The main structure of a chair that can be used in both sitting and lying positions

Abstract

The main structure of a chair that can be used for sitting and lying of the present invention is composed of a backrest component, a seat component, and a locking component. By connecting the left and right dorsal side members of the backrest component and the left and right main rear support members of the seat component, a parallelogram main mechanism is formed. The fixed component of the locking component (chair reclining support component or chair angle adjustment component) is fixedly connected to the seat frame component, and the movable component is fixedly connected to the backrest frame component. When the operating member rotationally connected to the fixed component is operated, and the backrest is gradually rotated backward by human force, when bearing a gradually increasing human torque, a chain reaction occurs: the force of the locking component to maintain the sitting state gradually increases; the seat member moves downward and backward; the left and right auxiliary support members extend backward. A smooth and reliable switching from sitting to lying is achieved. By operating the operating member in the reverse direction, a smooth and reliable switching from lying to sitting is achieved. The present invention matches the parallelogram mechanism with the improved locking device, ensuring that the product has a sufficient and reassuring service life and performance, and enhancing the market prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture, and more particularly to a main structure of a chair that can be used for sitting and lying. Background Art

[0002] There is a social consensus on the issue that "taking a nap has various benefits". Two technical solutions, namely "the main structure of a reclining chair and a reclining sofa with a movable locking device" with the patent number ZL201920360712.2 and "a reclining switching mechanism of a reclining seat" with the patent number ZL201921115887.3, both attempt to popularly solve the problem of taking a nap for groups such as office workers and students, creating conditions for good napping habits and benefiting the general public. These two technical solutions both make full use of the motion characteristics of the parallelogram main mechanism, and adopt auxiliary support members and locking devices to achieve mutual switching between sitting and lying. Both of these solutions only require one operation to achieve the linkage of the backrest, seat, auxiliary support member and armrest, complete the switching from the sitting position to the lying position or from the lying position to the sitting position, with convenient operation, simple structure, easy to popularize, and having the advantages of being suitable for narrow occasions or reducing the occupied area. In the above two technical solutions, the locking device is the most critical sitting-lying switching device besides the main mechanism. If there is a problem with the locking device, it will completely affect the use function of the product. These two technical solutions using a controllable gas spring as the locking device have the following deficiencies: ① Due to reasons in principle, there is a high-pressure medium in the cylinder of the controllable gas spring, and its necessary sealing structure will affect its service life, increase the maintenance cost and difficulty, and there are usage risks. In general occasions, such as places not far from maintenance or places where use is relatively concentrated and safe, there is no big problem; for products exported or in places far from the maintenance site, using a controllable gas spring as the locking device may lead to a series of problems; ② During the process of switching from the sitting position to the lying position, when operating the controllable gas spring, there is still a constant force after it loses its locking force. This constant force does not change with the compression amount. When a person leans back against the backrest and the backrest rotates backward, the center of gravity of the human body moves backward as the backrest rotates backward, gradually increasing the torque on the backrest; the controllable gas spring with a constant force resists the gradually increasing torque. Because the parallelogram gradually changes from a rectangle to a rhombus with the distance between the upper and lower parallel sides gradually decreasing, the elevation angle of its constant force also gradually decreases, making the ability of the constant force to resist the gradually increasing torque also decrease. This change of one large and one small makes the backrest and the whole chair show an adverse phenomenon of accelerating sinking when the backrest reaches a certain backward tilt angle. In order to overcome this adverse phenomenon and achieve a smooth switch, it is necessary to add another gradually increasing force object to make up for the deficiency of the controllable gas spring; ③ When in the lying position, the parallelogram mechanism forms a rhombus shape, and the elevation angle of the controllable gas spring is the smallest. At the initial position when switching from the lying position to the sitting position, due to the insufficient thrust of the constant force, there will be an adverse phenomenon of difficult reset. At this time, a certain force-increasing object is also needed to assist the controllable gas spring to successfully complete the switch from the lying position to the sitting position. Therefore, in the sitting-lying dual-purpose chair products that make full use of the motion characteristics of the parallelogram mechanism, to better ensure its performance and improve the market prospect, it is necessary to select a more reliable, more mature and safer locking device to match the main mechanism, which is the key to ensuring the quality and quantity of the product. Summary of the Invention

