Side arm folding limiting structure and treadmill

Abstract

The utility model discloses a kind of side handrail folding limiting structures, including base and rotatingly connected on the base handrail, limit plate is set on base, different positions of limit plate are provided with connecting hole, and each connecting hole is located on the arc with the rotating center of handrail as center;Handrail is provided with spanner, pin and pin shaft, the axis of pin is perpendicular to limit plate, and can be inserted into limiting hole to realize the locking of handrail, pin shaft is connected in the lateral of pin, spanner is rotatably connected on handrail, and the first end of spanner is connected with pin shaft, second end extends in the direction away from base, the second end of spanner can make the first end of spanner drive pin shaft, and pin is pulled out from connecting hole by pin shaft to make handrail rotatable on base.The utility model is locked by pin and limiting hole connection to realize handrail, and it is unlocked by controlling the movement of pin shaft to control pin to pull out limiting hole, and its structure is simple and reliable and easy to operate.

Description

Technical Field

[0001] This utility model relates to the field of fitness equipment, and in particular to a side armrest folding limiting structure and a treadmill. Background Technology

[0002] Based on the current market conditions and public demand for exercise equipment, handrails, especially those on treadmills, are generally non-foldable. However, user surveys show that different users have different requirements for treadmill handrails. Some users want handrails for easy gripping during rest, while others prefer handrails that fold during exercise to avoid collisions. Foldable handrails are particularly important for small home treadmills.

[0003] The folding handrails in existing technologies involve a rather cumbersome folding process, which makes it difficult for users to quickly fold the handrails during exercise, thus reducing the user experience. Utility Model Content

[0004] The purpose of this utility model is to provide a side armrest folding limiting structure to solve the problem that the folding process of the armrest in the prior art is relatively cumbersome, which is not conducive to users quickly folding the armrest during exercise. The specific technical solution is as follows:

[0005] A side armrest folding and limiting structure includes a base and an armrest rotatably connected to the base. A limiting plate is provided on the base, and the limiting plate is parallel to the rotation plane of the armrest. Connecting holes are provided at different positions on the limiting plate, and each connecting hole is located on an arc with the rotation center of the armrest as the center. A wrench, a pin, and a pin shaft are provided on the armrest. The axis of the pin is perpendicular to the limiting plate and can be inserted into the limiting hole to lock the armrest. The pin shaft is connected to the pin on the side of the pin. The wrench is rotatably connected to the armrest, and the first end of the wrench is connected to the pin shaft, while the second end extends away from the base. Moving the second end of the wrench can move the first end away from the limiting plate and drive the pin to move with the pin shaft to be pulled out of the connecting hole, so that the armrest can rotate on the base.

[0006] Furthermore, the wrench includes a first connecting plate and a second connecting plate connected at a preset first angle. The connection point of the first connecting plate and the second connecting plate is rotatably connected to the handrail. One end of the first connecting plate is connected to a pin, and one end of the second connecting plate extends away from the base. When the handrail is locked, there is a toggle distance between the second connecting plate and the handrail. When the second connecting plate is rotated around the connection point and moves closer to the handrail, the first connecting plate can be rotated in the opposite direction to drive the pin to move along the axial direction of the pin.

[0007] Furthermore, the pin is inserted into the handrail from the first side of the handrail. A first groove is provided on the second side of the handrail. A first connecting plate is arranged parallel to the second side of the handrail. A second groove is provided on the first connecting plate. The second groove and the first groove are arranged to intersect each other. The pin is inserted into both the second groove and the first groove and connected to the pin. When the second connecting plate is moved, the pin can move under the limitation of the first groove and the second groove.

[0008] Furthermore, the first groove is a straight groove arranged along the axial direction of the pin, and the second groove is a straight groove arranged along the transverse direction of the pin. The width of both the first groove and the second groove is slightly larger than the pin. When the second connecting plate rotates around the connection point, the second groove rotates around the connection point and drives the pin to slide on the first groove.

