Patent Publication Number: US-9419397-B2

Title: 360 degree rotatable plug

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention generally relates to a plug, and more particularly to a rotatable plug. 
     2. The Related Art 
     Nowadays, electronic equipments are widely used in people&#39;s daily production and lives. In order to provide power for the electronic equipment, a plug connected with one end of a connecting cable is needed, wherein the other end of the connecting cable is electrically connected with the electronic equipment. In use, the plug is inserted into a socket for realizing a connection between the electronic equipment and a power supply. After the plug is inserted into the socket, because the socket is immovable, the plug is fastened to the socket. In order to achieve a use convenience, the electronic equipment is often moved, so the connecting cable of the plug often needs to be twisted. 
     However, because the connecting cable of the plug often needs to be twisted, and the plug hardly rotates along the traction direction of the connecting cable, the connecting cable is easily damaged and even broken down to cause a phenomenon of leaking electricity, short circuit or open circuit of the connecting cable. As a result, an electrical performance stability and a use convenience of the plug are affected. 
     So in order to satisfy the need of the people&#39;s daily production and lives, it&#39;s essential to provide a rotatable plug which is facilitate for the electrical performance stability and the use convenience. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a rotatable plug. The rotatable plug includes an upper cover, a dynamic rotatable unit, a static rotatable unit, a connecting cable and a lower cover. The upper cover includes a top board. A front end of the top board defines an opening vertically penetrating through the front end of the top board. The dynamic rotatable unit includes a terminal board, a plurality of conductive pins and a plurality of dynamic conductive tubes. The conductive pins are fastened to the terminal board, and top ends of the conductive pins project beyond a top of the terminal board. The dynamic conductive tubes are fastened to a bottom of the terminal board and are spaced from one another. Each of the dynamic conductive tubes has a rotatable ring. A bottom end of each of the conductive pins projects under the bottom of the terminal board and is fastened to a bottom of one end of one of the dynamic conductive tubes. The static rotatable unit is pivotally mounted to a bottom of the dynamic rotatable unit. The static rotatable unit includes a base and a plurality of static conductive tubes. The static conductive tubes are fastened to the base and are spaced from one another. Each of the static conductive tubes has a ring body. The rotatable ring of each of the dynamic conductive tubes is disposed around and is electrically connected with the ring body of one of the static conductive tubes. The connecting cable is fastened to the static rotatable unit. The upper cover is covered on the dynamic rotatable unit, the static rotatable unit and the connecting cable. The top ends of the conductive pins are exposed out of the upper cover through the opening. The lower cover is fastened under the upper cover to make the dynamic rotatable unit, the static rotatable unit and a front end of the connecting cable fastened between the upper cover and the lower cover. A rear end of the connecting cable projects out of the upper cover and the lower cover. The upper cover, the static rotatable unit and the lower cover are capable of rotating 360 degrees along a fraction direction of the connecting cable, and the upper cover, the static rotatable unit, the lower cover and the connecting cable are capable of proceeding the same angle rotation. 
     As described above, the upper cover, the static rotatable unit, the lower cover and the clamping assembly are capable of rotating 360 degrees along the traction direction of the connecting cable, and the upper cover, the static rotatable unit, the lower cover, the clamping assembly and the connecting cable are capable of proceeding the same angle rotation. So that it&#39;s easier to keep the connecting cable connected with the static rotatable unit in good shape for ensuring an electrical performance stability and a usage convenience of the rotatable plug. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention will be apparent to those skilled in the art by reading the following description, with reference to the attached drawings, in which: 
         FIG. 1  is a perspective view of a rotatable plug in accordance with an embodiment of the present invention; 
         FIG. 2  is an exploded view of the rotatable plug of  FIG. 1 ; 
         FIG. 3  is another exploded view of the rotatable plug of  FIG. 1 ; 
         FIG. 4  is an exploded view of a dynamic rotatable unit of the rotatable plug of 
         FIG. 3 ; 
         FIG. 5  is an exploded view of a static rotatable unit of the rotatable plug of  FIG. 3 ; 
         FIG. 6  is an exploded view of a clamping assembly of the rotatable plug of  FIG. 3 ; 
         FIG. 7  is a partially perspective view of the rotatable plug of  FIG. 1 ; 
         FIG. 8  is a perspective view of a terminal board of the rotatable plug of  FIG. 1 ; 
         FIG. 9  is a perspective view of a base of the rotatable plug of  FIG. 1 ; and 
         FIG. 10  is a perspective view showing rotating statuses of the rotatable plug of  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIG. 1  and  FIG. 2 , a rotatable plug  100  in accordance with an embodiment of the present invention is shown. The rotatable plug  100  includes an upper cover  10 , a dynamic rotatable unit  20 , a static rotatable unit  30 , a connecting cable  50 , a lower cover  40  and a clamping assembly  60 . 
