Seat and desk and chair

Abstract

The chair comprises a backrest, a seat frame and a base, the backrest is movably connected with the seat frame, the seat frame is directly connected with the base through a plurality of supporting legs, and the supporting legs can move in the length direction of the base; when a user sits upright, the supporting legs are located at one end of the base, and side projections of the seat frame, the base and the supporting legs define a C shape; when the user lies on the back, the supporting legs are located at the other end of the base, and the side projections of the seat frame, the base and the supporting legs define an inverted Z shape; the chair has two structural modes, so that the gravity center of a user can fall in the projection area of the base when the user sits upright or lies on the back, and the user is prevented from falling down due to the fact that the user forcibly lies on the back; the angle adjusting amplitude of the backrest and the movement of the supporting legs are associated and matched, and when the backrest is adjusted backwards, the supporting legs move towards one end of the base in a linkage mode at the same time, so that the gravity center can fall into the projection area of the base in the backward shifting process.

Description

Technical Field

[0001] The invention relates to the technical field of seating, in particular to a chair and a desk and chair. Background Art

[0002] Most of the existing desks and chairs for users are of fixed design, which means that users can only choose to crawl on the desk to rest during lunch break. This not only affects the quality of the user's lunch break, but also has an adverse effect on the user's physical development if they take a lunch break in a crawling posture for a long time.

[0003] For example, patent publication number CN220713417U discloses a desk and chair for users to take a lunch break, which turns the desk and chair into a supine position so that users can lie down and rest during lunch break. However, in the supine position, the entire center of gravity of the application is constantly shifted, so that the user is prone to tipping over backwards when lying down with force. For this reason, we propose a seat and a desk and chair for solving the above problem. Summary of the invention

[0004] The object of the present invention is to provide a chair and a desk and chair to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a chair, comprising a backrest, a seat frame, a base, a connecting rod connecting the backrest and the seat frame, and a supporting leg connecting the seat frame and the base, wherein the connecting rod is slidably connected to the backrest, the connecting rod can rotate around one end of the seat frame, the supporting leg can move on the base, the supporting leg can rotate around the bottom end of the base, a moving mechanism for driving the seat frame to move along the base is provided in the supporting leg, and a linkage mechanism for linking the backrest and the moving mechanism is provided in the seat frame; When sitting upright, the support leg is located at one end of the base, and the side projections of the seat frame, the base and the support leg form a C shape; When lying on one's back, the supporting leg is located at the other end of the base, and the side projections of the seat frame, the base and the supporting leg form an inverted Z shape.

[0006] Through the above technical solution, when sitting upright, the user's center of gravity is vertically on the seat frame, and the supporting leg is located at one end of the base. At this time, the side projections of the seat frame, base and supporting leg form a C shape, and the vertical projection of the user's center of gravity is just within the projection of the base. The desk and chair present a relatively stable structure, which is suitable for students to carry out normal learning and writing activities; when lying on your back, because the center of gravity of the user's body shifts back to the upper body of the human body during the process of lying down, in order to prevent the center of gravity from shifting outside the seat frame and thus tipping over, the user's seat frame will shift toward the other end during the process of lying on your back, so that the side projections of the seat frame, base and supporting leg form an inverted Z shape. In this state, the user's center of gravity is always within the projection surface of the seat frame. Secondly, the inverted Z-shaped structure allows the seat frame to move backwards, and the backrest can tilt backwards, providing students with a larger tilt angle and increasing comfort.

[0007] Preferably, the seat frame is provided with a first cavity, and the linkage mechanism includes a rotating shaft rotatably connected to the seat frame and arranged in the first cavity, a damping module abutting the rotating shaft, a limiting module limiting the rotation of the rotating shaft, and a second steel rope with one end fixedly connected to the connecting rod, the rotating shaft is fixedly connected to the connecting rod, a torsion spring is provided on the rotating shaft, one end of the torsion spring is connected to the rotating shaft, and the other end is connected to the inner wall of the first cavity, the torsion spring forces the rotating shaft to rotate axially, the second steel rope passes through the seat frame and the supporting leg, and the other end of the second steel rope is connected to the moving mechanism.

