Stairs and method of making the same
US4367613A · kind A · utility
Inventor
Key dates
| Filing date | Feb 20, 1981 |
| Grant date | Jan 11, 1983 |
| Priority date | — |
| Expiry date | Feb 20, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04F11/025
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A construction for wooden stairs that permits standardized, factory machined components to be pre-packaged and shipped to the job site where they can be installed to fit almost any installation. The structure includes stringers which have riser and tread receiving grooves on both sides. The grooves on each side of the stringer provide for a different rise and run rate. The construction technique and the resulting stairs substantially reduces the job-site layout and assembly time from that required with conventional stairs. It also reduces the number of components that must be produced and stocked. The technique is especially applicable when employed with wooden stairs of the interlocking type that generally need no fasteners, adhesives or wedges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.