Ladder, platform & extension
US4303145A · kind A · utility
Inventor
Key dates
| Filing date | May 8, 1980 |
| Grant date | Dec 1, 1981 |
| Priority date | — |
| Expiry date | May 8, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C7/183
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A dual purpose ladder attachment usable singularly as a human body support platform with hand rails or in a pair as a scaffold jack. Each ladder attachment comprises two pairs of pivotally joined support beams. Each pair of pivotally joined support beams have their non-joined ends connected to ladder rung engaging brackets. Each bracket is sized and shaped to fit over the side rail of the ladder while engaged with a ladder rung. When the device is being used as a body support platform, a cross-bar connected between the parallel support beams supports a rigid planar surface which is also attached to a ladder rung. This platform is useful for standing on the ladder while holding the side rails. In this configuration the device is mounted to extend vertically upward on the upper side of the ladder, allowing a user to stand comfortably on the ladder. When the device is being used as a scaffold jack, the cross-bar and standing platform are removed and the ladder attachment is inverted and placed on the under side of the ladder in such a manner as to support one end of the scaffold board.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.