Method and apparatus for forming internal threads in tubes
US4457153A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1982 |
| Grant date | Jul 3, 1984 |
| Priority date | — |
| Expiry date | Mar 29, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S470/901
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for forming internal threads on tubular components by a non-cutting process is disclosed. Various disclosed features find particular utility when using a thread forming or rolling tap process to form internal threads on sucker rod coupling tubes. In the preferred embodiment, a machine is disclosed utilizing a movable fixture head (34) capable of simultaneously threading one or more tubes (12, 12') of various sizes. A single hydraulic cylinder (59) moves the fixture head to various positions relative to the work stations (14, 16) to control several operational steps including the sequential feed of the tubes (12) to the work stations (14, 16), clamping/unclamping of the tubes during the tapping process, and retention of the tap (204) while the threaded tubes are removed from the work stations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.