Cable overshot apparatus
US6109373A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 3, 1998 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Nov 3, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B31/107
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The overshot apparatus includes a head subassembly coupleable to the overshot coupling device of an inner tube assembly, a jar subassembly having an outer swivel end portion for having a wire line attached thereto and a tubular member and a cable subassembly having an axially elongated cable, an axial outer cable mount mounted to the tubular member with the cable extended therethrough and into the tubular member and providing a jar head, and an axial inner cable mount providing a jar member mounting the cable to the head subassembly and having the jar head delivering hammering blows thereto. The cable is of a rigidity for being movable into the tubular member to permit the jar head moving delivering a hammering blow to the jar member and a spread apart position. The cable is of a flexibility that when the subassemblies are in a spread apart position and the overshot assembly is being lowered with an inner tube assembly coupled thereto, the cable is arcuately bendable as the inner tube assembly is moved from a vertical condition to a horizontal position on the ground with the central axes of the subassemblies extending less than about 135 degrees relative to one another.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.