Cutting roller

Claim 2

A cutting roller for use in rock-boring equipment and comprising at least one circumferentially extending rib having an axially flattened crown surface lying between two sloping flank surfaces and being formed with a series of circumferentially spaced recesses in said crown and flank surfaces, and a plurality of inserts of wear resistant material, each insert having a crown surface between two flank surfaces and being received within a respective said recess and having its said crown and flank surfaces respectively extending out at least as far radially as the crown and flank surfaces of the rib, each said recess having substantially planar parallel axial walls and a flat bottom wall, and the cross section of each insert increasing from its working edge toward its root and having a rounded bottom surface at its root, whereby the material of said rib can, under the action of the pressure occurring during cutting, be compressed and thereby strengthened.

Claim 3

A cutting roller as claimed in claim 5 wherein the inserts have convexly curved side surfaces, with one side surface substantially larger than the other and are curved on the axially extending sides.

Claim 4

A cutting roller for use in rock boring equipment and comprising at least one circumferentially extending rib having an axially flattened crown surface lying between two sloping flank surfaces and being formed with a series of circumferentially spaced recesses in said crown and flank surfaces, and a plurality of inserts of wear-resistant material each insert having a crown surface between two flank surfaces and being received within a respective said recess and having its said crown and flank surfaces respectively extending out at least as far radially as the crown and flank surfaces of the rib, each said recess having substantially planar parallel axial walls and a bottom wall, the inserts having convexly curved side surfaces, with one side surface substantially larger than the other and being curved on the axially extending sides, having in each of said recesses a central depression, and said inserts each having a central rounded projection received in said depression, so that each insert is held in a form-locking manner, so that forces applied during use to the inserts are absorbed by the roller.

Claim 5

A cutting roller for use in rock boring equipment and comprising at least one circumferentially extending rib having an axially flattened crown surface lying between two sloping flank surfaces and being formed with a series of circumferentially spaced recesses in said crown and flank surfaces, and a plurality of inserts of wear-resistant material each insert having a crown surface between two flank surfaces and being received within a respective said recess and having its said crown and flank surfaces respectively extending out at least as far radially as the crown and flank surfaces of the rib, each said recess having substantially planar parallel axial walls and a bottom wall, the inserts having convexly curved side surfaces, with one side surface substantially larger than the other and being curved on the axially extending sides, having in each of said recesses a central depression, and said inserts each having a central rounded projection received in said depression, so that each insert is held in a form-locking manner, so that forces applied during use to the inserts are absorbed by the roller.

Claim 6

A cutting roller for use in rock-boring equipment and comprising at least one circumferentially extending rib having an axially flattened crown surface lying between two sloping flank surfaces and being formed with a series of circumferentially spaced recesses in said crown and flank surfaces, and a plurality of inserts of wear-resistant material, each insert having a crown surface between two flank surfaces and being received within a respective said recess and having its said crown and flank surfaces respectively extending out at least as Far radially as the crown and flank surfaces of the rib, each said rib being an annular member and being resiliently supported on a sleeve of said roller, which in turn is resiliently supported on a conical bush, each resilient support being by means of elastic layers, whereby the material of said rib can, under the action of the pressure occurring during cutting, be compressed and thereby strengthened.

Claim 7

A cutting roller for use in rock-boring equipment and comprising at least one circumferentially extending rib having an axially flattened crown surface lying between two sloping flank surfaces and being formed with a series of circumferentially spaced recesses in said crown and flank surfaces, and a plurality of inserts of wear-resistant material, each insert having a crown surface between two flank surfaces and being received within a respective said recess and having its said crown and flank surfaces respectively extending out at least as Far radially as the crown and flank surfaces of the rib, each said rib being an annular member and being resiliently supported on a sleeve of said roller, which in turn is resiliently supported on a conical bush, each resilient support being by means of elastic layers, whereby the material of said rib can, under the action of the pressure occurring during cutting, be compressed and thereby strengthened.

Claim 8

A cutting roller as claimed in claim 4, wherein other elastic layers also bond the ribs to the roller.