Patent Publication Number: US-11033768-B2

Title: Restoring mechanism and exercising device

Description:
RELATED APPLICATIONS 
     This application claims priority to CN Application Serial Number 201821371905.X, filed Aug. 24, 2018, which is herein incorporated by reference. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a restoring mechanism and an exercising device. More particularly, the present disclosure relates to a restoring mechanism and an exercising device including a restoring force which can be selectively disabled. 
     Description of Related Art 
     Owing to the benefit of exercising, a lot of exercising devices are developed. Some of then can do reciprocated training to train the abdomen, the waist, the hip and/or the arm. In addition, the muscle can be stretched and the health can be improved. 
     A conventional reciprocated exercising device, such as an abdominal exercising device, includes two handles, a wheel and a restoring mechanism. The handles are connected to the wheel, and the restoring mechanism disposed inside the wheel can have a spring structure. When the wheel is rotated in a clockwise direction to compress the restoring mechanism, the restoring mechanism can be restored to assist the user to return to his/her original posture if the wheel is rotated in the counter clockwise direction. Similarly, when the wheel is rotated in the counter clockwise direction to compress the restoring mechanism, the restoring mechanism can be restored to assist the user to return to his/her original posture if the wheel is rotated in the clockwise direction. 
     However, the restoring mechanism in such a conventional reciprocated exercising device cannot be disabled. If the user needs an exercising device without the restoring force, he/she has to buy another exercising device. The usage of the exercising device is limited. 
     Therefore, based on the abovementioned problems, how to effectively improve the structure of the exercising device to allow the exercising device has wide usage becomes a pursuit target for the practitioners. 
     SUMMARY 
     A restoring mechanism for providing a restoring force to an exercising device which includes a fixing structure and a wheel is provided. The restoring mechanism includes a restoring set, a driving set and a connecting set. The restoring set includes a fixed portion and a link-up portion. The fixed portion is connected to the fixing structure. The driving set is connected to the link-up portion. The connecting set is selectively coupled to the driving set. When the connecting set is coupled to the driving set, rotation of the wheel causes the driving set to drive the restoring set such that the restoring set is allowed to accumulate energy. 
     An exercising device is provided. The exercising device includes a fixing structure, one or more wheels and one or more restoring mechanisms disposed at the fixing structure. The one or more restoring mechanisms each includes a restoring set, a driving set, and a connecting set. The restoring set includes a fixed portion and a link-up portion. The fixed portion is connected to the fixing structure. The driving set is connected to the link-up portion. The connecting set is selectively coupled to the driving set. When the connecting set is coupled to the driving set, rotation of the one or more wheels causes the driving set to drive the restoring set such that the restoring set is allowed to accumulate energy. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure can be more fully understood by reading the following detailed description of the embodiments, with reference made to the accompanying drawings as follows: 
         FIG. 1  shows a schematic three-dimensional view of an exercising device according to one embodiment of the present disclosure. 
         FIG. 2  shows an exploded view of the exercising device of  FIG. 1 . 
         FIG. 3  shows one partial exploded view of the exercising device of  FIG. 1 . 
         FIG. 4  shows another partial exploded view of the exercising device of  FIG. 1 . 
         FIG. 5A  shows one partial enlarged cross-sectional view of the exercising device of  FIG. 1 . 
         FIG. 5B  shows another partial enlarged cross-sectional view of the exercising device of  FIG. 1 . 
         FIG. 6  shows one partial exploded view of an exercising device according to another embodiment of the present disclosure. 
         FIG. 7  shows another partial exploded view of the exercising device of the exercising device of  FIG. 6 . 
         FIG. 8A  shows one partial enlarged cross-sectional view of the exercising device of  FIG. 6 . 
         FIG. 8B  shows another partial enlarged cross-sectional view of the exercising device of  FIG. 6 . 
         FIG. 9  shows a partial exploded view of an exercising device according to yet another embodiment of the present disclosure. 
         FIG. 10A  shows one partial enlarged cross-sectional view of the exercising device of  FIG. 9 . 
         FIG. 10B  shows another partial enlarged cross-sectional view of the exercising device of  FIG. 9 . 
         FIG. 11  shows a schematic three-dimensional view of a revolvable member of an exercising device according to still yet another embodiment of the present disclosure. 
         FIG. 12  shows a front view of the revolvable member of  FIG. 11 . 
