Light weight ladder systems and methods
US6866117B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 2002 |
| Grant date | Mar 15, 2005 |
| Priority date | — |
| Expiry date | Jun 15, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C7/085
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for manufacturing a rail for a ladder. The method may include pultruding in a longitudinal direction, a rail having a selected cross-sectional shape. The rail may then be cut to a predetermined length at a distal end. A force may be applied, in a lateral direction, to the rail to form a curvature therein. The curvature may be characterized by a flared portion, a straight portion, and a curved region providing the transition therebetween. The rail may be held at the desired curvature for a time selected for the rail to take on the curvature substantially permanently. The force may then be removed and the rail may be assembled into a ladder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.