Two-position ladder
US4846303A · kind A · utility
16Cited by
1References
3Claims
0Family size
Inventors
Key dates
| Filing date | Nov 21, 1988 |
| Grant date | Jul 11, 1989 |
| Priority date | — |
| Expiry date | Nov 21, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63B27/14
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pipe track has a groove in which a ladder is slidably mounted for movement between ends of the track. A pair of spaced, downwardly extending notches at one end of the groove permit the ladder to be pivoted downwardly to occupy a vertical position coplanar with the track; and a pair of spaced, upwardly extending notches at the other end of the groove permit the ladder to be pivoted upwardly to occupy a vertical position coplanar with the track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.