     Referring to  FIG. 1 ,  FIG. 2  and  FIG. 3 , the upper cover  10  includes a top board  11  and a first blocking wall  12  protruded downward from a periphery of the top board  11 . A front end of the top board  11  defines an opening  111  vertically penetrating through the front end of the top board  11 . An inner periphery of a bottom of the first blocking wall  12  is recessed inward to form a blocking groove  121 . Several portions of a bottom surface of the top board  11  protrude downward to form a plurality of hollow-shaped first fastening pillars  122  and second fastening pillars  123  arranged at intervals. A bottom of a rear end of the first blocking wall  12  is recessed inward to form a first recess  124 . A junction between a top sidewall of the first recess  124  and the bottom surface of the top board  11  protrudes downward to form a cross-shaped restricting block  125 . 
     Referring to  FIG. 2 ,  FIG. 3  and  FIG. 4 , the dynamic rotatable unit  20  includes a terminal board  21 , a plurality of conductive pins  22 , a plurality of dynamic conductive tubes  23 , an isolating ring  24  and a first fastening element  28 . The conductive pins  22  include a ground wire pin  221 , a neutral wire pin  222  and a live wire pin  223 . The dynamic conductive tubes  23  include a dynamic conductive tube of ground wire  25 , a dynamic conductive tube of neutral wire  26  and a dynamic conductive tube of live wire  27 . 
     Referring to  FIG. 2 ,  FIG. 3 ,  FIG. 4  and  FIG. 8 , the terminal board  21  has a circular first main board  210 , and a ring-shaped blocking portion  211  protruded downward from a periphery of the first main board  210 . A front end of a bottom surface of the first main board  210  protrudes downward to form a protruding pillar  201 . Two opposite sides of a rear end of the bottom surface of the first main board  210  protrude downward to form two rectangular protruding blocks  202 . The terminal board  21  defines a circular first insertion hole  212  vertically penetrating through the protruding pillar  201  and the first main board  210 , and two rectangular second insertion holes  213  respectively penetrating through the protruding blocks  202  and the first main board  210  vertically. A middle of the bottom surface of the first main board  210  protrudes downward to form a hollow-shaped first supporting column  214 , and a semicircular-shaped first supporting portion  215  disposed around and spaced from the first supporting column  214 . The first supporting portion  215  is spaced from the protruding pillar  201  and the two protruding blocks  202 . A front end of the first supporting portion  215  is cut off to form a gap  203 . 
     Referring to  FIG. 2 ,  FIG. 3 ,  FIG. 4  and  FIG. 8 , two opposite sides and a rear end of the first supporting column  214  protrude outward to form a plurality of guiding pillars  204  extending vertically. An upper portion of one of the guiding pillars  204  located at the rear end of the first supporting column  214  protrudes outward to form a first bearing portion  216 . Two free ends of an outside of the first supporting portion  215  protrude outward to form two first abutting portions  217 . Two portions of the outside of the first supporting portion  215  protrude outward to form two second bearing portions  218 . One of the second bearing portions  218  is connected with one of the first abutting portions  217 , and the other second bearing portion  218  is located adjacent to and spaced from the other first abutting portion  217 . One side of the bottom surface of the first main board  210  protrudes downward to form a hollow-shaped locating pillar  219 . 
     Referring to  FIG. 2  and  FIG. 4 , the ground wire pin  221  has a first fastening portion  205 , a cylindrical first insertion portion  206  protruded upward and then extended outward from a top end of the first fastening portion  205 , and a first contact portion  207  protruded downward from a middle of a bottom end of the first fastening portion  205 . The neutral wire pin  222  and the live wire pin  223  have the same structure. The neutral wire pin  222  and the live wire pin  223  respectively have an elongated second fastening portion  224 , a second insertion portion  225  extended upward from a top end of the second fastening portion  224 , and two second contact portions  226  protruded downward from two opposite sides of a bottom end of the second fastening portion  224 . 
