Drilling unit
AssigneeMincon Nordic Oy
InventorJoseph Purcell
Life of this patent
Estimating the term…
Abstract
A drilling unit for drilling a hole, wherein the drilling unit comprising a drilling head (1). Said drilling head (1) further comprising pulling means (2) for pulling a casing (7) into the hole, a pilot bit (3) for drilling a center hole, connecting means and a ring bit assembly (4) for reaming the center hole for the casing (7). Said ring bit assembly (4) being connected to said pilot bit (3) by the connecting means and to said casing (7) by the pulling means (2). Said ring bit assembly (4) comprising a carrier (5) comprising carrier coupling means (23) and a plurality of ring bit segments (6) movably attached to said carrier coupling means (23).
Claims18
A drilling unit for drilling a hole, the drilling unit comprising a drilling head, said drilling head further comprising:
- pulling means for pulling a casing into the hole;
- a pilot bit for drilling a center hole;
- connecting means;
- and
- a ring bit assembly for reaming the center hole for the casing;
- wherein said ring bit assembly is connected to said pilot bit by the connecting means and to said casing by the pulling means,
- wherein said ring bit assembly comprises:
- a carrier comprising carrier coupling means;
- and
- a plurality of ring bit segments movably attached to said carrier coupling means, the pilot bit being connected to the ring bit assembly by the ring bit segments,
- wherein the carrier coupling means comprise a plurality of carrier holes and carrier ribs, and the ring bit segments comprise a segment impact shoulder and a segment reamer shoulder,
- wherein said segment impact shoulders are attached into the carrier holes, and
- wherein said segment reamer shoulders and the segment impact shoulders are arranged to attach the ring bit segments to said carrier ribs from the inside of the carrier when said ring bit segments are in the extended position.
A drilling unit for drilling a hole, the drilling unit comprising a drilling head, said drilling head further comprising:
- pulling means for pulling a casing into the hole;
- a pilot bit for drilling a center hole;
- connecting means;
- and
- a ring bit assembly for reaming the center hole for the casing;
- wherein said ring bit assembly is connected to said pilot bit by the connecting means and to said casing by the pulling means,
- wherein said ring bit assembly comprises:
- a carrier comprising carrier coupling means;
- and
- a plurality of ring bit segments movably attached to said carrier coupling means, the pilot bit being connected to the ring bit assembly by the ring bit segments,
- wherein the connecting means comprise:
- first locking means located on a circumferential outer surface of the pilot bit;
- and
- second locking means located on a surface of the ring bit segment;
- and
- wherein said first locking means are arranged to receive said second locking means for locking the ring bit assembly and the pilot bit together.
A method of making ring bit segments for use with a drilling unit for drilling a hole, the method comprising:
- preparing a ring billet;
- forming segment impact shoulders and segment reamer shoulders;
- and
- cutting the formed ring billet to smaller pieces for forming ring bit segments,
- wherein the drilling unit comprises a drilling head, said drilling head comprising:
- pulling means for pulling a casing into the hole;
- a pilot bit for drilling a center hole;
- connecting means;
- and
- a ring bit assembly for reaming the center hole for the casing;
- wherein said ring bit assembly is connected to said pilot bit by the connecting means and to said casing by the pulling means,
- wherein said ring bit assembly comprises:
- a carrier comprising carrier coupling means;
- and
- the formed ring bit segments movably attached to said carrier coupling means, the pilot bit being connected to the ring bit assembly by the ring bit segments;
- wherein the carrier coupling means comprise a plurality of carrier holes and carrier ribs, and the ring bit segments comprise the segment impact shoulders and the segment reamer shoulders, wherein said segment impact shoulders are attached into the carrier holes, and wherein said segment reamer shoulders and the segment impact shoulders are arranged to attach the ring bit segments to said carrier ribs from the inside of the carrier when said ring bit segments are in the extended position.
A method of making a drilling unit for drilling a hole, the method comprising:
- preparing a ring billet;
- forming segment impact shoulders and segment reamer shoulders;
- cutting the formed ring billet to smaller pieces for forming ring bit segments;
- and
- incorporating the formed ring bit segments into the drilling unit, wherein the drilling unit comprises a drilling head, said drilling head comprising:
- pulling means for pulling a casing into the hole;
- a pilot bit for drilling a center hole;
- connecting means;
- and
- a ring bit assembly for reaming the center hole for the casing;
- wherein said ring bit assembly is connected to said pilot bit by the connecting means and to said casing by the pulling means,
- wherein said ring bit assembly comprises:
- a carrier comprising carrier coupling means;
- and
- the formed ring bit segments movably attached to said carrier coupling means, the pilot bit being connected to the ring bit assembly by the ring bit segments;
- wherein the carrier coupling means comprise a plurality of carrier holes and carrier ribs, and the ring bit segments comprise the segment impact shoulders and the segment reamer shoulders, wherein said segment impact shoulders are attached into the carrier holes, and wherein said segment reamer shoulders and the segment impact shoulders are arranged to attach the ring bit segments to said carrier ribs from the inside of the carrier when said ring bit segments are in the extended position.
Dependencies are inferred from the claim text.