Patent Publication Number: US-11654328-B2

Title: Treadmill

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims a priority of the Chinese patent application No. 202010535314.7 filed on Jun. 12, 2020, which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to the field of fitness equipment, in particular to a treadmill. 
     BACKGROUND 
     In the related art, most of foldable treadmills are manually folded partially or fully through a mechanical rod or a hydraulic structure. Usually, it is impossible to automatically fold a deck of the treadmill. A user needs to take great effort to push the deck to be in an erect, folded state, and then lock it with a security lock. The entire operation is very difficult and complicated. In addition, the deck is relatively heavy, and an accident may easily occur in the case of misoperation. Moreover, based on a foldable structure of the conventional treadmill, a chassis of the treadmill may still occupy a large space even when the deck is folded to be in the erect state. 
     In addition, usually for the conventional foldable treadmill, merely the deck is pushed to be in the erect, folded state, but a handrail and a panel meter are fixedly mounted on a stand column. When the deck is being folded, the deck is related relative to the stand column and then erected. At this time, the handrail and the panel meter on the stand column are still in a fixed state and are not gathered. 
     Based on the above, even if the treadmill is in the folded state, the handrail and the chassis of the treadmill may still occupy a large space, and the entire appearance is not good. 
     Hence, there is an urgent need to provide a new treadmill to solve the above-mentioned problems. 
     SUMMARY 
     An object of the present disclosure is to provide a treadmill, so as to solve, or at least relieve, at least one of the above-mentioned problems. 
     The present disclosure provides in some embodiments a treadmill, including a chassis, stand columns mounted at both sides of the chassis, a deck rotatably mounted on the chassis and configured to rotate relative to the chassis to a longitudinal direction or a horizontal direction, a handrail assembly rotatably mounted on the stand columns and configured to rotate relative to the stand columns to a folded state or an unfolded state, and a controller configured to control rotation of the deck and the handrail assembly. The controller is configured to control the deck to rotate to the longitudinal direction when the controller controls the handrail assembly to rotate relative to the stand columns to be in the folded state, and control the handrail assembly to rotate relative to the stand columns to be in the unfolded state when the controller controls the deck to rotate from the longitudinal direction to the horizontal direction. 
     In a possible embodiment of the present disclosure, each stand column is rotatably connected to the chassis and configured to rotate by a predetermined angle relative to the chassis. Each stand column is oriented in a predetermined direction angled relative to the longitudinal direction at the predetermined angle when the deck is oriented in the horizontal direction. When the controller controls the deck to rotate to the longitudinal direction and the deck has rotated from the horizontal direction to the predetermined direction, the deck is configured to drive the stand columns and the handrail assembly on the stand columns to rotate synchronously by the predetermined angle to the vertical direction. 
     In a possible embodiment of the present disclosure, the treadmill further includes a handrail motor coupled to the handrail assembly and configured to drive the handrail assembly to rotate, and a pushrod motor coupled to the deck and configured to drive the deck to rotate. The controller includes a first control panel coupled to the handrail motor and configured to control the handrail motor so that the handrail motor drives the handrail assembly to rotate, and a second control panel coupled to the first control panel and the pushrod motor and configured to control the pushrod motor so that the pushrod motor drives the deck to rotate. 
     In a possible embodiment of the present disclosure, the treadmill further includes a first sensor coupled to the controller and configured to detect whether there is a human body spaced apart from the treadmill by a predetermined distance when the deck rotates, and when there is the human body spaced apart from the treadmill by the predetermined distance, transmit a corresponding electric signal to the controller so that the controller controls the deck to stop rotating. 
     In a possible embodiment of the present disclosure, the first sensor is further configured to, when there is no human body spaced apart from the treadmill by the predetermined distance, transmit the first electric signal to the controller, and the controller is further configured to wait a predetermined time period and control the deck to rotate continuously upon the receipt of the first electric signal. 
     In a possible embodiment of the present disclosure, the treadmill further includes a second sensor coupled to the controller and configured to detect whether the treadmill is in a stable state when the deck rotates, and when the treadmill is in an unstable state, transmit a second electric signal to the controller so that the controller controls the deck to stop rotating. 
     In a possible embodiment of the present disclosure, the treadmill further includes a microphone configured to receive a voice command, and a voice controller coupled to the microphone and the controller and configured to parse the voice command received by the microphone and transmit the parsed voice command to the controller so that the controller controls the treadmill in accordance with the parsed voice command. 
     In a possible embodiment of the present disclosure, a support plate is arranged at an upper end of each stand column. The handrail assembly includes a handrail mounted on the support plate and configured to rotate relative to the support plate, and a panel including a panel bracket. A toothed disc is secured onto the panel bracket, rotatably connected to the support plate, and configured to drive the panel bracket and the panel to rotate relative to the support plate. The handrail motor is fixedly mounted on the handrail, connected to the toothed disc, and configured to drive the handrail and the toothed disc to rotate in opposite directions. 
