Boring or penetrating the earth – Processes
Patent
1988-05-20
1989-09-12
Novosad, Stephen J.
Boring or penetrating the earth
Processes
173164, 175170, 175195, E21B 302, E21B 1200, E21B 1916
Patent
active
048651354
ABSTRACT:
A torque reactor for a top drive drilling rig converts reactive torque on the top drive housing into a rotational torque on a torque shaft. The torque shaft extends vertically in the derrick parallel with the drive stem. A torque case carries two bushings, one of the bushings receiving the drive stem of the top drive and the other slidingly receiving the torque shaft. The drive unit bushing is rigidly connected to the housing of the top drive. The torque shaft bushing will transmit rotational force to the torque shaft. Linkages interconnect the bushings. Rotational torque imposed on the drive unit bushing creates a rotational torque in the torque shaft bushing. That torque is transmitted to the torque shaft which is held stationary to absorb the torque.
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patent: 2998084 (1961-08-01), Johnson et al.
patent: 3012619 (1961-12-01), Farque
patent: 3857450 (1974-12-01), Guier
patent: 3874196 (1975-04-01), Hisey et al.
patent: 3920087 (1975-11-01), Hisey et al.
patent: 4458768 (1984-07-01), Boyadjieff
patent: 4589503 (1986-05-01), Johnson et al.
Bradley James E.
Hughes Tool Company
Novosad Stephen J.
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