Handrail folding self-locking storage mechanism and treadmill

Abstract

The utility model discloses a handrail folding self -locking storage mechanism, including handrail and base, handrail is including fixedly connected's hand department and pivot, and the base is provided with first connecting part and second connecting part along the axial direction, and the pivot is rotatively connected with first connecting part, and the pivot is provided with the limiting structure of polygon, and the second connecting part is provided with the polygonal hole of matching with the appearance of limiting structure, the pivot can reciprocate along the axial direction on the base, makes limiting structure insert or pull out second connecting part, fixes in second connecting part when limiting structure inserts second connecting part, makes hand department fix in specific working angle, when limiting structure pulls out second connecting part, the pivot can rotate on the base around first connecting part to change the connecting angle of hand department on the base. The utility model discloses simple structure, convenient operation, stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of fitness equipment, and in particular to a folding self-locking storage mechanism for handrails and a treadmill. Background Technology

[0002] Based on the current market conditions and public demand for exercise equipment, handrails, especially those on treadmills, are typically non-foldable. However, user surveys indicate that most users desire handrails that can be unfolded and folded for easy gripping during rest periods and to prevent collisions while running. Foldable handrails are particularly important for small home treadmills.

[0003] The folding handrails in the current technology have a relatively cumbersome folding process, which is not conducive to users folding the handrails quickly during exercise. Moreover, most handrails currently fold downwards, which means that the folded handrails still occupy some space above the running board, reducing the user experience. Utility Model Content

[0004] The purpose of this utility model is to provide a folding self-locking storage mechanism for handrails, so as to solve the problem that there are very few handrails with folding functions used in sports equipment in the prior art, and the folding steps are too complicated. The specific technical solution is as follows:

[0005] A folding self-locking storage mechanism for an armrest includes an armrest and a base. The armrest includes a fixedly connected hand support and a pivot. The base has a first connecting part and a second connecting part arranged along the axial direction. The pivot is rotatably connected to the first connecting part and has a polygonal limiting structure. The second connecting part has a polygonal hole matching the shape of the limiting structure. The pivot can reciprocate along the axial direction on the base, allowing the limiting structure to be inserted into or removed from the second connecting part. When the limiting structure is inserted into the second connecting part, it is fixed in the second connecting part, fixing the hand support at a specific working angle. When the limiting structure is removed from the second connecting part, the pivot can rotate around the first connecting part on the base to change the connection angle of the hand support on the base.

[0006] Furthermore, an elastic element is provided between the pivot and the base, which provides elastic force for the limiting structure to enter the second connecting part.

[0007] Furthermore, the base is provided with a column, the first connecting part is fixedly provided on the side of the column, the second connecting part is fixedly provided below the first connecting part, the rotating shaft includes a circular rotating shaft and a polygonal shaft connected to the end of the circular rotating shaft, and the radius of the inscribed circle of the polygonal shaft is less than or equal to the radius of the circular rotating shaft. The rotating shaft can be inserted into the base through the first connecting part, and when it moves to the end, the polygonal shaft is connected to the second connecting part.

[0008] Furthermore, the base is provided with a column, the first connecting part is fixedly provided on the side of the column, the second connecting part is fixedly provided above the first connecting part, the rotating shaft includes a circular rotating shaft and a polygonal shaft connected between the circular rotating shaft and the handrail, and the radius of the circumcircle of the polygonal shaft is larger than the radius of the circular rotating shaft. The rotating shaft can be inserted into the base through the first connecting part, and when it moves to the end, the polygonal shaft is connected to the second connecting part.

[0009] Furthermore, a limit block is connected to the middle region of the rotating shaft, and a spring is sleeved on the outside of the rotating shaft. One end of the spring abuts against the limit block, and the other end abuts against the first connecting part or the second connecting part. The spring applies a spring force to the limit block near the second connecting part so that the polygonal shaft is kept in the second connecting part.

