Patent Publication Number: US-2023136863-A1

Title: Treadmill

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present invention is based on and claims the priority of Chinese patent application No. 202111289842.X, filed on Nov. 2, 2021. The contents of the above-identified application are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to the technical field of fitness equipment, and in particular, to a treadmill. 
     BACKGROUND OF THE INVENTION 
     With the improvement of people&#39;s living standards, treadmill has gradually become one of people&#39;s favorite fitness equipment because of its simple operation and good exercise effect. At present, there are two types of treadmills, i.e., fixed type and folding type. Folding has increasingly become a necessary function for a treadmill, especially for a household treadmill, because it is convenient for transportation and placement. However, looking at the folding treadmill on the market at present, although it has been continuously improved, the folding operation is still complex and cumbersome, and the safety is not high, which makes the user&#39;s use experience poor. 
     The foregoing description is intended to provide general background information and does not necessarily constitute prior art. 
     SUMMARY OF THE INVENTION 
     In view of the above, the present invention aims to provide a treadmill with convenient and safe folding operation. 
     The present invention provides a treadmill including an interaction assembly, a support assembly and a base assembly. The interaction assembly is pivotally connected with an upper end of the support assembly such that the interaction assembly can rotate relative to the support assembly and switch between a use state and a non-use state. A lower end of the support assembly is pivotally connected with the base assembly such that the support assembly can rotate relative to the base assembly and switch between an unfolding state and a folding state. A locking mechanism is provided at a pivot position between the support assembly and the base assembly, the locking mechanism can switch between an active state and a locking state; in the active state, the support assembly can rotate relative to the base assembly, and in the locking state, the support assembly cannot rotate relative to the base assembly. The treadmill is provided with an operating mechanism, a connecting mechanism and a driving mechanism which are connected sequentially, the operating mechanism is provided on the interaction assembly, the connecting mechanism is provided on the support assembly, the driving mechanism is provided at a pivot position between the support assembly and the base assembly. When the interaction assembly is rotated to switch from the use state to the non-use state, the connecting mechanism is driven by the operating mechanism and then the driving mechanism is driven by the connecting mechanism, so as to cause the locking mechanism to switch from the locking state to the active state. 
     Further, the locking mechanism includes a first locking member and a second locking member, the first locking member is provided on the support assembly, the second locking member is provided on the base assembly; in the active state, the first locking member is unlocked with the second locking member such that the support assembly can rotate relative to the base assembly; in the locking state, the first locking member is locked with the second locking member such that the support assembly cannot rotate relative to the base assembly. 
     Further, the first locking member and the second locking member are provided with a concave-convex matching structure; in the active state, the first locking member is located far away from the second locking member and the concave-convex matching structure is disengaged from each other such that the first locking member is unlocked with the second locking member; in the locking state, the first locking member is located close to the second locking member and the concave-convex matching structure is engaged with each other such that the first locking member is locked with the second locking member. However, the locking between the first locking member and the second locking member may also be achieved by other structures other than the concave-convex matching structure. For example, the first locking member and the second locking member may be clamped to each other. 
     Further, one of the first locking member and the second locking member is provided with at least one protrusion, the other of the first locking member and the second locking member is provided with at least one insertion hole, the at least one protrusion corresponds to the at least one insertion hole to form the concave-convex matching structure; in the active state, the at least one protrusion is disengaged from the at least one insertion hole such that the first locking member is unlocked with the second locking member; in the locking state, the at least one protrusion is engaged in the at least one insertion hole such that the first locking member is locked with the second locking member. 
     Further, the first locking member includes a first plate body, the first plate body is provided with a limiting post, the second locking member includes a second plate body, the second plate body is provided with a first limiting block and a second limiting block, the limiting post is cooperated with the first limiting block and the second limiting block to limit a rotation range of the support assembly relative to the base assembly, such that the support assembly can only rotate and switch between the unfolding state and the folding state. However, other structures may also be used to limit the rotation range of the support assembly relative to the base assembly. 
