Abstract: A structure installed at a station can include an interference member held above a mobile drive unit area of the station. The interference member can be positioned to allow an inventory holder and a mobile drive unit to pass underneath. The interference member can also be positioned to contact a topside of the inventory holder to prevent the inventory holder from tipping into a worker area of the station that is adjacent to the mobile drive unit area.

Abstract: A mechanism for transferring a wheelchair through a side door opening of a motor vehicle includes a hoisting device (10,13) disposed in the vehicle and a linkage (16,17, 20) linking the chair to the hoist. Once hoisted off the ground, the wheels of the chair are retracted and the chair is swung by the parallel links (16, 17) through the door opening. The chair is suspended at a rear corner of a generally box-like frame so that final pivoting of the chair about its point of suspension not only brings the chair to its front facing position in the vehicle but simultaneously completes its sideways movement into the vehicle. The chair is then lowered into its seated position.

Abstract: A mechanism for transferring a wheelchair through a side door opening of a motor vehicle includes a hoisting device disposed in the vehicle and a linkage linking the chair to the hoist. Once hoisted off the ground, the wheels of the chair are retracted and the chair is swung by the parallel links through the door opening. The chair is suspended at a rear corner of a generally box-like frame so that final pivoting of the chair about its point of suspension not only brings the chair to its front facing position in the vehicle but simultaneously completes its sideways movement into the vehicle. The chair is then lowered into its seated position.