Patent Publication Number: US-2010123539-A1

Title: Transformer

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the invention 
     The invention generally relates to an improved transformer. More particularly, the invention relates to an improved transformer, in which the bending of the wire may be reduced and the wires are allowed to run closely and neatly on the surfaces of the main body. Therefore, breakage may be avoided and quality of the transformer may be improved. 
     2. Description of the Prior Art 
     The coil type transformer has been around for more than 100 years. Many improvements and modifications have been made to improve the coil type transformer. Despite these improvements and modifications, the coil type transformer operates according to the same physical principle, mutual induction. 
     In the coil type transformer, mutual induction occurs if an emf is induced in a coil because of current changes in a second coil. A primary coil and the secondary coil are wound around the same iron core. The primary coil is connected to the source of electrical energy and the secondary coil is connected to a load. When ac is applied to the primary coil, changes in magnetic flux would occur in the iron core and the changes would cause an ac with the same frequency in the secondary coil. The ratio of primary voltage (or emf) to secondary voltage (or emf) is in proportional to the ratio of the number of turns on the primary coil to the number of turns on the secondary coil. Therefore, if the number of turns on the secondary coil is more than the number of turns on the primary coil, the output voltage is greater than the input voltage and it is called a step-up transformer; conversely, if the number of turns on the secondary coil is less than the number of turns on the primary coil, the output voltage is less than the input voltage and it is called a step-down transformer. 
     Therefore, coils are the most important parts of the coil type transformer. In addition to the quality of the wires, how winding is done is quiet important. Please see  FIG. 4 , which is a bottom view illustrating the secondary winding in the transformer of the prior art. The transformer has a main body  3 . The main body  3  has a primary winding partition  31  and several secondary winding partitions  32 . A secondary wire  42  is wound around the core on the secondary winding partitions  32 . One end of the secondary wire  42  passes the primary winding partition  31  and the primary end piece  311  and then is connected to one of several primary leads  312 . Next, the primary wire  41  is wound around the iron core on the primary winding partition  31 . 
     The aforementioned secondary wire  42  is usually a very thin wire; therefore, if the winding of the secondary wire  42  is not done meticulously, the secondary wire  42  is prone to breakage and short circuit. As the secondary wire  42  runs from the primary lead  312  to the primary end piece  311 , because of the difference in height between the primary lead  312  and the primary end piece  311 , the secondary wire  42  tends not to rest closely to the surface of the primary end piece  311  and is prone to the breakage caused by the edge of the primary end piece  311 . Such breakage may lead to the disconnection of the wire. Moreover, the primary lead  312  is usually a thin metal piece and is prone to deformation and breakage if it is pulled by the wire  42  or is bumped by an external force; in such case, quality of the transformer suffers. 
     In addition, as previously mentioned, because the secondary wire  42  tends not to rest closely to the surface of the primary end piece  311 , the wire  42  is prone to bending and breakage after the primary wire  41  is wound on top of the wire  42 . Such bending and breakage leads to the damage of the transformer. 
     From the above, we can see that the transformer of the prior art has many disadvantages and drawbacks and needs to be improved. 
     To eliminate the disadvantages of the transformer of the prior art, the inventor has put a lot of effort into the subject and has successfully come up with the improved transformer of the present invention. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide an improved transformer in which a rubber piece is fitted on at least one surface of one of several primary leads to strengthen the primary lead and to avoid the bending and breakage of the primary lead so that the transformer may have a longer service life. 
     Another object of the present invention is to provide an improved transformer in which the rubber piece fitted on at least one surface of one of several primary leads enables the secondary wire to run closely and neatly on the surface of the rubber piece and the primary end piece to avoid bending and breakage. 
     A third object of the present invention is to provide an improved transformer in which a wire-guiding groove is formed in the primary end piece to guide the secondary wire to run closely and neatly on the lower surface of the primary winding partition. Therefore, quality of the transformer may be improved. 
