Footrest telescopic mechanism, footrest device and chair thereof

Abstract

The invention relates to a footrest telescoping mechanism, a footrest device and a chair thereof.The footrest telescoping mechanism comprises a fixing frame and a telescopic pipe, the telescopic pipe is arranged on the fixing frame in a sliding mode, the fixing frame is further provided with a driving part, and the driving part directly or indirectly drives the telescopic pipe to move in the fixing frame; the fixing frame is further provided with a shifting wrench used for limiting the position of the telescopic pipe. The telescopic pipe in the footrest telescopic mechanism is driven by the driving part to move in the fixing frame, the position of the telescopic pipe is kept to be fixed through the shifting wrench, the telescopic pipe can extend forwards under the driving of the driving part only by pulling the shifting wrench during operation, and the operation convenience is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of furniture, and in particular relates to a footrest telescopic mechanism, a footrest device and a chair thereof. Background Art

[0002] Leisure chairs are one of the essential furniture in home offices. People spend most of their time sitting on chairs to work during long periods of rest and relaxation. Sitting for a long time can easily lead to physical fatigue, so people often lie on chairs to rest. However, when lying on a chair, people's feet do not have a suitable place to place, making it uncomfortable for people to lie on the chair. Therefore, more and more chairs are designed with a footrest at the bottom, which can make the legs flat and promote blood circulation.

[0003] There are roughly two structures of chairs with footrests on the market: one is a pull-out footrest that can be pulled forward and backward for use or hidden; the other is a flip-up footrest that can be flipped over so that the footrest can be flipped open for use or closed at the bottom of the seat.

[0004] At present, whether the seat with a footrest structure adopts a pull-out footrest or a flip-up footrest, it needs to be manually operated by the user, which is cumbersome and cannot meet the requirement of fast folding and unfolding of the footrest. Summary of the invention

[0005] In order to solve the above technical problems, the first object of the present invention is to provide a footrest retractable mechanism, which can realize the function of automatic extension of the footrest; the second object of the present invention is to provide a footrest device, and the second object of the present invention is to provide a chair.

[0006] In order to achieve the first object of the above invention, the present invention adopts the following technical solutions:

[0007] The footrest telescopic mechanism comprises a fixing frame and a telescopic tube, wherein the telescopic tube is slidably arranged on the fixing frame, the fixing frame is also provided with a driving member, the driving member directly or indirectly drives the telescopic tube to move in the fixing frame, and the fixing frame is also provided with a toggle wrench for limiting the position of the telescopic tube.

[0008] As a preferred solution: the movable end of the driving member is connected to the telescopic tube to drive the telescopic tube to move.

[0009] As a preferred solution: the telescopic tube is located at the end of the fixing frame, the driving member is arranged along the length direction of the fixing frame, and the movable end of the driving member drives the telescopic tube to move through a pull rope.

[0010] As a preferred solution: the driving member is a gas rod, an electric push rod or a spring, the fixed end of the gas rod, electric push rod or spring is close to the telescopic tube, a fixed block is also fixed to one end of the telescopic tube, a guide wheel is also provided on one side of the gas rod, electric push rod or spring, one end of the pull rope is clamped on the fixed block, the other end of the pull rope passes around the guide wheel and is fixed to the movable end of the gas rod, electric push rod or spring, and when the gas rod, electric push rod or spring is extended, the telescopic tube is driven to extend through the pull rope.

[0011] As a preferred solution: the movable end of the gas rod, electric push rod or spring is also provided with a freely rotating roller, and a pull rope fixing block and a guide wheel are respectively provided on both sides of the gas rod, electric push rod or spring on the fixed frame, and a fixing block is also fixed to one end of the telescopic tube, one end of the pull rope is clamped on the fixing block, and the other end of the pull rope is clamped on the pull rope fixing block after passing through the guide wheel and roller. When the gas rod, electric push rod or spring is extended, the pull rope drives the telescopic tube to extend.

[0012] As a preferred solution: the upper end surface of the fixing frame is provided with a groove, the gas rod or spring is fixed in the groove, and the side wall of the groove of the fixing frame is also provided with a notch for the pull rope to pass through, and the pull rope fixing block, roller, guide wheel and the position of the bayonet for clamping the pull rope on the fixing block are in the same plane.

[0013] As a preferred solution: through holes are provided at both ends of the fixing frame, two telescopic tubes are respectively inserted into the two through holes, a through hole is also provided on the lower end surface of the through hole on the fixing frame, a positioning block is fixed to the bottom front end of the telescopic tube, a limiting protrusion is also provided on the toggle wrench, the toggle wrench is hinged at one end of the fixing frame, and a spring A is provided between the toggle wrench and the fixing frame, under the action of the spring A, the toggle wrench is always against the bottom of the fixing frame, and the limiting protrusion passes through the through hole and is stuck at the positioning block.