     Further, the driving mechanism includes an elastic member, a first wedge and a second wedge for cooperating with the first wedge, the first wedge is connected to and driven by the connecting mechanism to move together with the connecting mechanism, the second wedge is fixed on the first locking member, the elastic member is configured to exert a biasing force on the first locking member; when the first wedge is driven to move in a first direction relative to the second wedge, the biasing force drives the first locking member to move away from the second locking member such that the first locking member is unlocked with the second locking member; when the first wedge is driven to move in an opposite second direction relative to the second wedge, the first wedge drives the second wedge and the first locking member to move towards the second locking member such that the first locking member is locked with the second locking member. 
     Further, the first wedge is provided with a first wedge portion facing inwards, an elongated slot extending along a moving direction of the first wedge is provided in a middle of the first wedge; the second wedge is provided with a second wedge portion facing outwards, one of the first wedge portion and the second wedge portion has a thickness gradually increasing downwards, and the other of the first wedge portion and the second wedge portion has a thickness gradually decreasing downwards. 
     Further, the elastic member is a compression spring, one end of the elastic member abuts against one side surface of the first locking member, and the second wedge is fixed on the other side surface of the first locking member. However, other forms of elastic members may also be adopted, for example, instead of using the compression spring, a tension spring may be used, with one end being fixed and the other end being connected to the first locking member. Further, instead of setting the second wedge separately, the second wedge may also be integrally formed with the first locking member, that is, the first locking member may be directly provided with a second wedge portion for cooperating with the first wedge. 
     Further, the base assembly is provided with a sleeve barrel at the pivot position between the support assembly and the base assembly, the support assembly further includes a central shaft passing through the compression spring, the second locking member, the first locking member, the second wedge and the first wedge, wherein the second locking member is fixedly connected to the sleeve barrel. 
     Further, the connecting mechanism includes an intermediate member and a connecting member, one end of the intermediate member is fixedly connected with the operating mechanism, the other end of the intermediate member is pivotally connected with an upper end of the connecting member, the first wedge is connected to a lower end of the connecting member, a rotation of the operating mechanism is converted into a linear movement of the connecting member through the intermediate member, and the linear movement of the connecting member drives the first wedge to move relative to the second wedge. However, other structures may be used to realize the conversion of the rotation of the operating mechanism into the linear movement of the connecting member. 
     Further, the support assembly further includes a supporting member, the connecting member is received in the supporting member, the first locking member is fixedly connected with a lower end of the supporting member. 
     Further, the operating mechanism includes an operating member fixedly connected with the interaction assembly and a rotating shaft fixedly provided on the operating member, the rotating shaft passes through an upper end of the supporting member and is then fixedly connected with the one end of the intermediate member. 
     Further, an upper end of the connecting member is provided with a first limiting portion and a second limiting portion; when the interaction assembly is turned to the use state, the first limiting portion abuts against the rotating shaft to prevent the interaction assembly from further rotating; when the interaction assembly is turned to the non-use state, the second limiting portion abuts against the rotating shaft to prevent the interaction assembly from further rotating. However, the limiting portions may also be set on other structures to limit the rotation of the interaction assembly. 
     Further, the supporting member is provided with a stopping portion; when the interaction assembly is turned to the use state, the stopping portion resists and supports the interaction assembly to prevent the interaction assembly from further rotating. The stopping portion can make the interaction assembly safer and more reliable in use, and the folding operation is simple and convenient. However, the stopping portion may also be omitted, or the stopping portion may be provided on other structures or other positions. 
     Further, the treadmill further includes a rotatable stopper, the rotatable stopper is rotatably connected to the supporting member, the rotatable stopper is provided with an arc protrusion, the operating member is provided with a protruding post; when the interaction assembly is turned to the use state, the rotatable stopper is rotated to cause the arc protrusion to abut against the protruding post for preventing the interaction assembly from rotating in a reverse direction. However, it is also possible to omit the rotatable stopper or to set the rotatable stopper having other structures. 
