Tube plug
US4390042A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1980 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Jul 30, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/4994
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
The tube plug comprises a shell having a tapered inner surface against which an externally tapered expander member moves by application of a pulling force. The motion of the expander member relative to the shell causes the shell to expand into contact with a heat exchange tube thereby plugging the tube. The expander member is formed from a hardened metal with tangentially blended leading radius and a self-locking trailing edge which provides for ease in expanding the shell while preventing inadvertent unlocking of the plug. The shell has a substantially uniform wall thickness throughout the portion of the shell which experiences expansion so that the force necessary to perform the expanding process does not increase beyond the strength limitations of the installation equipment as the expander member is moved through the shell. The shell also has a plurality of lands on the outside surface thereof whose depth increases from closed end to open end of the shell so that a uniform wall thickness can be maintained in that region while allowing the lands to contact the inner surface of the heat exchange tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.