[0003] The main objective of the present invention is to provide a main structure of a chair that can be used for both sitting and lying. This technical solution is an improvement and enhancement of two technical solutions, namely, the "main structure of a sitting and lying chair and a sitting and lying sofa with a mobile locking device" with the patent number ZL201920360712.2 and the "sitting and lying switching mechanism of a sitting and lying seat" with the patent number ZL201921115887.3. It is a better match between the characteristics of a parallelogram main mechanism and a reliable, mature, and safe locking device. On the basis of maintaining the advantages of the above two solutions - convenient operation, simple structure, easy to popularize, and suitable for narrow spaces or reducing the occupied area, a more matching locking device is selected, which is an improvement of the locking device. The improved locking device: ① ensures that the product has a sufficient and reassuring service life; ② ensures that the product has sufficient and reassuring performance, making the sitting and lying mutual switching smoother and more reliable - during the process of switching from the sitting position to the lying position, after eliminating the locking force, the resistance to the moment of the human body force on the backrest gradually increasing also increases; during the process of resetting from the lying position to the sitting position, after eliminating the locking force, the reset force decreases from large to small, making the reset smooth and stable. Thus, the application range of the product is expanded, and its domestic and foreign sales volume is increased.

[0004] To achieve the above main object, the present invention is realized by the following technical solutions. It mainly consists of a backrest component, a seat component, and a locking component. The backrest component mainly consists of a backside member, a back cross member, and a backrest member. The backside member includes a left backside member and a right backside member. One end of the back cross member is fixedly connected to the left backside member, and the other end of the back cross member is fixedly connected to the right backside member. The object formed by the back cross member, the left backside member, and the right backside member is the backrest frame assembly, and the backrest member is fixedly connected to the backrest frame assembly. The seat component mainly consists of a front main support assembly, a rear main support assembly, side members, a seat member, a seat cross member, and a secondary support member assembly. The front main support assembly mainly consists of a left front main support member, a right front main support member, and a front cross member. One end of the front cross member is fixedly connected to the left front main support member, and the other end of the front cross member is fixedly connected to the right front main support member. The rear main support assembly mainly consists of a left rear main support member, a right rear main support member, and a rear cross member. One end of the rear cross member is fixedly connected to the left rear main support member, and the other end of the rear cross member is fixedly connected to the right rear main support member. The side members include an upper side member and a lower side member. The upper side member includes a left upper side member and a right upper side member. The lower side member includes a left lower side member and a right lower side member. One end of the seat cross member is fixedly connected to the left upper side member, and the other end of the seat cross member is fixedly connected to the right upper side member. The object formed by the seat cross member, the left upper side member, and the right upper side member is the seat frame assembly, and the seat member is fixedly connected to the seat frame assembly. The rear end of the left upper side member is rotatably connected to the upper end of the left rear main support member, and the front end of the left upper side member is rotatably connected to the upper end of the left front main support member. The rear end of the right upper side member is rotatably connected to the right rear main support member, and the front end of the right upper side member is rotatably connected to the upper end of the right front main support member. The rear end of the left lower side member is rotatably connected to a suitable position of the left rear main support member, and the front end of the left lower side member is rotatably connected to a suitable position of the left front main support member. The rear end of the right lower side member is rotatably connected to a suitable position of the right rear main support member, and the front end of the right lower side member is rotatably connected to a suitable position of the right front main support member. A parallelogram frame is formed by the front main support assembly, the rear main support assembly, the seat frame assembly, the left lower side member, and the right lower side member. The lower end of the left backside member of the backrest component is fixedly connected to the upper end of the left rear main support member, and the lower end of the right backside member of the backrest component is fixedly connected to the upper end of the right rear main support member of the seat component.The described secondary support component assembly mainly consists of a secondary support, a secondary cross member, and a tension and compression member. The secondary support includes a left secondary support and a right secondary support. The upper part of the secondary support is a horizontal portion, and the lower part of the secondary support is an inclined portion. One end of the secondary cross member is fixedly connected to the left secondary support, and the other end of the secondary cross member is fixedly connected to the right secondary support. A suitable position of the inclined portion of the left secondary support is rotatably connected to a suitable position of the left rear main support. A long slot is provided in the horizontal portion of the left secondary support. A suitable position of the inclined portion of the right secondary support is rotatably connected to a suitable position of the right rear main support. A long slot is provided in the horizontal portion of the right secondary support. The tension and compression member includes a left tension and compression member and a right tension and compression member. The left tension and compression member is fixedly connected to the upper left side member, and the left tension and compression member is movably connected to the long slot of the left secondary support. The right tension and compression member is fixedly connected to the upper right side member, and the right tension and compression member is movably connected to the long slot of the right secondary support. The locking component mainly consists of a fixed component, a movable component, and an operating member. The fixed component and the movable component are rotatably connected, and the operating member is rotatably connected to a suitable position of the fixed component. The fixed component of the locking component is fixedly connected to a suitable position of the parallelogram frame. The movable component of the locking component is fixedly connected to a suitable position of the chair back component.