[0010] Furthermore, the base is provided with a column, and the first connecting part includes two parts, which are fixedly set on both sides of the column axis respectively. The second connecting part is set between the two first connecting parts. A polygonal limiting block is fixedly connected to the rotating shaft, and the radius of the outer circle of the polygonal limiting block is larger than the radius of the rotating shaft body. The rotating shaft can be inserted into the base through the first connecting part, and when it moves to the end, the polygonal limiting block located in the middle is inserted into the second connecting part.

[0011] Furthermore, a spring is provided between the polygonal limiting block and the first connecting part. The spring is sleeved on the outside of the rotating shaft. The spring applies a spring force to the polygonal limiting block near the second connecting part so that the polygonal limiting block is kept in the second connecting part.

[0012] Furthermore, the base is provided with a column, and the column is provided with a column hole for connecting the rotating shaft. The column hole includes a circular column hole at the top and a polygonal column hole at the end. The rotating shaft includes a circular rotating shaft and a polygonal shaft connected to the end of the circular rotating shaft. The radius of the circumcircle of the polygonal shaft is less than or equal to the radius of the circular rotating shaft. The rotating shaft can be inserted into the column through the circular column hole, and when it moves to the end, the polygonal shaft connects with the polygonal column hole.

[0013] Furthermore, a limit baffle is provided at the end of the column, and the handrail is located between the column and the limit baffle.

[0014] Another aspect of this utility model provides a treadmill, including the handrail folding self-locking storage mechanism described above.

[0015] This utility model discloses a folding and self-locking storage mechanism for handrails. The handrail includes a fixedly connected armrest and a rotating shaft. The rotating shaft is rotatably connected to a first connecting part on a base, allowing it to rotate around the base. A polygonal limiting structure is also provided on the rotating shaft. A second connecting part on the base has a second connecting part whose shape matches the polygonal limiting structure. By controlling the reciprocating movement of the rotating shaft along the axial direction, the limiting structure can be inserted into or removed from the second connecting part. When the limiting structure is inserted into the second connecting part, it is fixed in the second connecting part, thus fixing the armrest at a specific working angle. When the limiting structure is removed from the second connecting part, the rotating shaft can rotate around the first connecting part on the base, changing the connection angle of the armrest on the base. This utility model achieves the folding and storage function of the handrail with a simple structure and can achieve self-locking in various working states. It is simple to operate, stable, and reliable. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the handrail in the folded state according to the first embodiment of this utility model.

[0017] Figure 2 This is a schematic diagram of the handrail in the unfolded state according to the first embodiment of this utility model.

[0018] Figure 3 This is an enlarged view of the handrail portion of the first embodiment of this utility model.

[0019] Figure 4 This is an exploded view of the armrest folding self-locking storage mechanism according to the first embodiment of this utility model.

[0020] Figure 5 This is an exploded view of the armrest folding self-locking storage mechanism according to the third embodiment of this utility model.

[0021] Figure 6 This is an exploded view of the armrest folding self-locking storage mechanism according to the fourth embodiment of this utility model. 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 folding self-locking storage mechanism for the armrest 1 provided in this embodiment of the utility model includes an armrest 1 and a base 2. The armrest 1 includes a fixedly connected hand support 13 and a pivot. The armrest 1 is connected to the base 2 via the pivot and can rotate on the base 2 with the pivot, so as to at least achieve the following: Figure 1 The folding state and attachment shown Figure 2 The two working angles shown in the unfolded state allow users to use the armrest 1 when it is unfolded and to store the armrest 1 when it is folded.

[0024] Furthermore, in order to realize the transformation of the handrail 1 between different angles, in this embodiment of the present invention, the base 2 is provided with a first connecting part 21 and a second connecting part 22 along the axial direction. The first connecting part 21 is provided with a circular hole for the rotating shaft to rotate. The rotating shaft can be rotatably connected to the first connecting part 21 (it can be understood that the diameter of the circular hole should be equal to or slightly larger than the diameter of the rotating shaft, so that a clearance fit is formed between the rotating shaft and the circular hole, ensuring that the rotating shaft can rotate while keeping the rotating shaft stable in the circular hole). The rotating shaft is provided with a polygonal limiting structure 12, and the second connecting part 22 is provided with a polygonal hole that matches the shape of the limiting structure 12, so that the polygonal limiting structure 12 on the rotating shaft can be inserted into the polygonal hole of the second connecting part 22. Since different sides of the polygonal limiting structure 12 can correspond to different sides of the polygonal hole on the second connecting part 22, different connection angles can be exhibited. Therefore, this embodiment of the present invention can limit the angle of each working state of the handrail 1 by setting the number of sides of the polygonal limiting structure 12. Its principle is simple and convenient to operate.

