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WO1982001244A1 - Dispositif de securite de detonateur - Google Patents

Dispositif de securite de detonateur Download PDF

Info

Publication number
WO1982001244A1
WO1982001244A1 PCT/SE1980/000243 SE8000243W WO8201244A1 WO 1982001244 A1 WO1982001244 A1 WO 1982001244A1 SE 8000243 W SE8000243 W SE 8000243W WO 8201244 A1 WO8201244 A1 WO 8201244A1
Authority
WO
WIPO (PCT)
Prior art keywords
detent
sensitive
pigure
active position
projectile
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.)
Ceased
Application number
PCT/SE1980/000243
Other languages
English (en)
Inventor
Scania Ab Saab
B Kjellberg
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 AB
Original Assignee
Saab Scania 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 Saab Scania AB filed Critical Saab Scania AB
Priority to PCT/SE1980/000243 priority Critical patent/WO1982001244A1/fr
Publication of WO1982001244A1 publication Critical patent/WO1982001244A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F42C15/24—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected by inertia means
    • F42C15/26—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected by inertia means using centrifugal force

Definitions

  • the present invention relates to a detonator safety device for rotating projectiles. It includes detent mechanisms, at least one of which is sensitive to acceleration, and at least one sensitive to rotation, both of which must be released for enabling a detonator, mounted on a preferably rotatable first member, to be put into an active position for actuation by a fuse mounted on the projectile, in coaction with the device.
  • the rotation-sensitive detent mechanism is provided with a locking member, displaceable by the action of centrifugal force to an active position, for providing the release of a second member which can be activated by the acceleration-sensitive mechanism so that the first member may be displaced to its active position.
  • a detonator safety device of the kind described above is already known, and has been found to have fairly good functional reliability during storage, transport, handling, loading and firing the projectile, and for a certain time after firing.
  • the detent member of the rotationsensitive detent mechanism can be released by mistake and in certain cases, e.g. due to damage to a detail or redetails which are faulty or not fitted at all, it can remain in its released position.
  • the object of the present invention is to provide a detonator safety device by means of which the above—described drawbacks with previously known devices have been removed. This object is achieved by the invention being given the characterizing features disclosed in the claims.
  • the foremost advantage of the device in accordance with the invention is that the detent member incorporated in the rotation—sensitive detent mechanism cannot be released if it is subjected to a sudden shock, even if the shock is very heavy.
  • the detonator safety device In order to release the detent member, the detonator safety device must be first subjected to a rotational force acting for a duration of some time, and preferably an acceleration force as well, which cannot occur in a shock of the kind mentioned.
  • a further advantage with the device is that it has great functional reliability as well as being simple and cheap to manufacture and install. Purther advantages should be apparent from the following description of the best embodiment of the invention.
  • Pigure 1 and Pigure 2 are respectively a side view anda view seen from above of the detonator safety device in accordance with the invention, Pigures 3 - 7 illustrate the device according to
  • Pigure 1 when it is in phase I, which is a secured or unarmed condition for the device during storage, transport, handling and loading, and where Pigure 3 is a section along the line A-A in Pigure 1 , Pigure 4 is a section along the line B-B in Pigure 1 , Pigure 5 is a section along the line C-C in Pigure 2,
  • Pigure 6 is a section along the line D-D in Pigure 2 and Pigure 7 is a section along the line E-E in Pigure 2,
  • Pigures 8 - 10 illustrate the device in phase II, immediately before it has passed the muzzle of the barrel of a firing or launching means, and where Pigure 8 is a section along the line A-A in Pigure 1 , Pigure 9 is a section along the lineD-D in Pigure 2 and Pigure 10 is a section along the line E-E in Pigure 2, Pigures 11 and 12 illustrate the device in phase III after it has passed the muzzle, and has travelled a predetermined distance, Pigure 11 being a section along the line B-B in Pigure 1 and Pigure 12 a section along the line D-D in Pigure 2,
  • Pigures 13 and 14 show the device in phase IV, in which it is in an armed condition, Pigure 13 being a section along the line B-B in Pigure 1 and Pigure 14 a section along the line C-C in Pigure 2 and Pigure 15 is a block diagram showing the movements of specific details in the device from phase I to, and including phase IV. Best Embodiment
  • the detonator safety device in accordance with the invention must be subjected to acceleration-retardation forces as well as rotation forces of given magnitude in order, to be put into the armed condition, as illustrated in Pigures 13 and 14. In the continued description, it is assumed that these forces are sufficiently large to provide such triggering.
  • the mode of operation for the details which are sensitive to acceleration and retardation will be described at the same time as the mode of operation for the details which are sensitive to rotation, since these details coact to provide the final armed condition.
  • the detonator safety device in accordance with the invention comprises a substantially cylindrical body 1, which is conventionally attached between a fuse and a charge in the forward part of a projectile, e.g.
  • the body 1 encloses all details for keeping the device in a secured state in phases I-III, preventing the charge from being actuated by the fuse, and for arming the device in phase IV and allowing the actuation of the charge by a flame or striker thrust out from the fuse.
  • phase I the details in the body 1 assume the positions shown in Pigures 3-7.
