Footrest telescopic mechanism, footrest device and chair thereof

Abstract

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

Description

TECHNICAL FIELD

[0001] The utility model belongs to furniture technical field, especially relate to a foot rest plate telescopic mechanism, foot rest plate device and chair thereof. BACKGROUND

[0002] Leisure chair is one of the furniture that is necessary for home office, people in long time rest and relax time, most of the time is sitting on the chair office, long time sitting is easy to cause body fatigue, so people often lie on the chair rest, but when lying on the chair, people's feet do not have suitable place to place, so that people lie on the chair is not very comfortable. So more and more seats are designed with a seat foot rest, seat foot rest can make the leg stretch flat, play the role of promoting blood circulation.

[0003] At present, the seat with foot rest on the market has two structures: one is to set up the foot rest plate of pull type, and the foot rest can be pulled forward and backward to use or hide;The other is to set up the foot rest plate of turnover type, and the foot rest plate is turned over to make the foot rest plate exist two use states of turning over opening or folding in the bottom end of the seat.

[0004] At present, the seat with foot rest structure needs to be manually operated by the user, and the operation is complicated, and cannot meet the requirement of quick folding of the foot rest plate. UTILITY MODEL CONTENTS

[0005] In order to solve the above technical problems, the first purpose of the utility model is to provide a foot rest plate telescopic mechanism, which can realize the function of automatic extension of the foot rest plate;The second purpose of the utility model is to provide a foot rest plate device, and the second purpose of the utility model is to provide a chair.

[0006] In order to realize the first purpose of the utility model, the utility model adopts the following technical scheme:

[0007] The foot rest plate telescopic mechanism comprises a fixed frame and a telescopic pipe, the telescopic pipe is slidably arranged on the fixed frame, the fixed frame is further provided with a driving part, the driving part directly or indirectly drives the telescopic pipe to move in the fixed frame, and the fixed frame is further provided with a turning wrench for limiting the position of the telescopic pipe.

[0008] As a preferred scheme, the movable end of the driving part is connected with the telescopic pipe to drive the telescopic pipe to move.

[0009] As a preferred scheme, the telescopic pipe is located at the end of the fixed frame, the driving part is arranged along the length direction of the fixed frame, and the movable end of the driving part drives the telescopic pipe to move through a pull rope.

[0010] As a preferred scheme: the driving member is a gas rod, an electric push rod or a spring, a fixed end of the gas rod, the electric push rod or the spring is close to the telescopic pipe, one end of the telescopic pipe is further fixed with a fixed block, one side of the gas rod, the electric push rod or the spring is further provided with a guide wheel, one end of the pull rope is clamped on the fixed block, the other end of the pull rope is fixed on a movable end of the gas rod, the electric push rod or the spring through the guide wheel, and the gas rod, the electric push rod or the spring is extended to drive the telescopic pipe to extend through the pull rope.

[0011] As a preferred scheme: the movable end of the gas rod, the electric push rod or the spring is further provided with a freely rotating roller, the fixed frame is provided with a pull rope fixed block and a guide wheel on both sides of the gas rod, the electric push rod or the spring, one end of the telescopic pipe is further fixed with a fixed block, one end of the pull rope is clamped on the fixed block, the other end of the pull rope is clamped on the pull rope fixed block after passing through the guide wheel and the roller, and the gas rod, the electric push rod or the spring is extended to drive the telescopic pipe to extend through the pull rope.

[0012] As a preferred scheme: the upper end face of the fixed frame is provided with a recess, the gas rod or the spring is fixed in the recess, a notch for the pull rope to pass through is further formed in the side wall of the recess of the fixed frame, and the pull rope fixed block, the roller, the guide wheel and the clamping position of the fixed block for clamping the pull rope are located in the same plane.

[0013] As a preferred scheme: both ends of the fixed frame are provided with through holes, two telescopic pipes are respectively inserted into the two through holes, the lower end face of the through hole of the fixed frame is further provided with a through hole, the bottom front end of the telescopic pipe is fixed with a positioning block, a limiting protrusion is further arranged on the turning wrench, the turning wrench is hinged to one end of the fixed frame, a spring A is arranged between the turning wrench and the fixed frame, under the action of the spring A, the turning wrench is always abutted against the bottom of the fixed frame, and the limiting protrusion is clamped at the positioning block through the through hole.

