Foldable step stool
US3999629A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1975 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Oct 6, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C1/393
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A foldable step stool comprises a pair of rectangular frame members, one disposed within the other and having pivotally connected side rails thus permitting the members to assume an open position, in which the side rails intersect in an "X"-configuration, and a closed position in which the inner frame is contained entirely within the outer frame. Two steps extend between the side rails of the frame members, the ends of one step being pivotally secured to the side rails of the inner frame member and having a pin-and-slot connections to the side rails of the outer frame member. The second step is similarly arranged with the pivotal and pin-and-slot connections reversed with respect to the inner and outer frame members. When in the closed position, the steps lie completely within the three dimensions of the outer frame member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.