     Referring to  FIG. 2  and  FIG. 4 , each of the dynamic conductive tubes  23  has a rotatable ring  29 . The dynamic conductive tube of ground wire  25  has a first rotatable ring  251 , and a first connecting piece  252  extended outward from a top periphery of the first rotatable ring  251 . The first connecting piece  252  opens a first connecting hole  253 . A rear end of the top periphery of the first rotatable ring  251  is recessed downward to form a first lacking groove  254 . 
     Referring to  FIG. 2  and  FIG. 4 , the dynamic conductive tube of neutral wire  26  has a second rotatable ring  261 , and a second connecting piece  262  extended outward from one side of a rear end of a top periphery of the second rotatable ring  261 . The second connecting piece  262  opens a second connecting hole  263 . A front end of a top periphery of the second rotatable ring  261  is recessed downward to form a second lacking groove  264 . 
     Referring to  FIG. 2  and  FIG. 4 , the dynamic conductive tube of live wire  27  has a third rotatable ring  271 , a third connecting piece  272  extended outward from one side of a rear end of a top periphery of the third rotatable ring  271 , and a fourth connecting piece  273  extended outward from the other side of the rear end of the top periphery of the third rotatable ring  271 . The third connecting piece  272  opens a third connecting hole  274 . The fourth connecting piece  273  opens a fourth connecting hole  275 . 
     Referring to  FIG. 2  and  FIG. 4 , the isolating ring  24  has a ring-shaped main body  241 , and a semicircular locating piece  242  protruded outward from a top edge of the main body  241 . Two opposite sides of the locating piece  242  protrude downward to form two holding portions  243 . A top surface of each of the holding portions  243  is concaved downward to form a holding groove  244 . A locating groove  245  is formed between two free ends of the locating piece  242 . The locating piece  242  opens a locating hole  246 . 
     Referring to  FIG. 2 ,  FIG. 3  and  FIG. 5 , the static rotatable unit  30  includes a base  31 , a plurality of static conductive tubes  32 , a plurality of hollow-shaped wire clamps  33 , a sealing element  34  and a plurality of locking elements  35 . The static conductive tubes  32  include a static conductive tube of ground wire  36 , a static conductive tube of neutral wire  37  and a static conductive tube of live wire  38 . 
     Referring to  FIG. 2 ,  FIG. 3 ,  FIG. 5  and  FIG. 9 , the base  31  has a semicircular second main board  310 , a semicircular surrounding wall  311  protruded upward from a periphery of the second main board  310 , two rear walls  312  protruded upward from two opposite sides of a rear end of the second main board  310 , and an arc-shaped connecting wall  313  connecting between the two rear walls  312  and projecting beyond top surfaces of the two rear walls  312  and a rear end of the surrounding wall  311 . The second main board  310 , the surrounding wall  311 , the two rear walls  312  and the connecting wall  313  surround an accommodating space  314  thereamong. A middle of the second main board  310  opens a fastening hole  301 . 
     A periphery of a sidewall of the fastening hole  301  protrudes upward to form a cylindrical second supporting ring  315 . A middle of the second supporting ring  315  is corresponding to the fastening hole  301 . A top of an inner periphery of the second supporting ring  315  protrudes inward to form a ring-shaped third abutting portion  316 . Two opposite sides of the inner periphery of the second supporting ring  315  are recessed oppositely to form two buckling grooves  302  vertically penetrating through two opposite sides of the third abutting portion  316 . One side of a bottom end of an outer periphery of the second supporting ring  315  opens a fastening groove  303 . A front end and a rear end of the second main board  310  protrude upward to form two second supporting portions  317  respectively located in front of and behind the second supporting ring  315 . 
     Referring to  FIG. 2 ,  FIG. 3 ,  FIG. 5  and  FIG. 9 , two opposite sides of the second main board  310  are concaved downward and extend towards the second supporting ring  315  to form two assembling grooves  304 . Two junctions respectively between the two rear walls  312  and two opposite sides of the connecting wall  313  extend forward and downward to form two isolating boards  318  connecting with two bottom sidewalls of the two assembling grooves  304 . Two inner surfaces of two free ends of the surrounding wall  311  are recessed oppositely to form two restraining grooves  305 . Two tops of two side surfaces of the two isolating boards  318  respectively facing to the two restraining grooves  305  are recessed inward to form two guiding grooves  306 . Two bottoms of the two side surfaces of the two isolating boards  318  facing to the two restraining grooves  305  are recessed inward to form two guiding channels  307 . The two guiding grooves  306  are respectively in alignment with the two guiding channels  307 . 
