A foot mechanism and a leisure sofa chair

Abstract

The application discloses a foot mechanism, comprising: a fixed rod for being installed to the bottom of the load surface of a chair seat; a telescopic rod set comprising a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod and a foot plate connecting seat, the first end of the first connecting rod and the first end of the second connecting rod are respectively hinged to the fixed rod, the first end of the third connecting rod and the first end of the fourth connecting rod are respectively hinged to the foot plate connecting seat, the second end of the first connecting rod is hinged to the second end of the third connecting rod, the second end of the second connecting rod is hinged between the two ends of the third connecting rod, and the second end of the fourth connecting rod is hinged between the two ends of the second connecting rod; a rotating rod, a power rod and a driving device, the driving device is configured to drive the rotating rod to rotate, the rotating rod pushes the power rod to drive the telescopic rod set to extend or contract. The foot mechanism occupies a small installation height space and has a high lifting height, and the overall comfort of a leisure sofa chair can be improved. The application further discloses a leisure sofa chair.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of furniture, in particular to a foot mechanism and a leisure sofa chair. BACKGROUND

[0002] With the development of social economy, functional sofa chairs have entered people's daily life more and more, and leisure sofa chairs with electrically-driven foot pedals have become very popular. Such functional sofa chairs include foot pedal extension devices and chair seat frames, and the top surface of the chair seat frame is provided with sponge and leather to form a seat surface. Through the series mechanical linkage of the components of the chair seat frame, the foot pedal, the seat surface and the backrest can be adjusted at different angles and positions to realize different conversions of the user's sitting posture, leisure posture and lying posture on the sofa.

[0003] The height of the seat surface of the finished leisure sofa chair has a standard height range according to human comfort and different height requirements. Due to the limitation of the mechanical structure, the height of the chair seat frame of the leisure sofa chair on the market is relatively high. The increase in the height of the chair seat frame will make the thickness of the sponge and leather on the seat surface thinner, resulting in a less comfortable sitting feeling when the user sits on the seat surface of the leisure sofa chair. At the same time, the thinner thickness of the sponge and leather will also limit the shape of the finished seat surface, making the leisure sofa chair less aesthetically pleasing.

[0004] The foot pedal extension devices of such leisure sofa chairs are realized through different mechanical structure designs, including the use of full-linkage structures and the use of guide rail plus linkage structures. However, the existing foot pedal extension devices face the following problems:

[0005] (1) For the full-linkage structure, the number of linkage components used is relatively large, and the linkage occupies a large height space below the chair seat frame during rotation. If the height of the chair seat frame is reduced, the linkage components will be scraped by the ground, causing damage to the mechanical device.

[0006] (2) For the guide rail plus linkage structure, when the foot pedal linkage part is extended outside the chair seat frame, the extended foot pedal plate has a smaller height than the top surface of the chair seat frame. This will cause the foot pedal plate to be lower than the seat surface of the leisure sofa chair after the sponge and leather are added to the chair seat frame, resulting in a less optimal lifting height and affecting the user's comfort. SUMMARY

[0007] In order to overcome at least one of the defects of the prior art described above, the present application provides a foot mechanism and a leisure sofa chair. The foot mechanism occupies a smaller space below the chair seat, which facilitates the reduction of the overall seat height of the leisure sofa chair, and has a higher lifting height, so that the foot pedal plate of the leisure sofa chair is better adapted to the height of the seat surface of the leisure sofa chair, thereby improving the overall comfort of the leisure sofa chair.

[0008] The technical scheme adopted by the present application to solve the problems is:

[0009] A foot mechanism, comprising:

[0010] A fixed rod for mounting to the bottom of the load-bearing surface of the seat;

[0011] A telescopic rod set comprising a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, and a foot plate connecting seat, the first end of the first connecting rod and the first end of the second connecting rod are respectively hinged to the fixed rod, the first end of the third connecting rod and the first end of the fourth connecting rod are respectively hinged to the foot plate connecting seat, the second end of the first connecting rod is hinged to the second end of the third connecting rod, the second end of the second connecting rod is hinged between the two ends of the third connecting rod, and the second end of the fourth connecting rod is hinged between the two ends of the second connecting rod;

[0012] A rotating rod rotatably connected to the fixed rod;

[0013] A power rod, the first end of the power rod is eccentrically hinged to the rotating rod, and the second end of the power rod is hinged to one of the connecting rods of the telescopic rod set;

[0014] A driving device configured to drive the rotating rod to rotate, the rotating rod pushing the power rod to drive the telescopic rod set to extend or retract.

