Abstract: A lift device includes two vertical extendible tower members, each of the two vertical extendible tower members including, at a first lower distal end, an omnidirectional wheel assembly, and a vertical extension assembly configured to simultaneously raise and lower the two vertical extendible tower members in a vertical direction. The lift device further includes a horizontal extendible transverse member connected between second opposing distal upper ends of the two vertical extendible tower members.

Abstract: A lift device and method of operation thereof including two vertical extendible tower members supporting a horizontal extendible transverse member, a payload lifting device and a traveler carriage configured to translate the payload between the two vertical extendible tower members along the horizontal extendible transverse member, an omnidirectional wheel assembly, a navigation control system configured to provide navigation control to the lift device via the omnidirectional wheel assembly based on a navigation path, one of a proximity sensing system and a machine vision system configured to determine one of a presence of an obstacle or an absence of a previously detected obstacle relative to the navigation path, and a motion control system configured to provide a smooth motion control signal and a retract or expand signal to the respective members of the lift device.