Manually adjusted lifting mechanism and treadmill

Abstract

The embodiment of the utility model discloses a manually-adjusted lifting mechanism and a treadmill. The lifting mechanism comprises a frame, two first supporting structures arranged at the first end of the frame and two second supporting structures arranged at the second end of the frame. The second supporting structure comprises a second supporting leg, a limiting plate and a supporting rod, a sliding groove is formed in the side face of the limiting plate, and a limiting notch is formed in one side of the sliding groove in the length direction; the supporting rod is rotatably connected with the second supporting leg and provided with a limiting block, and the limiting block can slide in the sliding groove. According to the embodiment, manual adjustment is adopted, and compared with a lifting mechanism driven by a motor, the manufacturing cost and the maintenance cost are low. The supporting structures are arranged at the two ends of the frame of the treadmill, and the gradient of the treadmill can be adjusted to be positive gradient or negative gradient or horizontal according to needs. And for the negative gradient, the multi-stage adjusting function is achieved, and the angle of the negative gradient can be adjusted according to needs.

Description

Technical Field

[0001] This application relates to a manually adjustable lifting mechanism and a treadmill. Background Technology

[0002] Traditional treadmills use electric lifting motors for their height adjustment function, which results in higher manufacturing costs. Furthermore, traditional treadmills are all inclined (incline: the front of the running platform is higher than the back, so the platform is uphill when the user is facing it), making the fitness experience relatively limited. Utility Model Content

[0003] This application provides a manually adjustable lifting mechanism and a treadmill to address at least one technical deficiency in the prior art.

[0004] A first aspect of this application provides a manually adjustable lifting mechanism, comprising: a frame having a first end and a second end opposite to each other in its length direction; two first support structures disposed at the first end of the frame and respectively disposed on both sides of the frame in the length direction; each first support structure including a first leg, the first end of the first leg being rotatably connected to the frame, the first leg being selectively rotatable between a supported state and a folded state; and two second support structures disposed at the second end of the frame and respectively disposed on both sides of the frame in the length direction; wherein the second support structure includes: a second leg, the first end of the second leg being... The system comprises: a rotatably connected frame; a limiting plate fixedly connected to the frame, with its side parallel to the rotational surface of the second leg; a sliding groove on the side of the limiting plate, with at least one limiting notch on at least one side of the sliding groove along its length; and a support rod, the first end of which is rotatably connected between the first and second ends of the second leg, and the second end of which is provided with a limiting block that can slide within the sliding groove; wherein the second leg can selectively rotate toward the supporting surface and drive the support rod to cause the limiting block to slide within the sliding groove, and the limiting block can selectively slide into the limiting notch to lock the supporting state of the second leg.

[0005] In some embodiments, the slide has a first end away from the second leg and a second end near the second leg, and the limiting notch is provided on the sidewall of the second end of the slide.

[0006] In some embodiments, the length direction of the chute is parallel to the length direction of the treadmill, and at least one of the limiting notches is provided on the side of the chute facing the frame.

[0007] In some implementations, the direction of extension of the limiting notch forms an acute angle with respect to the length direction of the groove.

[0008] In some embodiments, the second support structure further includes a spring, one end of which acts on the frame and the other end of which acts on the second leg, the spring providing a driving force for the second leg to rotate into a folded state.

[0009] In some embodiments, a connecting rod is provided between the two second support structures, with a first end of the connecting rod connected to a support rod of one of the second support structures and a second end of the connecting rod connected to a support rod of the other second support structure, and the two second support structures are kept synchronized by the connecting rod.

[0010] In some implementations, the second end of the second leg is provided with a rotatable wheel.

[0011] In some embodiments, the frame includes at least two opposing side borders, which are located on opposite sides of the frame along its length; the two first support structures and the two second support structures are located on the two side borders.

[0012] In some implementations, the cooperation between the first support structure and the second support structure can be selectively adjusted to at least one negative slope state.