[0015] Further, in the extended state of the telescopic rod set, the height difference between the upper surface of the foot plate connecting seat and the upper surface of the fixed rod in the vertical direction is greater than or equal to 140 mm.

[0016] Further, the distance between the first end hinge point of the second connecting rod and the second end hinge point of the second connecting rod is less than or equal to 153 mm, and the distance between the first end hinge point of the third connecting rod and the second end hinge point of the third connecting rod is greater than or equal to 280 mm.

[0017] Further, the hinge point of the second connecting rod and the fixed rod is the second hinge point, the hinge point of the third connecting rod and the first connecting rod is the third hinge point, the hinge point of the second connecting rod and the fourth connecting rod is the fourth hinge point, the hinge point of the second connecting rod and the third connecting rod is the fifth hinge point, and the hinge point of the third connecting rod and the foot plate connecting seat is the sixth hinge point.

[0018] In the second connecting rod, the fourth hinge point is located on one side of the line connecting the second hinge point and the fifth hinge point.

[0019] In the third connecting rod, the fifth hinge point is located on one side of the line connecting the sixth hinge point and the third hinge point.

[0020] Further, the fourth hinge point is located on one side of the line connecting the second hinge point and the fifth hinge point in the direction of extension of the telescopic rod set, and the fifth hinge point is located on one side of the line connecting the sixth hinge point and the third hinge point in the direction of extension of the telescopic rod set.

[0021] Further, the fixed rod comprises a horizontal segment, a lower bending segment and an upper lifting segment connected in sequence, the lower bending segment is bent downward relative to the horizontal segment in the vertical direction, the upper lifting segment is lifted upward relative to the lower bending segment, and the free end of the upper lifting segment is higher than the horizontal segment, the first end of the first connecting rod and the first end of the second connecting rod are hingedly connected to the free end of the upper lifting segment, and the rotating rod is hingedly connected to the lower bending segment.

[0022] Further, the lower bending segment is arc-shaped, the horizontal segment and the upper lifting segment are connected to two ends of the lower bending segment respectively, and the horizontal segment, the lower bending segment and the upper lifting segment are integrally formed.

[0023] Further, one end of the driving device is hingedly connected to the horizontal segment, the other end of the driving device is hingedly connected to the rotating rod through the first crank eccentrically, and the first crank extends in the radial direction of the rotating rod.

[0024] Further, the first end of the power rod is hingedly connected to the rotating rod through the second crank eccentrically, the second crank extends in the radial direction of the rotating rod, and the second end of the power rod is hingedly connected to the second connecting rod.

[0025] Based on the same concept, the application further discloses a leisure sofa chair, which comprises a seat, a footboard and the foot mechanism.

[0026] When the telescopic rod set of the foot mechanism is in the extended state, the height difference between the upper surface of the footboard and the load-bearing surface of the seat is 50mm-150mm in the vertical direction, and the distance between the load-bearing surface of the seat and the ground is less than or equal to 270mm.

[0027] In summary, the foot mechanism and the leisure sofa chair provided by the application have the following technical effects:

[0028] 1) The foot mechanism provided by the application, through the optimized combination of the telescopic rod set, makes there be no cross hinging between every two connecting rods, at this time, the first part of the third connecting rod, the fixed rod, the first connecting rod and the second connecting rod form a first quadrilateral connecting rod structure, a part of the second connecting rod, the second part of the third connecting rod, the fourth connecting rod and the footboard connecting seat form a second quadrilateral connecting rod structure, and the design of the rotating rod and the power rod, so that the foot mechanism uses fewer rod components and occupies less space below the load-bearing surface of the seat during the rotation of the telescopic rod set, thereby the overall seat height of the seat can be reduced to reserve more thickness space for the sponge cushion, improve the comfort of the seat surface, and when the telescopic rod set is extended, the footboard connecting seat drives the footboard to be lifted to a higher height, so that the footboard of the leisure sofa chair is better adapted to the height of the seat surface of the leisure sofa chair, and the leisure sofa chair has good comfort and high foot lifting height at the same time, thereby improving the overall comfort of the leisure sofa chair.

