Injection molded cold-expansion compression collar
US12290969B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 8, 2023 |
| Grant date | May 6, 2025 |
| Priority date | — |
| Expiry date | Mar 8, 2043 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2023/0691
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A compression collar is manufactured for use in reinforcing an interference fit between an end of a pipe and a fitting. A precursor form is injection molded using a cold-expansion material. The precursor form has a tubular body with an initially closed axial end and a bore that is initially blind formed in the other axial end. Material is removed from the initially closed axial end of the tubular body of the precursor form to form an opening in the initially closed axial end that connects to the bore thereby forming the compression collar. The opening has an inner periphery with a profile in axial cross section that is different than any profile in axial cross section of an inner periphery of the bore. The collar formed may lack knitlines and may include tabs formed during the removal step which help to position the collar on a pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.