Apparatus for forming and threading tubing
OwnerJerome H. Lemelsoninventor
Life of this patent
Estimating the term…
Abstract
An apparatus and method for continuously forming tubing by extrusion wherein selected positions of the length of the tubing are irregularly shaped with a formation such as a pipe or tube thread and wherein such forming occurs while the tubing is passing from the extrusion die. The apparatus also includes means for predeterminately cutting the extruding tube to lengths with each length containing a thread-like formation in its wall at either or both ends thereof. As a result the necessity of post operating on the extrusion in a secondary threading operation to form threads at its ends, is eliminated.
Claims10
An apparatus for forming and automatically threading tubing comprising:
- first means for extrusion forming a cylindrical tube to shape from an extrusion material,
- second means including a rotating tool supported adjacent said first means for intermittently engaging and disengaging a portion of the wall tube as it is formed and providing screw thread-like formations along selected lengths of the tube to the exclusion of the remaining portions of the extrusion wherein the tubing retains its extruded cylindrical shape along those portions of the extrusion which are not operated on by said second means and the threads so formed are shaped to retain similarly threaded fittings in fastening engagement therewith,
- third means supported downstream of said first and second means for operating on said extrusion to cut the extrusion to predetermined length, and
- fourth means for synchronizing the operation of said second and third means wherein each of the cut lengths of said extrusion contains at least one end thereof having said thread-like formations provided therein and shaped for retaining a fitting in threaded assembly on said end.
Dependencies are inferred from the claim text.