Method of forming bead apex rubber and forming device
US11014319B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 2017 |
| Grant date | May 25, 2021 |
| Priority date | — |
| Expiry date | May 21, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/246
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
To solve problems of complication and malfunction of the device's structure, an increase in the process time, and malfunction caused by catching of a front end portion of a bead apex rubber.A bead apex rubber forming method comprises a forming step P1, a connecting space opening step P2, a connecting space closing step P3, and a connecting step P4. In a rear closed state R of a molding chamber 11, the forming step P1 injects unvulcanized rubber G while a bead core A is being rotated, and forms a bead apex rubber B having a front end portion Bf. when the front end portion Bf approaches a rear shutter part 9, the connecting space opening step P2 removes a second lateral surface S2 together with the rear shutter part 9, and forms, between the front end portion Bf and a rear end portion Br, a connecting space J whose second side surface S2 side is opened. The connecting space closing step P3 closes the connecting space 3 by disposing a third lateral surface S3 extending between the rear end portion Br and the front end portion Bf. The connecting step P4 injects the unvulcanized rubber into the connecting space J closed, and connects between the rear end portion Br and the front end por…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.