EP0207822A1 - Sicherheitsvorrichtung für von Rohren abgeschossenen explosiven Flugkörper - Google Patents

Sicherheitsvorrichtung für von Rohren abgeschossenen explosiven Flugkörper Download PDF

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Publication number
EP0207822A1
EP0207822A1 EP86401088A EP86401088A EP0207822A1 EP 0207822 A1 EP0207822 A1 EP 0207822A1 EP 86401088 A EP86401088 A EP 86401088A EP 86401088 A EP86401088 A EP 86401088A EP 0207822 A1 EP0207822 A1 EP 0207822A1
Authority
EP
European Patent Office
Prior art keywords
locking means
safety device
spring
flap
shape memory
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
EP86401088A
Other languages
English (en)
French (fr)
Other versions
EP0207822B1 (de
Inventor
Alain Bonnet
Georges Lemonnier
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.)
Cessione giat Industries
Original Assignee
Direction General pour lArmement DGA
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, Etat Francais filed Critical Direction General pour lArmement DGA
Publication of EP0207822A1 publication Critical patent/EP0207822A1/de
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Publication of EP0207822B1 publication Critical patent/EP0207822B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/38—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein arming is effected by chemical action

Definitions

  • the technical sector of the present invention is that of safety devices for explosive devices of the mine, missile or rocket type.
  • an explosive device must have two safety systems that can be operated independently of one another.
  • a safety screen or shutter is generally used, interrupting the pyrotechnic chain of the device and capable of fulfilling all the safety requirements.
  • the operation of the machine must be such that the safety devices should not be erased until after a certain time after launch, which requires detection of the ejection order.
  • the object of the present invention is to provide a safety device usable in explosive devices of the type mine, missile or rocket launched using a tube mounted for example on a helicopter.
  • the invention therefore relates to a safety device for an explosive device of the rocket or missile mine type, launched from a tube comprising in particular a safety flap held by a first locking means the erasure of which is prohibited by a means blocking device, characterized in that it comprises a second means for locking the flap, indexed on the tube and an intermediate locking means for the movement of the second locking means cooperating with the locking means, on the one hand, and a spring with shape memory, the change of mechanical characteristics of which clears the blocking means.
  • a result of the present invention lies in its small footprint allowing miniaturization.
  • the device according to the invention replaces the ejection order detector and the arming delay.
  • the spring by its elongation and its retraction with delay, plays a double role.
  • the invention therefore makes use of the shape memory effect by activation that certain alloys have, the most common of which is a nickel-titanium alloy (50/50), copper-zinc -aluminum / copper-aluminum-nickel or gold- silver- platinum.
  • a shape memory alloy is an alloy which, having undergone deformation, regains its initial shape as soon as its temperature increases under the effect of the passage of an electric current. This effect is different from that of a bimetallic strip because it only occurs at a particular temperature which is chosen during its definition and does not regain its previous form unless it is subjected to a new mechanical deformation. This effect results from a reversible martensic transformation, that is to say a modification of the crystal structure.
  • the alloy To have a shape memory, the alloy must undergo a transformation reversible austenite-martensite of its crystal structure. This transformation, which occurs without diffusion, consists in the passage of the so-called austenitic structure in the high temperature phase into a different crystalline structure called martensic by cooling the alloy. Many alloys have a martensic transformation, but shape memory alloys have an extremely symmetrical martensic structure. These have a typical centered cubic structure in the austenitic phase and a highly twinned structure in the martensic phase. This twin structure allows the alloy to absorb significant shape changes and return to the initial shape when returning to the austenitic structure.
  • the force due to shape memory is determined by starting from the force which a spring can exert according to Hocke's law before the characteristics of the austenitic Ni-Ti alloy.
  • the corresponding stroke is determined by considering the modulus of this martensic alloy and the force obtained from the austenitic form.
  • the flap is part of a pyrotechnic chain shown in fig. 2, of a completely classic type.
  • the shutter 2 is held stationary by two latches 4 and 5 integrated in the respective housings 6 and 7 formed in the body of the projectile.
  • the lock comprises a body 4a whose external diameter corresponds to the internal diameter of the housing 6, extended by frustoconical bearing surfaces on which one bears a ball 8 constituting the locking means.
  • the body 4a is extended on the flap side 2 by a rod 4b engaging in a hole 9 in the flap, the external diameter of this end being less than that of the body.
  • a helical spring 10 is disposed around the end 4b between the body 4a and a shoulder 11 of the housing 6.