[0014] As a preferred scheme: both ends of the fixed frame are provided with through holes, two telescopic pipes are respectively inserted into the two through holes, the upper and lower end faces of the through hole are further provided with a pulley and a supporting wheel, and the pulley and the supporting wheel act on the upper and lower end faces of the telescopic pipe.

[0015] In order to realize the second purpose of the utility model, the utility model adopts the following technical scheme:

[0016] The footrest device adopts the footrest telescopic mechanism in any one of the above.

[0017] In order to realize the third purpose of the utility model, the utility model adopts the following technical scheme:

[0018] The chair is characterized in that the footrest device is used.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] The telescopic pipe in the foot rest plate telescopic mechanism is driven to move in the fixing frame by the driving part, and the position of the telescopic pipe is fixed by the turning wrench, only need to pull the turning wrench when operating, and the telescopic pipe can be made to stretch forward under the driving of the driving part, the operation convenience is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings accompanying the specification provide further understanding of the present application, the illustrative embodiments thereof, and explanations for the present application, and do not constitute limitations to the present application.

[0022] Figure 1 And Figure 2 The utility model discloses a foot rest plate device is in two different angle under the structure schematic drawing of folding state of gathering up of the utility model,

[0023] Figure 3 And Figure 4 The utility model discloses a foot rest plate device is in two different angle under the structure schematic drawing of unfolding state of stretching of the utility model,

[0024] Figure 5 And Figure 6 The utility model discloses a foot rest plate telescopic mechanism's two different angle under the structure schematic drawing,

[0025] Figure 7 、 Figure 8 And Figure 9 The utility model discloses a foot rest plate turnover mechanism's three different angle under the structure schematic drawing,

[0026] Figure 10 The utility model discloses a foot rest plate turnover mechanism's three different angle under the structure schematic drawing,

[0027] Figure 11 The utility model discloses a foot rest plate device is in the cross section structure schematic drawing under folding state of gathering up of the utility model,

[0028] Figure 12 The utility model discloses a foot rest plate device is in the cross section structure schematic drawing under unfolding state of stretching of the utility model.

[0029] The reference signs are: 110, fixed frame; 111, pull rope fixing block; 112, guide wheel; 113, pulley; 114, support wheel A; 115, support wheel B; 120, telescopic pipe; 121, fixing block; 122, positioning block; 130, air rod; 131, roller; 140, pull rope; 150, push wrench; 151, support shaft; 152, buckling plate; 153, spring A; 154, limiting protrusion; 160, limiting block; 170, telescopic rod; 180, spring B; 200, rotating seat; 201, containing cavity; 202 connecting column; 210, support frame; 211, buckling cover; 212, turnover lock hole A; 213, torsional spring socket; 214, turnover lock hole B; 220, foot plate; 221, limiting port; 230, unlocking knob; 231, connecting ball head; 240, bottom plate; 241, support column; 250, rotating block; 251, limiting gap; 260, torsional spring; 270, sliding block; 271, spring C; 272, lock rod; 273, connecting strip; 274, spherical recess; 280, bearing; 290, locking screw. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed description is illustrative only, and is intended to provide further description in order to provide a fuller enabling teaching of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0031] It is also important to note that the terms "including", "containing" and / or "comprising", when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or groups thereof.

