Method of forming tire bead assembly
US5350470A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1993 |
| Grant date | Sep 27, 1994 |
| Priority date | — |
| Expiry date | Nov 30, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D2030/482
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of forming a bead assembly for use in a pneumatic tire includes extruding a strip of green elastomeric material onto a split or pair of steel supporting guide ring where the ends of the extruded strip are cut at a bias angle and then spliced together to form an annular elastomeric member. The extruded strip and formed annular member has a pair of tapered longitudinal end members joined by a central recess. An annular tire bead is placed in radial alignment about the central recess of the annular member. Next, a segmented mandrel carrying inflatable turnup bladders is expanded outwardly, afterwhich the split guide ring is axially withdrawn. The mandrel and bladders then provide the support for the elastomeric member previously provided by the split annular ring, and traps the bead within the central recess. The two longitudinal end members of the extruded strip are then turned up about the bead by inflating the bladders to form the bead assembly, afterwhich the assembly is placed in a shaping mold. If desired, an annular strip of reinforcing material may be placed concentrically about the bead before the end members are turned up about the bead, to provide internal reinforc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.