Linked retractable footrest structure and seat

Abstract

The present invention discloses a coordinated retractable footrest structure and a seat. The coordinated retractable footrest structure includes a footrest, a base, an articulated arm, a first locking mechanism, a second locking mechanism, an unlocking mechanism, a linkage mechanism, a first synchronization mechanism, and a second synchronization mechanism. The seat includes the footrest structure. The footrest structure of the present invention can be unlocked by the unlocking mechanism. When the footrest needs to be folded or unfolded, it is only necessary to unlock it through the unlocking mechanism and push or pull the footrest. The footrest can then rotate relative to the articulated arm, and simultaneously drive the articulated arm to rotate relative to the base, thereby achieving the effect of synchronized retraction and extension of the footrest and the articulated arm. The operation of retracting and extending the footrest is simple and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of seats, and in particular to a linked retractable and extendable footrest structure and a seat. Background Art

[0002] At present, some types of seats are equipped with footrests. The footrests used in seats usually have a foldable function. When in use, the footrests are in an unfolded state, which can support the user's legs and feet and improve the comfort of using the seat. After use, the footrests are in a folded state to reduce space occupancy. In related technologies, the footrests have too many folding and unfolding movements, and the user's operation of folding and unfolding the footrests is cumbersome, which is not conducive to use. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a pedal structure that can be retracted and extended in a linked manner, which can improve the convenience of retracting and extending the pedal.

[0004] The present invention also provides a chair having the above-mentioned linked retractable and extendable footrest mechanism.

[0005] The linked retractable and extendable pedal structure according to the first embodiment of the present invention includes:

[0006] pedals;

[0007] base;

[0008] The articulated arm comprises a joint portion and a first end portion and a second end portion respectively connected to both ends of the joint portion, wherein the first end portion is connected to the pedal by rotating around a first direction, and the second end portion is connected to the base by rotating around the first direction;

[0009] a first locking mechanism partially accommodated in the first end portion, the first locking mechanism comprising a first locking tooth and a second locking tooth slidably connected along a first direction, and a first elastic member respectively abutting against the second locking tooth and the pedal along the first direction;

[0010] an unlocking mechanism comprising a linkage cable, one end of which is connected to a first locking tooth and is capable of pulling the first locking tooth to rotate, causing the first locking tooth to push the second locking tooth to move, thereby releasing the lock on the first end portion from the second locking tooth, and the second locking tooth being capable of moving in the opposite direction under the elastic force of the first elastic member and restoring the lock on the first end portion;

[0011] a second locking structure partially accommodated in the second end portion, the second locking mechanism comprising a third locking tooth and a fourth locking tooth slidably connected along the first direction, and a second elastic member respectively abutting against the fourth locking tooth and the second end portion along the first direction;

[0012] a linkage mechanism housed in the joint portion, one end of the linkage mechanism being connected to the first locking mechanism, and the other end being connected to the third locking tooth; the linkage mechanism being capable of pulling the third locking tooth to rotate in response to the rotation of the first locking tooth, so that the third locking tooth pushes the fourth locking tooth to move, thereby releasing the locking of the base by the fourth locking tooth; and the fourth locking tooth being capable of moving in the opposite direction under the elastic force of the second elastic member, thereby resuming the locking of the base;

[0013] A first synchronization mechanism includes a first synchronization wheel accommodated in the first end portion, and a transmission member located in the joint portion, the first synchronization wheel is connected to the pedal, and the transmission member is transmission-connected to the first synchronization wheel;

[0014] The second synchronization mechanism is accommodated in the second end portion. The second synchronization mechanism includes a second synchronization wheel. The second synchronization wheel is in transmission connection with the transmission member. The second synchronization wheel is connected to the base.

[0015] The linked retractable and extendable pedal structure according to the embodiment of the present invention has at least the following beneficial effects:

[0016] The footrest structure in the present invention can be unlocked through an unlocking mechanism. When the footrest needs to be folded or unfolded, it is only necessary to unlock it through the unlocking mechanism and push and pull the footrest. The footrest can rotate relative to the joint arm and at the same time drive the joint arm to rotate relative to the base, thereby achieving the effect of synchronous retraction and extension of the footrest and the joint arm. The operation of retracting and extending the footrest is simple and convenient.

[0017] According to some embodiments of the present invention, the unlocking mechanism further includes a pushing member, one end of the linkage cable away from the first locking tooth is connected to the pushing member, and the pushing member is slidably connected to the pedal.

[0018] According to some embodiments of the present invention, the linkage mechanism includes a first linkage rod, a second linkage rod and a connecting cable, one end of the first linkage rod is connected to the second locking tooth, and the other end abuts against one end of the second linkage rod, the other end of the second linkage rod is connected to one end of the connecting cable, the other end of the connecting cable is connected to the third locking tooth, and the second linkage rod is rotatably connected to the joint portion;

[0019] The first linkage rod can move toward the second locking mechanism following the movement of the second locking tooth, so that the second linkage rod pulls the connecting rope and rotates the third locking tooth.

[0020] According to some embodiments of the present invention, the first locking tooth includes a first pushing tooth protruding toward the second locking tooth, the first pushing tooth having an inclined first guide slope, and the first guide slope abuts against the second locking tooth along the first direction;

[0021] The third locking tooth includes a second pushing tooth protruding toward the fourth locking tooth, the second pushing tooth has an inclined second guide slope, and the second guide slope abuts against the fourth locking tooth along the first direction.

[0022] According to some embodiments of the present invention, the first locking tooth includes a first body and a first connecting portion, the first connecting portion is connected to the linkage cable, the first connecting portion and the first pushing tooth are both connected to a side of the first body facing the second locking tooth, a first limiting groove is provided on a side of the second locking tooth, a portion of the first body is accommodated in the first limiting groove, and the first limiting groove is capable of limiting the rotation angle of the first locking tooth;

[0023] The third locking tooth includes a second body and a second connecting part, the second connecting part is connected to the linkage mechanism, the second connecting part and the second pushing tooth are both connected to the side of the second body facing the fourth locking tooth, and the side of the fourth locking tooth is provided with a second limiting groove, the second connecting part is accommodated in the second limiting groove, and the second limiting groove can limit the rotation angle of the fourth locking tooth.

[0024] According to some embodiments of the present invention, the pedal includes a first mounting portion, the first mounting portion is rotatably connected to the first end portion, a first guide groove extending along a first direction is provided inside the first mounting portion, a second guide groove extending along the first direction is provided inside the first end portion, and a first guide protrusion is provided on a side portion of the second locking tooth, and the first guide protrusion can be inserted into the first guide groove and exit the second guide groove, or inserted into the second guide groove and exit the first guide groove;

[0025] The base includes a second mounting portion, which is rotatably connected to the second end portion, a third guide groove extending along the first direction is provided inside the second mounting portion, a fourth guide groove extending along the first direction is provided inside the second end portion, and a second guide protrusion is provided on the side of the fourth locking tooth, and the second guide protrusion can be inserted into the third guide groove and exit from the fourth guide groove, or inserted into the third guide groove and exit from the third guide groove.