     Further, the supporting member includes a supporting plate and a supporting pipe, the supporting pipe is hollow, an upper end of the supporting pipe is connected with a lower end of the supporting plate, the first locking member is fixedly connected with a lower end of the supporting pipe; the connecting member includes a connecting plate and a connecting rod, an upper end of the connecting rod is connected with a lower end of the connecting plate, the first wedge is connected to a lower end of the connecting rod, the connecting rod is received in the hollow supporting pipe of the supporting member. 
     Further, an upper end of the supporting plate is provided with an elongated groove with an opening facing upwards, the support assembly further includes a fixing member, the fixing member is provided with an elongated groove with an opening facing downwards, the two elongated grooves are placed opposite and partially overlapped to form a through hole for the rotating shaft of the operating mechanism to pass through, the rotating shaft can rotate in the through hole. The detachable connection between the supporting plate and the fixing member can facilitate the installation of the rotating shaft being fixed with the intermediate member. However, the intermediate member and the rotating shaft may be fixed in a detachable manner, the supporting plate only needs to set a shaft hole corresponding to the rotating shaft, and the fixing member can thus be omitted. Generally speaking, the intermediate member and the rotating shaft are fixed in a non-detachable manner, which can improve the reliability of the fixing between the intermediate member and the rotating shaft. 
     Further, an upper end of the connecting member is provided with a pivot hole, the support assembly further includes a connecting shaft passing through the other end of the intermediate member and the pivot hole, such that the intermediate member is pivotally connected with the connecting member through the connecting shaft. 
     Further, in the use state, the interaction assembly has an included angle with the support assembly, and in the non-use state, the interaction assembly is flush with the support assembly; in the unfolding state, the support assembly has an included angle with the base assembly, and in the folding state, the support assembly is flush with the base assembly. 
     Further, the interaction assembly includes a U-shaped member, the U-shaped member includes a main body located in a middle section and two handles provided at both ends of the main body, the operating mechanism is provided on each of the two handles, the support assembly has two which are respectively located on both sides of the base assembly; when the interaction assembly is in the non-use state and the support assembly is in the folding state, the interaction assembly and the two support assemblies surround the base assembly and are flush with the base assembly. 
     In the treadmill provided by the present invention, due to the linkage between the interaction assembly and the support assembly, when the interaction assembly is rotated to switch from the use state to the non-use state, the operating mechanism can drive the connecting mechanism and then the connecting mechanism drives the driving mechanism, to enable the locking mechanism to switch from the locking state to the active state, such that the support assembly can rotate relative to the base assembly. Thus, the rotation between the support assembly and the base assembly is unlocked or locked while rotating the interaction assembly, and the folding operation of the treadmill is convenient, fast, safe and reliable. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic diagram of the treadmill in the first state according to the embodiment of the present invention. 
         FIG.  2    is a schematic diagram of the treadmill shown in  FIG.  1    in the second state. 
         FIG.  3    is a schematic diagram of the treadmill shown in  FIG.  1    in the third state. 
         FIG.  4    is an isometric, exploded view of the interaction assembly of the treadmill shown in  FIG.  1   . 
         FIG.  5    is an isometric, exploded view of the support assembly and the operating mechanism of the treadmill shown in  FIG.  1   . 
         FIG.  6    is an isometric, exploded view of the support assembly and the operating mechanism of the treadmill shown in  FIG.  1    from another viewing angle (some elements are omitted). 
         FIG.  7    is an isometric, exploded view of the treadmill shown in  FIG.  1   . 
         FIG.  8    is an isometric, assembled view of the treadmill shown in  FIG.  1    (some elements are omitted). 
         FIG.  9    is a partially enlarged view of the portion A of the treadmill shown in  FIG.  8   . 
         FIG.  10    is a partially enlarged view of the portion B of the treadmill shown in  FIG.  8   . 
         FIG.  11    is a partially enlarged view of the portion C of the treadmill shown in  FIG.  8   . 
         FIG.  12    is a partially enlarged view of the portion C of the treadmill shown in  FIG.  8    from another viewing angle (viewed from the inside to the outside). 
         FIG.  13    is a partially enlarged view of the pivot position between the interaction assembly and the support assembly viewed from the inside to the outside when the treadmill shown in  FIG.  8    is in the first state (some elements are omitted). 
