Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
  • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
  • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
  • F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
  • F42B12/56—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing discrete solid bodies
  • F42B12/58—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles
  • F42B12/62—Cluster or cargo ammunition, i.e. projectiles containing one or more submissiles the submissiles being ejected parallel to the longitudinal axis of the projectile

Definitions

• the field of the present invention is that of wedging devices for submunitions placed inside the shell of a projectile. It is known to design projectiles intended to transport submunitions. These projectiles can be of the artillery shell, missile, rocket or mortar projectile type.
• Such a projectile comprises a pyrotechnic charge which is initiated when it arrives near its objective and which causes the ejection of the submunitions from its envelope.
• the submunitions can be of the anti-personal or anti-tank type, when they have a diameter less than the internal diameter of the envelope, the problem arises of their radial setting relative to the latter.
• the projectile must be able to withstand the mechanical stresses which are occasioned by transport, handling and above all shooting, without this resulting in deterioration of the submunitions.
• US patent 793260 describes an artillery cargo shell which transports anti-tank bombs. The latter are wedged relative to the envelope by means of inserts. Each insert has concave surfaces which are in contact with two adjacent bombs and it also has a convex surface which is in contact with the internal surface of the shell of the shell.
• the shell contains several "layers" of bombs stacked axially, and each layer is wedged relative to the envelope by a set of six inserts.
• the subject of the invention is a device for wedging submunitions inside the envelope of a projectile, a device made up of bars regularly distributed angularly, each bar having a bearing surface intended to come into contact with an internal surface of the envelope and two holding surfaces intended to come into contact with at least two adjacent submunitions, this device is characterized in that each bar is divided into at least two half-bars which are in mutual contact at the level at least one inclined guide surface, surface such that it allows, by relative sliding of each half-bar, to separate the two holding surfaces so as to catch up with a radial clearance of assembly of the submunitions in 1 'envelope.
• each half-bar is formed by the assembly of at least two identical elementary blocks, each elementary block comprising a bearing surface, a holding surface and a guide surface.
• the elementary blocks constituting a half-strip are assembled by means of pins and holes carried by their end surfaces.
• the elementary blocks may be identical on the two half-bars.
• each block may carry a pin arranged at its guide surface.
• This pin is intended to come into a housing carried by the guide surface of another block, the pins and housings making it possible to assemble the two half-bars, in a relative position such that the distance between the holding surfaces of the bar thus formed is minimal.
• the bars are preferably made of plastic.
• FIG. 1 represents in axial section an artillery cargo shell transporting sub- ammunition of the anti-tank bomb type, shell equipped with a chocking device according to the invention
• FIG. 2 is a cross-sectional view of this shell
• FIGS. 3a and 3b are two views of one of the elementary blocks, the assembly of which makes it possible to constitute a wedging bar according to the invention, FIG. 3b being a view of FIG. 3a in the direction A, - FIGS. 4a and 4b show how the various elementary blocks are positioned so as to constitute a bar, FIGS. 5a and 5b show an assembled bar. It is represented in FIG. 5a in its initial state, state in which it has a minimum width allowing it to be placed in the shell. It is represented in FIG. 5b in its chocking state, a state in which its width is maximum and makes it possible to make up for the assembly clearance of the submunitions.
• a cargo shell 1 transports submunitions, of the anti-tank "bomblet" type 2 arranged inside an envelope 3.
• the envelope 3 is closed at one end by a warhead 4 and at the other end by a base 5.
• a rocket 6, of the chronometric type, is intended to initiate a pyrotechnic charge 7 generating gas.
• the charge 7 is separated from the bombs 2 by a piston 8.
• the envelope 3 carries at its rear part a belt 26 which makes it possible to ensure scratching when firing inside the barrel of a weapon (not shown).
• a belt 26 which makes it possible to ensure scratching when firing inside the barrel of a weapon (not shown).
• the gases generated then exert a pressure on the piston 8, which causes the separation of the base 5 and the envelope 3, then the ejection of the bombs 2 from the envelope.
• the shell carries nine rows of seven bombs.
• the bombs are fitted into each other at their hollow charge coatings (not shown).
• FtUILLEDEREMPLACEMENT (RULE26) They are regularly distributed angularly and are held relative to the casing 3 by a wedging device.
• the wedging device according to the invention consists of five bars 9 regularly angularly distributed.
• Each bar 9 has a bearing surface 10 intended to come into contact with an internal surface of the envelope 3. It also includes two holding surfaces 11
• the bars extend substantially over the entire height of the bomb load, that is to say from the base 5 to the piston 8.
• a metal longitudinal key 24 completes the bars and makes it possible to drive all of the bombs in rotation by the casing 3.
• This key extends over substantially the entire height of the load of bombs, say from the base 5 to the piston 8. It has an external profile similar to that of a bar and thus comprises a bearing surface with the casing 3 and surfaces for holding in contact with adjacent bombettes.
• the key has a tenon 25 which is housed in a groove on the casing and allows the bombs to rotate.
• Each bar is divided into at least two half-bars 9a, 9b which have particular contact surfaces as will be described below.
• Each half-bar is formed by the longitudinal assembly of blocks 12 which are all identical.
• Each block 12 here has substantially the length of two bombs.
• the constitution of the bars by means of elementary blocks makes it possible to make with these same blocks bars of different lengths which can be suitable for projectiles carrying different quantities of bombs.
