Method of making staircases and staircase made thereby
US4322927A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 1979 |
| Grant date | Apr 6, 1982 |
| Priority date | — |
| Expiry date | Sep 4, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04F11/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of making a closed-tread staircase, and of making steps for such a staircase. The tread and riser of each step are each made from a rebated, grooved slab; the rebates on tread and riser are mated to form a joint, which is secured by a joining strip of `V`-shaped cross-section formed with flanges which are forced into the slab grooves. Steps are joined together in the same manner, and a staircase formed by supporting a series of steps upon two or more stair carriages, each carriage comprising a stringer with a series of spaced cleats secured to one side. Each cleat provides a horizontal tread-supporting portion and a vertical riser-supporting portion. Each stair carriage may be made using apparatus which provides means for supporting and indexing a stringer and supporting each cleat at a predetermined angle while cleat and stringer are secured together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.