[0013] In some implementations, the fit between the first support structure and the second support structure can be selectively adjusted to a positive slope, a negative slope, or a horizontal state.

[0014] In some implementations, the first support structure further includes a support base, which is fixedly connected to the frame, and a first end of the first leg is rotatably connected to the support base; the first leg can be selectively rotated toward the support surface.

[0015] In some implementations, when the first leg is in a supported state, the first side of the first leg facing the frame abuts against the frame;

[0016] When the first leg is in the folded state, the second side of the first leg facing the frame abuts against the frame.

[0017] In some embodiments, the support base includes a base and a hinge, the base being fixedly connected to the frame, the hinge being fixedly connected to the base, and the first leg being rotatably connected to the hinge; a first groove is provided on the side of the first side near the second side, and when the first leg is in a supported state, the first groove can accommodate at least a portion of the base; a second groove is provided on the side of the second side near the first side, and when the first leg is in a folded state, the second groove can accommodate at least a portion of the base.

[0018] In some implementations, the side of the first leg is provided with a buckle groove.

[0019] A second aspect of this application provides a treadmill that includes a running belt and the aforementioned lifting mechanism. A first roller is provided at a first end of the frame, and a second roller is provided at a second end of the frame. The running belt wraps around the first roller and the second roller.

[0020] Compared with existing technologies, the implementation scheme of this application adopts manual adjustment, which results in lower manufacturing and maintenance costs compared to motor-driven lifting mechanisms. Secondly, the treadmill frame of this application has support structures at both ends, allowing the incline of the treadmill to be adjusted to a positive incline, negative incline, or level as needed. Thirdly, for negative inclines, this application has multi-level adjustment functions, allowing the angle of the negative incline to be adjusted as required. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein:

[0022] Figure 1 This is a schematic diagram of the treadmill from one perspective in an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the treadmill from one perspective in an embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the structure of the first leg in an embodiment of this application;

[0025] Figure 4 This is a schematic diagram showing the first support structure in this embodiment of the application disposed below the first frame and in a folded state;

[0026] Figure 5 This is a schematic diagram showing the first support structure in this embodiment of the application disposed below the first frame and in a supported state;

[0027] Figure 6This is a schematic diagram showing the first support structure in a supported state in an embodiment of this application, with the bottom of the support seat housed in the first groove;

[0028] Figure 7 This is a schematic diagram showing the first support structure in a folded state and the bottom of the support base being housed in the second groove in an embodiment of this application.

[0029] Figure 8 This is a schematic diagram showing the second support structure disposed below the frame in an embodiment of this application;

[0030] Figure 9 This is a schematic diagram of the structure of the limiting plate in the embodiments of this application;

[0031] Figure 10 This is a schematic diagram of the structure and associated state of the second leg and support rod in an embodiment of this application;

[0032] Figures 11 to 14 This is a schematic diagram showing the state of the first to fourth stages of the second support structure in the embodiments of this application;

[0033] Figure 15 This is a schematic diagram showing the state of the limiting block moving in the groove of the limiting plate in the embodiment of this application;

[0034] Figure 16 and Figure 17 This is a schematic diagram of two inclines of the treadmill in the embodiments of this application;

[0035] Figure 18 This is a schematic diagram showing the treadmill in a horizontal position in an embodiment of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 10 - Frame; 10a - First end; 10b - Second end; 101 - First border; 102 - Second border; 103 - Horizontal frame;

[0038] 201-Treadmill belt; 202-First roller; 2021-Pulley; 203-Second roller; 204-Motor; 205-Control circuit;

[0039] 30-First support structure; 301-First leg; 3011-First side; 3012-Second side; 3013-Third side; 3014-Fourth side; 3015-First groove; 3016-Second groove; 3017-Shaft hole; 3018-Snap groove; 302-Support base; 3021-First hinge; 3022-Second hinge; 3023-Base;

