Supporting leg linkage folding and unfolding mechanism of a folding deck chair

Abstract

The utility model belongs to deck chair technical field, especially relates to a support foot linkage of folding deck chair and support mechanism, including bed body and be used for supporting the support frame of bed body, the bed body includes the seat frame and backrest that can be relatively folded, and the support frame is arranged on the seat frame, and the support foot is rotationally arranged on the backrest, and the transmission connecting rod is between the support foot and the seat frame, and the transmission connecting rod is rotationally connected with the support foot and the seat frame respectively, the backrest is controlled and is unfolded with the seat frame, and the transmission connecting rod can drive the support foot and the backrest to unfold oppositely, thereby making the support foot can support the backrest, the backrest is controlled and is folded with the seat frame, and the transmission connecting rod can drive the support foot and the backrest to fold oppositely and draw together, the transmission connecting rod is telescopic link, or, a plurality of installation sites are set up on the transmission connecting rod and are connected with the support foot and the seat frame, the utility model's purpose lies in providing a support foot linkage of folding deck chair and support mechanism that is stable in structure and is convenient to store and transport.

Description

Technical Field

[0001] This utility model belongs to the field of recliner technology, and specifically relates to a support leg linkage retraction mechanism for a folding recliner. Background Technology

[0002] A folding recliner, also known as a folding chair, is a simple chair designed using joint principles. For convenience and space saving, it can be folded and stored in various ways. It is convenient, practical, and easy to store.

[0003] Some folding recliners on the market have a three-fold structure, consisting of a backrest, seat frame, and leg rest. To improve the stability of the recliner, some folding recliners have foldable support legs on the backrest. For example, Chinese Utility Model Patent CN202321436144.2 discloses a folding recliner with a gravity-driven automatic positioning support mechanism. This includes a folding recliner and a backrest frame. A support mechanism is fitted onto the backrest frame. The support mechanism includes support leg tubes. The upper part of the support leg tubes is freely movable to the backrest frame. The support leg tubes hang naturally on the back of the backrest frame under their own weight. When the backrest frame tilts backward, the support leg tubes automatically hang down until the bottom of the support leg tubes touches the bottom surface to complete the support.

[0004] Although the support legs in the above structure can automatically unfold or fold under the action of gravity, the support legs cannot tilt towards the back frame of the recliner. During the use of the folding recliner, the support legs are prone to accidentally rotating towards the back frame of the recliner, affecting the support of the support legs on the back frame of the recliner. When the folding recliner is folded for storage, the support legs are prone to swinging freely, affecting the storage and transportation of the folding recliner. Summary of the Invention

[0005] In order to overcome the defects in the prior art, the purpose of this utility model is to provide a support leg linkage retraction mechanism for a folding recliner that is structurally stable and convenient for storage and transportation.

[0006] The purpose of this utility model is achieved as follows:

[0007] A folding recliner support leg linkage mechanism includes a bed frame and a support frame for supporting the bed frame. The bed frame includes a seat frame and a backrest that can be folded relative to each other. The support frame is disposed on the seat frame, and a support leg is rotatably disposed on the backrest. When the folding recliner is unfolded, the support leg is disposed on the underside of the backrest and can support the backrest. A transmission link is connected between the support leg and the seat frame. The transmission link is rotatably connected to the support leg and the seat frame respectively. The seat frame, backrest, support leg and transmission link are connected to form a four-bar linkage mechanism.

[0008] The backrest and seat frame can be unfolded relative to each other by controlling the backrest and seat frame to unfold relative to each other, so that the support legs can support the backrest; the backrest and seat frame can be folded relative to each other by controlling the backrest and seat frame to fold together relative to each other by controlling the support legs and backrest to fold together relative to each other by controlling the backrest and seat frame to fold together.

[0009] The transmission link is a telescopic rod, and controlling the extension and retraction of the transmission link can adjust the distance between the support foot and the hinge position of the seat and the transmission link; or, the transmission link is provided with multiple mounting positions, and controlling the installation of the support foot and the seat at different mounting positions can adjust the distance between the support foot and the hinge position of the seat and the transmission link.

