Methods of manufacturing curved staircases and staircases produced
US5347774A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 1992 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | Nov 16, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04F11/108
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Improved methods of fabricating at least partially curved staircases include a first method in which preformed step structures have treads with curved slots formed in the underside of the ends which define a path for insertion of top edge segments of thin starter strips. The slots are collectively configured to laterally deflect the inserted starter strips in a manner longitudinally conforming them to at least partially curved paths of the overall stringer structures in the completed staircase. The stringers are then laterally built up and completed by securing reinforcing structures to the side surfaces of the laterally deflected strips. A second method uses preformed cooperating treads and risers themselves as a form which defines an at least partially curved path for the stringers. Simple temporary supports both position the cooperating treads and risers and provide a solid support for laying up strips from the inside out to form stringers to support the stair and back finishing strips along curved paths defined by the cooperating treads and risers wherein the finishing strips have edges configured to interengage the outer ends of the cooperating treads in a rigid assembly and f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.