[0005] The described locking component is a chair reclining support component. The fixed component is a reclining support fixed component, the movable component is a reclining support movable component, and the operating member is a reclining support operating member. The reclining support fixed component and the reclining support movable component are rotatably connected. The reclining support operating member is rotatably connected to a suitable position of the reclining support fixed component. The reclining support fixed component is fixedly connected to the seat frame component of the seat component of the chair. The reclining support movable component is fixedly connected to the chair back frame component of the chair back component.

[0006] The described locking component is a chair angle adjustment component. The chair angle adjustment component consists of a main angle adjustment component and a secondary angle adjustment component. The main angle adjustment component mainly consists of a main angle adjustment fixed sub-component, a main angle adjustment movable sub-component, and a main angle adjustment operating member. The main angle adjustment fixed sub-component and the main angle adjustment movable sub-component are rotatably connected. The main angle adjustment operating member is rotatably connected to a suitable position of the main angle adjustment fixed sub-component. The main angle adjustment fixed sub-component is fixedly connected to the upper side member, and the main angle adjustment movable sub-component is fixedly connected to the back side member. The secondary angle adjustment component mainly consists of a secondary angle adjustment fixed sub-component and a secondary angle adjustment movable sub-component. The secondary angle adjustment fixed sub-component and the secondary angle adjustment movable sub-component are rotatably connected. The secondary angle adjustment fixed sub-component is fixedly connected to another upper side member, and the secondary angle adjustment movable sub-component is fixedly connected to another back side member.

[0007] A limiting member is provided on the parallelogram frame.

[0008] The position of the limiting member is adjustable.

[0009] Pulleys are provided at the lower part of the parallelogram frame.

[0010] Pulleys are provided at the lower part of the auxiliary support member assembly.

[0011] An armrest assembly is provided on the seat frame assembly.

[0012] An armrest assembly is provided between the backrest frame assembly and the seat frame assembly.

[0013] Through the above structure, the specific operations and movements of the main structure of a chair that can be used for sitting and lying are described by taking the locking member as the chair reclining support member as an example.

[0014] 1. Specific operations and movements of the chair when switching from the sitting position to the lying position.

[0015] When the chair is in the sitting position, the chair reclining support member is in the locked state. There are two operations for the chair to switch from the sitting position to the lying position: 1) Press the reclining support operating member, and the chair reclining support member loses the locking force, but there is still a force to maintain the sitting state. Lean the back against the backrest member, and the backrest member gradually tilts backward. As the backward tilt angle of the backrest member increases, the following chain reactions occur: ① Due to the movement characteristics of the parallelogram main mechanism, the seat member translates backward and downward, and the left auxiliary support member and the right auxiliary support member of the auxiliary support member extend backward; ② The moment acting on the backrest member by the human body gradually increases; the force to maintain the sitting state that resists this moment also gradually increases. The gradually increasing force to maintain the sitting state ensures the smooth backward tilt of the backrest member and the smooth translation of the seat member backward and downward; the extended left and right auxiliary support members ensure the stability of the chair and prevent it from tipping backward. When the lying position is positioned at the lowest position, pull up the reclining support operating member, and the chair reclining support member restores the locking force, and the chair is locked in the lowest lying position, realizing a smooth and reliable switch from the sitting position to the lying position; 2) Before pressing the reclining support operating member to a certain node, the chair reclining support member loses the locking force, and keep pressing the reclining support operating member and maintain it before this node. Lean the back against the backrest member, and the backrest member gradually tilts backward. As the backward tilt angle of the backrest member increases, the chain reactions generated are the same as those of the first operation method. When the desired lying position angle is obtained, release the reclining support operating member, and the reclining support operating member automatically resets, and the chair reclining support member automatically returns to the locked state. The second operation method is more convenient and is easy to achieve stepless adjustment of the chair within a certain range.