[0025] Furthermore, since the polygonal limiting structure 12 needs to change angles within the polygonal through-hole, in the preferred embodiment of this utility model, all sides of the limiting structure 12 are of equal length. In a specific embodiment of this utility model, the polygonal limiting structure 12 is a square. In this case, rotating one side of the polygonal limiting structure 12 can rotate the handrail 1 by 90°, which precisely meets the requirement of 90° folding of the handrail 1.

[0026] Furthermore, in this embodiment of the present invention, the rotating shaft can reciprocate along the axial direction on the base 2, so that the limiting structure 12 can be inserted into or pulled out of the second connecting part 22. When the limiting structure 12 is inserted into the second connecting part 22, each side of the limiting structure 12 abuts against each side of the second connecting part 22, so that the handrail 13 is fixed at a specific working angle. When the limiting structure 12 is pulled out of the second connecting part 22, the rotating shaft can rotate around the first connecting part 21 on the base 2 to change the connection angle of the supported part on the base 2, thereby realizing the folding and unfolding of the handrail 1.

[0027] In a preferred embodiment of this invention, the reciprocating distance of the rotating shaft is limited, ensuring that the rotating shaft is always connected to at least one first connecting part 21, thus guaranteeing that the rotating shaft is connected to the base 2. Optionally, in this embodiment, the outward movement distance of the rotating shaft is unrestricted, allowing the armrest 1 to be detachably connected to the base 2. In summary, the function of the reciprocating movement of the rotating shaft in the axial direction is to insert or remove the limiting structure 12 from the second connecting part 22, thereby allowing the armrest 1 to rotate around the base 2 when the second connecting part 22 is removed, and fixing the armrest 1 to the base 2 when the second connecting part 22 is inserted.

[0028] Furthermore, in order to ensure that the handrail 1 remains connected to the base 2 at all times and remains fixedly connected to the base 2 during operation, in a preferred embodiment of this utility model, an elastic element is also provided between the pivot and the base 2. The elastic element provides the elastic force for the limiting structure 12 to enter the second connecting part 22. Thus, during normal use of the handrail 1, the limiting structure 12 is always inserted into the second connecting part 22, ensuring the fixation of the handrail 1. When it is necessary to rotate the handrail 1, the limiting structure 12 needs to be pulled out of the second connecting part 22 against the elastic force of the elastic element, and then the handrail 1 can be rotated. After the handrail 1 is rotated to the appropriate position, releasing the handrail 1 will allow the limiting structure 12 to automatically insert into the second connecting part 22, making the folding and unfolding operation of the handrail 1 more convenient.

[0029] Figures 1 to 4 A detailed structural diagram of the folding self-locking storage mechanism of the armrest 1 according to the first embodiment of this utility model is shown. (Refer to...) Figures 1-4 In the first embodiment of this utility model, a column 24 is provided on the base 2, a first connecting part 21 is fixedly provided on the side of the column 24, and a second connecting part 22 is fixedly provided below the first connecting part 21. The rotating shaft includes a circular rotating shaft 11 and a polygonal shaft connected to the end of the circular rotating shaft 11. The polygonal shaft is a polygonal limiting structure 12, and the radius of the circumcircle of the polygonal shaft is less than or equal to the radius of the circular rotating shaft 11. The rotating shaft can be inserted into the base 2 through the first connecting part 21, and when it moves to the end, the polygonal shaft is connected to the second connecting part 22.

