Boring or penetrating the earth – Below-ground impact members
Patent
1998-11-03
2000-08-29
Will, Thomas B.
Boring or penetrating the earth
Below-ground impact members
166178, E21B 2300, E21B 31107
Patent
active
061093734
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.
REFERENCES:
patent: 311157 (1885-01-01), Wheeler
patent: 335493 (1886-02-01), Wheeler
patent: 1200465 (1916-10-01), Bryson
patent: 1593430 (1926-07-01), Bryson
patent: 2347726 (1944-05-01), Auld et al.
patent: 3570598 (1971-03-01), Johnson
patent: 3834471 (1974-09-01), Bottoms
patent: 4061389 (1977-12-01), Keller et al.
patent: 5327982 (1994-07-01), Trahan et al.
Boart Longyear International Holdings, Inc.
Johnson Clayton R.
Petravick Meredith C.
Will Thomas B.
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