[0010] The present invention is further configured such that: the transmission linkage includes a first rod and a second rod that can be telescopically connected, the first rod and the second rod being rotatably connected to the support foot and the seat frame respectively, and the first rod is provided with a locking member for controlling the relative fixation of the first rod and the second rod; controlling the extension and retraction of the first rod and the second rod can adjust the overall length of the transmission linkage, thereby adjusting the relative angle between the support foot and the backrest when the folding recliner is unfolded.

[0011] The present invention is further configured such that: a strip groove is provided on the first rod and the second rod respectively, and a locking member is detachably provided on the first rod and the second rod respectively. The locking member passes through the strip groove and is connected to the first rod or the second rod, thereby pressing the first rod and the second rod against each other and fixing the first rod and the second rod relatively. Loosening the locking member allows the first rod and the second rod to slide relative to each other, and the locking member can slide along the strip groove.

[0012] The present invention is further configured such that: the first rod body includes a straight rod portion and a bent portion, the bent portion is inclined toward the straight rod portion, the straight rod portion is rotatably connected to the support foot, and the strip groove on the first rod body is provided on the bent portion and is inclined toward the straight rod portion.

[0013] The present invention is further configured such that: the second rod body is provided with a plurality of fixing holes at intervals along its extension direction, and the overall length of the transmission connecting rod is different when the locking member cooperates with different fixing holes.

[0014] The present invention is further configured such that: the support frame includes a front leg rod and a rear leg rod that are rotatably connected; the front leg rod is rotatably connected to the seat frame; a support link is provided between the rear leg rod and the seat frame; the support link is rotatably connected to the rear leg rod and the seat frame respectively; the front leg rod, the rear leg rod, the support link and the seat frame are connected to form a four-bar linkage; when the folding recliner is unfolded, the rear leg rod can abut against the support link and support the support link.

[0015] The present invention is further configured such that: an armrest is rotatably provided on the rear leg bar, the armrest is rotatably connected to the backrest, and when the folding recliner is unfolded, the rear leg bar abuts against the support link and is relatively fixed to the support link. The combination of the armrest, backrest, seat frame, rear leg bar and support link forms a four-bar linkage.

[0016] The present invention is further configured such that: a swing groove is provided on the supporting connecting rod, a retaining block is provided on one side of the swing groove, the rear leg rod is rotatably disposed in the swing groove, and the retaining block is disposed on the upper side of the rear leg rod; when the folding recliner is unfolded and folded, the retaining block can abut against the upper side of the rear leg rod.

[0017] The present invention is further configured such that: the bed body also includes a foot frame rotatably connected to the seat frame, the foot frame and the backrest are respectively arranged on both sides of the seat frame, and an auxiliary connecting rod is provided between the foot frame and the front leg rod, and the seat frame, foot frame, auxiliary connecting rod and front leg rod are connected to form a four-bar linkage.

[0018] The present invention is further configured such that: the auxiliary link includes a third link and a fourth link that are slidably connected, the third link and the fourth link are rotatably connected to the leg and the front leg respectively, and the third link is provided with a plurality of positioning grooves at intervals, and the fourth link is provided with a positioning part that is adapted to the positioning grooves, and the positioning part cooperates with different positioning grooves to keep the auxiliary link at different lengths.

[0019] The advantages of this utility model compared to the prior art are:

[0020] 1. In this utility model, the seat frame, backrest, support legs, and transmission linkage are connected to form a four-bar linkage. During the unfolding and folding of the folding recliner, the support legs move with the relative movement of the seat frame and backrest, facilitating the automatic unfolding and folding of the support legs. This allows for quick unfolding and storage of the folding recliner, making it convenient for users. Furthermore, this structure prevents the support legs from rotating freely during use or storage and transportation, promoting stable unfolding and folding of the support legs. This, in turn, ensures stable support of the backrest by the support legs and prevents free rotation of the support legs during movement and transportation, facilitating the storage and transportation of the folding recliner. The extendable rod or multiple mounting positions allow users to adjust the distance between the support legs and the hinged positions of the seat frame and transmission linkage as needed, thereby changing the relative angle between the support legs and backrest when the folding recliner is unfolded. This makes it easier for users to use the folding recliner on uneven ground.

