FR2537265A1 - AN ANNULAR LOCKING DEVICE SAFETY DEVICE FOR GYRATORY PROJECTILE - Google Patents

Abstract

1. Safety device for a spinning projectile, which possesses, inside the body (1) of the projectile having a specific spin axis (25), a member (4) movable between two positions relative to the body (1) and locking means comprising : a finger (8) mounted slidably in the body (1) along the spin axis (25) of the latter and interacting with the movable member (4) to immobilize the latter relative to the body (1) in a first of the said positions or to release this member (4) in respect of a movement towards its second position, a latch (13) at least partially in the form of a sleeve, arranged round an axial shaft (15) of the body (1), the said latch (13) being designed to open under the action of centrifugal force beyond a value of the spinning speed below the maximum value of the latter, at least one elastic spiral band (14) having such a mass, form, rigidity and prestress that it is wound round the latch (13) and grips it soas to be connected frictionally to it, when at rest, characterized in that : in a specific direction (27) parallel to the spin axis (25), the finger (8) abuts against a counterpart (12) of the body (1) via a central zone of a washer (11) centred on the spin axis (25) and having an outer periphery (47) projecting relative to the counterpart (12), the latch (13) is freely rotatable about the spin axis (25) relative to the body (1) and, with an axial play compatible with this relative freedom of rotation, in the said specific direction (27) abuts against a zone (10) of the finger (8) and in the opposite direction against a central zone (48) of a bearing face (21) of the body (1) having a concavity centred on the spin axis (25), so that the latch (13) ensures bracing between the said central zone (48) of this bearing face (21) and this zone (10) of the finger (8), itself abutting against the counterpart (12) of the body (1) via the central zone of the washer (11), the form of the said bearing face (21) of the body (1) being such that a centrifugal opening of the latch (13) causes, because the latch (13) bears respectively against a peripheral zone of the washer (11) and against the face (21), a displacement of this peripheral zone (47) of the washer (11) relative to the counterpart (12) in the specific direction (27), thus causing as a result of a lever effect a movement of the finger (8) relative to the body (1) in the opposite direction, the mass, form, rigidity and prestress of the elastic spiral band (14) are also such that it remains wound round the latch (13) and grips it so as to be connected frictionally to it, as long as the latter, becoming fast to the body (1) as a result of inertia during the acceleration of the projectile in the firing tube, undergoes joint spinning with the body (1) at a speed increasing from zero to the said maximum value, and that its outer turn tends to come loose under the action of the centrifugal force at a value slightly below or equal to this maximum value, lay itself against an inner peripheral face (23) of the body (1) and become connected frictionally to the latter, in such a way that, when the projectile emerges from the firing tube, there occurs a centrifugal unwinding of the elastic spiral band (14), with the release of the latch (13) in respect of its centrifugal opening, followed by the centrifugal opening.

Description

2537 '265

  The present invention relates to a safety device

  with annular locking member S for a gyratory projectile.

  Such projectiles are generally equipped with pyrotechnic rockets for their firing and, to prevent such firing occurs inadvertently, there is provided inside the body of the projectile a movable member such as a shutter or a gyroscopic rotor adapted to occupy a position in which it interrupts the continuity of the pyrotechnic chain, position in which it is locked during storage, feeding in the weapon, the path in the gun barrel when firing , and during the first meters of the trajectory of the projectile out of this tube, and a position in which this continuity is established, position that the movable member tends to gain automatically for example under the action of the centrifugal force as soon as it is unlocked, after the course, out of the barrel tube, from a distance sufficient to ensure the

security of the gunmen.

  For this purpose, we have already proposed many types of locking means, using watchdog timers, ball ejection mechanisms, fluid dampers, spiral bands, etc., acting directly or indirectly on the percussion device; French patents Nos. 74 19921 and 75 36126 and the patent

US 3,076,410.

  These known safety devices are often complex and particularly difficult to implement, the main difficulty being to overcome and limit the friction forces, obstacle to their proper operation; their reliability is by

  therefore linked to a high manufacturing cost.

