Combination ladder and stair
US5323874A · kind A · utility
5Cited by
3References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1993 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | Sep 7, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C7/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention disclosed comprises a combination ladder and stair for use by children which incorporates stair-like treads and risers with ladder-like rungs to achieve safe climbing activity. The combination ladder and stair is adapted to be used at a comparatively steep angle to the ground with the treads being maintained level. The rungs are placed adjacent to and level with each tread to afford additional security for the foot, and are spaced from the tread to allow the hand to grasp around the rung. In the preferred embodiment the ladder is incorporated into a split tube which serves as an entry to a children's play system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.