US3605623A - Safety mechanism for rotary projectiles - Google Patents

Safety mechanism for rotary projectiles Download PDF

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Publication number
US3605623A
US3605623A US739846A US73984668A US3605623A US 3605623 A US3605623 A US 3605623A US 739846 A US739846 A US 739846A US 73984668 A US73984668 A US 73984668A US 3605623 A US3605623 A US 3605623A
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United States
Prior art keywords
lock
projectile
slide
projectiles
bore
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
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US739846A
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English (en)
Inventor
Paul Andre Theate
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.)
FN Herstal SA
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FN Herstal SA
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Filing date
Publication date
Application filed by FN Herstal SA filed Critical FN Herstal SA
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Publication of US3605623A publication Critical patent/US3605623A/en
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    • 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
    • F42C15/22—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 using centrifugal force
    • 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
    • F42C15/18—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved
    • F42C15/184—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved using a slidable carrier

Definitions

  • This invention relates to a safety mechanism for projectiles rotating about their axis during the flight thereof.
  • the object of the present invention is to prevent these drawbacks by providing a relatively very simple mechanism, wherein the release of a moving element bearing an element of the pyrotechnic train, the time at which this release occurs and the shifting of the said moving element in active position result from the centrifugal force created by the rotation of the equipped projectile about its axis during the flight.
  • the safety mechanism comprises substantially a slide hearing at least one element of the pyrotechnic train, said element moving in a direction perpendicular to the projectile axis, the shifting of the slide under the effect of the centrifugal force being momentarily prevented at least by a lock the withdrawal of which is actuated by the controlled shifting of a mass which, under the centrifugal force is carrying out a rotation and translation movement respectively about and along an axis situated in a plane perpendicular to that of the projectile.
  • FIG. 1 is an axial section of a mechanism according to the invention mounted within the body of a projectile;
  • FIG. 2 is a section along the line II-II of FIG. 1;
  • FIG. 3 is a section on an enlarged scale along the line III-III of FIG. 2;
  • FIGS. 4 and 5 are sections similar to that of FIG. 2, showing the mechanism according to the invention in two characteristic successive operating positions.
  • the mechanism 1 according to the invention is disposed in a housing 2 formed by the casing 3 of the projectile and a partition 4 to which mechanism 1 is fastened.
  • the mechanism 1 is housed in the bottom 5 of a casing the lid 6 of which carries a relay-charge 7 disposed upstream the main explosive charge 8.
  • the cylindrical bottom 5 is provided with a diametral groove 9 in which may shift a slide 10 hearing one element of the pyrotechnic train, namely the detonator 11.
  • This train is completed by a priming 12 disposed in a housing 13 provided in the said bottom 5 and approximately in the center thereof.
  • This slide 10 is normally brought to standstill in the position represented in FIG. 2 by a pair of diametrically opposite locks 14 and 15 engaging respectively notches 16 and 17 provided on the opposite side faces of the slide 10.
  • Each of said locks 14 and 15 is freely housed in a radial bore provided in the bottom 5 (1S and 19 respectively), said bores being coaxial.
  • each of the said locks is provided with a cylindrical mass 20 and 21 respectively which may slide in the corresponding bore like a piston.
  • the said locks are permanently actuated to their locking position by springs 22 and 23 bearing respectively, on one hand, upon the said masses 20 and 21, and on the other hand, upon the end of the screws 24 and 25 obturating the bores 18 and 19 respectively.
  • One of the said faces of the slide 10 is also provided with a notch 26 into which penetrates normally the end of a lock 27 carried at the end of a rod 28 passing through a hollow rod 29 coaxial with the latter.
  • One end of the said hollow rod 29 is threaded and is screwed in a threaded radial bore 30 provided in the said bottom 5.
  • the said bore 30 is extended outside the bottom 5 by a bore 31 having a larger diameter, which is, in turn, extended by an external chest 32.
  • the lock 27 is permanently actuated to its locking position by a spring 33 surrounding the said rod 28, housed in the hollow rod 29 and bearing upon the bottom 34 of the latter.
  • the free end of the rod 28 is provided with a washer 35 applied against the end of the hollow rod 29 and being outside the same when the lock 49 is in locking position, the diameter of the washer 35 being larger than the external diameter of the said rod 29.
  • the external cylindrical surface of rod 29 is provided with a thread under the form of a helical groove 36 engaged by the balls 37 of a nut 38 housed about the said rod 29 in the bottom of the bore 31 when the lock 27 is in locking position.
  • This nut has an annular shoulder 39 and it is normally brought to standstill at the bottom of the bore 31 by a lock 40 engaging the said shoulder 39, said lock projecting from the wall of the bore 31 and extending into a bore 41 perpendicular to the axis of the said bore 31.
  • the lock 40 is permanently actuated into its release position by a spring 42 bearing, on one end, upon the bottom of bore 41 and, on the other end, upon a head 43 integral with the said lock 40.