     A junction between the second main board  310  and the connecting wall  313  is connected with a fastening block  319 . A rear end of the base  31  defines a plurality of receiving grooves  308 . One of the receiving grooves  308  penetrates through a bottom and a front of the fastening block  319 . The other two receiving grooves  308  respectively penetrate through two opposite sides of the second main board  310  and two middles of the two rear walls  312 , and communicated with the two assembling grooves  304 . Two opposite sides of a top of an inner periphery of the surrounding wall  311  protrude inward to form two limiting blocks  309 . Two opposite sides of the surrounding wall  311  and a rear end of the fastening block  319  protrude outward to form a plurality of fastening rings  3111 . A front end of the surrounding wall  311  projects beyond a top surface of a rear end of the surrounding wall  311 . The top surface of the connecting wall  313  is flush with a top surface of the front end of the surrounding wall  311 . 
     Referring to  FIG. 2 ,  FIG. 4  and  FIG. 5 , each of the static conductive tubes  32  has a ring body  39 . The rotatable ring  29  of each of the dynamic conductive tubes  23  is disposed around and is electrically connected with the ring body  39  of one of the static conductive tubes  32 . The static conductive tube of ground wire  36  has a first ring body  361 , a U-shaped first connecting arm  362  connecting with a rear end of a bottom periphery of the first ring body  361 , and a first contact arm  363  extended rearward from a free end of the first connecting arm  362 . Two opposite sides of a front end of the first contact arm  363  extend downward to form two first fastening arms  364 . A rear end of the first contact arm  363  is bent downward to form a first blocking arm  365 . Two portions of a top surface of the first contact arm  363  protrude upward to form two first touching points  366 . Two opposite sides of the first ring body  361  are punched outward to form two buckling portions  367 . 
     Referring to  FIG. 2  and  FIG. 5 , the static conductive tube of neutral wire  37  has a second ring body  371 , a second connecting arm  372  extended downward, then extended outward, and further bent rearward and extended upward from one side of a bottom periphery of the second ring body  371 , and a second contact arm  373  extended rearward from a free end of the second connecting arm  372 . One end of the second connecting arm  372  adjacent to the second ring body  371  is punched inward to form a second fastening arm  374 . A free end of the second contact arm  373  protrudes downward to form a second blocking arm  375 . Two portions of a top surface of the second contact arm  373  protrude upward to form two second touching points  376 . 
     Referring to  FIG. 2  and  FIG. 5 , the static conductive tube of live wire  38  has a third ring body  381 , a third connecting arm  382  extended downward and outward, then bent rearward, and further extended upward from one side of a bottom periphery of the third ring body  381 , and a third contact arm  383  extended rearward from a free end of the third connecting arm  382 . A free end of the third contact arm  383  protrudes downward to form a third blocking arm  384 . Two portions of a top surface of the third contact arm  383  protrude upward to form two third touching points  385 . The other side of the bottom periphery of the third ring body  381  is bent outward to form a fixing arm  386 . 
     Referring to  FIG. 2  and  FIG. 5 , each of the wire clamps  33  shows a hollow shape with a front and a rear being opened freely. A bottom of each of the wire clamps  33  opens a locking hole  331 . The sealing element  34  has a U-shaped sealing portion  340  with the mouth thereof facing rearward. Two opposite sides of each free end of the sealing portion  340  protrude downward to form two restraining portions  341 . Two facing surfaces of the two restraining portions  341  of the two free ends of the sealing portion  340  protrude face to face to form two guiding portions  342 . A bottom of each free end of the sealing portion  340  extends downward to form a limiting portion  343  located behind the two restraining portions  341 . A bottom of the limiting portion  343  defines a fixing groove  344  corresponding to the fixing arm  386 . 
     Referring to  FIG. 2 , the lower cover  40  is matched with the upper cover  10  in shape. The lower cover  40  has a bottom board  41  and a second blocking wall  42  protruded upward from a periphery of the bottom board  41 . Several portions of the bottom board  41  protrude upward to form a plurality of spaced hollow-shaped third fastening pillars  43  connecting with an inner periphery of the second blocking wall  42 . Another several portions of the bottom board  41  protrude upward to form a plurality of spaced propping portions  44 . A top of a rear end of the bottom board  41  is concaved downward to form a second recess  45  corresponding to the first recess  124 . An inner periphery of a top of the second blocking wall  42  protrudes upward to form a blocking rib  46 . A bottom surface of the bottom board  41  is connected with an arc-shaped handle  47 . 