[0030] Specifically, both the first connecting part 21 and the second connecting part 22 are connecting blocks fixed to the side of the column 24. The two connecting blocks can be welded to the column 24. The circular hole on the first connecting part 21 is a through hole, and the polygonal hole on the second connecting part 22 can be either a through hole or a hole closed at the bottom, to cooperate with the first connecting part 21 to limit the insertion distance of the rotating shaft. It should be noted that in this embodiment of the invention, the number of first connecting parts 21 can be more than one. By providing first connecting parts 21 at both the top and bottom, the connection relationship of the rotating shaft during rotation can be ensured, avoiding misalignment.

[0031] Furthermore, the polygonal shaft at the end of the rotating shaft can be machined at the end of the circular rotating shaft 11. While ensuring that the circumcircle of the polygonal shaft is less than or equal to the radius of the circular rotating shaft 11, the rounded corners of each corner can be retained to avoid stress concentration between the polygonal shaft and the polygonal hole at the corner positions and improve the service life of the handrail 1.

[0032] Furthermore, in this embodiment of the present invention, a limiting block 23 is connected to the middle region of the rotating shaft, and a spring 3 is sleeved on the outside of the rotating shaft. One end of the spring 3 abuts against the limiting block 23, and the other end abuts against the first connecting part 21 or the second connecting part 22. The spring 3 applies elastic force to the limiting block 23 to keep the polygonal shaft in the second connecting part 22. In this embodiment of the present invention, gaskets 31 are also provided on both sides of the spring 3 to prevent the spring 3 from leaking out of the hole in the limiting block 23 or the first connecting part 21, thereby improving the stability of the spring operation.

[0033] Specifically, a threaded hole is provided in the middle area of ​​the rotating shaft, and a threaded through hole is provided on the limiting block 23. After the rotating shaft is inserted into the first connecting part 21, the spring 3 is inserted into the rotating shaft, and the limiting block 23 is fixed in the threaded hole on the rotating shaft with screws. In fact, since the outer diameter of the limiting block 23 is larger than the circular through hole of the first connecting part 21, the armrest 1 always maintains the connection state with the base 2. At the same time, due to the elastic force of the spring 3, the limiting hole is provided with elastic force away from the first connecting part 21, thereby ensuring that the polygonal shaft at the end of the rotating shaft is always inserted into the polygonal hole of the second connecting part 22.

[0034] When it is necessary to rotate the handrail 1, lift the handrail 1 upwards so that the polygonal shaft at the end of the pivot is pulled out of the polygonal hole of the second connecting part 22, allowing the pivot to rotate around the circular through hole of the first connecting part 21. After rotating to an angle that is a multiple of the inner angle of the polygonal shaft, release the handrail 1, and under the action of the spring force 3, the polygonal shaft will automatically insert into the polygonal hole of the second connecting part 22.

[0035] The folding self-locking storage mechanism of the handrail 1 provided in this embodiment of the utility model has a simple structure and is easy to operate. The handrail 1 can be folded with simple operation, and the handrail 1 can easily achieve self-locking in the unfolded and stored state due to the cooperation of the polygonal shaft and the polygonal hole.

[0036] The second embodiment of this utility model is an alternative to the first embodiment. Specifically, a column 24 is provided on the base, a first connecting part 21 is fixedly provided on the column 24, a second connecting part 22 is fixedly provided above the first connecting part 21, and the rotating shaft includes a circular rotating shaft 11 and a polygonal shaft connected between the circular rotating shaft 11 and the handrail 13. The radius of the circumcircle of the polygonal shaft is greater than the radius of the circular rotating shaft 11. The rotating shaft can be inserted into the base 2 through the first connecting part 21, and when it is moved to the end, the polygonal shaft is connected to the second connecting part 22.

[0037] The second embodiment of this utility model is the opposite of the first embodiment. The polygonal shaft is placed between the circular rotating shaft 11 and the hand support 13. In this case, in order to facilitate the insertion of the rotating shaft, the inscribed circle of the polygonal shaft should be larger than the radius of the rotating shaft. The rotating shaft can be inserted into the base 2 through the second connecting part 22, and the end of the rotating shaft is inserted into the first connecting part 21.