[0008] Through the above technical solution, the damping module provides a certain resistance to the rotation of the rotating shaft. This resistance can make the rotation of the rotating shaft more stable and avoid sudden rapid rotation, thereby improving the stability and safety of the desks and chairs during use; the limit module can lock the rotating shaft through a mechanical structure or other means to ensure that the desks and chairs can maintain a stable state when needed; the second steel rope plays a role in transmitting power in the linkage mechanism. When the connecting rod moves, the force is transmitted to the moving mechanism through the second steel rope, thereby realizing the movement of the seat frame on the base and the linkage between the backrest and the seat frame; the linkage mechanism in the seat frame realizes the linkage between the backrest and the seat frame and the movement of the seat frame on the base through the coordinated action of components such as the rotating shaft, the damping module, the limit module, the torsion spring and the second steel rope.

[0009] Preferably, the damping module includes a first sliding column fixedly connected to the seat frame and arranged in the first cavity, a clamping block slidably connected to the first sliding column, a first steel rope fixedly connected to the clamping block, and an adjustment assembly arranged on the supporting leg, the tension applied to the clamping block by the first steel rope is toward the rotating shaft, and the other end of the first steel rope is connected to the adjustment assembly.

[0010] Through the above technical solution, when the shaft rotates, the pressing block generates friction in contact with the shaft, thereby playing a damping role. This friction can slow down the rotation speed of the shaft, making the adjustment process of the desks and chairs smoother and more controllable. For example, when the user adjusts the backrest angle, the pressing block can prevent the backrest from rotating too quickly through friction with the shaft, avoiding discomfort or accidents to the user.

[0011] Preferably, the adjustment assembly includes a force-bearing rod rotatably connected to the end of the supporting leg, the force-bearing rod is fixedly connected to the seat frame, the end of the force-bearing rod away from the supporting leg is movably connected to a force transmission rod, a slider is slidably connected to the supporting leg, the slider is rotatably connected to one end of the force transmission rod, the slider is connected to the clamping block by a first steel rope, the first steel rope runs through the seat frame, a second sliding column is provided on the side of the supporting leg, the second sliding column is slidably connected to the slider, a first spring is sleeved on the second sliding column, and the first spring is arranged between the slider and a fixed block at one end of the second sliding column.

[0012] Through the above technical solution, the force of the seat frame can be transmitted to the slider through the force-bearing rod. The elastic force of the first spring is relatively large. On the one hand, the first spring buffers the movement of the slider over a small distance, and on the other hand, it can transmit the force exerted on the slider to the supporting leg. When the seat frame is under pressure, the slider will slide downward, and the clamping block will be pulled by the first steel rope to increase the pressure of the clamping block on the rotating shaft, thereby increasing the damping effect.

[0013] Preferably, the limit module comprises a button block with an end portion passing through the side surface of the seat frame, a fourth gear fixedly connected to the rotating shaft, and a limit tooth fixedly connected to the button block, the inner wall of the first cavity is provided with a first slide groove passing through the side surface of the seat frame, the button block passing through the side surface of the seat frame is slidably connected in the first slide groove, a return spring is provided between the button block and the inner wall of the first slide groove, and the return spring forces the button block to move outward; When the button block is in a non-pressed state, the limiting tooth is meshed with the fourth gear; When the button block is in a pressed state, the limiting tooth is disengaged from the fourth gear; When the button block rebounds, the button block, under the action of the return spring, causes the limiting tooth to mesh with the fourth gear again.

[0014] Through the above technical solution, when the button block is not pressed, the reset spring causes the limit tooth to mesh with the fourth gear, limiting the rotation of the shaft to keep the desks and chairs stable in a specific state. After the button block is pressed, the limit tooth is disengaged from the fourth gear, the rotation restriction of the shaft is released, and the state of the desks and chairs can be adjusted. When the button block is released, the reset spring causes the button block to rebound, and the limit tooth re-engages with the fourth gear to ensure that the desks and chairs are stable in the new state.

