WO2013112218A1 - Filet à pointes dures de partage de charge - Google Patents

Filet à pointes dures de partage de charge Download PDF

Info

Publication number
WO2013112218A1
WO2013112218A1 PCT/US2012/063256 US2012063256W WO2013112218A1 WO 2013112218 A1 WO2013112218 A1 WO 2013112218A1 US 2012063256 W US2012063256 W US 2012063256W WO 2013112218 A1 WO2013112218 A1 WO 2013112218A1
Authority
WO
WIPO (PCT)
Prior art keywords
net
rpg
vehicle
frame
hard
Prior art date
Application number
PCT/US2012/063256
Other languages
English (en)
Inventor
Michael Farinella
William Lawson
Scott Quigley
Robert Curran
Original Assignee
QinetiQ North America, Inc.
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
Priority claimed from US13/373,430 external-priority patent/US8607685B2/en
Application filed by QinetiQ North America, Inc. filed Critical QinetiQ North America, Inc.
Publication of WO2013112218A1 publication Critical patent/WO2013112218A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/013—Mounting or securing armour plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/023—Armour plate, or auxiliary armour plate mounted at a distance of the main armour plate, having cavities at its outer impact surface, or holes, for deflecting the projectile
    • F41H5/026—Slat armour; Nets

Definitions

  • the subject invention relates to ordnance shielding.
  • Rocket propelled grenades and other ordnance are used by terrorist groups to target military vehicles and structures. See WO 2006/134407 incorporated herein by this reference.
  • Others skilled in the art have designed intercept vehicles which deploy a net or a structure in the path of an RPG in an attempt to change its trajectory. See U.S. Patent Nos. 7.190.304; 6,957.602: 5,578.784: and 7.328,644 all incorporated herein by this reference.
  • Related prior art discloses the idea of deploying an airbag (U.S. Patent No. 6.029,558) or a barrier (U.S. Patent No. 6.279,499) in the trajectory path of a munition to deflect it. These references are also included herein by this reference.
  • Static armor such as shown in U.S. Patent Nos. 5.170,690: 5.191.166: 5.333.532; 4.928,575: and WO 2006/134,407 is often heavy and time consuming to install. When a significant amount of weight is added to a HMMWV, for example, it can become difficult to maneuver and top heavy. Such an armor equipped vehicle also burns an excessive amount of fuel.
  • Chain link fence type shields have also been added to vehicles.
  • the chain link fencing is not sufficiently compliant to prevent detonation of an RPG if it strikes the fencing material.
  • Chain like fencing although lighter than bar/slat armor, is still fairly heavy. Neither bar/slat armor nor the chain link fence type shield is easy to install and remove.
  • RPGs Grenades
  • Other threats used by enemy forces and insurgents remain a serious threat to troops on the battlefield, on city streets, and on country roads.
  • RPG weapons are relatively inexpensive and widely available throughout the world.
  • a perfect hit with a shaped charge can penetrate a 12 inch diick steel plate.
  • RPGs pose a persistent deadly threat to moving ground vehicles and stationary structures such as security check points.
  • the RPG-7 is in general use in Africa. Asia, and the Middle East and weapon caches are found in random locations making them available to the inexperienced insurgent. Today, the RPG threat in Iraq is present at every turn and caches have been found under bridges, in pickup trucks, buried by the road sides, and even in churches.
  • Armor plating on a vehicle does not always protect the occupants in the case of an RPG impact and no known countermeasure has proven effective.
  • Systems designed to intercept and destroy an incoming threat are ineffective and/or expensive, complex, and unreliable.
  • Patent No. 6,31 1.605 discloses disruptive bodies secured to armor. The disruptive bodies are designed to penetrate into an interior region of a shaped charge to disrupt the formation of the jet.
  • the shaped charge disclosed has a
  • a new vehicle and structure shield is provided which, in one specific version, is inexpensive, lightweight, easy to install and remove (even in the field), easy to adapt to a variety of platforms, effective, and exhibits a low vehicle signature.
  • Various other embodiments are within the scope of the subject invention.
  • a new vehicle and structure shield in one specific example, features a plurality of spaced rods or hard points held in position via the nodes of a net and used to dud an RPG or other threat allowing the frame for the net to be lightweight and inexpensive and also easily attached to and removed from a vehicle or structure.