     In a possible embodiment of the present disclosure, an arc-like stopping hole is provided in the support plate, and a stopping rod is fixedly mounted on the handrail. When the handrail rotates relative to the support plate, the stopping rod is configured to move along the stopping hole to abut against any one of two ends of the stopping hole. 
     In a possible embodiment of the present disclosure, a stopping stud is fixedly mounted on the support plate, and a first stopping groove is formed in the toothed disc. When the toothed disc rotates relative to the support plate, the stopping stud is configured to move along the first stopping groove to abut against any one of two ends of the first stopping groove. 
     In a possible embodiment of the present disclosure, the chassis includes a fixed bracket, and a telescopic bracket slidably mounted on the fixed bracket and configured to move horizontally relative to the fixed bracket. The deck is rotatably mounted on the fixed bracket and connected to the telescopic bracket through a connection rod. The telescopic rod is configured to drive the deck to rotate relative to the fixed bracket through the connection rod when the telescopic rod moves horizontally relative to the fixed bracket. 
     In a possible embodiment of the present disclosure, the pushrod motor is fixedly mounted on the fixed bracket, connected to the telescopic bracket, and configured to drive the telescopic bracket to move horizontally relative to the fixed bracket. 
     In a possible embodiment of the present disclosure, a fixed plate is arranged on the chassis, a second stopping groove is provided in the fixed plate, a rotation groove is provided in the deck, and the stand column is provided with a stopping shaft. The stopping shaft penetrates through the second stopping groove into the rotation groove, and is configured to rotate relative to the second stopping groove and the rotation groove. When the deck rotates from the horizontal direction to the predetermined direction relative to the stand column and the stopping shaft, the stopping shaft moves from a first end of the rotation groove to a second end of the rotation groove and abuts against the second end, so that the deck pushes the stand column to rotate synchronously. When the deck pushes the stand column to rotate from the predetermined direction to the longitudinal direction, the stopping shaft rotates from the first end of the second stopping groove to the second end of the second stopping groove. 
     According to the embodiments of the present disclosure, the treadmill includes the chassis, the deck, the stand columns, the handrail assembly and the controller. The deck is capable of rotating relative to the chassis to be in the folded state in the longitudinal direction or the unfolded state in the horizontal direction. The handrail assembly is capable of rotating relative to the stand column to be in the folded state or the unfolded state, and the stand column is capable of rotating to the longitudinal direction. When the controller controls the deck to rotate to be in the folded state in the longitudinal direction, the handrail assembly and the stand column may also rotate to the longitudinal direction under the effect of the deck, and at this time the handrail assembly may also be in the folded state. As a result, through the cooperation of a control assembly and a structural assembly, it is able to rotate the deck, the handrail assembly and the stand columns to the horizontal direction and fold the entire treadmill, thereby to provide a more compact structure after the folding, reduce a space occupied by the folded treadmill, and automatically fold the deck. 
     Further, through the stopping structures, it is able to rotate the deck, the stand columns and the handrail assembly stably during the folding, and automatically lock them at corresponding positions stably, thereby to improve the stability of the entire treadmill in the folded or unfolded state, and improve the security. 
     In addition, the chassis may include the fixed bracket and the telescopic bracket capable of horizontally sliding relative to the fixed bracket. The telescopic bracket may be driven to slide along the fixed bracket, so as to drive the deck to rotate relative to the fixed bracket to the longitudinal direction. Based on the above, when the deck rotates to be in the folded state in the longitudinal direction, the telescopic bracket may also contract relative to the fixed bracket, so as to dynamically adjust a center of gravity and ensure the stability of the deck when folding the deck, and reduce a space occupied by the deck in the folded state. Moreover, when the deck rotates to be in the unfolded state in the horizontal direction, the telescopic bracket may stretch relative to the fixed bracket, so as to stably support the deck and improve the stability of the treadmill. 
     The above description is merely an overview of the schemes in the embodiments of the present disclosure, and the schemes may be implemented in accordance with contents involved in the description so as to enable a person skilled in the art to understand the technical means of the present disclosure in a clearer manner. In order to make the objects, the technical solutions and the advantages of the present disclosure more apparent, the present disclosure will be described hereinafter in a clear and complete manner in conjunction with the drawings and embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to achieve the above and related objects, some descriptive aspects will be described in conjunction with the following description and drawings, and these aspects indicate various ways capable of practicing a principle of the present disclosure. All aspects and equivalent aspects thereof shall fall within the scope of the present disclosure. The above and other objects, features and advantages will become more apparent on the basis of the drawings in conjunction with the following description. Same reference signs represent a same component or element. 
