Transition adapter for electrical conduit

1 . A transition adapter for attachment to a surface of a concrete form and burial in concrete that is poured against the form surface to which the adapter is attached:

said adapter being molded in one-piece of plastic material for connecting together an electrical nonmetallic tube and an externally threaded end portion of a pipe;

said adapter having an electrical nonmetallic tube connector on one end portion thereof and a threaded connector on an opposite end portion thereof;

said electrical nonmetallic tube connector having a peripheral wall and a generally cylindrical electrical nonmetallic tube socket that terminates in an electrical nonmetallic tube socket end;

resilient latch fingers projecting into said electrical nonmetallic tube socket from said peripheral wall and having inwardly extending latch finger end portions receivable in an external circumferential groove of an electrical nonmetallic tube that is receivable in said electrical nonmetallic tube socket;

said electrical nonmetallic tube socket peripheral wall having openings therethrough around said latch fingers;

said latch fingers extending generally longitudinally of said electrical nonmetallic tube socket for bending movement generally radially of said electrical nonmetallic tube socket;

said latch fingers projecting from said peripheral wall adjacent said electrical nonmetallic tube socket end and said latch finger end portions being spaced along said latch fingers in a direction away from said electrical nonmetallic tube socket end;

said threaded connector having a threaded socket for threadably receiving an end portion of a pipe having an external thread thereon;

said threaded connector end portion terminating in an outwardly extending mounting flange having a generally flat bottom surface that forms the opposite end of said adapter that is opposite from said electrical nonmetallic tube socket end and is positionable against a generally flat surface of the concrete form for supporting the adapter thereon while concrete is poured against the form surface and buries the adapter; and,

said flange having fastener receiving openings therein for receiving fasteners that extend into the concrete form and secure the flange against the form surface.

2 . The adapter of claim 1 wherein said electrical nonmetallic tube connector and said threaded connector are coaxial.

3 . The adapter of claim 1 wherein said electrical nonmetallic tube connector and said threaded connector are at opposite end portions of a 90° elbow.

4 . The adapter of claim 3 including a curved tubular portion extending between said electrical nonmetallic tube and threaded connectors, and a reinforcing web extending between said mounting flange and said curved tubular portion.

5 . The adapter of claim 1 wherein said electrical nonmetallic tube socket is configured for receiving one-half inch, three-quarter inch or one inch trade size electrical nonmetallic tube, and said threaded socket is configured for receiving an externally threaded end portion on a one-half inch, three-quarter inch or one inch trade size pipe.

6 . The adapter of claim 1 wherein said adapter is a 90° elbow and said latch fingers are located on opposite sides of a plane that longitudinally bisects said adapter.

7 . The adapter of claim 1 including an inwardly extending circumferential divider between said electrical nonmetallic tube socket and said threaded socket, said divider providing a stop for abutment by an end of an electrical nonmetallic tube that is received in said electrical nonmetallic tube socket.

8 . The adapter of claim 1 wherein said peripheral wall of said electrical nonmetallic tube socket has generally opposite outwardly bulging latch finger supports and said latch fingers project from said latch finger supports along pivot points that are spaced outwardly from the outer surface of an electrical nonmetallic tube that is received in said electrical nonmetallic tube socket.