         FIG.  14    is a partially enlarged view of the pivot position between the interaction assembly and the support assembly viewed from the inside to the outside when the treadmill shown in  FIG.  8    is in the second state (some elements are omitted). 
         FIG.  15    is a cross-sectional view of the pivot position between the support assembly and the base assembly when the treadmill shown in  FIG.  8    is in the first state. 
         FIG.  16    is a sectional view of the pivot position between the support assembly and the base assembly when the treadmill shown in  FIG.  8    is in the second state. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention. 
     As shown in  FIGS.  1  to  3   , in this embodiment, the treadmill includes an interaction assembly  1 , a support assembly  3 , and a base assembly  5 . 
     The interaction assembly  1  is pivotally connected with an upper end of the support assembly  3 , such that the interaction assembly  1  can rotate relative to the support assembly  3 , to enable the interaction assembly  1  to switch between a use state and a non-use state. In the use state, the interaction assembly  1  has an included angle with the support assembly  3  (as shown in  FIG.  1   ); in the non-use state, the interaction assembly  1  is flush with the support assembly  3 , that is, the interaction assembly  1  and the support assembly  3  are in the same plane (as shown in  FIGS.  2  and  3   ). 
     A lower end of the support assembly  3  is pivotally connected with the base assembly  5 , such that the support assembly  3  can rotate relative to the base assembly  5 , to enable the support assembly  3  to switch between an unfolding state and a folding state. In the unfolding state, the support assembly  3  has an included angle with the base assembly  5  (as shown in  FIGS.  1  and  2   ); in the folding state, the support assembly  3  is flush with the base assembly  5 , that is, the support assembly  3  and the base assembly  5  are in the same plane (as shown in  FIG.  3   ). 
     In this embodiment, the treadmill has three states. The first state is shown in  FIG.  1   , wherein the interaction assembly  1  is in the use state, the support assembly  3  is in the unfolding state, and both the interaction assembly  1  and the support assembly  3  are raised up from the base assembly  5 , such that the treadmill can be used for running exercise. The second state is shown in  FIG.  2   , which is a transition state during the folding process of the treadmill from a use state (i.e., the first state) to a non-use state (i.e., the third state). The third state is shown in  FIG.  3   , wherein the interaction assembly  1  is in the non-use state, the support assembly  3  is in the folding state, both the interaction assembly  1  and the support assembly  3  are folded on the base assembly  5 , the interaction assembly  1  and the support assembly  3  are flush with the base assembly  5 , that is, they are in the same plane, and at this time, the treadmill can be used for walking or for storage without use. After folding, the space occupied by the treadmill is small. 
     As shown in  FIGS.  1  to  4   , the interaction assembly  1  is substantially U-shaped. In this embodiment, the interaction assembly  1  is comprised of a U-shaped member  11  and a functional unit  13 . The U-shaped member  11  includes a main body  111  located in the middle section and two handles  112  provided at both ends of the main body  111 . The functional unit  13  is installed on the main body  111  of the U-shaped member  11 . The functional unit  13  can be set with display screen, operation keys, speakers, etc. The U-shaped member  11  may be a hollow structure formed by fixing (e.g., welding) a plurality of metal sheets together. Of course, in other embodiments, the U-shaped member  11  may also have other structures so as to form the main body  111  and the two handles  112 , and the functional unit  13  may also be made into an integral structure with the U-shaped member  11 . 
     As shown in  FIGS.  4  to  6   , the handle  112  of the interaction assembly  1  is provided with an operating mechanism  10 . The operating mechanism  10  has a plate-like operating member  101  as its main body. One end of the operating member  101  is provided with a rotating shaft  103  on an inner surface of the operating member  101  and a protruding post  105  on an outer surface of the operating member  101 . The rotating shaft  103  is integrally formed or fixedly connected with the operating member  101 . The other end of the operating member  101  is inserted into the hollow structure of the U-shaped member  11  from one end of the U-shaped member  11  and is fixedly connected with the U-shaped member  11 . 
