Bead filler construction
US5114512A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1990 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | May 1, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D2030/482
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In the manufacture of a pneumatic tire the approximately triangular space immediately radially inward of each bead of the tire is filled by an apex construction made by helically winding uncured rubber strip. The tapered configuration is achieved by winding from a position progressively closer to a support surface so that the windings become progressively more oblique. Width reduction of the rubber strip can be achieved by subjecting it to progresively greater tension during winding. The winding of the apex formation may be interrupted while an end of a carcass play is turned over the bead and incomplete apex. Turns of unsheathed wire may be wound over the carcass ply end and then winding of the uncured rubber strip continued until the apex formation is completed. In one modification (FIG. 5) the carcass ply is incorporated in a wound bead assembly. In another (FIG. 3) windings of a harder material such as Kevlar are interposed between windings of uncured rubber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.