Patent Publication Number: US-11028623-B2

Title: Bendable display apparatus

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application is a divisional application of co-pending application Ser. No. 15/847,565, filed on Dec. 19, 2017 and entitled “BENDABLE DISPLAY APPARATUS, SUPPORTING DEVICE, AND DUAL-SHAFT HINGE MODULE”, now allowed. Moreover, this divisional application rejoins claims based on Invention I, according to the Restriction Requirement dated Jun. 3, 2019. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present disclosure relates to a display device; in particular, to a bendable display apparatus. 
     2. Description of Related Art 
     When a conventional supporting device is outwardly bent, the total length of the hinge module of the conventional supporting device is not changed, and a plate mounted on an outer surface of the conventional supporting device is deformed because the hinge module stretches the plate. That is to say, when a bendable display mounted on the outer surface of the conventional supporting device is outwardly bent, the bendable display is easily broken because the hinge module of the conventional supporting device stretches the bendable display. 
     SUMMARY OF THE INVENTION 
     The present disclosure provides a bendable display apparatus, a supporting device, and a dual-shaft hinge module to effectively improve the drawbacks associated with conventional supporting devices (or conventional hinge modules). 
     The present disclosure discloses a bendable display apparatus, which includes a carrying plate, a bendable display, and two supporting devices. The carrying plate has an inner surface and an outer surface opposing to the inner surface. The bendable display is mounted on the outer surface of the carrying surface. The two supporting devices are disposed on the inner surface of the carrying plate and define two rotation axes. Each of the two supporting devices includes a dual-shaft hinge module and two buffering modules. The dual-shaft hinge module includes two shafts, a transmitting member, and two side wing members. The two shafts are respectively arranged in the two rotation axes and each have a spiral groove recessed on an outer surface thereof. The transmitting member is clamped between the two shafts. The transmitting member has two driving portions respectively protruding from two opposite sides thereof and is respectively inserted into the two spiral grooves of the two shafts. The two side wing members are respectively and slidably fastened to the two shafts and each have a limiting portion. One of the two shafts is spinable to synchronously rotate the other shaft through the transmitting member so as to respectively move the two side wing members along the two shafts. The two buffering modules are respectively fastened to the two shafts and are arranged at two opposite outer sides of the two shafts. The two buffering modules are respectively cooperated with the two side wing members. Each of the two buffering modules includes an internal connecting member and an external connecting member. The internal connecting member is fixed on and synchronously rotatable with the corresponding shaft. The internal connecting member has a long hole parallel to each of the two rotation axes and sleeved on the limiting portion of the corresponding side wing member. The external connecting member is fixed on the inner surface of the carrying plate and is slidably disposed on the internal connecting member. The external connecting member has a slanting hole non-parallel to each of the two rotation axes and sleeved on the limiting portion of the corresponding side wing member. The slanting hole has a first end arranged adjacent to the corresponding shaft and an opposite second end arranged away from the corresponding shaft. When the carrying plate is bent along at least one of the two axes between an unfolded position and an outwardly folded position, the external connecting member of each of the buffering modules slides with respect to the corresponding internal connecting member, and each of the limiting portions moves in the corresponding slanting hole from the first end to the second end. 
     The present disclosure also discloses a supporting device for being mounted on a carrying plate. The supporting device includes a dual-shaft hinge module and two buffering modules. The dual-shaft hinge module includes two shafts, a transmitting member, and two side wing members. The two shafts are substantially parallel to each other and each have a spiral groove recessed on an outer surface thereof. The transmitting member is clamped between the two shafts. The transmitting member has two driving portions respectively protruding from two opposite sides thereof and respectively inserted into the two spiral grooves of the two shafts. The two side wing members are respectively and slidably fastened to the two shafts and each have a limiting portion. One of the two shafts is spinable to synchronously rotate the other shaft through the transmitting member so as to respectively move the two side wing members along the two shafts. The two buffering modules are respectively fastened to the two shafts and are arranged at two opposite outer sides of the two shafts. The two buffering modules are respectively cooperated with the two side wing members. Each of the two buffering modules includes an internal connecting member and an external connecting member. The internal connecting member is fixed on and synchronously rotatable with the corresponding shaft. The internal connecting member has a long hole parallel to each of the two shafts and sleeved on the limiting portion of the corresponding side wing member. The external connecting member is slidably disposed on the internal connecting member and is configured for being fixed on an inner surface of the carrying plate. The external connecting member has a slanting hole non-parallel to the long hole and sleeved on the limiting portion of the corresponding side wing member. The slanting hole has a first end arranged adjacent to the corresponding shaft and an opposite second end arranged away from the corresponding shaft. 