[0021] 2. The locking component and the retractable first and second rods in this utility model allow the user to adjust the overall length of the transmission linkage, thereby adjusting the relative angle between the support legs and the backrest when the folding recliner is unfolded. This makes it easier for the user to use the folding recliner on uneven ground. The presence of slots and locking components on the first and second rods facilitates stable sliding of the first and second rods and improves the stability of their connection, preventing bending and damage. The bent portion and the slots inclined to the straight portion tilt the force direction and sliding direction of the first and second rods, promoting stable installation and preventing accidental sliding during use, thus enhancing user convenience.

[0022] 3. The fixed hole structure in this utility model is simple. The overall length of the transmission link can be adjusted by the locking component cooperating with different fixed holes. The structure is stable, convenient for production and installation, and easy for users to adjust. It can also prevent the overall length of the transmission link from changing unexpectedly during use.

[0023] 4. In this utility model, the front leg rod, rear leg rod, support link, and seat frame are connected to form a four-bar linkage. When the folding recliner is unfolded, the rear leg rod can abut against the support link and support it. This structure has a strong load-bearing capacity, which is conducive to the stable support of the support frame for the bed. Moreover, when the folding recliner is unfolded, the rear leg rod abuts against the support link to form an integral structure. The combination of the seat frame, front leg rod, rear leg rod, and support link forms a triangular structure, which is conducive to improving the stability of the connection between the support frame and the seat frame. Since the combination of the armrest, backrest, seat frame, rear leg rod, and support link forms a four-bar linkage, this structure enables the folding of the support frame and the folding of the bed to be linked, which facilitates the quick unfolding and folding of the folding recliner. The setting of the swing groove facilitates the stable connection between the support link and the rear leg rod. Furthermore, since the clamping block can abut against the upper side of the rear leg rod when the folding recliner is unfolded and folded, it is conducive to the stable unfolding and folding of the folding recliner.

[0024] 5. The auxiliary linkage in this utility model facilitates the stable unfolding of the leg frame. Since the seat frame, foot frame, auxiliary linkage, and front leg rod are connected to form a four-bar linkage, it is convenient for the automatic unfolding and folding of the leg frame, making it convenient for users. It can also prevent the leg frame from rotating freely during the use or storage and transportation of the folding recliner, making the storage and transportation of the folding recliner easier. The slidingly connected third and fourth rods allow users to adjust the relative angle between the leg frame and the seat frame during use, which helps to improve the comfort of the folding recliner. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2This is one of the usage diagrams of this utility model after the support cloth has been removed;

[0027] Figure 3 This is the second illustration of the utility model after the support cloth has been removed.

[0028] Figure 4 This is a diagram showing the folded state of this utility model after the support fabric has been removed;

[0029] Figure 5 This is an exploded view of the present invention after the support fabric has been removed;

[0030] Figure 6 This is a schematic diagram of the structure of the support frame in this utility model;

[0031] Figure 7 This is an exploded view of the transmission connecting rod in this utility model;

[0032] Figure 8 This is a schematic diagram of the supporting connecting rod in this utility model;

[0033] Figure 9 This is a schematic diagram of the auxiliary connecting rod in this utility model.

[0034] The labels in the diagram mean: 1-support frame; 11-front leg; 12-rear leg; 2-bed frame; 21-seat frame; 22-backrest; 23-legs; 211-first hinge; 212-second hinge; 213-connecting part;

[0035] 3-Support foot; 4-Transmission link; 41-First rod; 42-Second rod; 43-Locking element; 411-Straight rod section; 412-Bent section; 413-Strip groove; 5-Support link; 51-Swing groove; 52-Clamping block; 6-Handrail; 7-Auxiliary link; 71-Third rod; 72-Fourth rod; 73-Positioning part; 711-Slide groove; 712-Positioning groove; 8-Supporting cloth. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0037] See Figures 1 to 9 As shown, a folding recliner's support leg linkage mechanism includes a bed body 2 and a support frame 1 for supporting the bed body 2. The bed body 2 includes a seat frame 21 and a backrest 22 that can be folded relative to each other. The support frame 1 is disposed on the seat frame 21, and a support leg 3 is rotatably disposed on the backrest 22. When the folding recliner is unfolded, the support leg 3 is disposed on the underside of the backrest 22 and can support the backrest 22. A transmission link 4 is connected between the support leg 3 and the seat frame 21. The transmission link 4 is rotatably connected to the support leg 3 and the seat frame 21 respectively. The seat frame 21, the backrest 22, the support leg 3 and the transmission link 4 are connected to form a four-bar linkage mechanism.