  The object of the present invention is to provide a safety device for gyratory rounds which is simple, inexpensive and at least reliable; to this end, the device according to the invention, comprising inside the body of the projectile, having a defined axis of gyration, a movable member between two positions relative to the body and locking means comprising a finger slidably mounted in the body and cooperating with the movable member to immobilize it relative to the body in a first of said positions or release this body vis-à-vis a movement to its second position, is characterized in that the finger is mounted sliding in the body along the axis of gyration thereof and in abutment, in a parallel determined direction

  to the axis of gyration, against a counterpart of the body through

  a center zone of a washer oriented on the axis of gyration and having an outer periphery cantilevered with respect to this counterpart, and in that the locking means ccmportent also: a lock at least partially in the form of a sleeve arranged around an axial shaft of the body relative to which it is free to rotate about the axis of gyration, said latch being in abutment, with an axial clearance ccnpatible with this freedom to the relative rotation, in said determined direction against an area of the finger and in opposite direction against a central zone of a bearing surface of the body having a concavity oriented on the axis of gyration, so that the lock ensures a bridging between this central area of support and this zone of the finger, itself in abutment against the counterpart through the central zone of the washer, said latch being able to open under the action of the centrifugal force beyond a value determined from the speed of gyration, lower than the maximum value of: this and the shape of said bearing surface of the body being such that such centrifugal opening of the lock causes, by bearing thereof respectively against a peripheral zone the flange and against -the corresponding area of the bearing surface of the body, a displacement of this peripheral zone of the flange relative to the counterpart in said determined direction, causing by leverage a movement of the finger relative to the body in the opposite direction, at least one elastic spiral band whose mass,

253? 265

  the shape, the rigidity and the prestress are such that it is wrapped around the lock and encloses it so as to be in solidarity with it

  by friction at rest and as long as it undergoes, in solidarity

  by inertia with the body at the acceleration of the projectile in the weapon tube, a joint gyration with the body at a speed increasing from zero to said maximum value, and that its outer turn tends to disengage under the action of the centrifugal force for a value slightly less than or equal to this maximum value for pressing against an inner peripheral face of the body and frictionally fastening it, so that, at the exit of the projectile from the barrel of the weapon a centrifugal flow of the elastic spiral band occurs with release of the lock from its centrifugal opening,

then this centrifugal opening.

  According to a preferred embodiment of the invention, the body is dimensioned internally so that the lock * releases the periphery of the washer when it reaches the end of the centrifugal stroke, and oette washer is elastic and allows or causes a translation movement of the finger in the opposite direction, causing the locking of the mabile member in the

new position of it.

  it is found that the number of parts used by this device is low, and that these parts do not implement machining operations; it results in both a weak

  cost of the device, and a high reliability of it.

  Other features and advantages of the device

  according to the invention will emerge from the description below,

  relating to a non-restrictive mode of implementation, as well as

  attached drawings which form an integral part of this description.

  FIG. 1 shows a sectional view through a plane including the axis of gyration of the projectile, such as the plane I-I

  FIG. 5, showing the device according to the invention in posi-

  securely locking a gyroscopic rotor interposed in the pyrotechnic chain of the projectile then interramped;

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  FIG. 2 shows an analogous view illustrating an intermediate state of the device during its operation in the direction of unlocking the rotor; FIG. 3 shows an analogous view at the end of the operation of the device, with locking of the rotor again, thus establishing the continuity of the pyrotechnic chain; Figure 4 shows a plan view of the elastic washer of the device; FIG. 5 shows a sectional view along the V-V plane

of Figure 1.

  However, the applications of the security device according to the invention are not limited to this example, and all

  movable member other than a rotor interposed in the pyrotechnic chain

  that a projectile could be locked and then released according

  the speed of gyration of the projectile, by means of a

form to the invention.