     As shown in  FIGS.  5  to  14   , the support assembly  3  includes a supporting member  31 , a connecting member  32 , an intermediate member  33 , a fixing member  34 , a rotatable stopper  35 , a connecting shaft  36 , a connecting seat  37 , a first wedge  41 , a second wedge  42 , a compression spring  43 , a first locking member  21 , a second locking member  22 , a limiting post  62 , a center shaft  53 , etc. 
     The supporting member  31  includes a supporting plate  311  and a supporting pipe  312  which are fixed to each other. The supporting plate  311  is generally in the shape of a plate, and the supporting pipe  312  is hollow. The upper end of the supporting pipe  312  is fixedly connected with the lower end of the supporting plate  311 , and the lower end of the supporting pipe  312  is fixedly connected with the first locking member  21  (as shown in  FIG.  7   ). 
     The upper end of the supporting plate  311  is provided with an elongated groove (not labelled) with an opening facing upwards, and the fixing member  34  is also provided with an elongated groove (not labelled) with an opening facing downwards. The two elongated grooves are placed opposite and partially overlapped to form a through hole (not labelled) for the rotating shaft  103  of the operating mechanism  10  to pass through, such that the rotating shaft  103  can rotate in the through hole. The supporting plate  311  and the fixing member  34  are fixed by a screw  61 . The fixing member  34  can be detached to facilitate placing the rotating shaft  103  into the elongated groove at the upper end of the supporting plate  311 . The outer surface of the middle section of the supporting plate  311  is provided with a stopping portion  3111  and a fixing seat  3112 . The stopping portion  3111  has a semicircular structure. When the interaction assembly  1  is turned to the use state, the flat surface on the stopping portion  3111  resists and supports the operating member  101  of the interaction assembly  1  to prevent the interaction assembly  1  from further rotating (as shown in  FIG.  9   ). The fixing seat  3112  is used to connect the rotatable stopper  35  such that the rotatable stopper  35  can be rotatably connected to the supporting member  31 . 
     The rotatable stopper  35  includes a pulling portion  351  and a connecting portion  352  with a certain angle formed between them. The upper end of the connecting portion  352  is provided with an arc protrusion  3521  which corresponds to the protruding post  105  of the operating member  101 . When the interaction assembly  1  is turned to the use state, the rotatable stopper  35  is rotated by operating the pulling portion  351  to cause the arc protrusion  3521  to abut against the protruding post  105  and thereby prevent the interaction assembly  1  from rotating in a reverse direction (as shown in  FIG.  9   ). 
     The connecting member  32  includes a connecting plate  321  and a connecting rod  322  which are fixed to each other. The upper end of the connecting rod  322  is connected with the lower end of the connecting plate  321  by, for example, welding, and the lower end of the connecting rod  322  is connected with the connecting seat  37  by, for example, welding. The connecting seat  37  is used to connect the first wedge  41  (as shown in  FIGS.  7 ,  11  and  12   ). The connecting rod  322  is received in the hollow supporting pipe  312  of the supporting member  31 . The upper end of the connecting plate  321  is provided with a pivot hole  3211 , a first limiting portion  3212  and a second limiting portion  3213 . When the interaction assembly  1  is turned to the use state, the first limiting portion  3212  abuts against the rotating shaft  103  to prevent the interaction assembly  1  from further rotating (as shown in FIG,  13 , with the intermediate member  33  being omitted for clarity). When the interaction assembly  1  is turned to the non-use state, the second limiting portion  3213  abuts against the rotating shaft  103  to prevent the interaction assembly  1  from further rotating (as shown in  FIG.  14   , with the intermediate member  33  being omitted for clarity). 