     Referring to  FIG. 2  and  FIG. 6 , the connecting cable  50  includes a plurality of core wires  51 . A front end of each of the core wires  51  has a conductive portion  52 . The clamping assembly  60  includes a fixing sleeve  61 , a locking ring  62 , a second fastening element  63  and a third fastening element  64 . The locking ring  62  shows a hollow shape. A diameter of a front periphery of the locking ring  62  is larger than a diameter of a rear periphery of the locking ring  62 . The rear end of the locking ring  62  defines a plurality of spaced notches  621 . A front periphery of the second fastening element  63  protrudes outward to form a resisting portion  631 . The second fastening element  63  defines a restricting groove  632  penetrating through a top and a front of the resisting portion  631 . The second fastening element  63  and the third fastening element  64  show hollow shapes. A front end of an inner periphery of the second fastening element  63  defines a plurality of first threads  633 . A rear end of an outer periphery of the third fastening element  64  defines a plurality of second threads  641 . 
     Referring to  FIG. 1  to  FIG. 9 , when the rotatable plug  100  is assembled, at first, the dynamic rotatable unit  20  is assembled. Specifically, the conductive pins  22  are fastened to the terminal board  21 , and top ends of the conductive pins  22  project beyond a top of the terminal board  21 . A bottom end of each of the conductive pins  22  projects under a bottom of the terminal board  21  and is fastened to a bottom of one end of one of the dynamic conductive tubes  23 . Top ends of the ground wire pin  221 , the neutral wire pin  222  and the live wire pin  223  project beyond the top of the terminal board  21  through the first insertion hole  212  and the second insertion holes  213  separately. Bottom ends of the ground wire pin  221 , the neutral wire pin  222  and the live wire pin  223  are located under the bottom of the terminal board  21 , and are fastened to a bottom of one end of the dynamic conductive tube of ground wire  25 , a bottom of one end of the dynamic conductive tube of neutral wire  26  and a bottom of one end of the dynamic conductive tube of live wire  27  separately. 
     The ground wire pin  221  is inserted into the first insertion hole  212 . The first insertion portion  206  passes through the first insertion hole  212  to project beyond a top of the first main board  210  of the terminal board  21 . The first fastening portion  205  is fastened in the first insertion hole  212 . The first contact portion  207  is located under the protruding pillar  201  of the terminal board  21 . The neutral wire pin  222  and the live wire pin  223  are respectively inserted into the second insertion holes  213 . The second insertion portions  225  respectively pass through the second insertion holes  213  to project beyond the top of the first main board  210  of the terminal board  21 . The second fastening portions  224  are fastened in the second insertion holes  213 . The second contact portions  226  of the neutral wire pin  222  and the live wire pin  223  are located under the protruding blocks  202  of the terminal board  21 . 
     The dynamic conductive tubes  23  are fastened to the bottom of the terminal board  21  and are spaced from one another. The first rotatable ring  251  is disposed around an outside of the first supporting column  214  along the guiding pillars  204 . A top sidewall of the first lacking groove  254  abuts against the first bearing portion  216 . The first connecting piece  252  is disposed under the protruding pillar  201  of the terminal board  21 , and the first connecting hole  253  is corresponding to the first insertion hole  212 . The first contact portion  207  passes through the first connecting hole  253  to be fastened under the first connecting piece  252 . 
     The dynamic conductive tube of neutral wire  26  is fastened to the bottom of the terminal board  21 . The second rotatable ring  261  is disposed around the outside of the first supporting portion  215 . The top periphery of the second rotatable ring  261  abuts against bottom surfaces of the second bearing portions  218 . Two opposite sidewalls of the second lacking groove  264  abut against two side surfaces of the two first abutting portions  217 . The second connecting piece  262  is disposed under one of the protruding blocks  202  of the terminal board  21 , and the second connecting hole  263  is corresponding to one of the second insertion holes  213 . The two second contact portions  226  of the neutral wire pin  222  pass through the second connecting hole  263  to be fastened under the corresponding second connecting piece  262 . 