  1 has designated a rocket body, essentially revolution about an axis 25 which is its axis of gyration; at one of its ends, the body 1 has a tubular shape and internally defines a cavity 22 open towards the outside in a given direction 27 parallel to the axis of gyration 25 and delimited inside the body 1 by a cylindrical face 23 of revolution

  around the axis 25 and turned towards it and by a face 21 pre-

  also feeling a form of revolution about the axis 25, with respect to which it has a transverse mean orientation; this face 21 is turned in the direction 27 and has a concavity

which will be specified later.

  Inside the cavity 22, the body 1 integrally carries a base 2 itself hollow and internally having a support 6 defining a spherical bearing, -C center C located on the axis of gyration 25, for a rotor spherical 4 also centered at C and which internally has a channel 28 which passes therethrough along an axis 26 and inside which is immobilized a detonator-primer 5; the axis 26 goes through the center C and defines a

  own axis of inertia for rotor 4, including the detonator 5.

: 53? 265

  Downstream of the housing of the rotor 4, if one refers to the direction 27, the support 6 is pierced with a channel 53 disposed along the axis 25 and

  which communicates the housing of the rotor 4 with a pyro relay

  firing technique 3 integral with the base 2 opposite the body 1; likewise, upstream if one refers to the direction 27, the housing of the rotor 4 is put in comumnication with a portion of the cavity 22

  left free by the pellet 2 inside the body 1, by a

  9 that has a wall 29 of the base, flat and oriented perpendicularly

specifically to axis 25.

  The bore 9, cylindrical of revolution about the axis 25,

  crosses the wall 29 from one side to the other and is bordered at its mouth.

  cut inside the part of the cavity 22 which is not occupied by the base 2, by an annular shoulder 12, of revolution about the axis 25 and delimited on the one hand by a flat annular face 30, oriented perpendicular to the axis 25, turned in direction

  opposite of the direction 27 and adjacent to the bore 9 by its periphery

  and on the other hand by a cylindrical face 31 of revolution about the axis 25 with a diameter greater than that of the bore 9; this face 31 is turned in the direction of a distance relative to the axis 25 and connects the outer periphery of the face 30 to a flat face 32, oriented transversely to the axis 25 and rotated in the opposite direction of the direction 27, face 32 which delimits the wall 29 of the base 2 in the opposite direction of direction 27 and is contiguous, by its periphery

  outside, of the inner face 23 of the cavity 22.

  It will be noted that the faces 30 and 32 are thus placed opposite the face 21 of the cavity 22 of the body 1, and at a distance of

  this face 21 in the direction of the axis 25.

  Inside the bore 9 is mounted, sliding along the axis 25, an axial locking finger rotor 4, under

the shape of a socket 8.

  This socket 8 is defined in particular by faces

  peripherals respectively inner 33 and outer 34, cylin-

  gears of revolution around the axis 25 and turned respectively towards it and in the sense of a distance by

_ 5? 265

  report to this one; at its end yaval, if one refers to the direction 27, it is delimited by a flat annular face 35, oriented perpendicularly to the axis 25 and joining the faces 33 and 34; at its upstream end, if one refers to the direction 27, it has integrally a flange 10 oriented transversely to the axis 25 and forming a projection in the direction of a distance vis-à-vis the one with respect to the face 34; This flange 10 is delimited by two planar annular faoes 36 and 37, oriented perpendicularly to the axis 25, respectively facing upstream and downstream if one refers to the direction 27 and adjaentes by their inner peripheries respectively to the face 33 and the face 34, and by an outer circumferential device 38 cylindrical of revolution about the axis 25 with a diameter advantageously close to that of the face 31, this face 38 joining the outer peripheries

respective faces 36 and 37.

  The face 37 is thus placed facing the faoe 30 and the face 36 facing a central zone 48 of the face 21, and the face 34 of the sleeve 8 has a diameter approximately equal to that of the bore 9, to allow a sliding mutual contact ensuring guiding of the sleeve 8 to the translation along the axis 25 relative to the integral assembly formed by the

base 2 and the body 1.