     The intermediate member  33  is generally shaped like the number of  8 , and is provided with two through holes  331 . One through hole  331  is used for the rotating shaft  103  of the operating member  101  to pass through, and then the intermediate member  33  is fixed to the rotating shaft  103  by, for example, welding. The connecting shaft  36  passes through the other through hole  331  and the pivot hole  3211  of the connecting plate  321 , such that the intermediate member  33  is pivotally connected with the connecting member  32  through the connecting shaft  36 . When the operating member  101  is rotated, the intermediate member  33  is brought to rotate together with the operating member  101  due to the intermediate member  33  being fixedly connected with the rotating shaft  103  of the operating member  101 , and the intermediate member  33  rotates with the rotating shaft  103  as its rotation center. Since the intermediate member  33  is pivotally connected with the connecting member  32  through the connecting shaft  36 , as the intermediate member  33  rotates, the intermediate member  33  will drive the connecting member  32  to move linearly along the axial direction of the connecting member  32 . In this way, the operating member  101 , the intermediate member  33  and the connecting member  32  together forms a transmission mechanism to convert the rotation of the operating mechanism  10  into the linear movement of the connecting member  32 , and to drive the first wedge  41  to move accordingly. 
     The first wedge  41  is connected to the connecting member  32  through the connecting seat  37 . The second wedge  42  is fixed on the first locking member  21  by welding or the like. The first wedge  41  is provided with a first wedge portion  411  facing inwards and having a thickness gradually increasing downwards, and an elongated slot  412  extending along the moving direction of the first wedge  41  is provided in the middle of the first wedge  41 . The second wedge  42  is provided with a second wedge portion  421  facing outwards and having a thickness gradually decreasing downwards, and two side walls  422  are formed by extending outwards from two opposite sides of the second wedge portion  421 . A through hole (not labelled) is provided in the middle of the second wedge portion  421 . The second wedge portion  421  and the two side walls  422  cooperatively form a guide groove for the first wedge  41  to move in the guide groove. 
     In this embodiment, the first locking member  21  is provided on the support assembly  3 , the second locking member  22  is provided on the base assembly  5 . In the active state, the first locking member  21  is unlocked with the second locking member  22  such that the support assembly  3  can rotate relative to the base assembly  5 , while in the locking state, the first locking member  21  is locked with the second locking member  22  such that the support assembly  3  cannot rotate relative to the base assembly  5 . For example, one of the first locking member  21  and the second locking member  22  may be provided with at least one protrusion  212 , the other of the first locking member  21  and the second locking member  22  may be provided with at least one insertion hole  222 , the at least one protrusion  212  corresponds to the at least one insertion hole  222  to form a concave-convex matching structure. In the active state, the at least one protrusion  212  is disengaged from the at least one insertion hole  222  such that the first locking member  21  is unlocked with the second locking member  22 , while in the locking state, the at least one protrusion  212  is engaged in the at least one insertion hole  222  such that the first locking member  21  is locked with the second locking member  22 . 
     Specifically, in this embodiment, the first locking member  21  is in a plate shape, including a first plate body  211  and a plurality of protrusions  212  (three in this embodiment) provided on the inner surface of the first plate body  211 . The middle of the first plate body  211  is provided with a through hole (not labelled), and the upper end of the first plate body  211  is fixedly provided with a limiting post  62 . The second locking member  22  is also in a plate shape, including a second plate body  221 . The middle of the second plate body  221  is also provided with a through hole (not labelled), and a plurality of insertion holes  222  (six in this embodiment) are provided in the second plate body  221  around the through hole. The protrusion  212  and the insertion hole  222  cooperatively form a concave-convex matching structure. When the treadmill is in the use state, the protrusion  212  is inserted into the insertion hole  222 , and the first locking member  21  and the second locking member  22  are in a fixed state so as to prevent the support assembly  3  from rotating relative to the base assembly  5  (as shown in  FIG.  15   ). Two sides of the upper end of the second plate body  221  are provided with a first limiting block  223  and a second limiting block  224 . The limiting post  62  cooperates with the first limiting block  223  and the second limiting block  224  to limit the rotation range of the support assembly  3  relative to the base assembly  5 , such that the support assembly  3  can only rotate and switch between the unfolding state and the folding state. 
