Positioning system for folding ladder and method of installation of folding ladder using positioning system
US7165649B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2003 |
| Grant date | Jan 23, 2007 |
| Priority date | — |
| Expiry date | Dec 28, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04F11/064
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A support frame for a folding ladder, a folding ladder positioning system, and a method for installing a folding ladder, are disclosed and pertain to folding ladders disposable within an opening, such as openings in a ceiling of a house, to provide temporary access between one floor or space and another floor or space. In one aspect, a support frame includes a plurality of separable support frame plates collectively configured to circumscribe the opening and a plurality of connection sites are disposed at opposing ends of each of the plurality of separable support frame plates to facilitate connection of each support frame plate to adjacent support frame plates. The connection sites include, for example, mating locking connectors or a plurality of matching through-holes, which permit insertion of a fastening means therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.