Pedal pull rod limiting structure

Abstract

The pedal pull rod limiting structure comprises a pedal plate and pull rods rotationally connected to the left side and the right side of the pedal plate, each pull rod comprises a pipe body with the tubular rear side, and a connecting cavity is formed in each pipe body; a limiting mechanism is arranged on the pipe body, the limiting mechanism comprises a limiting carrier and a limiting unit, the limiting carrier is clamped to the rear side of the pipe body through a connecting cavity, the limiting carrier is in interference fit with the pipe body, and the limiting carrier is configured to be assembled and disassembled on a connecting seat of the chair seat together with the drawing rod; the limiting unit is detachably or movably connected to the limiting carrier, and the limiting unit is configured to avoid or stop the connecting base. According to the pedal pull rod limiting structure, the limiting carrier and the pipe body are in interference fit, installation is convenient, and assembling and disassembling of the pull rod cannot be affected; the limiting unit is installed or movably adjusted to be stopped at the rear end of the connecting base, the drawing rod is effectively prevented from falling off from the connecting base, and stability is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to a chair technology field, concretely relates to a foot pedal pull rod limiting structure. BACKGROUND

[0002] With the improvement of life quality, people's demand for chairs is no longer limited to providing sitting, and the demand for chair comfort is increasing day by day. For example, the existing office chair, in order to enable the staff to lie down and rest during the rest time, in addition to the chair back can be turned over, a foot rest plate is slidably connected at the bottom of the seat, which can be pulled out when needed, so that the user's leg can be supported, and the user can rest in a comfortable lying position, effectively relieving fatigue.

[0003] Most of the existing office chair's foot rest plate is rotatably connected with a pull rod on both sides, and the bottom of the seat is provided with a sleeve-shaped connecting seat, which is sleeved with the pull rod, so as to realize the forward and backward sliding of the foot rest plate relative to the seat. A ring-shaped connecting groove is recessed on the side wall of the end of the pull rod, and a rubber ring is sleeved on the connecting groove. When the pull rod slides to the maximum distance, the rubber ring abuts against the rear end of the connecting seat by means of its own damping, so as to limit the sliding distance of the pull rod and avoid the foot rest plate from being separated from the seat.

[0004] However, it is difficult to limit the pull rod reliably only by the damping of the rubber ring. After the pull rod is subjected to a larger pulling force, the rubber ring may be deformed, causing the pull rod to fall off the connecting seat, and the stability is poor. SUMMARY

[0005] In view of the above defects or deficiencies in the prior art, it is desirable to provide a foot pedal pull rod limiting structure. The limiting carrier and the pipe body are in interference fit, so that the limiting carrier is easy to install, and after installation, the limiting carrier can be installed and removed together with the pull rod on the connecting seat of the seat, without affecting the installation and removal of the pull rod. When it is necessary to limit the sliding distance of the pull rod, only the limiting unit needs to be installed or adjusted, which is stopped at the rear end of the connecting seat, effectively preventing the pull rod from falling off the connecting seat, and the stability is good.

[0006] The effect of the utility model is realized as follows:

[0007] The application provides a foot pedal pull rod limiting structure, which comprises a foot pedal and a pull rod rotatably connected to the left and right sides of the foot pedal. The pull rod comprises a rear pipe-shaped pipe body, and a connecting cavity is formed in the pipe body. A limiting mechanism is arranged on the pipe body, which comprises a limiting carrier and a limiting unit. The limiting carrier is connected to the rear side of the pipe body through the connecting cavity, and the limiting carrier and the pipe body are in interference fit. The limiting carrier is configured to be installed and removed together with the pull rod on the connecting seat of the seat. The limiting unit is detachably or movably connected to the limiting carrier, and the limiting unit is configured to avoid or stop the connecting seat.

[0008] Further, the limiting carrier is a mounting piece, the limiting unit is a knob screw, the mounting piece is provided with an internally threaded hole, the knob screw comprises a screw cap part and a screw rod part with external threads, the screw rod part is screwed to the mounting piece through the internally threaded hole, and the diameter of the screw cap part is larger than the pipe body. The screw cap part of the knob screw is larger, so as to stably abut against the rear end of the connecting seat, and the stability is good. Moreover, the knob screw is screwed to the mounting piece, which not only has a simple structure, but also makes the connecting strength between the knob screw and the pull rod higher, and the knob screw is convenient to install and disassemble.