         FIG. 13A  shows one partial enlarged cross-sectional view of the exercising device of  FIG. 11 . 
         FIG. 13B  shows another partial enlarged cross-sectional view of the exercising device of  FIG. 11 . 
         FIG. 14  shows one operation of an exercising device according to still yet another embodiment of the present disclosure. 
         FIG. 15  shows another operation of an exercising device according to still yet another embodiment of the present disclosure. 
         FIG. 16  shows yet another operation of an exercising device according to still yet another embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     It will be understood that when an element (or mechanism or module) is referred to as be “disposed on”, “connected to” or “coupled to” another element, it can be directly disposed on, connected or coupled to the other element, or it can be indirectly disposed on, connected or coupled to the other element, that is, intervening elements may be present. In contrast, when an element is referred to as be “directly disposed on,” “directly connected to” or “directly coupled to” another element, there are no intervening elements present. 
     In addition, the terms first, second, third, etc. is used herein to describe various elements or components, these elements or components should not be limited by these terms. Consequently, a first element or component discussed below could be termed a second element or component. 
       FIG. 1  shows a schematic three-dimensional view of an exercising device  10  according to one embodiment of the present disclosure.  FIG. 2  shows an exploded view of the exercising device  10  of  FIG. 1 .  FIG. 3  shows one partial exploded view of the exercising device  10  of  FIG. 1 .  FIG. 4  shows another partial exploded view of the exercising device  10  of  FIG. 1 .  FIG. 5A  shows one partial enlarged cross-sectional view of the exercising device  10  of  FIG. 1 .  FIG. 5B  shows another partial enlarged cross-sectional view of the exercising device  10  of  FIG. 1 . The exercising device  10  includes a fixing structure  11 , one or more wheels  12  and one or more restoring mechanisms  13 . 
     The one or more wheels  12  are disposed at the fixing structure  11 , and the one or more restoring mechanisms  13  are disposed at the fixing structure  11  and each includes a restoring set  1200 , a driving set  1300 , and a connecting set  1400 . The restoring set  1200  includes a fixed portion  1211  and a link-up portion  1231 . The fixed portion  1211  is connected to the fixing structure  11 . The driving set  1300  is connected to the link-up portion  1231 . The connecting set  1400  is selectively coupled to the driving set  1300 . When the connecting set  1400  is coupled to the driving set  1300 , rotation of the one or more wheels  12  causes the driving set  1300  to drive the restoring set  1200  such that the restoring set  1200  is allowed to accumulate energy. 
     Therefore, since the restoring set  1200  can selectively accumulate energy to provide a restoring force, the exercising device  10  including the one or more restoring mechanisms  13  can have different operation effects, and the usage thereof can be even changed. 
     The exercising device  10  of  FIG. 1  further includes a carrier  1110 , two frames  1120 , a first axle  1130  and a second axle  1140 . The two frames  1120  are disposed at two sides of the carrier  1100 . The first axle  1130  and the second axle  1140  are spaced apart from each other, and each of the first axle  1130  and the second axle  1140  is connected between the two frames  1120 . A number of the one or more wheels  12  is four, and two of the wheels  12  are disposed at the first axle  1130 . The other two of the wheels  12  are disposed at the second axle  1140 , and the fixed portion  1211  of the restoring set  1200  is connected to one of the frames  1120 . 
     The restoring set  1200  can further include a spiral spring  1210  with the fixed portion  1211 , a spring sleeve  1220  and a belt  1230  with the link-up portion  1231 . The spiral spring  1210  is disposed at the first axle  1130  and further includes a jointed portion  1212 . The spring sleeve  1220  covers the spiral spring  1210  and is connected to the jointed portion  1212 . The belt  1230  is wound around the spring sleeve  1220 . The driving set  1300  can include a spool  1310  and an engaging plate  1320 . The spool  1310  is disposed at the second axle  1140  and is connected to the link-up portion  1231 . The spool  1310  is configured for the belt  1230  to wind therearound. The engaging plate  1320  is connected to one end the spool  1310  and includes an engaging portion  1321 . The connecting set  1400  includes a mounting assembly  1410 . The mounting assembly  1410  is disposed at the second axle  1140  and is connected to the wheels  12  which are disposed at the second axle  1140 . The mounting assembly  1410  includes a mounting portion  1416  selectively coupled to the engaging portion  1321 . The mounting portion  1416  switches between a first position and a second position in an axial direction I 1  of one of the two wheels  12 . When the mounting portion  1416  is located at the first position, the mounting portion  1416  is coupled to the engaging portion  1321 , and rotation of the two wheels  12  that are disposed at the second axle  1140  causes the belt  1230  to wind on the spool  1310  such that the spiral spring  1210  is allowed to accumulate energy. When the mounting portion  1416  is located at the second position, the two wheels  12  that are disposed at the second axle  1140  do not link up with the driving set  1300 . The mounting portion  1416  can include a plurality of protruding teeth, and the engaging portion  1321  can include a plurality of depressions corresponding to the protruding teeth. 