     The present disclosure further discloses a dual-shaft hinge module, which includes two shafts, a transmitting member, two linking members, and two side wing members. The two shafts are substantially parallel to each other and each have a spiral groove recessed on an outer surface thereof. The transmitting member is clamped between the two shafts. The transmitting member has two driving portions respectively protruding from two opposite sides thereof and respectively inserted into the two spiral grooves. The two linking members are respectively arranged at two opposite sides of the transmitting block. Each of the two linking members is sleeved on the two shafts, and two opposite ends of the transmitting rod are respectively abutted against inner surfaces of the two linking members. The two side wing members are respectively and slidably fastened to the two shafts. Each of the two side wing members includes two end portions slidably sleeved on the corresponding shaft and respectively abutted against outer surfaces of the two linking members, and each of the two side wing members has a limiting portion. When one of the two shafts is spun to synchronously rotate the other shaft through the transmitting member, the transmitting member and the two linking members are synchronously moved to move the two side wing members along the two shafts at the same time. 
     In summary, when the two shafts of each supporting device are spun (i.e., the carrying plate is bent), the hinge module and the connected two buffering modules of each supporting device are cooperated to relatively move each external connecting member and the corresponding internal connecting member in a predetermined distance, thereby preventing the bendable display from suffering damage. 
     In order to further appreciate the characteristics and technical contents of the present disclosure, references are hereunder made to the detailed descriptions and appended drawings in connection with the present disclosure. However, the appended drawings are merely shown for exemplary purposes, and should not be construed as restricting the scope of the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view showing a bendable display apparatus at an unfolded position according to an embodiment of the present disclosure; 
         FIG. 2  is a perspective view showing the bendable display apparatus at an outwardly folded position according to the embodiment of the present disclosure; 
         FIG. 3  is a cross-sectional view taken along a cross-sectional line III-III of  FIG. 2 ; 
         FIG. 4  is a cross-sectional view taken along a cross-sectional line IV-IV of  FIG. 2 ; 
         FIG. 5  is a cross-sectional perspective view of a portion of  FIG. 2 ; 
         FIG. 6  is an exploded view of  FIG. 1 ; 
         FIG. 7  is an exploded view of  FIG. 1  from another perspective; 
         FIG. 8  is an exploded view showing a supporting device according to the embodiment of the present disclosure; 
         FIG. 9  is a cross-sectional view taken along a cross-sectional line IX-IX of  FIG. 8 ; 
         FIG. 10  is a perspective view showing a dual-shaft hinge module of  FIG. 8  in which two positioning members are omitted; 
         FIG. 11  is an exploded view of  FIG. 10 ; 
         FIG. 12  is an exploded view of  FIG. 10  from another perspective; 
         FIG. 13  is a perspective view showing a buffering module of  FIG. 8 ; 
         FIG. 14  is an exploded view of  FIG. 13 ; and 
         FIG. 15  is an exploded view of  FIG. 13  from another perspective. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Reference is made to  FIGS. 1 to 15 , which illustrate an embodiment of the present disclosure. References are hereunder made to the detailed descriptions and appended drawings in connection with the present disclosure. However, the appended drawings are merely provided for exemplary purposes, and should not be construed as restricting the scope of the present disclosure. 
     Reference is first made to  FIGS. 1 to 7 , which illustrate a bendable display apparatus  1000  of the present embodiment. The bendable display apparatus  1000  includes a carrying plate  200 , two supporting devices  100  mounted on an inner surface  201  of the carrying plate  200 , and a bendable display  300  mounted on an outer surface  202  of the carrying plate  200 . The two supporting devices  100  co-define two parallel rotation axes L. The carrying plate  200  in the present embodiment includes a rubber sheet and at least one metallic sheet embedded in the rubber sheet, but the present disclosure is not limited thereto. Moreover, in the present embodiment, a portion (i.e., a center portion) of the bendable display  300  corresponding in position to the two supporting devices  100  can be outwardly bent at 180 degrees (as shown in  FIG. 2 ) without suffering damage, but the present disclosure is not limited thereto. 