[0029] 2) The structure of the foot mechanism is compact, simple and novel, the overall volume is relatively small, and the use is universal, and the foot mechanism can be installed in different types of sofa chair seat frames;

[0030] 3) The overall strength of the fixed rod is high, the service life is long, and the swing track of the rotating rod, the pushing track of the power rod and the swing track of the driving device do not affect the installation height of the foot mechanism in the chair seat, only the activity track of the telescopic rod group needs to be considered when calculating the chair seat height occupied by the foot mechanism, so as to further reduce the overall seat height of the chair seat. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a three-dimensional structure diagram of the leisure sofa chair of the embodiment of the present application;

[0032] Figure 2 It is a side view diagram of the overall height of the chair seat and the height of the foot plate of the leisure sofa chair of the embodiment of the present application;

[0033] Figure 3 It is a three-dimensional diagram of the unfolded state of the foot mechanism of the embodiment of the present application;

[0034] Figure 4 It is a side sectional view of the unfolded state of the foot mechanism of the embodiment of the present application;

[0035] Figure 5 It is a side sectional view of the intermediate state of the foot mechanism of the embodiment of the present application;

[0036] Figure 6 It is a side sectional view of the retracted state of the foot mechanism of the embodiment of the present application.

[0037] Among them, the meaning of the reference signs is as follows:

[0038] 1, fixed rod; 11, horizontal section; 12, lower folding section; 13, upper lifting section; 2, telescopic rod group; 21, first connecting rod; 22, second connecting rod; 23, third connecting rod; 24, fourth connecting rod; 25, foot plate connecting seat; 201, first hinge point; 202, second hinge point; 203, third hinge point; 204, fourth hinge point; 205, fifth hinge point; 206, sixth hinge point; 207, seventh hinge point; 208, eighth hinge point; 3, rotating rod; 301, rotating axis; 31, first crank; 32, second crank; 4, power rod; 5, driving device; 6, chair seat; 7, foot plate. DETAILED DESCRIPTION

[0039] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application.

[0040] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of 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 limiting the present application.

[0041] 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. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0042] Referring to Figure 1 and Figure 2 , the present application discloses a leisure sofa chair, which comprises a footrest mechanism, a seat 6 and a footboard 7, the load-bearing surface of the seat 6 can be added with sponge and leather to form the seat surface of the leisure sofa chair, the footrest mechanism is installed at the bottom of the load-bearing surface of the seat 6, the footboard 7 is installed at the extended end of the footrest mechanism, the footboard 7 can be lifted up when the footrest mechanism is extended, and the footboard 7 can be retracted and attached to the front side of the seat 6 or the bottom of the seat 6 when the footrest mechanism is retracted.

[0043] Of course, in other preferred embodiments, the footrest mechanism can also be installed on a multi-seat sofa chair or other types of leisure chairs.

[0044] Referring to Figure 3 and Figure 4 , in the present embodiment, the footrest mechanism comprises two fixed rods 1, two telescopic rod groups 2, a rotating rod 3, two power rods 4 and a driving device 5. Among them, the fixed rod 1 serves as a carrier, the two fixed rods 1 are oppositely installed on the bottom of the load-bearing surface of the seat 6 to realize the installation of the footrest mechanism on the seat 6; the telescopic rod group 2 serves as an output, the two telescopic rod groups 2 are respectively hinged to different fixed rods 1, the footboard 7 is installed at the output end of the two telescopic rod groups 2, the telescopic rod group 2 drives the footboard 7 to lift up when it is extended, and the telescopic rod group 2 drives the footboard 7 to retract when it is retracted; the rotating rod 3 and the power rod 4 constitute a transmission assembly of the footrest mechanism, the driving device 5 serves as a power source, the rotating rod 3 is rotationally connected between the two fixed rods 1, the first end of each power rod 4 is eccentrically hinged to the rotating rod 3, the second end of each power rod 4 is hinged to one of the links of the different telescopic rod groups 2, the driving device 5 is configured to drive the rotating rod 3 to rotate, the rotating rod 3 pushes the power rod 4 to drive the telescopic rod group 2 to extend or retract, specifically, the driving device 5 is an electric push rod or a pneumatic cylinder, one end of the driving device 5 is hinged to one of the fixed rods 1, the other end of the driving device 5 is eccentrically hinged to the rotating rod 3.

