Rock cutting tip inserts
AssigneeCoal Industry (Patents) Limited
InventorsPeter Kenny, Stanley N. Johnson
Life of this patent
Estimating the term…
Abstract
The rock cutting tip insert of a rock cutting tool comprises two layers, the front layer being harder than the backing or base layer by at least one hundred units on the Vickers Hardness scale.
Claims11
A rock cutting tip insert for placing in a recess of a rock cutting tool, the tip insert comprising two separate continuous layers of similar composite material having different hardness, a first layer being a cutting margin of one hardness level and the second layer being a backing portion of material similar to the first layer having a second hardness level, of at least one thousand units on the Vickers Hardness scale, said first hardness level being at least one hundred units on the Vickers Hardness scale greater than said second hardness level, the first layer cutting margin being secured to the second layer backing portion, and the second layer backing portion being secured to the tool.
A rock cutting tool including a body and a rock cutting tip insert carried by the body and comprising a tool body having a recess for receiving a rock cutting tip, the tip having first and second continuous layers of similar composite material having different hardness, the first layer comprising a cutting margin of one hardness level and the second layer comprising a backing portion of a second hardness level, and means for securing the second layer backing portion to the tool body, said first hardness level being at least one hundred units on the Vickers Hardness scale greater than said second hardness level.
Dependencies are inferred from the claim text.