Spiral climb in surrounding enclosure
US6108988A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1998 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Dec 7, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B2208/12
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A modular spiral staircase within a surrounding enclosure for indoor playground equipment is disclosed. The modular spiral staircase includes individual stair treads arranged in a spiral pattern within the surrounding enclosure. The individual stair treads are vertically connected to one another and are circumferentially connected to the surrounding enclosure. Preferably, arcuate tread segments each having a plurality of integrally connected individual stair treads are provided. The individual stair treads are laterally offset from each other and are circumferentially arranged in a spiral pattern about an associated supporting central post. The surrounding enclosure includes enlarged spaced lower and upper openings that are aligned with the modular spiral staircase to facilitate entry and exit of a user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.