     The isolating ring  24  is fastened to the bottom of the terminal board  21 , and the isolating ring  24  surrounds an outside of the second rotatable ring  261  of the dynamic conductive tube of neutral wire  26 . The main body  241  surrounds the outside of the second rotatable ring  261 . The locating piece  242  is disposed under the protruding pillar  201 , the two rectangular protruding blocks  202  and the locating pillar  219 . A front end of the first connecting piece  252  and the first contact portion  207  are respectively received in one of the holding grooves  244 . A front end of the second connecting piece  262  is received in the other holding groove  244 . The fourth connecting hole  275  is corresponding to the locating hole  246  and a middle of the locating pillar  219 . 
     The dynamic conductive tube of live wire  27  is fastened to the bottom of the terminal board  21 . The third rotatable ring  271  of the dynamic conductive tube of live wire  27  surrounds an outside of the isolating ring  24 . The third connecting piece  272  passes through the locating groove  245  to be disposed under the other protruding block  202  of the terminal board  21 , and the third connecting hole  274  is corresponding to the other second insertion hole  213 . The second contact portions  226  of the live wire pin  223  pass through the third connecting hole  274  to be fastened under the third connecting piece  272 . The fourth connecting piece  273  is disposed under the protruding pillar  201  of the terminal board  21 , and the first fastening element  28  passes through the fourth connecting hole  275 , the locating hole  246  and the middle of the locating pillar  219  to fasten the isolating ring  24 , the dynamic conductive tube of live wire  27 , the dynamic conductive tube of neutral wire  26  and the dynamic conductive tube of ground wire  25  to the bottom of the terminal board  21 . 
     Secondly, the static rotatable unit  30  is assembled. Specifically, the static conductive tubes  32  are fastened to the base  31  and are spaced from one another. The first contact arm  363 , the second contact arm  373  and the third contact arm  383  pass through three middles of the three wire clamps  33  separately, and then the first contact arm  363 , the second contact arm  373  and the third contact arm  383  together with the wire clamps  33  are assembled to the receiving grooves  308  separately. 
     The static conductive tube of ground wire  36  is fastened to the base  31 . The first ring body  361  is assembled inside the second supporting ring  315 , and a top periphery of the first ring body  361  abuts against a bottom of the third abutting portion  316 . The buckling portions  367  are buckled in the buckling grooves  302 . The first connecting arm  362  is located under the second main board  310 . The first contact arm  363  passes through the middle of the wire clamp  33 , and the first contact arm  363  together with the wire clamp  33  is assembled to the receiving groove  308  located at the middle of the rear end of the base  31 . The two first fastening arms  364  abut against two opposite sidewalls of the receiving groove  308 . Two opposite sides of the first blocking arm  365  abut against two inner surfaces of two opposite sides of a front sidewall of the receiving groove  308 . 
     The static conductive tube of neutral wire  37  is fastened to the base  31 . The second ring body  371  is accommodated in the accommodating space  314  and surrounds the second supporting ring  315 . The second fastening arm  374  is fastened in the fastening groove  303 . The second connecting arm  372  is assembled to one of the assembling grooves  304 . The second contact arm  373  passes through the middle of the wire clamp  33 , and the second contact arm  373  together with the wire clamp  33  is assembled to the receiving groove  308  located at one side of the rear end of the base  31 . Two opposite sides of the second blocking arm  375  abut against two inner surfaces of two opposite sides of a front sidewall of the receiving groove  308  located at one side of the rear end of the base  31 . 
     The static conductive tube of live wire  38  is fastened to the base  31 . The third ring body  381  is accommodated in the accommodating space  314  and is disposed around the two second supporting portions  317 . The third connecting arm  382  is assembled to the other assembling groove  304 . The third contact arm  383  passes through the middle of the wire clamp  33 , and the third contact arm  383  together with the wire clamp  33  is assembled to the receiving groove  308  located at the other side of the rear end of the base  31 . Two opposite sides of the third blocking arm  384  abut against two inner surfaces of two opposite sides of a front sidewall of the receiving groove  308  located at the other side of the rear end of the base  31 . The fixing arm  386  is accommodated in the accommodating space  314 . Each of the locking elements  35  passes through the locking hole  331  of one of the wire clamps  33  to be located under the first contact arm  363 , the second contact arm  373  and the third contact arm  383  separately. 