[0016] 2. Specific operations and movements of the chair when switching from the lying position to the sitting position.

[0017] When a person leaves the chair and presses the reclining support operating member, or presses the reclining support operating member before reaching a certain node, the locking force of the chair reclining support component is lost, and it is in the maximum or relatively large force to maintain the sitting state, causing the backrest component to rotate forward, and the following chain reactions occur: ① Due to the motion characteristics of the parallelogram main mechanism, the seat member moves forward and upward, and the left and right sub-support members of the sub-support member contract forward; ② The force of the chair reclining support component to maintain the sitting state gradually decreases, and the backrest component and the seat component are smoothly positioned in the sitting position by the chair reclining support component. Operating the reclining support operating member, the chair reclining support component restores the locking force and locks the chair in the sitting position, completing a smooth switch from the lying position to the sitting position.

[0018] In summary, this technical solution is an improvement and enhancement of the two technical solutions of "the main structure of a sitting and reclining chair and a sitting and reclining sofa with a movable locking device" with the patent number ZL201920360712.2 and "the sitting and reclining switching mechanism of a sitting and reclining furniture" with the patent number ZL201921115887.3. It is a better match between the characteristics of the parallelogram mechanism main body and a mature locking device. While maintaining the advantages of these two solutions - convenient operation, simple structure, easy to popularize, and suitable for narrow spaces or reducing the occupied area, a more matching locking device is selected, which is an improvement of its locking device. The improved locking device: ① ensures that the product has a sufficient and reliable service life; ② ensures that the product has sufficient and reliable performance, making the sitting and reclining mutual switching smoother and more reliable - during the process of switching from the sitting position to the lying position, after eliminating the locking force, the resistance to the moment of the human body force gradually increasing on the backrest also increases; during the process of resetting from the lying position to the sitting position, after eliminating the locking force, the reset force decreases from large to small, making the reset smooth and stable. Thus, the application range of the product is expanded, and its domestic and foreign sales volume is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following will illustrate the best implementation of the present invention with reference to the accompanying drawings.

[0020] Figure 1 It is a left view schematic diagram of the main structure of a sitting and reclining chair;

[0021] Figure 2 is Figure 1 A top view schematic diagram in the direction of A of DETAILED DESCRIPTION OF THE INVENTION

[0022] The following will make a detailed description of the embodiments of the present invention with reference to the accompanying drawings.