[0038] The backrest 22 and the seat frame 21 are unfolded relative to each other, and the transmission link 4 can drive the support leg 3 to unfold relative to the backrest 22, so that the support leg 3 can support the backrest 22; the backrest 22 and the seat frame 21 are folded relative to each other, and the transmission link 4 can drive the support leg 3 to fold and close relative to the backrest 22.

[0039] In the above structure, the seat frame 21, backrest 22, support legs 3, and transmission linkage 4 are connected to form a four-bar linkage. During the unfolding and folding of the folding recliner, the support legs 3 move with the relative movement of the seat frame 21 and backrest 22, facilitating the automatic unfolding and folding of the support legs 3. This allows for quick unfolding and storage of the folding recliner, making it convenient for the user. Furthermore, this structure prevents the support legs 3 from rotating freely during use or storage and transportation, ensuring stable unfolding and folding. This, in turn, provides stable support for the backrest 22 and prevents free rotation of the support legs 3 during movement and transportation, facilitating the storage and transportation of the folding recliner.

[0040] The transmission link 4 is a telescopic rod. Controlling the extension and retraction of the transmission link 4 can adjust the distance between the support leg 3 and the seat frame 21 and the hinge position of the transmission link 4. Alternatively, the transmission link 4 can be provided with multiple mounting positions. Controlling the installation of the support leg 3 and the seat frame 21 at different mounting positions can adjust the distance between the support leg 3 and the seat frame 21 and the hinge position of the transmission link 4. The telescopic rod or multiple mounting positions allow the user to adjust the distance between the support leg 3 and the seat frame 21 and the hinge position of the transmission link 4 as needed, thereby changing the relative angle between the support leg 3 and the backrest 22 when the folding recliner is unfolded. This makes it easier for the user to use the folding recliner on uneven ground.

[0041] The distance between the support foot 3 and the hinge position of the seat 21 and the transmission link 4 mentioned in this utility model refers to the distance between the hinge position of the support foot 3 and the transmission link 4 and the hinge position of the seat 21 and the transmission link 4, which is the effective length of the transmission link 4.

[0042] When the transmission link 4 is provided with multiple mounting positions, the transmission link 4 preferably includes a first rod body 41 and a second rod body 42. The first rod body 41 and the second rod body 42 are rotatably connected to the support foot 3 and the seat 21, respectively. The first rod body 41 is provided with a locking member 43, and the second rod body 42 is provided with a number of fixing holes at intervals in the extending direction. The overall length of the transmission link 4 is different when the locking member 43 cooperates with different fixing holes. The result of fixing holes is simple. The overall length of the transmission link 4 can be adjusted by cooperating the locking member 43 with different fixing holes. The structure is stable, convenient for production and installation, and convenient for users to adjust. It can also prevent the overall length of the transmission link from changing unexpectedly during use.

[0043] The preferred embodiment of this utility model is that the transmission link 4 includes a telescopically configurable first link 41 and second link 42. The first link 41 and second link 42 are rotatably connected to the support leg 3 and the seat frame 21, respectively. The first link 41 is provided with a locking member 43 to control the relative fixation of the first link 41 and the second link 42. Controlling the extension and retraction of the first link 41 and the second link 42 can adjust the overall length of the transmission link 4, thereby adjusting the relative angle between the support leg 3 and the backrest 22 when the folding recliner is unfolded. The locking member 43 and the telescopically configurable first link 41 and second link 42 facilitate the user's adjustment of the overall length of the transmission link 4, thereby adjusting the relative angle between the support leg 3 and the backrest 22 when the folding recliner is unfolded. This makes it convenient for the user to use the folding recliner on uneven ground, and the telescopically configurable first link 41 and second link 42 facilitate the flexible adjustment of the transmission link 4, allowing the folding recliner to be placed stably on different ground surfaces.

