METHOD FOR OPENING/CLOSING AN AIRCRAFT DOOR AND AIRCRAFT IMPLEMENTING SUCH A METHOD

Abstract

A door (3) of an aircraft (1) equipped with an opening/closing mechanism, the movement which is in a main horizontal plane (P) of the aircraft (1) is controlled by coupling between the door (3) and the frame (4) on a control ramp (7) and on two front (AV) and rear (AR) guides (8,9), arranged between the respective front (AV) and rear (AR), and the frame (4) coupled to at least one handling arm (5, 6) hinged in rotation on a front side (AV) of the frame (4) and to the door (3) via a forearm (5b, 6b).

Claims

1. A method for opening/closing a door (3) arranged in an opening of a fuselage of an aircraft (1), the opening being defined by a frame structure (4), the door (3) comprising an inside face (3i), front part (AV), and rear (AR) parts defined with respect to a longitudinal axis (X′X) of the aircraft (1) oriented conventionally, the door (3) and the frame (4) of the aircraft (1) comprising front and rear positioning stops for positioning the door (3) in the frame (4), the kinematics of the movements of the door (3) relative to the fuselage (2) taking place from the frame (4) in a main horizontal plane (P) of the aircraft (1) by at least one manipulation arm (5, 6) coupled to an articulation forearm (5b, 6b) on the door (3) and being piloted, reversibly, by at least one guide (8, 9) between a closed position in abutment in the frame (4) and an open position outside the frame (4) on the inside face of the door (3) against the fuselage (2), the method comprising the following steps for opening the door (3): guiding a slide control element (7) for opening the door (3) to positions towards the front part (AV) and towards the rear part (AR) of the aircraft (1); generating a first movement of the door (3) by the control element (7) (3) towards the rear (AR)—and towards the interior of the aircraft (1) by a combination of slide guides (8, 9) of the front (AV) and rear (AR) parts of the door (3) respectively in rotation and in translation, which releases the stops (12) of the door (3) from the stops (11) of the fuselage (2); moving the door (3) by rotation about the rear guide (8) and inclined translation towards the front part (AV) and the outside (EXT) of the aircraft (1) along the front guide (9), the front part (AV) of the door (3) and the front stops (12) then disengaging from the frame (4) towards the outside (EXT) of the aircraft (1); and articulating the arm (5, 6) in rotation about an articulated link (20) on a front side (AV) of the frame (4) in order to move the door (3) towards the front part (AV) of the aircraft (1), its movement ending outside the frame (4) with the inside face (3i) of the door (3) against the fuselage (2).

2. The opening/closing method as claimed in claim 1, wherein in the closing mode, the successive steps of the opening mode are linked together in reverse kinematics.

3. The opening/closing method as claimed in claim 1, wherein return devices (5a, 6a) adapts position of the forearm (5b, 6b) relative to the arm (5, 6) by extension of the return devices (5a, 6a) to generate a rotational movement of the rear part (AR) of the door (3) as well as a translation of the door (3) towards the front (AV) of the aircraft (1) parallel to the fuselage (2), the rear part (AR) and front part (AV) door stops (12) then being out of the frame (4).

4. An aircraft (1) comprising: at least one door (3) equipped with an opening/closing mechanism for implementing the method as claimed in claim 1, wherein the movement of the door (3) in a main horizontal plane (P) of the aircraft (1) is controlled by coupling between the door (3) and the frame (4) on a control ramp (7) and on two slide guides (8, 9), front (AV) and rear (AR), arranged between the door parts (3), respectively front and rear, and the frame (4) coupled to at least one manipulation arm (5, 6) articulated in rotation on a front side (AV) of the frame (4) and to the door (3) via a forearm (5b, 6b).

5. The aircraft as claimed in claim 4, wherein the control ramp (7) and the guides (8, 9) each comprise a slide (7a, 8a, 9a) associated with a circulation roller (7b, 8b, 9b) in the slide (7a, 8a, 9a), the slides (8a, 9a) of the guide (8, 9) being open at one end (8c, 9c).

6. The aircraft (1) as claimed in claim 5, wherein the slides (7a, 8a, 9a) are fixed to the frame (4) and the rollers (7b, 8b, 9b) are integral with the door (3).

7. The aircraft (1) as claimed in claim 5, wherein the slides (7a, 8a, 9a) are fixed to the door (3), and the rollers (7b, 8b, 9b) are integral with the frame (4).

8. The aircraft (1) as claimed in claim 4, wherein the control ramp (7) is arranged in the front (AV) and upper part of the door (3), and the front (AV) and rear (AR) guides (8, 9) are respectively arranged in the lower front part of the door and in the upper rear part of the door (3).

9. The aircraft as claimed in claim 4, wherein return devices (5a, 6a) between the arm (5, 6) and the forearm (5b, 6b) adapt in extension the position of the forearm (5b, 6b) relative to the arm (5, 6).

10. The aircraft (1) as claimed in claim 4, wherein the control ramp (70) and one of the guides (80) are arranged between the arm (5, 6) and the door (3).

