Patent ID: 9381993
Filing Date: 2016-07-05
CPC Classification: B64C

Claim Text:
1. An airframe panel for aircraft comprising: a skin having an inner surface; and a plurality of stringers provided on the skin along a first direction, the plurality of stringers each comprising a base portion extending from the inner surface of the skin and a web portion extending from the base portion, the base portion being wider than the web portion; wherein the skin includes a first region in which a rib is provided along a second direction that intersects the first direction, and a second region in which the rib is not provided, wherein the skin comprises a raised surface portion integral with and extending from the inner surface, the raised surface portion having a raised support surface that is flat and is integral with and connects the base portion of two adjacent stringers of the plurality of stringers in the first region, wherein a stepped surface connects the two adjacent stringers in the second region, wherein the rib contacts the raised support surface of the skin, wherein a region of the skin having the raised support surface and the base portion of two adjacent stringers has a constant thickness along the second direction, wherein the plurality of stringers and the skin comprise a single, unitary piece of a base material, and wherein the plurality of stringers are integrally formed with the skin by machining out of the base material.