Welding collar
US5990462A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1998 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Nov 30, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C65/3468
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A welding collar contains a collar body of fusible plastic and a heater coil, disposed in its inside surface, which is spaced apart from a free collar end by a front zone. This welding collar is improved in that pipelines with ends which are not precisely cylindrical, and especially pipelines made from material in rolls, can be welded in a problem-free and reliable manner. The sum of the length of the front zone and the axial length of an inner zone adjoining the heater coil, with which the inserted pipe comes in contact, is at least approximately equal to the length of the heater coil. The insertion depth is greater by at least a factor of 1.4 than the inside diameter of the collar body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.