[0032] In addition, in the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The present invention will be further described below with reference to 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. The footrest flipping mechanism is located at the front end of the footrest telescopic mechanism. The footrest telescopic mechanism includes a fixed frame 110 and a telescopic tube 120. The telescopic tube 120 is slidably mounted on the fixed frame 110. The fixed frame 110 is also provided with a driving component. The driving component directly or indirectly drives the telescopic tube 120 to move within the fixed frame 110. 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 whole footrest telescopic mechanism movement more stable, the fixed frame 110 and the telescopic tube 120 are arranged perpendicularly to each other, both ends of the fixed frame 110 are provided with through holes, and the two telescopic tubes 120 are respectively inserted into the two through holes. The upper and lower end faces of the through holes are further provided with pulleys 113 and supporting wheels. The supporting wheels in contact with the lower end faces of the two telescopic tubes 120 are respectively supporting wheel A 114 and supporting wheel B 115. The pulleys 113 and the supporting wheels act on the upper and lower end faces of the telescopic tube 120 respectively, so that the telescopic tube 120 moves more smoothly in the fixed frame 110. The two telescopic tubes 120 are connected to each other. In the embodiment, the two telescopic tubes 120 are connected together through the footrest turnover mechanism.

[0039] The upper end face of the fixed frame 110 is provided with a recess, and the driving device is fixed in the recess. The driving device moves the telescopic tube 120 through the pull rope 140. The driving device is a gas rod 130. 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. One end of the telescopic tube 120 is further fixed with a fixed block 121. One side of the gas rod 130 is further 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 wound around the guide wheel 112 and fixed on the movable end of the gas rod 130.

[0040] In order to make the pull rope 140 move more smoothly, the movable end of the gas rod 130 is further provided with a freely rotating roller 131. The fixed frame 110 is further provided with a pull rope fixing block 111 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 fixed block 121. The other end of the pull rope 140 is clamped on the pull rope fixing block 111 after being wound around the guide wheel 112 and the roller 131. When the gas rod 130 is extended, the telescopic tube is extended through the pull rope.

[0041] As a further preferred scheme, the recess side wall of the fixed frame 110 is further 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 fixed block 121 are located in the same plane.

[0042] The lower end face of the through hole of the fixed frame 110 is further provided with a through hole. The bottom front end of the telescopic tube 120 is fixed with a positioning block 122. The turning wrench 150 is further provided with a limiting protrusion 154. The turning wrench 150 is hinged to one end of the fixed frame 110, and a spring A 153 is arranged between the turning wrench 150 and the fixed frame 110. Under the action of the spring A 153, the turning wrench 150 always abuts against the bottom of the fixed frame 110, and the limiting protrusion 154 passes through the through hole and is clamped on the positioning block 122.

[0043] The toggle wrench 150 is provided with a supporting shaft 151, one end of the fixing frame 110 is provided with a clamping groove, the supporting shaft 151 is embedded in the clamping groove, the bottom of the fixing frame 110 is further provided with a buckle plate 152, the buckle plate 152 encloses 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, the toggle wrench 150 is rotated downward, the limiting protrusion 154 is separated from the positioning block 122, and the telescopic pipe 120 is stretched forward under the action of the air rod 130 and the pull rope 140; when the telescopic pipe 120 is retracted, the telescopic pipe 120 is manually pushed backward until the positioning block 122 on the telescopic pipe 120 is clamped into the limiting protrusion 154 of the toggle wrench 150.

[0045] When the telescopic pipe 120 is retracted, the cooperation surface of the positioning block 122 and the limiting protrusion 154 is a slope. In addition, in order to make the stretching position of the telescopic pipe 120 adjustable, a plurality of positioning blocks 122 can be arranged at certain distances at the bottom of the telescopic pipe 120.

[0046] In other embodiments, the driving device can adopt a spring, which can directly replace the air rod in the footrest telescopic mechanism or can be arranged in parallel with the telescopic pipe to directly drive the telescopic pipe to stretch out. Of course, the air rod in the embodiment can also adopt a structure arranged in parallel with the telescopic pipe. In other embodiments, the driving device can also adopt a forward and reverse motor, and cooperate with a gear and a rack or a lead screw and a nut and the like transmission form. At this time, the toggle switch can be the switch of the forward and reverse motor.