[0009] Furthermore, the first slide groove includes a longitudinal groove and a transverse groove connected to each other. The transverse groove includes a semi-circular groove and an arc-shaped transition section connected to the longitudinal groove. The semi-circular groove of the transverse groove is clearance-fitted with the pin. The width of the longitudinal groove is greater than the diameter of the pin. The second slide groove is a locking groove and a sliding groove connected at a preset second angle. The locking groove includes a semi-circular groove and an arc-shaped transition section connected to the sliding groove. When the pin is in the locked state, the locking groove is perpendicular to the transverse groove and restricts the pin to the locked state. When the second connecting plate rotates around the connection point, the locking groove moves downward, causing the sliding groove to gradually approach the pin. Then, driven by the sliding groove, the pin enters the longitudinal groove and moves to the bottom of the longitudinal groove under the restriction of the longitudinal groove and the sliding groove.

[0010] Furthermore, the first side of the handrail is also provided with a transverse groove, in which the pin can move back and forth, so that the pin moves closer to or further away from the limiting plate in the transverse direction.

[0011] Furthermore, the connecting hole is located at the edge of the limiting plate, so that the side of the connecting hole facing the limiting plate has an arc-shaped structure that matches the outer diameter of the pin, and the side of the connecting hole away from the limiting plate also includes a parallel opening to provide space for the pin to move laterally.

[0012] Furthermore, the handrail is also equipped with an elastic element, which provides elastic force for the pin to insert into the connecting hole, so that the handrail remains in the locked state.

[0013] Furthermore, the connecting holes include a first connecting hole and a second connecting hole with a right angle at the center. When the pin is connected to the first connecting hole, the handrail is in an unfolded state. When the pin is connected to the second connecting hole, the handrail rotates 90° and is in a folded state.

[0014] Another aspect of this utility model provides a treadmill, including the side armrest folding limiting structure described above.

[0015] This utility model's side armrest folding and limiting structure locks the armrest by connecting it to a limiting hole with a pin. The pin's movement is controlled by a wrench and a pivot. The overall structure is not only simple but also reliable. Furthermore, because the limiting plate's area can be equal to the width of the column, it occupies a relatively small area. This means the entire folding and limiting structure occupies a minimal area of ​​the column and armrest, allowing for a compact structure that minimizes space requirements while still fulfilling the folding function, thus facilitating user operation and use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the handrail in a folded state according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the handrail in the unfolded state according to an embodiment of the present invention.

[0018] Figure 3 This is an exploded view of the side armrest folding limiting structure according to an embodiment of the present utility model.

[0019] Figure 4 This is an exploded view of the handrail according to an embodiment of the present utility model.

[0020] Figure 5 This is a schematic diagram showing the positional relationship between the first and second slide grooves when the handrail is locked, according to an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram showing the positional relationship between the first and second sliding grooves when the handrail is unlocked according to an embodiment of the present invention. Detailed Implementation

[0022] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0023] The side armrest folding limiting structure provided in this embodiment of the utility model includes a base and an armrest 1 rotatably connected to the base. A limiting plate 2 is provided on the base, and the limiting plate 2 is parallel to the rotation plane of the armrest 1. Connecting holes 21 are provided at different positions on the limiting plate 2, and each connecting hole 21 is located on an arc with the rotation center of the armrest 1 as the center. A wrench 5, a pin 3, and a pin shaft 4 are provided on the armrest 1. The axis of the pin 3 is perpendicular to the limiting plate 2 and can be inserted into the limiting hole 21 to lock the armrest 1. The pin shaft 4 is connected to the pin 3 laterally. The wrench 5 is rotatably connected to the armrest 1, and the first end of the wrench 5 is connected to the pin shaft 4, and the second end extends away from the base. Moving the second end of the wrench 5 can move the first end of the wrench 5 away from the limiting plate 2 and drive the pin 3 to move with the pin shaft 4 to be pulled out from the connecting hole 21, so that the armrest 1 can rotate on the base.

[0024] In a specific embodiment of this utility model, the side armrest folding limiting structure is connected to the upright column 6 of the treadmill. The armrest 1 can be folded or unfolded along the axial direction of the upright column 6 to meet the user's need for the folding function of the armrest 1. The limiting plate 2 is set on the end face of the upright column 6 and is perpendicular to the upright column 6. It should be noted that the area of ​​the limiting plate 2 should be similar to the width of the upright column 6 to ensure that the folded armrest 1 does not affect the user's use. In addition, the limiting plate 2 can be set at the upper end of the armrest 1 or at the lower end of the armrest 1. A pivot connecting plate can also be set on the other side of the limiting plate 2 to connect the armrest 1 between the limiting plate 2 and the pivot connecting plate.

