Abstract:
A universal electrical plug includes a first support, a second support, outer electrode slats, and inner electrode slats. An axis is defined from the second support to the first support. The outer and inner electrode slats are arranged on the second support, surround the axis, and extend to the first support in a direction parallel to the axis. The outer electrode slats are arranged on the second support and surround the inner electrode slats. Each outer electrode salt includes an outer deforming section bulged from the axis to fit insert holes of the electrical sockets with different sizes. Each inner electrode slate includes an inner deforming section depressed toward the axis to fit the electrode cores of the electrical sockets with different sizes. Through the outer and the inner electrode slats, the universal electrical plug is able to be adapted to the electrical sockets with different geometry specifications.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to electrical plugs, and more particularly to a universal electrical plug adapted to the electrical sockets with different sizes. 
   2. Related Art 
   Referring to  FIG. 1 , an electrical plug  1  in the prior art is disposed at an end of a power output cable of an electric transformer or a power supplier. The electrical plug is utilized to be inserted a corresponding electrical socket to electrically connect the electric transformer or the power supplier to the electrical socket, therefore supplying power to the electronic device equipped with the electrical socket. 
   Referring to  FIG. 2 , the electrical plug  1  includes a base portion  2 , an outer sleeve  3 , an inner sleeve  4 . The base portion  2  is made of electrical insulating medium, and an end of the outer sleeve  3  is connected to the base portion  2 . The inner sleeve  4  is disposed inside the outer sleeve  3 , and the outer sleeve  3  and the inner sleeve  4  are spaced by an insulating ring  5  to prevent the outer sleeve  3  and the inner sleeve  4  from contacting each other. The electrical plug  1  further includes two leads  6 ,  7 , buried in the base portion  2 . The lead  6  is electrically coupled to the outer sleeve  3  while the lead  7  is electrically coupled to the inner sleeve  4 , so as to connect the outer sleeve  3  and the inner sleeve  4  to the power output cable of the electric transformer or the power supplier. 
   Referring to  FIG. 2 , the electrical socket  8  corresponding to the electrical plug  1  includes a body  9 , a conductive pin  10 , and a plurality of contact reeds  11 . The body  9  includes an inserted hole  12 , and the conductive pin  10  is disposed at the bottom end of the inserted hole  12  of the inserted hole  12  and extends outwards in a central axis of the inserted hole  12 . The contact reeds  11  are embedded on an inner wall of the inserted hole  12 , and part of or the whole contact reed  11  protrudes beyond the inner wall of the inserted hole  11 . 
   The following conditions are required for the sizes of the electrical plug  1  and the electrical socket  8  to inserting the electrical plug  1  into the electrical socket  8  and electrically connect the electrical plug  1  into the electrical socket  8 . Firstly, the outer diameter of the outer sleeve  3  has to be smaller than or equal to the internal diameter of the inserted hole  12 , so as to insert the outer sleeve  3  into the inserted hole  12 . Furthermore, the external diameter of the outer sleeve  3  has to be large enough for the contact reed  11  to contact and clamp the outer sleeve  3 . Secondly, the internal diameter of the inner sleeve  4  has to be slightly large the external diameter of the conductive pin  10 , so as to insert the conductive pin  10  into the inner sleeve  4  to have the conductive pin  10  contacting and electrically connecting to the inner sleeve  4 . 
   Referring to  FIG. 2 , the geometry specification of the electrical plug  1  has to match that of the electrical socket  8 . If the internal diameter of the inserted hole  12 ′ of an electrical socket  8 ′ is to smaller than the external diameter of the outer sleeve  3 , the outer sleeve  3  of the electrical plug  1  can not be inserted into the inserted hole  12 ′. On the contrary, if the inserted hole  12 ′ of the electrical socket  8 ′ is too large, the outer sleeve  3  can be inserted into the inserted hole  12 ′. However, under such condition, the outer sleeve  3  may not continuously contact with the contact reeds  11 ′, or the outer sleeve  3  may not be fixed in the inserted hole  12 ′ by the contact reeds  11 ′. Similarly, if the external diameter of the conductive pin  10 ′ of the electrical socket  8 ′ is larger than the internal diameter of the inner sleeve  4 , the conductive pin  10 ′ of the electrical plug  1  can not be inserted into the inner sleeve  4 . On the contrary, if the external diameter of the conductive pin  10 ′ is too small, the conductive pin  10 ′ will not well contact with the inner sleeve  4  after the conductive pin  10  is inserted into the inner sleeve  4 . According to the abovementioned reasons, every electric transformer or power supplier can only match one or a few types of electrical sockets  8  having matched geometry specifications. To electrical sockets  8 ,  8 ′ having different geometry specifications, manufacturers of electronic devices have to reserve large amount of the electrical plugs  1  having different geometry specifications even the electrical specification of each electric transformer or power supplier can match the requirement of various types of electronic devices. 
