Resilient ballast underlayment mat including nonwoven fiber fleece layers

US4720043A · kind A · utility

Assignee

• Clouth Gummiwerke Aktiengesellschaft · DE

Inventor

• Hermann Ortwein · Bocholt, DE

Key dates

• Filing date: Feb 21, 1986
• Grant date: Jan 19, 1988
• Expiry date: Feb 21, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/679
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A road bed for railway rails comprises a ballast underlayment mat in the form of a body of elastomeric material. The mat has, at its bottom, prominent projecting parts of the elastomeric material and is covered by stone ballast. At least one fiber fleece layer on the top of the mat limits penetration of the stone ballast into the elastomeric material.