Trench box safety ladder
US7530767B2 · kind B2 · utility
2Cited by
25References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 3, 2007 |
| Grant date | May 12, 2009 |
| Priority date | — |
| Expiry date | Sep 5, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D17/086
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Various embodiments of the present invention relate to trench box safety ladders and methods of constructing trench boxes with safety ladders. In one embodiment, a trench box comprises two side walls with a plurality of supports between the two walls, a built-in ladder within the inner face of a side wall, and an extension ladder positioned on the top face of the side wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.