[0014] As a preferred solution: both ends of the fixing frame are provided with through holes, two telescopic tubes are respectively inserted into the two through holes, and the upper and lower end surfaces of the through holes are also provided with pulleys and support wheels, which act on the upper and lower end surfaces of the telescopic tubes respectively.

[0015] In order to achieve the second purpose of the above invention, the present invention adopts the following technical solutions:

[0016] The footrest device adopts any one of the footrest telescopic mechanisms described above.

[0017] In order to achieve the third object of the above invention, the present invention adopts the following technical solutions:

[0018] The chair is characterized by adopting the footrest device as described above.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The telescopic tube in the telescopic mechanism of the footrest of the present invention is driven by a driving member to move in a fixed frame, and the position of the telescopic tube is kept fixed by a toggle wrench. During operation, the toggle wrench only needs to be pulled to make the telescopic tube extend forward under the drive of the driving member, thereby greatly improving the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0022] Figure 1 and Figure 2 It is a schematic diagram of the structure of the footrest device of the present invention in two different angles when it is in a folded state;

[0023] Figure 3 and Figure 4 1 is a schematic diagram of the structure of the footrest device of the present invention in two different angles when it is in an extended and unfolded state;

[0024] Figure 5 and Figure 6 It is a schematic diagram of the structure of the footrest telescopic mechanism of the present invention at two different angles;

[0025] Figure 7 , Figure 8 and Fig. 9 It is a schematic diagram of the structure of the footrest flipping mechanism of the present invention at three different angles;

[0026] Fig.10 It is a schematic diagram of the assembly structure of the sliding block, the unlocking knob and the bottom plate of the present invention;

[0027] Fig.11 is a schematic cross-sectional structural diagram of the footrest device of the present invention in a retracted and folded state;

[0028] Fig.12 It is a schematic cross-sectional structural diagram of the footrest device of the present invention in an extended and unfolded state.

[0029] The accompanying drawings are marked as follows: 110, fixed frame; 111, rope fixing block; 112, guide wheel; 113, pulley; 114, support wheel A; 115, support wheel B; 120, telescopic tube; 121, fixed block; 122, positioning block; 130, gas rod; 131, roller; 140, rope; 150, toggle wrench; 151, support shaft; 152, lower buckle plate; 153, spring A; 154, limit protrusion; 160, limit block; 170, telescopic rod; 180, spring B; 200, rotating seat; 201, accommodating cavity; 202 connecting column; 210, support frame; 211, buckle cover; 212, flip lock hole A; 213, torsion spring bayonet; 214, flip lock hole B; 220, footrest; 221, limit opening; 230, unlocking knob; 231, connecting ball head; 240, bottom plate; 241, supporting column; 250, rotating block; 251, limit notch; 260, torsion spring; 270, sliding block; 271, spring C; 272, locking rod; 273, connecting strip; 274, spherical recess; 280, bearing; 290, locking screw. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] In addition, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0037] like Figures 1 to 6 As shown, the footrest device includes a footrest telescopic mechanism and a footrest flipping mechanism, and the footrest flipping mechanism is arranged at the front end of the footrest telescopic mechanism; the footrest telescopic mechanism includes a fixed frame 110 and a telescopic tube 120, and the telescopic tube 120 is slidably arranged on the fixed frame 110, and the fixed frame 110 is also provided with a driving component, and the driving component directly or indirectly drives the telescopic tube 120 to move in the fixed frame 110, and the fixed frame 110 is also provided with a toggle wrench 150 for limiting the position of the telescopic tube 120.

[0038] In order to make the entire footrest telescopic mechanism more stable during movement, the fixed frame 110 and the telescopic tube 120 are arranged perpendicular to each other, and through holes are provided at both ends of the fixed frame 110. The two telescopic tubes 120 are respectively inserted into the two through holes. The upper and lower end surfaces of the through holes are also provided with pulleys 113 and support wheels. The support wheels in contact with the lower end surfaces of the two telescopic tubes 120 are support wheels A114 and support wheels B115. The pulleys 113 and the support wheels act on the upper and lower end surfaces of the telescopic tubes 120, respectively, so that the telescopic tubes 120 move more smoothly in the fixed frame 110. The two telescopic tubes 120 are connected to each other. In this embodiment, the two telescopic tubes 120 are connected together through the footrest flipping mechanism.