[0015] Preferably, the supporting leg is provided with a second cavity, and the moving mechanism includes a mounting plate fixedly connected to the second cavity, the mounting plate divides the second cavity into a first area and a second area, the first area is connected to the compression cavity, a compression block is slidably connected to the interior of the compression cavity, the compression block passes through the compression cavity, a second spring is provided between the compression block and the interior of the compression cavity, the second spring forces the compression block to move toward the base, the end of the compression block is rotatably connected to the first gear, and the connecting rod is connected to one end of the compression block by a second steel rope.

[0016] Through the above technical solution, when the user adjusts the backrest angle or the seat frame position, the movement of the connecting rod is transmitted to the compression block through the second steel rope, which may cause the compression block to move in the compression chamber, and then drive other parts of the desk and chair to make corresponding adjustments through the first gear and other components; the mounting plate divides the second chamber into different areas, so that each component can play a role in a specific area. At the same time, the mounting plate also provides a basis for fixing and installing other components.

[0017] Preferably, a first rack is fixedly mounted on one side of the first gear, and the other side is slidably connected to a second rack of the first area, and the first gear is meshed with the first rack and the second rack respectively; A through slot is provided on the mounting plate, and a transmission column penetrating the through slot is fixedly connected to the end of the second rack, and the transmission column is arranged in the through slot; The transmission column is rotatably connected to the second gear, one side of the second gear is fixedly connected to the third rack, and the other side is slidably connected to the fourth rack of the second area, and the second gear is meshed with the third rack and the fourth rack.

[0018] Through the above technical solution, the gears and racks in the first zone and the second zone constitute a stroke amplification mechanism. The first gear in the first zone is pushed forward, and under the action of the third rack, the first gear rotates. The rotating first gear pushes the second rack to move. At this time, the moving speed of the second rack is greater than the moving speed of the first gear, thereby realizing the amplification of the stroke. Similarly, the gears and racks in the second zone are secondary amplification of the stroke, which amplifies the short-distance movement of the backrest.

[0019] Preferably, the end of the support leg is rotatably connected to a third gear, and a third sliding column is fixedly connected inside the base. One end of the support leg is sleeved on the third sliding column, and the third sliding column is provided with a plurality of teeth and grooves, and the third gear is meshed with the teeth and grooves.

[0020] Through the above technical solution, when the desk and chair switch from the sitting position to the lying position, the support leg needs to move and rotate on the base. At this time, the engagement of the third gear and the tooth groove can ensure the accurate movement trajectory of the support leg, and also prevent the support leg from shaking or shifting during the movement. In addition, this design can also increase the stability of the desk and chair in different use states, and improve the safety and comfort of the user.

[0021] Preferably, the second cavity is provided with a transmission mechanism for driving the third gear to rotate, and the transmission mechanism is connected to the fourth rack.

[0022] Through the above technical solution, the movement of the fourth rack can be transmitted to the third gear through the transmission mechanism, so as to realize the movement control of the support leg on the base. When the fourth rack moves, it will drive the conveyor belt or chain connected thereto to move. Since the conveyor belt or chain is connected to the third gear through the transmission mechanism, their movement will drive the third gear to rotate.

[0023] A desk and chair comprises a seat.

[0024] Compared with the prior art, the present invention has the following beneficial effects: The present application has two structural modes, which can respectively enable the center of gravity of the user to fall within the projection area of ​​the base when the user is sitting upright or lying on his back, thereby preventing the user from leaning back and causing tipping.

