Method and apparatus for producing a flat spiral link assembly

US4750253A · kind A · utility

Assignee

• Hermann Wangner GmbH & Co. KG · DE

Inventors

• Fritz Bleher · Reutlingen, DE
• Klaus Esser · Hösbach, DE
• Hans-Eugen Hacker · Reutlingen, DE
• Rudi Hess-Bauer · Reutlingen, DE
• Eugen Kehrer · Tübingen, DE
• Hartmut Waldvogel · Heidenheim, DE

Key dates

• Filing date: Dec 22, 1986
• Grant date: Jun 14, 1988
• Expiry date: Dec 22, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/53696
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

The method produces a flat spiral link assembly from at least four synthetic resin monofilament helices wound winding to winding which are simultaneously supplied for meshing engagement. Before being meshed the helices are stretched to at least three times their length and are thermoset in stretched condition. The alternatingly right-hand and left-hand helices are caused to mesh in zipper fashion and are interlocked by pintle wires. In order to facilitate the insertion of the pintle wires the helices are extended by about five percent. The apparatus for performing the method comprises two feed rolls forming a first roll nip through which helices are passed to a heating chamber. Draw-off rolls withdraw the helices from the heating chamber at least at three times the peripheral speed of the feed rolls. The apparatus also comprises a shunt for joining the helices and a device for inserting the pintle wires.