  • the subject invention features a shield system for ordnance.
  • One preferred system includes a frame and a flexible net subsystem supported by the frame. Diagonal lines of net material intersect and connect at nodes form mesh openings and a hard point is pivotably attached to at least select nodes.
  • the net material preferably has a breaking strength such that a net line will break upon impact of an ordnance fuse with the line for a predetermined percentage of ordnance fuse impacts, for example between 80% and 100%. In one example where the line breaks 100% of the time (for an RPG-7 type ordnance.) the net material has a breaking strength of less than 500 lbs. In other examples, the breaking strength is between 100 lbs and 1.000 lbs.
  • the hard points each includes a post portion and a base portion with a cavity receiving the post portion therein.
  • each hard point includes a front face, sidewalls extending rearward from the front face including slots therethrough for lines of a net, a cavity surrounded by the sidewalls, and a plug sized to be frictionally received in the cavity locking the lines of the net in the cavity.
  • the plug may include an outer wall with a knurled surface.
  • the front face of each hard point has six sides there are six sidewalls. Two opposing sidewalls have slots therethrough in the middle of the opposing sidewalls. and there is a slot between adjacent sidewalls on each side of said two opposing sidewalls.
  • the hard points may include steel and weigh between 10 and 80 grams each.
  • the front face of each hard point has an area of between .1 and .8 in. 2
  • the sidewalls each have an area of between .1 and .8 in. 2
  • the cavity is round for a plug having a cylindrical shape.
  • the lines of the net may have a diameter of between 1.7 and 1.9 mm and the mesh openings can be between 110 mm and 190 mm.
  • the invention also features a method of fabricating a shield system.
  • the preferred method includes determining, for an ordnance, which net material has a breaking strength such that a net line will break upon impact of an ordnance fuse with a line for a predetermined percentage of ordnance fuse impacts, selecting net material having a breaking strength such that a net line will break upon impact of an ordnance fuse with the line for the predetermined percentage of ordnance fuse impacts, attaching hard points to the net. and attaching the net to a frame.
  • the predetermined percentage can be 100% or between 80% and 100%.
  • Selecting the net material may include choosing a net material with a breaking strength of between 100 lbs and 1 ,000 lbs.
  • Fig. 1 is a highly schematic three-dimensional exploded view showing an example of one shield protection system in accordance with the subject invention:
  • Fig. 2 is a schematic side view of a HMMWV vehicle equipped with hook and loop patches for installation of the shield system shown in Fig. 1 :
  • Fig. 3 is a schematic partial side view showing a shield subsystem in accordance with an example of the subject invention now installed on a portion of a vehicle;
  • Fig. 4 is a schematic three-dimensional front view showing one example of a hard point rod attached to adjacent nodes of two spaced nets in accordance with the subject invention
  • Fig. 5 is a schematic three-dimensional exploded view showing another example of a hard point rod in accordance with the subject invention
  • Figs. 6A-6D are schematic views of other hard point designs in accordance with examples of the subject invention:
  • Fig. 7A-7B are schematic views of a plug for the hard point shown in Figs. 6A-
  • Fig. 8 is a schematic three-dimensional front view showing a number of net shields removeably attached to a military vehicle in accordance with the subject invention:
  • Fig. 9 is a schematic three-dimensional side view showing a number of net shields attached to the side of a military vehicle
  • Fig. 10 is a highly schematic three-dimensional top view showing a RPG nose duded by the shield subsystem in accordance with the subject invention
  • Fig. 1 1 is a schematic three-dimensional exploded front view showing telescoping frame members in accordance with the subject invention:
  • Fig. 12A is a front view of a frame structure in accordance with an example of the invention.
  • Fig. 12B is a view of one portion of the frame structure shown in Fig. 12A;
  • Fig. 12C is a front view of one frame member of the frame structure shown in Fig. 12A showing a spiral wrap of Velcro material thereabout;
  • Fig. 13 is a partial schematic view showing a frame structure attached to the front of a vehicle in accordance with an example of the subject invention:
  • Fig. 14 is a flow chart depicting the primary steps associated with a method of protecting a vehicle or structure in one example of the invention:
  • Fig. 15 is a graph showing line strength and impact velocity for a number of live fire tests
  • Fig. 16 is a front view showing another embodiment of an ordnance shield subsystem in accordance with the subject invention:
  • Fig. 17 is a schematic front view showing still another embodiment of an ordinance shield subsystem in accordance with the subject invention:
  • Fig. 18 is another view of the net subsystem shown in Fig. 17;
  • Fig. 19 is a schematic three dimensional front view showing an example of an improved hard point in accordance with an example of the invention.
