Elastic mat for a ballast bed underlayment
US4696429A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 1985 |
| Grant date | Sep 29, 1987 |
| Priority date | — |
| Expiry date | Jul 11, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01B2204/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mat comprising an elastic material which serves as an underlay for a ballast bed of crushed stone, metallic particles, or the like is provided with a plurality of projections on its underside and with an upper layer of a material different from the elastic material. This upper layer on the upper side of the mat advantageously comprises a strong fabric. Particularly the upper layer may comprise a multilayered fabric with inlay layers of elastic material positioned between the individual layers of the multilayer fabric as well as a coverying layer of a softer material on the upper surface of the upper layer of the mat. The fabric of the upper layer of the mat advantageously comprises a water and rot resistant plastic material, such as a polyamide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.