Patent ID: 7401709

Claim:
An attachable device for positioning a container on an existing shelf tray of an existing shelf tray assembly of a vertically accumulating storage and retrieval apparatus, said existing shelf tray assembly having front and rear portions and a container arresting assembly for contacting a container at a first contact location, said device comprising: a container abutting portion having opposing ends; and elongated adjustable engagement structure, wherein said engagement structure comprises elongated engagement members connected to said opposing ends of said container abutting portion, said elongated engagement members having a plurality of spaced apart engagement positions for detachably engaging said device to said container arresting assembly of said existing shelf tray assembly in a plurality of different possible locations so as to position said container abutting portion of said device on said existing shelf tray and thereby change said first contact location on said existing shelf tray to one of a plurality of different possible contact locations, without modifying said existing shelf tray assembly.