Apparatus for manufacturing lengths of rubber hose of curved shape

US4118162A · kind A · utility

Assignee

• Paul Troester Maschinenfabrik · DE

Inventor

• Wilfried Baumgarten · Pattensen, DE

Key dates

• Filing date: Oct 6, 1976
• Grant date: Oct 3, 1978
• Expiry date: Oct 6, 1996

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29L2031/243
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Apparatus for manufacturing lengths of rubber hose of curved shape comprises means for feeding a sequence of flexible mandrels in end-to-end relation to and through a first extruder which extrudes a continuous rubber hose onto the string of mandrels. Downstream of the extruder there is means for wrapping reinforcing thread around the hose and a second extruder for extending a second layer of rubber onto the reinforced hose. Downstream of the second extruder the hose is cut at locations between successive mandrels to form separate lengths of hose each with a flexible mandrel therein. Clamping means engages opposite ends of each mandrel with a hose length thereon and forces the ends toward one another to bend the mandrel and hose to curved form. While thus held in curved form, the hose lengths are vulcanized. The mandrels are then removed while evacuating the interior of the mandrel to contract it and forcing pressure fluid between the mandrel and the curved hose length to facilitate the removal.