[0040] 40-Second support structure; 401-Second support leg; 402-Support rod; 4021-Limiting block; 403-Limiting plate; 4031-Slide groove; 4031a-Head end; 4031b-Tail end; 4032-Limiting notch; 4032a-First notch; 4032b-Second notch; 4032c-Third notch; 404-Wheel; 405-Tension spring; 406-Connecting rod. Detailed Implementation

[0041] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0042] In the description of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and do not require that this application be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. The terms "connected," "linked," and "set up" used in this application should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; direct connections or indirect connections through intermediate components; wired connections, radio connections, or wireless communication signal connections. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0043] The accompanying drawings illustrate one or more examples of this application. The detailed description uses numerical and alphabetic designations to refer to features in the drawings. Similar or analogous designations in the drawings and description have been used to refer to similar or analogous parts of this application. As used herein, the terms “first,” “second,” and “third,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0044] like Figure 1As shown in the figure, according to an embodiment of this application, a treadmill is provided, which includes a frame 10 and a running belt 201. A first roller 202 is provided at a first end 10a of the frame 10, and a second roller 203 is provided at a second end 10b of the frame 10, with the first roller 202 and the second roller 203 arranged opposite to each other. The frame 10 includes a first side frame 101 and a second side frame 102 that are parallel to each other. The first roller 202 and the second roller 203 are disposed between the first side frame 101 and the second side frame 102, and the two ends of the first roller 202 and the second roller 203 are respectively connected to the first side frame 101 and the second side frame 102. The running belt 201 wraps around the first roller 202 and the second roller 203. In some embodiments, the treadmill also includes a motor 204, as shown in the figure. The motor 204 is disposed at the first end of the frame 10, and the output end of the motor 204 is connected to the pulley 2021 of the first roller 202 via a transmission belt. The pulley 2021 is fixedly installed at the end of the first roller 202. In addition, in some embodiments, the treadmill is also provided with a control circuit 205 for controlling the working state of the motor 204 and the working state of other electronic components on the treadmill. The specific composition and structure of the control circuit 205 are not specifically limited here.

[0045] In the embodiments of this application, users typically board the treadmill from the second end of frame 10. Therefore, in the embodiments of this application, a positive incline state of the treadmill is defined as when the first end 10a of frame 10 is higher than the second end 10b; conversely, a negative incline state of the treadmill is defined as when the first end 10a of frame 10 is lower than the second end 10b. Furthermore, in this application, the first end 10a and the second end 10b of frame 10 are located at opposite ends of the length direction of frame 10, which is also the length direction of the treadmill, the first frame 101, and the second frame 102.

[0046] In the embodiments of this application, the first end 10a and the second end 10b of the frame 10 are both provided with support structures for adjusting the height of the two ends, and the incline of the treadmill is adjusted by the support structures at both ends.

[0047] like Figure 1 and Figure 2 As shown, the first end of the frame 10 is provided with two first support structures 30, which are symmetrically installed on the first side frame 101 and the second side frame 102.

[0048] like Figures 1 to 5As shown, taking one side of the first frame 101 as an example, in some embodiments, the first support structure 30 is disposed on the side of the first frame 101 facing the ground. The first support structure 30 includes a first leg 301 and a support base 302. The support base 302 is fixedly connected to the first frame 101, and the first leg 301 has a first end and a second end in opposite directions. The first end of the first leg 301 is rotatably connected to the support base 302 via a shaft. The axis of the shaft is parallel to the side of the frame 10 facing the ground. The first leg 301 can selectively rotate about the shaft so that the second end of the first leg 301 rotates towards or away from the ground. Wherein, the second end of the first leg 301 rotates towards the ground and can support the first end of the frame 10.