[0026] According to some embodiments of the present invention, the second end portion is rotatably connected to the base via a transmission shaft, the second synchronous wheel is rotatably connected to the transmission shaft, a rotating shaft extending along the first direction is provided inside the second end portion, the rotating shaft is spaced apart from the transmission shaft, the second synchronous wheel has a first arc-shaped groove extending along the first direction, the rotating shaft is passed through the first arc-shaped groove, and the first arc-shaped groove is used to limit the rotation angle of the second synchronous wheel so that the second guide protrusion can be aligned with and inserted into the third guide groove or the fourth guide groove.

[0027] According to some embodiments of the present invention, the second synchronization mechanism also includes a third synchronization wheel, the rotating shaft is provided in the third synchronization wheel and is rotationally connected to the third synchronization wheel, the third synchronization wheel is engaged with the inside of the second synchronization wheel, the third synchronization wheel rotates synchronously with the first synchronization wheel through the transmission member, the third synchronization wheel is provided with a second arc groove passing through the first direction, the transmission shaft is provided in the second arc groove, the second arc groove is used to limit the rotation angle of the third synchronization wheel, and the rotation angle of the second synchronization wheel is smaller than the rotation angle of the third synchronization wheel.

[0028] According to some embodiments of the present invention, the first synchronous wheel and the first locking mechanism are distributed along a first direction, the pedal includes a rotating portion, the rotating portion extends along the first direction and is arranged inside the first end portion, the first locking tooth and the second locking tooth are arranged around the outside of the rotating portion, the rotating portion is connected to the first synchronous wheel, and can drive the first synchronous wheel to rotate.

[0029] A seat according to an embodiment of the second aspect of the present invention includes:

[0030] The linked retractable and extendable pedal structure of the first aspect embodiment;

[0031] A seat chassis is provided, wherein the base is mounted on the seat chassis.

[0032] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0034] Figure 1 A schematic diagram of a use state of the linked retractable and extendable pedal structure of the present invention;

[0035] Figure 2 A schematic diagram of another usage state of the linked retractable and extendable pedal structure of the present invention;

[0036] Figure 3 To hide Figure 1 Schematic diagram of the middle joint arm and the pedal;

[0037] Figure 4 A cross-sectional view of the first end portion of the pedal structure that is linked to retract and extend;

[0038] Figure 5 is a schematic diagram of the cooperation between the first locking mechanism and the pedal;

[0039] Figure 6 A cross-sectional view of the second end portion of the pedal structure that is linked to be retracted and extended;

[0040] Figure 7 is a schematic diagram of the cooperation between the second locking mechanism and the base;

[0041] Figure 8 Schematic diagram of the cooperation between the unlocking mechanism and the pedal;

[0042] Figure 9 is a schematic diagram of an embodiment of a linkage mechanism;

[0043] Figure 10 is a cross-sectional view of an embodiment of an articulated arm;

[0044] Figure 11 for Figure 5 An exploded schematic diagram of the first locking mechanism;

[0045] Figure 12 for Figure 7 An exploded schematic diagram of the second locking mechanism;

[0046] Figure 13 is a schematic diagram of a first end portion and a second end portion of the articulated arm;

[0047] Figure 14 Schematic diagram of the cooperation between the first locking tooth and the second locking tooth;

[0048] Figure 15 It is an exploded schematic diagram of the first synchronization mechanism and the second synchronization mechanism.

[0049] Reference numerals:

[0050] Footrest 100, avoidance opening 110, first mounting portion 120, first guide groove 121, rotating portion 130;

[0051] Articulated arm 200, joint portion 210, partition plate 211, end plate 212, mounting cavity 213, first end portion 220, second guide groove 221, first separator 222, second end portion 230, fourth guide groove 231, rotating shaft 232, second separator 233;

[0052] Base 300, second mounting portion 310, third guide groove 311, transmission shaft 320;

[0053] First locking mechanism 400, first locking tooth 410, first pushing tooth 411, first body 412, first connecting portion 413, second locking tooth 420, first abutting wall 421, first limiting groove 422, first guide protrusion 423, first elastic member 430;

[0054] The second locking mechanism 500, the third locking tooth 510, the second pushing tooth 511, the second body 512, the second connecting portion 513, the fourth locking tooth 520, the second limiting groove 521, the second guide protrusion 522, and the second elastic member 530;

[0055] Unlocking mechanism 600, linkage cable 610, pusher 620, sliding portion 621, and toggle portion 622;

[0056] Linkage mechanism 700, first linkage rod 710, second abutting wall 711, second linkage rod 720, connecting cable 730;

[0057] First synchronization mechanism 800, first synchronization wheel 810, transmission member 820;

[0058] Second synchronization mechanism 900 , second synchronization wheel 910 , first arc-shaped slot 911 , third synchronization wheel 920 , second arc-shaped slot 921 . DETAILED DESCRIPTION

[0059] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0060] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0061] In the description of the present invention, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0062] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0063] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative 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 exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0064] In an embodiment of the present invention, a pedal structure capable of being retracted and extended in a coordinated manner (hereinafter referred to as the pedal structure) is provided, which can realize the coordinated retraction and extension of the pedal 100. Figure 1 and Figure 2 The pedal structure includes a pedal 100, a base 300 and a joint arm 200. The two ends of the joint arm 200 are rotatably connected to the pedal 100 and the base 300 respectively. When the pedal 100 is close to the joint arm 200 and the joint arm 200 is close to the base 300, the pedal 100 appears as follows. Figure 1 In the folded state shown, the pedal 100 is unfolded relative to the articulated arm 200, and the articulated arm 200 is unfolded relative to the base 300, the pedal 100 appears as follows Figure 2 Shown in the expanded state.

[0065] The articulated arm 200 includes a joint portion 210, a first end portion 220 and a second end portion 230. The first end portion 220 and the second end portion 230 are respectively connected to the two ends of the joint portion 210. The first end portion 220 is connected to the pedal 100 by rotating around a first direction, and the second end portion 230 is connected to the base 300 by rotating around the first direction. Therefore, the pedal 100 can rotate relative to the articulated arm 200, so that the pedal 100 can be folded or unfolded relative to the articulated arm 200, and the articulated arm 200 can rotate relative to the base 300, so that the articulated arm 200 can be folded or unfolded relative to the base 300.

