Extrusion head

US4799874A · kind A · utility

Assignee

• Hermann Berstorff Maschinenbau GmbH · DE

Inventors

• Klaus Bellmer · Ronnenberg, DE
• Gerd Capelle · Langenhagen, DE

Key dates

• Filing date: Nov 5, 1987
• Grant date: Jan 24, 1989
• Expiry date: Nov 5, 2007

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29L2030/002
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An extrusion head suitable for producing tread strips for automotive vehicle tires from a plurality of rubber mixtures comprising a central head portion, upper and lower head portions disposed one on each side of said central head portion, said upper head portion and said central head portion and said lower head portion and said central head portion jointly defining at least two flow channels therebetween said flow channels being disposed above one another in a vertical plane, hydraulic means for pivoting each of said upper and lower head portions relative to said central head portion, said upper and lower head portions each including lateral portions extending substantially parallel to the direction of flow of said rubber mixtures through said head, hydraulically actuated locking means mounted on each said lateral portion and displaceable laterally outwardly in a direction substantially at right angles to said direction of flow, said locking means including locking members engageable with each said lateral portion and a locking arrangement for high-pressure locking of said upper and lower head portions disposed on each lateral side of said head for each of said upper and lower hea…