[0025] Furthermore, the end of the handrail 1 is provided with a connecting shaft hole 14, and the corresponding positions of the limiting plate 2 and the rotating shaft connecting plate are provided with through holes 22 for connecting the rotating shaft of the handrail 1. The rotating shaft 23 of the handrail passes through the limiting plate 2, the connecting shaft hole 14 and the rotating shaft connecting plate in succession, so that the handrail 1 is rotatably connected to the column 6.

[0026] Furthermore, the first side of the handrail 1 (i.e. the side corresponding to the limiting plate 2) is provided with a pin 3 that can reciprocate along the axial direction. The limiting plate 2 is provided with connecting holes 21 at different positions, and each connecting hole 21 is located on an arc with the rotation center of the handrail 1 as the center. Therefore, rotating the handrail 1 can make the pin 3 correspond to different connecting holes 21. When the pin 3 is inserted into different connecting holes 21, the self-locking limit of the handrail 1 is realized, and the handrail 1 can be rotated more.

[0027] Furthermore, in this embodiment of the present invention, the pin 3 is connected from the side by the pin shaft 4. By moving the second end of the wrench 5 from the armrest 1, the first end can drive the pin shaft 4 to move, thereby pulling the pin 3 out of the connecting hole 21 and realizing the rotation of the armrest 1 on the base. When the armrest 1 rotates to the position corresponding to the other connecting hole 21, the wrench 5 is moved again. Or, in some embodiments with elastic elements, the wrench 5 can be released to allow the pin 3 to enter the connecting hole 21, thereby realizing the relocking of the armrest 1.

[0028] The side armrest folding limiting structure provided in this embodiment of the utility model locks the armrest by connecting it to the limiting hole 21 with a pin 3. The movement of the pin is controlled by a wrench 5 and a pin shaft 4. The overall structure is not only simple but also reliable in operation. At the same time, since the area of ​​the limiting plate 2 can be equal to the width of the column 6, the limiting plate 2 occupies a small area. That is, the entire folding limiting structure occupies a very small area of ​​the column 6 and the armrest 1, so that while satisfying the folding function, the overall structure is compact, occupies little space, and is convenient for user operation and use.

[0029] Furthermore, in a specific embodiment of this utility model, the wrench 5 includes a first connecting plate 51 and a second connecting plate 52 connected at a preset first angle. The connection point of the first connecting plate 51 and the second connecting plate 52 is rotatably connected to the armrest 1. One end of the first connecting plate 51 is connected to the pin 4, and one end of the second connecting plate 52 extends away from the base. When the armrest 1 is in the locked state, there is a tossing distance between the second connecting plate 52 and the armrest 1. When the second connecting plate 52 is tossed around the connection point and moves closer to the armrest 1, the first connecting plate 51 can be rotated in the opposite direction to drive the spring pin 4 to move along the axial direction of the pin.

[0030] As attached Figure 3-4 As shown in the embodiment of this utility model, the first connecting plate 51 includes two parallel first connecting side plates located on both sides of the handrail 1. The second connecting plate 52, in addition to including the two second connecting side plates, also includes a connecting base plate 54 connecting the two second connecting side plates. A wrench 5 is connected to the handrail 1 by engaging a locking screw and a locking bolt (not shown in the figures). When the handrail 1 is locked, the pin 3 protrudes from the upper side (i.e., the first side) of the handrail 1 and connects to the connecting hole 21. At this time, the first connecting plate 51 remains parallel to the axial direction of the handrail 1, and the second connecting plate 52 maintains a certain angle with the handrail 1. When it is necessary to rotate the handrail 1, simply hold the connecting base plate 54, bringing it close to the handrail 1. This allows the first connecting plate 51 to drive the pin 4 downwards, thereby causing the pin 4 to move downwards and be pulled out of the connecting hole 21.

[0031] The locking and unlocking mechanism of the handrail 1 provided in this embodiment of the utility model has a simple structure, is easy and stable to operate, and is more adapted to the user's movement habits, thus improving the user experience.

[0032] Furthermore, in a specific embodiment of this utility model, the pin 3 is inserted into the inside of the handrail 1 from the first side of the handrail 1. A first sliding groove 11 is provided on the second side of the handrail 1. A first connecting plate 51 is arranged parallel to the second side of the handrail 1. A second sliding groove 53 is provided on the first connecting plate 51. The second sliding groove 53 and the first sliding groove 11 are arranged to intersect each other. The pin 4 is inserted into both the second sliding groove 53 and the first sliding groove 11 and connected to the pin 3. When the second connecting plate 52 is moved, the pin 4 can move under the limitation of the first sliding groove 11 and the second sliding groove 53.

