FR2462335A1 - LARGABLE AIRBORNE BUOY - Google Patents

Abstract

LARGEABLE BUOY OF AN AIRCRAFT IN THE WATER CONTAINING A LOAD 15 WHICH SINKS AFTER IMPACT ON WATER. THE LOWER PART OF THE BUOY INCLUDES A NON-DEFORMABLE PART 1 INCLUDING RECESSES AND BEEN BASED ON THE BODY OF THE BUOY 6 AND A DEFORMABLE PART 3, INCLUDING TWO TABS, PART OF THE TONGS BEING BELOW THE HOLLOWING OF THE PART NON-DEFORMABLE 3, A PART 12 LENGHING ON THIS PART AND THE ENDS OF THE TABS RETURNING INTO LIGHTS 5 OF THE BODY OF THE BUOY 6. ON THE EFFECT OF THE IMPACT ON THE WATER, THE TONGS DEFORMING EXIT FROM THE LIGHTS 5 RELEASING ROOMS 1 AND 3 AS WELL AS THE LOAD 15. APPLICATION TO SOUND MUD RADIO.

Description

The present invention relates to buoys so-nt

  dropped from an aircraft and, more specifically, to radio-controlled

  which are intended once for water, to transmit radio-

  electrically various underwater parameters and information, detected by acoustic receivers. These radiobouées generally include a float equipped with an antenna and a hydrophone which, attached to the float, goes down to a certain depth to detect acoustic noises. The electrical signals of the hydrophone are processed and applied to the antenna

radio.

  The hydrophone is attached to the float by a cable providing suspension and electrical connections. This cable is usually wrapped around a coil placed in the lower part of the buoy with the hydrophone. After the buoy arrives on the water, the hydrophone and its cable reel must detach from the float to descend to the determined depth

  by the length of the cable that ran completely.

  It is known to lock the lower part of the buoy in its upper part through a spring system. The impact force when the buoy arrives on the water causes the

  unlocking the lower part, which falls.

  This device has the disadvantage that the mechanism of unlocking

  rusting is only effective during the very short time of

loosely spring.

  To remedy this drawback the device according to the invention comprises an unlocking of the lower part thanks to a blade, which deforms permanently.Brieusement, it is an airborne buoy releasable in the water, comprising

  a charge released under the effect of the impact on water by

  rusting of the lower part or bottom of the buoy,

  characterized in that the bottom comprises a non-deformable part and a deformable part, that the non-deformable piece has at least one recess and an edge which bears against the body of the buoy; the deformable part being a flat plate having two tongues;

  a first part of the tongues is found in a sketch of an

  of the non-deformable part, another part leans on the edge of this piece and a last part at the end, enters

  in a light from the body of the buoy.

  Other benefits and features will emerge from the

  description given as an example and illustrated by the figures

  which represent: - Figure 1, a cross sectional view of the release mechanism of the lower part of the buoy according to the invention; - Figure 2, a top view of this mechanism; - Figure 3, a transverse view of this mechanism after the impact on the water; - Figure 4, a transverse view of this mechanism after impact on water, according to a variant of the invention. The lower part or bottom of the buoy is shown respectively in cross section and in plan view on the

  Figures 1 and 2, the buoy being for example cylindrical.

  The bottom consists of two pieces 1 and 3; under the action of the impact force received during the arrival of the buoy on the water, the piece 1 is dimensionally stable while the piece 3 is deformable and the combined action of these two parts allows the release of the load 15 consisting for example of the hydrophone

and the cable reel.

  The piece 1 comprises at least one recess, into which the blade 3 will enter at the time of its deformation, it further comprises an edge 12 which bears inwardly on a shoulder 13 of the wall of the body of the buoy 6, while the piece 3 consists of a flat plate closing the mevidement of the

  piece 1 and having two tabs 2 diametrically oppo-

  which are in contact with the edge 12 over part of their length only, via notches 4 provided for this purpose. Towards the inside of the buoy a portion 14 of each tongue is not in contact with the edge 12 of the blade 1; towards the outside of the buoy the end of each tongue is engaged in a hole 5 made in the body of the buoy 6. The load 15, for example the hydrophone and the coil of

  cable, rests on the back of the piece 1.

  Moreover, the piece 1 can be advantageously provided with a stop forming an anvil 8 placed asymmetrically towards

  the edge of the piece 1 as shown in Figure 1.

  During the impact on the water the plate 3 is subjected to the impact force directed upwards due to the kinetic energy that the buoy has at this moment. These buoys being for example

  thrown, the speed at which they arrive at the

  face of the water is of the order of a few tens of meters per second providing an impact force of the order of a thousand

Newtons.

  Under the effect of this force received by the plate 3, the two tongues 2 slide towards the center in the notches 4 and fold on the one hand at the points 9 of least resistance and on the other hand at the edges 10 of the piece 1 retained by the body of the buoy through the shoulder 13

  Account. given the impact force generally achieved, the geo-

  metry of the plate 3 ', its thickness and the material that compose it are chosen to obtain a sufficient amplitude of the fold so that the ends of the tongues 2 come out of the two lumens 5, the height H of the recess of the piece 1 being sufficient to ensure permanent deformation of the plate 3 .. The load is released while the piece 1 and the

plate 3 sink.

  According to a preferred embodiment of the invention, the piece 1 is provided with a stop 8 placed asymmetrically towards the edge

  of the piece 1, of height equal to the depth of the recess.

  The edge 11 of the abutment 8 bears on the plate 3, on a

  length L, so that the plate 3 deforms asymmetrically.

  At the time of impact on the water, the plate 3 is pressed strongly on the abutment 8 along the edge 11. The tongue 2 adjacent the abutment remains substantially in place while the other tongue undergoes two bends more accentuated than in the previous embodiment and therefore the removal of the tongue out of the light 5 is more frank. In addition, just after the effect of the impact force, the plate 3 retains some elasticity at the edge 11 effecting

  spring and thereby contributing to his release.

  The most deformed end comes out of the light 5 and the plate 3 is released by pivoting around the other end, which in turn comes out of the light 5

RE SELL I CAT I O NS

  1. Airborne buoy releasable in water, with a

  load released under the effect of the impact on the water by unlocking

  the lower part or bottom of the buoy, characterized in that the bottom comprises a non-deformable part (1) and a deformable part (3), that the non-deformable part (1) has at least one recess and an edge which rests on the body (6) of the buoy; the deformable part (3) being a flat plate comprising two tongues (2); a first part of the tongues (2) is below a recess of the nondeformable part (1), another part rests on the edge of this piece (1) and a last part at the end, enters in a light (5)

body of the buoy (6).

  Buoy according to claim 1, characterized -

  in that the non-deformable part (1) comprises a stop (8) of height equal to the depth of the recesses, this stop

  being in contact with the deformable part (3).

  3. Buoy according to claim 2 characterized in that the thickness and the mechanical properties of the blade (3) are such that the impact on the water deforms at least one tongue following two folds, allowing the proper release of the load by removal of the tabs (2) of the lights (5) in the

body of the buoy (6).

  Buoy according to Claim 1, characterized in that the non-deformable part (1) has only one recess and that the deformation by the impact on the water produces a deformation of the blade (3), causing the withdrawal of both

  tabs (2) lights (5) in the body of the buoy (6).

  Buoy according to claims 2 and 3, characterized

  characterized in that the thickness and the mechanical properties of the deformable blade (3) are such that a single tongue is

  deforms after the impact on the water and that the stop

  ticity, removal of undistorted tongue from light (5)

  corresponding, after the deformed tongue has been released.