Folding and rigid ladder with extensions
US10246939B1 · kind B1 · utility
2Cited by
23References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2017 |
| Grant date | Apr 2, 2019 |
| Priority date | — |
| Expiry date | Apr 29, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C7/50
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An extension module is provided for attachment to a folding or rigid ladder to extend the effective working height of the ladder. A ladder that is designed for use with an extension module according to the invention defines the base module to which the extension module is attached. Cooperatively constructed interconnecting structures on the ladder and the extension module operate to secure the extension module to the ladder and to stabilize the combination of the ladder with the extension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.