[0049] like Figure 3 As shown, in some embodiments, the first leg 301 has a first side surface 3011 at its first end and a second side surface 3012 at its second end. The first leg 301 also has a third side surface 3013 and a fourth side surface 3014 in opposite directions, both extending between the first side surface 3011 and the second side surface 3012. The distance between the first side surface 3011 and the second side surface 3012 is greater than the distance between the third side surface 3013 and the fourth side surface 3014. The first end of the first leg 301 is provided with a shaft hole 3017, and the distance between the shaft hole 3017 and the third side surface 3013 is less than the distance between the shaft hole 3017 and the fourth side surface 3014. The shaft of the first support structure 30 can pass through the shaft hole 3017 and be rotatably connected. The first side surface 3011, the second side surface 3012, the third side surface 3013, and the fourth side surface 3014 are all parallel to the axis of the shaft hole 3017.

[0050] like Figure 4 As shown in the attached figures (arrow A in the accompanying drawings indicates the first end of frame 10), this figure illustrates the folded state of the first support structure 30, in which at least a portion of the third side 3013 of the first leg 301 abuts against the first side, and the third side 3013 is in contact with the ground. Figure 5 As shown in the figure, the first support structure 30 is in a supported state, in which at least a portion of the first side 3011 of the first leg 301 abuts against the first side, and the second side 3012 of the first leg 301 abuts against the ground. The first support structure 30 can be extended from its folded state along... Figure 4 Rotating the first leg 301 in the direction of the arrow in the diagram will switch it to the supporting state. The first supporting structure 30 can be rotated from the supporting state along... Figure 5 Rotate the first leg 301 in the direction of the arrow to turn it into a folded state.

[0051] like Figure 5As shown in the figure, L1 is an auxiliary line perpendicular to the first frame 101, and L2 is an auxiliary line along the length from the first end to the second end of the first support leg 301. It can be seen from the figure that when the first support leg is in the supporting state, the angle between its length extension line L2 and the auxiliary line L1 perpendicular to the first frame is not 90 degrees. During the supporting process, when the length direction of the first support leg 301 rotates to be perpendicular to the first frame 101, it continues to rotate by a preset angle α to make the first support leg 301 more stable in the supporting state.

[0052] like Figure 3 , Figure 6 and Figure 7 As shown, the support base 302 of the first support structure 30 includes a base 3023 and a first hinge 3021 and a second hinge 3022 disposed on the base 3023. The first end of the first leg 301 is disposed between the first hinge 3021 and the second hinge 3022 and is rotatably connected. A first recessed groove 3015 is provided on the side of the first side 3011 near the third side 3013. When the first support structure 30 is in the supported state, the first groove 3015 can accommodate at least a portion of the base 3023 to increase the contact area between the first side 3011 of the first leg 301 and the first frame 101. A second recessed groove 3016 is provided on the side of the third side 3013 near the first side 3011. When the first support structure 30 is in the retracted state, the second groove 3016 can accommodate at least a portion of the base 3023 to increase the contact area between the third side 3013 of the first leg 301 and the first frame 101.

[0053] like Figure 3 As shown, in some embodiments, the first leg 301 further includes a fifth side and a sixth side in opposite directions, both extending between the first side 3011, the second side 3012, the third side 3013, and the fourth side 3014. The fifth side and / or the sixth side are provided with inwardly recessed grooves 3018, allowing fingertips to be inserted into the grooves 3018 when the first support structure 30 is switched between a retracted state and a supported state, so that the first leg 301 has a better force-bearing point.

[0054] like Figure 1 and Figure 2 As shown, the second end of the frame 10 is provided with two second support structures 40, which are symmetrically installed on the first frame 101 and the second frame 102.

[0055] like Figure 1 and Figure 8As shown, taking one side of the first frame 101 as an example, in some embodiments, the second support structure 40 is disposed on the side of the first frame 101 facing the ground. The second support structure 40 includes a second leg 401, a support rod 402 and a limiting plate 403.

[0056] like Figure 8 As shown, the first end of the second leg 401 is rotatably connected to the first frame 101, and the second end of the second leg 401 can be selectively rotated toward or away from the ground.

