An adjustable leg support for a comfort chair

Abstract

This invention relates to the field of chair support technology, specifically to a leg adjustment bracket for a comfortable chair, comprising a leg rest and a seat frame. The seat frame has a leg rest mounting bracket, which includes a support rod and a leg rest mounting plate. The leg rest mounting plate is detachably connected to the seat frame. A leg rest connecting plate is located at the front of the leg rest mounting plate, with its upper end movably connected to the leg rest mounting plate and its lower end connected to the leg rest. A drive mechanism is located at the bottom of the seat frame, comprising a push plate and a telescopic drive element that controls the push plate's forward and backward movement. The rear end of the telescopic drive element is movably connected to the bottom of the seat frame, and its output end connects to the front of the push plate, pushing the push plate forward and backward. The front end of the push plate is movably connected to the upper end of the leg rest. The leg support length can change with the tilt angle, ensuring safety and reliability. The leg support opens smoothly and is easy to assemble and disassemble from the seat frame, greatly improving its usability.

Description

Technical Field

[0001] This invention relates to the field of chair support technology, and more specifically to a leg adjustment bracket for a comfort chair. Background Technology

[0002] A leisure and comfort chair is a chair used to enjoy leisure time or relieve fatigue. It has multiple adjustable functions and can bring people a sense of relaxation and comfort.

[0003] The main adjustment functions of a comfortable leisure chair include backrest tilt adjustment, headrest angle adjustment, and leg rest (or footrest) angle adjustment. These adjustment functions rely on the chair's frame. For example, leg rest adjustment depends on the adjustment of the leg rest bracket. Generally, the leg rest bracket is movably connected to the seat frame, with a drive mechanism in the seat frame controlling the leg rest bracket. The leg rest bracket and seat frame are typically connected by a pin, which is difficult and inconvenient during production and assembly. Importantly, a single drive mechanism can only adjust the leg rest bracket angle, resulting in a limited functionality. To achieve other adjustment functions, such as extension, a separate leg rest extension drive mechanism is needed, making the structure more complex and increasing production costs. Furthermore, existing leg rest brackets suffer from poor stability during adjustment, affecting the overall user experience. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a leg adjustment bracket for a comfortable chair that addresses the above-mentioned defects. The length of the leg bracket can change with the tilt angle. When the leg bracket is extended, it will not interfere with the ground, making it safe and reliable. The leg bracket opens smoothly, has a stable structure, and is easy to assemble and disassemble with the seat frame, greatly improving the user experience.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows:

[0006] A leg adjustment bracket for a comfort chair includes a leg rest and a seat frame supporting the leg rest. The seat frame has a leg rest mounting bracket for connecting the leg rest. The leg rest mounting bracket includes a support rod and leg rest mounting plates on both sides of the support rod. The leg rest mounting plates are detachably connected to the seat frame. A leg rest connecting plate is located at the front of each leg rest mounting plate. The upper end of the connecting plate is movably connected to the leg rest mounting plate, and the lower end of the connecting plate is connected to the leg rest. The bottom of the seat frame has a drive mechanism for driving the leg rest to flip forward. The drive mechanism includes a push plate and a telescopic drive element that controls the forward and backward movement of the push plate. The rear end of the telescopic drive element is movably connected to the bottom of the seat frame. The output end of the telescopic drive element is connected to the front of the push plate, pushing the push plate forward and backward. The front end of the push plate is movably connected to the upper end of the leg rest. Moving the push plate forward controls the leg rest to flip forward and open; moving the push plate backward controls the leg rest to flip forward and open. The leg support is retracted. The bottom of the seat frame is equipped with a guide and limiting mechanism to guide and limit the forward and backward movement of the push plate. The leg support is equipped with a movable sub-support. The leg support is equipped with a linkage mechanism that drives the sub-support to slide open or close as the leg support is opened or closed. The linkage mechanism includes a first link, a second link, and a third link connected in sequence. The middle part of the second link is movably connected to the leg support through a pin. The upper end of the first link is movably connected to the seat frame through a first joint bearing. The lower end of the first link is connected to one end of the second link through a second joint bearing. The upper end of the third link is movably connected to the other end of the second link. The lower end of the third link is movably connected to the sub-support. In the initial stage of the leg support flipping, the sub-support does not slide out, and the length of the leg support remains unchanged. The sub-support only slides out after the leg support is opened to a certain angle.