     The compression spring  43  is used to exert a biasing force on the first locking member  21  so as to push the first locking member  21  outwards away from the second locking member  22 . However, in other embodiments, instead of the compression spring  43 , other forms of elastic members may also be used so long as the elastic member can exert a biasing force on the first locking member  21 . When the first wedge  41  is driven to move in a first direction (e.g., downwards) relative to the second wedge  42 , the biasing force drives the first locking member  21  to move away from the second locking member  22  such that the first locking member  21  is unlocked with the second locking member  22 , while when the first wedge  41  is driven to move in an opposite second direction (e.g., upwards) relative to the second wedge  42 , the first wedge  41  drives the second wedge  42  and the first locking member  21  to move towards the second locking member  22  such that the first locking member  21  is locked with the second locking member  22 . 
     The base assembly  5  is provided with a sleeve barrel  51  at the pivot position between the support assembly  3  and the base assembly  5 . The sleeve barrel  51  extends outwards from the base assembly  5 . The second locking member  22  is fixed to the outer end of the sleeve barrel  51  by, for example, welding. The compression spring  43  is placed inside the sleeve barrel  51 . The central shaft  53  sequentially passes through the middle of the compression spring  43 , the through hole of the second locking member  22 , the through hole of the first locking member  21 , the through hole of the second wedge  42  and the elongated slot  412  of the first wedge  41 , and finally the distal end of the central shaft  53  is fixed with a nut  54 . 
       FIGS.  13  to  16    are used to describe the positional relationship between relevant components when the interaction assembly  1  is transferred between the use state and the non-use state. When the interaction assembly  1  is transferred from the use state to the non-use state, the operating member  101  drives the connecting member  32  to move downward through the intermediate member  33 , and the connecting member  32  then drives the first wedge  41  to move downward. At this time, under the push of the compression spring  43 , the first locking member  21  and the second wedge  42  move outward away from the second locking member  22 , the protrusion  212  of the first locking member  21  is separated and disengaged from the insertion hole  222  of the second locking member  22  (as shown in  FIG.  16   ), such that the first locking member  21  is in an active state relative to the second locking member  22 , and at this time, the support assembly  3  can rotate relative to the base assembly  5 , that is, the support assembly  3  is in an unlocked state. On the contrary, when the interaction assembly  1  is transferred from the non-use state to the use state, the operating member  101  drives the connecting member  32  to move upward through the intermediate member  33 , and the connecting member  32  then drives the first wedge  41  to move upward. At this time, under the push of the first wedge  41 , the second wedge  42  and the first locking member  21  move inward towards the second locking member  22 , the protrusion  212  of the first locking member  21  is inserted into the insertion hole  222  of the second locking member  22  to form engagement (as shown in  FIG.  15   ), such that the first locking member  21  is in a locking state being locked with the second locking member  22 , and at this time, the support assembly  3  cannot rotate relative to the base assembly  5 , that is, the support assembly  3  is in a locked state. 
     In other embodiments, the first wedge  41  may also be provided with a first wedge portion facing inwards and having a thickness gradually decreasing downwards, while the second wedge  42  is provided with a second wedge portion facing outwards and having a thickness gradually increasing downwards. At the same time, in the process of changing the interaction assembly  1  from the use state to the non-use state, the operating member  10  is configured to drive the connecting member  32  and the first wedge  41  to move upward through the intermediate member  33 . In this situation, the first locking member  21  and the second wedge  42  will also move outward away from the second locking member  22  under the push of the compression spring  43  when the interaction assembly  1  is transferred from the use state to the non-use state, and the protrusion  212  is separated and disengaged from the insertion hole  222  to realize the unlocking between the support assembly  3  and the base assembly  5 . On the contrary, when the interaction assembly  1  is transferred from the non-use state to the use state, the operating member  10  will drive the connecting member  32  and the first wedge  41  to move downward through the intermediate member  33 , the second wedge  42  and the first locking member  21  will also move inward towards the second locking member  22  under the push of the first wedge  41 , and the protrusion  212  is inserted into the insertion hole  222  to form engagement to realize the locking between the support assembly  3  and the base assembly  5 . 