  • Fig. 20 is a schematic three dimensional rear view of the hard point shown in Fig.
  • Fig. 21 is a schematic cross sectional view of the hard point shown in Figs. 19 and
  • Fig. 22 is a schematic three dimensional front view of the plug portion of an improved hard point as depicted in Figs. 19-21;
  • Fig. 23 is a schematic side view of the tapered plug shown in Fig. 22.
  • Fig. 1 shows an example of flexible structures, e.g.. net subsystem 10 and including an array of rods or hard points 12 configured to impact a projectile (e.g., the nose of an RPG) striking net 14.
  • Frame 16 includes mounting brackets 18a-18d attached to rearwardly extending members 19a and 19b. The function of frame 16 and net 14 is to position rods 12 in a spaced relationship with respect to a vehicle or structure and to space the rods 12 apart from each other in an array.
  • rods 12 may angle inwardly towards the nose of the RPG tearing into it and duding the electronics and/or electrical or electronic signals associated with the arming or detonation mechanisms of the RPG.
  • flexible we generally mean a net which does not retain its shape unless supported in some fashion. When not attached to frame 16, net 14 can be rolled and then folded and/or net 14 can be bunched up.
  • net subsystem 10 is removeably secured to frame 16 and frame 16 is removeably secured to vehicle 20.
  • Fig. 2 e.g., a HMMWV vehicle.
  • frame members 22a-22d include hook type fasteners secured to the outside thereof and the net periphery includes loop type fasteners on the inside thereof. Loop type fasteners are also secured to the rear of frame 16 mounting brackets 18a- 18d and corresponding pads or patches 28a-28d.
  • Fig. 2. adhered to vehicle 20, include outer faces with hook type fasteners.
  • the hook and loop fastening mechanisms maybe reversed and other flexible fastener subsystems may also be used.
  • the hook and loop fastening subsystems of U.S. Patent Nos. 4.928,575: 5,170.690; 5,191 ,166: and 5.333.532 are preferred.
  • Fig. 3 shows frame members 22a and 22b including hook type fastener strips 30a and 30b. respectively, and net periphery fabric border 24 including loop type fastener strips 32a and 32b.
  • Mounting bracket 18c' is attached to rearwardly extending frame member 19a' and includes a rearward face with loop type fasteners.
  • Fig, 3 also shows optional strap 34 extending from ear 36 on frame member 22a to attachment 38 on vehicle 20 which may also be secured to vehicle 20 using hook and loop fasteners.
  • FIG. 3 also shows first (outer) net 40a and second (inner) net 40b with their nodes interconnected via rods 12'.
  • rod 12' includes base portion 50 and post portion 52 extending from base portion 50.
  • Post 52 includes castellations 54a- 54d for the line lines 56a and 56b of net 40a defining node 58.
  • base 50 includes castellations (e.g, castellations 60a and 60b) for lines 62a and 62b of net 40b also defining a node (not shown).
  • the lines of the nets may be glued or otherwise secured in the castellations.
  • Fig. 5 shows a single net design where net lines or strings 66a and 66b defining node 68 are secured between post portions 68 frictionally received in cavity 70 of base portion 72 of rod 12".
  • the preferred rod is made of steel, has a one inch post, and weighs between 15 and 30 grams.
  • Figs. 6A-6B shows hard point 12"' with forward facing base portion 72' with cavity 70' receiving post or plug 68', Fig. 7 therein in a friction fit manner. This hard point is designed for nets including intersecting lines connected at nodes. See Figs. 1 and 5.
  • a connected net node is received in cavity 70' while the net strings are received through slots 73a-d in wall 74 of hard point 72'.
  • the slots as shown for slot 73a. terminate in rounded portion 77 preventing wear of the net lines.
  • Wall 74 in this embodiment defines a six- sided structure with six sharp corners 75a-75f which dig into the skin of an RPG ogive.