[0007] Furthermore, there are two push plates, which are symmetrically arranged at the bottom of the seat frame. The telescopic drive element is an electric push rod, which is located on the side of one of the push plates. The push plate corresponding to the front of the output end of the telescopic drive element has an inwardly bent portion. The bent portion causes the rear of the push plate to be offset towards the inside of the seat frame, forming an installation space for the telescopic drive element. A side plate is provided on the outside of the bend of the push plate. The front end of the side plate is connected to the push plate in front of the bend by a pin, and the rear end of the side plate is connected to the push plate in rear of the bend by a pin. The output end of the electric push rod is connected to the pin.

[0008] Furthermore, the support rod and the leg support mounting plate are rotatably coupled, and the support rod is provided with a connecting plate extending to the rear and downward side, with the rear end of the connecting plate being movably connected to the front part of the push plate.

[0009] Furthermore, the leg support mounting plate and the seat frame are detachably connected by screws or bolts.

[0010] Furthermore, the guide limiting mechanism includes a guide hole at the rear of the push plate and a guide wheel at the bottom of the base frame. The guide hole is an oblong hole along the moving direction of the push plate. The guide wheel is inserted into the guide hole and slides with the guide hole. The position of the guide wheel is fixed. The end of the guide wheel contacts the guide hole to limit the forward and backward movement of the push plate.

[0011] Furthermore, the sub-bracket has sliding grooves on its left and right sides, and the leg bracket has protrusions that are embedded in and slide in the sliding grooves.

[0012] Furthermore, the diameter of the guide wheel that is inserted into the guide hole is the same as the width of the guide hole.

[0013] Furthermore, the front part of the seat frame is provided with a connecting protrusion that connects to the upper end of the first connecting rod.

[0014] The beneficial effects of this invention are as follows: Using the above-mentioned solution, the leg support and seat frame are connected by structural bolts or screws, greatly facilitating assembly, production, and subsequent maintenance, thus improving production efficiency and reducing maintenance difficulty. During the rotation of the leg support, the three-bar linkage drives the auxiliary support to slide on the leg support as it rotates, allowing the length of the leg bracket to change dynamically with the rotation angle. The opening of the auxiliary support does not require additional driving components, resulting in low cost. When the leg support rotates to a certain angle, the three-bar linkage controls the auxiliary support to slide open. The opening of the auxiliary support will not interfere with the ground, making it safer and more reliable. This leg bracket has the function of automatically extending after opening to a suitable angle, improving the usability. Push rods on both sides push the leg support, and the rear of the push rods is limited and guided by guide wheels at the bottom of the seat frame, greatly improving the stability of the leg support during rotation, making the rotation movement of the leg adjustment bracket smoother, and improving the structural stability and firmness of the leg adjustment bracket. This significantly reduces the force on the electric push rod, protecting it and extending the service life of the leg adjustment bracket. Attached Figure Description

[0015] The foregoing and other objects, features and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of one embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the seat frame in one embodiment of the present invention.

[0018] Figure 3 This is a side view of the seat frame in one embodiment of the present invention.

[0019] Figure 4 This is a side view of the seat frame in one embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the leg support frame in one embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the cross-sectional structure of the leg bracket in one embodiment of the present invention.