     To reach these objects, the improved transformer of the present invention is disclosed. The improved transformer of the present invention comprises a main body, at least a rubber piece and a wire-guiding groove. The main body has a primary winding partition, several secondary winding partitions and two end portions. Several leads are disposed in either end portion. One end of the secondary wire goes from the primary lead to the primary end piece and the primary winding partition. The rubber piece is fitted on at least one surface of one of several primary leads. The rubber piece can strengthen the primary lead and enables the secondary wire to run closely and neatly on the surface of the rubber piece and the primary end piece. A wire-guiding groove is formed in the primary end piece to guide the secondary wire to run closely and neatly on the lower surface of the primary winding partition. As the secondary wire goes from the primary lead to the primary end piece, the rubber piece enables the secondary wire to run closely and neatly on the surface of the rubber piece and primary end piece to avoid the breakage caused by the edge of the primary end piece. Also, the wire-guiding groove enables the secondary wire to run closely and neatly on the lower surface of the primary winding partition before the secondary wire reaches the secondary winding partitions. Therefore, quality and durability of the transformer may be improved or enhanced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view illustrating the main body of the improved transformer of the present invention. 
         FIG. 1A  is an enlarged view illustrating a primary lead fitted with a rubber piece in the improved transformer of the present invention. 
         FIG. 2  is a perspective bottom view illustrating the main body of the improved transformer of the present invention. 
         FIG. 2A  is an enlarged view illustrating a primary lead fitted with a rubber piece in the improved transformer of the present invention. 
         FIG. 3  is a bottom view illustrating the secondary winding in the improved transformer of the present invention. 
         FIG. 4  is a bottom view illustrating the secondary winding in the transformer of the prior art. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Please refer to  FIGS. 1 to 3 , which illustrate the improved transformer of the present invention. The improved transformer of the present invention comprises a main body  1 , at least a rubber piece  13  and a wire-guiding groove  14 . A primary winding partition  11  and several secondary winding partitions  12  are formed on the main body  1 . A primary winding/wire  21  is wound around the iron core on the primary winding partition  11  and a secondary winding/wire  22  is wound around the iron core on the secondary winding partitions  12 . One end of the secondary wire  22  goes to a primary end piece  111 , which is disposed by the primary winding partition  11 , and then is connected to one of several primary leads  112 . Next, the primary wire  21  is wound around the iron core on the primary winding partition  11 . 
     The key point of the present invention is the rubber piece  13  fitted on at least one surface of one of several primary leads  112 . The rubber piece  13  can strengthen the primary lead  112 . In addition, as the secondary wire  22  goes from the primary lead  112  to the primary end piece  111 , the rubber piece  13  enables the secondary wire  22  to run closely and neatly on the surface of the rubber piece  13  and primary end piece  111  to avoid the breakage caused by the edge of the primary end piece  111 . 
     In the same manner, the rubber piece  13  may be fitted on at least one surface of one of several primary leads  122 . 
     In addition, a wire-guiding groove  14  is formed in the primary end piece  111 . The wire-guiding groove  14  can guide the secondary wire  22  when the secondary wire  22  runs from the secondary winding partitions  12  to the primary winding partition  11  and the primary end piece  111  to reduce the bending of the secondary wire  22  and to keep the secondary wire  22  running closely and neatly on the lower surface of the primary winding partition  11 . Therefore, the wire-guiding groove  14  can guide the passage of the secondary wire  22  through the primary winding partition  11 . Similarly, the wire-guiding groove  14  may be formed in the secondary end piece  121 . 
     In comparison to the transformer of the prior art, the improved transformer of the present invention has the following advantages: 
     1. The improved transformer of the present invention has a higher quality and a longer service life because the secondary wire is not prone to bending and breakage caused by the edge of the primary end piece. 
     2. In the improved transformer of the present invention, the quality and stability may be improved because the bending of the secondary wire may be reduced and the secondary wire may run closely and neatly on the lower surface of the primary winding partition when the secondary wire runs from the secondary winding partitions to the primary winding partition. 
     Although a preferred embodiment of the present invention has been described in detail hereinabove, it should be understood that the preferred embodiment is to be regarded in an illustrative manner rather than a restrictive manner, and all variations and modifications of the basic inventive concepts herein taught still fall within the scope of the present invention.