US Patent 11959730 Armored cab for blast protection

An exterior shell for an armored cab having a longitudinal axis and a transverse axis is provided. The exterior shell has a right side panel extending parallel to the longitudinal axis, a left side panel extending parallel to the longitudinal axis, and a rear panel extending parallel to the transverse axis. A cab lower surface extends between the right side panel and the left side panel. The cab lower surface has a center tunnel extending along the longitudinal axis with an exterior curvature having a variable radius as the center tunnel extends along the transverse axis of the exterior shell. The center tunnel is configured to act as a pressure vessel in the event of an explosion beneath the armored cab.