[0022] Wherein: 1 is the leg support, 11 is the first joint bearing, 111 is the second joint bearing, 12 is the convex plate, 121 is the slide groove, 13 is the connecting protrusion, 2 is the seat frame, 3 is the support rod, 31 is the connecting block, 32 is the support plate, 4 is the leg support mounting plate, 5 is the leg support connecting plate, 6 is the push plate, 61 is the guide hole, 7 is the electric push rod, 7 is the side plate, 8 is the side plate, 81 is the pin, 9 is the guide wheel, 10 is the auxiliary support, 101 is the first connecting rod, 102 is the second connecting rod, and 103 is the third connecting rod. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] The preferred embodiments described below are merely examples, and other obvious variations will be apparent to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0025] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0026] Reference Figure 1 , Figure 2A leg adjustment bracket for a comfortable chair includes a leg support 1 and a seat frame 2 supporting the leg support 1. The seat frame 2 has a leg support mounting bracket for connecting the leg support 1. The leg support mounting bracket includes a support rod 3 and leg support mounting plates 4 on both sides of the support rod 3. The leg support mounting plates 4 are detachably connected to the front end of the seat frame 2 by screws. A leg support connecting plate 5 is provided at the front of the leg support mounting plate 4. The upper end of the leg support connecting plate 5 is connected to the leg support mounting plate 4 by a connecting pin or bolt. The lower end of the leg support connecting plate 5 is movably connected to the upper side of the leg support 1 by a connecting pin or screw. The leg support mounting plate 4 has multiple screw holes. The front of the seat frame 2... The system includes an installation structure that mates with the leg support mounting plate 4. The leg support mounting plate 4 is fixed to the seat frame using multiple screws. The connection structure is simple, enabling quick installation of the leg support. The screw connection is low-cost and easy to assemble, reducing the difficulty of producing and maintaining the leg adjustment bracket. The function of the leg support connecting plate 5 is to avoid direct connection between the leg support and the seat frame, increasing the distance between the leg support and the seat frame. A certain distance is maintained between the upper part of the leg support and the end of the seat frame. This distance provides sufficient space for the leg support to rotate, preventing interference between the upper part of the leg support and the front part of the seat frame during rotation, and ensuring the smooth rotation of the leg support.

[0027] The two ends of the support rod 3 are rotatably engaged with the leg support mounting plate 4. The support rod 3 is a square tube, and connecting blocks 31 are sleeved on both ends of the support rod 3. The outer circumferential surface of the connecting block 31 is a circular surface, and the connecting block 31 has a square inner hole that connects and engages with the support rod 3. This structure allows the support rod 3 to rotate freely when the leg support mounting plate is fixed, which facilitates better rotation of the leg support. (Refer to...) Figure 3 , Figure 4The bottom of the seat frame 2 is equipped with a drive mechanism for driving the leg bracket 1 to flip forward. The drive mechanism includes two push plates 6 and an electric push rod 7 that controls the forward and backward movement of the push plates 6. The rear end of the electric push rod 7 is hinged to the bottom of the seat frame 2. The two push plates 6 are symmetrically arranged on the left and right sides of the bottom of the seat frame. The push plates 6 are arranged along the front and rear direction of the seat frame, that is, the length direction of the push plates is consistent with the front and rear direction of the seat frame. The connecting protrusion 13 extends from the upper rear side of the leg bracket 1, and the front end of the push plate 6 extends to... At the upper end of the leg bracket 1, and with the front end of the push plate 6 hinged to the connecting protrusion 13, the support rod 3 is provided with an arc-shaped support plate 32 extending backward and downward. The support plate 32 is fixedly connected to the square support tube 3. The rear end of the support plate 3 is movably connected to the front part of the push plate 6 by a pin. The push plate 7 moves back and forth, pushing the leg bracket 1 and the support plate 32 forward. The upper end of the support plate 32 is fixed. The support plate 32 is pushed and swung by the push plate 7 around the support plate. The support plate 32 is an arc-shaped structure protruding towards the front of the seat frame. The swing of the support plate causes a change in the motion state of the push plate. The front part of the push plate changes from a forward-backward movement to a combined forward-backward and up-down movement, resulting in an arc-shaped motion. Specifically, as the push plate moves forward, its front part first sinks and then lifts upward, causing the force exerted by the push plate on the leg support to separate forward and upward, thus pushing the leg support to flip and open to the front. When the push plate moves backward, it exerts a backward and downward force on the leg support, pulling the leg support to close and reset better. The support plate 32 guides the movement of the front part of the push plate, slightly changing the direction of the push plate's movement, allowing the leg support to flip more smoothly. The support plate guides the movement of the push plate and transforms the force exerted on the push plate. The support plate transforms the forward-backward movement of the push plate into a combined forward-backward and up-down movement. The force exerted by the push plate on the leg support can both achieve the flipping of the leg support and protect the leg support, preventing it from being damaged by being pushed or pulled, effectively extending the service life of the leg adjustment bracket.

