Extrusion head for producing flat profiles from rubber or plastics material
US4653994A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 1986 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | May 28, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2030/002
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An extrusion head is provided for extruding flat profiles for producing tread strip portions of vehicle tires from mixtures of rubber or plastics materials, which permits one of the constituents such as the tread strip mixture to be changed without adversely affecting the other constituent parts of the mixture, such as the lateral rubber strip mixtures and the base rubber layer. This is achieved by suitably deflecting the flow channels for the lateral rubber layers in a front template. The flow channel for the lateral strips enters the template below the flow channel for the tread strip but discharges alongside the lateral edges of the tread strip. The head comprises a fixed central portion and pivotable upper and lower portions, the flow channels for the constituents of the mixture being defined by channels formed in insert members located between the head portions. By so doing, the flow channels for the base layer and for the lateral strips can be formed in one of the insert members leaving only the flow channel for the tread strip to be formed in the other insert member. Since it is the tread strip mixture which is most frequently changed, this can now be effected without advers…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.