[0057] like Figure 8 and Figure 9 As shown, the length direction of the limiting plate 403 is the same as the length direction of the first frame 101. The limiting plate 403 is fixedly connected to the first frame 101, and the side of the limiting plate 403 is parallel to the rotation surface of the second support leg 401. In this embodiment, the rotation surface of the second support leg 401 and the side of the limiting plate 403 are both perpendicular to the side of the first frame 101 facing the ground. The side of the limiting plate 403 is provided with a groove 4031, the length direction of the groove 4031 is the same as the length direction of the first frame 101, and the groove 4031 has a head end 4031a facing the second end of the frame 10 and a tail end 4031b in the opposite direction to the head end 4031a. The side of the groove 4031 facing the first frame 101 is provided with at least one limiting notch 4032, as shown in the figure. Figure 9 In this embodiment, three limiting notches 4032 are provided, which are sequentially designated as the first notch 4032a, the second notch 4032b, and the third notch 4032c from the first end 4031a to the tail end 4031b of the slide groove 4031. The first notch 4032a is located close to the first end 4031a of the slide groove 4031, and there is a certain distance between the first end 4031a and the first notch 4032a.

[0058] In some embodiments, such as Figure 9 As shown, Figure 9 In the diagram, L3 is an auxiliary line along the length of the groove 4031, L4 is an auxiliary line along the extension direction of the third notch 4032c, and L5 is perpendicular to auxiliary line L3. As shown in the diagram, auxiliary line L4 forms an acute angle β with respect to auxiliary line L3. The purpose is that when the second support structure 40 provides support for the treadmill, in the length direction of the first frame 101, the force exerted by the limiting block 4021 on the limiting notch 4032 is directed away from the second leg 401. Therefore, the limiting notch 4032 is recessed towards the first frame 101 and in the length direction of the first frame 101 away from the second leg 401, so that when the second support structure 40 is in a supported state, the movement of the limiting block 4021 within the limiting notch 4032 is further restricted, and the limiting engagement between the limiting block 4021 and the limiting notch 4032 is more stable.

[0059] like Figures 8 to 10As shown, the first end of the support rod 402 is rotatably connected to the second support leg 401. In this embodiment, the connection point between the support rod 402 and the second support leg 401 is located at the middle of the length direction of the second support leg 401. The second end of the support rod 402 is provided with an outwardly protruding limiting block 4021. The limiting block 4021 can slide along the length direction of the slide groove 4031 and can selectively slide into one of the limiting notches 4032 and engage with each other. During the sliding process of the limiting block 4021 of the support rod 402 in the slide groove 4031, the support rod 402 drives the second support leg 401 to selectively unfold to support the second end of the frame 10, and after the limiting block 4021 is embedded in the limiting notch 4032, the unfolding range of the second support leg 401 is locked, thereby fixing the height of the second end of the frame 10.

[0060] In some embodiments, such as Figure 8 As shown, the second support structure 40 also includes a tension spring 405. One end of the tension spring 405 acts on the second leg 401, and the second end of the tension spring 405 is located on the side of the second leg 401 facing the limiting plate 403 and acts on the first frame 101. The tension spring 405 provides a driving force for the second leg 401 to rotate into a folded state. Its purpose is that when the second leg 401 is in the supported state, the limiting block 4021 can be restricted within the limiting notch 4032 by the aforementioned tension force. When the second leg 401 is subjected to other external forces, the limiting block 4021 can still disengage from the limiting notch 4032 and can be selectively moved to other limiting notches 4032. In addition, the tension force provided by the tension spring 405 can also assist the second leg 401 in quickly changing from the supported state to the retracted state and keep the second leg 401 in the retracted state continuously. In addition to the tension spring 405, in some embodiments, a coil spring or a floor spring can also be provided at the junction of the second leg 401 and the first frame 101, which can replace the tension spring 405 and achieve the above-mentioned technical effects of the tension spring 405. No specific limitations are made here.