[0047] As shown in Figures 7 to 9 The footrest turnover mechanism includes a supporting frame 210 and a footrest 220 rotatably connected with each other, and a rotation limiting mechanism is arranged therebetween. The footrest 220 can be turned over to a use state position and a storage state position relative to the supporting frame 210 through the rotation limiting mechanism. The rotation limiting mechanism includes a rotating seat 200, the rotating seat 200 is provided with an accommodating cavity 201, the accommodating cavity 201 is further covered with a bottom plate 240, a telescopic piece is arranged in the accommodating cavity 201, the rotating seat 200 is further provided with an unlocking knob 230, one end of the telescopic piece is connected with the unlocking knob 230, and the other end of the telescopic piece is pulled out from the rotating seat 200 under the action of an elastic assembly. The rotation limiting mechanism is fixed on one of the supporting frame 210 and the footrest 220, and the other one is provided with a corresponding lock hole. When the footrest 220 is turned over to the use state position, the telescopic piece is inserted into the lock hole.

[0048] Two ends of the rotating seat 200 are respectively fixed with rotating blocks 250, the rotating blocks 250 are fixed at the end of the rotating seat through locking screws 290, a bearing 280 is sleeved on the rotating block 250, outer rings of the bearing 280 are embedded and fixed at two ends of the support frame 210 or the foot plate 220, a torsional spring 260 is also sleeved on the rotating block 250, the support frame 210 or the foot plate 220 is also provided with a torsional spring socket 213, the end of the rotating seat is also provided with a limiting port 221, two torsional arms of the torsional spring 260 are respectively clamped in the torsional spring socket 213 and the limiting port 221.

[0049] As shown in Figure 10 , the telescopic part includes a sliding block 270 and a locking rod 272, the sliding block 270 is a frame structure, as a whole, two rectangular frames are connected together, the locking rod 272 is fixed at one end of the sliding block 270, the bottom plate 240 and the rotating seat 200 are fixed through screws, the accommodating cavity 201 of the rotating seat is also provided with a connecting column 202 matched with the screw, the connecting column 202 is a threaded column, one of the rectangular frames of the sliding block 270 is sleeved on the threaded column, the elastic assembly is a spring C 271, two ends of the spring C 271 are respectively abutted with the threaded column and the side wall of the rectangular frame, the spring C 271 makes the locking rod 272 pass through the rotating seat 200.

[0050] The other end of the sliding block 270 is integrally formed with a connecting strip 273, the connecting strip 273 is provided with a spherical notch 274, the unlocking knob 230 includes an integrally formed hand holding part and a rotating shaft, the hand holding part is located on the end face of the rotating shaft seat, facilitating operation, the rotating shaft is located in the accommodating cavity 201, the bottom plate 240 is provided with a supporting column 241, the rotating shaft is sleeved on the supporting column 241 and is arranged in opposite rotation with the supporting column 241, the side wall of the rotating shaft is provided with a connecting ball head 231, the connecting ball head 231 is clamped in the spherical notch 274, the unlocking knob 230 is rotated, the connecting ball head 231 generates an arc-shaped motion track, and in turn drives the sliding block 270 to compress the spring C 271, 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 foot plate more stable when in use, the telescopic part is two, and is centrally symmetrically arranged around the rotating 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 with the sliding blocks 270 of the two telescopic parts.

[0052] As shown in Figure 11 and Figure 12As shown, the side wall of the rotating block 250 is provided with a limiting gap 251, the two ends of the support frame 210 are respectively fixed at the front ends of the two telescopic tubes 120, the telescopic tube 120 is a hollow tubular structure, the telescopic tube 120 is further provided with a telescopic rod 170, one end of the telescopic rod 170 is fixed with a limiting block 160, the end of the telescopic rod 170 is further sleeved with a spring B180, 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 is inserted into the limiting gap 251, the end of the telescopic tube 120 close to the fixed block 110 is further provided with a long strip-shaped through hole, the limiting block 160 passes through the long strip-shaped through hole, and the telescopic tube 120 is provided with a telescopic rod 170. Figure 5 and Figure 6 As shown.

[0053] The rotating seat 200 in the embodiment is integrally formed with the footrest 220, the lock hole on the end face of the length direction of the two ends of the support frame 210 is a flip lock hole A212, the two ends of the support frame 210 are further provided with a buckle cover 211, the support frame 210 is further provided with a flip lock hole B214 in the width direction, and the telescopic rod 170 extends out of the flip lock hole B214 and is inserted into the limiting gap 251 of the rotating block 250 on the rotating seat 200.