[0045] Importantly, the telescopic rod set 2 comprises a first connecting rod 21, a second connecting rod 22, a third connecting rod 23, a fourth connecting rod 24 and a footboard connecting seat 25, the first end of the first connecting rod 21 and the first end of the second connecting rod 22 are respectively hinged to the fixed rod 1, the first end of the third connecting rod 23 and the first end of the fourth connecting rod 24 are respectively hinged to the footboard connecting seat 25, the second end of the first connecting rod 21 is hinged to the second end of the third connecting rod 23, the second end of the second connecting rod 22 is hinged between the two ends of the third connecting rod 23, and the second end of the fourth connecting rod 24 is hinged between the two ends of the second connecting rod 22.

[0046] Specifically, referring to Figure 3 and Figure 4 , the specific positions of each hinge point in the telescopic rod set 2 are as follows:

[0047] The hinge point between the first connecting rod 21 and the fixed rod 1 is the first hinge point 201, the hinge point between the second connecting rod 22 and the fixed rod 1 is the second hinge point 202, the hinge point between the first connecting rod 21 and the third connecting rod 23 is the third hinge point 203, the hinge point between the second connecting rod 22 and the fourth connecting rod 24 is the fourth hinge point 204, the hinge point between the second connecting rod 22 and the third connecting rod 23 is the fifth hinge point 205, the hinge point between the third connecting rod 23 and the footboard connecting seat 25 is the sixth hinge point 206, and the hinge point between the fourth connecting rod 24 and the footboard connecting seat 25 is the seventh hinge point 207.

[0048] Therefore, according to the above description, the specific positions of each hinge point on different connecting rods are as follows:

[0049] In the first connecting rod 21, the first hinge point 201 is located at the first end of the first connecting rod 1, and the third hinge point 203 is located at the second end of the first connecting rod 1.

[0050] In the second connecting rod 22, the second hinge point 202 is located at the first end of the second connecting rod 22, the fifth hinge point 205 is located at the second end of the second connecting rod 22, and the fourth hinge point 204 is located between the second hinge point 202 and the fifth hinge point 205.

[0051] In the third connecting rod 23, the sixth hinge point 206 is located at the first end of the third connecting rod 23, the third hinge point 203 is located at the second end of the third connecting rod 23, and the fifth hinge point 205 is located between the sixth hinge point 206 and the third hinge point 203.

[0052] In the fourth connecting rod 24, the seventh hinge point 207 is located at the first end of the fourth connecting rod 24, and the fourth hinge point 204 is located at the second end of the fourth connecting rod 24.

[0053] In addition, in the footrest connecting seat 25, the sixth hinge point 206 and the seventh hinge point 207 are respectively located at intervals on the footrest connecting seat 25.

[0054] In the above scheme, through the optimized combination of the telescopic rod group 2, there is no cross hinge between every two connecting rods (it should be noted that the cross hinge referred to in the scheme refers to the hinge points between two connecting rods being located at the non-end position of the two connecting rods, that is, in each connecting rod, there are still two other hinge points on both sides of the hinge point), at this time, the first part of the third connecting rod 23, the fixed rod 1, the first connecting rod 21 and the second connecting rod 22 form a first quadrilateral connecting rod structure, a part of the second connecting rod 22, the second part of the third connecting rod 23, the fourth connecting rod 24 and the footrest connecting seat form a second quadrilateral connecting rod structure, plus the design of the rotating rod 3 and the power rod 4, the number of rod components used by the footrest mechanism is less, and the space occupied by the telescopic rod group 2 below the load bearing surface of the seat 6 during rotation is smaller, thereby the overall seat height of the seat 6 can be reduced to reserve more thickness space for the sponge cushion, improve the sitting comfort of the seat surface, and when the telescopic rod group 2 is extended, the footrest connecting seat 25 drives the footrest 7 to be lifted to a higher height, so that the footrest of the leisure sofa chair is better adapted to the seat surface height of the leisure sofa chair, thereby the leisure sofa chair has good sitting feeling and high foot lifting height at the same time, thereby improving the overall comfort of the leisure sofa chair.