[0033] Specifically, the pin 3 is provided with a pin through hole for the pin shaft 4 to connect to. After the pin 3 is inserted into the handrail 1 from the first side, the pin shaft 4 passes through the second slide groove 53, the first slide groove 11, the pin through hole, the first slide groove 11, and the second slide groove 53 in sequence to achieve the connection between the pin shaft 4 and the pin 3. The movement of the pin shaft 4 can be controlled from both the left and right sides of the handrail 1. This improves the accuracy and stability of the operation and makes it easier to operate the lever 5.

[0034] Furthermore, as shown in the appendix Figure 4 As shown, in a specific embodiment of this utility model, the first sliding groove 11 on the handrail 1 is a straight groove arranged along the axial direction of the pin 3, and the second sliding groove 53 is a straight groove arranged along the transverse direction of the pin 3. The width of both the first sliding groove 11 and the second sliding groove 53 is slightly larger than that of the pin 4, that is, the pin 3 can be moved into the first sliding groove 11 and the second sliding groove 53. When the second connecting plate 52 rotates around the connection point, the second sliding groove 53 rotates around the connection point and drives the pin 4 to slide on the first sliding groove 11.

[0035] In this embodiment of the invention, the first slide groove 11 is designed as a straight groove along the axial direction of the pin 3, ensuring that the pin 3 reciprocates in a straight line to accurately insert into the connecting hole 21. Simultaneously, since the position of the second slide groove 53 corresponding to the first slide groove 11 changes when the first connecting plate 51 rotates, designing the second slide groove 53 as a straight groove along the transverse direction of the pin 3 allows for sufficient space for movement within the second slide groove 53 of the pin 4 when the first connecting plate 51 rotates. Furthermore, the groove surface of the second slide groove 53 abuts against the pin 4, causing the pin 4 to move along the first slide groove 11 following the rotation of the second slide groove 53. This invention, through the ingenious design of the first slide groove 11 and the second slide groove 53, controls the stable movement of the pin 3.

[0036] Furthermore, Figures 5-6 The diagram illustrates the structure and positional relationship of the first slide groove 11 and the second slide groove 53 according to another embodiment of the present invention. As shown in the attached figures, in this embodiment, the first slide groove 11 includes a longitudinal groove and a transverse groove connected to each other. The transverse groove includes a semi-circular groove and an arc-shaped transition section connected to the longitudinal groove. The semi-circular groove of the transverse groove is clearance-fitted with the pin 4. The width of the longitudinal groove is greater than the diameter of the pin 4. The second slide groove 53 is connected to a locking groove and a sliding groove at a preset second angle. The locking groove includes a semi-circular groove and an arc-shaped transition section connected to the sliding groove. When the pin 3 is in the locked state, the locking groove is perpendicular to the transverse groove and limits the pin 4 to the locked state. When the second connecting plate 52 rotates around the connection point, the locking groove moves downward, causing the sliding groove to gradually approach the pin 4. Then, under the drive of the sliding groove, the pin 4 enters the longitudinal groove and moves to the bottom end of the longitudinal groove under the limitation of the longitudinal groove and the sliding groove.

[0037] In this embodiment of the invention, when the handrail 1 is in the locked state, the transverse groove of the first slide groove 11 and the locking groove of the second slide groove 53 lock the pin 4 around its perimeter, ensuring that the pin 4 does not move within the position defined by the first slide groove 11 and the second slide groove 53, and that the pin 3 will not disengage from the limiting position due to minor vibrations, thus improving the stability of the handrail 1 in the locked state. During the unlocking process, the second slide groove 53 rotates downwards, at which time the second slide groove 53 will drive the pin 4 to approach the arc-shaped transition section of the first slide groove 11. Because this arc-shaped structure allows the pin 4 to transition more smoothly into the longitudinal groove of the first slide groove 11, and because the width of the longitudinal groove of the first slide groove 11 is greater than the width of the pin 4, the pin 4 can move more smoothly to the bottom of the longitudinal groove without being rubbed by the groove edge.