[0039] The upper end surface of the fixed frame 110 is provided with a groove, and the driving device is fixed in the groove. The driving device drives the telescopic tube 120 to move through the pull rope 140. The driving device is a gas rod 130, and the gas rod 130 is arranged along the length direction of the fixed frame 110, and the fixed end of the gas rod 130 is close to one of the telescopic tubes 120. A fixed block 121 is also fixed at one end of the telescopic tube 120. A guide wheel 112 is also provided on one side of the gas rod 130. One end of the pull rope 140 is clamped on the fixed block 121, and the other end of the pull rope 140 is fixed to the movable end of the gas rod 130 by passing around the guide wheel 112.

[0040] In order to make the movement of the pull rope 140 smoother, the movable end of the gas rod 130 is also provided with a freely rotating roller 131, and a pull rope fixing block 111 is also provided on the fixed frame 110 on the other side of the gas rod 130. The pull rope fixing block 111 and the guide wheel 112 are respectively located on both sides of the gas rod 130, and the guide wheel 112 is close to the fixed end of the gas rod 130. One end of the pull rope 140 is clamped on the fixing block 121, and the other end of the pull rope 140 is clamped on the pull rope fixing block 111 after passing through the guide wheel 112 and the roller 131. When the gas rod 130 is extended, the telescopic tube is driven to extend through the pull rope.

[0041] As a further preferred solution, a notch for the pull rope to pass through is further provided on the side wall of the groove of the fixing frame 110, and the positions of the clamping positions for clamping the pull rope on the pull rope fixing block 111, the roller 131, the guide wheel 112 and the fixing block 121 are in the same plane.

[0042] A through hole is also provided on the lower end surface of the through hole on the fixing frame 110, a positioning block 122 is fixed to the bottom front end of the telescopic tube 120, a limiting protrusion 154 is also provided on the toggle wrench 150, the toggle wrench 150 is hinged at one end of the fixing frame 110, and a spring A153 is provided between the toggle wrench 150 and the fixing frame 110, under the action of the spring A153, the toggle wrench 150 is always against the bottom of the fixing frame 110, and the limiting protrusion 154 passes through the through hole and is fixed at the positioning block 122.

[0043] The toggle wrench 150 is provided with a support shaft 151, and one end of the fixing frame 110 is provided with a slot, and the support shaft 151 is embedded in the slot. The bottom of the fixing frame 110 is also provided with a buckle plate 152, and the buckle plate 152 seals the toggle wrench 150 at the bottom of the fixing frame 110, and the spring A is arranged between the toggle wrench 150 and the buckle plate 152.

[0044] The toggle wrench 150 is pressed and rotated downward, so that the limiting protrusion 154 is separated from the positioning block 122, and the telescopic tube 120 is extended forward under the action of the gas rod 130 and the pull rope 140; when the telescopic tube 120 is retracted, the telescopic tube 120 is manually pushed backward until the positioning block 122 on the telescopic tube 120 is stuck in the limiting protrusion 154 of the toggle wrench 150.

[0045] When the telescopic tube 120 is retracted, the mating surface of the positioning block 122 and the limiting protrusion 154 is an inclined surface. In addition, in order to make the extended position of the telescopic tube 120 adjustable, a plurality of positioning blocks 122 can be arranged at a certain distance at the bottom of the telescopic tube 120.

[0046] In other embodiments, the driving device may adopt a spring, and the spring may directly replace the gas rod in the above-mentioned footrest telescopic mechanism, or the spring may be arranged in parallel with the telescopic tube to directly drive the extension of the telescopic tube. Of course, the gas rod in this embodiment may also adopt a structure arranged in parallel with the telescopic tube; in other embodiments, the driving device may also adopt a forward and reverse motor, and cooperate with transmission forms such as gears, racks, or screw rods and nuts; at this time, the toggle switch may be the switch of the forward and reverse motor.

[0047] like Figures 7 to 9 As shown, the footrest flipping mechanism includes a support frame 210 and a footrest 220 that are rotatably connected to each other, and a rotation limiting mechanism is provided between the two, and the footrest 220 can be flipped to a use state position and a storage state position relative to the support frame 210 through the rotation limiting mechanism; the rotation limiting mechanism includes a rotating seat 200, a accommodating cavity 201 is opened on the rotating seat 200, and the accommodating cavity 201 is also covered with a bottom plate 240, a telescopic member is provided in the accommodating cavity 201, and an unlocking knob 230 is also provided on the rotating seat 200, one end of the telescopic member is connected to the unlocking knob 230, and an elastic component is also provided in the accommodating cavity, under the action of the elastic component, the other end of the telescopic member passes through the rotating seat 200; the rotation limiting mechanism is fixed on one of the support frame 210 and the footrest 220, and a corresponding lock hole is provided on the other one, and when the footrest 220 is flipped to the use state position, the telescopic member is inserted into the lock hole.

