EP0354088A1 - Vorrichtung zum Öffnen der Flügelschäfte eines Geschosses - Google Patents

Vorrichtung zum Öffnen der Flügelschäfte eines Geschosses Download PDF

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Publication number
EP0354088A1
EP0354088A1 EP89402060A EP89402060A EP0354088A1 EP 0354088 A1 EP0354088 A1 EP 0354088A1 EP 89402060 A EP89402060 A EP 89402060A EP 89402060 A EP89402060 A EP 89402060A EP 0354088 A1 EP0354088 A1 EP 0354088A1
Authority
EP
European Patent Office
Prior art keywords
striker
locking member
piston
holder
control member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89402060A
Other languages
English (en)
French (fr)
Other versions
EP0354088B1 (de
Inventor
Claude Boutet
Daniel Guenin
Jean Rat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giat Industries SA
Original Assignee
Direction General pour lArmement DGA
Giat Industries SA
Etat Francais
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Direction General pour lArmement DGA, Giat Industries SA, Etat Francais filed Critical Direction General pour lArmement DGA
Priority to AT89402060T priority Critical patent/ATE78334T1/de
Publication of EP0354088A1 publication Critical patent/EP0354088A1/de
Application granted granted Critical
Publication of EP0354088B1 publication Critical patent/EP0354088B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
    • F42B10/02—Stabilising arrangements
    • F42B10/14—Stabilising arrangements using fins spread or deployed after launch, e.g. after leaving the barrel
    • F42B10/20—Stabilising arrangements using fins spread or deployed after launch, e.g. after leaving the barrel deployed by combustion gas pressure, or by pneumatic or hydraulic forces

