Abstract:
A weathertight connector for electrical connectors having multiple connection chambers with a conductive element having splaying ends in the connection chambers. One common O-ring and an O-ring for each connection chamber is utilized.

Description:
REFERENCE TO RELATED APPLICATION 
     The present application is the subject of provisional application Ser. No. 60/327,301 filed Oct. 9, 2001 and entitled WEATHERTIGHT CONNECTOR. 
    
    
     BACKGROUND AND BRIEF DESCRIPTION OF THE INVENTION 
     The present invention is directed to a weathertight electrical connector using the positive wire-locking features of U.S. Pat. Nos. 5,228,875, 5,695,369 and 5,868,589 which features are adapted in a unique manner to achieve a weathertight connector. 
     The electrical connecting of two discrete wires using the positive wire locking features of the above-referenced U.S. patents has been highly successful commercially and sold under the trademark POSI-LOCK by the assignee hereof. In the electrical connectors of the type disclosed in the above-identified patents as well as others, a connection chamber is formed in an non-conductive body and a conductive metal insert is provided which extends between the two connection chambers. The ends of the conductive element in the connection chambers is shaped as a splaying member for splaying a wire on its surface. The interior surface of the connection chamber is threaded for receiving a threaded male member which has a throughbore, and a portion of the throughbore is shaped to form a complementary surface to the bullet-shaped splaying surface. When a wire is passed through the throughbore and engages the splaying surface, it is splayed along the splaying surface and then a male member having a threaded exterior engaged with threaded connection chamber walls to clamp the wire between the shaped splaying surface and the complementary clamping surface formed on the throughbore male member. It is desirable in a number of situations to provide a weathertight seal for the connection chambers. 
     The object of the present invention is to provide techniques and structures for forming a weathertight connector in which the connection chambers are sealed from the egress of moisture and the like. 
     In a preferred embodiment of the invention, a movable discrete clamp member is provided with a throughbore having a complementary surface on it for clamping the wire to the surface of the conductive insert. For each connection chamber, there is a clamp member, and each clamp member has a throughbore, one end of which has the aforesaid clamping surface, the opposite end of which has a recess for receiving an O-ring. The O-ring in this instance is in the end of the non-conductive clamp member, which is adapted to fit inside the connection chamber having the internal aperture size designed to closely and snugly fit on the insulation of the wire inserted therein. The external surface of the connection chamber is threaded, and a force member which, in the preferred embodiment, is threadably engaged with the external threads on the body member engages the clamping member to force the clamping member against the wire splayed on the splaying member to thereby clamp the wire between the splaying surface, and the complementary surface in the throughbore. A second O-ring is adapted to be seated in an annular groove located approximate to mid-point between the two connection chambers. Thus, when the two force members are threadably engaged with the external threads on the body member and caused to move inwardly to clamp the wire between the two clamping surfaces on the conductive member, the ends of the force member engage the O-ring to thereby provide a seal for the connection chamber from external ambient environment. 
     Thus, the invention features a weathertight connector comprising a non-conductive body member having one or more connection chambers formed therein and a conductive element having a pair of ends, each end being positioned coaxially in one of the connection chambers, respectively, and being shaped to form a crimp-free wire connection, the outer surfaces of the non-conductive body member being threaded at each end. A non-conductive clamp member is adapted to be fitted inside the connection chambers, there being one non-conductive clamp member for each chamber. Each non-conductive clamp has an internal surface adapted to coact with the operative member for clamping the wire to the shaped end of the conductive element in the connection chamber. First O-rings are adapted to be seated in each clamping member, respectively, and has an internal aperture size designed to closely and snugly fit on the insulation of a wire inserted therein. A second O-ring member is seated in an annular groove formed in the external surface of the body member and proximate mid-way between the connection chambers. A force member is adapted to be threadably engaged with the external threads on the body member and engage the non-conductive clamp member to force the clamping member against the wires and thereby clamp the wire therein. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above and other objects, advantages and features of the invention will become more apparent when considered with the following specification and accompanying drawings wherein: 
     FIG. 1 is an isometric perspective view of a weathertight connector incorporating the invention, 
     FIG. 2 is an exploded view thereof, and 
     FIG. 3 is a cross-sectional view thereof showing a pair of wires electrically connected in a weathertight situation. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The invention features a non-conductive body member  10  having an annular groove  11  on which is seated an O-ring member  12 . The external ends  13  and  14  are threaded and have connection chambers  15  and  16  formed therein. Non-conductive clamp members  17  and  18  are adapted to be fitted inside the connection chambers  15  and  16 , respectively; and in the embodiment shown includes a throughbore  19  and  20 , the throughbore being adapted at one end to have a complementary internal surface S adapted to coact with the splaying member of a conductive element CE (see FIG. 3) having splaying ends  21 ,  22 . The opposite ends  23 ,  24  of the clamp member carry O-rings  25 ,  26  which are adapted to be seated in the clamping member ends  23 ,  24  and have an internal aperture size designed to closely and snugly fit on the insulation I of the wire inserted therein (see FIG.  3 ). Force members  29  and  30  have an internally threaded portion  31 ,  32  which are adapted to engage the threads of the external end  13  and  14 , respectively, of the non-conductive body member  10 . When the force members are turned (they have grooved surfaces for good gripping) to tighten them on the non-conductive body member  10 , clamp members  17  and  18  are engaged by the respective force members  29  and  30 , and the clamping member is forced against the wire splayed on the splaying member to thereby clamp the wire between the splaying surfaces  21 ,  22  and the complementary internal surface S on the force member. At the same time, the ends  41 ,  42  of the force members engage the central O-ring  12 , thereby forming a weathertight arrangement for each of the connection chambers. 
     As shown in FIG. 3, the force members  29  and  30  are threadably engaged with the threads of the external end  13  and  14  of the body member  10 . At the same time, the force member is bearing down on the O-ring in the ends of clamp members  17  and  18  which, due to the shape of the O-ring chamber, causes the O-ring to close in the grip wire. Thus, two forces are acting on the wire, one the conductive wire strands are gripped tightly between the clamping surface of the splaying ends of the conductive element and the O-ring is gripping the external surfaces of the wire insulation. 
     Instead of a splaying member, the ends of the conductive element in the connection chambers can be shaped to have a wire bore for receiving a wire and a transversely moved ball clamp element seated in a transverse aperture can be forced by the respective clamp members into clamping engagement with the wire in the wire bore by the nonconductive clamp member. 
     While preferred embodiments of the invention have been shown and described, it will be appreciated that many other embodiments, adaptations, changes and modifications to the invention can be done by those skilled in the art.