[0048] A rotating block 250 is fixed to both ends of the rotating seat 200, and the rotating block 250 is fixed to the end of the rotating seat by a locking screw 290. A bearing 280 is sleeved on the rotating block 250, and the outer ring of the bearing 280 is embedded and fixed at both ends of the support frame 210 or the footrest 220. A torsion spring 260 is also sleeved on the rotating block 250, and a torsion spring bayonet 213 is also provided on the support frame 210 or the footrest 220. A limiting opening 221 is also provided at the end of the rotating seat, and the two torsion arms of the torsion spring 260 are respectively clamped in the torsion spring bayonet 213 and the limiting opening 221.

[0049] like Fig.10 As shown, the telescopic member includes a sliding block 270 and a locking rod 272. The sliding block 270 is a frame structure, which is formed as two rectangular frames connected together. The locking rod 272 is fixed to one end of the sliding block 270. The base plate 240 is fixed to the rotating seat 200 by screws. A connecting column 202 cooperating with the screw is also provided in the accommodating cavity 201 of the rotating seat. The connecting column 202 is a threaded column. The rectangular frame of the sliding block 270 is sleeved on the threaded column. The elastic component is a spring C271. The two ends of the spring C271 are respectively against the threaded column and the side walls of the rectangular frame. The spring C271 allows the locking rod 272 to pass through the rotating seat 200.

[0050] The other end of the sliding block 270 is integrally formed with a connecting strip 273, and a spherical recess 274 is provided on the connecting strip 273. The unlocking knob 230 includes an integrally formed handshake portion and a rotating shaft. The handshake portion is located on the end surface of the rotating shaft seat for easy operation. The rotating shaft is located in the accommodating cavity 201. A supporting column 241 is provided on the bottom plate 240. The rotating shaft is sleeved on the supporting column 241 and is arranged to rotate relative to the supporting column 241. A connecting ball head 231 is provided on the side wall of the rotating shaft. The connecting ball head 231 is clamped in the surface recess 274. When the unlocking knob 230 is rotated, the connecting ball head 231 generates an arc motion trajectory, thereby driving the sliding block 270 to compress the spring C271, so that the locking rod 272 at the end of the sliding block 270 is retracted into the rotating seat 200.

[0051] In order to make the footrest more stable when in use, there are two telescopic parts, which are symmetrically arranged around the rotation center of the unlocking knob. Two connecting ball heads 231 are symmetrically arranged on the outer wall of the unlocking knob 230, and the two connecting ball heads 231 are respectively connected to the sliding blocks 270 of the two telescopic parts.

[0052] like Fig.11 and Fig.12As shown, a limiting notch 251 is provided on the side wall of the rotating block 250, and the two ends of the support frame 210 are respectively fixed to the front ends of the two telescopic tubes 120. The telescopic tubes 120 are hollow tubular structures. A telescopic rod 170 is further provided in the telescopic tube 120. A limiting block 160 is fixed at one end of the telescopic rod 170. A spring B180 is further sleeved on the end of the telescopic rod 170. One end of the spring B180 abuts against the limiting block 160, and the other end abuts against the fixed block 121. The other end of the telescopic rod 170 extends out of the support frame 210 and / or the footrest 220 and then inserts into the limiting notch 251. An elongated through hole is further provided at one end of the telescopic tube 120 close to the fixed block 110, and the limiting block 160 passes through the elongated through hole. Figure 5 and Figure 6 shown.

[0053] The rotating seat 200 and the footrest 220 in this embodiment are integrally formed, the lock holes on the end faces at both ends of the length direction of the support frame 210 are flip lock holes A212, buckle covers 211 are also provided at both ends of the support frame 210, and a flip lock hole B214 is also provided in the width direction of the support frame 210. After the telescopic rod 170 extends out of the flip lock hole B214, it is inserted into the limiting notch 251 of the rotating block 250 on the rotating seat 200.

[0054] By pressing the toggle wrench 150, the telescopic tube 120 is extended under the action of the gas rod 130, and the limit block 160 moves forward together with the telescopic tube 120 until the limit block 160 abuts against the fixing frame 110. The telescopic tube 120 will continue to extend forward, so that the limit block 160 compresses the spring B180, and then the telescopic rod 170 retreats relative to the telescopic tube 120 until it exits the limit notch 251. The footrest 220 is flipped to the working state under the action of the torsion spring 260. After it is in place, the locking rod 272 is inserted into the locking hole under the action of the spring C271, so that the footrest 220 remains in the working state.