[0023] See Figure 1 and Figure 2 . This embodiment mainly consists of a backrest component 1, a seat component 2, and a locking component 3. The backrest component 1 mainly consists of a back side member 1-1, a back cross member 2-1 ( Figure 1 shown by the dashed line) and a backrest member 3-1 (Figure 2 It is composed of a dorsal member 1-1 (shown by a double-dashed line). The dorsal member 1-1 includes a left dorsal member 1-1-1 and a right dorsal member 2-1-1. One end of the dorsal cross member 2-1 is fixedly connected to the left dorsal member 1-1-1, and the other end of the dorsal cross member 2-1 is fixedly connected to the right dorsal member 2-1-1. The object composed of the dorsal cross member 2-1, the left dorsal member 1-1-1, and the right dorsal member 2-1-1 is the backrest frame assembly B-K, and the backrest member 3-1 is fixedly connected to the backrest frame assembly B-K. The seat member 2 mainly consists of a front main support assembly 1-2, a rear main support assembly 2-2, side members 3-2, a seat member 4-2 ( Figure 2 shown by a double-dashed line), a seat cross member 5-2 ( Figure 1 shown by a dashed line), and an auxiliary support member assembly 6-2. The front main support assembly 1-2 mainly consists of a left front main support member 1-1-2, a right front main support member 2-1-2, and a front cross member 3-1-2. One end of the front cross member 3-1-2 is fixedly connected to the left front main support member 1-1-2, and the front cross member 3-1-2 ( Figure 1 shown by a dashed line) at the other end is fixedly connected to the right front main support member 2-1-2. The rear main support assembly 2-2 mainly consists of a left rear main support member 1-2-2, a right rear main support member 2-2-2, and a rear cross member 3-2-2 ( Figure 1It consists of (as shown by the dashed line). One end of the rear cross member 3-2-2 is fixedly connected to the left main rear support member 1-2-2, and the other end of the rear cross member 3-2-2 is fixedly connected to the right main rear support member 2-2-2. The side member 3-2 includes an upper side member 1-3-2 and a lower side member 2-3-2. The upper side member 1-3-2 includes a left upper side member 1-1-3-2 and a right upper side member 2-1-3-2. The lower side member 2-3-2 includes a left lower side member 1-2-3-2 and a right lower side member 2-2-3-2. One end of the seat cross member 5-2 is fixedly connected to the left upper side member 1-1-3-2, and the other end of the seat cross member 5-2 is fixedly connected to the right upper side member 2-1-3-2. The object composed of the seat cross member 5-2, the left upper side member 1-1-3-2, and the right upper side member 2-1-3-2 is the seat frame assembly Z-K. The seat member 4-2 is fixedly connected to the seat frame assembly Z-K. The rear end of the left upper side member 1-1-3-2 is rotatably connected to the upper end of the left main rear support member 1-2-2, and the front end of the left upper side member 1-1-3-2 is rotatably connected to the upper end of the left front main support member 1-1-2. The rear end of the right upper side member 2-1-3-2 is rotatably connected to the right main rear support member 2-2-2, and the front end of the right upper side member 2-1-3-2 is rotatably connected to the upper end of the right front main support member 2-1-2. The rear end of the left lower side member 1-2-3-2 is rotatably connected to the left main rear support member 1-2-2, and the front end of the left lower side member 1-2-3-2 is rotatably connected to the left front main support member 1-1-2. The rear end of the right lower side member 2-2-3-2 is rotatably connected to the right main rear support member 2-2-2, and the front end of the right lower side member 2-2-3-2 is rotatably connected to the right front main support member 2-1-2. The front main support assembly 1-2, the rear main support assembly 2-2, the seat frame assembly Z-K, the left lower side member 1-2-3-2, and the right lower side member 2-2-3-2 form a parallelogram frame J-K. The lower end of the left back side member 1-1-1 of the chair back part 1 is fixedly connected to the upper end of the left main rear support member 1-2-2, and the lower end of the right back side member 2-1-1 of the chair back part 1 is fixedly connected to the upper end of the right main rear support member 2-2-2 of the seat part 2. The auxiliary support member assembly 6-2 mainly consists of an auxiliary support member 1-6-2, an auxiliary cross member 2-6-2, and a compression and tension member 3-6-2. The auxiliary support member 1-6-2 includes a left auxiliary support member 1-1-6-2 and a right auxiliary support member 2-1-6-2. The upper part of the auxiliary support member 1-6-2 is a horizontal part SB( Figure 1 (as shown by the dashed line). The lower part of the auxiliary support member 1-6-2 is an inclined part XB. One end of the auxiliary cross member 2-6-2 is fixedly connected to the left auxiliary support member 1-1-6-2, and the other end of the auxiliary cross member 2-6-2 is fixedly connected to the right auxiliary support member 2-1-6-2. The inclined part XB of the left auxiliary support member 1-1-6-2 is rotatably connected to the left main rear support member 1-2-2. The horizontal part SB of the left auxiliary support member 1-1-6-2 is provided with a long groove C( Figure 1 (as shown by the dashed line). The inclined part XB of the right auxiliary support member 2-1-6-2 is rotatably connected to the right main rear support member 2-2-2. The compression and tension member 3-6-2 is a left compression and tension member 1-3-6-2(Figure 2 shown by the dashed line) and the right tension and compression member 2-3-6-2 ( Figure 2 shown by the dashed line). A long slot C is provided in the horizontal part SB of the right auxiliary support member 2-1-6-2 ( Figure 1 shown by the dashed line). The left tension and compression member 1-3-6-2 is fixedly connected to the upper left side member 1-1-3-2. The long slot C of the left tension and compression member 1-3-6-2 is movably connected to the long slot C of the left auxiliary support member 1-1-6-2. The right tension and compression member 2-3-6-2 is fixedly connected to the upper right side member 2-1-3-2. The long slot C of the right tension and compression member 2-3-6-2 is movably connected to the long slot C of the right auxiliary support member 2-1-6-2. The locking member 3 mainly consists of a fixed component 1-3, a movable component 2-3, and an operating member 3-3. The fixed component 1-3 and the movable component 2-3 are rotatably connected. The operating member 3-3 is rotatably connected to the fixed component 1-3. In this example, the locking member 3 is the chair reclining support member T-3, the fixed component 1-3 is the reclining support fixed component T-1-3, the movable component 2-3 is the reclining support movable component T-2-3, and the operating member 3-3 is the reclining support operating member T-3-3. The reclining support fixed component T-1-3 and the reclining support movable component T-2-3 are rotatably connected. The reclining support operating member T-3-3 is rotatably connected to the reclining support fixed component T-1-3. The reclining support fixed component T-1-3 is fixedly connected to the seat cross member 5-2 of the seat frame assembly Z-K. The reclining support movable component T-2-3 is fixedly connected to the back cross member 2-1 of the backrest frame assembly B-K. A limiting member X is provided on the front main support assembly 1-2 ( Figure 1 shown by the dashed line). Universal wheels H1 are provided at the lower ends of the left front main support member 1-1-2, the right front main support member 2-1-2, the left rear main support member 1-2-2, and the right rear main support member 2-2-2. Universal wheels H2 are provided at the lower ends of the left auxiliary support member 1-1-6-2 and the right auxiliary support member 2-1-6-2 of the auxiliary support member assembly 6-2. One end of a pair of armrest assemblies F is rotatably connected to the back side member 1-1 respectively, and the other end of the armrest assemblies F is rotatably connected to the upper side member 1-3-2 respectively. Figure 1 The figure shown by the double-dot dash line in the lower left is the figure in the reclining position.

