US 12,466,536 B2
Aircraft stair system using bumper arrangement
Michael John Seibel, Wichita, KS (US); Jamie L. Taber, Wichita, KS (US); and Sidney Aloysius Mohr, Clearwater, KS (US)
Assigned to Textron Innovations Inc., Providence, RI (US)
Filed by Textron Aviation Inc., Wichita, KS (US)
Filed on Feb. 2, 2023, as Appl. No. 18/163,762.
Claims priority of provisional application 63/305,806, filed on Feb. 2, 2022.
Prior Publication US 2023/0242255 A1, Aug. 3, 2023
Int. Cl. B64C 1/24 (2006.01); A47B 5/04 (2006.01); A47B 31/06 (2006.01); B64D 9/00 (2006.01); H01F 7/02 (2006.01)
CPC B64C 1/24 (2013.01) [A47B 5/04 (2013.01); A47B 31/06 (2013.01); B64D 9/00 (2013.01); H01F 7/0252 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A system configured to prevent abrupt collapse of a first structure against a second structure around a rotational axis comprising:
a bumper having an at least partially flexible body;
the body having a base portion attached to the first structure;
the body having a linking portion rising up from a rear of the base portion;
the body having a lever portion extending forwardly from the linking portion;
a gap disposed between an underside of the lever portion and the base portion, the gap being configured to at least partially close upon a contact received from the second structure onto an upper surface of the lever portion;
wherein the rotational axis is established by a hinge between the first and second structures and the bumper is attached to the first structure at a location proximate the hinge in an area onto which the second structure would otherwise impact; and
wherein the first and second structures are independent portions of a foldable stairway.