     It should be noted that the movement of the bendable display apparatus  1000  is a relative motion, but the figures are of a fixed part of the components for clearly showing the present embodiment. Moreover, each of the two supporting devices  100  in the present embodiment is applied to the bendable display apparatus  1000 , but the supporting device  100  can be applied to other apparatus. 
     The bendable display apparatus  1000  can be bent between an unfolded position (as shown in  FIG. 1 ) and an outwardly folded position (as shown in  FIG. 2 ). The following description discloses the structure of each of the components of the bendable display apparatus  1000 , and then discloses the related features of the components of the bendable display apparatus  1000 . The two supporting devices  100  in the present embodiment are substantially an identical or a symmetrical structure, so the following description only illustrates one of the two supporting devices  100 . 
     As shown in  FIGS. 8 and 9 , the supporting device  100  includes a dual-shaft hinge module  1  and two buffering modules  2  respectively arranged at two opposite sides of the dual-shaft hinge module  1 . The dual-shaft hinge module  1  in the present embodiment is applied to the supporting device  100 , but the dual-shaft hinge module  1  can be applied to other devices. 
     The dual-shaft hinge module  1  includes two shafts  11 , a plurality of torsion washers  12 , a transmitting member  13 , two linking members  14 , two side wing members  15 , and two positioning members  16 . The two shafts  11  are respectively arranged in the two rotation axes L. Each of the torsion washers  12  is sleeved on the two shafts  11 . A portion of the transmitting member  13  is sandwiched between the two shafts  11 . Each of the two linking members  14  is sleeved on the two shafts  11 , and the two linking members  14  are arranged at two opposite sides of the transmitting member  13 . The two side wing members  15  are respectively and slidably disposed on the two shafts  11 . The following description discloses the structure and connection of each component of the dual-shaft hinge module  1 . 
     As shown in  FIGS. 10 to 12 , the two shafts  11  are substantially parallel to each other, that is to say, central lines of the two shafts  11  are respectively overlapped on the two rotation axes L. The two shafts  11  in the present embodiment are in a mirror symmetrical arrangement, so the following description only discloses the structure of one of the two shafts  11  for the sake of brevity. 
     The shaft  11  includes a driving segment  111 , two extending segments  112  respectively arranged at two opposite outer sides of the driving segment  111  (i.e., the left side and the right side of the driving segment  111  as shown in  FIG. 11 ), and two wedging segments  113  respectively arranged at two opposite outer sides of the two extending segments  112  (i.e., the left side and the right side of the two extending segments  112  as shown in  FIG. 11 ). A cross section of the driving segment  111  perpendicular to the central line of the shaft  11  has a substantial circular shape, and a maximum diameter of the driving segment  111  is equal to that of the shaft  11 . A cross section of each of the two extending segments  112  perpendicular to the central line of the shaft  11  has a non-circular shape. A cross section of each of the two wedging segments  113  perpendicular to the central line of the shaft  11  can be a circular shape or a non-circular shape according to a designer&#39;s demand. 
     Specifically, the shaft  11  has two spiral grooves  1111  recessed on an outer surface of the driving segment  111 , and each of the spiral grooves  1111  has a spiral angle within a range of 40-60 degrees. The spiral angle in the present embodiment is 45 degrees, but the present disclosure is not limited thereto. A depth of each of the spiral grooves  1111  is ⅕- 1/7 of the maximum diameter of the driving segment  111 , and the depth of each of the spiral grooves  1111  in the present embodiment is substantially ⅙ of the maximum diameter of the driving segment  111 . Moreover, a projecting region, which is defined by orthogonally projecting each of the spiral grooves  1111  in a longitudinal direction of the shaft  11  (i.e., the rotation axis L) onto a plane, is an arc shape having a central angle equal to or smaller than 90 degrees, and the central angle in the present embodiment is 90 degrees, but the present disclosure is not limited thereto. 
     Each of the extending segments  112  in the present embodiment is substantially a round column, and the outer diameter is smaller than the maximum diameter of the driving segment  111 . Moreover, each of the wedging segments  113  is a column having the non-circular cross section, so that the two wedging segments  113  can be respectively fixed to the two buffering modules  2 . 