[0061] In some embodiments, such as Figure 8 As shown, a connecting rod 406 is provided between the two second support structures 40. The first end of the connecting rod 406 is connected to the side of the support rod 402 of one of the second support structures 40 that is away from the limiting plate 403, and the second end of the connecting rod 406 is connected to the side of the support rod 402 of the other second support structure 40 that is away from the limiting plate 403. The connecting rod 406 allows the two second support structures 40 to remain synchronized when adjusting the gear, simplifying the operation. Moreover, the two second support structures 40 can also mutually restrain each other, thereby improving the stability of the treadmill.

[0062] In some embodiments, such as Figure 8 As shown, the second end of the second leg 401 is equipped with a wheel 404 to facilitate moving the treadmill.

[0063] like Figures 11 to 15The different states of the second support structure 40 shown include:

[0064] Figure 11 The limiting block 4021 is located at the first end 4031a of the slide 4031. At this time, the second support structure 40 is in the lowest state, which can be defined as the first position of the second support structure 40.

[0065] like Figure 12 The limiting block 4021 is located at the first notch 4032a on the limiting plate 403 and is engaged with it for limiting. As can be seen from the figure, compared with the first position of the second support structure 40, the second end of the frame 10 is raised in height, and this state can be defined as the second position of the second support structure 40;

[0066] like Figure 13 The limiting block 4021 is located at the second notch 4032b on the limiting plate 403. Figure 14 The limiting block 4021 is located in the third notch 4032c on the limiting plate 403. Compared with the first and second levels of the second support structure 40, the second end of the frame 10 is further raised in height, which can be defined as the third and fourth levels of the second support structure 40 in turn.

[0067] like Figure 14 The limiting block 4021 is located in the groove 4031 between the second notch 4032b and the third notch 4032c on the limiting plate 403. This state can be understood as the second support structure 40 changing from the fourth gear to other gears, or changing from other gears other than the fourth gear to the fourth gear. The change of other gears is similar to that shown in the figure, and will not be described again here.

[0068] The treadmill of this application can be adjusted to various inclines through the cooperation of the first support structure 30 and the second support structure 40. For example... Figure 16 As shown, the first support structure 30 is in a supporting state, and the second support structure 40 is in the first position (the second end of the frame 10 is in its lowest position), at which point the treadmill is in a positive incline state. Figure 17 As shown, the first support structure 30 is in a supporting state, and the second support structure 40 is in the third position state (the state of the second support structure 40 when the limiting block 4021 is located at the second notch 4032b of the limiting plate 403). At this time, the treadmill is in a negative incline state. Additionally, as... Figure 18 As shown, when both the first support structure 30 and the second support structure 40 are in the folded state, the treadmill is in a horizontal state. Here, "horizontal" means that the treadmill is parallel to the ground, not specifically a plane perpendicular to the direction of gravity.

[0069] In some embodiments, a crossbeam is provided at the first end of the frame 10, and the two ends of the crossbeam are fixedly connected to the first side frame 101 and the second side frame 102, respectively. The two first support structures 30 in the above embodiments can also be installed on the crossbeam, wherein the first support structure 30 is as close as possible to the first side frame 101 and the other first support structure 30 is as close as possible to the second side frame 102, so that a sufficient distance is maintained between the two first support structures 30, thereby improving the stability of the treadmill.

[0070] In the above embodiments, "ground" is a general term for the support surface of the treadmill, and does not refer only to the earth.

[0071] The above descriptions are merely examples of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A manually adjustable lifting mechanism, characterized in that, comprising: a frame (10) having opposite first and second ends (10a, 10b) in its length direction; two first support structures (30) provided at the first end (10a) of the frame (10) and arranged on opposite sides of the frame (10) in its length direction, each first support structure (30) comprising a first leg (301) having a first end rotatably connected to the frame (10) and being selectively rotatable between a supporting state and a folding state; and two second support structures (40) provided at the second end (10b) of the frame (10) and arranged on opposite sides of the frame (10) in its length direction; wherein each second support structure (40) comprises: a second leg (401) having a first end rotatably connected to the frame (10); a limiting plate (403) fixedly connected to the frame (10) and having a side surface parallel to a rotation surface of the second leg (401), the side surface of the limiting plate (403) being provided with a sliding groove (4031) having at least one limiting notch (4032) on at least one side in its length direction; and a support rod (402) having a first end rotatably connected between the first and second ends of the second leg (401) and a second end provided with a limiting block (4021) slidable in the sliding groove (4031); wherein the second leg (401) is selectively rotatable towards a supporting surface and drives the support rod (402) to make the limiting block (4021) slide in the sliding groove (4031), and the limiting block (4021) is selectively slidable into the limiting notch (4032) to lock the supporting state of the second leg (401).