  The dimensions of the bushing 8 parallel to the axis 25, and in particular the distance separating its faces 35 and 37, are such that, when the bushing 8 rests on the face 37 of the flange 10 on the face 30 of the shoulder 12 of the base 2, via a central zone of a washer 11 which will be described in detail later, its downstream end defined by the face 35 penetrates inside the housing of the rotor 4, so as to be able to immobilize inside the support 6 in two positions defined by the engagement of this end of the bushing 8 respectively in two countersinks, respectively 7 and

  24, which complementarily presents the rotor 4.

2,537,665

  The first of these countersinks 7 is of revolution about an axis 39 of the rotor 4, passing through the center C thereof but offset with respect to its own axis of inertia 26 (see FIG.

  3), the second 24 of these counters being revolving

  lution around the axis 26 and constituting a section of the channel 28

containing the primer-detonator 5.

  The engagement of the bushing 8 in the countersink 7 of the rotor corresponds to an initial state of safety locking, illustrated in FIG. 1, in which the own axis of inertia 26 of the rotor 4 is shifted argulably with respect to the axis 25. A gyration of the rocket, that is to say the body 1 and

  of the base 2, around the axis 25 then causes a gyrosco-

  rotor spike 4 then being translated as soon as the rotor 4 is released by disengaging the bushing 8 from the countersink 7, by a progressive alignment of the own axis of inertia 26 of the rotor 4 with the axis turn 25, which places the countersink 24 opposite the bushing 8 along the axis 25 and allows locking again by engagement of the bushing 8 in the countersink 24, cme illustrates it in FIG 31 in this position, the channel 28 of the rotor 5 con sole on the one hand with the channel 53 of the support 6 and on the other hand with the inside of the sleeve 8 and, via it, with a central channel 16, axis 25, that presents

  internally, for guiding a firing pin 17 to the slide

  along the axis 25 notanmrent in the direction 27, a hollow shaft integral with the body 1 inside the cavity 22, which hollow shaft 15 forms a projection in the direction 27 relative to the central zone 48 of the face 21 until penetrating inside the socket 8; in the direction of a distance from the axis 25, the hollow shaft 15 is delimited, inside the cavity 22, by an outer peripheral face 41 cylindrical of revolution about the axis 25 with a diameter less than the diameter of the inner face 33 of the sleeve 8 so as not to hinder the possibility of translation thereof parallel to the axis 25

  by sliding in the bore 9 of the base 4.

  The state illustrated in FIG. 3 thus constitutes a state of arememnt of the device, the pyrotechnic chain including the

  relay 3, the channel 29, the amnoroe 5 placed in the channel 28, the

  inside the socket 8, the channel 16 and the striker 17 that it

  containing being then formed without discontinuity.

  Naturally, the length of the hollow shaft 15 measured parallel to the axis 25 is such that it can not hinder such a movement of the rotor 4; for example, it is delimited downstream, with reference to the direction 27, by a flat annular face 40, oriented perpendicular to the axis 25, located approximately coplanar with the face 22 of the wall 29

of the base 2.

  To delay the passage of the rotor from the initial state illustrated in FIG. 1, to the state illustrated in FIG. 3, temporarily holding the bushing 8 engaged in the countersink 7 g, the shaft 15 bears, through the peripheral face. outdoor 41, a verxou 13

  in the form of a sleeve which surrounds it by an integral peripheral face.

  42, also cylindrical of revolution about the axis 25 with a diameter substantially equal to that of the face 41 so

  to ensure, by sliding mutual contact of the faces 41 and 42, an inde-

  pendulum latch 13 to the rotation about the axis 25 by

  relative to the body 1 when the rocket is at rest.