[0066] like Figure 3 As shown, the pedal structure also includes a first locking mechanism 400, a second locking mechanism 500, an unlocking mechanism 600 and a linkage mechanism 700, Figure 4 and Figure 5At least part of the first locking mechanism 400 is located inside the first end portion 220. The first locking mechanism 400 connects the first end portion 220 and the pedal 100 and can lock the pedal 100 and the articulated arm 200. At this time, the pedal 100 cannot rotate relative to the articulated arm 200, or the first locking mechanism 400 releases the lock on the pedal 100 and the articulated arm 200, allowing the pedal 100 to rotate relative to the articulated arm 200, thereby realizing the folding or unfolding of the pedal 100 relative to the articulated arm 200. Figure 6 and Figure 7 At least a portion of the second locking mechanism 500 is located within the second end portion 230. The second locking mechanism 500 connects the second end portion 230 to the base 300 and can lock the base 300 and the articulated arm 200, preventing the articulated arm 200 from rotating relative to the base 300. Alternatively, the second locking mechanism 500 releases the lock between the articulated arm 200 and the base 300, allowing the articulated arm 200 to rotate relative to the base 300, thereby folding or unfolding the articulated arm 200 relative to the base 300. The unlocking mechanism 600 includes a linkage cable 610 connected to the first locking mechanism 400. When the linkage cable 610 is pulled, the relevant components of the first locking mechanism 400 are activated, and the lock between the pedal 100 and the articulated arm 200 is released. The two ends of the linkage mechanism 700 are respectively connected to the first locking mechanism 400 and the second locking mechanism 500. When the relevant components in the first locking mechanism 400 are pulled by the linkage rope 610 and move, the power transmission of the linkage mechanism 700 causes the relevant components in the second locking mechanism 500 to move synchronously, so that the second locking mechanism 500 releases the lock on the articulated arm 200 and the base 300, thereby realizing the linkage unlocking of the first locking mechanism 400 and the second locking mechanism 500.

[0067] The pedal structure also includes a first synchronization mechanism 800 and a second synchronization mechanism 900. The first synchronization mechanism 800 is connected to the first end 220, and the second synchronization mechanism 900 is connected to the second end 230. The first synchronization mechanism 800 and the second synchronization mechanism 900 can move synchronously. When the first synchronization mechanism 800 rotates relative to the articulated arm 200, it can move synchronously and drive the second synchronization mechanism 900 to move. The second synchronization mechanism 900 then drives the articulated arm 200 to rotate relative to the base 300. Therefore, when the pedal 100 can be rotated relative to the articulated arm 200 and folded or unfolded, the articulated arm 200 can simultaneously rotate and fold or unfold relative to the base 300, so that the pedal 100 and the articulated arm 200 can be retracted and unfolded in conjunction; and, when the pedal 100 needs to be folded or unfolded, it is only necessary to unlock it through the unlocking mechanism 600 and push and pull the pedal 100, so that the pedal 100 can be rotated relative to the articulated arm 200, and at the same time drive the articulated arm 200 to rotate relative to the base 300, so as to achieve the effect of synchronous retraction and extension of the pedal 100 and the articulated arm 200. The operation of retracting and unfolding the pedal 100 is simple and convenient.

[0068] The following is a detailed explanation of the structural components of the first locking mechanism 400 , the second locking mechanism 500 , the unlocking mechanism 600 , the linkage mechanism 700 , the first synchronization mechanism 800 , and the second synchronization mechanism 900 .

[0069] Reference Figures 3 to 5 The first locking mechanism 400 includes a first locking tooth 410 and a second locking tooth 420 that are slidingly connected along the first direction, and also includes a first elastic member 430 that abuts against the second locking tooth 420 and the pedal 100 along the first direction. One end of the linkage cable 610 is connected to the first locking tooth 410. When the linkage cable 610 is pulled, the first locking tooth 410 rotates within the first end portion 220 and pushes the second locking tooth 420 to move away from the first end portion 220 along the first direction. During this process, the first elastic member 430 is compressed. When the component used by the second locking tooth 420 to lock the first end portion 220 exits the first end portion 220, the lock of the first end portion 220 by the second locking tooth 420 is released. At this time, the pedal 100 can rotate relative to the joint arm 200. During the rotation of the pedal 100 relative to the articulated arm 200, the first elastic member 430 is continuously compressed by the compressive force of the second locking tooth 420. When the pedal 100 rotates to a corresponding angle relative to the articulated arm 200, the second locking tooth 420 can move in the opposite direction (toward the first end 220) under the elastic force of the first elastic member 430, and the second locking tooth 420 returns to the locked state between the first end 220 and the pedal 100. In this way, when the pedal 100 rotates relative to the articulated arm 200 to the folded state or the unfolded state, it is locked by the first locking mechanism 400, keeping the pedal 100 stable in the folded or unfolded state and preventing sudden changes in the state of the pedal 100 during use.

[0070] Reference Figure 3 、 Figure 6 and Figure 7The second locking mechanism 500 includes a third locking tooth 510 and a fourth locking tooth 520 slidingly connected along the first direction, and also includes a second elastic member 530 respectively abutting the fourth locking tooth 520 and the second end portion 230 along the first direction. One end of the linkage mechanism 700 is connected to the first locking mechanism 400, and the other end is connected to the third locking tooth 510. When the first locking tooth 410 rotates under the drive of the linkage rope 610, it drives the linkage mechanism 700 to move synchronously. The linkage mechanism 700 follows the rotation of the first locking tooth 410 to pull the third locking tooth 510 to rotate, and the third locking tooth 510 pushes the fourth locking tooth 520 to move along the first direction. During this process, the second elastic member 530 is compressed. When the component used by the fourth locking tooth 520 to lock the base 300 exits the base 300, the fourth locking tooth 520 releases the lock on the base 300. At this time, the articulated arm 200 can rotate relative to the base 300. During the rotation of the articulated arm 200 relative to the base 300, the second elastic member 530 is continuously compressed by the compressive force of the fourth locking tooth 520. When the articulated arm 200 is rotated to a corresponding angle relative to the base 300, the fourth locking tooth 520 is able to move in the opposite direction (toward the base 300) under the elastic force of the second elastic member 530, and the fourth locking tooth 520 is restored to the locked state between the second end portion 230 and the base 300. In this way, the first locking mechanism 400 and the second locking mechanism 500 are simultaneously unlocked and locked. Moreover, when the articulated arm 200 is rotated relative to the base 300 to the folded or unfolded state, it is locked by the second locking mechanism 500, thereby stabilizing the articulated arm 200 in the folded or unfolded state.

[0071] The first synchronization mechanism 800 includes a first synchronization wheel 810, which is located in the first end portion 220 and is connected to the pedal 100. When the pedal 100 is rotated, the first synchronization wheel 810 rotates synchronously with the pedal 100. The first synchronization mechanism 800 also includes a transmission member 820, which is located inside the joint portion 210. The second synchronization mechanism 900 includes a second synchronization wheel 910. The second synchronization wheel 910 and the first synchronization wheel 810 are both transmission-connected to the transmission member 820, and the second synchronization wheel 910 is connected to the base 300. When the first synchronous wheel 810 rotates following the pedal 100, the pedal 100 is folded or unfolded relative to the articulated arm 200. Through the power transmission of the transmission member 820, the second synchronous wheel 910 rotates synchronously following the first synchronous wheel 810. Since the second synchronous wheel 910 is connected to the base 300, the articulated arm 200 can be synchronously folded or unfolded relative to the base 300. In this way, the pedal 100 can be synchronously retracted and extended relative to the articulated arm 200 and the articulated arm 200 can be synchronously retracted and extended relative to the base 300 by pushing and pulling the pedal 100, which effectively simplifies the movement of retracting and extending the pedal 100.

