Patent ID: 8505870

Claim:
A pair of shear blades to be provided in a ram blowout preventer for cutting a tubular, the pair of shear blades comprising: a first blade having first blade cutting edges provided substantially in a same horizontal plane and extending horizontally across the first blade; a second blade having upper and lower second blade cutting edges provided in two horizontal planes substantially parallel with each other and extending horizontally across the second blade, and a horizontally extending recess between the upper and lower second blade cutting edges, the recess having a length at least equal to a total length of the first blade cutting edges, so that the first blade cutting edges fit into the recess between the upper and lower second blade cutting edges when the blades are moved toward a shearing position; and wherein the first blade has a projection portion protruding past the first blade cutting edges and configured to fit into the recess of the second blade.