[0055] In particular, referring to Figure 4 In the extended state of the telescopic rod group 2, the height difference C between the upper surface of the footrest connecting seat 25 and the upper surface of the fixed rod 1 in the vertical direction is greater than or equal to 140 mm, and preferably the height difference C is 150 mm.

[0056] Referring to Figure 5 The distance D between the first end hinge point (i.e. the second hinge point 202) of the second connecting rod 22 and the second end hinge point (i.e. the fifth hinge point 205) of the second connecting rod 22 is less than or equal to 153 mm, and preferably the distance is 140 mm.

[0057] The distance E between the first end hinge point (i.e. the sixth hinge point 206) of the third connecting rod 23 and the second end hinge point (i.e. the third hinge point 203) of the third connecting rod 23 is greater than or equal to 280 mm, and preferably the distance is 300 mm.

[0058] In addition, the overall length of the second connecting rod 22 is greater than the overall length of the first connecting rod 21; and the overall length of the third connecting rod 23 is greater than the overall length of the fourth connecting rod 24.

[0059] Through the physical proofing verification, referring to Figure 2, the overall height A of the seat 6 (i.e. the distance between the load bearing surface of the seat 6 and the ground) can be reduced to 270mm or less, preferably, the height A is 260mm to 240mm; the height difference B between the support surface of the seat 6 and the footboard 7 after the footboard 7 is lifted can be 50mm to 150mm, preferably, the height difference B is 130mm to 150mm, so as to ensure the overall comfort of the leisure sofa chair. Of course, the above parameters can be adjusted within the relevant range as needed.

[0060] Referring to Figure 4 In the embodiment, preferably, in the second connecting rod 22, the fourth hinge point 204 is located on one side of the line connecting the second hinge point 202 and the fifth hinge point 205, in particular, the fourth hinge point 204 is located on the side of the line connecting the second hinge point 202 and the fifth hinge point 205 facing the extension direction of the telescopic rod set 2.

[0061] Referring to Figure 4 In the embodiment, preferably, in the third connecting rod 23, the fifth hinge point 205 is located on one side of the line connecting the sixth hinge point 206 and the third hinge point 203, in particular, the fifth hinge point 205 is located on the side of the line connecting the sixth hinge point 206 and the third hinge point 203 facing the extension direction of the telescopic rod set 2.

[0062] In addition, when the footboard mechanism is in the extended state, the second connecting rod 22 is located on the side of the first connecting rod 21 facing the footboard connecting seat 25, and the second connecting rod 22 and the fourth connecting rod 24 are both located on the inner side of the included angle formed by the first connecting rod 21 and the third connecting rod 23.

[0063] Through the position deviation of each hinge point and the relative position of each connecting rod, the structure of the footboard mechanism is compact, simple and novel, the overall volume is relatively small, and the use is universal, so that it can be matched to different types of sofa chair seat frames.

[0064] Referring to Figure 3 and Figure 4 In the embodiment, in order to realize the eccentric hinge of the driving device 5 on the rotating rod 3, a first crank 31 is arranged on the rotating rod 3, the first crank 31 extends along the radial direction of the rotating rod, and the output end of the driving device 5 is hinged to the first crank 31.

[0065] Similarly, in order to realize the eccentric hinge of the power rod 4 on the rotating rod 3, a second crank 32 is arranged on the rotating rod 3, the second crank 32 extends along the radial direction of the rotating rod, and the first end of the power rod 4 is hinged to the second crank 32.