   To solve the aforementioned problems, a solution in the prior art is to utilize detachable electrical plugs in electrical transformers or power suppliers. Such kind of electrical plug can be detached from the end power cable and replaced by another electrical plug having suitable geometry specification. However, the abovementioned solution has another problem that the user may lost the detachable electrical plugs detached from the power cable. Therefore, the electrical transformer or the power supplier may not be used any more if the frequently used detachable electrical plug is lost. 
   SUMMARY OF THE INVENTION 
   The present invention provides a universal electrical plug to solve the abovementioned problems in the prior art. 
   The universal electrical plug according to the present invention includes a first support, a second support, outer electrode slats, and inner electrode slats. An axis is defined from the second support to the first support. The outer and inner electrode slats are arranged on the second support, surround the axis, and extend to the first support in a direction parallel to the axis. The outer electrode slats are arranged on the second support and surround the inner electrode slats. Each outer electrode salt includes an outer deforming section bulged from the axis to fit insert holes of the electrical sockets with different sizes. Each inner electrode slate includes an inner deforming section depressed toward the axis to fit the electrode cores of the electrical sockets with different sizes. Through the outer and the inner electrode slats, the universal electrical plug is able to be adapted to the electrical sockets with different sizes. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will become more fully understood from the detailed description given herein below for illustration only, and thus not limitative of the present invention, wherein: 
       FIG. 1  is a perspective view of an electrical plug in the prior art; 
       FIG. 2  is cross-sectional view of the electrical plug inserted into an electrical socket in the prior art; 
       FIG. 3  is an exploded view of an according to a first embodiment of the present invention; 
       FIG. 4  is perspective view of the universal electrical plug and an electrical socket according to the first embodiment of the present invention; 
       FIG. 5  and  FIG. 6  are planar views of the outer electrode slat being unfold according to the first embodiment of the present invention; 
       FIG. 7  and  FIG. 8  are planar views of the inner electrode slat being unfold according to the first embodiment of the present invention; 
       FIG. 9  is a cross-sectional view according to the first embodiment of the present invention, showing the universal electrical plug and the electrical socket to illustrate the geometry specifications of the electrical socket that adapts the universal electrical plug: 
       FIG. 10  and  FIG. 11  are cross-sectional views according to the first embodiment of the present invention, showing the universal electrical plug and the electrical socket to illustrate inserting the electrical plug into the electrical socket: and 
       FIG. 12  is cross-sectional view of a universal electrical plug according to the first embodiment of the present invention. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring to  FIG. 3  and  FIG. 4 , a universal electrical plug  100  according to a first embodiment of the present invention is show. The universal electrical plug  100  is able to be adapted to electrical sockets  200  with different geometry specifications. The universal electrical plug  100  includes a first support  110 , a second support  120 , a plurality of outer electrode slat  130 , and plurality of inner electrode slat  140 . 
   Referring to  FIG. 3  and  FIG. 4 , the first support  110  is spaced from the second support  120 . The configuration of the first support  110  can be annular, circle, or any other configuration. The configuration of the second support  120  can be any other configuration, and circle is preferred. The second support  120  includes a through hole  121 . The first support  110  and the second support  120  are both made of electrical insulating medium, and are spaced from each other. An axis C is defined from the through hole  121  of the second support  120  to the first support  110 . 