  The latch 13 is further delimited by an outer peripheral face 43, coaxial with its face 42 and presenting

  a diameter for example close to that of the face 31 of the shoulder

  12 of the base 2, and two end faces 44, 45, annular, planar, oriented perpendicular to the axis 25, the first abuts against the central zone 48 of the face 21 around the hollow shaft 15, and the second is in abutment against the face 36 of the flange 10 of the sleeve 8, itself abuts by its face 37 against the face 30 of the shoulder 12 via the central zone of the spring washer 11 cmme it has been said above, if we refer to the secure lock position

2537 65

  of the rotor 4 shown in Figure 1 o The latch 13 ensures between the sleeve 8 and the face 21 of the body 1 a spacer preventing the sleeve 8 to disengage from

  the countersink 7 of the rotor 4, with an axial clearance compatible with the in-

  dependence of latch 13 and body 1 on rotation around

the axis 25.

  However, as is known per se and as shown in FIG. 5, the latch 13 is weakened for example by striations such as 54 oriented parallel to the axis 25 and has an interruption 55 along a plane including this axis 25, of such that, when it rotates about the axis 25 at an angular velocity exceeding a predetermined value lower than the maximum rate of turn of the body 1, the centrifugal force which it undergoes then causes its opening, by sectioning or preferably folding along the lines of greater fragility defined by the streaks 59, resulting in its centrifugal migration by homothetic deformation and the removal of the bracing of the flange 10 of the sleeve 8 vis-à-vis

  of the face 21 of the body 1, that is to say the appearance of a possibi-

  sliding direction of the sleeve 8 in the direction opposite to the direction 27 in the bore 9 of the base 2, that is to say of release of the rotor 4 in the direction of alignment of its axis 26 with the axis of 25. To prevent accidental opening of the latch 13 inadvertently causes such release and to delay the latter, between the outer peripheral face 43 of the latch 13 and the inner face 23 of the body 1 is disposed a

  elastic spiral band 14 independent of the lock 13 and which pre-

  a mass, a shape, a rigidity and a prestressing such that, at rest, that is to say when the latch 13 is stationary, this elastic spiral band 14 is wound around the outer peripheral face of the latch 13 and enclose so as to be frictionally attached thereto, and such that they then allow the following unwinding process of the strip, according to which the operator of the trade will easily determine the values to be given to this mass (especially in terms of mass linear), this form (in particular in terms of width and length of the band), this rigidity and this prestress applied to the winding, in the factory, of the band around the face 43 of the lock 13.

  At rest, that is during storage and feeding

  in the weapon, the latch 13 and the elastic spiral band 14 which is thus integral therewith are free to rotate around

  the axis 25 relative to the body 1 by mounting the lock 13 de-

written above.

  At the moment of the shot, and during its course in the tube

  weapon, the projectile and, with it, the rocket body 1 moves

  cent in a direction 56 which is here inverse of the direction 27 but could be identical, undergoing a powerful acceleration, whose value is for example of the order of 60 000 to 120 000 times the value of the field of terrestrial attraction, and the bolt comes by inertia flatten backwards with reference to the direction 56, against any possible counterpart; andin the illustrated example, the lock 13, by its faoe 45 and by means of the flange and the washer 11, is pressed against the shoulder 12, which ensures by friction its attachment to the rotation around the axis 25 with the body 1 in the direction of gyration such as 58, therefore, the latch 13 and the elastic spiral band that it bears, here itself bearing frictionally against one of the faces 50 of the washer 10 , are rotated about the axis 25 at the same speed as the body 1, in the same direction 58, to reach the mouth of the weapon tube a maximum rotational speed which is for example of the order from 40,000 to 60,000 towers

  per minute, starting from an initial value of zero.

  This state of total solidarity of the various elements of the device with the body 1 preserves the initial state illustrated

in Figures 1 and 5.

  As soon as the crossing of the mouth, the acceleration in the direction 56 ceases to be replaced by a deceleration whose value is for example of the order of 40 times the value of the field of terrestrial attraction; all the elements of the device movable inside the body 1 tend then inertia to move forward, with reference to the direction 56, and are pressed against

  any possible counterparty and, in particular, lock 13 crosses

  the axial play of mounting to come S 'apply against a counter

  part of the body 1 forward, with reference to direction 56, that is,

  say here against the central area 48 of the face 21 which provides a

support to his faoe 44.