         FIG.  1    is a schematic view showing a treadmill  100  in an unfolded state according to one embodiment of the present disclosure; 
         FIG.  2    is a schematic view showing the treadmill  100  in the folded state according to one embodiment of the present disclosure; 
         FIG.  3    is a schematic view showing a structure consisting of a stand column  120 , a deck  150  and a chassis  110  according to one embodiment of the present disclosure; 
         FIG.  4    is an enlarged view of A in  FIG.  3   ; 
         FIGS.  5  and  6    are exploded views of a handrail assembly  130  according to one embodiment of the present disclosure; 
         FIG.  7    is an exploded view of the deck  150  and a back plate  190  according to one embodiment of the present disclosure; 
         FIG.  8    is an exploded view of the back plate  190  according to one embodiment of the present disclosure; and 
         FIG.  9    is a sectional view of a structure consisting of a protrusion  152  and a fastener  192  according to one embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure will be described hereinafter in more details in conjunction with the drawings and embodiments. The following embodiments are for illustrative purposes only, but shall not be used to limit the scope of the present disclosure. In contrast, the following embodiments are provided so as to facilitate the understanding of the present disclosure. 
     In order to solve the problems in a conventional treadmill, the present disclosure provides in some embodiments a treadmill  100  which is capable of being folded or unfolded automatically, so as to reduce a space occupied by the treadmill in a folded state.  FIG.  1    shows the treadmill  100  in an unfolded state, and  FIG.  2    shows the treadmill  100  in the folded state. 
     As shown in  FIGS.  1  and  2   , the treadmill  100  includes a chassis  110 , a deck  150 , and two stand columns  120  arranged at two sides of the chassis  110  and the deck  150 . A lower end of the deck  150  is rotatably mounted on a front end of the chassis  110 , and the deck  150  may rotate relative to the chassis  110  to a longitudinal direction or a horizontal direction. 
     The two stand columns  120  may be rotatably connected to the front end of the chassis  110 , and rotate relative to the chassis  110  by a predetermined angle. To be specific, as shown in  FIG.  2   , each stand column  120  may be oriented in the longitudinal direction. As shown in  FIG.  1   , each stand column  120  may be oriented in a predetermined direction angled relative to the longitudinal direction by a predetermined angle. Here, the predetermined angle and an angle by which the stand column  120  relative to the chassis will not be particularly defined herein. 
     In addition, the treadmill  100  further includes a handrail assembly  130  arranged on an upper end of each stand column  120 . The handrail assembly  130  may be rotatably mounted on the stand column  120 , and rotate relative to the stand column  120  to be in the folded state or the unfolded state. To be specific, as shown in  FIG.  2   , when the treadmill  100  is in the folded state, the handrail assembly  130  may rotate to be in the folded state, and as shown in  FIG.  1   , when the treadmill  100  is in the unfolded state, the handrail assembly  130  may rotate to be in the unfolded state. 
     In other words, in the embodiments of the present disclosure, when the treadmill  100  is in the unfolded state, the deck  150  may be oriented in the horizontal direction, each stand column  120  may be oriented in the predetermined direction angled relative to the longitudinal direction by the predetermined angle, and the handrail assembly  130  may be in the folded state. When the treadmill  100  is in the folded state, the deck  150  and the stand columns  120  may be oriented in the longitudinal direction, and the handrail assembly  130  may be in the unfolded state. 
     In a possible embodiment of the present disclosure, the treadmill  100  further includes a controller  160  configured to control structural components of the treadmill  100 . The controller  160  may control rotation of the deck  150  and the handrail assembly  130 , so as to automatically fold or unfold the treadmill  100 . Here, a position of the controller  160  will not be particularly defined. 
     To be specific, when the treadmill  100  is to be automatically folded (i.e., the treadmill  100  is to be switched from the unfolded state to the folded state), the controller  160  may control the handrail assembly  130  to rotate relative to the stand column  120  to be in the folded state, and at this time, the stand column  120  may be always oriented in the predetermined direction angled relative to the longitudinal direction by the predetermined angle. Then, the controller may control the deck  150  to rotate from the horizontal direction to the longitudinal direction. Here, it should be appreciated that, when the controller  160  controls the deck  150  to rotate to the longitudinal direction and the deck  150  has rotated from the horizontal direction to the predetermined direction where the stand column  120  is oriented, the deck  150  may drive the stand column  120  and the handrail assembly  130  on the stand column  120  to rotate synchronously by the predetermined angle to the longitudinal direction. 
     When the treadmill  100  is to be automatically unfolded, the controller  160  may control the deck  150  to rotate from the longitudinal direction to the horizontal direction, and then control the handrail assembly  130  to rotate relative to the stand column  120  to be in the unfolded state. Here, it should be appreciated that, when the deck  150  rotates from the longitudinal direction to the predetermined direction, the stand column  120  may drive the handrail assembly  130  to rotate synchronously to the predetermined direction, and at this time the handrail assembly  130  may be always in the folded state. In addition, the stand column  120  may be fixed at a position in the predetermined direction and may not rotate any more, and the deck  150  may rotate continuously rotate from the predetermined direction to the horizontal direction. After the deck  150  has rotated to the horizontal direction, the controller  160  may control the handrail assembly  130  (on the stand column  120  in the predetermined direction) to rotate relative to the stand column  120 , so as to be switched from the folded state to the unfolded state. 