Definitions

  • the present invention relates to a device for opening the tail of an artillery projectile.
  • the deploying tail unit has the advantage of being less bulky in length than a fixed tail unit which, to be effective, must be pushed far behind the body of the projectile; in fact, for a smaller footprint, it allows better stabilization, therefore greater precision.
  • this type of empennage allows the shooting by means of a tube with the caliber of the projectile.
  • document FR-A-2 221 707 discloses an artillery projectile tail opening device, of the type comprising a mounting body, an opening control member movable axially with respect to said body. from a first position where it keeps the tail closed, to a second position where it keeps the tail open, and control means for said control member, said control means comprising a piston sensitive to the pressure of the gases in the launcher tube and a gas generator arranged to bring the opening control member from its first to its second position.
  • the gases act on the fins by means of differential pistons subjected in the tube to the pressure of the propellant gases of the projectile exerted on a large surface of this piston, the gases tending to open the fins n ' acting only on a significantly smaller surface.
  • the thrust due to the propellant gases is very significantly greater and therefore keeps the tail closed.
  • the present invention aims to overcome these drawbacks by providing a simple and therefore inexpensive device allowing an almost instantaneous opening of the tail unit as soon as it leaves the tube, and only outside the tube, in a perfectly symmetrical manner.
  • the invention also aims to provide a device having all the guarantees of storage and handling security.
  • the subject of the present invention is a device for opening the tail of an artillery projectile of the type mentioned above, characterized in that said control means comprise: - a striker for the gas generator, a striker holder member to which the striker is linked by unlockable blocking means, a locking member arranged to keep the locking means locked in a first relative position of the striker holder and the locking member and to unlock them in a second relative position, holding means for holding the striker-striker-striker-locking member assembly in a storage position relative to the control member while maintaining the striker holder and the locking member in their first relative position, - Said piston, arranged to bring against the action of the means for holding said assembly from said storage position to an arming position when the pressure exerted on said piston exceeds a first predetermined value, while maintaining the striker holder and the the locking member in their first relative position as long as said pressure remains above a second predetermined value, and - elastic means for bringing the striker holder and the locking member into their second
  • the striker in the storage position, the striker is kept in the locked position in the striker holder. Only the considerable pressure (of the order of 2000 bars) prevailing in the barrel chamber at the start of the shot can oppose the holding means, and thus bring the assembly constituted by the striker holder the striker and the locking member in the armed position. Again, there is no risk of premature opening of the tail since the striker holder remains locked until the elastic means can oppose the pressure prevailing in the tube. However, when the projectile is about to leave this tube, the pressure is still extremely high (of the order of 400 bars). It is therefore sufficient to calibrate the spring so that it can only oppose a pressure of a few bars (for example 15 bars) to be absolutely certain that it will not cause the striker to be unlocked before the projectile is completely out of the tube.
  • said locking means comprise at least one claw connected to the striker holder and engaged in the locked position in a corresponding recess of the striker, said claw being held in the recess by a stop surface of the locking member when the striker holder and the locking member are in their first relative position, said abutment surface being erased when the striker holder and the locking member are in their second relative position.
  • said holding means comprise a first shear piece secured to the striker holder and engaged in the storage position in a recess in the control member, two cooperating stops of the member locking and the control member now, in this storage position the striker holder and the locking member in their first relative position.
  • the piston and the locking member are integral, the locking member then exercising the function of thrust member to bring the striker-holder-striker-locking member assembly from its storage position to its position d arming by causing the shearing of the holding means.
  • the elastic means can be produced in the form of a compression spring disposed between the striker and the locking member, and tending to separate them from each other against the action of the piston.
  • the striker holder and the control member may more particularly comprise cooperating abutment surfaces, these abutments being maintained in contact in said cocking position under the action of the piston.
  • the striker holder and the locking member are arranged to slide in a bore of the control member, and the striker is arranged to slide in a bore of the striker holder.
  • the device according to the invention may also comprise a second shear piece integral with the control member, engaged, in the first position of this member, in a recess of the body.
  • the control member can, for the sake of simplicity, form a piston sliding in a bore of the body under the action of the gases of the gas generator, which cause the shearing of the second shearing part.
  • the device of Figure 1 comprises a body 1 provided with a thread 2 for mounting on the base of an artillery projectile or on an intermediate piece. It is substantially symmetrical in revolution around an axis 00.