  At the same time, the outer turn of the spiral band 14

  tends to emerge outwards under the action of the

  and flush against the lower peripheral face 23 of the body 1, so that it follows the total centrifugal flow of the spiral strip 14 which will be noted that for this purpose, the winding is such that the areas of the spiral strip respectively closer and closer to the axis 25 follow one another in the direction of gyration,

  determined by the direction of the gun barrel scratches (Figure 5).

  At the end of this process, the spiral band 14 is inte-

  widely wound between the inner peripheral face 23 of the body 1, and secured to the latter by friction due to the centrifugal force, and the outer peripheral face 43 of the latch 13 is

totally unobstructed.

  The latch 13, thus released from the action of the spiral strip 14, is subjected to a centrifugal force equivalent at least to that resulting from the rotational speed of the body I of the projectile and

  opens freely or breaks in order to come in turn, by a central movement

  trifuge, apply against the spiral band 14 which ensures its

  friction at such a rate that it maintains the action of sufficient centrifugal force to keep it

  end 47 of the washer 11.

  FIG. 1 illustrates the initial state of the device, the spiral strip 14 being wound around the latch 13 itself closed on the shaft 15, whereas FIGS. 2 and 3 illustrate states in which the spiral strip 14 is pressed against the inner peripheral face 23 of the cavity 22, the latch 13 being in an intermediate state of its centrifugal migration in FIG. 2 while it is in the final stage thereof in FIG. spiral band 14 itself pressed against

the face 23.

  During this centrifugal movement, the lock 13 imposes via the washer 11, because of the shape of the face 21 of the body 1, against which it is then forced to move, a sliding movement of the sleeve 8 inside the bore 9 in the direction opposite to the direction 27, to cause the release of the rotor 4 in the direction of alignment of its own axis of inertia 26 with the axis

of turning 25.

  For this purpose, the washer 11 can be rigid

  or, preferably and as illustrated, semi-

  rigid but elastically deformable from an initial planar conformation, perpendicular to the axis, in which it is illustrated in Figures 1 and 4 with reference to which it will be described now; it has a central orifice 20 for its passage through the sleeve 8, which has for this purpose a cylindrical shape of revolution about the axis 25 with a diameter greater than that of the face 34 of the sleeve 8 but smaller than the diameters respective faces 38 and 31 respectively of the flange 10 and the shoulder

12 of the base 2.

  From the inner periphery 46 of the washer it as well

  defined by the orifice 20 radiate slots 192 regularly distributed

  around the axis 25 and here three in number; opening into the inner periphery 46 of the washer 11, these slots 19 are against closed towards the outer periphery 47 thereof also cylindrical of revolution about the axis 25 with a sufficiently smaller diameter than that of the face 23 so that when the spiral band 14 and the latch 13 are pressed against this face 23, they completely clear the periphery

  outer ring 47 of the washer is shown in Figure 3.

  The face 21 of the body 1 is characterized by a concave shape, defined by a ramp 18 placed opposite the outer periphery 47 of the washer 11 if one refers to the direction of the axis 25, and which connects the central area 48 to

a peripheral zone 49.

  The central zone 48, projecting the shaft 15, is annular, flat, perpendicular to the axis of gyration 25 and is delimited on the one hand by a circular inner periphery junction with the outer peripheral face 41 of the hollow shaft 15 and secondly by an outer circumference, also circular, of connection with the ramp 18; the peripheral zone 49 is also annular, plane, perpendicular to the axis 25, and it is delimited by a circular outer periphery of connection with the face 23 of the cavity 22 and by an inner circumference also circular connecting with the

Ramp 18.