     In a possible embodiment of the present disclosure, as shown in  FIG.  2   , when the handrail assembly  130  is in the folded state, it may be oriented in a same direction as the stand column  120 , i.e., it may overlap the stand column  120 , so as to reduce the space occupied by the treadmill  100  in the folded state. 
       FIGS.  5  and  6    are exploded views of the handrail assembly  130  according to one embodiment of the present disclosure. 
     As shown in  FIGS.  5  and  6   , a support plate  121  is fixedly mounted on the upper end of the stand column  120 , and the handrail assembly  130  is mounted on the support plate  121  and may rotate relative to the support plate  121 . 
     The handrail assembly  130  includes a handrail  131  and a panel  136 , and the handrail  131  is rotatably connected to the support plate  121 . The panel  136  includes a panel bracket  137 , and a toothed disc  138  is fixedly mounted on the panel bracket  137  and rotatably connected to the support plate  121  through the toothed disc  138 . When the toothed disc  138  rotates relative to the support plate  121 , it may drive the panel bracket  137  and the panel  136  to rotate relative to the support plate  121 . Here, a specific structure for rotatably connecting the handrail  131  and the toothed disc  138  to the support plate  121  will not be particularly defined herein. In a possible embodiment of the present disclosure, the handrail  131  and the toothed disc  138  may be rotatably connected to the support plate  121  through a locking member  125 . Through the locking member  125 , the handrail  131  and the panel  136  may be mounted at both sides of the support plate  121  respectively. 
     It should be appreciated that, the panel  136  and the handrail  131  may rotate relative to the support plate  121  in opposite directions, so as to move close to or away from each other, i.e., to enable the handrail assembly  130  to be in the folded state or the unfolded state. 
     In a possible embodiment of the present disclosure, the treadmill  100  includes a handrail motor  135  and a pushrod motor  155 . The handrail motor  135  is coupled to the handrail assembly  130 , and configured to drive the handrail assembly  130  to rotate. The pushrod motor  155  is coupled to the deck  150 , and configured to drive the deck  150  to rotate. In addition, the handrail motor  135  and the pushrod  155  are coupled to the controller  160 , so that the controller  160  controls the handrail motor  135  to control the rotation of the handrail assembly  130  (i.e., control the panel  136  and the handrail  131  to rotate in opposite directions relative to the support plate  121 ), and controls the pushrod  155  to control the rotation of the deck  150 . 
     To be specific, as shown in  FIGS.  5  and  6   , the handrail motor  135  is fixedly mounted on the handrail  131 , and connected to the toothed disc  138 . The toothed disc  138  is provided with teeth  139  arranged along an arc, and the handrail motor  135  includes a gear shaft  133  which penetrates through an avoidance hole  126  in the support plate  121  in an axial direction and engages with the teeth  139  on the toothed disc  138 . When the handrail motor  135  drives the handrail  131  to rotate relative to the support plate  121 , through the engagement of the gear shaft  133  with the teeth  139  on the tooted disc, the toothed disc  138  may be driven to rotate in an opposite direction. In other words, the handrail motor  135  may drive the handrail  131  and the toothed disc  138  to rotate in opposite directions. The controller  160  may control the handrail motor  135 , so as to control the handrail  131  and the panel  136  to rotate relative to the support plate  121  in opposite directions to move close to or move away from each other. 
     In a possible embodiment of the present disclosure, as shown in  FIGS.  5  and  6   , an arc-like stopping hole  122  is provided in the support plate  121 , and a stopping rod  132  adapted to the stopping hole  122  is fixedly provided on the handrail  131 . The stopping rod  132  is fixedly arranged at an end surface of the handrail  131  opposite to the support plate, extends along a direction perpendicular to the support plate  121  (a direction parallel to an axis direction of the support plate  121 ), and passes through the stopping hole  122  in the support plate  121 . When the handrail  131  rotates relative to the support plate  121 , the stopping rod  132  may move along the stopping hole  122 . When the stopping rod  132  moves to abut against any one of two ends of the stopping hole  122 , the stopping rod  132  may stop, and the handrail  131  may not rotate relative to the support plate  121  and may stop at the position. 
     In a possible embodiment of the present disclosure, as shown in  FIGS.  5  and  6   , a stopping stud  124  is further fixedly mounted on the support plate  121 , and a first stopping groove  134  adapted to the stopping stud  124  is provide din the toothed disc  138 . When the toothed disc  138  rotates relative to the support plate  121 , the stopping stud  124  on the support plate  121  may rotate relative to the toothed disc  138  and move along the first stopping groove  134  in the toothed disc  138 . When the stopping stud  124  moves to abut against any one of two ends of the first stopping groove  134 , the stopping stud  124  may be stopped, and thereby the rotation of the support plate  121  relative to the toothed disc  138  may be limited. At this time, the toothed disc  138  and the panel  136  may not rotate relative to the support plate  121  any more and may stop at the position. In a possible embodiment of the present disclosure, the first stopping groove  134  is formed in a peripheral portion of the toothed disc  138 , i.e., it is a notch formed in the peripheral portion of the toothed disc  138 . 