     For the two shafts  11 , the two extending segments  112  of each of the two shafts  11  respectively couple through the torsion washers  12 . That is to say, the torsion washers  12  of the dual-shaft hinge module  1  are respectively arranged at two opposite sides of the two driving segments  111  (i.e., the left side and the right side of the two driving segments  111  as shown in  FIG. 10 ). Thus, the two shafts  11  are spinable with respect to each of the torsion washers  12  to provide torsion for the dual-shaft hinge module  1  by a friction generated between the extending segments  112  of the two shafts  11  and each of the torsion washers  12 . Moreover, the arrangement of the torsion washers  12  can be provided to effectively maintain the relative position between the two shafts  11 . 
     Moreover, in the two shafts  11  as shown in  FIG. 8 , any two adjacent wedging segments  113  are inserted into one of the positioning members  16 . That is to say, the two wedging segments  113  of each of the two shafts  11  are respectively inserted into and fixed in the two positioning members  16 . A center portion of each of the two positioning members  16  is fixed on the inner surface  201  of the carrying plate  200  (as shown in  FIG. 6 ). 
     As shown in  FIGS. 10 to 12 , the transmitting member  13  includes a transmitting block  131  and a transmitting rod  132  connected to (i.e., coupling through and fastened to) the transmitting block  131 . The transmitting block  131  and the transmitting rod  132  can be integrally connected to each other or detachably connected to each other, but the present disclosure is not limited thereto. 
     The transmitting block  131  has two concave surfaces  1311  respectively recessed on two opposite sides thereof (i.e., the front side and the rear side of the transmitting block  131  as shown in  FIG. 11 ) and four driving portions  1312  respectively protruding from the two concave surfaces  1311 . The four driving portions  1312  of the transmitting block  131  in the present embodiment are in a mirror symmetrical arrangement, but the present disclosure is not limited thereto. 
     Specifically, the transmitting block  131  is sandwiched between the two shafts  11 , and the two concave surfaces  1311  of the transmitting block  131  respectively face the driving segments  111  of the two shafts  11 . Each of the two concave surfaces  1311  is arranged to accommodate a portion of the corresponding shaft  11 . The two driving portions  1312 , which are corresponding in position to the same concave surface  1311 , are respectively inserted into the two spiral grooves  1111  of the corresponding shaft  11 . 
     Moreover, in order to firmly connect the two shafts  11  and the transmitting block  131 , the connection between the two shafts  11  and the transmitting block  131  in the present embodiment can be provided with the following features. 
     Specifically, in a cross section of the dual-shaft hinge module  1  perpendicular to each of the two axes L (i.e., a cross section of the two shafts  11  and the blocking segment  131  as shown in  FIG. 9 ), each of the driving segments  111  is substantially a circular shape, and each of the two concave surfaces  1311  is substantially an arc shape having a center of circle overlapped at a center of the portion of the driving segment  111  of the corresponding shaft  11 . Moreover, in the cross section of the dual-shaft hinge module  1 , a radius of each of the two concave surfaces  1311  is substantially equal to (i.e., slightly larger than) that of each driving segment  111 , and each of the two concave surfaces  1311  has a central angle within a range of 80-110 degrees (i.e., 90 degrees), but the present disclosure is not limited thereto. 
     In addition, the number of the spiral grooves  1111  of each of the two shafts  11  in the present embodiment is two, and each of the concave surfaces  1311  is formed with two driving portions  1312 , but the present disclosure is not limited thereto. For example, in other embodiments of the present disclosure, each of the two shafts  11  can be formed with a single spiral groove  1111 , and the transmitting block  131  has two driving portions  1312  respectively arranged in the two concave surfaces  1311  for respectively inserting into the spiral grooves  1111  of the two shafts  11 . 
     As shown in  FIGS. 10 to 12 , the longitudinal direction of the transmitting rod  132  is substantially parallel to each of the two rotation axes L. The transmitting rod  132  in the present embodiment includes a fixing segment  1321  and two connecting segments  1322  respectively extending from two opposite ends of the fixing segment  1321 . The fixing segment  1321  is wedged in the transmitting block  131 . The two connecting segments  1322  respectively pass through the torsion washers  12 , and each of the two connecting segments  1322  and the corresponding torsion washers  12  are preferably in a frictionless connection or a low friction connection, so that the two connecting segments  1322  can slide with respect to the torsion washers  12  more smooth. 