[0025] 2. The design of the linkage mechanism and moving mechanism of the present application enables the backrest, seat frame and supporting legs to work together to achieve easy adjustment of the status of the desks and chairs; the damping module provides resistance for the rotation of the shaft, making the adjustment process smoother and more controllable, avoiding discomfort or accidents caused by sudden and rapid rotation; the limit module can lock the shaft to ensure that the desks and chairs remain stable when needed, and at the same time, the lock can be easily released and restored through button operation to meet different usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional schematic diagram of the present invention; Figure 2 This is a schematic diagram of the linkage mechanism structure in Example 1 of the present invention; Figure 3 This is a schematic diagram of the structure of the damping module in Example 1 of the present invention; Figure 4 This is a schematic diagram of the structure of the adjustment component in Example 1 of the present invention; Figure 5 This is a schematic diagram of the structure of the limit module in Example 1 of the present invention; Figure 6 This is a schematic diagram of the structure of the moving mechanism in Example 1 of the present invention; Figure 7 This is a schematic diagram of the interior of the first zone in Example 1 of the present invention; Figure 8 This is a schematic diagram of the internal structure of the base in Example 1 of the present invention; Fig. 9 This is a schematic diagram of the transmission mechanism structure in Example 1 of the present invention; Fig.10It is a side view schematic diagram of the structure of the present invention in an upright state; Fig.11 It is a schematic side view of the structure of the present invention in a supine position.

[0027] In the figure: 1, backrest; 2, connecting rod; 3, seat frame; 4, supporting leg; 41, supporting part; 42, sleeve part; 5, base; 51, third sliding column; 52, tooth groove; 6, linkage mechanism; 61, first cavity; 62, rotating shaft; 63, torsion spring; 64, limit module; 641, first slide groove; 642, button block; 643, return spring; 644, fourth gear; 645, limit tooth; 65, damping module; 651, first sliding column; 652, pressing block; 66, first steel rope; 67, second steel rope; 68, adjustment assembly; 681, force rod; 682, force transmission rod; 683, second sliding column; 684, first spring ;685, slider;7, moving mechanism;71, first zone;711, compression chamber;712, second spring;713, compression block;714, first gear;715, second rack;716, first rack;717, second slide groove;72, second zone;73, first stroke amplification module;74, second stroke amplification module;741, third rack;742, fourth rack;743, second gear;744, transmission column;745, third slide groove;75, mounting plate;751, through groove;76, transmission mechanism;761, directional wheel;762, chain;77, third gear;78, driving wheel;8, leg rest;9, head rest. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1, reference Figure 1 and Figure 2A desk and chair comprises a desk and a chair, the chair comprises a backrest 1, a seat frame 3, a base 5, a leg rest 8, a connecting rod 2 connecting the backrest 1 and the seat frame 3, a head rest 9 slidably connected to the back side of the backrest 1, a supporting leg 4 connecting the seat frame 3 and the base 5, a moving mechanism 7 arranged in the supporting leg 4, and a linkage mechanism 6 arranged in the seat frame 3, the connecting rod 2 is slidably connected to the backrest 1, the user adjusts the height of the backrest 1 and the height of the head rest 9 according to his / her own height, so that the user can lie down in a more comfortable state, the top end of the supporting leg 4 is rotatably connected to the bottom of the seat frame 3, the seat frame 3 can rotate slightly around the top end of the supporting leg 4, the linkage mechanism 6 associates the rotation of the backrest 1 with the moving mechanism 7, the rotation of the backrest 1 is transmitted through the linkage mechanism 6, so that the moving mechanism 7 drives the supporting leg 4 to move on the base 5.

[0030] refer to Figure 2 , a first cavity 61 is provided in the seat frame 3, the linkage mechanism 6 includes a rotating shaft 62 rotatably connected to the seat frame 3 and arranged in the first cavity 61, a damping module 65 abutting against the rotating shaft 62, a limiting module 64 for limiting the rotation of the rotating shaft 62, and a second steel rope 67 fixedly connected to the connecting rod 2 at one end, the second steel rope 67 passes through the seat frame 3 and the end of the supporting leg 4, the second steel rope 67 is connected to the moving mechanism 7, and the moving mechanism 7 is linked by the second steel rope 67. The rotating shaft 62 is provided with a torsion spring 63, one end of the torsion spring 63 is connected to the rotating shaft 62, and the other end is connected to the first cavity The torsion spring 63 forces the rotating shaft 62 to rotate axially, and the torsion spring 63 provides a steering force for the rotating shaft 62 to return to its original position; the damping module 65 can automatically adjust the damping effect on the rotating shaft 62 according to the gravity of the user. When the user with a heavier weight uses it, the seat frame 3 rotates around the supporting leg 4 with a larger amplitude. The damping module 65 increases the damping effect on the rotating shaft 62 to prevent the backrest 1 from rotating too quickly, thereby avoiding discomfort or accidents to the user; when the backrest 1 is rotated and adjusted to a suitable angle, the position of the rotating shaft 62 at that time is locked by the limit module 64.