     In this embodiment, the first locking member  21  and the second locking member  22  form a locking mechanism  20 . The locking mechanism  20  is provided at a pivot position between the support assembly  3  and the base assembly  5 , wherein the first locking member  21  is provided on the support assembly  3 , and the second locking member  22  is provided on the base assembly  5 . The locking mechanism  20  can switch between an active state and a locking state. In the active state, the support assembly  3  can rotate relative to the base assembly  5 , and in the locking state, the support assembly  3  cannot rotate relative to the base assembly  5 , so as to realize unlocking or locking of the rotation between the support assembly  3  and the base assembly  5 . 
     In this embodiment, the connecting member  32 , the intermediate member  33  and the connecting seat  37  form a connecting mechanism  30 . The first wedge  41 , the second wedge  42  and the compression spring  43  form a driving mechanism  40 . The operating mechanism  10 , the connecting mechanism  30  and the driving mechanism  40  are connected sequentially to form a linkage, wherein the operating mechanism  10  is provided on the interaction assembly  1 , the connecting mechanism  30  is provided on the support assembly  3 , and the driving mechanism  40  is provided at the pivot position between the support assembly  3  and the base assembly  5 . When the interaction assembly  1  is rotated to switch from the use state to the non-use state, the connecting mechanism  30  is driven by the operating mechanism  10 , and then the driving mechanism  40  is driven by the connecting mechanism  30 , to enable the locking mechanism  20  to switch from the locking state to the active state, such that the support assembly  3  can rotate relative to the base assembly  5 . In this way, the linkage between the interaction assembly  1  and the support assembly  3  is realized, thereby making the operation simple, fast, safe and reliable. It is understood that, in other embodiments, the connecting seat  37  may also be omitted, that is, the first wedge  41  is directly connected to the lower end of the connecting rod  322 . 
     The interaction assembly  1 , the supporting pipe  312  and the base assembly  5  constitute the main contour of the treadmill. Protective elements (such as corrugated rubber tubes) can be added to the pivot positions between the interaction assembly  1  and the supporting pipe  312  and between the supporting pipe  312  and the base assembly  5  to protect the various components at the two pivot positions. It should be noted that the pulling portion  351  of the rotatable stopper  35  needs to be exposed outside in order for easy operation. 
     Of course, in other embodiments, the operating mechanism  10 , the connecting mechanism  30 , the driving mechanism  40  and the locking mechanism  20  can adopt other different structures. As long as the interaction assembly  1  is rotated to switch from the use state to the non-use state, the linkage between the interaction assembly  1  and the support assembly  3  can be realized, That is, the operating mechanism  10  can drive the connecting mechanism  30  and then the connecting mechanism  30  drives the driving mechanism  40 , to enable the locking mechanism  20  to switch from the locking state to the active state, such that the support assembly  3  can rotate relative to the base assembly  5 , the operation is simple, fast, safe and reliable. 
     As can be seen from the above description, by the linkage between the interaction assembly  1  and the support assembly  3 , when the interaction assembly  1  is rotated to switch from the use state to the non-use state, the operating mechanism  10  can drive the connecting mechanism  30  and then the connecting mechanism  30  drives the driving mechanism  40 , to enable the locking mechanism  20  to switch from the locking state to the active state, such that the support assembly  3  can rotate relative to the base assembly  5 . Thus, the rotation between the support assembly  3  and the base assembly  5  is unlocked or locked while rotating the interaction assembly  1 , and the folding operation of the treadmill is convenient, fast, safe and reliable. 
     In this description, the azimuth or positional relationship indicated by the terms “up”, “down”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside”, “outside”, “vertical”, “horizontal” is based on the azimuth or positional relationship shown in the accompanying drawings, only for the sake of clarity and convenience of description of the technical solution. Therefore, it cannot be understood as a limitation of the present invention. 
     In this description, the terms “first”, “second”, “third” and the like are only used to distinguish elements from each other, and cannot be understood as indicating or implying specific order or relative importance. 
     In this description, the terms “include”, “comprise”, or any other variation thereof are intended to cover non-exclusive inclusion, including not only those elements listed, but also other elements not explicitly listed. 
     The above is only the specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be defined by the appended claims.