Hollow plastic ladder
US5366051A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1992 |
| Grant date | Nov 22, 1994 |
| Priority date | — |
| Expiry date | Apr 29, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C7/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention pertains to a ladder. The ladder includes a first plastic side rail, at least a portion of which is hollow. The ladder also includes a second plastic side rail, at least a portion of which is hollow. The second side rail is in parallel with the first side rail. Additionally, the ladder includes a plurality of steps, each of which is attached to the first and second side rails at predetermined locations such that each step forms a flat weight bearing platform upon which a user can stand. The first and second side rails each have a plurality of pockets having solid cross sections disposed therealong at predetermined positions, and each of the steps are attached to the first and second side rails at corresponding pockets therein with fasteners through holes in the solid cross sections. The present invention also pertains to a stepladder. The stepladder includes a first side rail. The stepladder also includes a second side rail adjacent to and in parallel with the first side rail. There are a plurality of steps, each of which is attached to the first and second side rails at predetermined locations such that each step forms a flat weight bearing platform upon whic…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.