Strand lifting system
US4274618A · kind A · utility
Inventor
Key dates
| Filing date | Aug 20, 1979 |
| Grant date | Jun 23, 1981 |
| Priority date | — |
| Expiry date | Aug 20, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66D3/006
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Steel strand is passed through a plurality of upper and lower multi-part chucks which each are capable of grasping and holding steel strand passed through it when they are seated in upper and lower seating chambers, respectively. Upper and lower hydraulic seating rams comprise pistons used to cause chuck seating plates to be driven against the top flanges of the upper and lower chucks, thereby causing them to seat within their respective seating chambers. Either or both the top and bottom chucks may be seated at the same time. A hydraulic system allows an operator to smoothly lift and lower loads through the seating and unseating of the upper and lower chucks and the extending and retracting of pistons of main lifting rams interposed between plates containing the upper and lower chuck seating chambers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.