Welding sleeve of thermoplastic material
US4313053A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 2, 1980 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Jan 2, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C65/3468
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A sleeve member (4) formed from a pipe length by expansion is placed over a mandrel onto which are wound the spaced turns (7) of a resistance heating wire (6). By heating sleeve member (4) the latter is shrunk onto the turns (7). By electrically producing heat in wire (6) material flows around the expanding turns (7) and embed the latter completely in sleeve member (4), projecting material portions (8, 9) being formed in the vicinity of turns (7). Thus, a protection against electric shock hazard is obtained for turns (7) and after-working is made unnecessary for the standing back edge portions of inner wall (5) which deform inwards during manufacture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.