  • a rotor 2 is rotatably mounted on a journalling pin 3 and must be turned into the position shown in Pigure 13 for enabling a booster charger 4 mounted centrally in the body 1 to detonate and actuate the charge in the projectile
  • the rotor 2 is prevented from turning and is thus kept in a secured position, by a detent 6, pivotably mounted on a journalling pin 5, there being a shoulder 6a on the detent in the path of movement of the rotor 2.
  • the rotor 2 is also prevented from turning by a segment 8 pivotably mounted on a journalling pin 7, there being a shoulder 8a on the segment 8 in the path of movement of the rotor 2 at the end thereof diagonally opposed to the end adjacent the shoulder 6a (see Pigure 4 especially).
  • the detent 6, which has a projection 6b thrusting into a recess 8b in the segment 8, prevents the latter from pivotting on the pin 7, said pivotting also being prevented by a locking pin 9.
  • the locking pin 9 is mounted for reciprocating motion in the firing direction P, in a bore 10 in the body 1, and is prevented from being displaced from its position in Pigure 7 by a ball 11, the left portion of which is accommodated between two shouldered portions 9a and 9b on the locking pin, and the right portion of which engages against a piston 12, urged by a compression spring 13 upwards into engagement against the bottom of a bore 14 parallel to the bore 10. With its upper portion (in Pigure 7) the locking pin 9 thrusts into a hole 8c in the segment 8 to prevent the segment from turning round its journalling pin 7. The segment 8 is thus locked both by the pin 9 and by the detent 6.
  • the detent 6 is locked against turning by a locking member 15 (Pigures 3 and 6), pivotably mounted on a journalling pin 5 via a ball 17 in a hole 16a formed in a wall 16 of the body 1.
  • the lower portion of the ball 17 in Pigure 6, when in the locking position, is inserted in an upwardly open recess 6c in the detent 6 and is prevented from moving upwards by the bottom face of the locking member 15.
  • phase II the details take up the positions shown in Pigures 8-10. These positions occur immediately after the rotating projectile has left the muzzle of the barrel of the firing or launching means, and its retardation has just begun. During the rotating and accelerating movement of the projectile towards the muzzle of the launching means, the detent 15 is retained in its original position by the acceleration force.
  • the piston 12 is also forced downwards from the position in Pigure 7, against the bias of the spring 13 , and the ball 11 is thus displaced to the right in Pigure 7 by the portion 9a of the locking pin 9, when the latter was given a downwardly directed movement in the bore 10 by the action of the acceleration, into the position shown in Pigure 10.
  • the piston 12 was once again returned to the position shown in Pigures 7 and 10 by the bias in the spring 13.
  • the locking pin 9 was also urged to regain its position shown in Pigure 7 after the projectile had passed the muzzle, but did so later than the piston 12, since no other force than the retardation force acted on it.
  • the locking pin 9 therefore remains in its position shown in Pigure 10 and is prevented from being displaced upwards by the ball 11 which was forced back again to the position shown in Pigure 10 during the upwardly directed displacement of the piston 12, by means of a conically shaped upper portion 12a on the piston, the ball then partly resting on the shoulder portion 9a on the locking pin.
  • the detent 6 can thus be turned clockwise round the journalling pin 5 from its position shown in Pigures 4, 6 and 9, against the bias of a spring 19 wound round the pin 5, the spring having one limb in a groove in the detent 6 and the other in a groove in the periphery of the body 1, engagement between the projection 6b and recess 8b thus ceasing. If the retardation force is not sufficiently great, the ball 17 will in any case be taken, to the position shown in Pigures 9 or 12. This occurs v/hen the detent 6 is turned, causing the ball 17 to be moved upwards in the hole 16a by the sloping right hand side wall of the recess 6c.
  • the segment 8 At its end remote from the journalling pin 7, the segment 8 is provided with a toothed section 8d (Pigures 4, 10 and 11 ) meshing with teeth on a pin 20 rotatably mounted in the body 1, on the pin there being attached a gear 21, the teeth of which mesh with teeth provided on a pin 22, rotatably mounted in the body 1 and having a gear 23 attached to it.
  • a toothed section 8d Pieris 4, 10 and 11
  • the gear 23 will turn anticlockwise in Pigure 8, with the aid of the details 20, 21 and 22, and its teeth will thereby actuate a body 25, serving the same purpose as a balance wheel, which is rotatably mounted on a hollow shaft 24 fixedly mounted in the centre of the body 1.
  • Phase III is the phase during which the detonator safety device is in the projectile trajectory at a relatively large distance from the mouth of the launching or firing barrel and before the arming time has come to an end, i.e. just before the period mentioned in the previous paragraph has come to an end.
  • the booster charge 4 must not be actuated, since the projectile must Kirk travelled a relatively long distance before it is allowed to explode.
  • the detent 6 is in its outward released position and the shoulder 8a on the segment 8 still prevents the rotor 2 from turning round the pin 3.
  • Phase IV is illustrated in Pigures 13 and 14, which show the device in an armed condition, i.e. the arming time has come to an end, and a detonator 28 enclosed in the rotor 2 is ready for actuation, e.g. by a striker thrusting through the hollow shaft 24, or a flame from a fuse mounted in the forward end of the projectile.
  • the segment 8 has assumed its outward anticlockwise end position and its shoulder 8a has been taken out of the path of movement of the rotor 2, which, by the action of the centrifugal force generated by the rotation of the projectile has been turned clockwise from the position in Pigure 11.
  • Pigure 15 there is a block diagram showing what conditions must be met for the detonator safety device in accordance with the invention to assume an armed condition. It will be apparent from the diagram what detent and locking members which are thereby released and by what forces they are affected.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Abstract

