Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Core-retaining or severing means
Patent
1990-04-20
1991-07-16
Britts, Ramon S.
Boring or penetrating the earth
With means movable relative to tool to receive, retain, or...
Core-retaining or severing means
175333, 175404, E21B 2500
Patent
active
050317083
ABSTRACT:
Disclosed herein is a drill stem having a core bit mounted thereon and an inner tube assembly having an inner tube mounting a corebreaker case that either has or in conjunction with the inner tube provides a corebreaker recess having an upwardly facing planar edge. Advantageously a stop ring and a non-axial split annular corebreaker are mounted in the recess with the stop ring being between the corebreaker and inner tube, even though the corebreaker may be axially slit and/or no stop ring used. The corebreaker has inner and outer peripheral surfaces that are of constant diameters, axial opposite transverse inner and outer planar edges while the recess is in part defined by planar edges. At least one of the parallel edges is inclined to the tube central axis when the core breaker is in its core taking position. The corebreaker is cockably movable between a datum position that its axis is inclined relative to the case axis for breaking a core and retaining the broken-off core in the inner tube as being retrieved, and the core taking position that the corebreaker axis is coextensive with or parallel to the central axes of the bit, inner tube and the corebreaker case to permit the core extending thereinto.
REFERENCES:
patent: 643082 (1900-02-01), Bullock
patent: 648920 (1900-05-01), Bullock
patent: 790331 (1904-08-01), Terry
patent: 1663096 (1928-03-01), Phipps
patent: 1720700 (1929-07-01), Stone
patent: 1773171 (1930-08-01), Copelin
patent: 1848453 (1932-03-01), Zublin et al.
patent: 2490512 (1949-12-01), Deely
patent: 2522399 (1950-09-01), Pickard
patent: 2829868 (1958-04-01), Pickard et al.
patent: 3340939 (1967-09-01), Lindelof
patent: 3428138 (1969-02-01), Casper et al.
patent: 3540537 (1970-11-01), Brown
Britts Ramon S.
Johnson Clayton R.
Longyear Company
Schoeppel Roger J.
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