Safety extension for a fixed ladder with an adjustable mount
US4546855A · kind A · utility
33Cited by
11References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 9, 1982 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | Aug 9, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C7/182
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A safety extension is adapted to be mounted by various adjustable means to the upper rungs of a ladder or the inside of a manhole. The safety extension comprises a rod which is moveable in a sleeve between extended and retracted positions. A counterbalance means mounted in a particular manner is optionally provided to facilitate moving the rod to the extended position with maximum ease and safety. Adjustable mounting means are provided to accommodate ladders of differing rung spacing and rung diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.