     As shown in  FIGS. 10 to 12 , the two linking members  14  in the present embodiment are respectively arranged at two opposite sides of the transmitting block  131 , and each of the linking members  14  is sleeved on the two shafts  11 . Two opposite ends of the transmitting rod  132  (as shown in  FIG. 11 ) are respectively abutted against inner surfaces of the two linking members  14 . Each of the two shafts  11  and the corresponding linking members  14  are preferably in a frictionless connection or a low friction connection, so that each of the linking members  14  can slide with respect to the two shafts  11  more smooth. It should be noted that each of the linking members  14  in the present embodiment includes a plurality of stacked washers, but the present disclosure is not limited thereto. For example, in other embodiments of the present disclosure, the linking member  14  can be a single structure. 
     As shown in  FIGS. 10 to 12 , the two side wing members  15  are respectively and slidably fastened to the two shafts  11 . In the present embodiment, each of the two side wing members  15  includes a long rod  151 , a wing  152  perpendicularly connected to the long rod  151 , a limiting portion  153  formed on an end of the wing  152 , and two end portions  154  respectively installed on two opposite ends of the long rod  151 . 
     The long rod  151  of each of the two side wing members  15  is parallel to each of the two rotation axes L, and the long rod  151  and the wing  152  of each of the two side wing members  15  in the present embodiment are integrally formed as a T-shaped structure. Each of the positioning portions  153  is integrally formed on the corresponding wing  152  and faces the inner surface  201  of the carrying plate  200 . The two end portions  154  of each of the side wing members  15  are slidably sleeved on the corresponding shaft  11  and are respectively abutted against outer surfaces of the two linking members  14 . Each of the two shafts  11  and the corresponding end portions  154  are preferably in a frictionless connection or a low friction connection, so that each of the end portions  154  can slide with respect to the corresponding shaft  11  more smooth. 
     Accordingly, the transmitting member  13  and the two linking members  14  are synchronously movable to move the two side wing members  15  along the two shafts  11  at the same time. In addition, the transmitting member  13 , the two linking members  14 , and the two side wing members  15  are rotatable along at least one of the two rotation axes L with respect to the two shafts  11  and the torsion washers  12 . 
     In addition, the two linking members  14  and the transmitting member  13  in the present embodiment are different components, but the present disclosure is not limited thereto. For example, in other embodiments of the present disclosure, the two linking members  14  can be regarded as a part of the transmitting member  13  and are respectively connected to the two connecting segments  1322 , or the two linking members  14  can be regarded as part of the two side wing members  15  and are respectively connected to the end portions  154  of the two side wing members  15 . Thus, one of the two shafts  11  is spinable to synchronously rotate the other shaft  11  through the transmitting member  13  so as to respectively move the two side wing members  15  along the two shafts  11 . 
     As shown in  FIGS. 8 and 13-15 , the two buffering modules  2  are respectively fastened to and arranged at two opposite outer sides of the two shafts  11 . The two buffering modules  2  are respectively cooperated with the two side wing members  15 . Each portion of each of the two buffering module  2  fastened to the corresponding shaft  11  is arranged between the positioning member  16  and the adjacent end portion  154  of the side wing member  15 , and is an end of the moving path of the two side wing members  15 . Moreover, as the buffering modules  2  are of the same or symmetrical structure, the following description only discloses the structure of one of the buffering modules  2  for the sake of brevity. 
     The buffering module  2  includes an internal connecting member  21 , an external connecting member  22 , and two limiting mechanisms  23 . The internal connecting member  21  is fixed on and synchronously rotatable with the corresponding shaft  11 . The external connecting member  22  is fixed on the inner surface  201  of the carrying plate  200  and is slidably disposed on the internal connecting member  21 . The two limiting mechanisms  23  are installed on the internal connecting member  21  for positioning the external connecting member  21 . 
     The internal connecting member  21  in the present embodiment includes a sheet  211  and two pivoting blocks  212  fixed on the sheet  211 . The two pivoting blocks  212  are respectively sleeved on and fixed in the two wedging segments  113  of the corresponding shaft  11 , and each of the two pivoting blocks  212  is arranged between the adjacent positioning member  16  and the adjacent end portion  154  of the corresponding side wing member  15 . The sheet  211  has a long hole  2111  parallel to each of the two rotation axes L and sleeved on the limiting portion  153  of the corresponding side wing member  15 . A length of the long hole  2111  is larger than the moving path of the corresponding side wing member  15  in the rotation axis L. 
