Anti-landing device for rotary-wing aircraft

Abstract

The invention relates to an anti-landing device (1) for a rotary wing aircraft comprising: - a support for attachment to a frame; - a mast (2) attached to the support and intended to extend vertically to prevent the rotation of the blades of the aircraft; According to the invention, the attachment support comprises a plate (3) intended to be attached vertically to the frame, the mast (2) having at its lower part attachment elements (7) intended to be attached to the plate (3), a lower end of the mast (2) being connected in an articulated manner to a lower end of the plate (3) to move from an assembly / disassembly position in which the mast (2) is in a substantially horizontal position, to an active position in which the mast (2) is in a vertical position and the attachment elements (7) are attached to the plate (3). Figure for abstract: Fig. 1

Description

Title of the invention: Anti-landing device for rotary-wing aircraft Technical field

[0001] The invention relates to the technical field of anti-landing devices for rotary-wing aircraft, such as for example helicopters. Prior art

[0002] Document FR2843417 is known from the prior art, which describes a helicopter anti-landing device comprising a mast formed by the superposition of tubular modules, at the lower end of which a base is fixed.

[0003] The base is in the form of a circular plate provided with holes for anchoring it in a foundation element.

[0004] This device is entirely satisfactory in that it is a question of prohibiting the landing of a rotary-wing aircraft, but its implementation is complex and requires a foundation element for its anchoring to the ground, and the ground anchoring operation as such.

[0005] It also follows that, once the device is installed, its removal also becomes complex. Statement of the invention

[0006] One of the aims of the invention is to overcome the drawbacks of the prior art by proposing an anti-landing device for a rotary-wing aircraft, which is of simple, safe and rational design, while being versatile, and easy to install and remove.

[0007] For this purpose, an anti-landing device for a rotary-wing aircraft has been developed, comprising: - a support for fixing to a frame; - a mast fixed to the support and intended to extend vertically to obstruct the rotation of the aircraft blades.

[0008] According to the invention, the fixing support comprises a plate intended to be fixed vertically to the frame, the mast having at its lower part fixing elements intended to be fixed to the plate, and a lower end of the mast is connected in an articulated manner to a lower end of the plate to pass from a mounting / dismounting position in which the mast is in a substantially horizontal position, to an active position in which the mast is in a vertical position and the fixing elements are fixed to the plate.

[0009] In this way, the installation is simplified, the fixing plate is fixed vertically on a frame, which can be a vertical wall for example, and the mast is fixed in the lower part to the plate by being placed on the ground, then is articulated to be passed and fixed in the active position in which it opposes the landing of the aircraft.

[0010] According to a preferred embodiment, the plate comprises receiving elements to which the mast fixing elements are intended to be fixed.

[0011] This configuration makes it possible to further secure the active position of the mast with the support plate, to avoid any disassembly of the mast with the plate.

[0012] Preferably, the receiving elements are in the form of at least one strip of sheet metal having a central portion welded to the plate, perpendicular to the mast, and end portions folded twice at right angles to form a bearing surface for the mast fixing elements.

[0013] Thus, the receiving elements are made in a simple manner, while ensuring support surfaces with the mast fixing elements, for more secure fixing.

[0014] Preferably, the mast is articulated by means of a yoke fixed to the plate and comprising two wings, located on either side of the lower end of the mast, and a pin passing through the wings and the mast.

[0015] In this way, the articulation of the mast with the plate is simple to implement, while ensuring safety of the articulation.

[0016] According to a preferred embodiment, the yoke is in two parts, each of the parts being made of an L-shaped support sheet, in order to further facilitate the production of the articulation.

[0017] Preferably, the L-shaped support sheets have one end provided with a tab intended to engage in a complementary slot provided in the plate, in order to reinforce the connection between the sheet metal portions and the plate.

[0018] Preferably, the mast fixing elements are in the form of at least one plate welded orthogonally to the mast with a free end folded at a right angle to be fixed against the plate. Even more preferably, several plates are welded along the mast.

[0019] In this way, the assembly of the mast is simple and quick.

[0020] The plate includes holes for its fixing, for example: - in a concrete frame with dowels, or - to a counter-plate with threaded rods and nuts, on either side of a frame in the form of a vertical beam.

[0021] In order to add a deterrent effect for the pilot to land in the protected area, rods, for example made of composite material, are preferably fixed to a free end of the mast, around the circumference of the mast extending in a radial direction and inclined upwards. Brief description of the drawings

[0022] [Fig.l] is a perspective view of an anti-landing device of an aircraft according to the invention, provided with its support.

[0023] [Fig.2] is a perspective view similar to [Fig.l], from another point of view.

[0024] [Fig.3] is a perspective view similar to [Fig.l], from a rear viewpoint.

[0025] [Fig.4] is a perspective view of an anti-landing device of an aircraft according to another embodiment.

[0026] [Fig.5] is a perspective view similar to [Fig.4], from another point of view. Detailed description of the invention

[0027] With reference to Figures 1 to 5, the present invention relates to an anti-landing device (1) for a rotary volume aircraft of the helicopter type according to the invention.