[0009] Further, the mounting piece is a knurled nut. The knurled nut not only has low cost, but also has an interference fit with the pipe body, so that the knurled nut can be pressed into the connecting cavity by means of an oil press during production, and the installation operation is more convenient.

[0010] Further, the limiting carrier and the limiting unit can also have other connecting structures, for example: the limiting carrier is a limiting piece, the limiting unit is a clamp head, the limiting piece is provided with an accommodating hole in the radial direction, and the clamp head is movably connected to the limiting piece through the accommodating hole.

[0011] The limiting piece has a locked state and an unlocked state. In the locked state, the clamp head penetrates through the accommodating hole and is exposed to the limiting piece, and the outer end of the clamp head exceeds the side wall of the pipe body in the radial direction. In the unlocked state, the clamp head is entirely retracted into the accommodating hole. The limiting piece not only does not easily affect the installation or sliding operation of the pull rod, but also has good practicability, and the adjustment operation of the limiting piece is more convenient.

[0012] Further, an elastic member is arranged in the accommodating hole, and the elastic member acts on the clamp head, so that the clamp head always has a tendency to be pushed out. This makes the state switching operation of the limiting piece more convenient.

[0013] Further, the accommodating hole is provided through the limiting piece, two clamp heads symmetrically arranged in front of and behind the accommodating hole are arranged in the accommodating hole, and the two clamp heads are connected through an elastic member. The sliding distance of the pull rod is limited by the two clamp heads, the stability is better, and the adjustment operation is more convenient.

[0014] Further, a stop assembly is movably connected to the side wall of the limiting piece. In the locked state, the stop assembly avoids the accommodating hole. In the unlocked state, the stop assembly blocks the accommodating hole, so as to avoid the clamp head from being separated from the accommodating hole. By blocking the accommodating hole through the stop assembly, the stability is better, and the clamp head can be automatically popped out by means of the elastic member only by moving the stop assembly to avoid the accommodating hole, so as to further improve the convenience of the adjustment operation.

[0015] Further, the stop component comprises a ring-shaped collar, the collar is sleeved on the limiting member and can rotate around the circumference of the limiting member, and a through hole is formed in the collar in a radial direction; in the locked state, the collar is rotated to the through hole to be opposite to the accommodating hole, the clamping head passes through the through hole and is exposed outside the collar; in the unlocked state, the collar is rotated to the through hole to deviate from the accommodating hole, so that the inner wall of the collar blocks the accommodating hole, and the clamping head cannot pass out of the accommodating hole. Not only in the unlocked state, the collar blocks the accommodating hole, so that the clamping head can be stably clamped in the accommodating hole, and only by rotating the collar to the through hole to be opposite to the accommodating hole, the clamping head can be automatically ejected from the accommodating hole and the through hole under the elastic force of the elastic member, thereby further improving the convenience of the adjusting operation of the limiting member.

[0016] Further, the clamping head comprises a limiting portion and a sliding portion, the diameter of the limiting portion is smaller than that of the sliding portion, the diameter of the through hole is close to that of the limiting portion, and the diameter of the accommodating hole is close to that of the sliding portion. So that the clamping head cannot be separated from the collar, and is stably clamped in the accommodating hole, and the stability is good.

[0017] Further, a ring-shaped positioning groove is recessed on the side wall of the limiting member, and the collar is sleeved on the limiting member through the positioning groove. So that the limiting member and the collar are relatively fixed in the axial direction, so that the connection strength between the two is higher, and the stability is better.

[0018] Further, the outer end surface of the clamping head is an arc surface. Further improve the convenience of the adjusting operation of the limiting member.

[0019] Further, the collar is made of metal.

[0020] The foot pedal pull rod limiting structure provided by the application is provided, the limiting carrier and the pipe body are in interference fit, so that the limiting carrier is convenient to install, and after the limiting carrier is installed, the limiting carrier can be installed and dismounted on the connecting seat of the chair seat together with the pull rod, and does not affect the installation and dismounting of the pull rod; when the sliding pipe distance of the pull rod needs to be limited, only the limiting unit needs to be installed or moved to adjust, and when the maximum distance of the sliding path of the pull rod is reached, the limiting unit is stopped at the rear end of the connecting seat, so that the pull rod is effectively prevented from falling off the connecting seat, and the stability is good. BRIEF DESCRIPTION OF DRAWINGS

[0021] Other characteristics, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings:

[0022] Figure 1 A perspective structural schematic view of the foot pedal pull rod limiting structure provided by the embodiment of the application is provided;

[0023] Figure 2 A perspective structural schematic view of the foot pedal pull rod limiting structure when the foot pedal is turned forward is provided;

[0024] Figure 3The connection structure between the pedal-pulling rod limiting structure and the chair seat provided by the embodiment of the application is shown in the schematic view.