[0028] Reference Figure 4 The push plate 7 moves back and forth, pushing the leg bracket to flip up and down. The electric push rod 7 is set on the side of one of the push plates 6. The front plate of the push plate 6 has a bent part that bends inward toward the seat frame 2. The bent part causes the rear plate of the push plate to be offset toward the inward of the seat frame, forming an installation space for the electric push rod. The bent part makes the push plate 6 form a "Z"-shaped structure in cross-section. (Refer to...) Figure 4The output end of the electric push rod 7 extends to the bend of the push plate 6. The bend provides installation space for the electric push rod, allowing for a perfect fit between the electric push rod and the push plate. Within the limited lateral range of the seat frame, the space occupied by the push plate and electric push rod is reduced, resulting in a compact overall structure and improving the overall size and aesthetics of the comfortable chair frame. A side plate 8 is located on the outer side of the bend of the push plate 6. The front end of the side plate 8 is connected to the front of the push plate 6 via a pin, and the rear end of the side plate 8 is connected to the rear of the push plate 6 via a pin 81. The pin 81 is parallel to the pin at the front of the side plate 8 and is positioned along the left-right direction of the seat frame. The output end of the electric push rod 7 is connected to the pin 81. The pin 81, the side plate 8, the pin at the front of the side plate, and the push plate form a parallelogram, enabling the electric push rod to... The connection between the output end of rod 7 and the push plate remains stable. During the push of electric push rod 7, the side plate and push plate remain stable, and the pin shaft 81 remains perpendicular to the push plate, so that the push direction of electric push rod does not deviate. The driving force of electric push rod is always consistent with the running direction of push plate, reducing driving force loss. More importantly, it improves the smoothness of electric push rod pushing push plate, so that the flipping opening or closing of leg bracket maintains good stability, improves the stability of leg adjustment bracket, has good use effect and good stability, and promotes extended service life. This structure is also easy to assemble and helps to improve production efficiency. Electric push rod 7 controls push plate 6 to move forward. The front end of push plate 6 pushes the convex plate of leg bracket, so that leg bracket 1 flips upward and opens with its upper end connected to the leg bracket connecting plate as the axis. Electric push rod pulls push plate 6 to move backward, and leg bracket flips downward and closes.

[0029] To ensure the directional movement of the push plate and control its stroke, a guide hole 61 extending along the length of the push plate is provided at the rear of the push plate 6. A limiting plate extending downward is provided at the bottom of the base frame 2, and a guide wheel 9 is provided at the bottom end of the limiting plate. The guide wheel 9 is inserted into the guide hole 61, which is an oblong hole along the length of the push plate. The guide wheel 9 contacts the front and rear ends of the guide hole 61 to limit the forward and backward movement of the push plate. The contact between the guide wheel 9 and the front end of the guide hole 61 restricts the forward stroke of the push plate, thereby limiting the opening angle of the leg bracket. The contact between the guide wheel 9 and the rear end of the guide hole 61 restricts the backward stroke of the push plate, thereby limiting the closing degree of the leg bracket.

[0030] The guide wheel 9 has an I-shaped cross-section. The diameter of the guide wheel 9 in the contact area with the guide hole is the same as the opening width of the guide hole 61, thus confining the guide wheel 9 within the guide hole 61. Since the position of the guide wheel is fixed, as the push plate moves back and forth, the guide wheel slides within the guide hole, guiding and restricting the movement trajectory of the push plate. This makes the opening and closing movement of the leg bracket smoother. The guide wheel and guide hole fit tightly, with no longitudinal clearance. The guide wheel provides support to the rear side of the push plate, and the leg... During operation and use, the front of the push plate is connected to the leg bracket, and the middle of the push plate is connected to the electric push rod. The push plate is subjected to force, and the guide wheel supports the rear of the push plate, thus distributing the force and keeping the push plate stable during operation. This makes the push plate structure more stable and robust, improving its resistance to wear and tear. The guide wheel is rotatable, and the fit between the guide wheel and the guide hole has minimal wear. The I-shaped structure of the guide wheel 9 ensures that the guide wheel is securely locked in the guide hole, guaranteeing effective fit and improving the structural stability of the push plate.