     The second axle  1140  includes an axle body  1411  and a positioning pin  1142 . Two ends  1143 ,  1144  of the axle body  1141  are connected to two of the wheels  12 , respectively. The positioning pin  1142  is protrudingly disposed at the axle body  1141  in a radial direction (not shown) of one of the two wheels  12 , that is, the radial direction perpendicular to the axial direction I 1 . The mounting assembly  1410  further includes a revolvable member  1411  with the mounting portion  1416  and a limiting portion  1412 . The limiting portion  1412  is positioned at the revolvable member  1411  and is coupled to the positioning pin  1142 . The limiting portion  1412  includes a first segment  1414  and a second segment  1415 . When the positioning pin  1142  is located at the second segment  1415 , the mounting portion  1416  is located at the second position and separated from the engaging portion  1321 , and when the positioning pin  1142  is located at the first segment  1414 , the mounting portion  1416  is located at the first position to engage with the engaging portion  1321 . 
     The mounting assembly  1410  can further include a compression spring  1413  located between the revolvable member  1411  and the frame  1120 . When the positioning pin  1142  is located at the second segment  1415 , the revolvable member  1411  causes compression of the compression spring  1413 , and the mounting portion  1416  is located at the second position and separated from the engaging portion  1321 . When the positioning pin  1142  is located at the first segment  1414 , the compression spring  1413  is restored to push the engaging plate  1320 , and the mounting portion  1416  switches to the first position to engage with the engaging portion  1321 . 
     Precisely, the carrier  1110  of the fixing structure  11  is configured for a user to rest, stand or sit thereon. Although carrier  1110  of the fixing structure  11  is rectangular-shaped, the carrier can be, but not limited to, circular-shaped or oval-shaped in other embodiment. 
     Each of the frames  1120  can include two axial holes  1124 . The two holes  1120  can locate at two ends of each frame  1120 , respectively, and the two holes  1120  are configured for the axle bodies  1131 ,  1141  of the first axle  1130  and the second axel  1140  to pass therethrough. The axle bodies  1131 ,  1141  can rotate relative to each frame  1120 . Each frame  1120  can further include a hollow post  1121 , a positioning groove  1122  and a clearance hole  1123 . The hollow post  1121  is disposed at the frame  1120  in the axial direction I 1 . The clearance hole  1123  is positioned at the hollow post  1121  and is communicated with the axial hole  1124 . The clearance hole  1123  is configured for each axle body  1131 ,  1141  to pass therethrough. The positioning groove  1122  is located at the hollow post  1121  and is connected to the fixed portion  1211 . 
     The spring sleeve  1220  is tube-shaped and includes an annular track  1221  and a connecting groove  1222 . The annular track  1221  is located at an outer surface (not labeled) of the spring sleeve  1220  and is configured for the belt  1230  to wind therearound. The connecting groove  1222  is located at an inner wall (not labeled) of spring sleeve  1220  and is configured for connecting the jointed portion  1212  of the spiral spring  1210 . The belt with the link-up portion  1231  can further include an attaching portion  1232 . The attaching portion  1232  is fixed at the spring sleeve  1220 . The belt  1230  is non-elastic. 
     The spiral spring  1210  can cover an outer side of the hollow post  1121 , and the spring sleeve  1220  can cover an outside of the spiral spring  1210 . The fixed portion  1211  is connected to the positioning groove  1122 , and the jointed portion  1212  is connected to the connecting groove  1222 . The belt  1230  is wound around the annular track  1221 . Therefore, when the belt  1230  is pulled to rotate the spring sleeve  1220 , the spiral spring  1210  can deform and accumulate energy owing to the connection between the fixed portion  1211  of the spiral spring  1210  and the positioning groove  1122  of the frame  1120 . Please be noted that, in other embodiment, the spring sleeve can be omitted, and the belt can directly connect to the jointed portion of the spiral spring such that movement of the belt can deform the spiral spring. The present disclosure will not be limited thereto. 