[0025] Figure 4 The connection structure between the knob nut and the pulling rod provided by the embodiment of the application is shown in the schematic view.

[0026] Figure 5 The cross-sectional structure of the pedal-pulling rod limiting structure provided by the embodiment of the application is shown in the schematic view.

[0027] Figure 6 The three-dimensional structure of the limiting member provided by the embodiment of the application is shown in the schematic view.

[0028] Figure 7 The connection structure between the limiting member and the pulling rod provided by the embodiment of the application is shown in the schematic view.

[0029] Figure 8 The change process of the limiting member when switching states is shown in the schematic view.

[0030] Figure 9 The connection structure between the pedal-pulling rod limiting structure and the chair seat in the unlocked state provided by the embodiment of the application is shown in the schematic view.

[0031] Figure 10 The connection structure between the pedal-pulling rod limiting structure and the chair seat in the locked state provided by the embodiment of the application is shown in the schematic view.

[0032] The reference signs are as follows: 1-pedal, 2-pulling rod, 210-tube body, 211-connection cavity, 4-knob screw, 3-mounting member, 301-internal threaded hole, 410-nut part, 420-screw part, 5-limiting member, 501- accommodating hole, 502-elastic member, 503-positioning groove, 510-sleeve ring, 511-through hole, 6-clamp head, 610-limiting part, 620-sliding part, 7-chair seat, 710-connection seat. DETAILED DESCRIPTION

[0033] The application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model, and are not a limitation on the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings.

[0034] Please refer to the drawings Figures 1-10The utility model provides a pedal pull rod limiting structure, including footboard 1 and the pull rod 2 of rotation connection in the left and right sides of footboard 1, and the pull rod 2 includes the tubular body 210 of rear side pipe, and the connecting cavity 211 is formed in the inside of tubular body 210, the limiting mechanism is arranged on the tubular body 210, and the limiting mechanism includes limiting carrier and limiting unit, limiting carrier is clamped on the rear side of tubular body 210 through connecting cavity 211, and limiting carrier and tubular body 210 are interference fit, and limiting carrier is configured with pull rod 2 and is loaded and unloaded in the connecting seat 710 of chair seat 7, limiting unit is detachably or movably connected to limiting carrier, and limiting unit is configured to avoid or stop the connecting seat 710.

[0035] In the embodiment, the limiting carrier and the tubular body 210 are interference fit, so that the limiting carrier is easy to install, and the limiting carrier can be installed and removed together with the pull rod 2 on the connecting seat 710 of the chair seat 7 after installation, without affecting the installation and removal of the pull rod 2; when it is necessary to limit the sliding tube distance of the pull rod 2, only the limiting unit needs to be installed or adjusted, and when the pull rod 2 slides to the maximum distance, the limiting unit stops at the rear end of the connecting seat, effectively preventing the pull rod 2 from falling off the connecting seat 710, and the stability is good.

[0036] Please refer to the attached drawings Figures 3-5 In some embodiments of the application, the limiting carrier is a mounting piece 3, and the limiting unit is a knob screw 4, the mounting piece 3 is provided with an internal threaded hole 301, the knob screw 4 includes a screw cap portion 410 and a screw rod portion 420 with external threads, the screw rod portion 420 is screwed to the mounting piece 3 through the internal threaded hole 301, and the diameter of the screw cap portion 410 is larger than that of the tubular body 210.

[0037] In the embodiment, the knob screw 4 is connected to the rear side of the pull rod 2, and the screw cap portion 410 of the knob screw 4 is larger, so as to stably abut against the rear end of the connecting seat 710, preventing the pull rod 2 from falling off the chair seat 7, and the stability is good. Moreover, the mounting piece 3 is embedded at the rear end of the tubular body 210, and the knob screw 4 is screwed to the mounting piece 3, which not only has a simple structure, but also has high connection strength between the knob screw 4 and the pull rod 2, and the knob screw 4 is easy to install and remove.