[0038] It should be noted that although the first connecting part 21 and the second connecting part 22 are both located at the beginning and end of the rotating shaft in this embodiment of the present invention, this arrangement is not unique. They can also be located in the middle region of the rotating shaft as needed. Alternatively, multiple first connecting parts 21 and second connecting parts 22 can be provided to improve the stability of the handrail 1.

[0039] Furthermore, in the second embodiment of this utility model, the middle region of the rotating shaft is also connected to a limiting block 23, and a spring is sleeved on the outside of the rotating shaft. One end of the spring abuts against the limiting block 23, and the other end abuts against the first connecting part 21 or the second connecting part 22. The spring applies elastic force to the limiting block 23 to keep the polygonal shaft in the second connecting part 22.

[0040] Specifically, in the second embodiment of this utility model, the spring is preferably disposed between the second connecting part 22 and the limiting block 23. After the limiting block 23 and the spring are connected, the spring provides elastic force to the limiting block 23 near the first connecting part 21, which ensures that the rotating shaft is always inserted into the base 2. Optionally, the spring can also be disposed between the first connecting part 21 and the limiting block 23. In this case, both ends of the spring are fixedly connected to the first connecting part 21 and the limiting block 23 respectively, and provide a pulling force to the limiting block 23 near the first connecting part 21, ensuring that the rotating shaft is always inserted into the base 2.

[0041] Figure 5 The third embodiment of the present invention illustrates a folding self-locking storage mechanism for the armrest 1. In this embodiment, a column 24 is provided on the base 2. Two first connecting parts 21 are provided, which are respectively fixedly provided on both sides of the column 24. A second connecting part 22 is provided between the two first connecting parts 21. A polygonal limiting block 14 is fixedly connected to the rotating shaft. The polygonal limiting block 14 combines the functions of a polygonal limiting structure and a limiting block 23. The radius of the outer circle of the polygonal limiting block 14 is larger than the radius of the rotating shaft body. The rotating shaft can be inserted into the base 2 through the first connecting part 21. When it moves to the end, the polygonal limiting block 14 located in the middle is inserted into the second connecting part. After the rotating shaft is inserted into the first connecting part 21 and the second connecting part 22, the polygonal limiting block 14 abuts against the polygonal hole on the inner side of the second connecting part 22.

[0042] Specifically, in the third embodiment of this utility model, a threaded hole is provided on the rotating shaft, and a threaded through hole is provided on the polygonal limiting block 14. After the rotating shaft is inserted into the first connecting part 21 above, the polygonal limiting block 14 is connected to the rotating shaft by bolts. The polygonal limiting block 23 can not only lock the rotating shaft, but also keep the armrest 1 connected to the base 2.

[0043] Furthermore, in the third embodiment of this utility model, the upper first connecting part 21 has a circular through hole, the inner side of the second connecting part 22 has a polygonal through hole, the lower first connecting part 21 can be a circular through hole or a circular countersunk hole, and the bottom end face of the circular countersunk hole of the lower first connecting part 21 can limit the insertion distance of the rotating shaft.

[0044] In the third embodiment of this utility model, a spring (not shown in the figure) is also provided between the polygonal limiting block 14 and the first connecting part 21 (which can be the first connecting part 21 located above or the first connecting part 21 located below). The spring is sleeved on the outside of the rotating shaft, and the spring applies a spring force to the polygonal limiting block 23 near the second connecting part 22 so that the polygonal limiting block 23 is inserted into the second connecting part 22.

[0045] Specifically, by reasonably setting the position of the spring, after the handrail 1 is inserted into the base 2, the spring force just ensures that the polygonal limiting block 23 is inserted into the second connecting part 22 to limit the handrail 1. When it is necessary to rotate the handrail 1, lifting the handrail 1 upward or pressing the handrail 1 downward can realize the rotation of the pivot.

[0046] The third embodiment of this utility model, while satisfying the folding and storage function of the armrest 1, ensures that the top and bottom ends of the pivot are stably connected in the first connecting part 21, thereby improving the stability of the armrest 1 when it rotates.