[0055] When retracting the footrest 220, turn the unlocking knob 230 to make the locking rod 272 withdraw from the flip lock hole A212, and then manually flip the footrest 220 to the storage position. At the same time, retract the telescopic tube 120 so that the telescopic rod 170 can be inserted into the limiting notch 251 again, locking the footrest 220 in the storage position. After the telescopic tube 120 is retracted into place, turn the wrench 150 to lock it in the retracted position.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. Footrest retractable mechanism, characterized in that: The invention comprises a fixed frame (110) and a telescopic tube (120), wherein the telescopic tube (120) is slidably arranged on the fixed frame (110), and a driving member is also provided on the fixed frame (110), wherein the driving member directly or indirectly drives the telescopic tube (120) to move in the fixed frame (110), and a toggle wrench (150) for limiting the position of the telescopic tube (120) is also provided on the fixed frame (110).

2. The footrest retractable mechanism according to claim 1, characterized in that: The movable end of the driving member is connected to the telescopic tube (120) to drive the telescopic tube (120) to move.

3. The footrest extension mechanism according to claim 1, characterized in that: The telescopic tube (120) is located at the end of the fixing frame (110), the driving member is arranged along the length direction of the fixing frame (110), and the movable end of the driving member drives the telescopic tube (120) to move via a pull rope (140).

4. The footrest extension mechanism according to claim 3, characterized in that: The driving member is a gas rod (130), an electric push rod or a spring, the fixed end of the gas rod (130), the electric push rod or the spring is close to the telescopic tube (120), one end of the telescopic tube (120) is also fixed with a fixed block (121), one side of the gas rod (130), the electric push rod or the spring is also provided with a guide wheel (112), one end of the pull rope (140) is clamped on the fixed block (121), the other end of the pull rope (140) is passed around the guide wheel (112) and fixed to the movable end of the gas rod (130), the electric push rod or the spring, and when the gas rod (130), the electric push rod or the spring is extended, the telescopic tube (120) is driven to extend through the pull rope (140).

5. The footrest extension mechanism according to claim 3, characterized in that: The movable end of the gas rod (130), electric push rod or spring is also provided with a freely rotating roller (131); a pull rope fixing block (111) and a guide wheel (112) are respectively provided on both sides of the gas rod (130), electric push rod or spring on the fixing frame (110); one end of the telescopic tube (120) is also fixed with a fixing block (121); one end of the pull rope (140) is clamped on the fixing block (121); the other end of the pull rope (140) is clamped on the pull rope fixing block (111) after passing through the guide wheel (112) and the roller (131); when the gas rod (130), electric push rod or spring is extended, the pull rope (140) drives the telescopic tube (120) to extend.

6. The footrest extension mechanism according to claim 5, characterized in that: The upper end surface of the fixing frame (110) is provided with a groove, and the gas rod (130) or the spring is fixed in the groove. The side wall of the groove of the fixing frame (110) is also provided with a notch for the pull rope to pass through. The pull rope fixing block (111), the roller (131), the guide wheel (112) and the fixing block (121) are located in the same plane for clamping the pull rope (140).

7. The footrest extension mechanism according to claim 1, characterized in that: Both ends of the fixing frame (110) are provided with through holes, and two telescopic tubes (120) are respectively inserted into the two through holes. The lower end surface of the through hole on the fixing frame (110) is also provided with a through hole. A positioning block (122) is fixed to the front end of the bottom of the telescopic tube (120). The toggle wrench (150) is also provided with a limiting protrusion (154). The toggle wrench (150) is hinged to one end of the fixing frame (110), and a spring A (153) is provided between the toggle wrench (150) and the fixing frame (110). Under the action of the spring A (153), the toggle wrench (150) always rests on the bottom of the fixing frame (110), and the limiting protrusion (154) passes through the through hole and is fixed at the positioning block (122).

8. The footrest extension mechanism according to claim 1, characterized in that: Through holes are provided at both ends of the fixing frame (110), and two telescopic tubes (120) are respectively inserted into the two through holes. The upper and lower end surfaces of the through holes are also provided with pulleys (113) and supporting wheels, and the pulleys (113) and supporting wheels act on the upper and lower end surfaces of the telescopic tubes (120) respectively.

9. A footrest device, characterized in that: The footrest retractable mechanism according to any one of claims 1 to 8 is adopted.

10. A chair, characterized in that: The footrest device according to claim 9 is adopted.

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