[0072] It should be noted that by accommodating part of the first locking mechanism 400 and the first synchronization mechanism 800 inside the first end portion 220, part of the second locking mechanism 500 and the second synchronization mechanism 900 inside the second end portion 230, and the linkage mechanism 700 inside the joint portion 210, the appearance of the pedal structure is made simpler, and the joint arm 200 can protect the above-mentioned multiple mechanisms, reducing the impact of the external environment on the contraction and extension of the pedal 100.

[0073] Since the first locking tooth 410 is located inside the first end portion 220, the linkage cable 610 needs to be inserted into the first end portion 220 and connected to the first locking tooth 410. In some embodiments, the other end of the linkage cable 610 is exposed outside the articulated arm 200, making it easier for the user to pull the linkage cable 610. In another embodiment of the present invention, referring to Figure 1 and Figure 3 , the linkage cable 610 is coupled to the pedal 100. When the pedal 100 needs to be retracted or extended, the corresponding components on the pedal 100 can be directly operated to activate the linkage cable 610 and achieve unlocking. Specifically, the unlocking mechanism 600 further includes a pushing member 620. The end of the linkage cable 610 away from the first locking tooth 410 is connected to the pushing member 620, and the pushing member 620 is slidably connected to the pedal 100. When unlocking is required, the pushing member 620 is pushed to slide relative to the pedal 100. The pushing member 620 drives the linkage cable 610 to pull the first locking tooth 410 to rotate, thereby completing the unlocking.

[0074] Further, such as Figure 1 and Figure 8 As shown, the pedal 100 has an inner cavity, and the pusher 620 includes a connected sliding portion 621 and a toggle portion 622. The sliding portion 621 is located in the inner cavity and is slidably connected to the pedal 100. The linkage cable 610 is accommodated in the inner cavity, and one end of the linkage cable 610 is connected to the sliding portion 621. The pedal 100 has an avoidance opening 110, which is connected to the inner cavity. The toggle portion 622 is passed through the avoidance opening 110 and is partially exposed to the outside of the pedal 100. When the toggle portion 622 is toggled, the toggle portion 622 moves in the avoidance opening 110 and drives the sliding portion 621 to slide relative to the pedal 100. Driven by the sliding portion 621, the linkage cable 610 pulls the first locking tooth 410 to rotate. Therefore, unlocking can be achieved by simply toggling the toggle portion 622, which is relatively convenient to operate. In addition, the linkage cable 610 is housed inside the pedal 100, making the appearance of the pedal structure simpler. The linkage cable 610 is limited by the inner wall of the pedal 100, which can prevent the linkage cable 610 from twisting or entangled when moving.

[0075] In addition, a rib may be provided inside the pedal 100 to guide the sliding of the sliding portion 621. The sliding portion 621 is located inside the rib. The rib limits the sliding portion 621 during its sliding, preventing the sliding portion 621 from deviating relative to the pedal 100 during its sliding, thereby further stabilizing the connection between the sliding portion 621 and the pedal 100. It is understood that a channel may be provided inside the pedal 100 to guide the movement of the linkage cable 610, thereby confining the linkage cable 610 within the channel. When the linkage cable 610 is pulled by the pusher 620, the linkage cable 610 moves within the channel, thereby reducing interference between the linkage cable 610 and other components within the pedal 100 and preventing the linkage cable 610 from becoming entangled or stuck.

[0076] In one embodiment, the linkage mechanism 700 includes a connecting rope 730 whose two ends are respectively connected to the first locking tooth 410 and the third locking tooth 510. When the first locking tooth 410 is rotated by the pull of the linkage rope 610, the first locking tooth 410 synchronously pulls the connecting rope 730, so that the third locking tooth 510 rotates synchronously under the drive of the connecting rope 730, thereby realizing the synchronous unlocking of the first locking mechanism 400 and the second locking mechanism 500.

[0077] In another embodiment, Figure 3 As shown, the linkage mechanism 700 includes a first linkage rod 710, a second linkage rod 720 and a connecting rope 730, one end of the first linkage rod 710 is connected to the second locking tooth 420, and the other end abuts the second linkage rod 720, one end of the second linkage rod 720 abuts the first linkage rod 710, and the other end is connected to the connecting rope 730, one end of the connecting rope 730 is connected to the third locking tooth 510, the second linkage rod 720 is rotatably connected to the joint part 210, and multiple abutment positions of the second linkage rod 720 and the first linkage rod 710 and the connection position of the second linkage rod 720 and the connecting rope 730 are respectively located on both sides of the connection position of the second linkage rod 720 and the joint part 210. Thus, when the second locking tooth 420 moves, the first linkage rod 710 is driven by the second locking tooth 420 to move toward the second locking mechanism 500, and the first linkage rod 710 pushes the second linkage rod 720 to rotate relative to the joint part 210. During the rotation of the second linkage rod 720, the connecting rope 730 is pulled, and the third locking tooth 510 is driven by the connecting rope 730 to rotate, thereby pushing the fourth locking tooth 520 to move, thereby realizing the linkage unlocking of the first locking mechanism 400 and the second locking mechanism 500.

[0078] Further, such as Figure 9As shown, the outer periphery of the second locking tooth 420 has an inclined first abutting wall 421, and the outer diameter of the first abutting wall 421 gradually increases toward the direction approaching the first locking tooth 410. One end of the first linkage rod 710 is provided with an inclined second abutting wall 711, and the second abutting wall 711 is inclined toward the second locking tooth 420 in the direction toward the first locking tooth 410, and the first abutting wall 421 and the second abutting wall 711 abut against each other; when the second locking tooth 420 moves away from the first locking tooth 410, the outer diameter of the part of the first abutting wall 421 abutting against the second abutting wall 711 gradually increases, and pushes the first linkage rod 710 to move toward the second locking mechanism 500, thereby realizing the synchronous unlocking of the first locking mechanism 400 and the second locking mechanism 500.

[0079] It should be noted that if Figure 10 As shown, the joint part 210 includes a partition 211 and end plates 212 respectively connected to both sides of the partition 211, and an installation cavity 213 is defined between the end plate 212 and the partition 211. The joint part 210 is provided with two mutually isolated installation cavities 213 along the first direction, the linkage mechanism 700 is located in one of the installation cavities 213, and the first end 220 and the second end 230 are connected to the two ends of the partition 211. On the one hand, the second linkage rod 720 can be rotatably connected to the end plate 212 or the partition 211, and the end plate 212 and the partition 211 provide an installation basis for the second linkage rod 720. On the other hand, the first linkage rod 710, the second linkage rod 720 and the connecting rope 730 are limited between the partition 211 and the end plate 212, so that the first linkage rod 710 moves smoothly and the second linkage rod 720 rotates smoothly, avoiding the first linkage rod 710 and the second linkage rod 720 from being misaligned with each other, and the first linkage rod 710 and the second linkage rod 720 can continue to maintain a resistance state.

[0080] In addition, a groove is provided on the side of the second linkage rod 720 facing the first linkage rod 710, and the groove is provided toward the first linkage rod 710. The end of the first linkage rod 710 abuts against the groove wall of the groove, and the groove wall limits the first linkage rod 710 to prevent the first linkage rod 710 from generating relative displacement relative to the second linkage rod 720.