     The sealing element  34  is assembled in the base  31 , and is accommodated in the accommodating space  314 . The guiding portions  342  are slid into the guiding channels  307  along the guiding grooves  306  to guide the restraining portions  341  to be fastened in the restraining grooves  305 . The limiting portion  343  is located in front of the wire clamp  33 . The fixing arm  386  is fixed in the fixing groove  344 . The two limiting blocks  309  is located above the sealing portion  340  to limit the sealing element  34  in the accommodating space  314 . 
     Again, the dynamic rotatable unit  20  is pivotally mounted to the static rotatable unit  30 . The static rotatable unit  30  is pivotally mounted to a bottom of the dynamic rotatable unit  20  and is fastened to an inside of the lower cover  40 . Specifically, the blocking portion  211  of the terminal board  21  is disposed on the top surface of the connecting wall  313  and the top surface of the front end of the surrounding wall  311 . The first supporting column  214  and the first rotatable ring  251  of the dynamic conductive tube of ground wire  25  are together assembled in the first ring body  361  of the static conductive tube of ground wire  36 . The first ring body  361  surrounds and is electrically connected with an outside of the first rotatable ring  251 . The first supporting portion  215  is assembled between the first ring body  361  and the second ring body  371  of the static conductive tube of neutral wire  37 . The second rotatable ring  261  surrounds and is electrically connected with an outside of the second ring body  371 . The third rotatable ring  271  and the ring-shaped main body  241  of the isolating ring  24  are together assembled between the second ring body  371  and the third ring body  381  of the static conductive tube of live wire  38 . The third ring body  381  surrounds and is electrically connected with an outside of the third rotatable ring  271 . 
     The connecting cable  50  is fastened to the static rotatable unit  30 . Specifically, the conductive portions  52  of the core wires  51  of the connecting cable  50  separately project into the receiving grooves  308  to be located above the first contact arm  363 , the second contact arm  373  and the third contact arm  383 . The locking elements  35  pass through the locking holes  331  of the wire clamps  33  to lock the conductive portions  52  of the core wires  51  between the first contact arm  363  and the corresponding wire clamp  33 , between the second contact arm  373  and the corresponding wire clamp  33 , and between the third contact arm  383  and the corresponding wire clamp  33 , so that the conductive portions  52  of the core wires  51  electrically contact the first touching points  366  of the first contact arm  363 , the second touching points  376  of the second contact arm  373  and the third touching points  385  of the third contact arm  383  separately. 
     The clamping assembly  60  clamps the connecting cable  50 . Specifically, the fixing sleeve  61  is mounted around an outside of the connecting cable  50 . The locking ring  62  locks an outside of the fixing sleeve  61 . The second fastening element  63  is fastened to an outside of the locking ring  62 . The third fastening element  64  is screwed into the second fastening element  63 . The second threads  641  are engaged with the first threads  633  to make the third fastening element  64  fastened into the second fastening element  63  and the third fastening element  64  fastened to a rear end of the outside of the locking ring  62 . 
     At last, the upper cover  10  is covered on the dynamic rotatable unit  20 , the static rotatable unit  30 , the connecting cable  50  and the clamping assembly  60 . The blocking portion  211  is blocked against a bottom of a sidewall of the opening  111 . The top ends of the conductive pins  22  are exposed out of the upper cover  10  through the opening  111 . The first insertion portion  206  and each second insertion portion  225  are exposed out of the upper cover  10  through the opening  111 . A middle of each of the fastening rings  3111  is corresponding to a middle of one of the first fastening pillars  122 . The restricting block  125  is restricted in the restricting groove  632 . 
     The rotatable plug  100  further includes a plurality of fourth fastening elements  70  and a plurality of fifth fastening elements  80 . The fourth fastening elements  70  pass through the middles of the first fastening pillars  122  and the fastening rings  3111  to fasten the static rotatable unit  30  together with the dynamic rotatable unit  20  to the upper cover  10 . The lower cover  40  is fastened under the upper cover  10  to make the dynamic rotatable unit  20 , the static rotatable unit  30 , the front end of the connecting cable  50  and the front end of the clamping assembly  60  located between the upper cover  10  and the lower cover  40 . A middle of each of the second fastening pillars  123  is corresponding to a middle of one of the third fastening pillars  43 . A rear end of the connecting cable  50  projects out of the upper cover  10  and the lower cover  40 . 
