Safety scaffold and platform ladders
US5862881A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 2, 1996 |
| Grant date | Jan 26, 1999 |
| Priority date | — |
| Expiry date | Dec 2, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04G2001/157
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Safety scaffold or platform foldable structures for ladders are disclosed. The scaffold structure embodies an elongated expandable scaffold floor section which is removably connected to two spaced apart upstanding ladders. Male and female floor sections are expanded to the desired length and locked in place by a locking pin. Spaced apart double hook hinges are releasably secured to one rung on each ladder. Wedge mechanisms work in conjunction with the hook hinges engaging the ladder rails to secure the scaffold structure in the horizontal open working position. The platform structure in the form of the letter H is removably connected to two adjacent rungs of a single ladder. The pair of hook arms hook around the upper rung and a pair of bottom arms support the structure on the lower rung. Descending wedge mechanisms engage the ladder rails in supporting the platform structure in the horizontal open working position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.