[0024] Through the above structure, the specific operations and actions of an example of the main structure of a chair that can be used as both a seat and a recliner are as follows.

[0025] 1. The specific operations and actions of the chair switching from the sitting position to the reclining position.

[0026] When the chair is in the sitting position, the reclining support component T-3 is in the locked state. There are two operations for the chair to switch from the sitting position to the reclining position: 1) Press the reclining support operating part T-3-3, and the reclining support component T-3 loses the locking force, but there is still a force to maintain the sitting state. Lean the back against the backrest component 1, and the backrest component 1 gradually tilts backward. As the backward tilt angle of the backrest component 1 increases, the following chain reactions occur: ① Due to the motion characteristics of the parallelogram main mechanism, the seat component 4-2 translates backward and downward, and the left sub-support 1-1-6-2 and the right sub-support 2-1-6-2 of the sub-support component 6-2 extend backward; ② The moment exerted by the human body on the backrest component 1 gradually increases; the force to maintain the sitting state that resists this moment also gradually increases. The gradually increasing force to maintain the sitting state ensures the smooth backward tilt of the backrest component 1 and the smooth backward and downward translation of the seat component 2; the extended left sub-support 1-1-6-2 and right sub-support 2-1-6-2 of the sub-support component 6-2 ensure the stability of the chair and prevent it from tipping backward. When the reclining position is positioned at the lowest position, pull up the reclining support operating part T-3-3, and the reclining support component T-3 restores the locking force, and the chair is locked in the lowest reclining position, realizing a smooth and reliable switch from the sitting position to the reclining position; 2) Before pressing the reclining support operating part T-3-3 to a certain node, the reclining support component T-3 loses the locking force, and keep pressing the reclining support operating part T-3-3 and maintain it before this node. Lean the back against the backrest component 1, and the backrest component 1 gradually tilts backward. As the backward tilt angle of the backrest component 1 increases, the chain reactions generated are the same as those of the first operation method. When the desired reclining position angle is obtained, release the reclining support operating part T-3-3, and the reclining support operating part T-3-3 automatically resets, and the reclining support component T-3 automatically returns to the locked state. The second operation method is more convenient and easy to achieve stepless adjustment of the chair within a certain range.

[0027] 2. Specific operations and actions for the chair to switch from the reclining position to the sitting position.