• Figures 3a and 3b show an elementary block 12 in two orthogonal views.
• This block has a slightly convex profile whose radius is equal to the internal radius of the envelope 3.
• This profile is identified at 10, the juxtaposition of the convex profiles of the different blocks constitutes the bearing surface 10 of the bar. It also has a concave profile whose radius is equal to that of a bomb.
• This profile is identified at 11, the juxtaposition of the concave profiles of the different blocks constitutes one of the holding surfaces 11 of the bar.
• the retaining surface 11 has longitudinal grooves 13 with a triangular profile and which extend over the entire length of the block 12. These grooves are intended to deform during the setting of the bombettes, which ensures good blocking of the bombettes whatever the actual dimensions of the latter within their range of dimensional tolerances.
• the block 12 also includes end faces 14 and 15 at which the assembly is carried out with other blocks in order to constitute a half bar.
• the end face 15 carries a stud 16 and the end face 14 has a hole 17.
• the stud 16 is intended to be housed in a hole 17 carried by a second block, the hole 17 is intended to receive the stud 16 of a third block.
• the block 12 comprises two lateral faces 18 and 19, mutually parallel and substantially perpendicular to the end faces 14 and 15.
• the block 12 finally comprises a guide surface 20 which is inclined relative to the axis of the concave surface 11. This inclined surface extends from the end surface 15 to a recess 21.
• the inclined surface 20 carries a pin 22 and a housing 23, these two elements are intended, as will be explained later, to allow the temporary assembly of two half bars.
• the block 12 is made of plastic, for example of the Polyamide 6 or polyamide 6-6 type (products sold under the brand "Nylon").
• the material of the bar will favor the sliding of the blocks at their guide surfaces 20. All the shapes are obtained during the injection of this material, in particular the stud 16, the pin 22, the hole 17 and the housing 23.
• the block has a thickness of material which is substantially constant over its entire geometry and comprises spacer partitions 27 which ensure its rigidity.
• Figures 4a and 4b show ten blocks 12 which are arranged so as to allow their assembly to constitute a complete strip.
• each half-bar is carried out by means of the pins 16 and of the holes 17.
• the assembly of the two half-bars together is carried out by means of the pins 22 and the housings 23.
• each block 12 serves as an abutment surface for the end surfaces 14 of the various blocks, the lateral surfaces 19 of the blocks of each half-bar are then in mutual contact.
• the bar 9 thus obtained is shown in Figure 5a. Due to the geometry of the blocks 12, the assembled bar has a relative axial offset of the half bars 9a and 9b, this offset has the length of that of the lateral surface 19.
• the width of the bar 9 is shown in Ll it has the value double the distance separating the lateral surfaces 18 and 19 of each block.
• This configuration of the bar 9 is that of its "initial state", a state in which it has a minimum width allowing it to be placed in the shell.
• This configuration of the bar 9 is that of its "chocking state", a state in which its width is maximum and makes it possible to make up for the radial clearance of assembly of the bombettes.
• the width of the bar 9 is then shown in L2 and it is a few millimeters greater than the initial value L1.
• L2 depends on the slope of the guide surface 20, it is possible to give this slope a value enabling the radial clearance of the assembly of the bombettes to be taken up.
• the wedging device according to the invention makes it possible to considerably simplify the positioning of the bombettes inside the shell.
• FIG. 6a represents the rear of a cargo shell inside which the bombs 2 and the various bars 9 are placed in their "initial state”.
• the cargo shell is then placed below a compression tool which comprises a disc intended to come to exert a force on all the projecting parts of the bars 9 (on the rear faces 14 of each bar).
• the bars therefore all adopt their "setting state" at the same time.
• FIG. 6b represents the rear of a cargo shell inside which the bombs 2 and the various bars 9 are placed in their "stalling state”. Next, an axial wedge washer for loading the shell is positioned, then the closing base.
• a single compression operation is therefore necessary to ensure the radial wedging of the load instead of six to nine operations for wedging systems according to the state of the art.
• chock device for any projectile intended to transport submunitions.
• This device may in particular be used in missiles, rocket or mortar projectile type.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• General Engineering & Computer Science (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)
• Sub-Exchange Stations And Push- Button Telephones (AREA)
• Photoreceptors In Electrophotography (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)
• Toys (AREA)
• Steering Devices For Bicycles And Motorcycles (AREA)
• Buckles (AREA)
• Package Frames And Binding Bands (AREA)
• Nitrogen Condensed Heterocyclic Rings (AREA)
• Turbine Rotor Nozzle Sealing (AREA)
• Catching Or Destruction (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Vehicle Body Suspensions (AREA)
• Soil Working Implements (AREA)
• Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9444720

Family Applications (1)

Country Status (10)

Families Citing this family (5)

Family Cites Families (8)

• 1993
  • 1993-03-08 FR FR9302614A patent/FR2702557B1/fr not_active Expired - Fee Related
• 1994
  • 1994-01-28 EP EP94905749A patent/EP0643821B1/de not_active Expired - Lifetime
  • 1994-01-28 AT AT94905749T patent/ATE161625T1/de not_active IP Right Cessation
  • 1994-01-28 DE DE69407521T patent/DE69407521T2/de not_active Expired - Fee Related
  • 1994-01-28 ES ES94905749T patent/ES2112519T3/es not_active Expired - Lifetime
  • 1994-01-28 WO PCT/FR1994/000104 patent/WO1994020817A1/fr active IP Right Grant
  • 1994-01-28 US US08/325,275 patent/US5473988A/en not_active Expired - Fee Related
  • 1994-03-01 IL IL108793A patent/IL108793A/en not_active IP Right Cessation
  • 1994-11-07 NO NO944235A patent/NO303090B1/no unknown
  • 1994-11-08 FI FI945258A patent/FI945258A/fi unknown

Non-Patent Citations (1)

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