Monopole ladder
US5860490A · kind A · utility
Inventors
Key dates
| Filing date | Apr 17, 1997 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Apr 17, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C7/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An ascending and descending device, or ladder, having a single central mast and a hand and two foot supports axially slidably engaging the mast. Each hand and foot support has a spring biased clutch normally preventing axial motion of its associated support along the mast, and a lever for releasing the hand or foot support to move along the mast. The hand support has weight bearing platforms, or grips, projecting to both sides of the mast. Each foot support projects to one side of the mast. The foot supports are tethered together to limit the distance by which they become separated when lowering one foot support. The mast has at its bottom end a base having folding legs. The mast selectively receives at its top end a pronged support for engaging the roof of a building and a chair to enable a person to remain seated above the ground. The chair has a safety tie for securing the chair to a tree.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.