[0081] In the present invention, the first locking tooth 410 is pulled by the linkage rope 610, and the rotation of the first locking tooth 410 is converted into the movement of the second locking tooth 420. After the second locking tooth 420 moves a certain distance away from the first end 220, unlocking is achieved; similarly, the third locking tooth 510 is rotated by the pulling of the connecting rope 730, and is converted into the movement of the second locking tooth 420. After the second locking tooth 420 moves a certain distance away from the base 300, unlocking is achieved.

[0082] Specifically, the first locking tooth 410 includes a first pushing tooth 411 protruding toward the second locking tooth 420, and the first pushing tooth 411 has an inclined first guide slope, and the first guide slope abuts against the second locking tooth 420 along the first direction; therefore, when the first locking tooth 410 rotates, the position where the first pushing tooth 411 abuts against the second locking tooth 420 gradually changes, and pushes the second locking tooth 420 to move toward the pedal. When the second locking tooth 420 moves to the preset position, the lock between the first end portion 220 and the pedal 100 is released, and the pedal 100 can now rotate relative to the articulated arm 200. Similarly, if Figure 12 As shown, the third locking tooth 510 includes a second pushing tooth 511 protruding toward the fourth locking tooth 520, and the second pushing tooth 511 has an inclined second guide slope, and the second guide slope abuts against the fourth locking tooth 520 along the first direction; thus, when the third locking tooth 510 rotates, the positions of the second pushing tooth 511 and the fourth locking tooth 520 gradually change, and push the fourth locking tooth 520 to move back to the base 300. When the fourth locking tooth 520 moves to the preset position, the lock on the base 300 and the second end 230 is released, and at this time the articulated arm 200 can rotate relative to the base 300.

[0083] Furthermore, the second locking tooth 420 is provided with a first guide groove for cooperating with the first guide ramp on the end facing the first locking tooth 410. The first guide groove is recessed, and the first guide ramp is inserted into the first guide groove. The inclination direction of the groove wall in the first guide groove is the same as the inclination direction of the first guide ramp. The first guide ramp abuts against the groove wall. During the rotation of the first guide ramp, the second locking tooth 420 is pushed by abutting against the groove wall. The fourth locking tooth 520 is provided with a second guide groove for cooperating with the second guide ramp on the side facing the third locking tooth 510. The second guide groove is recessed, and the second guide ramp is inserted into the second guide groove. The inclination direction of the groove wall in the second guide groove is the same as the inclination direction of the second guide ramp. The second guide ramp abuts against the groove wall. During the rotation of the second guide ramp, the fourth locking tooth 520 is pushed by abutting against the groove wall.

[0084] Multiple first pushing teeth 411 can be provided, and multiple first pushing teeth 411 are arranged at intervals along the circumference of the first locking tooth 410, and the number and position of the first guide groove correspond to those of the first pushing teeth 411. Through the cooperation of the multiple first pushing teeth 411 and the first guide groove, the movement of the second locking tooth 420 when pushed by the first locking tooth 410 is smoother; multiple second pushing teeth 511 can be provided, and multiple second pushing teeth 511 are arranged at intervals along the circumference of the third locking tooth 510, and the number and position of the second guide groove correspond to those of the second pushing teeth 511. Through the cooperation of the multiple second pushing teeth 511 and the third guide groove, the movement of the fourth locking tooth 520 when pushed by the third locking tooth 510 is smoother.

[0085] In one embodiment of the present invention, Figure 11 As shown, the first locking tooth 410 includes a first body 412 and a first connecting portion 413, the first connecting portion 413 is connected to the linkage cable 610, the first connecting portion 413 and the first pushing tooth 411 are both connected to the side of the first body 412 facing the second locking tooth 420, and the side of the second locking tooth 420 is provided with a first limiting groove 422, at least part of the first body 412 is accommodated in the first limiting groove 422, and the first limiting groove 422 is used to limit the rotation angle of the first locking tooth 410; the first body 412 is inserted into the first limiting groove 422 in the first direction, and the first locking tooth 410 is rotated. The connection between the tooth 410 and the second locking tooth 420 is more compact. When the linkage rope 610 pulls the first locking tooth 410 to rotate, the first body 412 rotates along the circumference of the first locking tooth 410 in the first limiting groove 422. When the first body 412 abuts against the groove walls on opposite sides of the first limiting groove 422, it is limited by the first limiting groove 422 to limit the rotation angle of the first locking tooth 410, thereby achieving the effect of limiting the moving distance of the second locking tooth 420, avoiding excessive rotation of the second locking tooth 420, and enabling the first locking mechanism 400 to be unlocked and locked stably.

[0086] like Figure 12 As shown, the third locking tooth 510 includes a second body 512 and a second connecting portion 513, the second connecting portion 513 is connected to the connecting rope 730, the second connecting portion 513 and the second pushing tooth 511 are both connected to the side of the second body 512 facing the fourth locking tooth 520, and the side of the fourth locking tooth 520 is provided with a second limiting groove 521, at least part of the second body 512 is accommodated in the second limiting groove 521, and the second limiting groove 521 is used to limit the rotation angle of the fourth locking tooth 520; the second body 512 is inserted into the second limiting groove 521 in the second direction, and the third locking tooth 520 is rotated. The connection between the locking tooth 510 and the fourth locking tooth 520 is more compact. When the connecting rope 730 pulls the third locking tooth 510 to rotate, the second body 512 rotates along the circumference of the third locking tooth 510 in the second limiting groove 521. When the second body 512 abuts the groove walls on opposite sides of the second limiting groove 521, it is limited by the second limiting groove 521 to limit the rotation angle of the third locking tooth 510, thereby achieving the effect of limiting the moving distance of the fourth locking tooth 520, avoiding excessive rotation of the fourth locking tooth 520 and affecting the unlocking and locking of the second locking mechanism 500.

[0087] like Figure 11 and Figure 13As shown, the pedal 100 includes a first mounting portion 120, which is rotatably connected to the first end portion 220. A first guide groove 121 extending along the first direction is provided inside the first mounting portion 120, and a second guide groove 221 extending along the first direction is provided inside the first end portion 220. A first guide protrusion 423 is provided on the side of the second locking tooth 420. When the pedal 100 is rotated to a folded or unfolded state, the positions of the first guide groove 121 and the second guide groove 221 in the first direction correspond, and the first guide protrusion 423 can enter and exit the first guide groove 121 and the second guide groove 221. Specifically, when the first locking tooth 410 is pulled by the linkage rope 610 to move toward the pedal 100, the first guide protrusion 423 withdraws from the second guide groove 221 and enters the first guide groove 121. At this time, the first end portion 220 is unlocked from the pedal 100; when the first guide protrusion 423 is moved back toward the pedal 100 by the rebound force of the first elastic member 430, the first guide protrusion 423 withdraws from the first guide groove 121 and enters the second guide groove 221. At this time, the first end portion 220 and the pedal 100 are restored to a locked state.