[0038] When it is necessary to install the footboard 1 to the chair seat 7, the knob screw 4 is unscrewed from the pull rod 2, so that the pull rod 2 can smoothly pass through the connecting seat 710, and then the knob screw 4 is screwed into the mounting piece 3, so that the screw cap portion 410 of the knob screw 4 can abut against the rear end of the connecting seat 4 after the pull rod 2 slides forward to the maximum distance, preventing the pull rod 2 from falling off.

[0039] The pull rod 2 further comprises a front connecting sleeve 220 rotatably connected to the left and right sides of the foot plate 1, and the connecting sleeve 220 and the foot plate 1 are fixed relative to each other in the axial direction, and the stability is good. The connecting sleeve 220 is sleeved on the pipe body 210, and the connecting sleeve 220 and the pipe body 210 are fixed by a screw penetrating in the radial direction, and the assembly is convenient.

[0040] Please refer to the accompanying drawings Figures 4-5 In some embodiments of the present application, the mounting member 3 is preferably a knurled nut. The knurled nut is not only low in cost, but also has an interference fit with the pipe body 210, which can be pressed into the connecting cavity 211 by means of an oil press during production, and the installation operation is convenient.

[0041] Please refer to the accompanying drawings Figures 6-10 In some embodiments of the present application, the limiting carrier and the limiting unit can also have other connection structures, for example, the limiting carrier is a limiting member 5, and the limiting unit is a clamping head 6, and the limiting member 5 is provided with a containing hole 501 in the radial direction, and the clamping head 6 is movably connected to the limiting member 5 through the containing hole 501.

[0042] The limiting member 5 has a locked state and an unlocked state. In the locked state, the clamping head 6 penetrates through the containing hole 501 and is exposed to the limiting member 5, and the outer end of the clamping head 6 exceeds the side wall of the pipe body 210 in the radial direction. In the unlocked state, the clamping head 6 is entirely retracted into the containing hole 501.

[0043] In the present embodiment, the bottom space of part of the seat is relatively compact, that is, the gap between the pull rod 2 after installation and the bottom of the seat 7 is small. If a knob nut 4 with a larger diameter is used, it may be difficult to install the knob nut 4, or it may affect the sliding adjustment of the pull rod 2. Therefore, by embedding a limiting member 5 with a diameter not greater than that of the pipe body 210 on the rear side of the pipe body 210, the limiting member 5 is not easy to affect the sliding adjustment of the pull rod 2 after installation. Furthermore, the limiting member 5 movably connects the clamping head 6, and when the foot plate 1 needs to be installed to the seat 7, the clamping head 6 is first pressed into the containing hole 501, the limiting member 5 enters the unlocked state, and the pull rod 2 can freely penetrate into the connecting seat 710. After the pull rod 2 enters the connecting seat 710, the clamping head 6 is adjusted to move outward, the limiting member 5 enters the locked state, and the clamping head 6 exceeds the pipe body 210 in the radial direction, so that after the pull rod 2 slides to the maximum distance, the clamping head 6 can abut against the rear end of the connecting seat 7, avoiding the pull rod 2 from being separated from the seat 7. Therefore, even in the case of limited space, the limiting member 5 not only does not easily affect the installation or sliding operation of the pull rod 2, but also has good practicability, and the adjustment operation of the limiting member 5 is relatively simple.

[0044] Please refer to the accompanying drawings Figures 7-8 In some embodiments of the present application, the containing hole 501 is provided with an elastic member 502, and the elastic member 502 acts on the clamping head 6, so that the clamping head 6 always has a tendency to be pushed outward.

[0045] In the embodiment, by arranging the elastic member 502, in the locked state, the clamping head 6 is located in the accommodating hole 501 and presses the elastic member 502. When it is needed to switch the limiting piece 5 from the locked state to the unlocked state, the user only needs to release the clamping head 6, and the clamping head 6 can automatically pop out under the elastic force of the elastic member 502, so that the state switching operation of the limiting piece 5 is more convenient.

[0046] Please refer to the accompanying drawings Figures 7-8 In some embodiments of the present application, the accommodating hole 501 is arranged through the limiting piece 5, two clamping heads 6 symmetrical to each other are arranged in the accommodating hole 501, and the two clamping heads 6 are connected by the elastic member 502.

[0047] In the embodiment, the sliding distance of the pull rod 2 is limited by the two clamping heads 6, the stability is better, and the two clamping heads 6 are connected by the same elastic member 502, that is, the elastic force of the elastic member 502 can stably act on the clamping heads 6 on both sides, and the adjustment operation is relatively simple.