[0031] Reference Figure 5 The leg support 1 has a movable sub-support 10. The leg support 1 has a linkage mechanism that drives the sub-support 10 to slide open or retract as the leg support 1 opens or retracts. The linkage mechanism includes a first link 101, a second link 102, and a third link 103 connected in sequence. To reduce weight, both the leg support 1 and the sub-support 10 are frame structures. The middle of the leg support 1 has a connecting plate. The middle of the second link 102 is movably connected to the middle of the connecting plate on the leg support by a pin. The upper end of the first link 101 is movably connected to the seat frame 2 by a first joint bearing 11. The corresponding position of the seat frame 2 is provided with a connecting protrusion that connects to the first joint bearing 11. The connecting protrusion fixes the position of the first joint bearing 11 and keeps the upper end of the first connecting rod stationary. The connecting protrusion facilitates the control of the position of the first joint bearing, thereby adjusting the flipping state of the first connecting rod and adjusting the timing of the opening of the sub-bracket. The lower end of the first connecting rod 101 is connected to the right end of the second connecting rod 102 through the second joint bearing 111. The upper end of the third connecting rod 103 is movably connected to the left end of the second connecting rod 102. The lower end of the third connecting rod 103 is hinged to the upper end of the sub-bracket 10.

[0032] An electric actuator pushes a push plate forward, which in turn causes the leg support to flip open. During this opening process, the lower end of the first link is connected to a second link fixed to the leg support, causing the first link to flip synchronously with the leg support. Since the upper end of the first link is connected to the seat frame and remains fixed, its lower end is pulled upwards along the leg support, pulling the right end of the second link upwards along the leg support. Because the middle of the second link is movably connected to the leg support, its left end moves downwards along the leg support frame. This, in turn, pushes the third link downwards along the leg support frame. Since the lower end of the third link is connected to the sub-support, this... The sub-bracket is pushed out from the leg support, enabling the leg adjustment bracket to flip, open, and extend, thus improving support for the legs. As the first link flips gradually along with the leg support, its lower end gradually rises, albeit slightly. Only when the first link flips to a certain angle, i.e., its bottom end rises to a certain angle, will the second link be pulled. This prevents the sub-bracket from sliding out during the initial flipping phase, maintaining the leg support's length. The sub-bracket only slides out after the leg support has opened to a certain angle. The three-bar structure helps regulate the timing of the sub-bracket's slide-out, preventing it from hitting the ground and causing damage during the initial opening phase. The leg support opens more smoothly. This footrest bracket also automatically extends after opening to a suitable angle, resulting in better performance.The electric push rod moves backward, causing the leg support to close. During the closing process, the first connecting rod rotates and resets synchronously with the leg support. The lower end of the first connecting rod swings down, pulling the right end of the second connecting rod along the lower part of the leg support. The left end of the second connecting rod moves along the upper part of the leg support frame. Subsequently, the second connecting rod pushes the third connecting rod along the upper part of the leg support frame, pulling the auxiliary bracket to reset, thus realizing the rotation of this leg adjustment bracket. The three-bar linkage structure consisting of the first, second, and third levers eliminates the need for additional drive components when the sub-bracket is opened. The opening and resetting of the sub-bracket follow the rotation of the leg support. Compared to existing technologies, this simplifies the leg support structure and reduces manufacturing costs. The three-bar linkage ensures smooth opening and closing of the sub-bracket, facilitating the adjustment function of the leg support. The left end of the second lever is movably connected to the upper end of the third lever via a pin. The pins of the second and third levers are fitted with… The linkage is equipped with sleeves, and nuts are located at both ends of the pin. The pin enables the movable engagement of the second and third links. The sleeves are designed to accommodate the distance between the third and second links. Since the second and third links are not in the same plane, the sleeves ensure that the second and third links maintain their respective states during pulling, preventing axial misalignment and effectively reducing wear. Meanwhile, the first and second joint bearings 111 at both ends of the first link effectively reduce wear at the connection points. During operation, because the first and second links are not in the same plane, the first link's body will deflect circumferentially. This can cause interference, wear, and even damage to the first link's body at the junction with the second link and the seat frame. The first and second joint bearings 111 effectively eliminate this deflection, resulting in smoother operation of the three-bar linkage.

