self-locking and support in the pressure position, balancing effort saving and stability.

[0048] Understandably, referring to Figure 1 and Figure 2 In some examples of this utility model, the zero-gravity chair frame also includes a first support structure 710, which is disposed on the fixed base 100 and is correspondingly disposed with the backrest structure 300. The linkage mechanism 200 is provided with an abutment structure 720, which is located close to the backrest structure 300. At a second angle, the abutment structure 720 abuts against the first support structure 710.

[0049] By adding a support structure and an abutment structure 720, rigid support is formed when the backrest structure 300 is flipped to a horizontal position (i.e., the linkage structure 600 is at the second angle). In the abutment state, the support structure directly supports the user's weight and effectively transfers it to the fixed seat 100. This design significantly reduces the mechanical load on the linkage mechanism 200 and the transmission screw 510, not only enhancing the overall structural stability but also helping to suppress vibration and noise and extend the service life of key components. Specifically, refer to Figure 1 and Figure 2In this embodiment, the first support structure 710 includes a support platform 711, which is disposed on the upper side of the fixed base 100; the abutment structure 720 includes a rotating member 721, which is rotatably connected to the linkage mechanism 200.

[0050] After the backrest structure 300 is flipped, the rotating component 721 presses against the support platform 711. Thanks to the rotatable design of the rotating component 721, it can adaptively adjust its angle at the moment of contact with the support platform 711, ensuring full contact between the contact surfaces, achieving uniform distribution of compressive stress, and avoiding local stress concentration. This design not only significantly reduces the load on the linkage mechanism 200 and the lead screw system, but also creates a stable force flow path within the mechanism, thereby greatly improving system rigidity, suppressing vibration and noise, and enhancing the fatigue durability of the structure. In addition, the rotating design makes the contact process smoother and gentler, which helps to improve the operational quality and user experience of the adjustment process.

[0051] It should be noted that in this embodiment, the rotating component 721 is a roller, which has a simple structure and low cost. Of course, the rotating component 721 can also be a rolling bearing, which consists of an inner ring, an outer ring, rolling elements, and a cage, resulting in stronger load-bearing capacity, lower rotational resistance, and longer service life. Using a roller or rolling bearing as the rotating component 721 achieves lower operating force, better smoothness, stronger wear resistance, and extremely quiet operation, comprehensively improving the product's premium feel and service life.

[0052] More specifically, refer to Figure 1 and Figure 2 In some examples of this utility model, there are two support platforms 711, which are spaced apart on the upper side of the fixed base 100; there are two rotating members 721, which are located on opposite sides of the linkage mechanism 200. With the above configuration, the double-sided support platform 711 effectively prevents the backrest structure 300 from deflecting or twisting when subjected to force, significantly enhancing the rigidity and load-bearing capacity of the overall structure. The user weight borne by the backrest structure 300 is evenly distributed to the two independent support platforms 711 through the two rotating parts 721, and finally symmetrically transmitted to the fixed seat 100. The above symmetrical force transmission path avoids stress concentration, making the force flow distribution more reasonable and the structure more reliable.

[0053] Of course, in other examples, the number of support platforms 711 can be set as needed, for example, the number of support platforms 711 can be determined according to the specific shape of the backrest structure 300.

[0054] Understandably, referring to Figure 1 , Figure 4 and Figure 5In some examples of this utility model, the zero-gravity chair frame also includes a second support structure 730, which is disposed on the fixed seat 100 and is correspondingly disposed with the leg support structure 400; at a first angle, the leg support structure 400 abuts against the second support structure 730.

[0055] With the above structure, when the leg support structure 400 is close to the fixed base 100, it abuts against the leg support structure 400 through the second support structure 730. The second support structure 730 is used to support the user's weight at the corresponding position. This can be understood as the weight of the user's lower leg or foot applied to the leg support being directly transferred to the fixed base 100 through the second support structure 730. This design helps extend the service life of the transmission screw 510, the connecting rod structure 600, and the hinge point.

[0056] Furthermore, regardless of whether the leg rest structure is extended or reclined, the seat possesses an independent rigid support path. This ensures that the seat maintains extremely high structural rigidity and overall stability in all postures, completely eliminating abnormal noises and wobbling caused by vibrations due to gaps between components.

[0057] The second support structure 730 provides clear mechanical limits and rigid support for the leg support structure 400, giving users a solid and reliable load-bearing experience, avoiding the "soft" or "uncertain" experience that pure mechanical suspension may bring, and enhancing the sense of security of the product.

