US Patent 10894663 Automated storage and retrieval system

An autonomous transport vehicle including a frame forming a payload area, telescoping arms movably mounted to the frame, each telescoping arm being configured for extension and retraction relative to the frame along an extension axis to effect transfer of at least one pickface to and from the payload area, and traversal, relative to the frame, in at least one direction that is angled to the extension axis, and at least one tab extending from each telescoping arm where the at least one tab extends in a direction transverse to the direction of extension and retraction, and the at least one tab on one of the telescoping arms opposes the at least one tab on another of the telescoping arms.