   Furthermore, the second support  120  includes an outer annular slot and an inner annular slot  123 . The inner annular slot  123  surrounds through hole  121  and is located near an edge of the through hole  121 . The outer annular slot  122  surrounds the inner annular slot  123  and is located near an edge of the second support  120 . 
   Referring to  FIG. 3  and  FIG. 4 , the inner electrode slats  140  are juxtaposed on second support  120  to surround the through hole  121 , and each inner electrode slat  140  extend from the second support  120  to the first support  110  in a direction parallel to the axis. Two ends of each inner electrode slat  140  are connected to the first support  110  and the second support  120  respectively. Each of the inner electrode slats  140  includes an inner deforming section  142  in the middle. The end of each inner electrode slat  140  connected to the second support  120  is defined as a first end  141 , and the end of each inner electrode slat  140  connected to the first support  110  is defined as a third end  143 . The term “in the middle” is not restricted to the midpoint of each inner electrode slat  140 , the term “in the middle” is any section between the first end  141  and the third end  143 . 
   If the inner deforming section  142  is freely without being forced, the distance from the inner deforming section  142  to the axis C is normally smaller than the distance from the first end  141  to the axis C or the distance from the third end  143  to the axis C. That is, each inner deforming section  140  is a curved structure depressed toward the axis C. Moreover, each inner electrode slat  140  is made of electrical conductive and elastic material. Therefore each inner deforming section  142  can be forced to be deformed to change the distance from each inner deforming section  142  to the axis C. 
   The universal electrical plug  100  further includes a connection piece  144  and an inner welded bond  145 . The inner welded bond  145  extends from the connection piece  144  and runs through the first support  110  through an inner slit  112 , so as to fixing the connection piece  144  on a side surface of the first support  110  facing the second support  120 . 
   The third end  143  of each inner electrode slat  140  extends from an edge of the connection piece  144  to connect the third end  143  to the first support  110 . Moreover, the inner welded bond  145  is provided for a wire (not shown in the figures) to be welded thereon, and the wire is used to supply electrical power to each inner electrode slat  140 . The first end  141  of each inner electrode slat  140  is inserted into inner annular slot  123  to connect the first end  141  to the second support  120 . 
   Referring to  FIG. 3  and  FIG. 4 , the outer electrode slats  130  are juxtaposed on second support  120  and surround through hole  121 . Each of the outer electrode slats  130  extends to the first support  110  in a direction parallel to the axis C. Two end of each outer electrode slat  130  are connected to the first support  110  and the second support  120  respectively. A distance from each of the outer electrode slats  130  to the through hole  121  is slightly larger than the distance from each of the inner electrode slats  140  to through hole  121 , therefore the outer electrode slats  130  surround the inner electrode slats  140 . 
   Each of the outer electrode slats  130  includes an outer deforming section  131  in the middle. The end of each outer electrode slat  130  connected to the second support  120  is defined as a second end  132 , and the end of each outer electrode slat  130  connected to the first support  110  is defined as a fourth end  134 . The term “in the middle” is not restricted to the midpoint of each outer electrode slat  130 , the term “in the middle” is any section between the second end  132  and the fourth end  134 . 
   If the outer deforming section  131  is freely without being forced, the distance from the outer deforming section  131  to the axis C is normally larger than the distance from the second end  132  to the axis C or the distance from the fourth end  134  to the axis. That is, the outer deforming section  131  is a curved structure bulged out from the axis C. Moreover, each outer electrode slat  130  is made of electrical conductive and elastic material. Therefore, each inner deforming section  131  can be forced to be deformed to change the distance from each outer deforming section  131  to the axis C. 
   The universal electrical plug  100  further includes a connecting ring  135  and an outer welded bond  136 . The connecting ring  135  has a cannular area  133   a . The outer welded bond  136  extends from the connecting ring  135  and runs through the first support  110  through a outer slit  111 , so as to fix the connecting ring  135  on a side surface of the first support  110  facing the second support  120 . 