[0066] In addition, the second end of the power rod 4 is hingedly connected to the second connecting rod 22. Specifically, the hingedly connected point of the power rod 4 to the second connecting rod 22 is the eighth hingedly connected point 208; in the second connecting rod 22, the eighth hingedly connected point 208 is located between the second hingedly connected point 202 and the fourth hingedly connected point 204.

[0067] In this way, the linear thrust of the driving device 5 can be better utilized to drive the telescopic rod set 2 to rotate and extend or contract.

[0068] Of course, in other preferable embodiments, the second end of the power rod 4 can also be hingedly connected to the first connecting rod 21, which can also drive the telescopic rod set 2 to rotate.

[0069] Referring to Figure 3 and Figure 4 In the present embodiment, preferably, the fixed rod 1 comprises a horizontal section 11, a lower bent section 12 and an upper lifting section 13 connected in sequence, in the vertical direction, the lower bent section 12 is bent downward relative to the horizontal section 11, the upper lifting section 13 is lifted upward relative to the lower bent section 12, and the free end of the upper lifting section 13 is higher than the horizontal section 11, the first end of the first connecting rod 21 and the first end of the second connecting rod 22 are hingedly connected to the free end of the upper lifting section 13, the rotating rod 3 is rotationally connected to the lower bent section 12, and the driving device 5 is hingedly connected to the horizontal section 11. That is, the first hingedly connected point 21 and the second hingedly connected point 22 are located at the free end of the upper lifting section 13, the rotation axis 301 of the rotating rod 3 is located at the lower bent section 12, and the hingedly connected point of the driving device 5 is located at the horizontal section 11.

[0070] Specifically, the lower bent section 12 is arc-shaped, the horizontal section 11 and the upper lifting section 13 are respectively connected to the two ends of the lower bent section 12, and the horizontal section 11, the lower bent section 12 and the upper lifting section 13 are integrally formed, thereby ensuring the overall strength of the fixed rod 1.

[0071] In the above scheme related to the fixed rod 1, the user's foot is placed on the foot plate 7, the load thereof is transmitted to the free end of the upper lifting section 13 through the telescopic rod set 2 and is dispersed to the lower bent section 12, which can well absorb and digest the load, thereby improving the service life of the fixed rod 1.

[0072] On the other hand, the first and second hinge points 21 and 22 are both formed with a large height difference with the rotation axis 301, which can provide a large activity space for the swing of the rotation rod 3 and the push of the power rod 4, and the swing track of the rotation rod 3 and the push track of the power rod 4 will not affect the installation height of the footrest mechanism in the seat 6; similarly, the first and second hinge points 21 and 22 are both formed with a small height difference with the hinge point of the driving device 5 on the fixed rod 1, and in cooperation with the arrangement of the first crank 31, the swing range of the driving device 5 in the telescopic process is basically maintained in a small range of up and down fluctuation in the horizontal plane, and the swing track of the driving device 5 will also not affect the installation height of the footrest mechanism in the seat 6. Therefore, when calculating the height space of the seat 6 occupied by the footrest mechanism, only the activity track of the telescopic rod group 2 needs to be considered, so as to further reduce the overall seat height of the seat 6.

[0073] Referring to Figures 4 to 6 , the action process of the footrest mechanism provided by the present application is as follows:

[0074] (1) Taking the retracted state shown in Figure 6 as the initial state, in the initial state, the driving device 5 is elongated, the rotation rod 3 is rotated counterclockwise by the first crank 31, the power rod 4 is moved to the left by the second crank 32, the power rod 4 pushes the second connecting rod 22 to rotate clockwise, so that the telescopic rod group 2 is extended and lifted, and after passing through the intermediate state shown in Figure 5 , the extended state shown in Figure 4 is entered;

[0075] (2) The driving device 5 is retracted, the rotation rod 3 is rotated clockwise by the first crank 31, the power rod 4 is moved to the right by the second crank 32, the power rod 4 pushes the second connecting rod 22 to rotate counterclockwise, so that the telescopic rod group 2 is retracted, and after passing through the intermediate state shown in Figure 5 , the retracted state shown in Figure 6 is returned to.