Un dispositif de securite de detonateur pour la rotation de projectiles comprend des mecanismes de detente, dont au moins l'un d'eux est sensible a l'acceleration et au moins l'un d'eux est sensible a la rotation, tous deux devant etre liberes pour permettre a un detonateur (28) monte sur un premier organe de preference rotatif (2) d'etre place dans une position active de declenchement par un fusible monte dans le projectile cooperant avec le dispositif. Le mecanisme de detente sensible a la rotation comprend un organe de detente (6), deplacable sous l'action d'une force centrifuge vers une position active pour liberer un second organe pouvant etre actionne par le mecanisme sensible a l'acceleration de sorte que le premier organe (2) puisse etre deplace vers sa position active. Un organe de verrouillage (15) cooperant avec l'organe de detente (6) est concu pour empecher le deplacement de l'organe de detente vers sa position active jusqu'a ce que l'organe de verrouillage soit soumis a une force de rotation predeterminee et soit deplace vers une position active.
PCT/SE1980/000243 1980-10-06 1980-10-06 Dispositif de securite de detonateur Ceased WO1982001244A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE1980/000243 WO1982001244A1 (fr) 1980-10-06 1980-10-06 Dispositif de securite de detonateur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
WOSE80/00243801006 1980-10-06
PCT/SE1980/000243 WO1982001244A1 (fr) 1980-10-06 1980-10-06 Dispositif de securite de detonateur

Publications (1)

Publication Number Publication Date
WO1982001244A1 true WO1982001244A1 (fr) 1982-04-15

Family

ID=20339958

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1980/000243 Ceased WO1982001244A1 (fr) 1980-10-06 1980-10-06 Dispositif de securite de detonateur

Country Status (1)

Country Link
WO (1) WO1982001244A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2446545A (en) * 1945-04-17 1948-08-10 James F Mecaslin Delay arming device
CH419909A (fr) * 1965-03-18 1966-08-31 Industrial Holding Ets Fusée de projectile
US3416894A (en) * 1955-02-16 1968-12-17 Army Usa Setback responsive arming device
SE389395B (sv) * 1970-11-03 1976-11-01 Mefina Sa Sekerhetsanordning for ett tendror hos en roterande projektil.
DE2643828A1 (de) * 1976-09-29 1978-03-30 Junghans Gmbh Geb Zuender fuer drallarm zu verschiessende geschosse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2446545A (en) * 1945-04-17 1948-08-10 James F Mecaslin Delay arming device
US3416894A (en) * 1955-02-16 1968-12-17 Army Usa Setback responsive arming device
CH419909A (fr) * 1965-03-18 1966-08-31 Industrial Holding Ets Fusée de projectile
SE389395B (sv) * 1970-11-03 1976-11-01 Mefina Sa Sekerhetsanordning for ett tendror hos en roterande projektil.
DE2643828A1 (de) * 1976-09-29 1978-03-30 Junghans Gmbh Geb Zuender fuer drallarm zu verschiessende geschosse

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