[0033] Reference Figure 6 The leg support 1 has protruding plates 12 on both sides, and the sub-support 10 has sliding grooves 121 on both sides. The protruding plates are embedded in the sliding grooves 121 and maintain sliding cooperation with the sliding grooves to realize the sliding of the sub-support on the leg support.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A leg adjustment bracket for a comfort chair, comprising a leg rest and a seat frame supporting the leg rest, characterized in that, The seat frame is equipped with a leg support mounting bracket for connecting the leg support frame. The leg support mounting bracket includes a support rod and leg support mounting plates on both sides of the support rod. The support rod and the leg support mounting plates are rotatably connected. The leg support mounting plates are detachably connected to the seat frame. A leg support connecting plate is provided at the front of the leg support mounting plate. The upper end of the leg support connecting plate is movably connected to the leg support mounting plate, and the lower end of the leg support connecting plate is connected to the leg support frame. The bottom of the seat frame is equipped with a drive mechanism for driving the leg support frame to flip forward. The drive mechanism includes a push plate and a telescopic drive element that controls the forward and backward movement of the push plate. The rear end of the telescopic drive element is movably connected to the bottom of the seat frame. The output end of the telescopic drive element is connected to the front of the push plate to push the push plate to move forward and backward. The front end of the push plate is movably connected to the upper end of the leg support frame. An arc-shaped support plate extending backward and downward is provided on the support rod. The support plate is fixedly connected to the support rod, and the rear end of the support plate is movably connected to the front of the push plate. The push plate moves forward and pushes the leg support frame and the support plate. The swing of the support plate guides the forward movement of the push plate, thereby pushing the leg support frame to flip forward and open. The leg support is retracted by pulling the plate backward. The bottom of the seat frame is equipped with a guide and limiting mechanism to guide and limit the forward and backward movement of the push plate. The leg support has a movable sub-support. The leg support has a linkage mechanism that drives the sub-support to slide open or close as the leg support opens or closes. The linkage mechanism includes a first link, a second link, and a third link connected in sequence. The middle of the leg support has a connecting plate. The middle of the second link is movably connected to the middle of the connecting plate on the leg support by a pin. The upper end of the first link is movably connected to the seat frame by a first joint bearing. The front of the seat frame has a connecting protrusion connecting the upper end of the first link. The lower end of the first link is connected to the right end of the second link by a second joint bearing. The upper end of the third link is movably connected to the left end of the second link. The lower end of the third link is movably connected to the upper end of the sub-support. In the initial stage of the leg support flipping, the sub-support does not slide out, and the length of the leg support remains unchanged. The sub-support only slides out after the leg support is opened to a certain angle.

2. The leg adjustment bracket of a comfort chair according to claim 1, characterized in that, The number of push plates is two, and the two push plates are symmetrically arranged at the bottom of the seat frame. The telescopic drive element is an electric push rod, which is set on the side of one of the push plates. The push plate corresponding to the front of the output end of the telescopic drive element has an inwardly bent part. The bent part causes the rear part of the push plate to be offset towards the inside of the seat frame to form an installation space for the telescopic drive element. A side plate is provided on the outside of the bend of the push plate. The front end of the side plate is connected to the push plate in front of the bend by a pin, and the rear end of the side plate is connected to the push plate in rear of the bend by a pin. The output end of the electric push rod is connected to the pin.

3. The leg adjustment bracket of a comfort chair according to claim 1, characterized in that, The leg support mounting plate and the seat frame are detachably connected by screws or bolts.

4. The leg adjustment bracket of a comfort chair according to claim 1, characterized in that, The guide limiting mechanism includes a guide hole at the rear of the push plate and a guide wheel at the bottom of the base frame. The guide hole is an oblong hole along the moving direction of the push plate. The guide wheel is inserted into the guide hole and slides with the guide hole. The position of the guide wheel is fixed. The end of the guide wheel contacts the guide hole to limit the forward and backward movement of the push plate.

5. The leg adjustment bracket of a comfort chair according to claim 1, characterized in that, The auxiliary bracket has sliding grooves on both the left and right sides, and the leg bracket has a protruding plate that is embedded in and slides with the sliding groove.

6. The leg adjustment bracket of a comfort chair according to claim 4, characterized in that, The diameter of the guide wheel that is inserted into the guide hole is the same as the width of the guide hole.

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