Rotational guidance device for a drilling tool and associated method
AssigneeBreakthrough Design
InventorFrançois Guy, Jacques, René MILLET
Life of this patent
Estimating the term…
Abstract
A device for guiding a drilling tool in rotation, the device including a tubular longitudinal element, a transmission shaft passing longitudinally through the tubular element, the shaft being rotatably mounted in the tubular element for rotating the drilling tool, the guiding device including bearing blocks mounted between the tubular element and the shaft, each bearing block being attached to at least one attachment region on the shaft, characterized in that the bearing block including at least one tapered bore ball-joint roller bearing, wherein at least in the attachment region, the shaft has a taper less than or equal to 1:12 and/or bend radii greater than 1/12th of the outer diameter of the shaft.
Claims10
A device for guiding a drilling tool in rotation, the device including a tubular longitudinal element, a transmission shaft passing longitudinally through the tubular element, the shaft being rotatably mounted in the tubular element in order to rotate the drilling tool and to transmit axial forces thereto, the guiding device comprising bearing blocks mounted between the tubular element and the shaft, each bearing block being attached to at least one attachment region on the shaft, wherein the bearing block includes at least one tapered bore ball-joint roller bearing forming a pivot linkage, a sliding pivot linkage, an ball joint linkage or a linear annular linkage between the tubular element and the shaft, and wherein, at least in the attachment region, the shaft has a taper less than or equal to 1:12 and/or bend radii greater than 1/12th of the outer diameter of the shaft.
Dependencies are inferred from the claim text.