[0028] The anti-landing device (1) is in the form of a mast (2), shown partially, as well as a support for attachment to a frame. The mast (2) of the anti-landing device (1) comprises, for example, conventionally at an upper free end, rods, not shown, which are fixed around the circumference of the mast (2), and which extend in an upwardly inclined radial direction, for example with a length of between 30 and 50 centimeters, and acting as a deterrent for the pilot of the aircraft. These rods are, for example, made of composite materials.

[0029] According to the invention, and still with reference to Figures 1 to 5, the fixing support of the device (1) comprises a plate (3), in the form of a metal plate, for example made of steel with a thickness of between 10 and 15 mm, for example 12 mm, which is fixed vertically to a vertical surface of a frame, such as a portion of wall for example. To do this, the plate (3) is provided with holes to allow the arrangement of fixing means to the frame, such as anchoring pins.

[0030] The plate (3) is integral with several receiving elements (4) in the form of receiving sheets having a central portion (5) welded to the plate (3), and end portions (6) folded twice at right angles so as to form support surfaces.

[0031] The lower part of the mast (2) is integral with a plurality of fixing elements (7), which are in the form of fixing sheets having a free end bent at a right angle (8). These fixing sheets, which in practice are welded to the mast (2), have a semi-circular cutout (9) to receive the mast (2). The welding between the mast and the sheet is carried out along this semi-circular cutout. The ends bent at a right angle (8) of the fixing sheets are intended to be screwed to the bearing surfaces of the receiving sheets, in particular by bolts with non-loosenable nuts.

[0032] The plate (3) is also secured to a yoke in the form of two sheets of L-shaped support (10), each provided with a tab (11) intended to engage in a complementary slot (12) made in the plate (3). The yoke is preferably welded to the plate.

[0033] In practice, the support plates (10) each comprise an orifice provided in their wall, so as to allow the insertion of a pin or a rod with nut, and so as to be secured to the lower end of the mast (2). The mast (2) also comprises two orifices provided in its wall, so that the pin passes through both the orifices of the support plates (10) and the orifices provided in the mast (2), in order to obtain a pivot joint (13).

[0034] Thus, in a so-called “assembly / disassembly” position, the mast can be in a horizontal position and the lower end of the mast (2) is easily fixed to the L-shaped support sheets (10), and then, by a rotational movement of the mast (2), the latter adopts a so-called “active” position, in which the fixing sheets (7) are in abutment against the receiving sheets (4) with a view to their being joined in an asian manner.

[0035] According to a first embodiment, shown in Figures 1 to 3, the plate (3) is fixed to a frame which may be in the form of a portion of concrete wall. According to this first embodiment, the plate (3) is fixed to the concrete wall with dowels (14) or any other fixing system, without departing from the scope of the invention.

[0036] According to a second embodiment, shown in Figures 4 and 5, the plate (3) is fixed to a frame in the form of a vertical beam. In this embodiment, the plate (3) is secured to a counter-plate (15) by means of threaded rods (16) and nuts (17), making it possible to secure the two plates so as to clamp the vertical beam between them.

[0037] In this second embodiment, the counter-plate (15) is for example provided with support tabs (18) making it possible to laterally border the beam, to facilitate assembly and to improve the stability of the support.

[0038]

[0039] It is clear from the above that the invention provides a versatile anti-landing device (1) for a rotary-wing aircraft, while ensuring simplified and safe installation.

Claims

Claims

1. Anti-landing device (1) for a rotary wing aircraft comprising: - a support for attachment to a frame; - a mast (2) attached to the support and intended to extend vertically to prevent the rotation of the blades of the aircraft; characterized in that the attachment support comprises a plate (3) intended to be attached vertically to the frame, the mast (2) having at its lower part attachment elements (7) intended to be attached to the plate (3), a lower end of the mast (2) being connected in an articulated manner to a lower end of the plate (3) to move from a mounting / dismounting position in which the mast (2) is in a substantially horizontal position, to an active position in which the mast (2) is in a vertical position and the attachment elements (7) are attached to the plate (3).

2. Device (1) according to claim 1, characterized in that the plate (3) comprises receiving elements (4) to which the fixing elements (7) of the mast (2) are intended to be fixed.

3. Device (1) according to claim 2, characterized in that the receiving elements (4) are in the form of at least one strip of sheet metal having a central portion welded to the plate (3), perpendicular to the mast (2), and end portions folded twice at right angles to form a support surface for the fixing elements (7) of the mast (2).

4. Device (1) according to one of the preceding claims, characterized in that the mast (2) is articulated by means of a yoke fixed to the plate and comprising two wings, located on either side of the lower end of the mast (2), and a pin passing through the wings and the mast (2).

5. Device (1) according to claim 4, characterized in that the yoke is in two parts, each of the parts being made of an L-shaped support sheet (10).

6. Device (1) according to claim 5, characterized in that the L-shaped support sheets (10) have one end provided with a tongue (11) intended to engage in a complementary slot (12) formed in the plate (3).

7. Device (1) according to one of the preceding claims, characterized in that the fixing elements (7) of the mast (2) are presented under the

8. form of at least one plate welded orthogonally to the mast (2) with a free end folded at a right angle (8) to be fixed against the plate (3). Device (1) according to one of the preceding claims, characterized in that the plate (3) comprises orifices for its fixing: - in a concrete frame with dowels (14), or - to a counter-plate (15) with threaded rods (16) and nuts (17), on either side of a frame in the form of a vertical beam.

Images