Claims
- 1. A pipe fitting comprising:
(a) a body having a bore terminating in a bore opening, the bore opening being threaded with a plurality of internal tapered bore threads of a first material, the tapered bore threads having successively smaller threaded bore thread pitch diameters and include a first tapered bore thread which is disposed closest to the bore opening and which has a pitch diameter which is larger than that of the other tapered bore threads; and (b) at least one starter thread disposed either within the bore and being closer to the bore opening than the tapered bore threads or being disposed immediately outside of the bore, the at least one starter thread being axially aligned with the tapered bore threads and being of a second material which is stronger than the first material, the at least one starter thread including a last tapered starter thread disposed closest to the tapered bore threads; wherein the last tapered starter thread has a pitch diameter which is at least 2% greater than the pitch diameter of the first tapered bore thread.
- 2. A pipe fitting comprising:
(a) a body having a bore terminating in a bore opening, the bore opening being threaded with a plurality of internal tapered bore threads of a first material, the tapered bore threads having successively smaller threaded bore thread pitch diameters and include a first tapered bore thread which is disposed closest to the bore opening and which has a pitch diameter which is larger than that of the other tapered bore threads; and (b) a plurality of tapered starter threads disposed either within the bore and being closer to the bore opening than the tapered bore threads or being disposed immediately outside of the bore, the tapered starter threads being axially aligned with the tapered bore threads and being of a second material which is stronger than the first material, the tapered starter threads having successively smaller tapered starter thread pitch diameters and including a last tapered starter thread disposed closest to the tapered bore threads and which has a pitch diameter which is smaller than that of the other tapered starter threads; wherein the last tapered starter thread has a pitch diameter which is at least 2% greater than the pitch diameter of the first tapered bore thread.
- 3. The pipe fitting of claim 2 wherein the threaded starter threads comprise a first group of contiguous threaded starter threads and a second group of contiguous threaded starter threads, the second group of contiguous threaded starter threads including the last threaded starter thread, and wherein the threaded bore threads and the first group of contiguous threaded starter threads are tapered at a first angle and the second group of contiguous threaded starter threads are tapered at a second angle which is greater than the first angle.
RELATED APPLICATIONS
[0001] This application is a continuation-in-part of U.S. patent application Ser. No. 10/189,702, filed Jul. 3, 2002, entitled Pipe Fitting Having Strengthened Starter Threads, the entirety of which is incorporated herein by this references.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
10189702 |
Jul 2002 |
US |
Child |
10826844 |
Apr 2004 |
US |