[0058] Specifically, refer to Figure 1 , Figure 4 and Figure 5 In some examples of this utility model, the second support structure 730 includes two support columns 731, which are spaced apart on the upper side of the fixed base 100. The two support columns 731 together form a stable load-bearing plane, which can effectively distribute and bear the concentrated load from the leg support structure 400, prevent structural deformation or fatigue damage that may occur with single-point support, and significantly enhance the stability and durability of the overall structure.

[0059] More specifically, refer to Figure 1 , Figure 4 and Figure 5 In some examples of this utility model, the leg support structure 400 includes a connecting bracket 410, which is connected to the linkage mechanism 200 in a transmission manner; wherein, the connecting rod structure 600 is located in the middle of the connecting bracket 410. Specifically, the aforementioned connecting bracket 410 is connected to the third rod 213 in a transmission manner, which can be a fixed connection or a rotatable connection, as long as the movement of the connecting bracket 410 drives the movement of the linkage mechanism 200.

[0060] The lead screw mechanism 500 drives the connecting rod structure 600 to switch angles through the extension and retraction of the transmission lead screw 510. The movement of the connecting rod structure 600 is further transmitted to the connecting bracket 410, which in turn drives the linkage mechanism 200 to move, ultimately realizing the unfolding or folding of the leg support structure 400 and the backrest structure 300.

[0061] It should be noted that when the leg support structure 400 is brought together, the connecting bracket 410 abuts against the two supporting bodies.

[0062] Specifically, refer to Figure 4 In some examples of this utility model, the leg support structure 400 also includes a leg support frame 420, a first connecting plate 430 and a second connecting plate 440, wherein the leg support frame 420 is used to support the user's legs. The first connecting plate 430 is provided with a first connecting position and a second connecting position. The first connecting position is rotatably connected to the leg support body 420, and the second connecting position is rotatably connected to the third rod body 213. The second connecting plate 440 is provided with a third connecting position and a fourth connecting position. The third connecting position is rotatably connected to the first connecting plate 430, and the fourth connecting position is rotatably connected to the third rod body 213. The third connecting position is rotatably connected to the first connecting plate 430 between the first connecting position and the second connecting position.

[0063] It should be noted that, in this embodiment, in order to improve transmission stability, two first connecting plates 430 are provided at both ends of the leg support body 420.

[0064] With the above structure, the leg support structure 400 forms a compound rotational connection with the third link through the first connecting plate 430 and the second connecting plate 440, constituting a precise motion adjustment mechanism. By setting the hinge point between the second connecting plate 440 and the first connecting plate 430, i.e., the third connection position, between the first connection position and the second connection position, the force transmission path is effectively optimized. This layout enhances the posture stability of the leg support frame 420 during the unfolding and retraction process, can adaptively adjust the tilt angle to closely fit the leg curve, and effectively suppresses the impact and sway from the link structure 600, greatly improving load-bearing comfort and smooth movement.

[0065] Specifically, refer to Figure 1 , Figure 4 and Figure 5 In this embodiment, the backrest structure 300 includes two sets of backrest frames 310, which are connected one-to-one with the fourth rod 214 of the two sets of rod assemblies 210. The two support platforms 711 are arranged one-to-one with the two sets of backrest frames 310.

[0066] The load applied by the user to the backrest structure 300 is directly decomposed into two independent backrest frames 310-fourth rod 214-support platform 711 paths, and finally symmetrically transmitted to the fixed seat 100. This greatly optimizes the force flow distribution, avoids torsion or off-center loading caused by unilateral force, and significantly improves the stability and load-bearing capacity of the structure.

[0067] It should be noted that in some examples, the backrest structure 300 may also include a frame, and there may be one or two support platforms 711. When there is one support platform 711, the support platform 711 abuts against the middle of the frame, and the two support platforms 711 correspond to the opposite sides of the frame.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A zero-gravity chair frame, characterized in that, include: Fixture (100); A linkage mechanism (200) is rotatably mounted on the fixed base (100). One end of the linkage mechanism (200) is provided with a backrest structure (300), and the other end of the linkage mechanism (200) is provided with a leg support structure (400). A lead screw mechanism (500) is provided on the fixed base (100), and the lead screw mechanism (500) includes a telescopic transmission lead screw (510). A connecting rod structure (600) is provided between the leg support structure (400) and the fixed base (100). The connecting rod structure (600) has a first angle and a second angle. One end of the connecting rod structure (600) is connected to the fixed base (100), and the other end is connected to the leg support structure (400). The transmission screw (510) is connected to the connecting rod structure (600) so that the connecting rod structure (600) can switch between the first angle and the second angle. At the first angle, the backrest structure (300) and the leg support structure (400) are close to the fixed seat (100); At the second angle, the backrest structure (300) and the leg support structure (400) are deployed relative to the fixed base (100), and the linkage structure (600) supports the leg support structure (400).