  • Top surface 76 may be flat as shown or concave.
  • Slots 73a and 73c receive vertically extending line 66b, Fig. 5 while slots 73d and 73b, Fig. 6A receive horizontally extending line 66a. Fig. 5.
  • the hard point and the plug were made of steel, hard point 72' was 0.625 inches from one edge to an opposite edge, and 0.72 inches tall.
  • Cavity 70' was 0.499 inches in diameter and 0.34 inches deep.
  • Figs. 7A-7B was 0.35 inches tall, 0.500 inches in diameter, and includes knurling as shown at 78 on the outer wall surface thereof.
  • Side walls 74a-74f extend rearward from front face 76 defining cavity 70' surrounded by the side walls.
  • Opposing sidewalls 74a and 74d have slots (73a. 73c) in the middle of each side wall. Slots 73d, and 73b. in turn, are between adjacent sidewalls 74b and 74c and 74f and 74e. respectively.
  • Sidewall 74b and 74c arc between opposing sidewalls 74a and 74b on one side of member 72' while sidewall 74f and 74e are between opposing sidewalls 74a and 74d on the opposite side of member 72'.
  • the base portion 72' and plug 68' were made of hardened steel (e.g.. ASTM A108 alloy 12L14) and combined weighed between 10 and 80 grams.
  • a base portion with more or less sides is also possible.
  • the area of face 76, Fig. 6B. is typically about .5 in. 2 , e.g. between .1 and .8 in. 2 .
  • Sidewalls 74a-f typically have an area of .37 in. 2 , e.g., between .1 and .8 in. 2 .
  • Slots 73a - d may be .05-.15 inches wide and between .2 and .8 inches long.
  • a net node is placed in cavity 70'.
  • the hard points are typically made of conductive material and may include a protective rust resistant non-reflective, conductive coating (zinc plating, flat olive in color).
  • Geomet Coatings NOF Metal Coatings NA. Chardon, Ohio
  • base portion 72" weighed 30 grams and was machined from .625 hex bar stock. Walls 74a-74f were .72" tall. Slots 73a-73d were .080 inches across and .350" in length. These dimensions will vary, however, depending on the design of the net.
  • the aspect ratio of the hard points all play an important role. Hard points which are too large, for example, and a net mesh size which is too small, results in too much surface area to be stricken by an RPG, possibly detonating the RPG. Hard points which are too small may not sufficiently damage the RPG ogive and dud the RPG. Steel is a good material choice for the hard points because steel is less expensive. Tungsten, on the other hand, may be used because it is heavier and denser, but tungsten is more expensive. Other materials are possible. The hard points may be .5 inch to .75 inches across and between 0.5 inches and 1 inch tall.
  • the net node is placed at the center of gravity at the hard point.
  • the length of the hard point is preferably chosen so that when an RPG strikes the net. the pivotable hard point tumbles 90 degrees or so and digs into the RPG ogive. The moment of inertia of the hard point is designed accordingly. In still other designs, the hard point may have more or less than six sides.
  • the hard points may weigh between 10 to 80 grams although in testing 60 grams was found to be optimal, e.g., a 30 gram base portion and a 30 gram plug. Hard points between 10 and 40 grams are typical.
  • the net material may be polyester which provides resistance to stretching, ultraviolet radiation resistance, and durability in the Held. Kcvlar or other engineered materials can be used. A knotted, knolless. braided, or ultracross (knotless) net may be used. In this way, the intersecting lines of the net are connected at the net nodes.
  • the net material diameter may be 1.7 to 1.9 mm. Larger net lines or multiple lines arc possible, however, the design should be constrained to beneath threshold force to dynamic break loads typical of RPG impact and engagements.
  • the typical net mesh size may be 176 mm (e.g.. a square opening 88 mm by 88 mm) for a PG-7V RPG and 122 mm for a PG-7 VM model RPG. But, depending on the design, the net mesh size may range from between 1 10 and 190 mm.
  • the preferred spacing or standoff from the net to the vehicle is between 4 and 24 inches, (e.g., 6-12 inches) but may be between 4 and 60 centimeters. Larger standoffs may extend the footprint of the vehicle and thus be undesirable. Too close a spacing may not insure closing of the electrical circuitry of the RPG ogive by the hard points.