11. The aircraft (1) as claimed in claim 10, wherein the rollers (7b, 8b) are aligned on one and the same axis (Y′Y) that is integral with the arm (5, 6).

12. The aircraft (1) as claimed in claim 4, wherein the opening/closing mechanism comprises two arms (5, 6) and two forearms (5b, 6b), each arm (5, 6) being coupled to a forearm arm (5b, 6b).

Description

PRESENTATION OF THE FIGURES

[0029] Other information, features and advantages of the present invention will become apparent upon reading the following non-limited description, with reference to the appended figures which show, respectively:

[0030] FIG. 1, a transparent face-on view of an example of a door opening/closing mechanism according to the invention in the closed position, with two front and rear guides, respectively in the low and high position of the door, and a control ramp in the high front door position;

[0031] FIGS. 2a to 2d, a transparent view from above of the door in an opening movement according to the invention;

[0032] FIG. 3, a transparent perspective face-on view of the door in the open position;

[0033] FIG. 4, a transparent view of the control ramp of the mechanism of FIG. 1;

[0034] FIG. 5, a perspective view of a front guide and an alternative control ramp positioned at the level of the arm in another exemplary embodiment of the door opening/closing mechanism; and

[0035] FIGS. 6a to 6d, a transparent schematic view from above of the kinematics of the door in the opening movement in the other exemplary embodiment.

DETAILED DESCRIPTION

[0036] The transparent diagram of FIG. 1 shows an inside part of an aircraft 1 with the internal face 2i of the fuselage 2 and the internal face 3i of the door 3 arranged in the fuselage frame 4 in the closed position. The longitudinal axis X′X indicates the normal direction of advance of the aircraft 1, and defines a front AV and rear AR part of the door 3. The frame 4 has several stops for reacting the pressurization forces, called retaining stops 11 (eight stops in this exemplary embodiment) serving to keep the door 3 in place in its frame 4. This door 3 also has several fixed retaining stops 12 (eight stops in this exemplary embodiment) resting on the stops 11 of the frame 4, a window 3a, and two articulation arms, a handling arm 5 and a connecting rod 6 in the example. These arms 5, 6 are mounted on an articulated connection 20 to the front side of the frame 4 in order to drive the door 3 in motion on the frame 4.

[0037] Each arm 5, 6 is coupled to a forearm 5b, 6b mounted on the door 3 via a spring 5a, 6a, fixed at the end to the respective arms 5, 6 and forearms 5b, 6b in this embodiment. The springs 5a and 6a are return means making it possible to maintain, when opening the door 3, a position of the forearms 5b and 6b relative to the arms 5 and 6 in the form of a parallelogram, the movement of these arms 5, 6 and forearms 5b, 6b in a parallelogram allowing the door 3 to remain parallel to the fuselage 2.

[0038] In order to guide the movement for releasing the stops of the door 3, a control ramp 7 comprises a slide 7a fixed on the frame 4, associated with a running roller 7b fixed on the door 3. A rear guide 8 and a front guide 9 also contribute to the movement of the door 3 according to the invention, and each comprise a slide 8a (respectively 9a) fixed on the frame 4, and a running roller 8b (respectively 9b) fixed on the door 3. The slides 8a and 9a are open at their front ends 8c and 9c.

[0039] The kinematics of opening/closing of the door 3 relative to the fuselage 2 is imparted to the door 3 from the frame 4 in a main horizontal plane “P” of the aircraft 1 by the two arms 5, 6 and the forearms 5b, 6b, and are controlled, in a reversible manner, by the two guides 8 and 9 between a closed position in abutment in the frame 4, and an open position outside the frame 4 with the inside face of the door 3 against the outer fuselage 2.

[0040] FIGS. 2a to 2d show more precisely a transparent view from above of the opening kinematics of a door 3 according to the invention. Each of these FIGS. 2a to 2d shows the two arms 5 and 6, their two forearms 5b and 6b, as well as the guides 8, 9 with their slides 8a, 9a in which the running rollers 8b, 9b move. From FIG. 2a to FIG. 2d, it can be observed that the movement of opening the door 3 is guided by the shape of the slides 8a, 9a that are integral with the fuselage 2, which drives the running rollers 8b, 9b, integral with the door, in their slides 8a, 9a.

[0041] To start with, FIG. 2a shows the general operation of the opening. The door opening control ramp 7 guides the door 3 in positions of pushing towards the front AV and towards the rear AR of the aircraft 2. In addition, the springs 5a and 6a adapt the position of the arms 5 and 6 relative to the door 3 by extension or contraction of these springs 5a and 6a. The slides 8a and 9a respectively have an “S” shape and a “hairpin” shape.

[0042] In FIG. 2b, it appears that this control ramp 7 generates a first displacement of the door towards the rear AR and towards the inside of the aircraft 2 which follows the shape of the curves of the slides 8a, 9a via the rollers 8b, 9b. A combination of movements of the front AV and rear AR parts of the door 3 by rotation and translation releases the door stops 12 from the stops 11 of the fuselage 23 and brings the door 3 in translation T1 towards the rear AR.