  • a piston 3 is slidably mounted in an axial bore of the body 1, a shear flange 4 engaged in a peripheral counterbore of the bore and blocked by a bottom plate (not shown), however preventing this sliding as long as it is not not sheared.
  • O-rings 5 seal between the piston 3 and the body 1.
  • An actuating member 8 is screwed to the rear of the piston 3 with the interposition of an O-ring seal 9.
  • a locking nut 10 is itself screwed to the rear part of the actuating member 8, for reasons which will be explained below.
  • a countersink in the piston 3 forms an annular groove 11. This groove allows the engagement of a shear flange 12 formed at the periphery of a carrier member - piercer 13 arranged in a bore 14 of the piston 3.
  • An axial bore 16 is formed in the striker holder 13, which comprises in the extension of the surface of this bore elastic branches 17 terminated at their ends by claws 18 (FIG. 2b) extending axially inwards relative at bore 16.
  • the bore 16 also receives a sliding striker 19 comprising at its outer periphery an annular groove 20 of shape complementary to that of the claws 18, so that the claws can engage in the groove.
  • the actuating member 8 also comprises a bore of the same diameter as the bore 14, and coaxial with the latter, in which is disposed a pushing piece 21 whose front part forms a locking member 22 and whose rear part forms a piston rod 23.
  • the locking member 22 has a first bore 24 towards the front and a rear bore and a second bore 25 of smaller diameter.
  • the bore 25 has a diameter such that it forms an abutment surface for the radially outer surfaces of the claws 18, thus preventing the latter from leaving the groove 20 when the front part of the thrust piece 21 is in contact with the rear part of the striker holder 13.
  • an axial bore of the striker receives a compression spring 29 bearing on the one hand on an internal face of this striker, and on the other hand on the bottom of the bores of the thrust piece 21, thus tending to spread the striker of this room.
  • the piston rod 23 carries at its rear end the piston 30 proper, which is arranged in a chamber 31 formed in the actuating member 8 and opening into the open air at its rear part through a plug. maintenance.
  • the piston 30 comprises a front part 30a of reduced diameter allowing a certain radial expansion of the piston and avoiding any jamming of the latter which would prevent the return of the thrust piece 21 and therefore the opening of the tail.
  • a slightly larger diameter portion 31a is provided in its housing in the actuating member 8.
  • the piston 30 has on its front face 30b a coating of a low friction material, in particular PTFE for example with a thickness of 0.1 mm, making it possible to ensure gas tightness.
  • a low friction material in particular PTFE for example with a thickness of 0.1 mm
  • a gas generator 32 is placed in a chamber formed at the front of the piston 3 opposite the striker 19.
  • Figure 3a shows the device described above in its storage position shown in Figure 1, and mounted at the rear part of the base 33 of an artillery projectile deploying tail.
  • This empennage consists of fins 34 rotatably mounted on an axis 35.
  • Each fin has a tooth 36 whose sides are arranged to cooperate with the sides of an annular groove 37 of the control member 15. It will be noted that these sidewalls are formed on the one hand by an external shoulder of the actuating part 8 and on the other hand, by the nut 10. The latter is screwed onto the actuating part 8 so as to adjust the clearance between the two flanks of tooth 36.
  • the groove 37 has an axial position such that it maintains the fins 34 in the folded position towards the axis of the device.
  • the chamber 31 When the projectile is placed in the firing position in the core of a barrel, the chamber 31 is therefore in communication with the chamber of this barrel. When the blow is initiated, an extremely high pressure develops in this chamber, thus pushing the part 21 forward and causing the shearing of the flange 12 of the striker holder 13.
  • the assembly constituted by the thrust piece 21, the striker holder 13 and the striker 19 are thus propelled in one piece towards the front, leaving in place the flange 12. This movement ceases when the assembly is blocked in the cocking position by two cooperating stops formed respectively from the front face 38 of the firing pin holder and a shoulder 39 produced at the front end of the bore 14. The assembly is thus held in abutment as shown in the FIG. 3b as long as there is sufficient pressure in chamber 31.
  • the abutment surface 25 is erased in front of the claws 18 of the striker holder 13.
  • the spring 29 pushes not only the pushing piece 21 backwards but also the striker 19 forwards, including the rear part 40 pushes the claws 18 axially outwards in the bore 24 under the combined action of two inclined planes 41 and 42 formed respectively on the claws 18 and on the rear flank of the groove 20 (fig.2b).
  • the striker 19 is thus released from the striker holder 13 and is propelled forward where it strikes the gas generator 32 as shown in FIG. 3c.
  • the fin 34 remains immobilized in the deployed position due to the jamming of the abutment surfaces 43, 44 on the member 15.
  • This simple, therefore inexpensive embodiment device ensures extremely rapid opening of the tail (less than 5 milliseconds) and effective locking of the fins both in the folded position and in the open position.
  • Another advantage of the device lies in the high level of security that it provides, due to the importance of the forces necessary for its activation, excluding any risk of opening following falls or other rough handling.
EP89402060A 1988-08-04 1989-07-20 Vorrichtung zum Öffnen der Flügelschäfte eines Geschosses Expired - Lifetime EP0354088B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89402060T ATE78334T1 (de) 1988-08-04 1989-07-20 Vorrichtung zum oeffnen der fluegelschaefte eines geschosses.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8810551 1988-08-04
FR8810551A FR2635178B1 (fr) 1988-08-04 1988-08-04 Dispositif d'ouverture d'empennage pour obus

