Locking joint for collapsible ladders and other structures
US9222307B2 · kind B2 · utility
3Cited by
21References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2012 |
| Grant date | Dec 29, 2015 |
| Priority date | — |
| Expiry date | Sep 6, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C7/50
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A rigid structure such as a ladder is disclosed having rotating hinges that allow the ladder to fold up and/or be disassembled and assembled. The hinge or hinges can be provided between ladder sections with one ladder section having a male hinge element, and another having a female hinge element. A cam element provided with the female hinge element can be moved between an unlocked position in which the ladder sections can rotate with respect to each other, and a locked position in which the structure is rigid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.