[0044] In this invention, the first rod 41 and the second rod 42 are respectively provided with strip grooves 413, and the first rod 41 and the second rod 42 are respectively detachably provided with locking members 43. The locking members 43 pass through the strip grooves 413 and are connected to the first rod 41 or the second rod 42, thereby making the first rod 41 and the second rod 42 abut against each other and fixing the first rod 41 and the second rod 42 relatively. Loosening the locking members 43 allows the first rod 41 and the second rod 42 to slide relative to each other. The locking members 43 can slide along the strip grooves 413. The arrangement of the two sets of strip grooves 413 and locking members 43 is conducive to the stable sliding of the first rod 41 and the second rod 42, and is conducive to improving the stability of the connection between the first rod 41 and the second rod 42, and avoiding bending and damage to the first rod 41 and the second rod 42.

[0045] In this embodiment, the first rod 41 includes a straight rod portion 411 and a bent portion 412. The bent portion 412 is inclined toward the straight rod portion 411. The straight rod portion 411 is rotatably connected to the support foot 3. The strip groove 413 on the first rod 41 is provided on the bent portion 412 and is inclined toward the straight rod portion 411. The bent portion 412 and the strip groove 413 inclined toward the straight rod portion 411 make the force direction of the first rod 41 and the sliding direction of the second rod 42 inclined, which is conducive to the stable installation of the first rod 41 and the second rod 42, avoids the first rod 41 and the second rod 42 from sliding accidentally during use, and facilitates user use.

[0046] The seat frame 21 of this invention has a first hinge part 211 on its upper side. The backrest 22 is rotatably connected to the first hinge part 211, and the backrest 22 is rotatably positioned above the seat frame 21. The seat frame 21 extends to the rear side of the first hinge part 211 to form a connecting part 213. The connecting part 213 is rotatably connected to the transmission link 4, so that the transmission link 4 is positioned below the backrest 22. The arrangement of the first hinge part 211 and the connecting part 213 ensures that the transmission link 4 is positioned below the backrest 22, avoiding contact between the transmission link 4 and the user during use, thus affecting the comfort of the folding recliner. This structure also prevents the transmission link 4 from getting caught on the user or the user's clothing during the unfolding and folding of the folding recliner, making it convenient for the user to use.

[0047] The support frame 1 includes a front leg rod 11 and a rear leg rod 12 rotatably connected. The front leg rod 11 is rotatably connected to the seat frame 21. A support link 5 is provided between the rear leg rod 12 and the seat frame 21. The support link 5 is rotatably connected to both the rear leg rod 12 and the seat frame 21. The front leg rod 11, rear leg rod 12, support link 5, and seat frame 21 are connected to form a four-bar linkage. When the folding recliner is unfolded, the rear leg rod 12 can rest against the support link 5 and support the support link 5. The support link 5 and the seat frame 21 are connected to form a four-bar linkage. When the folding recliner is unfolded, the rear leg bar 12 can abut against the support link 5 and support the support link 5. This structure has a strong load-bearing capacity, which is conducive to the stable support of the support frame 1 on the bed 2. Moreover, when the folding recliner is unfolded, the rear leg bar 12 abuts against the support link 5 to form an integral part. The combination of the seat frame 21, the front leg bar 11, the rear leg bar 12, and the support link 5 forms a triangular structure, which is conducive to improving the stability of the connection between the support frame 1 and the seat frame 21.

[0048] In this invention, an armrest 6 is rotatably mounted on the rear leg bar 12. The armrest 6 is rotatably connected to the backrest 22. When the folding recliner is unfolded, the rear leg bar 12 abuts against the support link 5 and is fixed relative to the support link 5. The combination of the armrest 6, backrest 22, seat frame 21, rear leg bar 12, and support link 5 forms a four-bar linkage. This structure enables the folding of the support frame 1 and the folding of the bed 2 to be linked, facilitating the quick unfolding and folding of the folding recliner.

[0049] The support rod 5 is provided with a swing groove 51, and a retaining block 52 is provided on one side of the swing groove 51. The rear leg rod 12 is rotatably disposed in the swing groove 51, and the retaining block 52 is disposed on the upper side of the rear leg rod 12. When the folding recliner is unfolded and folded, the retaining block 52 can abut against the upper side of the rear leg rod 12. The setting of the swing groove 51 facilitates the stable connection between the support rod 5 and the rear leg rod 12. Moreover, since the retaining block 52 can abut against the upper side of the rear leg rod 12 when the folding recliner is unfolded and folded, it is beneficial to the stable unfolding and folding of the folding recliner.

