Method of manufacturing railway sleepers
US4285115A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1979 |
| Grant date | Aug 25, 1981 |
| Priority date | — |
| Expiry date | Jun 1, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49893
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A multiplicity of step-shaped sleepers or ties each having two straight end segments interconnected by a middle portion inclined at obtuse angles with respect to the end segments are each joined at their respective end segments to two adjacent sleepers by means of rib plates to form a zig-zag sleeper network underlying a pair of parallel spaced-apart rails in a railway roadbed assembly. The sleepers are formed from I-beam profiles; a plurality of channel profiles extending parallel to the rails below the sleeper network are connected to the rib plates by bolts traversing the sleepers, the channels being embedded in the ground or in a concrete track bed to prevent lateral displacement of the railway assembly. A method of forming Y-shaped ties includes the bending of I-beam profiles in a press die assembly, welding the profiles together and filling interbeam spaces with a weight-increasing corrosion-retarding material such as concrete.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.