     The spool  1310  can include a shaft  1311 , a clip  1312  and a peg  1313 . The shaft  1311  is disposed the second axle  1140 , and the clip  1312  is disposed at an outside of the shaft  1311 . The peg  1313  is connected to the link-up portion  1231  and is pivotally disposed at the clip  1312 . Hence, when the engaging portion  1321  of the engaging plate  1320  is coupled to the mounting portion  1416 , the spool  1310  can rotate to allow the belt  1230  to wind therearound no matter the wheel  12  is rotated in the clockwise direction or in the counter clockwise direction such that the restoring set  1200  can accumulate energy. 
     The connecting set  1400  is selectively coupled to the driving set  1300 . In the exercising device  10  of  FIG. 1 , the connecting set  1400  is composed of the mounting assembly  1410 . The revolvable member  1411  includes a hole (not labeled) which is communicated with the limiting portion  1412 . The limiting portion  1412  has a L-shaped hole structure, and the limiting portion  1412  includes a first segment  1414  and a second segment  1415  connected to each other to form the L-shaped hole structure. The first segment  1414  is extended in the axial direction I 1 , and the second segment is extended in the radial direction. After the axle body  1141  of the second axel  1140  passes through the hole, the positioning pin  1142  protrudes into the limiting portion  1412  and is limitedly movable in the limiting portion  1412 . Based on the coupling relation between the limiting portion  1412  and the positioning pin  1142 , rotation of the wheel  12  can cause rotation of the second axle  1140  such that the revolvable member  1141  will also rotate. 
     Hence, as shown in  FIG. 5A , when the positioning pin  1142  is located in the second segment  1415 , the mounting portion  1416  is located at the second position and separated from the engaging portion  1321 , and the revolvable member  1411  compresses the compression spring  1413  to allow the compression spring  1413  to accumulate energy. Because the mounting portion  1416  is separated from the engaging portion  1321 , rotation of the wheel  12  cannot cause rotation of the spool  1310 ; as a result, the belt  1230  cannot be wound or released and the restoring set  1200  cannot accumulate energy such that no restoring force can be provided. On the other hand, as shown in  FIG. 5B , when rotation of the revolvable member  1411  causes the positioning pin  1142  to switch from the second segment  1415  to the first segment  1414 , the mounting portion  1416  is switched to the first position and engaged with the engaging portion  1321 . Based on the engagement between the mounting portion  1416  and the engaging portion  1321 , rotation of the wheel  12  can cause rotation of the spool  1310  such that the belt  1230  is allowed to be wound or released, and the restoring set  1200  can accumulate energy to provide the restoring force. 
     In other embodiment, the position of the first segment and the second segment can be changed, and the compression spring can be located between the revolvable wheel and the engaging plate. Under such structure, when the positioning pin is located at the second segment, the mounting portion is located at the first position to couple to the engaging portion and compresses the compression spring. On the other hand, when rotation of the revolvable wheel causes the positioning pin to be located at the first segment, the compression spring is restored to push the revolvable member away from the engaging plate such that the mounting portion is switched to the second position and separated from the engaging portion. The present disclosure is not limited thereto. 
     The exercising device  10  of the  FIG. 1  can further include two handles  14  pivotally disposed at the fixing structure  11 . Precisely, the two handles  14  are pivotally disposed at the two frame  1120 , respectively. Since each handle  14  is pivotally disposed at each frame  1120 , the handle  14  is rotatable relative to the frame  1120 . Additionally, a number of the restoring mechanisms  13  is two. The driving set  1300  of one of the restoring mechanisms  13  is disposed at the first axle  1130 , and the driving set  1300  of the other one of the restoring mechanisms  13  is disposed at the second axle  1140 . In other words, the two restoring mechanisms  13  are arranged oppositely. Such arrangement can increase the restoring force and the loads of all the elements are balanced. In other embodiment, a number of the restoring mechanism can be one. 
       FIG. 6  shows one partial exploded view of an exercising device according to another embodiment of the present disclosure.  FIG. 7  shows another partial exploded view of the exercising device of the exercising device of  FIG. 6 .  FIG. 8A  shows one partial enlarged cross-sectional view of the exercising device of  FIG. 6 .  FIG. 8B  shows another partial enlarged cross-sectional view of the exercising device of  FIG. 6 . 
