Portal ladder
US9500027B2 · kind B2 · utility
4Cited by
8References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2014 |
| Grant date | Nov 22, 2016 |
| Priority date | — |
| Expiry date | Aug 28, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C7/50
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A foldable ladder has multiple ladder segments that fold and unfold relative to each other. Each ladder segment includes one rung element and multiple side rail sections that unfold for deployment to form box-shaped side rails of the ladder. Adjacent ladder segments are connected to each other by hinge joints. The ladder includes locking features at the hinge joints for preventing relative pivoting movement of adjacent ladder segments by more than about 180 degrees.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.