Device for articulating a door of a nacelle of an aircraft and nacelle provided with said articulation device

1. Aircraft nacelle comprising an external fairing comprising at least one opening adapted to be closed by a door, said aircraft nacelle being connected to said door by an articulation device, the articulation device comprising:

at least one arm connected by a first pivotal axle to the nacelle and by a second pivotal axle to the door, the first and second pivotal axles being substantially parallel,

said at least one arm comprising a first portion and a second portion movable relative to each other,

wherein the first and second portions are connected to each other by a third pivotal axle,

wherein the first portion is articulated to the nacelle through the first pivotal axle, the second portion is articulated to the door through the second pivotal axle, and said third pivotal axle extends substantially parallel to said first and said second pivotal axles and is not coaxial to said first and said second pivotal axles,

wherein the door comprises a front lateral edge and a rear lateral edge, said rear lateral edge of the door being incurved,

wherein the at least one opening comprises a front lateral edge and a rear lateral edge,

wherein the front lateral edge of the at least one opening comprises a first throat having an opening oriented rearwardly, adapted to receive the front lateral edge of the door, said first throat having a U-shaped cross-section with a first arm of the U disposed in prolongation of the fairing, a second arm of the U being offset inwardly of the nacelle,

wherein said front lateral edge of the door comprises a slight recess such that said front lateral edge of the door is disposed within the first throat, a rest of a surface of the door being disposed in prolongation of the fairing of the nacelle,

wherein the rear lateral edge of the at least one opening comprises a second throat having an opening oriented radially outwardly of the nacelle, adapted to receive said incurved rear lateral edge of the door, and

wherein the second throat has a U-shaped cross-section, ends of branches of the U are offset inwardly of the nacelle such that when the door comes into contact with said second throat or the end of the branches of the U, the external surface of the door will be in prolongation of the fairing of the nacelle,

the rear lateral edge of the door being bent so as to co-act with the second throat.

2. The aircraft nacelle according to claim 1 , wherein the first pivotal axle is offset inwardly of the nacelle and the at least one arm has an elbowed shape, such that the door will be adapted to be disposed substantially parallel and adjacent to the fairing of the nacelle in an open position.

3. The aircraft nacelle according to claim 1 , wherein the first pivotal axle is disposed at a level of a front lateral edge of the at least one opening.

4. The aircraft nacelle according to claim 1 , wherein at least one of the front lateral edge of the door and the front lateral edge of the at least one opening comprise means to prevent relative radial movement there between and at least one of the rear lateral edge of the door and the rear lateral edge of the at least one opening comprise means to prevent relative longitudinal movement there between.

5. An aircraft comprising a nacelle according to claim 1 .

6. The aircraft nacelle according to claim 1 , wherein the first and second pivotal axles are substantially vertical such that a center of gravity of the door moves in a substantially horizontal plane.

7. The aircraft nacelle according to claim 1 , wherein said first and second pivotal axles are slightly inclined relative to the vertical so as to obtain at least one of a stable open position of the door and to facilitate the opening of the door due to a weight of said door.