[0050] The bed frame 2 also includes a leg frame 23 rotatably connected to the seat frame 21. The leg frame 23 and the backrest 22 are respectively set on both sides of the seat frame 21. An auxiliary link 7 is set between the leg frame 23 and the front leg rod 11. The seat frame 21, leg frame 23, auxiliary link 7 and front leg rod 11 are connected to form a four-bar linkage. The auxiliary link 7 is conducive to the stable unfolding of the leg frame. Since the seat frame 21, leg frame 23, auxiliary link 7 and front leg rod 11 are connected to form a four-bar linkage, it is convenient for the automatic unfolding and folding of the leg frame, which is convenient for the user. It can also prevent the leg frame from rotating freely during the use or storage and transportation of the folding recliner, which is convenient for the storage and transportation of the folding recliner.

[0051] In this embodiment, the lower front side of the seat frame 21 extends to form a second hinge portion 212, and the leg frame 23 is rotatably connected to the second hinge portion 212. Preferably, the bed frame 2 is a frame structure, and the seat frame 21, backrest 22 and leg frame 23 are all covered with support cloth 8. When the folding recliner is in use, the user sits or leans against the support cloth 8.

[0052] The auxiliary link 7 described in this utility model includes a third link 71 and a fourth link 72 that are slidably connected. The third link 71 and the fourth link 72 are rotatably connected to the leg frame 23 and the front leg 11, respectively. The third link 71 is provided with a plurality of positioning grooves 712 at intervals, and the fourth link 72 is provided with a positioning part 73 that is adapted to the positioning grooves 712. The positioning part 73 cooperates with different positioning grooves 712 to keep the auxiliary link 7 at different lengths. The slidably connected third link 71 and fourth link 72 make it easy for the user to adjust the relative angle between the leg frame and the seat frame 21 during use, which is beneficial to improving the comfort of the folding recliner.

[0053] In this embodiment, the third rod 71 is provided with a sliding groove 711, the fourth rod 72 is slidably disposed in the sliding groove 711, and the positioning groove 712 is disposed on the side of the sliding groove 711. In this structure, the positioning part 73 can be detachably disposed on the fourth rod 72. During the adjustment of the auxiliary connecting rod 7, the positioning part 73 needs to be detached from the fourth rod 72.

[0054] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A folding recliner's support leg linkage and retraction mechanism, comprising a bed body (2) and a support frame (1) for supporting the bed body (2), characterized in that: The bed frame (2) includes a foldable seat frame (21) and a backrest (22). A support frame (1) is set on the seat frame (21). A support leg (3) is rotatably set on the backrest (22). When the folding recliner is unfolded, the support leg (3) is set on the underside of the backrest (22) and can support the backrest (22). A transmission link (4) is connected between the support leg (3) and the seat frame (21). The transmission link (4) is rotatably connected to the support leg (3) and the seat frame (21) respectively. The seat frame (21), the backrest (22), the support leg (3) and the transmission link (4) are connected to form a four-bar linkage. The backrest (22) and seat frame (21) are unfolded relative to each other, and the transmission link (4) can drive the support leg (3) and backrest (22) to unfold relative to each other, so that the support leg (3) can support the backrest (22); the backrest (22) and seat frame (21) are folded relative to each other, and the transmission link (4) can drive the support leg (3) and backrest (22) to fold and close relative to each other. The transmission link (4) is a telescopic rod. The extension and retraction of the transmission link (4) can adjust the distance between the support foot (3) and the hinge position of the seat (21) and the transmission link (4); or, the transmission link (4) is provided with multiple mounting positions. The support foot (3) and the seat (21) can be installed in different mounting positions to adjust the distance between the support foot (3) and the hinge position of the seat (21) and the transmission link (4).

2. The supporting leg linkage retraction mechanism of a folding recliner according to claim 1, characterized in that: The transmission link (4) includes a telescopically configurable first rod (41) and second rod (42). The first rod (41) and second rod (42) are rotatably connected to the support foot (3) and the seat frame (21), respectively. The first rod (41) is provided with a locking member (43) to control the relative fixation of the first rod (41) and the second rod (42). The overall length of the transmission link (4) can be adjusted by controlling the extension and retraction of the first rod (41) and the second rod (42), thereby adjusting the relative angle between the support foot (3) and the backrest (22) when the folding recliner is unfolded.

