Positioning joint for folding ladders
US4770559A · kind A · utility
54Cited by
3References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1987 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Oct 13, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/598
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A positioning joint for a folding ladder comprising a first joint member having a locking device, and a second joint member having a relatively fitted guide-disc plate. The two joint members are relatively pivotable about a common axis and are lockable in a series of predetermined angular positions by engaging the locking device provided on the first joint member in notches formed at the peripheral edge of the other member, under the control of the guide-disc plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.