[0054] After the telescopic tube 120 extends out under the action of the air rod 130, the limiting block 160 moves forward together with the telescopic tube 120, until the limiting block 160 abuts against the fixed frame 110, the telescopic tube 120 continues to extend forward, so that the limiting block 160 compresses the spring B180, and then the telescopic rod 170 retreats relative to the telescopic tube 120, until it exits the limiting gap 251, the footrest 220 is flipped to the working state under the action of the torsional spring 260, after being in place, the lock rod 272 is inserted into the lock hole under the action of the spring C271, so that the footrest 220 remains in the working state.

[0055] When the footrest 220 is retracted, the unlocking knob 230 is rotated, so that the lock rod 272 exits the flip lock hole A212, and then the footrest 220 is manually flipped to the storage position, and the telescopic tube 120 is retracted, so that the telescopic rod 170 can be clamped into the limiting gap 251 again, and the footrest 220 is locked in the storage position, and after the telescopic tube 120 retreats to the position, the knob 150 is locked in the retracted position.

[0056] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary, and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application without departing from the principles and spirits of the present application. Any simple modification, equivalent change and modification made according to the technical essence of the present application to the above-described embodiments still belong to the scope of the technical scheme of the present application.

Claims

1. A footrest telescopic mechanism, characterized in that: It includes a fixed frame (110) and a telescopic tube (120). The telescopic tube (120) is slidably mounted on the fixed frame (110). The fixed frame (110) is also provided with a driving component, which directly or indirectly drives the telescopic tube (120) to move within the fixed frame (110). The fixed frame (110) is also provided with a toggle wrench (150) for limiting the position of the telescopic tube (120). The telescopic tube (120) is located at the end of the fixed frame (110), and the driving component is arranged along the length of the fixed frame (110). The movable end of the driving component drives the telescopic tube (120) to move through the pull rope (140). The driving component is a pneumatic rod (130), an electric push rod, or a spring. The fixed end of the pneumatic rod (130), electric push rod, or spring is close to the telescopic tube (120). One end of the telescopic tube (120) is also fixed with a fixing block (121). A guide wheel (112) is also provided on one side of the pneumatic rod (130), electric push rod, or spring. One end of the pull rope (140) is locked on the fixing block (121), and the other end of the pull rope (140) passes around the guide wheel (112) and is fixed to the movable end of the pneumatic rod (130), electric push rod, or spring. When the pneumatic rod (130), electric push rod, or spring extends, the telescopic tube (120) extends through the pull rope (140).

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

3. The footrest telescopic mechanism according to claim 1, characterized in that: The movable end of the pneumatic rod (130), electric push rod, or spring is also provided with a freely rotating roller (131). The fixed frame (110) is provided with a rope fixing block (111) and a guide wheel (112) on both sides of the pneumatic rod (130), electric push rod, or spring. One end of the telescopic tube (120) is also fixed with a fixing block (121). One end of the rope (140) is locked on the fixing block (121), and the other end of the rope (140) passes around the guide wheel (112) and the roller (131) and is locked on the rope fixing block (111). When the pneumatic rod (130), electric push rod, or spring extends, the telescopic tube (120) is driven to extend through the rope (140).

4. The footrest telescopic mechanism according to claim 3, characterized in that: The upper end face of the fixing frame (110) is provided with a groove, and the gas rod (130) or 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 positions of the locking holes on the pull rope fixing block (111), roller (131), guide wheel (112) and fixing block (121) for locking the pull rope (140) are on the same plane.

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

6. The footrest telescopic mechanism according to claim 1, characterized in that: Both ends of the fixed frame (110) are provided with through holes, and two telescopic tubes (120) are respectively inserted into the two through holes. The upper and lower end faces of the through holes are also provided with pulleys (113) and support wheels, and the pulleys (113) and support wheels act on the upper and lower end faces of the telescopic tubes (120) respectively.

7. A footrest device, characterized in that: The footrest telescopic mechanism described in any one of claims 1 to 6 is adopted.

8. A chair, characterized in that: The footrest device described in claim 7 above is used.

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