Tubular reducer fitting for electrical nonmetallic tubing

1. Apparatus for transitioning from an existing electrical nonmetallic tubing socket of one size to an electrical nonmetallic tubing socket of a smaller size, the existing socket having latch fingers for reception in an external circumferential groove of a first electrical nonmetallic tube that is closely receivable in the existing socket for locking reception therein, said apparatus comprising:

a reducer fitting having generally cylindrical male and female opposite end portions;

said male end portion having a cylindrical outer surface and a terminal end;

a shoulder extending outwardly from said outer surface between said male and female end portions;

a pair of axially-spaced first and second circumferential projections extending outwardly from said outer surface intermediate said terminal end and said shoulder;

said second projection being located between said first projection and said shoulder;

at least said second projection having a sloping cam surface that slopes outwardly from said outer surface in a direction away from said terminal end;

said female end portion having a generally cylindrical electrical nonmetallic tubing socket therein that is smaller than the existing socket for receiving an end portion of a second electrical nonmetallic tube that is smaller than the first electrical nonmetallic tube;

said male end portion being configured for locking reception in the existing electrical nonmetallic tubing socket by way of cooperation between at least one of said projections and the latch fingers on the existing socket; and

said electrical nonmetallic tubing socket on said fitting being one size smaller than the existing electrical nonmetallic tubing socket.

2. The fitting of claim 1 wherein said first projection has a sloping cam surface that slopes outwardly from said outer surface in a direction away from said terminal end and said first and second projections are spaced from one another by an outer cylindrical portion of said cylindrical outer surface on said male end portion.

3. The fitting of claim 1 wherein both of said projections have the same configuration and size.

4. The fitting of claim 1 wherein said electrical nonmetallic tubing socket on said fitting has a peripheral wall; resilient latch fingers projecting into said electrical nonmetallic tubing socket from said peripheral wall; and said latch fingers on said fitting having latch finger end portions receivable in an external circumferential groove of an electrical nonmetallic tube that is receivable in said electrical nonmetallic tubing socket on said fitting.

5. The fitting of claim 4 including an inwardly extending circumferential divider between said male and female end portions; said male end portion being configured for locking reception within a first size electrical nonmetallic tubing socket; and said electrical nonmetallic tubing socket in said female end portion being configured for locking reception of a second size electrical nonmetallic tube therein that is at least one size smaller than said first size.

6. The fitting of claim 1 wherein said male and female end portions have generally cylindrical inner surfaces and said inner surface of said male end portion has a smaller diameter than said inner surface of said female end portion.

7. Apparatus for transitioning from an existing electrical nonmetallic tubing socket to a smaller electrical nonmetallic tubing socket, said apparatus comprising:

a reducer fitting having generally cylindrical male and female opposite end portions;

said male end portion having a cylindrical outer surface and a terminal end;

a shoulder extending outwardly from said outer surface between said male and female end portions;

a pair of axially-spaced first and second circumferential projections extending outwardly from said outer surface of said male end portion intermediate said terminal end and said shoulder;

said second projection being located between said first projection and said shoulder;

at least said second projection having a sloping cam surface that slopes outwardly from said outer surface in a direction away from said terminal end;

said female end portion having a generally cylindrical electrical nonmetallic tubing socket with a peripheral wall;

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

an inwardly extending circumferential divider between said male and female end portions;

said male end portion being configured for locking reception within a first size electrical nonmetallic tubing socket; and

said electrical nonmetallic tubing socket in said female end portion being configured for locking reception of a second size electrical nonmetallic tube therein that is at least one size smaller than said first size.

8. The fitting of claim 7 wherein both of said circumferential projections on said outer surface of said male end portion have the same configuration and size.

9. Apparatus for transitioning from an existing nonmetallic tubing socket to a smaller electrical nonmetallic tubing socket, said apparatus comprising:

a reducer fitting having generally cylindrical male and female opposite end portions;

said male end portion having a cylindrical outer surface and a terminal end;

a shoulder extending outwardly from said outer surface between said male and female end portions;

a circumferential projection extending outwardly from said outer surface of said male end portion intermediate said terminal end and said shoulder;

said projection having a sloping cam surface that slopes outwardly from said outer surface in a direction away from said terminal end;

said female end portion having a generally cylindrical electrical nonmetallic tubing socket with a peripheral wall;

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

an inwardly extending circumferential divider between said male and female end portions;

said male end portion being configured for locking reception within a first size electrical nonmetallic tubing socket; and

said electrical nonmetallic tubing socket in said female end portion being configured for locking reception of a second size electrical nonmetallic tube therein that is at least one size smaller than said first size.

10. The fitting of claim 9 wherein said male and female end portions have generally cylindrical inner surfaces and said inner surface of said male end portion has a smaller diameter than said inner surface of said female end portion.

11. The fitting of claim 9 wherein said circumferential projection is located closer to said terminal end than to said shoulder.

12. The fitting of claim 9 wherein said divider has a radial surface aligned with said shoulder.

13. The fitting of claim 9 wherein said cam surface is inclined at 45° to said outer surface of said male end portion.

14. The fitting of claim 9 wherein said projection has a cylindrical projection outer surface and a radially extending surface that faces toward said shoulder.

15. The fitting of claim 14 wherein said projection outer surface is at least 0.025 inches wide.

16. The fitting of claim 9 wherein said projection extends at least 0.045 inches outwardly from said cylindrical outer surface of said male end portion.