[0028] When a person leaves the chair, press the reclining support operating part T-3-3, or press the reclining support operating part T-3-3 to a certain node before, the reclining support component T-3 loses the locking force and is in the maximum or relatively large force to maintain the sitting state, causing the backrest component 1 to rotate forward, and the following chain reactions are brought about: ① Due to the motion characteristics of the parallelogram main mechanism, the seat component 4-2 translates forward and upward, and the left sub-support 1-1-6-2 and the right sub-support 2-1-6-2 of the sub-support component 6-2 contract forward; ② The force of the reclining support component T-3 to maintain the sitting state gradually decreases, and the backrest component 1 and the seat component 2 are smoothly positioned in the sitting position by the reclining support component T-3. Operate the reclining support operating part T-3-3, and the reclining support component T-3 restores the locking force, locking the chair in the sitting position and completing a smooth switch from the reclining position to the sitting position.

[0029] In summary, this technical solution is an improvement and enhancement of the two technical solutions of "The main structure of a reclining chair and a reclining sofa with a movable locking device" with the patent number ZL201920360712.2 and "The reclining switching mechanism of a reclining seat" with the patent number ZL201921115887.3. It is a better match between the characteristics of the parallelogram mechanism main body and a mature locking device. While maintaining the advantages of these two solutions - convenient operation, simple structure, easy to popularize, and suitable for narrow spaces or reducing the occupied area, a more suitable locking device is selected, which is an improvement to its locking device. The improved locking device: ① ensures that the product has a sufficient and reliable service life; ② ensures that the product has sufficient and reliable performance, making the reclining and sitting switching smoother and more reliable - during the process of switching from the sitting position to the lying position, after eliminating the locking force, the resistance to the moment of the human body force on the backrest gradually increasing also increases; during the process of resetting from the lying position to the sitting position, after eliminating the locking force, the reset force decreases from large to small, making the reset smooth and stable. Thus, the application range of the product is expanded, and its domestic and foreign sales volume is increased.

