Portable balanced motion compensated lift apparatus
US4593885A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1984 |
| Grant date | Jun 10, 1986 |
| Priority date | — |
| Expiry date | Jun 29, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S254/90
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A motion compensating device that is installed on a lift line between a crane and an object to be lifted. The device limits dynamic loads on the line by taking up and letting out line by preventing the lift line from going slack and by lengthening acceleration time. The device consists of a hydraulic system and sheave mechanical system arranged in combination together with a balancing system for a given load range. The device is balanced for a given load range to provide a full range of compensation while hanging free. Balance is provided by offsetting a load line a calculated distance Y from a vertical line drawn through a lift point. This offset compensates for turning moments of the apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.