EP0437871B1 - Mechanism for a munition device - Google Patents

Mechanism for a munition device Download PDF

Info

Publication number
EP0437871B1
EP0437871B1 EP90202944A EP90202944A EP0437871B1 EP 0437871 B1 EP0437871 B1 EP 0437871B1 EP 90202944 A EP90202944 A EP 90202944A EP 90202944 A EP90202944 A EP 90202944A EP 0437871 B1 EP0437871 B1 EP 0437871B1
Authority
EP
European Patent Office
Prior art keywords
spindle
conveyor means
arming element
engagement
arming
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.)
Expired - Lifetime
Application number
EP90202944A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0437871A3 (en
EP0437871A2 (en
Inventor
Gustav Karlstedt
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.)
Saab Bofors AB
Original Assignee
Bofors AB
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 Bofors AB filed Critical Bofors AB
Publication of EP0437871A2 publication Critical patent/EP0437871A2/en
Publication of EP0437871A3 publication Critical patent/EP0437871A3/en
Application granted granted Critical
Publication of EP0437871B1 publication Critical patent/EP0437871B1/en
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
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/20—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a securing-pin or latch is removed to arm the fuze, e.g. removed from the firing-pin

Definitions

  • the present invention relates to a mechanism for a munition device, including a housing with an arming element, a rotatable spindle for transmission of a rotary movement in a first direction of rotation of the spindle to an axial movement of the arming element, and a movable member, for instance being part of a timing mechanism, the movable member being for instance a rotor, which may be in the form of a detonator block, the arming element being axially movable between a safe position, in which it is in engagement with the movable member such that the latter is unable to move, and an armed position, in which the arming element is disengaged from the movable member so that the latter is able to move, the arming element and the spindle being interconnected by a thread connection.
  • the invention relates particularly, but not exclusively, to a mechanism for arming and disarming of a munition device in the form of an anti-tank mine.
  • the object of the present invention is to provide a mechanism of the kind indicated by way of introduction, which enables a disarming or neutralization of the mechanism with the use of only minimal forces.
  • Figure 1 is a sectional view of a portion of a mechanism in accordance with the invention in a safe position.
  • Figure 2 illustrates the same sectional view as Figure 1, but with the mechanism in an armed position.
  • Figure 3 illustrates a partial sectional view taken along the line III-III of Figure 4 of an alternative embodiment of the mechanism shown in Figure 2.
  • Figure 4 shows the mechanism in accordance with Figure 2 in a position wherein a disarming of the mechanism has started.
  • Figures 5-7 show a sectional view along the line V-V of Figure 1, VI-VI of Figure 2, and VII-VII of Figure 4, respectively.
  • Figure 1 there is shown a portion of a housing 1 for an anti-tank mine incorporating a mechanism according to the invention.
  • the mechanism includes a partially shown movable member 2 incorporated in a timing mechanism not shown, the member 2 being in the form of a rotor, for instance, which may, for instance, constitute a detonator block having a detonator which, in a predetermined angular position (armed position) of the detonator housing is aligned with a firing train in a way generally known and therefore not shown.
  • the mechanism according to the invention also includes a substantially elongated arming element 3 being axially movable against the action of a helical spring 4, below referred to as the return spring, from a safe position, shown in Figure 1, to an armed position, shown in Figure 2.
  • the return spring 4 In its safe position the arming element 3 engages a mating recess 5 in the movable member 2 such that this is retained in the safe position shown in Figure 1.
  • the return spring 4 is biassed between a recess 6 in the arming means and a recess 7 in the housing 1.
  • a starwheel 8, which is controlled by a motor not shown, is rigidly connected to one end of a threaded spindle 9 being rotatably journalled in the housing 1.
  • the spindle 9 is, via a thread connection 10-12, operatively connected to the arming element 3 such that a rotary movement of the spindle 9 will transmit an axial movement to the arming element 3.
  • the thread connection consists of the thread of the spindle 9 and of a conveyor means in the form of a conveyor plate 10.
  • the conveyor plate 10 has one end pivotally journalled on a shaft 11 which is journalled in the arming element 3. Another end of the conveyor plate 10 is provided with a thread profile 12 mating with the thread profile of the spindle.
  • a strip spring 13 below referred to as the control spring, holds the thread profile 12 of the conveyor plate into engagement with the thread of the spindle 9.
  • the control spring 13 urges the conveyor plate 10 against a stop means 14 (see Figure 5) in the arming element 3.
  • the return spring 4 and the control spring 13 will form return means for returning the arming element 3 from an armed to a safe position when a disarming or neutralization of the mechanism is desired.
  • the engagement between the thread profile 12 of the conveyor plate and the thread of the spindle 9 is dimensioned to give such a friction between the conveyor plate and the spindle during its rotation in a first direction of rotation, see arrow 15 in Figure 6, that a rotary force will act on the conveyor plate in order to retain the conveyor plate 10 in a very firm engagement with the spindle 9.
  • the spindle 9 is turned in the direction of arrow 15 ( Figure 6) by means of the above mentioned motor, not shown, to which it is connected via the starwheel 8.
  • the thread profile 12 of the conveyor plate will now function as a threaded nut, and will move axially along the spindle 9.
  • the arming element 3 will be conveyed by the conveyor plate 10 and will then bias the return spring 4 sunch that energy for any later disarming act will be stored therein.
  • the friction between the conveyor plate 10 and the spindle 9 will, as has been mentioned above, give a rotary force on the conveyor plate, such that the latter will be retained in engagement with the spindle.
  • the positon of the arming element 3 is detected in a predetermined point of its movement by means of sensor means, not shown, and the motor (not shown) is stopped when the arming movement (Figure 2) has been completed.
  • the motor will be driven in a reverse direction of rotation, see arrow 16 in Figure 7, a short distance.
  • the friction between the conveyor plate 10 and the spindle 9 will now give the conveyor plate a rotary force which turns the latter out of engagement with the spindle (see Figures 4 and 7).
  • the arming element 3 is now entirely released from the spindle and is, by means of the return spring 4, brought back into engagement with the movable member 2, i.e. to the safe position shown in Figure 1.
  • the control spring 13 will simultaneously bring the conveyor plate 10 again into engagement with the spindle 9. The mechanism is thus brought back to its starting position.
  • a wedge element 17, see Figure 3 is arranged in the arming element 3 in the way of the conveyor plate.
  • a disarming act may be accomplished by continuing to drive the motor in its original direction of rotation.
  • the wedge element 17 will then urge the conveyor plate 10 out of engagement with the spindle 9, whereupon the return and control springs will bring the mechanism back to the starting position in the same manner as in the first embodiment.
  • return means 4 and 13 are shown as springs it is conceivable within the scope of the invention to alternatively design them as electromagnetic means.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Conveyors (AREA)
  • Storing, Repeated Paying-Out, And Re-Storing Of Elongated Articles (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Toys (AREA)
  • Air Bags (AREA)
EP90202944A 1990-01-09 1990-11-07 Mechanism for a munition device Expired - Lifetime EP0437871B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9000062A SE463637B (sv) 1990-01-09 1990-01-09 Mekanism foer en ammunitionsenhet
SE9000062 1990-01-09