     When the handrail assembly  130  is in the folded state, the handrail  131  and panel  136  may rotate to a direction in alignment with the stand column  120 , and an angle between the handrail  131  and the stand column  120  and an angle between the panel  136  and the stand column  120  (the support plate  121 ) may each be 0°. At this time, the stopping rod  132  on the handrail  131  may rotate to abut against a first end of the stopping hole  113  in the support plate  121 , so as to prevent the handrail  131  from rotating relative to the support plate  121 , and stop the handrail  131  at the position. In addition, the stopping stud  124  on the support plate  121  may rotate to abut against a first end of the first stopping groove  134  in the toothed disc  138 , so as to prevent the rotation of the support plate  121  relative to the toothed disc  138  and stop the toothed disc  138  and the panel  136  at the corresponding positions. 
     When the handrail assembly  130  is in the unfolded state, i.e., when the handrail  131  and the panel  136  rotate to move away from each other (in the opposite directions), the handrail  131  and the panel  136  may each rotate to a position angled relative to the stand column  120  (the support plate  121 ) at a certain angle. At this time, the stopping rod  132  on the handrail  131  may rotate to abut against a second end of the stopping hole  113  in the support plate  121 , so as to prevent the handrail  131  from rotating relative to the support plate  121  and stop the handrail  131  at the position. In addition, the stopping stud  124  on the support plate  121  may rotate to abut against a second end of the first stopping groove  134  in the toothed disc  138 , so as to prevent the rotation of the support plate  121  relative to the toothed disc  138  and stop the toothed disc  138  and the panel  136  at the corresponding positions. Here, an angle between the handrail  131  and the stand column  120  and an angle between the panel  136  and the stand column  120  in the unfolded state will not be particularly defined herein, and they may be set according to the practical needs and an ergonomics requirement. 
     Through the above-mentioned stopping structure, the handrail  131  and the panel  136  may be in the folded state or the unfolded state stably. In this way, no matter whether the treadmill is in the folded state or the unfolded state, it is able to ensure the stability of the entire treadmill. In addition, when the treadmill is in the folded state, the panel  136  and the handrail  131  may move close to each other to be in alignment with the stand column  120 , so as to reduce the space occupied by the treadmill in the folded state and improve the appearance thereof. 
       FIGS.  3  and  4    show a structure consisting of the stand column  120 , the deck  150  and the chassis  110  according to one embodiment of the present disclosure. 
     As shown in  FIGS.  3  and  4   , the chassis  110  includes a fixed bracket  111  and a telescopic bracket  116 . The telescopic bracket  116  is slidably mounted on the fixed bracket  111 , and may move horizontally relative to the fixed bracket  111 . The deck  150  and the stand column  120  may be rotatably mounted on the fixed bracket  111 . 
     In a possible embodiment of the present disclosure, as shown in  FIG.  4   , fixed plates  112  are arranged at two sides of a front end of the fixed bracket  111 , and two sides of the front end of the deck  150  are rotatably connected to the two fixed plates  112  via connection shafts  115 , so as to rotatably mount the deck  150  between the two fixed plates  112 . A lower end of each stand column  120  is rotatably connected to the corresponding fixed plate  112  through the connection shaft  115 , so that the stand column  120  may rotate to the longitudinal direction or the predetermined direction relative to the fixed plate  112 . 
     The deck  150  is connected to the telescopic bracket  116  through a connection rod  156 , and two ends of the connection rod  156  are pivotally connected to the deck  150  and the telescopic bracket  116  respectively. In this way, when the telescopic bracket  116  moves horizontally relative to the fixed bracket  111 , the deck  150  may be driven to rotate relative to the fixed bracket  111  and the fixed plate  112  through the connection rod  156 , and the deck  150  may be driven to rotate to the longitudinal direction or the horizontal direction relative to the fixed bracket  111  and the fixed plate  112 , so as to enable the treadmill to be in the folded state or the unfolded state. To be specific, when the telescopic bracket  116  moves horizontally in a direction close to the fixed bracket  111 , the deck  150  may be driven to rotate to the longitudinal direction relative to the fixed bracket  111 , and when the telescopic bracket  116  moves horizontally in a direction away from the fixed bracket  111 , the deck  150  may be driven to rotate to the horizontal direction relative to the fixed bracket  111 . 
     In a possible embodiment of the present disclosure, as shown in  FIG.  2   , the pushrod motor  155  is fixedly mounted on the fixed bracket  111 , and connected to the telescopic bracket  116 . The controller  160  may control the pushrod motor  155  to drive the telescopic bracket  116  to move horizontally relative to the fixed bracket  111 , so as to drive the deck  150  to rotate relative to the fixed bracket  111  and the fixed plate  112  through the connection rod  156 . In other words, in the embodiments of the present disclosure, the controller  160  may control the pushrod motor  155  to drive the telescopic bracket  116  to move, so as to control the rotation of the deck  150  relative to the chassis  110 . 
