Dragline bucket rigging and control apparatus
US7152349B1 · kind B1 · utility
17Cited by
43References
33Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 31, 2000 |
| Grant date | Dec 26, 2006 |
| Priority date | — |
| Expiry date | Oct 31, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C47/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A large electric dragline having a housing (35) and boom (37) is provided with spaced apart in-line sheaves (34) and (36) at boom point to separate hoist ropes (31) and (32) which are led to the front and rear of bucket (30) respectively. Differential hoist rope control allows accurate and continuous adjustment of the bucket carry angle during all modes of operation. Also described is a computer control system giving continuous accurate control of carry angle by differential hoist rope operation, with manual selection of mode of operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.