Abstract:
An improved connector for coupling with a signal connector for signal transmission has a movable shield sleeve to cover the naked lead of the power signal line for preventing the connector from short circuit or causing harmful incidents to people. It also provides a stronger connection and enhances safety.

Description:
FIELD OF THE INVENTION 
     This invention relates to an improved connector electrical devices which transmit power driven signals, one that has a shield structure to prevent metallic leads from outside exposure and enhances connection strength. 
     BACKGROUND OF THE INVENTION 
     Conventional electrical devices usually have a connector for transmitting power driven signal with an external signal line. The connector usually includes a male and a female connector to make connection simple. FIG. 1 illustrates a typical conventional connector now being widely used. It has a conductive male connector  1  and a female connector  2 . The female connector  2  includes a fastener  22  which has a bore  21  formed therein. Inside the bore  21 , there is a metallic barrel fastener  23  which connects to a conductive wire  24 . The male connector  1  may be plugged into the bore  21  to connect with the barrel fastener  23  for transmitting a signal through the wire  24 . 
     The conductive male connector  1  is naked and exposed to ambient environment. It is prone to produce short circuit when not being properly used. It may also be disconnected easily from the female connector  2  and may result in harmful accident to children when not being properly guarded. 
     With increasing number of electric devices and gadgets targeting children market nowadays, it becomes a pressing need to design a safer connector to lower the potential risk to users, particularly to children. 
     SUMMARY OF THE INVENTION 
     It is an object of this invention to provide an improved connector for power signal transmission use in electrical devices and to offer a higher adaptability and safety level to meet stricter safety specifications and requirements of future products. 
     The connector according to this invention has a shield around a naked male connector for engaging with a female connector so that short circuit accidents may be greatly reduced. 
     In one aspect of this invention, the shield sleeve structure includes a latching means for anchoring on the male connector and for freeing the male connector to move and engage with the female connector when in use. 
     In another aspect of this invention the male connector has a groove formed in a side wall to hold a resilient member therein. The shield sleeve has a stub extending in the groove and is movable by the resilient member in the groove. Hence the naked male connector may be protected by the shield sleeve from outside exposure all the time. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention, as well as its many advantages, may be further understood by the following detailed description and drawings in which: 
     FIG. 1 is a perspective view of a conventional connector. 
     FIG. 2 is a sectional view of a first embodiment of this invention. 
     FIG. 3 is a perspective view of the first embodiment of this invention. 
     FIG. 4 is a sectional view of a second embodiment of this invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to FIGS. 2 and 3, the connector  100  of this invention includes a connector head  170  which has a signal line embedded inside. The signal line lead  130  extends outside the connector head  170 . Adjacent one end of the connector head  170 , there is a first groove  123  in which a first resilient member  122  is held. Above the first resilient member  122 , a button  121  is provided. The connector head  170  is housed in a shield sleeve  110  which has a second groove  124  mating against the first groove  123 . When the button  121  is held in the first and second grooves  123  and  124  (as shown in FIG.  2 ), the lead  130  is completely held in a connection cavity  190  formed inside the shield sleeve  110  beyond one end of the connector head  170 . 
     The signal connector  200  is generally constructed like a conventional female connector which includes a connector body  210  having a bore  220  formed inside connecting with a signal line  230 . The connector body  210  is engageable with the connection cavity  190 . 
     In use, when the lead  130  is inserted into the bore  220 , the connector body  210  will be housed in the connection cavity  190  to form a tight and shielded connection guarded by the shield sleeve  110 . It becomes a sturdy and highly safe connection. The button  121  will keep the shield sleeve  110  stationary against the connector head  170  when the connector body  210  engages or disengages with the connection cavity  190 . Even when disengaged, the shield sleeve  110  completely covers the lead  130 . Hence the risks and hazards of an exposed naked connector that happens in a conventional connector may be avoided. The connector head  170  may further have a third groove  180  formed in a side wall. The shield sleeve  110  has a stub  181  extending into the third groove  180 . There is a second resilient member  182  held in the groove  180  with one end thereof pushing the stub  181 . By means of such structure, the shield sleeve  110  will be pushed forward beyond the connector head  170  such that the connection cavity  190  covers the head  130  all the time to further improve the safety. 
     FIG. 4 shows a second embodiment of this invention. It has a connector  100  which is constructed like the one shown in FIG.  2 . The signal connector  400  has a larger size than the connection cavity  190  and includes a guard rim  420  at one end which forms a cavity  410  inside large enough to hold one end of the connector head  170 . There is also a connector body  210 , a bore  220  and signal line  230  as shown in FIG.  2 . 
     When in use, pressing the button  121  downward into the first groove  123  enables the connector head  170  to be movable axially inside the shield sleeve  110  so that one end of the connector head  170  may be pushed and inserted into the cavity  410  for plugging the head  130  into the bore  220 . 
     When disconnected, the second resilient member  182  pushes the shield sleeve  110  so that the connector head  170  is pulled back from the cavity  410  to have the button  121  engaged with the second groove  124  again. The head  130  will then be covered by the shield sleeve  110  to avoid incident. 
     It may thus be seen that the objects of the present invention set forth herein, as well as those made apparent from the foregoing description, are efficiently attained. While the preferred embodiments of the invention have been set forth for purpose of disclosure, modifications of the disclosed embodiment of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.