Folding down the body to the wheel carriage or by retracting projecting

Official title: {folding down the body to the wheel carriage or by retracting projecting parts (collapsible containers B65D, e.g. B65D7/24, B65D9/12, B65D11/18)}

B62B3/022 (Folding down the body to the wheel carriage or by retracting projecting) appears on 257 US grants and 285 published applications in this corpus.