Back to results
US 5,224,560 AGranted
Modular drill bit
AssigneeModular Engineering Corporation
InventorCarlos Fernandez
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeModular Engineering Corporation
InventorCarlos Fernandez
Estimating the term…
A modular drill bit mounts legs within recesses in a body which are parallel to the central axis of the body using threaded studs with tapered outer portions, in conjunction with an attached pin having recesses therein receiving the upper ends of the legs. The lower ends of the legs terminate in spindles of open face configuration rotatably receiving cones thereon for rotation via a arrangement of bushings, roller bearings and thrust bearings, and a plurality of seals which slide and therefore rotate relative to both the leg spindle and the cone with the help of pressure compensating apparatus. Each cone is provided with cutting teeth which are inclined in the direction of cone rotation and which cover the cone surface in a manner which provides scraping of substantially the entire bottom surface of the hole being drilled and in a manner providing efficient scraping and crushing action. The cutting teeth are mounted in holes in the cone and then brazed in place, as are a plurality of ceramic buttons mounted within the extended portion of the cone to protect such portion and to provide backup gauging for a row of large cutting teeth mounted on an outer rim of the cone and having the cutting edges thereof inclined in alternating fashion.
A method of making a cone assembly for a drill bit, comprising the steps of:
A method of making a cone assembly for a drill bit, comprising the steps of:
A cone assembly apparatus for a drill bit comprising the combination of:
A cone assembly apparatus for a drill bit comprising the combination of:
Apparatus for use in a drill bit comprising a cone having a central axis about which the cone is intended to rotate in a given direction and having a plurality of cutting teeth on an outer surface thereof, each of the cutting teeth being inclined in the direction of intended rotation of the cone so as to form an acute angle with an axis perpendicular of the outer surface of the cone at the location of the cutting tooth.
Apparatus for use in a drill bit comprising a cone having a central axis and having an outer rim on which a plurality of cutting teeth are mounted in a row, the cutting teeth having cutting edges which alternate in direction along the row of cutting teeth, the cutting edges of alternate ones of the cutting teeth being inclined by generally like angles on one side of axes extending in the direction of the central axis of the cone and the cutting edges of remaining ones of the cutting teeth being inclined by the generally like angles on the other side of the axes extending in the direction of the central axis of the one.
Drill bit apparatus comprising the combination of:
Apparatus for use in a drill bit comprising a cone having a central axis and having a plurality of cutting teeth extending outwardly from an outer surface thereof, the cutting teeth being disposed within a plurality of different circles on the outer surface of the cone, each of the circles being non-concentric with the other circles and with the central axis of the cone and lying in a plane which is non-perpendicular with the central axis of the cone.
Apparatus for use in a drill it comprising a cone having a central axis and a conical surface thereof, the conical surface having first and second halves thereof on opposite sides of the central axis, the first half having a plurality of generally parallel axes on the surface thereof along which a first plurality of cutting teeth are mounted, and the second half having a plurality focused axes thereon emanating from the central axis and curving in a like direction and along which a second plurality of cutting teeth are mounted.
Apparatus for use in a drill bit comprising a cone having a central axis and a conical surface thereof, the conical surface having first and second halves thereof on opposite sides of the central axis, the first half having a plurality of generally in directions away from the second half and along which a first plurality of cutting teeth are mounted, and the second half having a plurality of curved axes spaced at increasing distances form the central axis and along which a second plurality of cutting teeth are mounted.
Dependencies are inferred from the claim text.