Sleeve applicator assembly for pipe joints
US4961798A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1989 |
| Grant date | Oct 9, 1990 |
| Priority date | — |
| Expiry date | Oct 2, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2035/0811
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A system for first heating a section of pipe and then wrapping a sheet of heat-shrinkable material around the pipe to cover the section, the heat-shrinkable material having an outer polyethylene side and an inner mastic side which goes against the pipe, the mastic side forming a mechanical bond to the pipe when heated and having a lower melt temperature than the shrink temperature of the material, comprising arranging a plurality of induction coil assemblies in spaced relation around the pipe section, the induction coil assemblies having relatively arcuate induction coils therein, mounting the coils on a rotation fixture to form an arcuate surface adjacent to and parallel with the surface of the pipe, locating a heater assembly on the rotatable fixture between a pair of induction coil assemblies, rotating the rotatable fixture around the pipe section to heat the pipe section to the melt temperature of the mastic, wrapping a sheet of heat-shrinkable material around the pipe to form a sleeve with overlapping ends, placing a closure patch having a lower mastic surface over the overlapping ends of the sleeve, activating the heater assembly to bond the closure patch to the overlapping e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.