2. The zero gravity chair frame of claim 1, wherein, The linkage structure (600) includes: The first link (610) is rotatably connected at one end to the leg support structure (400); The second link (620) has one end rotatably connected to the fixed base (100), and the other end rotatably connected to the first link (610). The second link (620) is connected to the transmission screw (510) in a transmission connection. The first link (610) can follow the movement of the second link (620) so that there is a first angle and a second angle between the first link (610) and the second link (620); At the second angle, the rotational connection between the first link (610) and the leg support structure (400), the rotational connection between the second link (620) and the fixed seat (100), and the rotational connection between the first link (610) and the second link (620) are all on the same straight line.

3. The zero gravity chair frame of claim 2, wherein, The second connecting rod (620) is rotatably connected to the transmission lead screw (510); The rotational connection between the second connecting rod (620) and the transmission screw (510) has a first projection on the horizontal plane, the rotational connection between the second connecting rod (620) and the fixed seat (100) has a second projection on the horizontal plane, and the rotational connection between the first connecting rod (610) and the second connecting rod (620) has a third projection on the horizontal plane. The first projection is located between the second projection and the third projection.

4. The zero-gravity chair frame according to claim 1, characterized in that, The zero-gravity chair frame also includes a first support structure (710), which is disposed on the fixed base (100) and is correspondingly disposed with the backrest structure (300); The linkage mechanism (200) is provided with an abutment structure (720), which is located close to the backrest structure (300). At the second angle, the abutment structure (720) abuts against the first support structure (710).

5. The zero-gravity chair frame of claim 4, wherein, The first support structure (710) includes a support platform (711), which is disposed on the upper side of the fixed base (100); The abutment structure (720) includes a rotating member (721), which is rotatably connected to the linkage mechanism (200).

6. The zero-gravity chair frame of claim 5, wherein, There are two support platforms (711), and the two support platforms (711) are spaced apart on the upper side of the fixed base (100); There are two rotating parts (721), and the two rotating parts (721) are located on opposite sides of the linkage mechanism (200).

7. The zero-gravity chair frame according to claim 1, characterized in that, The zero-gravity chair frame also includes a second support structure (730), which is disposed on the fixed base (100) and is correspondingly disposed with the leg support structure (400); At the first angle, the leg support structure (400) abuts against the second support structure (730).

8. The zero-gravity chair frame according to claim 7, characterized in that, The second support structure (730) includes two support columns (731), which are spaced apart on the upper side of the fixed base (100).

9. The zero-gravity chair frame according to any one of claims 1 to 8, characterized in that, The linkage mechanism (200) has an extended state and a retracted state. The backrest structure (300) and the leg support structure (400) are unfolded relative to the fixed seat (100), and the linkage mechanism (200) is in an extended state; the backrest structure (300) and the leg support structure (400) are brought closer to the fixed seat (100), and the linkage mechanism (200) is in a retracted state.

10. The zero-gravity chair frame according to claim 9, characterized in that, The linkage mechanism (200) includes two sets of rod assemblies (210) spaced apart from the fixed base (100). Each rod assembly (210) includes a first rod (211), a second rod (212), a third rod (213), and a fourth rod (214). The first rod (211) and the second rod (212) are arranged opposite to each other, and the third rod (213) and the fourth rod (214) are arranged opposite to each other. The middle part of the first rod (211) is rotatably connected to the fixed base (100). The backrest structure (300) is located at one end of the first rod (211), the leg support structure (400) is located at the other end of the first rod (211), one end of the third rod (213) is rotatably connected to one end of the first rod (211), the other end of the third rod (213) is rotatably connected to one end of the second rod (212), one end of the fourth rod (214) is rotatably connected to the other end of the first rod (211), and the other end of the fourth rod (214) is rotatably connected to the other end of the second rod (212). The fixed base (100) is provided with a limiting plate (110). One end of the limiting plate (110) is rotatably connected to the fourth rod (214), and the other end is rotatably connected to the fixed base (100). The rotation connection point between the first rod (211) and the fixed base (100) is higher than the rotation connection point between the fourth rod (214) and the limiting plate (110), so that the linkage mechanism (200) is inclinedly arranged above the fixed base (100).

Images