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US 4,722,615 AGranted
Drilling apparatus and cutter therefor
AssigneeA-Z International Tool Company
InventorsThomas F. Bailey, John Campbell
Life of this patent
Estimating the term…
Abstract
An underreamer including a body having a bore therethrough, an arm mounted at its upper end to the body, a conical cutter mounted for rotation on the lower end of each arm, a cup-shaped thrust bearing between the cutter and the arm, means extending through the arm to secure the cutter on the arm including pin elements that extend into a groove in the cutter to prevent rotation movement between the arm and the thrust bearing to lock the thrust bearing to the arm. The arms are pivotally mounted in slots in the body and means are provided for moving the arms to their cutting position with their lower ends positioned radially outward from the body.
Claims16
A drilling apparatus comprising:
- a body having a bore therethrough and a longitudinal slot in its wall;
- an arm mounted at its upper end to said body;
- a conical cutter having formation cutting means around its outer periphery, a central bore extending part way therethrough having an end wall and an annular side wall and groove means in said annular side wall;
- assembly means extending through said arm and into said bore for securing said cutter rotationally on said arm including pin means on said arm;
- and
- thrust bearing means surrounding said pin means and engaging said central bore, said assembly means comprising lobe means forming a part of said thrust bearing means extending into said groove means upon assembly of the apparatus, means for preventing rotation between said thrust bearing means and said pin means, and means for keeping said lobe means in said groove means;
- said means for preventing rotation including at least one pin element, said pin means having a central bore, side bore means in the side of said pin means extending from the outside of the pin means into said central bore of the pin means, said pin element being adapted to slide within said side bore means and in a first position to have at least a portion thereof slide into said central bore of said pin means and in a second position to position said lobe means in said groove means, and means in said central bore of said pin means for retaining said pin element in said second position.
4 more elements
A drilling apparatus comprising:
- a body having a bore therethrough and a longitudinal slot in its wall;
- an arm mounted at its upper end to said body;
- a conical cutter having formation cutting means around its outer periphery, a central bore extending part way therethrough having an end wall and an annular side wall and groove means in said annular side wall;
- assembly means extending through said arm and into said bore for securing said cutter rotationally on said arm including pin means on said arm;
- and
- thrust bearing means surrounding said pin means and engaging said central bore, said assembly means comprising lobe means forming a part of said thrust bearing means extending into said groove means upon assembly of the apparatus, means for preventing rotation between said thrust bearing means and said pin means, and means for keeping said lobe means in said groove means;
- said thrust bearing means comprising a split thrust bearing that includes two elements which when placed together form a cup-shaped bearing surrounding said pin means and each such element having a lobe thereon adapted to fit within said groove means.
4 more elements
A drilling apparatus comprising:
- a body having a bore therethrough and a longitudinal slot in its wall;
- an arm mounted at its upper end to said body;
- a conical cutter having formation cutting means around its outer periphery, a central bore extending part way therethrough having an end wall and an annular side wall and groove means in said annular side wall;
- assembly means extending through said arm and into said bore for securing said cutter rotationally on said arm including pin means on said arm;
- and
- thrust bearing means surrounding said pin means and engaging said central bore, said assembly means comprising lobe means forming a part of said thrust bearing means extending into said groove means upon assembly of the apparatus, means for preventing rotation between said thrust bearing means and said pin means, means for keeping said lobe means in said groove means;
- said thrust bearing means being a split thrust bearing that includes two elements which when placed together from a cup-shaped bearing surrounding said pin means and each such element has a lobe thereon adapted to fit within said groove means in said cutter central bore;
- said means for preventing rotation includes at least one pin element in each thrust bearing element, said pin means having a central bore, side bore means in each side of said pin means extending from the outside of the pin means into said central bore of the pin means, said thrust bearing elements each having bore means on the inside thereof mating with said side bore means, said pin element being adapted to slide within said side bore means and in a first position to have a portion thereof slide into said central bore of the pin means and in a second position to have a portion thereof extend into the bore means in the thrust bearing element to position said lobe in said groove means, and means in said central bore of the pin means for holding said pin element in said second position.
5 more elements
Dependencies are inferred from the claim text.