US Patent 11390505 Lift device with articulated boom

A frame, a boom assembly, and an actuator. The boom assembly includes a first boom section having a proximal end coupled to the frame and a distal end opposite the proximal end and a second boom section pivotably coupled to the distal end of the first boom section. The actuator is reconfigurable between a locked configuration and an unlocked configuration. The actuator permits the boom assembly to move freely when the actuator is in the unlocked configuration. In the locked configuration, the actuator is positioned to couple the second boom section to the frame such that the actuator limits movement of the first boom section relative to the frame.