Bead apex rubber-forming method, and bead apex rubber-forming device
US10864694B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 14, 2018 |
| Grant date | Dec 15, 2020 |
| Priority date | — |
| Expiry date | Feb 14, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/246
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention forms bead apex rubber with good precision on the outer circumferential surface of the bead core. A molding process, in which unvulcanized rubber is made to flow into a bead apex molding chamber that is surrounded by surfaces that include the outer circumferential surface of a circular bead core and the bead apex rubber is formed directly on the outer circumferential surface of the bead core that is rotating around the core axis, is provided. The molding process comprises: a tip forming step that forms the leading end of the bead apex rubber; a middle section forming step that sequentially forms the bead apex rubber to be continuous with the leading end; and a joining step to join the back end and the leading end of the bead apex rubber by inflowing the unvulcanized rubber therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.