  • the above described mechanism operates as follows: at rest, the mechanism is in the position represented in FIG. 2 in which the slide 10 is maintained by locks 14 and 15 so that the detonator 11 lies out of alignment with the remaining pyrotechnic train consisting, on the one hand, of a relay-charge 7 and, on the other hand, of priming 12.
  • nut 38 is released and, under the action of the centrifugal force, it is shifted with a rotating movement along the hollow rod 28.
  • the mass of nut 38, the pitch of the helical groove 36 and the length of rod 29 are provided in accordance with the extent of the delay or the desired mouth safety so that the said nut pushes back the washer 35 and, hence, the lock 27 against the action of the spring 33 after this delay time.
  • the withdrawal of lock 27 causes the complete release of slide 10 which may then occupy the position represented in FIG. in which the detonator 11 is in alignment with the remaining pyrothechnic train.
  • the shifting of slide in groove 9 may be also used to provide additional safety functions.
  • the safety mechanism according to the invention is particularly designed for equipping a projectile provided with a target detecting unit together with a mechanism for correcting the trajectory by the lateral ejection of an added projectile.
  • the slide 10 may be also used as a safety switch for closing the electric priming circuits 12 of the detecting device and the priming circuits of the projectile correcting the trajectory (not shown) only when the projectile has travelled a distance corresponding to the required safety time.
  • deformable contacts the number of which depends upon the number of circuits being controlled and indicated jointly in 51, are disposed on both sides of the longitudinal symmetry plane of groove 9, whereas a small plate of insulating material 49 carrying conductors 50 connecting both opposite faces thereof is mounted at the end of the slide 10.
  • the small plate 49 comes between contacts 51 which are then closed by the respective conductors 50-.
  • the said contacts 48 may be provided with a plurality of teeth 51 cooperating with the corresponding notches 52 provided in the said conductors 50 or the small plate 49'. Alternately, an additional lock could also fulfil this function.
  • a safety mechanism for projectiles which rotate about their axis during flight, comprising a pyrotechnical train having two portions, a member carrying one of said portions and adapted to be shifted under the action of the centrifugal force during flight to bring said one portion into active position or alinement with the other portion, a lock preventing the shifting of said member up to the active position, means including a mass and causing controlled shifting of said mass along an axis under the centrifugal force at the initial stage of the flight for withdrawing said lock, and an electric circuit having contacts for closing the circuit, said member having a plate engaging said contacts and closing said circuit when said member reaches the active position.
  • a detonating fuse device for rotating projectiles comprising a pyrotechnical train having two portions, a slidable member carrying one of said portions and having an inactive position in which said one portion is out of alinement with the other portion, said member being shifted by centrifugal force caused by the rotation of the projectile in flight to an active position wherein said one portion is in alinement with the other portion, means responsive to the centrifugal force for locking said slidable member in said inactive position and delayedly unlocking said slidable member upon the firing of the projectile, and at least one electrical circuit, said means comprising a lock engaging said member in said inactive position, a mass, means guiding said mass radially to the axis of the projectile and causing the mass to carry out a translating and rotary movement while the mass is subjected to the centrifugal force and yielding abutment means located in the path of said mass and connected to said lock to withdraw said lock when engaged by said mass.
  • a detonating fuse device wherein said lock comprises an axially movable rod extending radially in the fuse device and having one end engaging a notch of said slidable member in the inactive position, the other end of said rod carrying said abutment means.
  • a detonating fuse device having a supporting part and wherein said guiding means comprise an externally threaded tube enclosing a portion of said rod between said abutment means and said supporting part.
  • a detonating fuse device wherein said mass has an axial bore traversed by said tube, said mass having means within said bore for engaging the external threads of said tube.
  • a detonating fuse device having spring means located within said tube and pressing said rod toward its locking position.
  • a detonating fuse device comprising electrically conductive contactor means carried by said slidable member and closing said electrical circuit when said member is in its active position.
US739846A 1967-07-10 1968-06-25 Safety mechanism for rotary projectiles Expired - Lifetime US3605623A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE701110 1967-07-10
BE47018 1967-07-10

Publications (1)

Publication Number Publication Date
US3605623A true US3605623A (en) 1971-09-20

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ID=33453168

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Application Number Title Priority Date Filing Date
US739846A Expired - Lifetime US3605623A (en) 1967-07-10 1968-06-25 Safety mechanism for rotary projectiles

Country Status (6)

Country Link
US (1) US3605623A (xx)
BE (1) BE701110A (xx)
DE (2) DE1703774A1 (xx)
ES (1) ES355975A1 (xx)
GB (1) GB1202473A (xx)
IL (1) IL30240A0 (xx)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2305677C2 (de) * 1973-02-06 1982-10-14 Diehl GmbH & Co, 8500 Nürnberg Sicherungsvorrichtung für einen Detonator eines Minenzünders
CN108480065B (zh) * 2018-06-07 2024-01-30 中国工程物理研究院总体工程研究所 动配平系统及具备动配平系统的离心机

Also Published As

Publication number Publication date
DE1998433U (de) 1968-12-12
GB1202473A (en) 1970-08-19
ES355975A1 (es) 1970-03-16
DE1703774A1 (de) 1972-04-06
BE701110A (xx) 1967-12-18
IL30240A0 (en) 1968-12-26

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