External anchoring harpoon for aircraft
An external anchoring harpoon for an aircraft in order to anchor the aircraft on an anchor grid of a platform, the external anchoring harpoon comprises a frame connected to the aircraft, a harpoon head, and a deployment device for deploying the harpoon head. The deployment device comprises a cable, a movement device for moving the cable connected to the frame, the cable being connected to the harpoon head and to the movement device. The deployment device also comprises a main telescopic strut and two secondary telescopic struts so as to enable the harpoon head to be centered under the aircraft and so as to enable the harpoon head to be anchored to the anchor grid.
1. An external anchoring harpoon for an aircraft for co-operating with an anchor grid of a platform in order both to make landing of the aircraft on the platform safe and also to hold the aircraft down on the platform, the external anchoring harpoon being external to the structure of the aircraft and comprising:
a frame configured to be connected to the aircraft;
a harpoon head configured to become anchored in the anchor grid; and
a deployment device for deploying the harpoon head;
wherein the deployment device comprises:
flexible connection means having a first end and a second end and connected via the first end to the harpoon head;
a movement device for moving the flexible connection means and connected firstly to the frame and secondly to the second end of the flexible connection means;
a main telescopic strut provided with a third end and a fourth end, and connected via the third end to the harpoon head and via the fourth end to the frame; and
at least one secondary telescopic strut provided with a fifth end and a sixth end and connected via the fifth end to the harpoon head and configured to be connected via the sixth end to the aircraft.
2. The external anchoring harpoon according to claim 1 , wherein the frame is configured to be connected to the aircraft by one or more rigid end-restraint type connections.
3. The external anchoring harpoon according to claim 1 , wherein the frame is configured to be connected to the aircraft by at least two pivot connections.
4. The external anchoring harpoon according to claim 1 , wherein the movement device comprises a winder device for winding the flexible connection means.
5. The external anchoring harpoon according to claim 1 , wherein the movement device comprises an actuator.
6. The external anchoring harpoon according to claim 1 , wherein the deployment device comprises an angle-changer device connected to the frame and serving to guide the flexible connection means while it is moving, the angle-changer device being arranged between the movement device and the harpoon head so as to change the direction of the flexible connection means between the movement device and the harpoon head.
7. The external anchoring harpoon according to claim 6 , wherein the angle-changer device comprises a sheave connected to the frame by at least one pivot connection.
8. The external anchoring harpoon according to claim 1 , wherein the main telescopic strut has a first tube and a second tube capable of sliding relative to each other along a slideway connection, together with two first resilient means, the first resilient means being opposing resilient means, the first tube being connected to the harpoon head via a rigid end-restraint type connection and the second tube being connected to the frame via a ball-joint connection, each secondary telescopic strut having a third tube and a fourth tube capable of sliding relative to each other, the third tube being connected to the harpoon head via a ball-joint connection and the fourth tube being configured to be connected to the aircraft by a ball-joint connection.
9. The external anchoring harpoon according to claim 8 , wherein the main telescopic strut is of elongate shape along an elongation axis, and the deployment device includes a control rod configured to be arranged between the second tube and the aircraft in order to constrain the main telescopic strut together with the aircraft in rotation about the elongation axis.
10. The external anchoring harpoon according to claim 1 , wherein the deployment device comprises a single secondary telescopic strut having two second resilient means, the second resilient means being opposing resilient means.
11. The external anchoring harpoon according to claim 1 , wherein the deployment device comprises two secondary telescopic struts arranged on either side of the harpoon head and each comprising a single second resilient means such that the second resilient means of the two secondary struts act in opposition.
12. The external anchoring harpoon according to claim 1 , wherein the deployment device comprises a tensioning scissors linkage arranged between the harpoon head and the frame, the tensioning scissors linkage being provided with a pantograph and at least one third resilient means for tensioning the flexible connection means and simultaneously exerting a substantially vertical force on the harpoon head.
13. The external anchoring harpoon according to claim 1 , wherein the external anchoring harpoon includes a locking device for locking the anchoring of the harpoon head on the anchor grid, the locking device including control means independent of the deployment device.
14. An aircraft, wherein the aircraft includes the external anchoring harpoon according to claim 1 .
15. The aircraft according to claim 14 , wherein the aircraft has a fuselage and structural elements, and the frame of the external anchoring harpoon and each secondary telescopic strut are connected to respective ones of the structural elements under the fuselage.
16. The aircraft according to claim 14 , wherein the movement device for moving the flexible connection means comprises an actuator arranged under the fuselage.