[0031] refer to Figure 3 The damping module 65 includes a first sliding column 651 fixedly connected to the seat frame 3 and arranged in the first cavity 61, a clamping block 652 slidably connected to the first sliding column 651, a first steel rope 66 fixedly connected to the clamping block 652, and an adjusting assembly 68 arranged on the supporting leg 4. The clamping block 652 is located above the rotating shaft 62. The clamping block 652 applies a damping effect to the rotating shaft 62 through friction. The first steel rope 66 is connected to the adjusting assembly 68. The adjusting assembly 68 can apply different tensions to the first steel rope 66. The pressure applied by the first steel rope 66 to the clamping block 652 is toward the rotating shaft 62.

[0032] refer to Figure 4The adjusting assembly 68 includes a force-bearing rod 681 rotatably connected to the top of the supporting leg 4, a force-transmitting rod 682 rotatably connected to the end of the force-bearing rod 681, a second sliding column 683 fixedly connected to the side of the supporting leg 4, a slider 685 slidably connected to the second sliding column 683, and a first spring 684 sleeved on the second sliding column 683. The end of the force-transmitting rod 682 is rotatably connected to the slider 685, and one side of the force-bearing rod 681 is fixedly connected to the seat frame 3. The supporting leg 4, the force-bearing rod 681, the force-transmitting rod 682 and the slider 685 constitute a four-bar mechanism. When the seat frame 3 is subjected to pressure or other external forces, the force-bearing rod 681 can transfer the force The force is transmitted to the slider 685 through the force transmission rod 682, so that the slider 685 slides on the support leg 4. The slider 685 moves at different distances depending on the force. The first steel rope 66 is fixedly connected to the slider 685. When the slider 685 slides, the pressing block 652 is pulled by the first steel rope 66, changing the pressure of the pressing block 652 on the rotating shaft 62. On the one hand, the first spring 684 can buffer the movement of the slider 685 to prevent the sudden movement of the slider 685 from causing impact on the desks and chairs. On the other hand, the first spring 684 can transmit the force received by the slider 685 to the support leg 4, participating in the overall force balance of the desks and chairs. When the force on the seat frame 3 changes, the compression or extension of the first spring 684 can adapt to the position change of the slider 685, providing a certain elastic support for the desks and chairs.

[0033] refer to Figure 5 The limiting module 64 includes a button block 642 whose end is penetrated through the side of the seat frame 3, a fourth gear 644 fixedly connected to the rotating shaft 62, and a limiting tooth 645 fixedly connected to the button block 642. The inner wall of the first cavity 61 is provided with a first slide groove 641 penetrating the side of the seat frame 3. The first slide groove 641 is fixedly connected to the button block 642. One end of the button block 642 penetrates the side of the seat frame 3. A return spring 643 is provided on the inner wall of the button block 642 and the first slide groove 641. The return spring 643 forces the button block 642 to move toward the outside. The limiting tooth 645 is located in the first cavity 61. Different positions of the limiting tooth 645 have different connection relationships with the fourth gear 644. When the button block 642 is not pressed, the limiting tooth 645 is meshed with the fourth gear 644, and the limiting tooth 645 limits the rotation of the fourth gear 644, so that the backrest 1 is locked at a certain angle; When the button block 642 is in a pressed state, the limiting tooth 645 is disengaged from the fourth gear 644, and the restriction of the fourth gear 644 is released, so that the angle of the backrest 1 can be adjusted; When the button block 642 is released, the button block 642 is acted upon by the return spring 643 so that the limiting tooth 645 re-engages with the fourth gear 644 .