Claims

1. The main structure of a chair that can be used in both sitting and lying positions, which mainly consists of three parts: a backrest component, a seat component, and a locking component. The backrest component (1) mainly consists of a backside member (1-1), a back cross member (2-1), and a backrest member (3-1). The backside member (1-1) includes a left backside member (1-1-1) and a right backside member (2-1-1). One end of the back cross member (2-1) is fixedly connected to the left backside member (1-1-1), and the other end of the back cross member (2-1) is fixedly connected to the right backside member (2-1-1). The object formed by the back cross member (2-1), the left backside member (1-1-1), and the right backside member (2-1-1) is the backrest frame assembly (B-K). The backrest member (3-1) is fixedly connected to the backrest frame assembly (B-K). The seat component (2) mainly consists of a front main support assembly (1-2), a rear main support assembly (2-2), side members (3-2), a seat member (4-2), a seat cross member (5-2), and a secondary support member assembly (6-2). The front main support assembly (1-2) mainly consists of a left front main support member (1-1-2), a right front main support member (2-1-2), and a front cross member (3-1-2). One end of the front cross member (3-1-2) is fixedly connected to the left front main support member (1-1-2), and the other end of the front cross member (3-1-2) is fixedly connected to the right front main support member (2-1-2). The rear main support assembly (2-2) mainly consists of a left rear main support member (1-2-2), a right rear main support member (2-2-2), and a rear cross member (3-2-2). One end of the rear cross member (3-2-2) is fixedly connected to the left rear main support member (1-2-2), and the other end of the rear cross member (3-2-2) is fixedly connected to the right rear main support member (2-2-2). The side members (3-2) include an upper side member (1-3-2) and a lower side member (2-3-2). The upper side member (1-3-2) includes a left upper side member (1-1-3-2) and a right upper side member (2-1-3-2). The lower side member (2-3-2) includes a left lower side member (1-2-3-2) and a right lower side member (2-2-3-2). One end of the seat cross member (5-2) is fixedly connected to the left upper side member (1-1-3-2), and the other end of the seat cross member (5-2) is fixedly connected to the right upper side member (2-1-3-2). The object formed by the seat cross member (5-2), the left upper side member (1-1-3-2), and the right upper side member (2-1-3-2) is the seat frame assembly (Z-K). The seat member (4-2) is fixedly connected to the seat frame assembly (Z-K). The rear end of the left upper side member (1-1-3-2) is rotatably connected to the upper end of the left rear main support member (1-2-2), and the front end of the left upper side member (1-1-3-2) is rotatably connected to the upper end of the left front main support member (1-1-2).The rear end of the upper right side member (2-1-3-2) is rotatably connected to the rear right main support member (2-2-2), the front end of the upper right side member (2-1-3-2) is rotatably connected to the upper end of the front right main support member (2-1-2), the rear end of the lower left side member (1-2-3-2) is rotatably connected to a suitable position of the rear left main support member (1-2-2), the front end of the lower left side member (1-2-3-2) is rotatably connected to a suitable position of the front left main support member (1-1-2), the rear end of the lower right side member (2-2-3-2) is rotatably connected to a suitable position of the rear right main support member (2-2-2), the front end of the lower right side member (2-2-3-2) is rotatably connected to a suitable position of the front right main support member (2-1-2). A parallelogram frame (J-K) is formed by the front main support assembly (1-2), the rear main support assembly (2-2), the seat frame assembly (Z-K), the lower left side member (1-2-3-2) and the lower right side member (2-2-3-2). A limiting member (X) is provided on the parallelogram frame (J-K), and the position of the limiting member (X) is adjustable. The lower end of the left back side member (1-1-1) of the backrest member (1) is fixedly connected to the upper end of the rear left main support member (1-2-2), the lower end of the right back side member (2-1-1) of the backrest member (1) is fixedly connected to the upper end of the rear right main support member (2-2-2) of the seat member (2). The auxiliary support member assembly (6-2) mainly consists of an auxiliary support member (1-6-2), an auxiliary cross member (2-6-2) and a compression and tension member (3-6-2). The auxiliary support member (1-6-2) includes a left auxiliary support member (1-1-6-2) and a right auxiliary support member (2-1-6-2). The upper part of the auxiliary support member (1-6-2) is a horizontal part (SB), and the lower part of the auxiliary support member (1-6-2) is an inclined part (XB). One end of the auxiliary cross member (2-6-2) is fixedly connected to the left auxiliary support member (1-1-6-2), and the other end of the auxiliary cross member (2-6-2) is fixedly connected to the right auxiliary support member (2-1-6-2). The inclined part (XB) of the left auxiliary support member (1-1-6-2) is rotatably connected to a suitable position of the rear left main support member (1-2-2). A long groove (C) is provided on the horizontal part (SB) of the left auxiliary support member (1-1-6-2). The inclined part (XB) of the right auxiliary support member (2-1-6-2) is rotatably connected to a suitable position of the rear right main support member (2-2-2). The compression and tension member (3-6-2) includes a left compression and tension member (1-3-6-2) and a right compression and tension member (2-3-6-2). A long groove (C) is provided on the horizontal part (SB) of the right auxiliary support member (2-1-6-2). The left compression and tension member (1-3-6-2) is fixedly connected to the upper left side member (1-1-3-2).The left pressing and pulling member (1-3-6-2) is movably connected to the long slot (C) of the left auxiliary support member (1-1-6-2). The right pressing and pulling member (2-3-6-2) is fixedly connected to the upper right side member (2-1-3-2). The right pressing and pulling member (2-3-6-2) is movably connected to the long slot (C) of the right auxiliary support member (2-1-6-2). The locking member (3) is a chair reclining support member (T-3). The chair reclining support member (T-3) includes a reclining support fixing assembly (T-1-3), a reclining support movable assembly (T-2-3), and a reclining support operating member (T-3-3). The reclining support fixing assembly (T-1-3) is rotatably connected to the reclining support movable assembly (T-2-3). The reclining support operating member (T-3-3) is rotatably connected to the reclining support fixing assembly (T-1-3). The reclining support fixing assembly (T-1-3) is fixedly connected to the seat cross member (5-2) of the seat frame assembly (Z-K). The reclining support movable assembly (T-2-3) is fixedly connected to the back cross member (2-1) of the backrest frame assembly (B-K). An armrest assembly (F) is provided between the backrest frame assembly (B-K) and the seat frame assembly (Z-K).

2. The main structure of a convertible chair according to claim 1, wherein, A pulley (H1) is provided at the lower part of the parallelogram frame (J-K) described above.

3. The main structure of a convertible chair according to claim 1, characterized in that, A pulley (H2) is provided at the lower part of the auxiliary support member assembly (6-2) described above.

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