  The peripheral zone 49 is shifted with respect to the zone 48 in the direction 27, and the ramp 18 which connects them has the form of a truncated cone of revolution about the axis 25, diverging in the direction 27, with a taper such as,

  during its centrifugal movement by hacmothetia linked to its opening

  ture, the solid latch 13, which tends to maintain its average orientation along the axis 25, comes to bear on the one hand against the ramp 18 and secondly against the face 50 of the washer 11 which is placed next to the face 21 and against which the flange 10 of the locking sleeve 8 is supported by its face 37 around the central orifice 20 to cause during the continuation of the centrifugal movement the application to the washer 11, in a localized area cantilevered with respect to the shoulder 12 of the base 2, a thrust in the direction 27 resulting in a tilting of the washer 11 relative to

  to the axis 25, because of its support on the shoulder 12.

  In the exemplary preferred embodiment illustrated, this switchover is accompanied by an elastic deformation of the

washer 11.

  The zone of the outer periphery 47 thereof serving to support the latch 13 moves in the direction 27 with respect to

  port at the shoulder 12 while leveraged, that is,

  say by pivoting the face 51 of the washer Il turned in the direction 27 on the circular edge 52 of connection between the faces and 31 of the shoulder 12, the areas of the washer it located beyond the support of its faoe 51 on the edge 52 move in the opposite direction; this movement can be carried out freely to the extent that the solid lock 13 is no longer a spacer now the washer it applied flat by its faoe 51 on the face 30 of the shoulder 12 of the base 2 by means of the collar 10 of the sleeve 8; it results in a push

  applied in the opposite direction of the direction 27 on the face 37 of the collar-

  10 through the face 50 of the washer 11, resulting in a sliding movement of the sleeve 8 in the opposite direction of the direction

  27 relative to the base 2 and its clearance vis-à-vis the frailty

  sure 7 rotor 4, and unlocked cane shown in Figure 2.

  As soon as the rotor 4 is unlocked, it gains by a gyroscopic effect a position in which its own axis of inertia 26 coincides with the axis 25 and in which the countersink 24 is

  placed next to the sleeve 8; for this purpose, the angular shift

  line C brought back to center C, between the two counters 7 and 24

is less than 90.

  Preferably, when, at the end of the centrifugal movement of the solid latch 13, it is pressed against the face 23 of the cavity 22 via the spiral band 14, the washer 11 escapes the latch 13, fully located at outside its outer periphery 47, and the washer 11 resumes elastically a flat conformation, which allows the sleeve 8 to return to a projecting position inside the housing of the rotor 4 in a position of alignment of its channel 28 with the interior of the sleeve 8 and with the channel 53,

Figure 3 illustrates this.

  It should be noted that no additional specific Dyen appeared to be necessary.

  to make the return of the auger 8 into a locking position; such a return can be caused by inertia, as the movement of the striker 17 in the direction 27, as the case may be during the percussion with an obstacle if the progression of the rocket is in the direction 27, for example in the case of an explosive projectile, either during an acceleration exceeding a determined value, in the case of a projectile proceeding in the opposite direction of the direction 27, as it may be the case of a rocket

propulsion.

  Various variants could be provided without departing from the scope of the invention, particularly as a function of use of the device for locking components of a pyrotechnic chain other than a rotor containing a primer-detonator, and in particular for interrupting or establishing an electrical circuit for supplying safety functions or active functions In general, parts in relative rotation or in relative translation will be designed and processed in such a way as to

  to reduce at the maximum the friction forces.