[0034] refer to Figure 6 and Figure 8The support leg 4 is provided with a second cavity, and the moving mechanism 7 includes a mounting plate 75 fixedly connected to the second cavity, a first stroke amplification module 73 and a second stroke amplification module 74 arranged in the second cavity, a third gear 77 rotatably connected to the bottom end of the support leg 4, a driving wheel 78 fixedly connected to the third gear 77, and a transmission mechanism 76 for driving the driving wheel 78 to rotate. The mounting plate 75 divides the second cavity into a first area 71 and a second area 72. The first stroke amplification module 73 is arranged in the first area 71, and the second stroke amplification module 74 is arranged in the second area 72. The output end of the first stroke amplification module 73 is connected to the input end of the second stroke amplification module 74; the second steel rope 67 is connected to the input end of the first stroke amplification module 73, and the rotation of the backrest 1 tightens the second steel rope 67, so that the input end of the first stroke amplification module 73 Movement, the short-distance movement of the rotation of the backrest 1 is amplified by the first stroke amplification module 73 and the second stroke amplification module 74, so that the movement of the output end of the second stroke amplification module 74 can meet the demand of the support leg 4 to move on the base 5; the output end of the second stroke amplification module 74 is connected to the transmission mechanism 76, and the output end of the second stroke amplification module 74 drives the driving wheel 78 to rotate through the transmission mechanism 76, thereby driving the third gear 77 to rotate; the third sliding column 51 is fixedly connected to the base 5, one end of the support leg 4 is sleeved on the third sliding column 51, and the third sliding column 51 is provided with a plurality of tooth grooves 52, and the third gear 77 is meshed with the tooth groove 52. Since the third gear 77 is meshed with the tooth groove 52, the third gear 77 can move on the third sliding column 51, thereby moving the support leg 4 on the base 5.

[0035] refer to Figure 7 The first zone 71 is connected to a compression chamber 711, and the first stroke amplification module 73 includes a compression block 713 slidably connected to the compression chamber 711, a first gear 714 rotatably connected to the end of the compression block 713, a second rack 715 slidably connected to the inner wall of the first zone 71, and a first rack 716 fixedly connected to the inner wall of the first zone 71. The first gear 714 is meshed with the second rack 715 and the first rack 716, and the second rack 715 and the first rack 716 are respectively arranged on both sides of the first gear 714. The inner wall of the first zone 71 is provided with The second slide groove 717, the second gear 743 is slidably connected in the second slide groove 717; the compression block 713 passes through the compression chamber 711 and extends into the first area 71, and a second spring 712 is provided between the compression block 713 and the inside of the compression chamber 711, and the second spring 712 forces the compression block 713 to move away from the first area 71; the second steel rope 67 is fixedly connected to the compression block 713, and the tension applied by the second steel rope 67 to the compression block 713 moves toward the first area 71, converting the angle selected by the backrest 1 into the moving distance of the compression block 713; refer to Figure 6, a through slot 751 is provided on the mounting plate 75, a transmission column 744 penetrating the through slot 751 is fixedly connected to the end of the second rack 715, and the second stroke amplification module 74 includes a second gear 743 rotatably connected to the transmission column 744 and located in the second area 72, a fourth rack 742 slidably connected to the inner wall of the second area 72, and a third rack 741 fixedly connected to the mounting plate 75 and located in the second area 72, the second gear 743 is respectively meshed with the third rack 741 and the fourth rack 742, a third slide groove 745 is provided on the inner wall of the second area 72, and the fourth rack 742 is arranged in the third slide groove 745; During the rotation of the connecting rod 2, the connecting rod 2 pulls the second steel rope 67 to drive the compression block 713 to move. Assuming that the speed of the compression block 713 is v, since the first rack 716 is fixed and meshes with the first gear 714, the first gear 714 generates a rotation speed n1, and the second rack 715 is consistent with the moving direction of the compression block 713, then the linear speed of the second rack 715 and the first gear 714 is v1+2Π*r*n1, wherein r is the radius of the first gear 714, so that the second rack 715 moves at a speed of v1+2Π*r*n1, so that the moving distance of the compression block 713 is amplified. Similarly, the stroke of the second rack 715 is amplified by the second gear 743, the third rack 741 and the fourth rack 742. By amplifying the secondary stroke, the rotation amplitude of the backrest 1 is amplified to the moving distance of the fourth rack 742.