  • the other end 4c of the body is subjected to the action of a spring 12 with shape memory bearing on a plate 13.
  • the latch 5 is engaged at one end in a hole 14 in the flap and bears at the other end on the launching tube 3.
  • the latch 5 comprises, in the vicinity of the flap 2, a radial hole or a groove 15, the cooperation of which with the intermediate locking means will be explained below, the other end being supported on the tube 3.
  • the lock 5 is provided with a shoulder 16.
  • a helical spring 17 is disposed between the shoulder 16 and a stop 18 of the housing 7 and ensures, after ejection of the machine, the release of the flap 2 by the lock 5
  • the latch 5 is arranged perpendicular to the latch 4.
  • the intermediate locking means represented by the latch 19, is arranged parallel to the latch 4 in a housing 20a, in which it slides and comes to bear on a stop 20b.
  • This lock 19 comprises a body 19a and a cylindrical finger 19b; the body 19a consists of a frustoconical part bearing on the ball 8 and a cylindrical part whose external diameter corresponds to the internal diameter of the housing 20a.
  • This cylindrical part is provided with a circular groove 21 intended to cooperate with the ball 8.
  • a spring 22 is arranged around the finger 19b and bears on the body 19a and on a shoulder 23 of the housing 20.
  • the finger 19b engages in the radial hole 15 of the latch 5 so as to prohibit its possible translation.
  • Fig. 2 shows a section A-A according to FIG. 1 where we see the flap 2, the hole 9, the latches 5 and 10 and the pyrotechnic elements adjacent to the flap. These elements are for example constituted upstream of the shutter 2, the primer 24 initiated electrically for example and downstream by the priming relay 25.
  • the alignment of the pyrotechnic chain is achieved by translation or rotation of the flap 2 in which a relay 26 is inserted. Thus, the relay 26 is aligned with the primer 24 and the relay 25 which ensures the transmission of the detonation.
  • FIGS. 3, 4 and 5 The operation of the device is illustrated in FIGS. 3, 4 and 5.
  • the spring 12 Before launching the machine 1, the spring 12 is supplied with a tension U (fig. 3) which has the effect of raising its temperature above the threshold causing its change in characteristics. The extension of this spring causes the translation of the lock 4 and the compression of the spring 10. The ball 8 can then disappear under the action of the intermediate lock 19 actuated by the spring 22. The lock 5 is then released but remains stationary as long as device 1 remains in tube 3.
  • the spring 17 causes the translation of the latch 5 and releases the screen 2.
  • the stroke of the latch 19 is calculated so that the ball 8 can be erased in the notch 21 of the latch 19.
  • the tension U then disappears and the spring 12 loses after a certain time cooling its mechanical characteristics.
  • the spring 12 no longer opposes the opposite action of the spring 10 (fig. 5) and the translation of the latch 4 causes the ball 8 to be completely erased in the notch 21.
  • the final unlocking of the screen 2 is thus achieved and the translation or rotation thereof can occur, under the effect of a spring not shown, to align the pyrotechnic chain.
  • the flap then comprises a first imprint 27 in which is placed a ball 28 held in place by the latch 4, the release of which is prohibited by the ball 8, cooperating with the conical bearing surface 29 of this latch and a second imprint 30 in which is placed a ball 31 held in place by the latch 5 bearing on the launching tube.
  • the latch 19 consists of a body 32 having a blind longitudinal bore 33 inside which slides an axis 34 provided with a stop 35.
  • the body 32 is terminated by a claw 36 for hooking the spring 12, and comprises an internal shoulder 37.
  • a helical spring 38 is placed around the axis 34 between the stop 35 and the shoulder 37.
  • the body also has an external groove 21 intended to cooperate with the ball 8.
  • the spring 12 with shape memory is connected to an electric power source 39 delivering the current necessary for its heating.
  • the operation is as follows. Prior to the launch of the explosive device 1, the spring 12 is supplied with a voltage U, which has the effect of raising its temperature above the threshold causing its change in characteristics. The spring 12 is compressed and causes the translation of the body 32 compressing the spring 38. The latch 5 is then released. After launching the machine, the lock is no longer held by the tube 3 and the spring 17 acts by releasing the ball 31.
  • the supply of the spring 12 is cut off, which causes its previous mechanical characteristics to disappear.
  • the spring 38 can then come into action which causes the translation of the body 32 until the groove 21 arrives at the level of the ball 8.
  • the ball 8 is then driven into the groove 21 by the conical bearing 29 of the latch 4 under the effect of the spring 11.
  • the ball 28 is then released and the flap 2 can be actuated in a conventional manner either by translation or by rotation to align the pyrotechnic chain as described in relation to FIG. 2.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Toys (AREA)
EP86401088A 1985-05-31 1986-05-23 Sicherheitsvorrichtung für von Rohren abgeschossenen explosiven Flugkörper Expired EP0207822B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8508183A FR2582799B1 (fr) 1985-05-31 1985-05-31 Securite pour engin explosif destine a etre lance a partir d'un tube
FR8508183 1985-05-31