     Based on the above, when the deck  150  rotates to be in the folded state in the longitudinal direction, the telescopic bracket  116  may contract relative to the fixed bracket  111 , so as to dynamically adjust the center of gravity of the deck  150  during the folding, ensure the stability of the deck  150 , and reduce the space occupied by the deck  150  in the folded state. When the deck  150  rotates to be in the unfolded state in the horizontal direction, the telescopic bracket  116  may stretch relative to the fixed bracket  111 , so as to stably support the deck  150  and improve the stability of the treadmill  100  in use. 
     In a possible embodiment of the present disclosure, as shown in  FIGS.  3  and  4   , a second stopping groove  113  is provided in the fixed plate  112 , a rotation groove  153  is provided in the deck  150 , and a stopping shaft  123  is provided at the lower end of the stand column  120 . The stopping shaft  123  penetrates through the second stopping groove  113  in the fixed plate  112  into the rotation groove  153  in the deck  150 . The stopping shaft  123  may rotate relative to the second stopping groove  113  and the rotation groove  153 . 
     To be specific, when the deck  150  rotates from the horizontal direction to the predetermined direction, it may rotate relative to the stand column  120  and the stopping shaft  123  on the stand column, so the stopping shaft  123  may move relative to the rotation groove  153 . In addition, when the deck  150  has rotated from the horizontal direction to the predetermined direction, the stopping shaft  123  may just move from a first end of the rotation groove  153  to a second end of the rotation groove  153  and abut against the second end (at this time, the deck  150  and the stand column  120  may be both oriented in the predetermined direction). In this way. When the deck  150  continuously rotates from the predetermined direction to the longitudinal direction, the stand column  120  may be stopped from rotating relative to the deck  150  because the stopping shaft abuts against the second end of the rotation groove  153 , and thereby the deck  150  may push the stand column  120  to rotate to the longitudinal direction through the second end of the rotation groove  153 . 
     When the deck  150  pushes the stand column  120  to rotate from the predetermined direction to the longitudinal direction, the stand column  120  and the stopping shaft  123  on the stand column may rotate relative to the fixed plate  112 , so the stopping shaft  123  may move relative to the second stopping groove  113 . In addition, when the deck  150  pushes the stand column  120  to rotate from the predetermined direction to the longitudinal direction, the stopping shaft  123  on the stand column  120  may just rotate from a first end of the second stopping groove  113  to a second end of the second stopping groove  113 . In this way, the stand column  120  may be stopped from rotating relative to the fixed plate  112  because the stopping shaft  123  on the stand column  120  abuts against the second end of the second stopping groove  113 , and the stand column  120  may be stopped at the position, i.e., the stand column  120  may be locked to be oriented in the longitudinal direction. 
     It should be appreciated that, when the stand column  120  rotates to the longitudinal direction, the stopping shaft  123  on the stand column  120  may abut against the second end of the rotation groove  153  (a front end of the rotation groove  153 ) and abut against the second end of the second stopping groove  113  (a rear end of the second stopping groove  113 ), so as to stably lock the stand column  120  to be oriented in the longitudinal direction and prevent the stand column  120  from rotating relative to the fixed plate  112 . When the stopping shaft  123  abuts against the second end of the rotation groove  153 , the deck  150  may not rotate relative to the fixed plate  112  any more, i.e., the deck  150  may also be locked to be oriented in the longitudinal direction. Hence, according to the embodiments of the present disclosure, through the cooperation of the stopping shaft  123  on the stand column  120  with the rotation groove  153  in the deck  150  and the second stopping groove  113  in the fixed plate  112 , it is able to automatically lock the deck  150  and the stand column  120  to be oriented in the longitudinal direction during the folding in a stable and reliable manner, thereby to improve the security. 
     In a possible embodiment of the present disclosure, the controller  160  includes a first control panel  161  and a second control panel  162  electrically connected to the first control panel  161 . As shown in  FIG.  1   , the first control panel  161  is arranged in the panel  136  and coupled to the handrail motor  135 . The first control panel  161  is configured to control the handrail motor  135  to drive the handrail assembly  130  to rotate or stop rotating. As shown in  FIG.  2   , the second control panel  162  is mounted on the chassis  110  and coupled to the pushrod motor  155 . The second control panel  162  is configured to control the pushrod motor  155  to drive the deck  150  to rotate or stop rotating. 
     In a possible embodiment of the present disclosure, a voice controller  182 , a microphone  183  and a loudspeaker  184  are arranged in the panel  136  and coupled to the controller  160  (the first control panel  161 ), and the microphone  183  is coupled to the voice controller  182 . In this way, a user may control a running state of the treadmill  100  through a voice command. To be specific, after a voice command is given by the user, the microphone  183  may receive the voice command and transmit it to the voice controller  182 . The voice controller  182  may parse the voice command, and transmit a parsed command to the controller  160  (the first control panel  161 ). Then, the controller  160  may control corresponding components of the treadmill in accordance with the command. 