     The exercising device in  FIG. 6  is similar to the exercising device  10  in  FIG. 1 , but the structure of the connecting set  2400  is different. To be more specific, one of the wheels  22  which are disposed at the second axle  2140  includes a guiding groove  2520 . The second axle  2140  includes an axel body  2141  and a positioning pin  2142 . Two ends of the axle body  2141  are connected to two of the wheels  22 , respectively. The positioning pin  2142  is protrudingly disposed at the axle body  2141  in a radial direction of one of the two wheels  22 . The mounting assembly  2410  can further include a revolvable member  2411  with the mounting portion  2416 , a limiting portion  2412 , and a compression spring  2413 . The limiting portion  2412  is positioned at the revolvable member  2411  and coupled to the positioning pin  2142 . The compression spring  2413  is positioned between the revolvable member  2411  and the engaging plate  2320 . The connecting set  2400  further includes a plug  2420  and a control knob  2440 . The plug  2420  is positioned between the wheel  22  which includes the guiding groove  2520  and the revolvable member  2411  to push against the revolvable member  2411 . The control knob  2440  is disposed at the wheel  22  that includes the guiding groove  2520  and includes a protruding arm  2442  and a slide  2441 . The protruding arm  2442  passes through the wheel  22  that includes the guiding groove  2520  to push the plug  2420 . The slide  2441  is disposed at the protruding arm  2442  and corresponds to the guiding groove  2520 . Rotation of the control knob  2440  in a first direction (not shown) causes the slide  2441  to move along the guiding groove  2520  such that the protruding arm  2442  pushes the plug  2420  to urge the revolvable member  2411  and the mounting portion  2416  is located at the first position to engage with the engaging portion  2321 . Rotation of the control knob  2440  in a second direction can switch the mounting portion  2416  to the second position. 
     The wheel  22  that includes the guiding groove  2520  can further include a wheel body  2510 . The guiding groove  2520  is disposed at a wall surface of the wheel body  2510 . The guiding groove  2520  is arc-shaped and is wound around the inner wall of the wheel body  2510  such that distances between different points of the guiding groove  2520  and the flange of the wheel body  2510  are different. The distance toward one end may increase. Hence, when rotating the control knob  2440 , the slide  2441  will be guided by the guiding groove  2520  to move in the axial direction I 1  such that the plug  2442  will also move in the axial direction I 1 . The plug  2420  is ring-shaped and includes a plurality of abutting arms  2442  and a plurality of limiting arms  2421 . The frame  2120  includes a plurality of through holes  2124  and a plurality of aligning holes  2126 . Each through hole  2124  is configured for each abutting arm  2422  to pass therethrough, and each of the aligning holes  2126  is configured for each limiting arm  2421  to pass therethrough and be limited thereby. The connecting set  2400  can further include a coil spring  2430  positioned between the control knob  2440  and the wheel  22  that includes the guiding groove  2520 . 
     Therefore, as shown in  FIG. 8A , in the initial state, the control knob  2440  is not operated, and the protruding arm  2442  of the control knob  2440  is pushed against the plug  2420 . The abutting arm  2422  of the plug  2420  is pushed against the revolvable member  2411 . Meanwhile, the compression spring  2413  is not compressed and the mounting portion  2416  is separated from the engaging portion  2321 . Because the mounting portion  2416  is separated from the engaging portion  2321 , rotation of the wheel  22  will not rotate the spool  2310  to wind or release the belt  2230 ; consequently, the restoring set  2200  cannot accumulate energy to provide the restoring force. On the other hand, when rotating the control knob  2440  in the first direction, the slide  2441  is guided by the guiding groove  2520  such that the protruding arm  2442  moves along the axial direction I 1  to push the plug  2420 . The abutting arm  2422  will push the revolvable member  2411  to compress the compression spring  2413 . The mounting portion  2416  will be located at the first position and is coupled to the engaging portion  2321 . Based on the engagement between the mounting portion  2416  and the engaging portion  2321 , rotation of the wheel  22  causes the spool  2310  to wind or release the belt  2230  such that the restoring set  2200  can accumulate energy to provide the restoring force. If the user wants to disable the restoring set  2200 , rotation of the control knob  2440  in the second direction can cause the exercising device to return to the state shown in  FIG. 8A . 