[0047] Figure 6 The fourth embodiment of the present invention shows a folding self-locking storage mechanism for the armrest 1. In this embodiment, a column 24 is provided on the base 2. The column 24 has a column 24 hole for connecting the rotating shaft. The column 24 hole includes a circular column hole 27 (i.e., the first connecting part 21) located at the upper part and a polygonal column hole 28 (i.e., the second connecting part 22) located at the end. The rotating shaft includes a circular rotating shaft 11 and a polygonal shaft (i.e., the polygonal limiting structure 12) connected to the end of the circular rotating shaft 11. The radius of the circumscribed circle of the polygonal shaft is less than or equal to the radius of the circular rotating shaft 11. The rotating shaft can be inserted into the column 24 through the circular rotating shaft hole 27, and when it moves to the end, the polygonal shaft connects with the polygonal column hole 28.

[0048] Furthermore, in this embodiment of the present invention, a limiting baffle 25 is also provided at the end of the column 24, and the handrail 13 is located between the column 24 and the limiting baffle 25. An elastic element is provided between the handrail 13 and the limiting baffle 25 to provide elastic force for the handrail 1 to enter the column 24.

[0049] Specifically, the limiting baffle 25 can be bolted to the column 24. After the handrail 1 is placed, connecting the limiting baffle 25 to the column 24 ensures that the handrail 1 is always connected to the pivot. A connecting plate 26 is also provided on the side of the limiting baffle 25. The limiting baffle 25 is connected to the column 24 via the connecting plate 26. The connection position of the connecting plate 26 should avoid the rotation trajectory of the handrail 1; that is, the side of the limiting baffle 25 should include a hole for the handrail to rotate, allowing the handrail 1 to fold and unfold on the column 24. The elastic element can be a spring located at the top of the limiting baffle 25 and the handrail 1. The spring does not have to be a traditional circular structure. By setting the spring to an irregular shape, making its width greater than the width of the hole on the side of the limiting baffle 25, the spring is prevented from popping out of the hole. Alternatively, a slot is provided at the bottom of the limiting baffle 25, allowing the spring to rotate into the slot and be fixed to the limiting baffle 25, preventing the spring from popping out of the hole.

[0050] In a specific embodiment of this utility model, a column hole is directly provided inside the column 24, avoiding the need to install additional connecting parts on the side of the column 24, making the column 24 more aesthetically pleasing overall. Simultaneously, a limiting baffle 25 is connected to the top of the column, which can conceal part of the handrail 1 structure, further enhancing the overall aesthetics of the structure.

[0051] In addition, this utility model also provides a treadmill, such as Figure 1 and Figure 2 As shown, the treadmill includes two uprights, and the folding self-locking storage mechanism for the handrails provided by this utility model is connected to the treadmill.

[0052] This utility model provides a folding and self-locking storage mechanism for an armrest. The armrest includes a fixedly connected handrail and a rotating shaft. The rotating shaft is rotatably connected to a first connecting part on a base, allowing it to rotate around the base. A polygonal limiting structure is also provided on the rotating shaft. A second connecting part on the base has a second connecting part that matches the shape of the polygonal limiting structure. By controlling the reciprocating movement of the rotating shaft along the axial direction, the limiting structure can be inserted into or removed from the second connecting part. When the limiting structure is inserted into the second connecting part, it is fixed in the second connecting part, thus fixing the handrail at a specific working angle. When the limiting structure is removed from the second connecting part, the rotating shaft can rotate around the first connecting part on the base to change the connection angle of the handrail on the base. This utility model achieves the folding and storage function of the armrest through a simple structure and can achieve self-locking of the armrest in various working states. It is simple to operate, stable, and reliable. Since the different sides of the polygonal limiting structure correspond to the different sides of the polygonal hole on the second connecting part, the rotation angle can be changed. Therefore, the present invention can lock and rotate the handrail by inserting or pulling out the limiting structure into the second connecting part, thereby limiting the working state of the handrail. Its principle is simple and easy to operate.

[0053] 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.