     Moreover, the external connecting member  22  in the present embodiment includes a bottom plate  221  and two track seats  222  disposed on the bottom plate  221 . The bottom plate  221  and the track seats  222  are fixed on the inner surface  201  of the carrying plate  200 . The bottom plate  221  has a slanting hole  2211  non-parallel to the long hole  2111  and sleeved on the limiting portion  153  of the corresponding side wing member  15 . In other words, a projecting region, which is defined by orthogonally projecting the slanting hole  2211  and the long hole  2111  onto a plane, has an acute angle there-between. The slanting hole  2211  has a first end  2212  arranged adjacent to the corresponding shaft  11  and an opposite second end  2213  arranged away from the corresponding shaft  11 . Specifically, the limiting portion  153  of the corresponding side wing member  15  is sequentially inserted into the long hole  2111  and the slanting hole  2211 . The sheet  211  of the internal connecting member  21  is slidably disposed on the two track seats  222  of the external connecting member  22 , and each of the track seats  222  has two limiting slots  2221  spaced each other. 
     Each of the limiting mechanisms  23  in the present embodiment includes a base  231 , a limiting member  232  disposed on the base  231 , and a plurality of springs  233  connected to the base  231  and the limiting member  232  (as shown in  FIG. 15 ). The bases  231  of the two limiting mechanisms  23  are fixed on the sheet  211  of the internal connecting member  21 . The springs  233  of the two limiting mechanisms  23  are configured to respectively move the two limiting members  232  toward the two track seats  222 , thereby maintaining the contact between each of the two limiting members  232  and the corresponding track seat  222 . Moreover, each of the two limiting members  232  is selectively engaged in one of the two limiting slots  2221  of the corresponding track seat  222 . 
     Specifically, when the carrying plate  200  is bent along at least one of the two axes L between the unfolded position (as shown in  FIGS. 1 and 8 ) and the outwardly folded position (as shown in  FIGS. 3 to 5 ), the external connecting member  22  of each of the buffering modules  2  slides with respect to the corresponding internal connecting member  21 , each of the limiting portions  153  moves in the corresponding slanting hole  2211  from the first end  2212  to the second end  2213 , and the limiting member  232  of each limiting mechanism  23  is moved from one of the two limiting slots  2221  to the other limiting slot  2221  of each track seat  222  of the corresponding external connecting member  22 . 
     It should be noted that when the carrying plate  200  is bent, the width of the carrying plate  200  perpendicular to each of the rotation axes L and the width of each dual-shaft hinge module  2  defined by a maximum length between the two side wing members  15  are not changed, so that the two external connecting members  22  of each supporting device  100  mounted on the carrying plate  200  have a fixed length, and the two internal connecting members  21  of each dual-shaft hinge module  2  have a fixed length. Thus, when the carrying plate  200  is bent from the unfolded position toward the outwardly folded position, the two internal connecting members  21  of each supporting device  100  are outwardly moved with respect to the two corresponding external connecting members  22 . 
     Accordingly, when the carrying plate  100  is bent to the outwardly folded position, the cooperation of each slanting hole  2211  and the corresponding limiting portion  153  and the cooperation of each limiting mechanism  23  and the two limiting slots  2221  of the corresponding external connecting member  22  are provided to effectively prevent the carrying plate  200  from being bent in a direction away from the unfolded position. In other words, the carrying plate  200  or the bendable display  300  can be avoided to be bent inwardly. 
     In addition, the two bottom plates  221  of one of the two supporting devices  100  in the present embodiment are respectively and integrally formed with the two bottom plates  221  of the other supporting device  100 , but the present disclosure is not limited thereto. For example, in other embodiments of the present disclosure, the two bottom plates  221  of one of the two supporting devices  100  can be respectively separated from the two bottom plates  221  of the other supporting device  100 . 
     The descriptions illustrated supra set forth simply the preferred embodiments of the present disclosure; however, the characteristics of the present disclosure are by no means restricted thereto. All changes, alterations, or modifications conveniently considered by those skilled in the art are deemed to be encompassed within the scope of the present disclosure delineated by the following claims.