       FIG. 9  shows a partial exploded view of an exercising device according to yet another embodiment of the present disclosure.  FIG. 10A  shows one partial enlarged cross-sectional view of the exercising device of  FIG. 9 .  FIG. 10B  shows another partial enlarged cross-sectional view of the exercising device of  FIG. 9 . 
     The exercising device shown in  FIG. 9  is similar to the exercising device shown in  FIG. 1 , but the structure of the connecting set  3400  is different. To be more specific, one of the frames  3120  includes a first tier  3137  and a second tier  3138 . One of the wheels  32  which are disposed at the second axle (not shown) includes a limiting member  3530 . The second axle includes an axel body (not shown) and a positioning pin (not shown). Two ends of the axle body are connected to two of the wheels  32 , respectively. The positioning pin is protrudingly disposed at the axle body in a radial direction perpendicular to the axial direction I 1 . The mounting assembly  3410  can further include a revolvable member  3411  with the mounting portion  3416 , a limiting cave (not labeled), and a compression spring  3413 . The limiting cave is positioned at the revolvable member  3411  and coupled to the positioning pin. The compression spring  3413  is positioned between the revolvable member  3411  and the engaging plate  3320 . The connecting set  3400  further includes a switch barrel  3450 , a plug  3420  and a control knob  3440 . The switch barrel  3450  is positioned between the frame  3120  which includes the first tier  3137  and the second tier  3138  and the revolvable member  3411 , and the switch barrel  3450  includes an abutting portion  3451  and an inclined portion  3452 . The abutting portion  3451  is selectively coupled to the first tier  3137  or the second tier  3138 . The plug  3420  is positioned between the wheel  32  which includes the limiting member  3520  and the frame  3120  that includes the first tier  3137  and the second tier  3138 . The plug  3420  includes one or more abutting arms  3442  which can pass through the frame  3120  that includes the first tier  3137  and the second tier  3138  to push the inclined portion  3452 . The control knob  3440  is disposed at the frame  3120  that includes the first tier  3137  and the second tier  3138  and includes one or more protruding arms  3442 . The one or more protruding arms  3442  pass through the frame  3120  that includes the first tier  3137  and the second tier  3138  to push the plug  3420 , and the one or more protruding arms  3442  are limited by the limiting member  3530 . Pressing the control knob  3440  causes the one or more protruding arms  3442  to push the plug  3420 , and the plug  3420  pushes the inclined portion  3452  to rotate the switch barrel  3450  such that the abutting portion  3451  are engaged with the first tier  3137  and the mounting portion  3416  is located at the first position to couple to the engaging portion  3321 . 
     The wheel  32  that includes the limiting member  3530  can further include a wheel body  3510 . The limiting member  3530  has a through hole structure and is through the wheel body  3510 . When the control knob  3440  is disposed at the wheel  32  that includes the limiting member  3530 , the protruding arm  3442  can pass through the limiting member  3530  and is limitedly movable in the axial direction I 1  within the limiting member  3530 . 
     The plug  3420  is ring-shaped and includes a plurality of abutting arms  3422  extended in the axial direction I 1 . The frame  3120  that includes the first tier  3137  and the second tier  3138  includes a plurality of through hole  3135 , and each through hole  3135  is configured to allow each abutting arm  3442  to pass therethrough. The first tier  3137  is arranged near the second tier  3138 . In the exercising device shown in  FIG. 9 , a plurality of the first tiers  3137  and a plurality second tiers  3138  are surrondingly disposed at an inner wall of an axial hole of the frame  3120 . A maximum distance between the first tier  3137  and the flange of the wheel body  3510  in the axial direction I 1  is smaller than a maximum distance between the second tier  3138  and the flange of the wheel body  3510  in the axial direction I 1 . 
     The switch barrel  3450  is barrel-shaped and includes a narrow segment  3453  and a wide segment  3454 . The plurality of abutting portions  3451  are surroundingly disposed at the narrow segment  3453 , and the plurality of inclined portion  3452  are surroundingly disposed at the wide segment  3454 . Each inclined portion  3452  includes an inclined surface (not shown) corresponding to a tilt surface (not shown) of each abutting arm  3422 . Accordingly, when the abutting arm  3442  pushes the inclined portion  3452 , the tilt surface presses the inclined surface to allow the switch barrel  3450  to move in the axil direction I 1  and rotate simultaneously such that the engagement between the abutting portion  3451  and the first tier  3137  or engagement between the abutting portion  3451  and the second tier  3138  will be changed. 