   The fourth end  134  of each outer electrode slat  130  extends from an edge of the connecting ring  135  to connect the fourth end  134  to the first support  110 . Moreover, the connection piece  144  fixed to the first support  110  is located in the cannular area  135   a  without electrically connection to the connecting ring  135 . Therefore, the outer electrode slats  130  are electrical insulated from the inner electrode slats  140 . Moreover, the outer welded bond  136  is provided for a wire (not shown in the figures) to be welded thereon, and the wire is used to supply electrical power to each outer electrode slat  130 . The second end  132  of each outer electrode slat  130  is inserted into the outer annular slot  122  to connect the second end  132  to the second support  120 . 
   Referring to  FIG. 5  and  FIG. 6 , the connecting ring  135  and the outer electrode slat  130  are formed monolithically. To manufacture the connecting ring  135  and the outer electrode slat  130 , a metal thing plate is cut to have the outer electrode slats  130  extend from an edge of the connecting ring  135  in a radial manner. Then, each outer electrode slat  130  is folded to form the outer deforming section  131 , the second end  132 , and the fourth end  134 . 
   Referring to  FIG. 5  and  FIG. 6 , the amount of the outer electrode slats  130  is eight in the first embodiment. However, the amount “eight” is not a limitation of the present invention. The amount of the outer electrode slats  130  may be any amount. In practice, three or more than three outer electrode slats  130  are preferred, as shown in  FIG. 6 . 
   Referring to  FIG. 7  and  FIG. 8 , the connection piece  144  and the inner electrode slats  140  are formed monolithically. To manufacture the connection piece  144  and the inner electrode slats  140 , metal thing plate is cut to have the inner electrode slats  140  extend from an edge of the connection piece  144  in radial manner. Then, each inner electrode slat  140  is folded to form the inner deforming section  142 , the first end  141 , and the third end  143 . 
   Referring to  FIG. 7  and  FIG. 8 , the amount of the inner electrode slats  140  is eight in the first embodiment. However, the amount “eight” is not a limitation of the present invention. The amount of the inner electrode slats  140  may be any amount. In practice, three or more than three inner electrode slats  140  are preferred, as shown in  FIG. 8 . 
   Referring to  FIG. 3 ,  FIG. 4 , and  FIG. 9 , the outer electrode slats  130  are juxtaposed on the second support  120 , surround the through hole  121 , and extend in the direction parallel the axis C. A plurality of external diameters can be defined in the outer deforming sections  131  that surround the axis C. Among the aforementioned external diameters, a largest external diameter R 1  exists. The inner electrode slats  140  are juxtaposed on the second support  120 , surround the through hole  121 , and extend in the direction parallel the axis C. Moreover, the inner electrode slats  140  are surrounded by the outer electrode slats  130 . A plurality of internal diameters can be defined in the inner deforming sections  142  that surround the axis C. Among aforementioned the internal diameters, a smallest internal diameter R 2  exist. 
   The electrical socket  200  includes a body  210 , a conductive pin  220 , and a plurality of contact reeds  230 . The body  210  has an inserted hole  211 . The conductive pin  220  is disposed at bottom of the inserted hole  211  and extends outwards. The contact reeds  230  are embedded on an inner wall of the inserted hole  211 , and part of or the whole contact reed  230  protrudes beyond the inner wall of the inserted hole  211 . The electrical conductivity paths of the conductive pin  220  and the contact reeds  230  extend outside the body  210  through leads  240 ,  250 . And the leads  240 ,  250  are provided to be welded on a PCB, so as to mount the electrical socket  200  on the PCB. 
     FIG. 9  illustrates the geometry specifications of the electrical sockets  200 ,  200 ′ that adapts the universal electrical plug  100  of the present invention. The largest external diameter R 1  of the deforming sections  131  is larger than the bore diameter of the inserted hole  211 ,  211 ′ of the body  210 . Meanwhile, the smallest internal diameter R 2  of the inner deforming sections  142  is smaller than the diameter of the conductive pin  220 ,  220 ′. As long as the geometry specifications of the electrical sockets  200 ,  200 ′ match the abovementioned conditions, the universal electrical plug  100  of the present invention can be inserted into the inserted hole  211  to electrically connect the universal electrical plug  100  to the electrical sockets  200 ,  200 ′. 