     In addition, the panel  136  is further provides with a button (not shown) coupled to the first control panel  161  of the controller  160 . When the button is pressed by the user, a folding command may be transmitted to the controller  160  (the first control panel  161 ), and the controller  160  may control the treadmill  100  to be automatically folded in accordance with the folding command. 
     In a possible embodiment of the present disclosure, the controller  160  may be in wireless communication with a mobile terminal, e.g., through Bluetooth or WiFi. An application for transmitting a signal to the controller  160  may be provided in the mobile terminal, so that the user may transmit a command to the controller  160  through the application. 
     It should be appreciated that, when the treadmill  100  needs to be folded or unfolded, the voice command may be transmitted to the controller  160  through the microphone  183  and the voice controller  182 , or the command may be transmitted to the controller  160  through the button, or the command may be transmitted to the controller  160  through the application in the mobile terminal. To be specific, regardless of the voice command or the command transmitted through the button, they may be transmitted to the first control panel  161  and then the first control panel  161  may transmit a corresponding signal to the handrail motor  136  coupled thereto, so as to control the handrail motor  135  to drive the handrail  131  and the panel  136  to rotate to be in the folded state. In addition, the first control panel  161  may transmit a signal to the second control panel  162 , and the second control panel  162  may control the pushrod motor  155  to drive the telescopic bracket  116  to move relative to the fixed bracket  111  and drive the deck  150  to rotate to the longitudinal direction, thereby enable the treadmill  100  to be in the folded state. 
     In a possible embodiment of the present disclosure, the treadmill  100  further includes a first sensor  171  and a second sensor (not shown) both coupled to the controller  160 . Here, positions of the first sensor  171  and the second sensor on the treadmill will not be particularly defined herein, as long as a detection function may be achieved. 
     The first sensor  171  may detect whether there is a human body spaced apart from the treadmill  100  by a predetermined distance wen the treadmill  100  is to be in the folded or unfolded state and the deck  150  and the handrail assembly  130  rotate, and when there is the human body spaced apart from the treadmill  100  by the predetermined distance, transmit a corresponding first electric signal to the controller  160  (the first control panel  161 ). Upon the receipt of the first electric signal indicating that there is the human body surrounding the treadmill, the controller  160  may control the pushrod  155  to stop, so as to stop the rotation of the deck  150 , i.e., temporarily stop the deck  150  from being folded or unfolded. 
     When there is no human body spaced apart from the treadmill  100  by the predetermined distance, the first sensor  171  may transmit a corresponding second electric signal to the controller  160 . Upon the receipt of the second electric signal indicating that there is no human body surrounding the treadmill, the controller  160  may wait a predetermined time period, and then control the pushrod motor  155  to start so as to control the deck  150  to rotate continuously, thereby to enable the treadmill  100  to be in the folded or unfolded state. 
     In a possible embodiment of the present disclosure, as shown in  FIG.  2   , two first sensors  171  may be arranged at two ends of the chassis  110  respectively, and the first sensor  171  may be, but not limited, a pyroelectric infrared sensor. 
     The second sensor may detect whether the treadmill  100  is in a stable state when the treadmill is to be in the folded or unfolded state (i.e., when the deck  150  and the handrail assembly  130  rotate), and when the treadmill  100  is in an unstable state, transmit a corresponding third electric signal to the controller  160 . Upon the receipt of the third electric signal, the controller  160  may control the pushrod motor  155  to stop, so as to control the deck  150  to stop rotating, i.e., to temporarily stop the deck  150  from being folded or unfolded. In addition, when the treadmill  100  is in the stable state again, the second sensor may transmit a corresponding fourth electric signal to the controller  160 . Upon the receipt of the fourth electric signal, the controller  160  may transmit a corresponding command to indicate the user to perform a corresponding operation, so as to control the deck  150  to rotate continuously, thereby to enable the treadmill  100  to be in the folded or unfolded state. 
     In a possible embodiment of the present disclosure, the second sensor may be coupled to the first control panel  161 , and it may be, but not limited to, an acceleration sensor. 
     In a possible embodiment of the present disclosure, the panel  136  is further provided with a control button  181  coupled to the controller  160  (the first control panel  161 ) and protruding out of a housing of the panel  136 . The user may operate the control button  181  to control the running state of the treadmill  100 . To be specific, when the control button  181  is operated by the user, a corresponding command may be transmitted to the controller  160 , and the controller  160  may control the running state of the treadmill  100 , e.g., a belt motor  158  may be controlled so as to stop or start a belt or control a rotation speed of the belt. 
     In addition, an emergency button  137  is further arranged at a low side of the panel  136 . In an unexpected situation, the emergency button may be pressed to transmit a command to the controller  160 , so as to stop a corresponding motor. 
     In the conventional treadmill, no back plate for shielding is provided at the bottom of the deck, and an internal structure of the deck is directly exposed to the outside, so the internal structure is not protected, and the appearance of the treadmill is adversely affected. In a possible embodiment of the present disclosure, the treadmill  100  further includes a back plate  190 . 