Publications (2)

Publication Number Publication Date
EP0354088A1 true EP0354088A1 (de) 1990-02-07
EP0354088B1 EP0354088B1 (de) 1992-07-15

Family

ID=9369115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89402060A Expired - Lifetime EP0354088B1 (de) 1988-08-04 1989-07-20 Vorrichtung zum Öffnen der Flügelschäfte eines Geschosses

Country Status (6)

Country Link
EP (1) EP0354088B1 (de)
AT (1) ATE78334T1 (de)
CA (1) CA1334908C (de)
DE (1) DE68902108T2 (de)
FR (1) FR2635178B1 (de)
IL (1) IL91102A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2259006A1 (de) * 2009-06-05 2010-12-08 Tda Armements S.A.S. Öffnungs- und Verriegelungsvorrichtung für Munitionsleitwerk
US20110186678A1 (en) * 2008-02-07 2011-08-04 Sankovic John R Pyrotechnic fin deployment and retention mechanism
EP2620738A1 (de) * 2012-01-27 2013-07-31 Tda Armements S.A.S. Ansteuerungsteil fur Munition
EP2748557A2 (de) * 2011-08-26 2014-07-02 BAE Systems Vorrichtung zum einsetzen gelagerter steuerflächen eines geschosses

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2702833B1 (fr) * 1993-03-18 1995-05-12 Giat Ind Sa Dispositif d'étanchéité au gaz de propulsion pour munitions d'artillerie.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB188377A (en) * 1921-08-04 1922-11-06 Armstrong Whitworth Co Eng Improvements in percussion fuses for projectiles
GB789761A (en) * 1955-09-16 1958-01-29 Soc Tech De Rech Ind Improvements in projectile fuzes
FR1152013A (fr) * 1953-10-20 1958-02-10 Braunschweiger Metallwerk F Ch Mécanisme de guidage à écartement pour projectiles
FR2221707A1 (de) * 1973-03-14 1974-10-11 France Etat

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB188377A (en) * 1921-08-04 1922-11-06 Armstrong Whitworth Co Eng Improvements in percussion fuses for projectiles
FR1152013A (fr) * 1953-10-20 1958-02-10 Braunschweiger Metallwerk F Ch Mécanisme de guidage à écartement pour projectiles
GB789761A (en) * 1955-09-16 1958-01-29 Soc Tech De Rech Ind Improvements in projectile fuzes
FR2221707A1 (de) * 1973-03-14 1974-10-11 France Etat

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110186678A1 (en) * 2008-02-07 2011-08-04 Sankovic John R Pyrotechnic fin deployment and retention mechanism
US8183508B1 (en) * 2008-02-07 2012-05-22 Simmonds Precision Products, Inc. Pyrotechnic fin deployment and retention mechanism
US8338769B1 (en) * 2008-02-07 2012-12-25 Simmonds Precision Products, Inc. Pyrotechnic fin deployment and retention mechanism
US8610042B2 (en) * 2008-02-07 2013-12-17 Simmonds Precision Products, Inc. Pyrotechnic fin deployment and retention mechanism
EP2259006A1 (de) * 2009-06-05 2010-12-08 Tda Armements S.A.S. Öffnungs- und Verriegelungsvorrichtung für Munitionsleitwerk
FR2946423A1 (fr) * 2009-06-05 2010-12-10 Tda Armements Sas Dispositif d'ouverture et de verrouillage d'un empennage de munition
US8563911B2 (en) 2009-06-05 2013-10-22 Tda Armements Sas Device for opening and locking a tail unit for ammunition
EP2748557A2 (de) * 2011-08-26 2014-07-02 BAE Systems Vorrichtung zum einsetzen gelagerter steuerflächen eines geschosses
EP2748557A4 (de) * 2011-08-26 2015-04-29 Bae Systems Vorrichtung zum einsetzen gelagerter steuerflächen eines geschosses
EP2620738A1 (de) * 2012-01-27 2013-07-31 Tda Armements S.A.S. Ansteuerungsteil fur Munition
FR2986319A1 (fr) * 2012-01-27 2013-08-02 Tda Armements Sas Troncon de pilotage pour munition guidee
US8890043B2 (en) 2012-01-27 2014-11-18 Tda Armements Steering section for guided munition

Also Published As

Publication number Publication date
IL91102A0 (en) 1990-03-19
ATE78334T1 (de) 1992-08-15
IL91102A (en) 1992-06-21
CA1334908C (fr) 1995-03-28
FR2635178A1 (fr) 1990-02-09
FR2635178B1 (fr) 1990-10-12
DE68902108T2 (de) 1993-01-14
EP0354088B1 (de) 1992-07-15
DE68902108D1 (de) 1992-08-20

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