     As shown in  FIG. 10A , in the initial state, the control knob  3440  is not operated, and the protruding arm  3442  of the control knob  3440  is pushed against the plug  3420 . The abutting arm  3422  of the plug  3420  is pushed against the inclined portion  3452  of the switch barrel  3450 , and the abutting portion  3451  is coupled to the second tier  3183 . Meanwhile, the compression spring  3413  is not compressed, and the mounting portion  3416  is separated from the engaging portion  3321 . Because the mounting portion  3416  is separated from the engaging portion  3321 , rotation of the wheel  32  will not rotate the spool to wind or release the belt; consequently, the restoring set cannot accumulate energy to provide the restoring force. On the other hand, when pressing the control knob  3440  in the axial direction I 1  to allow the protruding arm  3442  to push the plug  3420 , the abutting arm  3442  will axially push the switch barrel  3450  to move and rotate. The abutting portion  3451  will couple to the first tier  3137  and the revolvable member  3441  will compress the compression spring  3413 . The mounting portion  3416  will be located at the first position and couple to the engaging portion  3321 . Based on the engagement between the mounting portion  3416  and the engaging portion  3321 , rotation of the wheel  32  causes the spool to wind or to release the belt such that the restoring set can accumulate energy to provide the restoring force. If the user wants to disable the restoring set, pressing the control knob  3440  in the axial direction I 1  can cause the exercising device to return to the state shown in  FIG. 10A . 
       FIG. 11  shows a schematic three-dimensional view of a revolvable member of an exercising device according to still yet another embodiment of the present disclosure.  FIG. 12  shows a front view of the revolvable member of  FIG. 11 .  FIG. 13A  shows one partial enlarged cross-sectional view of the exercising device of  FIG. 11 .  FIG. 13B  shows another partial enlarged cross-sectional view of the exercising device of  FIG. 11 . 
     The exercising device shown in  FIGS. 11 to 13B  is similar to the exercising device  10  shown in  FIG. 1 , but the structure of the revolvable member  8411  is different. Precisely, the limiting portion  8412  has a T-shaped groove structure. The limiting portion  8412  includes a first segment  8414  and two second segments  8415  connected to the first segment  8414 . The first segment  8414  is extended in the axial direction I 1 , and the two second segments are extended in the radial direction and are located at two side of the first segment  8414 , respectively. 
     Hence, as shown in  FIG. 13A , when the positioning pin  8142  is located in anyone of the second segments  8415 , the mounting portion  8416  is located at the second position and separated from the engaging portion  8321 , and the revolvable member  8411  compresses the compression spring  8413  to allow the compression spring  8413  to accumulate energy. Because the mounting portion  8416  is separated from the engaging portion  8321 , rotation of the wheel  82  cannot cause rotation of the spool; as a result, the belt cannot be wound or released and the restoring set cannot accumulate energy such that no restoring force can be provided. On the other hand, as shown in  FIG. 13B , when rotation of the revolvable member  8411  causes the positioning pin  8142  to switch from the second segment  8415  to the first segment  8414 , the mounting portion  8416  is switched to the first position and engaged with the engaging portion  8321 . Based on the engagement between the mounting portion  8416  and the engaging portion  8321 , rotation of the wheel  82  can cause rotation of the spool such that the belt is allowed to be wound or released, and the restoring set can accumulate energy to provide the restoring force. 
       FIG. 14  shows one operation of an exercising device  70  according to still yet another embodiment of the present disclosure.  FIG. 15  shows another operation of an exercising device  70  according to still yet another embodiment of the present disclosure.  FIG. 16  shows yet another operation of an exercising device  70  according to still yet another embodiment of the present disclosure. The exercising device  70  can be anyone of the exercising devices shown in  FIGS. 1 to 13B . As shown in  FIG. 14 , the user can hold the handles to operate the exercising device  70  which is served as an abdominal exercising device. As shown in  FIG. 15 , the user can rest on the carrier  7110 , and the exercising device  70  can be served as a balance exercising device. Moreover, in  FIG. 14  and  FIG. 15 , the user can operate the connecting set to enable or disable the restoring mechanism. Additionally, the user can stand on the carrier  7110  and the exercising device  70  is served as the skateboard when the restoring mechanism is disabled. 
     Although the present disclosure has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present disclosure without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the present disclosure covers modifications and variations of this disclosure provided they fall within the scope of the following claims.