[0088] Similarly, if Figure 12 and Figure 13 As shown, the base 300 includes a second mounting portion 310, which is rotatably connected to the second end portion 230. The interior of the second mounting portion 310 is provided with a third guide groove 311 extending along the first direction, and the interior of the second end portion 230 is provided with a fourth guide groove 231 extending along the first direction. The side of the fourth locking tooth 520 is provided with a second guide protrusion 522. When the articulated arm 200 is rotated to a folded or unfolded state, the positions of the third guide groove 311 and the fourth guide groove 231 in the first direction correspond, and the second guide protrusion 522 can enter and exit the third guide groove 311 and the fourth guide groove 231. Specifically, when the third locking tooth 510 is pulled by the connecting rope 730 and moved toward the base 300, the second guide protrusion 522 withdraws from the third guide groove 311 and enters the fourth guide groove 231. At this time, the second end 230 and the base 300 are unlocked; when the second guide protrusion 522 is moved toward the pedal 100 by the rebound force of the second elastic member 530, the second guide protrusion 522 withdraws from the fourth guide groove 231 and enters the first receiving guide groove. At this time, the second end 230 and the base 300 are restored to a locked state.

[0089] The first guide groove 121 and the second guide groove 221 have the same position and number, and the third guide groove 311 and the fourth guide groove 231 have the same position and number, so as to facilitate the first guide protrusion 423 to enter and exit the first guide groove 121 and the second guide groove 221, and the second guide protrusion 522 to enter and exit the third guide groove 311 and the fourth guide groove 231.

[0090] In addition, the number and position of the guide grooves can be set according to the retraction and extension angles of the pedal 100 and the articulated arm 200. Taking the retraction and extension angle of the pedal 100 relative to the articulated arm 200 as an example (the retraction and extension angle of the articulated arm 200 relative to the base 300 is the same), there are two first guide grooves 121 and two second guide grooves 221, and they are evenly distributed along the circumference. If the first guide groove 121 and the second guide groove 221 are aligned along the first direction when the pedal 100 is in the folded state, then after the first locking tooth 410 and the second locking tooth 420 rotate 180° relative to each other, the first guide groove 121 and the second guide groove 221 are aligned again, and the retraction and extension angle of the pedal 100 is 180°; there are three first guide grooves 121 and the second guide groove 221, and they are evenly distributed along the circumference. If the first guide groove 121 and the second guide groove 221 are aligned along the first direction when the pedal 100 is in the folded state, then after the first locking tooth 410 and the second locking tooth 420 rotate 180° relative to each other, the first guide groove 121 and the second guide groove 221 are aligned again, and the retraction and extension angle of the pedal 100 is 180°. When the pedal 100 is in the folded state, the two guide grooves 221 are aligned along the first direction. After the first locking tooth 410 and the second locking tooth 420 rotate 120° relative to each other, the first guide groove 121 and the second guide groove 221 are aligned again, and the retraction angle of the pedal 100 is 120°. There are four first guide grooves 121 and four second guide grooves 221, which are evenly distributed along the circumference. If the first guide grooves 121 and the second guide grooves 221 are aligned along the first direction when the pedal 100 is in the folded state, after the first locking tooth 410 and the second locking tooth 420 rotate 90° relative to each other, the first guide groove 121 and the second guide groove 221 are aligned again, and the retraction angle of the pedal 100 is 90°. It should be noted that the number and position of the guide grooves can also be set to other forms according to the specific retraction and extension requirements of the pedal 100 and the articulated arm 200, and in combination with the movement requirements of the first locking mechanism 400 and the second locking mechanism 500.

[0091] It should be noted that if Figure 11 The pedal 100 also includes a rotating portion 130, which is connected to the first mounting portion 120 and extends along the first direction. The rotating portion 130 is arranged inside the first end portion 220, and the first locking tooth 410 and the second locking tooth 420 are arranged around the outside of the rotating portion 130; when the linkage cable 610 pulls the first locking tooth 410 to rotate, the first locking tooth 410 rotates around the rotating portion 130 and simultaneously pushes the second locking tooth 420 to move along the rotating portion 130. The rotating portion 130, the first guide groove 121 and the second guide groove 221 can all guide the movement of the first guide protrusion 423.

[0092] In addition, if Figure 10A first separator 222 is provided within the first end portion 220. The first separator 222 divides the inner cavity of the first end portion 220 into two cavities along a first direction. The first locking mechanism 400 is located in one cavity, and the first synchronous wheel 810 is located in the other cavity. The rotating portion 130 passes through the first separator 222, with one portion being rotationally connected to the first locking mechanism 400 and the other portion being connected to the first synchronous wheel 810 and capable of driving the first synchronous wheel 810 to rotate. The inner wall of the first end portion 220 protrudes inward to form a retaining structure. Because the first connecting portion 413 is connected to the side of the first body facing the pedal 100, one end of the first connecting portion 413 is retained by the first separator 222, while the other end is retained by the retaining structure. This constrains the first locking tooth 410 between the retaining structure and the first separator 222, leaving it with only rotational freedom.

[0093] Reference Figure 14 When the second locking tooth 420 moves, the second locking tooth 420 moves away from the first locking tooth 410, the first body 412 withdraws from the first limiting groove 422, and the first connecting portion 413 enters the first limiting groove 422. After the first locking mechanism 400 is unlocked and the pedal 100 rotates relative to the joint arm 200, the second locking tooth 420 follows the pedal 100 and rotates relative to the first locking tooth 410. The first connecting portion 413 rotates along the circumferential direction of the first locking tooth 410 in the first limiting groove 422. When the first connecting portion 413 rotates to the unfolded or folded state of the pedal 100, the first connecting portion 413 respectively abuts against the two opposite side walls of the first limiting groove 422, and the first locking tooth 410 cannot continue to rotate relative to the second locking tooth 420, thereby achieving the effect of limiting the rotation angle of the pedal 100. The opening degree of the first limiting groove 422 can be set accordingly according to the folding and unfolding angle of the pedal 100.

[0094] In one embodiment, Figure 3 and Figure 15 As shown, the second end portion 230 is rotatably connected to the base 300 via the transmission shaft 320, and the second synchronous wheel 910 is rotatably connected to the transmission shaft 320, as shown in FIG. Figure 12A rotating shaft 232 extending along the first direction is provided inside the second end portion 230. The rotating shaft 232 is spaced apart from the transmission shaft 320. The second synchronous wheel 910 has a first arc-shaped groove 911 extending along the first direction. The rotating shaft 232 is passed through the first arc-shaped groove 911. The first arc-shaped groove 911 is used to limit the rotation angle of the second synchronous wheel 910 so that the second guide protrusion 522 can be aligned with and inserted into the third guide groove 311 or the fourth guide groove 231. Specifically, when the articulated arm 200 is retracted and extended by rotating relative to the base 300, the second synchronous wheel 910 drives the second end 230 to rotate relative to the base 300, and the rotating shaft 232 is eccentrically arranged. When the second synchronous wheel 910 rotates, the rotating shaft 232 moves along the first arc groove 911. When the articulated arm 200 rotates to a folded or unfolded state, the rotating shaft 232 abuts against the groove wall at the end of the first arc groove 911, preventing the second synchronous wheel 910 from continuing to rotate, thereby limiting the rotation angle of the second synchronous wheel 910, and when the articulated arm 200 is in a folded or unfolded state, the third guide groove 311 is aligned with the fourth guide groove 231. At this time, the second guide protrusion 522 can move under the drive of the linkage mechanism 700, or move under the elastic force of the second elastic member 530, so that the second locking mechanism 500 is unlocked or locked.

