Adjustable ladder extender assembly safety attachment
US4284172A · kind A · utility
Inventor
Key dates
| Filing date | Jul 6, 1979 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Jul 6, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/32262
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A ALEASA for ladders is comprised of three pieces which when attached to one side of a ladder near its base and adjusted will have the effect of lengthening that side to keep the ladder vertical while resting on an angled plane; or when an ALEASA is attached to each side of a ladder near its top and are adjusted, they will have the effect of extending the ladder to rest against a wall while allowing the top of both sides of the ladder to be free of any contact with the wall; or when an ALEASA is attached to a ladder near its top, and adjusted, it will have the effect of extending that side of the ladder to rest against an angled or different wall while keeping the two sides of the ladder parallel with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.