Lifting hoist assembly
US7424932B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Sep 2, 2004 |
| Grant date | Sep 16, 2008 |
| Priority date | — |
| Expiry date | Nov 20, 2024 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C7/488
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hoisting device and method for hoisting material up an extension ladder. The device includes a load-carrying carriage having a wheel and roller axle assembly that also serves as rollers for engagement with the rails of the ladder. The wheel and roller axle assembly allows the cart to transition from the ladder rails to the roof surface. Also provided is a dual braking means that serves to prevent the carriage from rolling back down the ladder or off of the roof in cases of cable malfunction. The method employs a hoisting mechanism having a removable winch used in conjunction with a releasable coupled pull cable that is brought to the roof surface on the carriage, detached from the carriage, mounted on the roof and used to return the carriage to and from the roof during hoisting operations. An infinitely adjustable ladder support is provided to support the ladder during a hoist.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.