[0038] When the lever 5 is released or pulled downwards, the second slide groove 53 rotates upwards. At this time, since the locking groove and the sliding groove of the second slide groove 53 are also arc-shaped transition sections, the pin 4 can smoothly transition into the locking groove of the second slide groove 53, and move to the horizontal groove of the first slide groove 11 under the action of the locking groove to lock the pin 4. This embodiment of the utility model, by setting specific structures for the first slide groove 11 and the second slide groove 53, not only keeps them in a fixed position when the armrest 1 is locked, but also makes the movement of the pin 4 smoother during the unlocking and locking process, improving the user's operating experience.

[0039] It should be noted that in the above embodiments, since the pin 3 also involves horizontal movement during the up-down movement, the first side of the handrail 1 is also provided with a transverse sliding groove in this embodiment of the utility model. The pin 3 can move back and forth in the transverse sliding groove (that is, it moves in the transverse direction during the axial movement) so that the pin 3 moves closer to or further away from the limiting plate 2 in the transverse direction.

[0040] Furthermore, based on the movement trajectory of the pin 3 in the above embodiments, in this embodiment of the present invention, the connecting hole 21 is located at the edge of the limiting plate 2, so that the side of the connecting hole 21 facing the limiting plate 2 is an arc-shaped structure that matches the outer diameter of the pin 3, and the side of the connecting hole 21 away from the limiting plate 2 also includes a parallel opening to provide space for the pin 3 to move laterally.

[0041] Understandably, when the movement direction of pin 3 is only the axial direction of pin 3, the limiting hole 21 can also be set at the edge of the limiting plate 2, making it easier for pin 3 to be inserted into the limiting hole 21. The limiting hole 21 can also be set in the middle of the limiting plate 2 to form a circular hole.

[0042] Furthermore, in this embodiment of the present invention, the handrail 1 is also provided with an elastic element, which provides elastic force for the pin 3 to insert into the connecting hole 21, so that the handrail 1 is kept in a locked state.

[0043] Figure 4 In the illustrated embodiment, a spring 13 is provided below the pin 3. In its natural state, the spring 13's elasticity allows the pin 3 to extend out of the first side of the handrail 1 and remain inserted into the connecting hole 21, thus locking the handrail 1. In other embodiments of this invention, an elastic element can be provided between the connecting base plate of the second connecting plate 52 and the handrail 1. In its natural state, the elastic element applies a force away from the handrail 1 to the connecting base plate, which similarly allows the pin 3 to extend out of the first side of the handrail 1 and remain inserted into the connecting hole 21. There are many ways to provide the elastic element, and this invention will not list them all.

[0044] Furthermore, in a specific embodiment of the present invention, the connecting hole 21 includes a first connecting hole 21 and a second connecting hole 21 with a right angle at the center. When the pin 3 is connected to the first connecting hole 21, the handrail 1 is in an unfolded state. When the pin 3 is connected to the second connecting hole 21, the handrail 1 rotates 90° and is in a folded state.

[0045] This embodiment of the utility model provides a treadmill with handrails 1 connected to the uprights 6 on the left and right sides of the treadmill. The limiting holes 21 on the left and right sides can be staggered, and the handrails 1 are parallel when folded. This ensures that the left and right handrails 1 are parallel and facing each other when folded, preventing interference caused by insufficient frame width.

[0046] This utility model embodiment provides a folding and limiting structure for a side armrest 1, including a base and an armrest 1 rotatably connected to the base. A limiting plate 2 is provided on the base, and the limiting plate 2 is parallel to the rotation plane of the armrest 1. Connecting holes 21 are provided at different positions on the limiting plate 2, and each connecting hole 21 is located on an arc with the rotation center of the armrest 1 as the center. A wrench 5, a pin 3, and a pin shaft 4 are provided on the armrest 1. The axis of the pin 3 is perpendicular to the limiting plate 2 and can be inserted into the limiting hole 21 to lock the armrest 1. The pin shaft 4 is connected to the pin 3 laterally. The wrench 5 is rotatably connected to the armrest 1, and the first end of the wrench 5 is connected to the pin shaft 4, while the second end extends away from the base. Moving the second end of the wrench 5 can cause the first end of the wrench 5 to drive the pin shaft 4, and the pin shaft 4 will drive the pin 3 to be pulled out of the connecting hole 21, so that the armrest 1 can rotate on the base. The locking and unlocking mechanism of the armrest 1 provided by this utility model embodiment has a simple structure, is easy to operate, and is stable.