[0095] like Figure 10 As shown, the second end 230 includes a second separator 233, which divides the inner cavity of the second end 230 into two cavities. The second synchronization mechanism 900 is located in one of the cavities, and the second locking mechanism 500 is located in the other cavity. The rotating shaft 232 is connected to the second separator 233 and protrudes toward the second synchronization mechanism 900. The second synchronization wheel 910 can rotate relative to the second end 230. Part of the second synchronization wheel 910 is passed through the second separator 233 and protrudes toward the base 300. The second synchronization wheel 910 is connected to the base 300. When the second synchronization wheel 910 rotates, the second end 230 rotates relative to the base 300, so that the articulated arm 200 can be retracted and expanded relative to the base 300.

[0096] The embodiment of the present invention also takes into account the situation where the retraction and extension angles of the pedal 100 are different from those of the articulated arm 200, and the conversion of the retraction and extension angles is achieved through the second synchronization mechanism 900. Specifically, the second synchronization mechanism 900 includes a third synchronization wheel 920. The rotating shaft 232 is disposed through the third synchronization wheel 920 and is rotationally connected to the third synchronization wheel 920. The third synchronization wheel 920 is engaged with the interior of the second synchronization wheel 910. The third synchronization wheel 920 rotates synchronously with the first synchronization wheel 810 through the transmission member 820. The transmission member 820 can be configured as a synchronous belt, a rack, etc. The rotation angle of the first synchronous wheel 810 is equal to the rotation angle of the pedal 100 relative to the articulated arm 200, and the rotation angle of the second synchronous wheel 910 is equal to the rotation angle of the articulated arm 200 relative to the base 300. Through the power transmission of the transmission member 820, the first synchronous wheel 810 and the second synchronous wheel 910 rotate synchronously, and the rotation angle is the same. The rotation angle of the third synchronous wheel 920 is smaller than the rotation angle of the second synchronous wheel 910. In this way, through the engagement of the third synchronous wheel 920 with the second synchronous wheel 910, the rotation angle of the articulated arm 200 is different from the rotation angle of the third synchronous wheel 920, so that the pedal 100 and the articulated arm 200 can be retracted and extended at different angles. Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the folding and extending angle of the footrest 100 is 180°, and the folding and extending angle of the articulated arm 200 is 120°, so that the footrest 100 can be completely folded to the side of the articulated arm 200, reducing space occupancy and avoiding interference between the articulated arm 200 and other structures on the seat.

[0097] Furthermore, the third synchronous wheel 920 is provided with a second arcuate groove 921 extending along the first direction. The transmission shaft 320 is disposed within the second arcuate groove 921. The second arcuate groove 921 is used to limit the rotation angle of the third synchronous wheel 920. By adjusting the lengths of the first arcuate groove 911 and the second arcuate groove 921, the rotation angle of the second synchronous wheel 910 can be made smaller than the rotation angle of the third synchronous wheel 920. When the third synchronous wheel 920 is limited by the second arcuate groove 921, the second synchronous wheel 910 is also limited by the first arcuate groove 911. At this time, the articulated arm 200 rotates to a folded or unfolded state to ensure that the third guide groove 311 is aligned with the fourth guide groove 231, facilitating unlocking or locking of the second locking mechanism 500.

[0098] The following is the specific process when using the pedal structure:

[0099] Taking the pedal 100 switching from a folded state to an unfolded state as an example (the reverse process of switching from unfolded to folded is the same), when the pedal 100 is in the folded state, the first locking mechanism 400 and the second locking mechanism 500 are both in a locked state. At this time, the first guide protrusion 423 is located in the second guide groove 221, and the second guide protrusion 522 is located in the third guide groove 311. The pedal 100 and the first end 220 are locked, and the second end 230 and the base 300 are locked. The pedal 100 and the joint arm 200 cannot be retracted or unfolded. When the pedal 100 needs to be unfolded, the unlocking mechanism 600 is operated to unlock it, and the pushing member 620 is pushed, so that the linkage cable 610 pulls the first locking tooth 410 to rotate, and the first locking tooth 410 pushes the second locking tooth 420 to move toward the first guide groove 121. The first elastic member 430 is compressed. When the first guide protrusion 423 exits from the second guide groove 221 and enters the first guide groove 121, the first locking mechanism 400 is unlocked. At this time, the pedal 100 can rotate relative to the first end portion 220; the second locking tooth 410 pushes the second locking tooth 420 to move toward the first guide groove 121. The movement of the second locking mechanism 500 simultaneously drives the linkage mechanism 700 to move. The connecting cable 730 pulls the third locking tooth 510 to rotate. The third locking tooth 510 pushes the fourth locking tooth 520 toward the fourth guide slot 231. The second elastic member 530 is compressed. When the second guide protrusion 522 exits the third guide slot 311 and enters the fourth guide slot 231, the second locking mechanism 500 is unlocked. At this time, the articulated arm 200 can rotate relative to the base 300. The first locking mechanism 400 and the second locking mechanism 500 are unlocked in conjunction. After both the first locking mechanism 400 and the second locking mechanism 500 are unlocked, the pedal 100 is pulled, causing it to rotate relative to the first end 220. The first synchronous wheel 810 rotates synchronously with the pedal 100. Through the power transmission of the transmission member 820, the third synchronous wheel 920 synchronously drives the second synchronous wheel 910 to rotate, causing the second end 230 to rotate relative to the base 300. The pedal 100 and the articulated arm 200 are deployed synchronously. After the pedal 100 and the articulated arm 200 are fully unfolded, the first guide groove 121 is aligned with the second guide groove 221, the elastic force of the first elastic member 430 is released, and the first guide protrusion 423 moves toward the second guide groove 221 under the elastic force of the first elastic member 430. After the first guide protrusion 423 exits from the first guide groove 121 and enters the second guide groove 221, the first locking mechanism 400 is again in a locked state, and the position of the pedal 100 is locked; similarly, after the articulated arm 200 is fully unfolded, the third guide groove 311 is aligned with the fourth guide groove 231, the elastic force of the second elastic member 530 is released, and the second guide protrusion 522 moves toward the third guide groove 311 under the elastic force of the second elastic member 530. After the second guide protrusion 522 exits from the fourth guide groove 231 and enters the third guide groove 311, the second locking mechanism 500 is again in a locked state, and the position of the articulated arm 200 is locked, so that the pedal structure continues to remain in the unfolded state.When the pedal structure needs to be folded, the unlocking mechanism 600 is unlocked again. After the first locking mechanism 400 and the second locking mechanism 500 are unlocked, the pedal 100 is pushed to fold, and the articulated arm 200 folds synchronously with the pedal 100. After folding into place, the first locking mechanism 400 and the second locking mechanism 500 are locked again to keep the pedal structure in a folded state.