Claims (7)

  1) Safety device for gyratory projectile ccapor-   both inside the body (1) of the projectile, having a defined axis of gyration (25), a member (4) movable between two positions relative to the body (1) and locking means comprising a finger (8) slidably mounted in the body (1) and cooperating with the movable member (4) to immobilize it relative to the body (1) in a first of said positions or to release this member (4) vis-à-vis a movement towards its second position, characterized in that the finger (8) is slidably mounted in the body (1) along the axis of gyration (25) thereof and abutting in one direction   determined (27) parallel to the axis of gyration (25) against a counter   part (12) of the body (1) via a central zone of a washer (11) oriented on the axis of turn (25) and having a   outer periphery (47) cantilevered with respect to the counter   part (12), and in that the locking means furthermore comprise: a latch (13) at least partially in the form of a sleeve arranged around an axial shaft (15) of the body (1) with respect to which it is free at rotation around the axis of gyration (25), said latch (13) being in abutment, with an axial clearance compatible with this relative rotation freedom, in said determined direction (27) against a zone (10) finger (8) and in opposite direction against a central zone (48) of a bearing face (21) of the body (1) having a concavity oriented on the axis of gyration (25), so that the latch (13) ensures a bridging between said central zone (48) of this bearing face (21) and this zone (10) of the finger (8), itself abuts against the counterpart (12) of the body (1). ) via the central zone of the washer (11), said latch (13) being able to open under the action of the centrifugal force, beyond a value of the speed e of gyration less than the maximum value thereof, and the shape of said bearing face (21) of the body (1) being such that such centrifugal opening of the latch (13) causes, by pressing the latch ( 13) respectively against a peripheral zone of the washer 253726 e   (11) and against the face (21), one moves from this peripheral zone   47) of the washer (11) relative to the counterpart (12) in the determined direction (27), causing by a lever action a movement of the finger (8) with respect to the body (1) in the opposite direction, an elastic spiral band (14) whose mass, shape, rigidity and prestressing are such that it is   wrapped around the latch (13) and 1 encloses so as to be soli-   friction, at rest and as long as it undergoes   darisant by inertia with the body (1) to the acceleration of the projectile in the barrel, a joint gyration with the body (1) at a speed increasing from zero to said maximum value, and that its outer turn tends to be released under the action of centrifugal force for a value slightly less than or equal to this   maximum value for pressing against an integral peripheral face.   upper (23) of the body (1) and frictionally fasten, so that, at the exit of the projectile out of the oma tube, there occurs a centrifugal flow of the elastic spiral band   (14) with release of the latch (13) from its central opening   trifuge, then this centrifugal opening.   Z: 0 2) Device according to claim 1, characterized in that the body (1) is internally dimanced so that there remains around the washer (11) a space adapted to receive the spiral strip (14) after its centrifugal clearance and the latch (13) open, in a position in which these two elements release the washer (11) 3   3) Device according to any one of the claims   preceding, characterized in that said concavity of the bearing face (21) of the body (1), oriented on the axis of gyration (25), is defined by a ramp (18) placed opposite the outer periphery ( 47) of   the washer (11) if one refers to the direction of the axis of gyration.   (25), said ramp (18) interconnecting said central zone (48) and a planar, annular peripheral zone (49) of the bearing surface (21) of the body (1).   4) Device according to any one of the preceding claims   cedeentes, characterized in that the washer (11) is distinct from the finger (8).   ) Device according to any one of the preceding claims, characterized in that said counterpart (12) of the body is constituted by an annular shoulder of the latter, of   revolution about the axis of gyration (25), presenting a peripheral   outside (52) back towards it in relation to the   outer wall (47) of the washer (11).   6) Device according to claim 5, characterized in that the washer (11) has a central orifioe (20) defined by an inner periphery (46) set back towards the gyration axis (25) relative to the outer periphery (22) of the shoulder (12).   7) Device according to any one of the claims   previous, characterized in that the washer (11) is elastic.   8) Device according to claims 6 and 7 in   its, characterized in that the washer (11) has a plurality of radial slots (19) déboudiant in llorifioe central (20) and   -: closed towards the outer periphery (47) of the washer (11).   9) Device according to claim 4 in combination with   any of claims 6 and 8, characterized in that   the finger (8) passes through the washer (11) from side to side along the axis of gyration (25) and has a first end provided with a bearing flange transverse to the axis (25), interposed between the latch (13) and the washer (11), and a second end located beyond the washer (11) relative to the first end and cooperating with said movable member (4);