[0047] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made to the above embodiments by those skilled in the art after reading this specification are all within the scope of protection of the present invention. The various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0048] If the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

Claims

1. A side armrest folding and limiting structure, characterized in that, The device includes a base and a handrail rotatably connected to the base. A limit plate is provided on the base, parallel to the rotation plane of the handrail. Connecting holes are located at different positions on the limit plate, all situated on an arc centered on the rotation center of the handrail. The handrail is equipped with a wrench, a pin, and a pivot. The axis of the pin is perpendicular to the limit plate and can be inserted into the limit hole to lock the handrail. The pivot is connected to the pin laterally. The wrench is rotatably connected to the handrail, with its first end connected to the pivot and its second end extending away from the base. Moving the second end of the wrench moves the first end away from the limit plate, causing the pin to move with the pivot and be pulled out of the connecting hole, allowing the handrail to rotate on the base.

2. The side armrest folding limiting structure according to claim 1, characterized in that, The wrench includes a first connecting plate and a second connecting plate connected at a preset first angle. The connection point of the first connecting plate and the second connecting plate is rotatably connected to the handrail. One end of the first connecting plate is connected to a pin, and one end of the second connecting plate extends away from the base. When the handrail is locked, there is a toggle distance between the second connecting plate and the handrail. When the second connecting plate is rotated around the connection point and moves closer to the handrail, the first connecting plate can be rotated in the opposite direction to drive the pin to move along the axial direction of the pin.

3. The side armrest folding limiting structure according to claim 2, characterized in that, A pin is inserted into the handrail from the first side of the handrail. A first groove is provided on the second side of the handrail. A first connecting plate is set parallel to the second side of the handrail. A second groove is provided on the first connecting plate. The second groove and the first groove are intersected. The pin is inserted into both the second groove and the first groove and connected to the pin. When the second connecting plate is moved, the pin can move under the limitation of the first groove and the second groove.

4. The side armrest folding limiting structure according to claim 3, characterized in that, The first groove is a straight groove arranged along the axial direction of the pin, and the second groove is a straight groove arranged along the transverse direction of the pin. The width of both the first groove and the second groove is slightly larger than the pin. When the second connecting plate rotates around the connection point, the second groove rotates around the connection point and drives the pin to slide on the first groove.

5. The side armrest folding limiting structure according to claim 3, characterized in that, The first slide groove includes a longitudinal groove and a transverse groove that are connected to each other. The transverse groove includes a semi-circular groove and an arc-shaped transition section that connects to the longitudinal groove. The semi-circular groove of the transverse groove is clearance-fitted with the pin. The width of the longitudinal groove is greater than the diameter of the pin. The second slide groove is a locking groove and a sliding groove that are connected at a preset second angle. The locking groove includes a semi-circular groove and an arc-shaped transition section that connects to the sliding groove. When the pin is in the locked state, the locking groove is perpendicular to the transverse groove and restricts the pin to the locked state. When the second connecting plate rotates around the connection point, the locking groove moves downward and the sliding groove gradually approaches the pin. Then, under the drive of the sliding groove, the pin enters the longitudinal groove and moves to the bottom of the longitudinal groove under the restriction of the longitudinal groove and the sliding groove.

6. The side armrest folding limiting structure according to claim 5, characterized in that, The first side of the handrail is also provided with a transverse groove, in which the pin can move back and forth to move closer to or further away from the limiting plate in the transverse direction.

7. The side armrest folding limiting structure according to any one of claims 1-6, characterized in that, The connecting hole is located at the edge of the limiting plate, with the side of the connecting hole facing the limiting plate having an arc-shaped structure that matches the outer diameter of the pin. The side of the connecting hole away from the limiting plate also includes a parallel opening to provide space for the pin to move laterally.

8. The side armrest folding limiting structure according to claim 1, characterized in that, The handrail is also equipped with an elastic element, which provides the pin with the elastic force to insert into the connection hole, so that the handrail is kept in the locked state.

9. The side armrest folding limiting structure according to claim 1, characterized in that, The connecting holes include a first connecting hole and a second connecting hole with a right angle at the center. When the pin is connected to the first connecting hole, the handrail is in the unfolded state. When the pin is connected to the second connecting hole, the handrail rotates 90° and is in the folded state.

10. A treadmill, characterized in that, Includes the side armrest folding limiting structure as described in any one of claims 1-9.

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