3. The supporting leg linkage retraction mechanism of a folding recliner according to claim 2, characterized in that: The first rod (41) and the second rod (42) are respectively provided with strip grooves (413), and the first rod (41) and the second rod (42) are respectively provided with detachable locking members (43). The locking members (43) pass through the strip grooves (413) and are connected to the first rod (41) or the second rod (42), so that the first rod (41) and the second rod (42) abut against each other and fix the first rod (41) and the second rod (42) relatively. Loosening the locking members (43) allows the first rod (41) and the second rod (42) to slide relative to each other, and the locking members (43) can slide along the strip grooves (413).

4. The supporting leg linkage retraction mechanism of a folding recliner according to claim 3, characterized in that: The first rod (41) includes a straight rod portion (411) and a bent portion (412). The bent portion (412) is inclined toward the straight rod portion (411). The straight rod portion (411) is rotatably connected to the support foot (3). The strip groove (413) on the first rod (41) is provided on the bent portion (412) and is inclined toward the straight rod portion (411).

5. The supporting leg linkage retraction mechanism of a folding recliner according to claim 1, characterized in that: The transmission link (4) includes a first link (41) and a second link (42). The first link (41) and the second link (42) are rotatably connected to the support foot (3) and the seat frame (21), respectively. A locking member (43) is provided on the first link (41). Several fixing holes are provided at intervals in the extension direction of the second link (42). The overall length of the transmission link (4) is different when the locking member (43) cooperates with different fixing holes.

6. The supporting leg linkage retraction mechanism of a folding recliner according to claim 1, 2, 3, 4, or 5, characterized in that: The support frame (1) includes a front leg rod (11) and a rear leg rod (12) that are rotatably connected. The front leg rod (11) is rotatably connected to the seat frame (21). A support link (5) is provided between the rear leg rod (12) and the seat frame (21). The support link (5) is rotatably connected to the rear leg rod (12) and the seat frame (21) respectively. The front leg rod (11), the rear leg rod (12), the support link (5) and the seat frame (21) are connected to form a four-bar linkage. When the folding recliner is unfolded, the rear leg rod (12) can abut against the support link (5) and support the support link (5).

7. The supporting leg linkage and retraction mechanism of a folding recliner according to claim 6, characterized in that: The rear leg bar (12) is rotatably provided with an armrest (6), which is rotatably connected to the backrest (22). When the folding recliner is unfolded, the rear leg bar (12) abuts against the support link (5) and is fixed relative to the support link (5). The combination of the armrest (6), backrest (22), seat frame (21), rear leg bar (12), and support link (5) forms a four-bar linkage.

8. The supporting leg linkage retraction mechanism of a folding recliner according to claim 7, characterized in that: The support link (5) is provided with a swing groove (51), and a retaining block (52) is provided on one side of the swing groove (51). The rear leg rod (12) is rotatably disposed in the swing groove (51), and the retaining block (52) is disposed on the upper side of the rear leg rod (12). When the folding recliner is unfolded and folded, the retaining block (52) can abut against the upper side of the rear leg rod (12).

9. The supporting leg linkage retraction mechanism of a folding recliner according to claim 7 or 8, characterized in that: The bed frame (2) also includes a footrest (23) rotatably connected to the seat frame (21). The footrest (23) and the backrest (22) are respectively set on both sides of the seat frame (21). An auxiliary link (7) is provided between the footrest (23) and the front leg rod (11). The seat frame (21), footrest (23), auxiliary link (7) and front leg rod (11) are connected to form a four-bar linkage.

10. The supporting leg linkage and retraction mechanism of a folding recliner according to claim 9, characterized in that: The auxiliary link (7) includes a third link (71) and a fourth link (72) that are slidably connected. The third link (71) and the fourth link (72) are rotatably connected to the leg (23) and the front leg (11), respectively. The third link (71) is provided with a number of positioning grooves (712) at intervals. The fourth link (72) is provided with a positioning part (73) that is adapted to the positioning groove (712). The positioning part (73) cooperates with different positioning grooves (712) to keep the auxiliary link (7) at different lengths.

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