[0076] The technical means disclosed in the present application scheme is not limited to the technical means disclosed in the above-mentioned embodiments, but also includes the technical solutions composed of any combination of the above technical features. It should be pointed out that, for ordinary skilled in the art, without departing from the principle of the present application, a number of improvements and refinements can be made, which are also considered as the protection scope of the present application.

Claims

1. A foot pedal mechanism, characterized in that, include: A fixing rod is used to install the chair seat onto the bottom of its load-bearing surface. A telescopic rod assembly includes a first link, a second link, a third link, a fourth link, and a footplate connecting seat. The first end of the first link and the first end of the second link are respectively hinged to the fixed rod. The first end of the third link and the first end of the fourth link are respectively hinged to the footplate connecting seat. The second end of the first link is hinged to the second end of the third link. The second end of the second link is hinged between the two ends of the third link. The second end of the fourth link is hinged between the two ends of the second link. A rotating rod is rotatably connected to the fixed rod; A power rod, the first end of which is eccentrically hinged to the rotating rod, and the second end of which is hinged to one of the connecting rods of the telescopic rod assembly; A drive device is configured to drive the rotating rod to rotate, and the rotating rod pushes the power rod to extend or retract the telescopic rod assembly; The fixed rod includes a horizontal section, a lower fold section, and an upper lifting section connected in sequence. In the vertical direction, the lower fold section bends downward relative to the horizontal section, and the upper lifting section is raised upward relative to the lower fold section. The free end of the upper lifting section is higher than the horizontal section. The first end of the first connecting rod and the first end of the second connecting rod are respectively hinged to the free end of the upper lifting section. The rotating rod is rotatably connected to the lower fold section. The hinge point between the second link and the fixed link is the second hinge point; the hinge point between the third link and the first link is the third hinge point; the hinge point between the second link and the fourth link is the fourth hinge point; the hinge point between the second link and the third link is the fifth hinge point; and the hinge point between the third link and the footplate connector is the sixth hinge point. In the second link, the fourth hinge point is located on one side of the line connecting the second and fifth hinge points; in the third link, the fifth hinge point is located on one side of the line connecting the sixth and third hinge points.

2. The foot pedal mechanism according to claim 1, characterized in that, When the telescopic rod assembly is extended, the height difference between the upper surface of the footplate connecting seat and the upper surface of the fixed rod in the vertical direction is greater than or equal to 140mm.

3. The foot pedal mechanism according to claim 1, characterized in that, The distance between the first hinge point and the second hinge point of the second connecting rod is less than or equal to 153 mm, and the distance between the first hinge point and the second hinge point of the third connecting rod is greater than or equal to 280 mm.

4. The foot pedal mechanism according to claim 1, characterized in that, The fourth hinge point is located on the side of the line connecting the second and fifth hinge points toward the extension direction of the telescopic rod assembly, and the fifth hinge point is located on the side of the line connecting the sixth and third hinge points toward the extension direction of the telescopic rod assembly.

5. The foot pedal mechanism according to claim 1, characterized in that, The lower fold section is arc-shaped, and the horizontal section and the upper section are respectively connected to the two ends of the lower fold section, and the horizontal section, the lower fold section and the upper section are integrally formed.

6. The foot pedal mechanism according to claim 1, characterized in that, One end of the drive device is hinged to the horizontal section, and the other end of the drive device is hinged eccentrically to the rotating rod via a first crank, the first crank extending radially along the rotating rod.

7. The foot pedal mechanism according to claim 1, characterized in that, The first end of the power rod is eccentrically hinged to the rotating rod via a second crank that extends radially along the rotating rod, and the second end of the power rod is hinged to the second connecting rod.

8. A casual sofa chair, characterized in that, The chair includes a seat, a footrest, and a footrest mechanism as described in any one of claims 1 to 7, wherein the footrest mechanism is mounted on the bottom of the bearing surface of the seat, and the footrest is mounted on the footrest connecting seat of the footrest mechanism; When the telescopic rod assembly of the footrest mechanism is extended, the height difference between the upper surface of the footrest and the bearing surface of the seat is 50mm to 150mm in the vertical direction, and the distance between the bearing surface of the seat and the ground is less than or equal to 270mm.

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