[0043] Then the opening of the door 3 continues, with reference to FIG. 2c, with control of movement of the door 3 towards the front AV, which causes its front part to rotate towards the outside EXT, imparted by the rollers 8b and 9b in the rear guide 8 and front guide 9, generally in an inclined translation T2. The front part of the door 3 and its front stops 12 are then released from the frame 4 to the outside EXT of the aircraft fuselage 2.

[0044] The kinematics continues, as illustrated in FIG. 2d, by the arms 5 and 6 which, in articulation with the forearms 5b, 6b towards the rear AR, give rise to a rotation of the rear part AR of the door 3 and towards the outside EXT, as well as initiation of translation of the door 3 towards the front AV parallel to the fuselage 2, the rear and front door stops 12 then being out of the frame 4. The rear roller 8b is out of its slide 8a and the front roller 9b remains in a position close to the outlet of the slide 9a.

[0045] FIG. 3, which shows a transparent, face-on view of the door 3 at the end of the opening movement, shows the completion of the rotation of the arms 5 and 6 around the articulated connection 20 on the front AV side of the frame 4. This rotation has driven the door 3 towards the front AV and towards the illustrated final open position, in which its inside face 3i is disposed facing the outside of the fuselage 2e.

[0046] In this final position, the springs 5a and 6a (see FIG. 1) keep the door 3 in a stable open position. The running rollers 8b and 9b, fixed on the door 3, are out of their slides 8a and 9a which remain fixed on the frame 4. The arms 5, 6 and forearms 5b, 6b are arranged against the door 3 without extension of the return springs, as in the initial reference position of the door 3 by the force generated by the return springs in extension.

[0047] FIG. 4 illustrates a transparent view of the control ramp 7 implemented in the example described above, comprising a slide 7a fixed on the frame 4, and a running roller 7b fixed on the door 3. This control 7 guides the opening/closing movement of the door 3 towards the front AV or towards the rear AR by moving the roller 7b into one or the other of the stop positions B1 and B2.

[0048] And FIG. 5 shows in transparency a perspective view of the control ramp 70 and of the front guide 80 of another example of a door opening/closing mechanism according to the invention. In this example, the “C”-shaped front guide 80 and the control ramp 70 are positioned between a handling arm 5 and the door 3 (see FIG. 1). The slides 71 and 81 of the ramp 70 and of the front guide 80 are mounted on the arm 5, while the rollers 7b and 8b are fixed co-axially on the door 3 along an axis Y′Y. This example therefore makes it possible to simplify the coordination between the control ramp 70 and the front guide 80, and to dispense with the presence of springs.

[0049] FIGS. 6a to 6d show more precisely, in transparent and schematic views from above, the opening kinematics of the door 3 implemented by the opening mechanism incorporating the control ramp 70 and the front guide 80 of FIG. 5. Each of these FIGS. 6a to 6d schematically shows the two arms 5 and 6, their two forearms 5b and 6b, as well as the slide 81 associated with the running roller 8b of the front guide 80.

[0050] FIG. 6a to FIG. 6d show that the kinematics of opening the door 3 is controlled by the “C” shape of the slide 81 integral with the arm 5, while the roller 8b moves from one end 8c to the other 8d in the slide 81.

[0051] In the door closed position (FIG. 6a), the roller 8b is at the end 8c of the slide 81, the arms 5, 6 and their forearms 5a, 6a are in the reference position.

[0052] In FIGS. 6b and 6c, the roller 8b is in intermediate positions between the ends 8c and 8d of the slide 81. The door 3 tilts in rotation so that the front part moves towards the front AV and the outside EXT of the fuselage 2 to the rear of the door 3 and towards the rear AR according to the movement M1 to release the door stops 12 from the frame stops 11 (see FIG. 1), and according to a movement M2 while continuing to tilt in rotation. The forearms 5b, 6b pass from a position tilted towards the front AV (FIG. 6b) to a position tilted towards the rear AR (FIG. 6c), by their articulation on the corresponding arms 5, 6 via the return springs 5a, 6a (see FIG. 1).

[0053] In FIG. 6d, the roller 81 arrives at the end position 8d of the slide 81 and the door 3 has tilted in reverse rotation with respect to that of FIG. 6a, so that the rear part of the door 3 also advances towards the outside EXT of the fuselage 2: the door 3 is then out of its frame 4, parallel to the fuselage 2. The final phase of opening the door 3 is identical to that of the previous example as illustrated in FIG. 3.

[0054] The invention is not limited to the exemplary embodiments described and depicted. Thus, the arms can be moved by an electric control. The position of the guides is not fixed. Independently of one another, the slides can be placed on the frame in high or low, front or rear positions, or out of the frame at the level of the front arm for one of the two slides. Likewise, the position of the control ramp can be arranged in a high or low, front or rear position, or even at the level of the arm.

[0055] Furthermore, the slides can be fixed on the door and the running rollers on the fuselage.