[0054] 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 folding self-locking storage mechanism for armrests, characterized in that, The device includes an armrest and a base. The armrest includes a fixedly connected handrail and a pivot. The base has a first connecting part and a second connecting part arranged along the axial direction. The pivot is rotatably connected to the first connecting part and has a polygonal limiting structure. The second connecting part has a polygonal hole that matches the shape of the limiting structure. The pivot can reciprocate along the axial direction on the base, allowing the limiting structure to be inserted into or removed from the second connecting part. When the limiting structure is inserted into the second connecting part, it is fixed in the second connecting part, fixing the handrail at a specific working angle. When the limiting structure is removed from the second connecting part, the pivot can rotate around the first connecting part on the base to change the connection angle of the handrail on the base.

2. The armrest folding self-locking storage mechanism according to claim 1, characterized in that, An elastic element is provided between the pivot and the base, which provides elastic force for the limiting structure to enter the second connecting part.

3. The armrest folding self-locking storage mechanism according to claim 2, characterized in that, The base is provided with a column, the first connecting part is fixedly set on the side of the column, and the second connecting part is fixedly set below the first connecting part. The rotating shaft includes a circular rotating shaft and a polygonal shaft connected to the end of the circular rotating shaft. The radius of the circumcircle of the polygonal shaft is less than or equal to the radius of the circular rotating shaft. The rotating shaft can be inserted into the base through the first connecting part, and when it moves to the end, the polygonal shaft is connected to the second connecting part.

4. The armrest folding self-locking storage mechanism according to claim 2, characterized in that, The base is provided with a column, a first connecting part is fixedly set on the side of the column, and a second connecting part is fixedly set above the first connecting part. The rotating shaft includes a circular rotating shaft and a polygonal shaft connected between the circular rotating shaft and the handrail. The radius of the inscribed circle of the polygonal shaft is larger than the radius of the circular rotating shaft. The rotating shaft can be inserted into the base through the first connecting part, and when it is moved to the end, the polygonal shaft is connected to the second connecting part.

5. The armrest folding self-locking storage mechanism according to claim 3 or 4, characterized in that, A limit block is also connected to the middle area of ​​the rotating shaft, and a spring is sleeved on the outside of the rotating shaft. One end of the spring abuts against the limit block, and the other end abuts against the first connecting part or the second connecting part. The spring applies a spring force to the limit block near the second connecting part so that the polygonal shaft is kept in the second connecting part.

6. The armrest folding self-locking storage mechanism according to claim 2, characterized in that, The base is provided with a column. The first connecting part includes two parts, which are fixedly set on both sides of the column axis. The second connecting part is set between the two first connecting parts. A polygonal limiting block is fixedly connected to the rotating shaft. The radius of the outer circle of the polygonal limiting block is larger than the radius of the rotating shaft body. The rotating shaft can be inserted into the base through the first connecting part, and when it moves to the end, the polygonal limiting block located in the middle is inserted into the second connecting part.

7. The armrest folding self-locking storage mechanism according to claim 6, characterized in that, A spring is also provided between the polygonal limiting block and the first connecting part. The spring is sleeved on the outside of the rotating shaft. The spring applies a spring force to the polygonal limiting block near the second connecting part so that the polygonal limiting block is kept in the second connecting part.

8. The armrest folding self-locking storage mechanism according to claim 1 or 2, characterized in that, The base is provided with a column, and the column has a column hole for connecting the rotating shaft. The column hole includes a circular column hole at the top and a polygonal column hole at the end. The rotating shaft includes a circular rotating shaft and a polygonal shaft connected to the end of the circular rotating shaft. The radius of the circumcircle of the polygonal shaft is less than or equal to the radius of the circular rotating shaft. The rotating shaft can be inserted into the column through the circular column hole, and when it moves to the end, the polygonal shaft connects with the polygonal column hole.

9. The armrest folding self-locking storage mechanism according to claim 8, characterized in that, A limit baffle is also provided at the end of the column, and the handrail is located between the column and the limit baffle.

10. A treadmill, characterized in that, Includes the armrest folding self-locking storage mechanism as described in any one of claims 1-9.

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