       FIG.  7    is an exploded view of the deck  150  and the back plate  190  according to one embodiment of the present disclosure,  FIG.  8    is an exploded view of the back plate  190  according to one embodiment of the present disclosure, and  FIG.  9    is a sectional view of a structure consisting of a protrusion  152  and a fastener  192  according to one embodiment of the present disclosure. 
     As shown in  FIGS.  7  to  9   , apart from the above-mentioned members such as the deck  150 , the treadmill  100  further includes the back plate  190  mounted on the deck  150 . The treadmill  100  in  FIG.  7    is in the folded state. The back plate  190  is detachably mounted at a back surface of the deck  150 . Through the back plate  190 , it is able to shield the internal structure of the deck  150 . In this way, when the deck  150  rotates to be in the folded state, it is able to improve the appearance of the treadmill. 
     In a possible embodiment of the present disclosure, the back plate  190  further includes a base plate  191 , and a decorative layer  193  is arranged on the base plate  191 . Here, the decorative layer  193  may be a cloth made of different materials and having different patterns, or a coating, which will not be particularly defined herein. It should be appreciated that, the back plate  190  may be moved from the deck  150 , and then the decorative layer  193  may be replaced, so as to be adapted to different environments. 
     It should be appreciated that, a structure for connecting the back plate  190  and the deck  150  will not be particularly defined herein, and any known structure capable of detachably connecting the back plate  190  and the deck  150  shall fall within the scope of the present disclosure. 
     In a possible embodiment of the present disclosure, the back plate  190  includes the base plate  191  and the fastener  192  mounted on the base plate  191 . The protrusion  152  adapted to the fastener  192  is provided at the back surface of the deck  150 . Through the connection of the fastener  192  with the protrusion  152  in a snap-fit manner, the back plate  190  and the base plate  191  may be fixedly mounted on the back surface of the deck  150 . In addition, when the fastener  192  is detached from the protrusion  152 , the back plate  190  and the base plate  191  may be removed from the deck  150 . In this way. It is able for the back plate  190  to be detachably connected to the deck  150 . 
     Further, as shown in  FIG.  7   , two footrest plates  151  are arranged at two sides of the deck  150  respectively, the protrusion  152  is provided at the bottom of each footrest plate  151 , and the fastener  192  adapted to the protrusion  152  is arranged at each side of the base plate  191 . Through the cooperation of the fastener  192  and the corresponding protrusion  152 , it is able to firmly mount the back plate  190  and the base plate  191  on the back surface of the deck  150 . Here, shapes and structures of the fastener  192  and the protrusion  152  will not be particularly defined herein, as long as they may be detachably connected to each other. 
     In a possible embodiment of the present disclosure, the fastener  192  may be made of resilient plastics. As shown in  FIG.  9   , the protrusion  152  has a drop shape with two narrow ends and a wide middle portion. The fastener  192  includes a cup-like member  194  matching the protrusion  152 , with one end being opened and the other end being closed. In addition, the two ends of the cup-like member  194  are narrow, and a middle portion of the cup-like member  194  is wide. When the fastener  192  is connected to the protrusion  152 , an outer wall of the protrusion  152  may abut against an inner wall of the cup-like member  194 . In addition, due to the narrow opened end of the cup-like member  194 , it is able to prevent the cup-like member  194  from falling off from the protrusion  152  easily, thereby to improve the stability of the entire structure. 
     It should be appreciated that, because the fastener  192  is made of plastics, during the removal of the back plate  190 , the opened end of the cup-like member  194  may be pulled outward to remove the fastener  192  from the protrusion  152 , thereby to remove the back plate  190  from the deck  150 . 
     It should be further appreciated that, the fastener  192  may include one or more cup-like members  194 , and correspondingly, the footrest plate  151  may be provided with one or more protrusions  152 . Here, the arrangement of the cup-like members  194  and the protrusions  152  will not be particularly defined herein, as long as the back plate  190  may be firmly mounted on the deck  150  through the cooperation of cup-like members  194  with the protrusions  152 . 
     Unless otherwise specified, such words as “fix” and “connect” may have a general meaning. In addition, such words as “upper”, “lower”, “inner”, “outer”, “top” and “bottom” are used to indicate directions or positions as viewed in the drawings, and they are merely used to facilitate the description in the present disclosure, rather than to indicate or imply that a device or member must be arranged or operated at a specific position. 
     Such expressions as “one embodiment”, “embodiments” and “examples” intend to indicate that the features, structures or materials are contained in at least one embodiment or example of the present disclosure, rather than referring to an identical embodiment or example. In addition, the features, structures or materials may be combined in any embodiment or embodiments in an appropriate manner. In the case of no conflict, the embodiments or examples or the features therein may be combined in any form. 
     The above embodiments are for illustrative purposes only, but the present disclosure is not limited thereto. Obviously, a person skilled in the art may make further modifications and improvements without departing from the spirit of the present disclosure, and these modifications and improvements shall also fall within the scope of the present disclosure.