[0048] Preferably, the elastic member 502 is a spring, which has good elasticity and is convenient to install. Of course, in other embodiments of the present application, the elastic member 502 can also be rubber, a spring piece or the like.

[0049] Please refer to the accompanying drawings Figures 7-8 In some embodiments of the present application, a stop component is movably connected to the side wall of the limiting piece 5. In the locked state, the stop component avoids the accommodating hole 501. In the unlocked state, the stop component blocks the accommodating hole 501, so that the clamping head 6 cannot be separated from the accommodating hole 501. By arranging the stop component to block the accommodating hole 501, the clamping head 6 is not easy to separate from the accommodating hole 501 in the unlocked state, and the stability is better. When it is needed to switch to the unlocked state, the stop component only needs to be moved away from the accommodating hole 501, and the clamping head 6 can automatically pop out by the elastic member 502, so as to further improve the convenience of the adjustment operation.

[0050] Please refer to the accompanying drawings Figures 7-8 In some embodiments of the present application, the stop component includes a ring-shaped sleeve 510, the sleeve 510 is sleeved on the limiting piece 5 and can rotate around the circumference of the limiting piece 5, and a through hole 511 is arranged on the sleeve 510 in a radial direction. In the locked state, the sleeve 510 is rotated to the through hole 511 opposite the accommodating hole 501, the clamping head 6 passes through the through hole 511 and is exposed outside the sleeve 510. In the unlocked state, the sleeve 510 is rotated to the through hole 511 deviating from the accommodating hole 501, so that the inner wall of the sleeve 510 blocks the accommodating hole 501, and the clamping head 6 cannot pass out of the accommodating hole 501.

[0051] In the embodiment, through the sleeve ring 510, not only in the unlocked state, the sleeve ring 510 blocks the accommodating hole 501, so that the clamping head 6 can be stably clamped into the accommodating hole 501, and the stability is better, and when the limiting piece 5 needs to be converted to the locked state, only the sleeve ring 510 needs to be rotated to the through hole 511 to the accommodating hole 501, and the clamping head 6 can be automatically ejected from the accommodating hole 501 and the through hole 511 under the elastic force of the elastic piece 502, thereby further improving the convenience of the adjusting operation of the limiting piece 5.

[0052] Please refer to the accompanying drawings Figure 8 In some embodiments of the present application, the clamping head 6 includes a limiting portion 610 and a sliding portion 620, the diameter of the limiting portion 610 is smaller than that of the sliding portion 620, the hole diameter of the through hole 511 is close to the diameter of the limiting portion 610, and the hole diameter of the accommodating hole 501 is close to the diameter of the sliding portion 620.

[0053] In the embodiment, by setting the clamping head 6 as a stepped structure, in the locked state, the smaller diameter limiting portion 610 can pass through the through hole 511 to limit the sliding distance of the pull rod 2, and the larger diameter sliding portion 620 cannot pass through the through hole 511, so that the clamping head 6 cannot be separated from the sleeve ring 510, and is stably clamped in the accommodating hole 501, and the stability is better.

[0054] Please refer to the accompanying drawings Figure 7 In some embodiments of the present application, a ring-shaped positioning groove 503 is recessed on the side wall of the limiting piece 5, and the sleeve ring 510 is sleeved on the limiting piece 5 through the positioning groove 503. The limiting piece 5 and the sleeve ring 510 are relatively fixed in the axial direction, so that the connection strength between the two is higher, and the stability is better.

[0055] Please refer to the accompanying drawings Figure 8 In some embodiments of the present application, the outer end surface of the clamping head 6 is an arc surface. When the limiting piece 5 is switched from the locked state back to the unlocked state, the user presses the clamping head 6 inward and rotates the sleeve ring 510, along the arc surface of the clamping head 6, the clamping head 6 will automatically retract into the accommodating hole 501 after being extruded by the sleeve ring 510, thereby further improving the convenience of the adjusting operation of the limiting piece 5.

[0056] In some embodiments of the present application, the sleeve ring 510 is made of metal.

[0057] It should be understood that the above-mentioned terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is more than three.

[0058] The above description is only the preferred embodiment of the present application and the explanation of the technical principles applied. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the technical solutions formed by mutually replacing the above-mentioned features and the technical features disclosed in the present application (but not limited to) with similar functions.