Publications (3)

Publication Number Publication Date
EP0437871A2 EP0437871A2 (en) 1991-07-24
EP0437871A3 EP0437871A3 (en) 1991-09-04
EP0437871B1 true EP0437871B1 (en) 1994-07-20

Family

ID=20378191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90202944A Expired - Lifetime EP0437871B1 (en) 1990-01-09 1990-11-07 Mechanism for a munition device

Country Status (3)

Country Link
EP (1) EP0437871B1 (sv)
DE (1) DE69010879T2 (sv)
SE (1) SE463637B (sv)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2025005A (en) * 1978-07-04 1980-01-16 Vickers Ltd Detonating Device
US4489656A (en) * 1983-02-22 1984-12-25 The United States Of America As Represented By The Secretary Of The Navy Penetrating ordnance safe and arming mechanism
FR2563622B1 (fr) * 1984-04-26 1987-10-02 France Etat Armement Dispositif de securite et d'armement pour engins explosifs
FR2624630B1 (fr) * 1987-12-11 1990-03-30 Thomson Brandt Armements Dispositif d'alignement d'une chaine d'elements, notamment applicable a une chaine pyrotechnique

Also Published As

Publication number Publication date
EP0437871A3 (en) 1991-09-04
SE9000062D0 (sv) 1990-01-09
SE463637B (sv) 1990-12-17
DE69010879T2 (de) 1994-12-01
DE69010879D1 (de) 1994-08-25
EP0437871A2 (en) 1991-07-24

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