Lightweight, collapsible bridge module, and system with deployment and retrieval trailer
US4962556A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1989 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Mar 2, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01D15/127
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A modular lightweight bridge comprises a pair of tubular truss formed spans, each of which include a plurality of modules hinged to one another at locations on the bottom of the bridge for folding the bridge for transport prior to deployment of the bridge. Each span has a unique high strength fabric deck or roadway surface tensioned across the upper side of the truss chord members. The bridge is uniquely captively mounted on a trailer by rollers for transporting the bridge when it is in its folded mode. When the bridge is to be deployed, each span is unfolded by pivoting the modules with respect to one another about vertical axes so that the spans expand longitudinally with respect to the trailer. The spans are then pivoted 90.degree. downwardly about longitudinally extending horizontal axes and the bridge rolled rearwardly from the trailer over the gap to be spanned. Due to the unique captive roller interconnection between the bridge assembly and its transport-deployment trailer, the trailer can thereafter be stored beneath the deployed bridge hanging down into the gully or gap. When a decision is made to remove the bridge, the trailer can be towed from either side back over the b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.