Claims

1. A pedal-pull lever limiting structure, characterized in that, The utility model provides a chair's footrest and the connecting structure of pull rod, including footrest (1) and the pull rod (2) of rotation connection in the left and right sides of footrest (1), the pull rod (2) includes rear side tubular pipe body (210), and the connecting cavity (211) is formed in the inside of pipe body (210), the limiting mechanism is arranged on the pipe body (210), and the limiting mechanism includes limiting carrier and limiting unit, the limiting carrier is connected through the connecting cavity (211) in the rear side of pipe body (210), and the limiting carrier and pipe body (210) are interference fit, the limiting carrier is configured with the pull rod (2) and is loaded and unloaded in the connecting seat (710) of chair seat (7), the limiting unit is detachably or movably connected to the limiting carrier, and the limiting unit is configured to avoid or stop the connecting seat (710).

2. The pedal-pulldraw rod limiting structure according to claim 1, wherein The limiting carrier is a mounting piece (3), the limiting unit is a knob screw (4), the mounting piece (3) is provided with an internal thread hole (301), the knob screw (4) includes a screw cap part (410) and a screw rod part (420) with external threads, the screw rod part (420) is screwed to the mounting piece (3) through the internal thread hole (301), and the diameter of the screw cap part (410) is greater than that of the pipe body (210).

3. The pedal-pulldraw rod limiting structure according to claim 2, wherein The mounting piece (3) is a knurled nut.

4. The pedal-pulldraw rod limiting structure according to claim 1, wherein The limiting carrier is a limiting piece (5), the limiting unit is a clamp head (6), the limiting piece (5) is provided with a containing hole (501) in the radial direction, and the clamp head (6) is movably connected to the limiting piece (5) through the containing hole (501). The limiting piece (5) has a locked state and an unlocked state, in the locked state, the clamp head (6) penetrates through the containing hole (501) and is exposed to the limiting piece (5), and the outer end of the clamp head (6) exceeds the side wall of the pipe body (210) in the radial direction; in the unlocked state, the clamp head (6) is entirely retracted into the containing hole (501).

5. The foot-pedal pull rod limiting structure according to claim 4, wherein The containing hole (501) is provided with an elastic member (502) inside, and the elastic member (502) acts on the clamp head (6), so that the clamp head (6) always has a tendency to be pushed outwards.

6. The footrest-pull rod position limiting structure according to claim 5, wherein The containing hole (501) is provided through the limiting piece (5), two clamp heads (6) are provided in the containing hole (501) and are symmetrical in front and back, and the two clamp heads (6) are connected through the elastic member (502).

7. The pedal-pulldraw rod limiting structure according to claim 4, wherein The side wall of the limiting piece (5) is movably connected with a stop component, in the locked state, the stop component avoids the containing hole (501); in the unlocked state, the stop component blocks the containing hole (501), so that the clamp head (6) is prevented from being separated from the containing hole (501).

8. The footrest-pull rod position limiting structure according to claim 7, wherein The stop component comprises a ring-shaped collar (510) sleeved on the limiting member (5) and rotatable around the circumference of the limiting member (5), and a through hole (511) is radially hollowed out on the collar (510); in the locked state, the collar (510) is rotated to the through hole (511) opposite to the accommodating hole (501), and the clamping head (6) passes through the through hole (511) and is exposed outside the collar (510); in the unlocked state, the collar (510) is rotated to the through hole (511) deviated from the accommodating hole (501), so that the inner wall of the collar (510) blocks the accommodating hole (501), and the clamping head (6) cannot pass out of the accommodating hole (501).

9. The footrest-pull rod position limiting structure according to claim 8, wherein The clamping head (6) comprises a limiting portion (610) and a sliding portion (620), the diameter of the limiting portion (610) is smaller than that of the sliding portion (620), the hole diameter of the through hole (511) is similar to the diameter of the limiting portion (610), and the hole diameter of the accommodating hole (501) is similar to the diameter of the sliding portion (620).

10. The footrest-pull rod position limiting structure according to claim 8, wherein A ring-shaped positioning groove (503) is recessed on the side wall of the limiting member (5), and the collar (510) is sleeved on the limiting member (5) through the positioning groove (503).

11. The footrest-pull rod position limiting structure according to claim 8, wherein The outer end surface of the clamping head (6) is an arc surface.

12. The footrest-pull rod position limiting structure according to claim 10, wherein The collar (510) is made of metal.

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