     Each of the fifth fastening elements  80  passes through the middle of one of the second fastening pillars  123  and the middle of one of the third fastening pillars  43  to fasten the upper cover  10  to the lower cover  40 . The blocking rib  46  is blocked in the blocking groove  121 . Simultaneously, the dynamic rotatable unit  20 , the static rotatable unit  30 , a font end of the connecting cable  50  and a front end of the clamping assembly  60  are fastened between the upper cover  10  and the lower cover  40 . The first recess  124  is corresponding to the second recess  45 . The propping portions  44  prop up a bottom of the base  31 . The rear end of the connecting cable  50  and a rear end of the clamping assembly  60  pass through the first recess  124  and the second recess  45  to project out of the upper cover  10  and the lower cover  40 . A top end of the resisting portion  631  is blocked against a rear surface of a sidewall of the first recess  124 , and a bottom end of the resisting portion  631  is blocked against a rear surface of a sidewall of the second recess  45 . So the clamping assembly  60  clamps the connecting cable  50  and is fastened to the upper cover  10  and the lower cover  40 . 
     Referring to  FIG. 1  to  FIG. 10 , when the rotatable plug  100  is unused, the dynamic rotatable unit  20  is capable of being rotated to make the first rotatable ring  251  of the dynamic conductive tube of ground wire  25  rotate 360 degrees around the first ring body  361  of the static conductive tube of ground wire  36 , make the second ring body  371  rotate 360 degrees around the second rotatable ring  261 , and make the third rotatable ring  271  rotate 360 degrees around the third ring body  381  so that the dynamic rotatable unit  20  is capable of rotating to the required angle. The upper cover  10 , the static rotatable unit  30 , the lower cover  40  and the clamping assembly  60  are capable of rotating 360 degrees along a traction direction of the connecting cable  50 . Simultaneously, the first ring body  361  of the static conductive tube of ground wire  36  rotates 360 degrees around the first rotatable ring  251  of the dynamic conductive tube of ground wire  25 , and the second rotatable ring  261  rotates 360 degrees around the second ring body  371  and the third ring body  381  rotates 360 degrees around the third rotatable ring  271 . And the upper cover  10 , the static rotatable unit  30 , the lower cover  40 , the clamping assembly  60  and the connecting cable  50  are capable of proceeding the same angle rotation. 
     Referring to  FIG. 1  to  FIG. 10 , when the rotatable plug  100  is in use, after the rotatable plug  100  is inserted into a socket (not shown), the first insertion portion  206  and each second insertion portion  225  are inserted into the socket, the socket is immovable and the rotatable plug  100  is fastened to the socket. In order to achieve a use convenience, it is often needed to twist the connecting cable  50  of the rotatable plug  100 . The upper cover  10 , the static rotatable unit  30 , the lower cover  40  and the clamping assembly  60  are capable of rotating 360 degrees along the traction direction of the connecting cable  50 . Simultaneously, the first ring body  361  of the static conductive tube of ground wire  36  rotates 360 degrees around the first rotatable ring  251  of the dynamic conductive tube of ground wire  25 , and the second rotatable ring  261  rotates 360 degrees around the second ring body  371  and the third ring body  381  rotates 360 degrees around the third rotatable ring  271 . And the upper cover  10 , the static rotatable unit  30 , the lower cover  40 , the clamping assembly  60  and the connecting cable  50  are capable of proceeding the same angle rotation. When the upper cover  10 , the static rotatable unit  30 , the lower cover  40  and the clamping assembly  60  are rotated, the handle  47  is capable of being pulled upward to rotate the lower cover  40  for bringing along the upper cover  10 , the static rotatable unit  30  and the clamping assembly  60  to rotate together. 
     When it is needed to pull out the rotatable plug  100 , the handle  47  is capable of being pulled upward for making the rotatable plug  100  pulled out successfully. 
     As described above, the upper cover  10 , the static rotatable unit  30 , the lower cover  40  and the clamping assembly  60  are capable of rotating 360 degrees along the traction direction of the connecting cable  50 , and the upper cover  10 , the static rotatable unit  30 , the lower cover  40 , the clamping assembly  60  and the connecting cable  50  are capable of proceeding the same angle rotation. So that it&#39;s easier to keep the connecting cable  50  connected with the static rotatable unit  30  in good shape for ensuring an electrical performance stability and a usage convenience of the rotatable plug  100 .