Abstract:
An improved SMA (SUB-MINIATURE) connector structure, particularly one that utilizes an insert ring member inserted into a receiving hole in a T-shaped connector to quickly insert and retain an insulation member in the T-shaped connector to thereby achieve, a connector that has advantages of quick assembly and reduced costs.

Description:
BACKGROUND OF THE INVENTION 
     (a) Field of the Invention 
     The present invention relates to an improvement in the SMA (SUB-MINIATURE) connector structure. 
     (b) Description of the Prior Art 
     With the advance of technology, there are demands for compact and quality products. Quick assembly and low costs are objects of developing new products, for example, manufacturers of coaxial cable connectors focus on developing connectors that are quick to assembly and inexpensive to manufacture. With reference to FIG. 1, the; middle portion of a T-shaped connector  11  is provided with a receiving hole  111 ′. An exit  113 ′ at the bottom portion of the receiving hole  111 ′ has a diameter smaller than an entrance  112 ′ thereof. The receiving hole  111 ′ is sized to receive an insulation member  14 ′ having a wire hole  141 ′ in the middle portion thereof. a lateral annular edge of the insulation member  14 ′ abuts against an annular edge wall of the exit  113 ′ . Upper and lower opposed injection holes  15 ′ are formed in the T-shaped connector  11 ′ at positions corresponding to the lateral edge of the insulation member  14 ′ in the receiving hole  111 ′. A plastic substance  118 ′ is injected via the injection hole  15 ′ to adhere the insulation member  14 ′ firmly in the receiving hole  111 ′. With reference to FIG. 2, the middle portion of a T-shaped connector  11 ′ is provided with a receiving hole  111 ′. The rear end of the inner edge of the interior of the receiving hole  111 ′ is provided with an insert ring wall  116 ′ that has a diameter smaller than that of the receiving hole  111 ′ and that projects inwardly The rear end of the insert ring wall  116 ′ is pre-formed with an insert hole  117 ′. An insulation member  14 ′ having a wire hole  141 ′ in the middle portion thereof is disposed in the receiving hole  111 ′. An insert ring member  12  is retained on an outer edge face projecting from he insulation member  14 ′, and is inserted into the insert hole  117 ′ in the rear end of ′ the receiving hole′  111 ′ to thereby retain the insulation member  14 ′ in the receiving hole  111 ′. There are drawbacks with these two types of assembly. First, forming two injection holes in the T-shaped connector and injecting a plastic substance to secure the insulation member is not only laborious and time-consuming, the assembly efficiency is low. As for the other method of assembly, it is also time-consuming and laborious to drill an insert hole in the receiving hole in one side of the T-shaped connector. Besides, since it requires secondary processing, it is not economical. Furthermore, whether hole drilling or rear insertion is adopted, the connector is not pleasing in appearance. 
     SUMMARY OF THE INVENTION 
     The present invention relates to an improvement in the SMA (SUB-MINIATURE) connector structure. 
     It is the primary object of the present invention to provide an improved SMA (SUB-MINIATURE) connector structure, particularly one that utilizes an insert ring member inserted into a receiving hole in a T-shaped connector to quickly insert and retain an insulation member in the T-shaped connector to thereby achieve a connector that has advantages of quick assembly and reduced costs. 
     The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a sectional view of a conventional product; 
     FIG. 2 is an exploded perspective view of another conventional product; 
     FIG. 3 is an exploded perspective view of the present invention; 
     FIG. 4 is an assembled perspective view of the present invention; and 
     FIG. 5 is an assembled sectional view of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings. Specific language will be used to describe same. It will, nevertheless, be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated device, and such further applications of the principles of the invention as illustrated herein being contemplated as would normally occur to one skilled in the art to which the invention relates. 
     With reference to FIGS. 3 to  5 , the present invention includes a T-shaped connector  11 , an insert ring member  12 , and an insulation member  13 . The T-shaped connector  11  is generally T-shaped and includes a through receiving hole  111  in a middle portion thereof. An entrance  112  having a diameter slightly greater than that of the receiving hole  111  and an insert ring wall  114  are provided at the entrance  112  of the inner edge of the interior of the receiving hole  111  at suitable positions. The other end of the receiving hole  111  is provided with an exit  113  of a diameter slightly smaller than that of the receiving hole  111 . The size of the receiving hole  111  may just receive the insulation member  13  disposed therein, and the size of the insulation member  13  is such that it can be insertably retained in the exit  113  at one end of the receiving hole  111  so that a lateral edge of an enlarged portion  131  at one end of the insulation member  13  may just abut against a wall edge of the receiving hole  111 . 
     The insert ring member  12  is substantially hollow and tapered. The insert ring member  12  is sized to be insertable into the entrance  112  at one end of the receiving hole  111 . A middle portion of the insert ring member  12  is provided with an insert wall  121  at a suitable, position such that the smaller diameter portion of the insert ring member  12  is insertedly disposed on an annular ring at one end of the insulation member  13  surrounded by the interior of the entrance  112  of the receiving hole  111 , and the insert wall  121  of the insert ring member  12  abuts against the insert ring wall  114  at the inner edge of the entrance  112  of the receiving hole  111 . 
     The insulation member  13  is a cylindrical member with two smaller ends and is sized to be insertable into the receiving hole  111  in the T-shaped connector  11 , with the other end of the insulation member  13  sized to be insertably retained in the exit  113  at one end of the receiving hole  111 , and lateral edge of the enlarged portion  131  of the insulation member  13  abutting against the wall edge of the exit  113  of the interior of the receiving hole  111 . The other end of the insulation member  13  is disposed to retain and surround the smaller-diameter portion of the insert ring member  12  that is inserted into the receiving hole  11  so that the insulation member  13  is insertedly retained in the receiving hole  111  of the T-shaped connector  11 . 
     With reference to FIGS. 3 and 4, when a connector  1  is to be assembled, the insulation member  13  is inserted into the receiving hole  111  in the middle portion of the T-shaped connector  11  such that one end of the insulation member  13  is retained in the exit  113  of the receiving hole  111 . The insert ring member  12  is inserted into the inner edge of the entrance  112  of the receiving hole  111  such that the smaller-diameter portion of the insert ring member  12  is retained and surrounded by the annular edge of the insulation member  13  at the entrance  112 , with the insert wall  121  at the middle portion of the insert ring member  12  abutting against the insert ring wall  114  at the entrance  112  at the inner edge of the interior of the receiving hole  111  to thereby retain the insulation member  13  in the receiving hole  111  of the T-shaped connector  11 . By means of the above-described structural elements, the connector  1  has the advantages of quick assembly and reduced costs. 
     It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above. 
     While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.