2. The lifting mechanism according to claim 1, characterized in that, the sliding groove (4031) has a first end away from the second leg (401) and a second end close to the second leg (401), and the limiting notch (4032) is provided at the second end of the sliding groove (4031).

3. The lifting mechanism according to claim 1 or 2, characterized in that, the length direction of the sliding groove (4031) is parallel to the length direction of the frame (10), and the limiting notch (4032) is arranged on a side of the sliding groove (4031) facing the frame (10); or / and the limiting notch (4032) extends at an acute angle relative to the length direction of the sliding groove (4031).

4. The lifting mechanism according to claim 1, characterized in that, The second support structure (40) further comprises a spring, one end of the spring acting on the frame (10) and the other end acting on the second leg (401), the spring providing driving force for the rotation of the second leg (401) to the folded state; or / and A connecting rod (406) is arranged between the two second support structures (40), the first end of the connecting rod (406) being connected to the support rod (402) of one of the second support structures (40), the second end of the connecting rod (406) being connected to the support rod (402) of the other second support structure (40), the two second support structures (40) being kept synchronous through the connecting rod (406); or / and The second end of the second leg (401) is provided with a rotatable wheel (404).

5. The lifting mechanism according to claim 1, wherein, The frame (10) comprises at least two oppositely arranged side frames (101, 102), the two side frames (101, 102) being arranged on the two sides of the frame (10) in the length direction; the two first support structures (30) and the two second support structures (40) are arranged on the two side frames (101, 102); or / and The cooperation between the first support structure (30) and the second support structure (40) can selectively adjust at least one negative slope state; or / and The cooperation between the first support structure (30) and the second support structure (40) can selectively adjust a positive slope state, a negative slope state or a horizontal state.

6. The lifting mechanism according to claim 1, wherein, The first support structure (30) further comprises a support seat (302), the support seat (302) being fixedly connected with the frame (10), the first end of the first leg (301) being rotatably connected with the support seat (302); the first leg (301) can selectively rotate towards the direction of the support surface.

7. The lifting mechanism according to claim 6, wherein, The first support structure (30) is arranged on the side of the frame (10) facing the support surface; When the first leg (301) is in the supporting state, the first side of the first leg (301) facing the frame (10) abuts against the frame (10); When the first leg (301) is in the folded state, the second side of the first leg (301) facing the frame (10) abuts against the frame (10).

8. The lifting mechanism according to claim 7, wherein, The support seat (302) comprises a seat bottom (3023) and a hinge, the seat bottom (3023) being fixedly connected with the frame (10), the hinge being fixedly connected with the seat bottom (3023), the first leg (301) being rotatably connected with the hinge; The side of the first side close to the second side is provided with a first groove (3015), the first groove (3015) being capable of accommodating at least a part of the seat bottom (3023) when the first leg (301) is in the supporting state; The second side of the second side close to the first side is provided with a second groove (3016), and the second groove (3016) can accommodate at least a part of the seat bottom (3023) when the first leg (301) is in a folded state.

9. The lifting mechanism according to claim 1, characterized in that, The side of the first leg (301) is provided with a buckle groove (3018).

10. A treadmill, characterized in that, The frame (10) is provided with a first roller (202) at the first end, and the frame (10) is provided with a second roller (203) at the second end, and the running belt (201) is wrapped around the first roller (202) and the second roller (203).

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