[0036] refer to Fig. 9 The transmission mechanism 76 includes a plurality of directional wheels 761 arranged in the second cavity. The directional wheels 761 are connected to the driving wheel 78 through a chain 762. The two ends of the chain 762 are respectively fixedly connected to the two ends of the fourth rack 742. In this way, when the fourth rack 742 moves, the driving wheel 78 can be driven to rotate through the chain 762, so that the third gear 77 rotates on the tooth groove 52, so that the supporting leg 4 moves on the base 5.

[0037] refer to Figure 8 A supporting portion 41 and a sleeve portion 42 are provided at the bottom end of the supporting leg 4. The supporting portion 41 abuts against the base 5 to prevent the supporting leg 4 from applying pressure to the third sliding column 51, causing the third sliding column 51 to be bent. The sleeve portion 42 is sleeved on the third sliding column 51, and the outer side of the sleeve portion 42 abuts against the inner wall of the base 5, which can limit the movement of the supporting leg 4.

[0038] refer to Fig.10When sitting upright, the center of gravity of the user is mainly located at the buttocks, and the seat frame 3, the base 5 and the support legs 4 are connected and arranged with each other, and the side projection together forms the shape of the letter "C", so that the center of gravity of the user can be located within the projection area of ​​the base 5; Reference Fig.11 When lying on one's back, the user's center of gravity is mainly located at the waist. The harder the user lies back, the more the center of gravity moves toward the chest. By adjusting the connection and arrangement of the seat frame 3, the base 5 and the support legs 4, the side projections of the three form an inverted "Z", so that the center of gravity is always located in the base 5 during the backward adjustment process.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A seat, characterized in that: The invention comprises a backrest (1), a seat frame (3), a base (5), a connecting rod (2) connecting the backrest (1) and the seat frame (3), and a supporting leg (4) connecting the seat frame (3) and the base (5), wherein the connecting rod (2) is slidably connected to the backrest (1), the connecting rod (2) can rotate around one end of the seat frame (3), the supporting leg (4) can move on the base (5), the supporting leg (4) can rotate around the bottom end of the base (5), a moving mechanism (7) for driving the seat frame (3) to move along the base (5) is provided in the supporting leg (4), and a linkage mechanism (6) for linking the backrest (1) and the moving mechanism (7) is provided in the seat frame (3); When sitting upright, the support leg (4) is located at one end of the base (5), and the side projections of the seat frame (3), the base (5) and the support leg (4) form a C shape; When lying on one's back, the support leg (4) is located at the other end of the base (5), and the side projections of the seat frame (3), the base (5) and the support leg (4) form an inverted Z shape.

2. A seat according to claim 1, characterized in that: The seat frame (3) is provided with a first cavity (61), the linkage mechanism (6) comprises a rotating shaft (62) rotatably connected to the seat frame (3) and arranged in the first cavity (61), a damping module (65) abutting against the rotating shaft (62), a limiting module (64) limiting the rotation of the rotating shaft (62), and a second steel rope (67) having one end fixedly connected to the connecting rod (2), the rotating shaft (62) being fixedly connected to the connecting rod (2), a torsion spring (63) being provided on the rotating shaft (62), one end of the torsion spring (63) being connected to the rotating shaft (62), and the other end being connected to the inner wall of the first cavity (61), the torsion spring (63) forcing the rotating shaft (62) to rotate axially, the second steel rope (67) passing through the seat frame (3) and the supporting leg (4), and the other end of the second steel rope (67) being connected to the moving mechanism (7).

3. A seat according to claim 2, characterized in that: The damping module (65) comprises a first sliding column (651) fixedly connected to the seat frame (3) and arranged in the first cavity (61), a clamping block (652) slidably connected to the first sliding column (651), a first steel rope (66) fixedly connected to the clamping block (652), and an adjustment component (68) arranged on the supporting leg (4), wherein the tension applied by the first steel rope (66) to the clamping block (652) is directed toward the rotating shaft (62), and the other end of the first steel rope (66) is connected to the adjustment component (68).

