| 主权项 |
1. A door frame provided at an opening made in a fuselage of an aircraft that is delimited by a skin, said door frame comprising:
an upper longitudinal stiffener and a lower longitudinal stiffener; two vertical substructures connected by said upper and lower longitudinal stiffeners, each of said vertical substructures being arranged on a respective opposite side of the opening; and at least one stop provided at a level of the opening that uptakes radial forces exerted by the door; wherein each vertical substructure has a structure made of composite material with a first wall, a second wall that is connected to the first wall, and arranged essentially perpendicular to the first wall, and a third inclined wall that connects the first wall and the second wall in such a way as to obtain a box substructure having a closed and hollow cross-section in a sectional plane perpendicular to a vertical extent of the vertical substructure, wherein the first wall forms an edge of the opening, and the second wall is configured to be arranged in the plane of the skin of the fuselage. |