   Referring to  FIG. 10  and  FIG. 11 , when universal electrical plug  100  is inserted into the inserted hole  211  of the electrical socket  200 , the second support  120  enters the inserted hole  211  at first, to have the conductive pin  220  runs through the second support  120  through the through hole  121 , and then the second support  120  moves to the space surrounded by the inner electrode slats  140 . Since the diameter of the conductive pin  220  is larger than the internal diameter R 2  of the inner deforming sections  142 , the conductive pin  220  contact the inner deforming sections  142  of the inner electrode slats  140 . Moreover, the conductive pin  220  presses and forces the inner deforming sections  142  to be deformed outward. Meanwhile, the outer deforming sections  131  of the outer electrode slats  130  are pressed and forced to be deformed inwards by the inner wall of the inserted hole  211  or the contact reeds  230 . The outer electrode slats  130  are forced to contact the inner wall of the inserted hole  211  or the contact reeds  230 , therefore, at least one outer electrode slats  130  normally contact the contact reeds  230 . As long as the bore diameter of the inserted hole  210  is smaller than the largest external diameter R 1  and the diameter of the conductive pin  220  is larger the smallest internal diameter R 2 , the universal electrical plug  100  is fixed in the inserted hole  211 , and the inner electrode slats  140  and outer electrode slats  130  are electrical connected to the conductive pin  220  and the contact reeds  230  respectively. The range of the bore diameter of the inserted hole  211  corresponding to outer electrode slats  130  is enlarged, while the range of the diameter of the conductive pin  220  corresponding to the inner electrode slats  140  is enlarged. Therefore, the universal electrical plug of the present invention is able to be adapted to the electrical sockets  200 ,  200 ′ with different geometry specifications. 
   Referring to  FIG. 12 , a universal electrical plug  400  according to a second embodiment of the present invention includes a first support  410 , a second support  420 , a plurality of outer electrode slats  430 , and a plurality of inner electrode slats  440 . The details of first support  410  and the second support  420  are similar to those of the first embodiment and will not be described again here after. 
   The inner electrode slats  440  are juxtaposed on the second support  420  and surround the through hole  421 . Each inner electrode slat  440  extends from the second support  420  to the first support  410  in a direction parallel to the axis C. Each of the inner electrode slats  440  includes a plurality of serial connected inner deforming sections  442  in the middle of the inner electrode slat. The end of each inner electrode slat  440  connected to the second support  420  is defined as a first end  441 , and the end of each inner deforming section  442  connected to the first support  410  is defined as a third end  443 . the term “in the middle” is not restricted to the midpoint of each inner electrode slat  440 , the term “in the middle” is any section between the first end  441  and the third end  443 . The first end  441  and the second end is connected to the second support  420  and the first support  410  respectively, and the distance from each inner deforming section  442  to the axis C is smaller than the distance from the first end  441  to the axis C. Moreover, each inner deforming section  442  is deformable to change the distance from each inner deforming section  442  to axis C. 
   The outer electrode slats  430  are juxtaposed on second support  420  and surround the through hole  421 . Each of the outer electrode slat  430  extends to the first support  410  in a direction parallel the axis C. The distance from each outer electrode slat  430  to the through hole  421  is slightly larger than the distance from the inner electrode slat  440  to the through hole  421 , therefore, the outer electrode slats  430  surround the inner electrode slat  440 . 
   Each outer electrode slat  430  includes a plurality of serial connected outer deforming section  431  in the middle of the outer electrode slat  430 . The end of each outer electrode slat  430  connected to the second support  420  is defined as a second end  432 , and the end of the outer electrode slat  430  connected to the first support  410  is defined as a fourth end  434 . The term “in the middle” in not restricted to the midpoint of the out electrode slat  430 , the term “in the middle” is any section between the second end  432  and the fourth end  434 . If each outer deforming section  431  is not forced, the distance from the outer deforming section  431  to the axis C is normally larger than the distance from the second end  432  to the axis C or the distance from the fourth end  434  to the axis C. And each outer deforming section  431  is deformable to change the distance from the outer deforming section  431  to the axis C. 
   Through bulged out outer deforming sections and depressed inner deforming sections, the universal electrical plug according to one or more embodiments of the present invention matches various geometry specifications of the electrical sockets, that is, the universal electrical plug is able to be adapted to the electrical sockets with different geometry specifications.