Publications (2)

Publication Number Publication Date
EP0207822A1 true EP0207822A1 (de) 1987-01-07
EP0207822B1 EP0207822B1 (de) 1989-07-12

Family

ID=9319719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401088A Expired EP0207822B1 (de) 1985-05-31 1986-05-23 Sicherheitsvorrichtung für von Rohren abgeschossenen explosiven Flugkörper

Country Status (3)

Country Link
EP (1) EP0207822B1 (de)
DE (1) DE3664380D1 (de)
FR (1) FR2582799B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2661725A1 (fr) * 1990-05-03 1991-11-08 Saint Louis Inst Dispositif pour separer deux espaces en cas d'elevation de temperature, procede pour realiser ce dispositif et munition comportant un tel dispositif.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2707753B1 (fr) * 1993-06-28 1995-09-22 Giat Ind Sa Dispositif de sécurité et d'armement pour engin explosif.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2352242A (en) * 1941-02-14 1944-06-27 Apstein Maurice Potential recording marker
US2750888A (en) * 1946-11-13 1956-06-19 Robert O Wynn Long delay bomb tail fuze
US2974484A (en) * 1952-01-23 1961-03-14 Robert A Cooley Ignition system for rocket motors
FR2509037A1 (fr) * 1981-07-03 1983-01-07 Diehl Gmbh & Co Dispositif de surete pour fusee de projectile
DE3126288A1 (de) * 1981-07-03 1983-05-26 Diehl GmbH & Co, 8500 Nürnberg Sicherungseinrichtung fuer geschosszuender

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3352242A (en) * 1963-11-29 1967-11-14 Charles E Mcfann Thermally initiated pyrotechnic delay time fuze

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2352242A (en) * 1941-02-14 1944-06-27 Apstein Maurice Potential recording marker
US2750888A (en) * 1946-11-13 1956-06-19 Robert O Wynn Long delay bomb tail fuze
US2974484A (en) * 1952-01-23 1961-03-14 Robert A Cooley Ignition system for rocket motors
FR2509037A1 (fr) * 1981-07-03 1983-01-07 Diehl Gmbh & Co Dispositif de surete pour fusee de projectile
DE3126288A1 (de) * 1981-07-03 1983-05-26 Diehl GmbH & Co, 8500 Nürnberg Sicherungseinrichtung fuer geschosszuender

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2661725A1 (fr) * 1990-05-03 1991-11-08 Saint Louis Inst Dispositif pour separer deux espaces en cas d'elevation de temperature, procede pour realiser ce dispositif et munition comportant un tel dispositif.

Also Published As

Publication number Publication date
FR2582799B1 (fr) 1987-11-13
DE3664380D1 (en) 1989-08-17
EP0207822B1 (de) 1989-07-12
FR2582799A1 (fr) 1986-12-05

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