Method of manufacturing box ladders
US5317798A · kind A · utility
9Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1992 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Mar 10, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49876
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of manufacturing box ladders having a pair of side rails and rungs wherein each of the side rails are assembled from a pair of section members having holes pre-formed prior to assembly of the side rail. The method provides reduced deformation in the manufacture of box ladders having cylindrical rungs and provides for the manufacture of box ladders having non-cylindrical shaped rungs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.