[0100] The present invention also provides a seat comprising the aforementioned footrest structure and a seat chassis, wherein the base 300 is mounted at the bottom of the seat chassis. When the footrest structure is unfolded, the footrest 100 can support the user's legs and feet. When the footrest structure is folded, it can be stored at the bottom of the seat chassis.

[0101] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. The pedal structure with linked retraction and extension is characterized by: include: pedals; base; The articulated arm comprises a joint portion and a first end portion and a second end portion respectively connected to both ends of the joint portion, wherein the first end portion is connected to the pedal by rotating around a first direction, and the second end portion is connected to the base by rotating around the first direction; a first locking mechanism partially accommodated in the first end portion, the first locking mechanism comprising a first locking tooth and a second locking tooth slidably connected along a first direction, and a first elastic member respectively abutting against the second locking tooth and the pedal along the first direction; an unlocking mechanism comprising a linkage cable, one end of which is connected to a first locking tooth and is capable of pulling the first locking tooth to rotate, causing the first locking tooth to push the second locking tooth to move, thereby releasing the lock on the first end portion from the second locking tooth, and the second locking tooth being capable of moving in the opposite direction under the elastic force of the first elastic member and restoring the lock on the first end portion; a second locking mechanism partially accommodated in the second end portion, the second locking mechanism comprising a third locking tooth and a fourth locking tooth slidably connected along the first direction, and a second elastic member respectively abutting against the fourth locking tooth and the second end portion along the first direction; a linkage mechanism housed in the joint portion, one end of the linkage mechanism being connected to the first locking mechanism, and the other end being connected to the third locking tooth; the linkage mechanism being capable of pulling the third locking tooth to rotate in response to the rotation of the first locking tooth, so that the third locking tooth pushes the fourth locking tooth to move, thereby releasing the locking of the base by the fourth locking tooth; and the fourth locking tooth being capable of moving in the opposite direction under the elastic force of the second elastic member, thereby resuming the locking of the base; A first synchronization mechanism includes a first synchronization wheel accommodated in the first end portion, and a transmission member located in the joint portion, the first synchronization wheel is connected to the pedal, and the transmission member is transmission-connected to the first synchronization wheel; The second synchronization mechanism is accommodated in the second end portion. The second synchronization mechanism includes a second synchronization wheel. The second synchronization wheel is in transmission connection with the transmission member. The second synchronization wheel is connected to the base.

2. The linked retractable and extendable pedal structure according to claim 1, characterized in that: The unlocking mechanism further includes a pushing member, one end of the linkage cable away from the first locking tooth is connected to the pushing member, and the pushing member is slidably connected to the pedal.

3. The linked retractable and extendable pedal structure according to claim 1, characterized in that: The linkage mechanism includes a first linkage rod, a second linkage rod and a connecting cable, one end of the first linkage rod is connected to the second locking tooth, and the other end abuts against one end of the second linkage rod, the other end of the second linkage rod is connected to one end of the connecting cable, the other end of the connecting cable is connected to the third locking tooth, and the second linkage rod is rotatably connected to the joint portion; The first linkage rod can move toward the second locking mechanism following the movement of the second locking tooth, so that the second linkage rod pulls the connecting rope and rotates the third locking tooth.

4. The linked retractable and extendable pedal structure according to claim 1, characterized in that: The first locking tooth includes a first pushing tooth protruding toward the second locking tooth, the first pushing tooth having an inclined first guide slope, and the first guide slope abuts against the second locking tooth along the first direction; The third locking tooth includes a second pushing tooth protruding toward the fourth locking tooth, the second pushing tooth has an inclined second guide slope, and the second guide slope abuts against the fourth locking tooth along the first direction.

5. The linked retractable and extendable pedal structure according to claim 4, characterized in that: The first locking tooth includes a first body and a first connecting portion, the first connecting portion is connected to the linkage cable, the first connecting portion and the first pushing tooth are both connected to a side of the first body facing the second locking tooth, a side portion of the second locking tooth is provided with a first limiting groove, a portion of the first body is accommodated in the first limiting groove, and the first limiting groove can limit the rotation angle of the first locking tooth; The third locking tooth includes a second body and a second connecting part, the second connecting part is connected to the linkage mechanism, the second connecting part and the second pushing tooth are both connected to the side of the second body facing the fourth locking tooth, and the side of the fourth locking tooth is provided with a second limiting groove, the second connecting part is accommodated in the second limiting groove, and the second limiting groove can limit the rotation angle of the fourth locking tooth.

6. The linked retractable and extendable pedal structure according to claim 1, characterized in that: The pedal includes a first mounting portion, the first mounting portion being rotatably connected to the first end portion, a first guide groove extending in a first direction being provided inside the first mounting portion, a second guide groove extending in the first direction being provided inside the first end portion, a first guide protrusion being provided on a side of the second locking tooth, the first guide protrusion being capable of being inserted into the first guide groove and exiting the second guide groove, or being inserted into the second guide groove and exiting the first guide groove; The base includes a second mounting portion, which is rotatably connected to the second end portion, a third guide groove extending along the first direction is provided inside the second mounting portion, a fourth guide groove extending along the first direction is provided inside the second end portion, and a second guide protrusion is provided on the side of the fourth locking tooth, and the second guide protrusion can be inserted into the third guide groove and exit from the fourth guide groove, or inserted into the third guide groove and exit from the third guide groove.

7. The linked retractable and extendable pedal structure according to claim 6, characterized in that: The second end portion is rotatably connected to the base via a transmission shaft, the second synchronous wheel is rotatably connected to the transmission shaft, a rotating shaft extending along the first direction is provided inside the second end portion, the rotating shaft is spaced apart from the transmission shaft, the second synchronous wheel has a first arc-shaped groove penetrating along the first direction, the rotating shaft is passed through the first arc-shaped groove, and the first arc-shaped groove is used to limit the rotation angle of the second synchronous wheel so that the second guide protrusion can be aligned with and inserted into the third guide groove or the fourth guide groove.

8. The linked retractable and extendable pedal structure according to claim 7, characterized in that: The second synchronization mechanism also includes a third synchronization wheel, the rotating shaft is provided in the third synchronization wheel and is rotationally connected to the third synchronization wheel, the third synchronization wheel is engaged with the inside of the second synchronization wheel, the third synchronization wheel rotates synchronously with the first synchronization wheel through the transmission member, the third synchronization wheel is provided with a second arc groove penetrating along the first direction, the transmission shaft is provided in the second arc groove, the second arc groove is used to limit the rotation angle of the third synchronization wheel, and the rotation angle of the second synchronization wheel is smaller than the rotation angle of the third synchronization wheel.

9. The linked retractable and extendable pedal structure according to claim 1, characterized in that: The first synchronous wheel and the first locking mechanism are distributed along a first direction. The pedal includes a rotating portion, which extends along the first direction and is inserted into the first end portion. The first locking tooth and the second locking tooth are arranged around the outside of the rotating portion. The rotating portion is connected to the first synchronous wheel and can drive the first synchronous wheel to rotate.

10. A seat, characterized in that include: The linked retractable and extendable pedal structure according to any one of claims 1 to 9; A seat chassis is provided, wherein the base is mounted on the seat chassis.

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