4. A seat according to claim 3, characterized in that: The adjustment assembly (68) comprises a force-bearing rod (681) rotatably connected to the end of the supporting leg (4), the force-bearing rod (681) being fixedly connected to the seat frame (3), one end of the force-bearing rod (681) away from the supporting leg (4) being movably connected to a force transmission rod (682), a slider (685) being slidably connected to the supporting leg (4), the slider (685) being rotatably connected to one end of the force transmission rod (682), the slider (685) being connected to the pressing block (652) via a first steel rope (66), the first steel rope (66) passing through the seat frame (3), a second sliding column (683) being provided on the side of the supporting leg (4), the second sliding column (683) being slidably connected to the slider (685), a first spring (684) being sleeved on the second sliding column (683), the first spring (684) being arranged between the slider (685) and a fixed block at one end of the second sliding column (683).

5. A seat according to claim 4, characterized in that: The limiting module (64) comprises a button block (642) whose end is inserted through the side of the seat frame (3), a fourth gear (644) fixedly connected to the rotating shaft (62), and a limiting tooth (645) fixedly connected to the button block (642); the inner wall of the first cavity (61) is provided with a first slide groove (641) penetrating the side of the seat frame (3); the button block (642) penetrating the side of the seat frame (3) is slidably connected in the first slide groove (641); a return spring (643) is provided between the button block (642) and the inner wall of the first slide groove (641); the return spring (643) forces the button block (642) to move outward; When the button block (642) is in a non-pressed state, the limiting tooth (645) meshes with the fourth gear (644); When the button block (642) is in a pressed state, the limiting tooth (645) is disengaged from the fourth gear (644); When the button block (642) rebounds, the button block (642) is acted upon by the return spring (643) so that the limiting tooth (645) re-engages with the fourth gear (644).

6. A seat according to claim 5, characterized in that: The support leg (4) is provided with a second cavity. The moving mechanism (7) comprises a mounting plate (75) fixedly connected to the second cavity. The mounting plate (75) divides the second cavity into a first area (71) and a second area (72). The first area (71) is connected to a compression cavity (711). A compression block (713) is slidably connected inside the compression cavity (711). The compression block (713) passes through the compression cavity (711). A second spring (712) is provided between the compression block (713) and the inside of the compression cavity (711). The second spring (712) forces the compression block (713) to move toward the base (5). The end of the compression block (713) is rotatably connected to a first gear (714). The connecting rod (2) is connected to one end of the compression block (713) via a second steel rope (67).

7. A seat according to claim 6, characterized in that: A first rack (716) is fixedly mounted on one side of the first gear (714), and the other side is slidably connected to a second rack (715) of the first area (71), and the first gear (714) is meshed with the first rack (716) and the second rack (715); A through slot (751) is provided on the mounting plate (75); a transmission column (744) penetrating the through slot (751) is fixedly connected to the end of the second rack (715); the transmission column (744) is disposed in the through slot (751); The transmission column (744) is rotatably connected to the second gear (743); one side of the second gear (743) is fixedly connected to the third rack (741); the other side is slidably connected to the fourth rack (742) of the second area (72); the second gear (743) is meshed with the third rack (741) and the fourth rack (742) respectively.

8. A seat according to claim 7, characterized in that: The end of the support leg (4) is rotatably connected to a third gear (77), the base (5) is fixedly connected to a third sliding column (51), one end of the support leg (4) is sleeved on the third sliding column (51), the third sliding column (51) is provided with a plurality of tooth grooves (52), and the third gear (77) is meshed with the tooth grooves (52).

9. A seat according to claim 8, characterized in that: The second chamber is provided with a transmission mechanism (76) for driving the third gear (77) to rotate, and the transmission mechanism (76) is connected to the fourth rack (742).

10. A desk and chair, characterized in that: Including seats.

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