Abstract:
The invention is an electrical connector that has a forwardly removable coupling ring (30). The coupling ring (30) is characterized by annular members (31, 32) that are connected together by one or more removable fasteners (50, 51) and held in place in front of the housing flange (11) by a snap ring (40) located in a groove (12) in the housing (10).

Description:
This invention relates to an electrical connector and more particularly to a coupling ring for the connector. 
     An electrical connector assembly is generally comprised of two separate housings connected together by a coupling member mounted on one of the housings. In cylindrically shaped connectors there are bayonet type couplings, which include an internal groove that mates with a pin on a housing, and threaded couplings which include threads that mate with threads on a housing so that when the coupling member is rotated the housings are drawn together mating the contacts within the housing. Both types of coupling members are generally mounted behind an annular flange on one of the housings and held in place by a snap ring. Because of this arrangement when a problem arises with a coupling ring and it must be removed and replaced it is necessary to remove the wires and attached contacts within the connector assembly to remove the coupling ring. 
     Accordingly, removal and replacement of a coupling ring from a connector assembly is time consuming and undesirable because improper replacement of the contacts may easily occur. 
     DISCLOSURE OF THE INVENTION 
     This invention is an electrical connector that has a forwardly removable coupling ring. The coupling ring is characterized by two annular members that are connected together by one or more removable fasteners and held in place in front of the annular flange on the connector housing by a snap ring that is snapped into a groove in front of the housing. One of the coupling ring members includes a lever to facilitate rotation of the coupling ring. 
     Accordingly, it is an advantage of this invention to provide an electrical connector with a forwardly removable coupling ring. 
     It is another advantage of this invention to provide a coupling ring that may be removed from an electrical connector housing without the necessity of removing contacts and the wires attached to the contacts. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     FIGS. 1 and 2 illustrates a portion of a coupling ring for an electrical connector that forms a part of this invention. 
     FIG. 3 illustrates an electrical connector housing adapted to receive a coupling ring. 
     FIG. 4 is an enlarged view of a coupling ring and connector housing connected together. 
     FIG. 5 is an enlarged view of a portion of a coupling ring incorporating the principles of this invention. 
     FIG. 6 is a side view of an electrical connector assembly incorporating the principles of this invention. 
     FIG. 7 is a front view of the connector assembly shown at FIG. 6. 
    
    
     Referring now to the drawings, FIG. 1 illustrates a portion of a first annular member 31 that forms a portion of the coupling ring. The first annular member 31 has a plurality of detents 36 and a passage 33 adapted to receive a fastener for connecting together the first member 31 and second member 32 shown in FIG. 2. 
     FIG. 2 illustrates the second annular member 32 of the coupling ring. The second annular member 32 includes an annular groove 39 extending a predetermined distance on the inside thereof and adapted to receive a projection on another connector housing; a plurality of axial projections 35 adapted to mate with the detents 36 in the first member 31 shown in FIG. 1 to prevent relative movement between the first and second members when they are connected together; and a passage 34 adapted to receive a removably mounted fastener that connects the first and second members together. The forward surface of the groove 39 includes a shoulder 38. 
     FIG. 3 illustrates an electrical connector housing 100 adapted to mate with the second member 32 of the coupling ring. The housing includes an elongated projection 139 that mates with the groove 39 in the second member 32 of the coupling ring. The elongated projection 139 includes a shoulder 138 adapted to abut against the shoulder 38 shown in the groove 39 of the second member 32 in FIG. 2. When the projection 139 is aligned with the groove 39 in the second member 32 showin in FIG. 2 and the member 32 is rotated the housing 100 and member 32 are drawn together. 
     FIG. 4 shows the projection 139 after it has traveled through the groove 39 from the lower end up to the top portion where the shoulders 138, 38 abut against each other, holding the coupling ring 30 on the housing 100. 
     FIG. 5 illustrates how the coupling ring incorporating the principles of this invention is mounted forwardly of the annular shoulder 11 of a connector housing 10. The first annular member 31 is connected to the second annular member 32 by a nut 51 and a bolt 50, which is located through the passages 33, 34 in the first and second members 31 and 32. To assemble the coupling ring 30 on the housing 10 the first member 31 is located against the annular shoulder 11 of the housing 10. A snap ring 40 is then placed in groove 12 to retain the first member 31 between the snap ring 40 and the shoulder 11. The second annular member 32 is then placed against the first member 31 and bolt 50 is placed through the passages 33, 34 in the first and second members 31, 32 and into nut 51. When the bolt 50 is tightened the first and second members 31, 32 are removably retained together. 
     FIG. 6 shows an electrical connector assembly incorporating the principles of this invention. In this embodiment a housing 10 having the coupling nut 30 mounted thereon is mounted below a housing 100 adapted to receive a coupling nut. Both housings 10 and 100 include a plurality of electrical contacts 20, 120 that are mounted within the connector housings 10, 100 and attached to wires 25, 125. 
     FIG. 7 illustrates a front view of the connector assembly shown in FIG. 6. In this embodiment of the invention the first member 31 of the coupling ring 30 includes a lever 3 which is used to rotate the coupling ring. Projection 60 on the other housing 100 and projection 37 limits the movement of the lever 3 and prepositions the lever 3 for the initial mating with a complementary connector assembly. 
     While a preferred embodiment of the invention has been disclosed, it will be apparent to those skilled in the art that changes may be made to the invention as set forth in the appended claims and, in some instances, certain features of the invention may be used to advantage without corresponding use of other features. For instance, although only one bolt 50 is described as holding the first and second members 31, 32 together, more than one bolt may be used. Further, the passages 33 and 34 in the members 31 and 32 may be threaded so that the need for a nut 51 would be eliminated. Accordingly, it is intended that the illustrative and descriptive materials herein be used to limit the principles of the invention and not to limit the scope thereof.