Abstract: A load-handling device for lifting and moving containers, the load-handling device including a body configured to house one or more operation components; a container-receiving space configured to accommodate at least part of a container; a container-engaging assembly configured to releasably engage a container; and a raising and lowering assembly configured to raise and lower the container-engaging assembly.

Abstract: A load-handling device is provided for lifting and moving containers stacked in stacks in a storage system. The load-handling device includes a body; a wheel assembly arranged to support the body; a container-lifting mechanism configured to lift a container into or out of the body; and a wheel-positioning mechanism with wheel-engaging functionality for selectively engaging either a first set of wheels of the wheel assembly with a first set of rails or tracks of the storage system, or a second set of wheels of the wheel assembly with a second set of rails or tracks of the storage system. A wheel-engaging device can include at least one non-vertically-orientated linear actuator and/or at least one eccentric-rotation-based wheel-engaging device.