  • the frame and mounting brackets are designed to result in the desired spacing.
  • the net material and mesh size be chosen and the net designed such that an RPG ogive, upon striking a net line, does not detonate.
  • RPGs are designed to detonate at a certain impact force.
  • the breaking strength of the net line material is around 240 lbs so that an RPG. upon striking a string, does not detonate. Breaking strengths below about 1500 lbs are preferred.
  • the net is thus designed to be compliant enough so that it does not cause detonation of the RPG. Instead, the hard points dig into the RPG ogive and dud the RPG before it strikes the vehicle or structure.
  • This design is in sharp contrast to a much more rigid chain link fence style shield which causes detonation of the RPG if the RPG strikes a wire of the fence.
  • the overall result of the subject invention is a design with more available surface area where duding occurs as opposed to detonation.
  • Fig. 8 shows shields 80a-80f and the like protecting all of the exposed surfaces of vehicle 20.
  • Fig. 9 shows shields 82a-82d protecting the driver ' s side of vehicle 20. Only a few hard points 12"' are shown for clarity. Typically, there is a hard point at each node of the net.
  • Fig. 9 shows how frame members 22a' can comprise adjustable length telescoping sections for ease of assembly and for tailoring a particular frame to the vehicle or structured portion to be protected.
  • the frame members are made of light weight aluminum.
  • One complete shield with the net attached weighed 1.81bs.
  • the shield is thus lightweight and easy to assemble, attach, and remove. If a given shield is damaged, it can be easily replaced in the field.
  • the rods connected to the net cell nodes are configured to angle inwardly when an RPG strikes the net. This action defeats the RPG by duding it since the electronics associated with the explosives of the RPG are shorted as the rods impact or tear through the outer skin of the RPG ogive.
  • the result in one preferred embodiment is an inexpensive and light weight shielding system which is easy to install and remove.
  • the shields can be adapted to a variety of platforms and provide an effective way to prevent the occupants of the vehicle or the structure from injury or death resulting from RPGs or other ordnances.
  • the shield of the subject invention When used in connection with vehicles, the shield of the subject invention exhibits a low vehicle signature since it extends only a few inches from the vehicle.
  • the system of the subject invention is expected to meet or exceed the effectiveness of bar/slat armor and yet the flexible net style shield of the subject invention is much lighter, lower in cost, and easier to install and remove.
  • the system of the subject invention is also expected lo meet or exceed the effectiveness of chain link fence style shields and yet the net/hard point design of the subject invention is lower in cost, lighter and easier to install and remove.
  • FIG. 12A-12B One design of a frame 16, Figs. 12A-12B includes tubular upper frame member 100a, lower frame member 100b. and side frame members 100c and 100d all
  • comer members 102a-d interconnected via comer members 102a-d.
  • the result is a polygon with spaced sides and an upper and lower portion.
  • Spaced rearwardly extending members 104a and 104b are attached to the upper portion of the members 100d and 100c, respectively, just below the corner members 102a and 102b.
  • Rearwardly extending members 106a and 106b are on each side of the frame and each include a hinged joint 108a and 108b, respectively. Each of these members extends between a side member at the bottom of the frame and a rearwardly extending member at the top of the frame where they are hingely attached thereto. All of die hinged joints may be pin and clevis type joints as shown. As shown in Fig. 12C.
  • each frame member 100a- 100d includes a spiral wrap 110 of a hook type fastener material secured thereto to relcasably receive the loop type fastener material (32a. 32b. Fig. 3) of the net fabric border. In this way. the net is easily attached and removed from the frame.
  • the frame is attached lo the vehicle or structure using metal plates with an ear extending outwardly therefrom, such as plate 120.
  • Fig. 12b with ear 122 In other instances, however, features already associated with the vehicle or structure to be protected can be used to secured the frame with respect to the vehicle or structure.
  • FIG. 13 shows frame 16" attached to a vehicle.
  • Frame 16" includes frame members 130a-130g, rearward I y extending member 132a and 132b hingely connected to plates 134a and 134b, respectively, bolted to the vehicle.
  • Features 136a and 136b of vehicle 20' are connected to the joints between frame members 130b. 130g and 130f.
  • the frame, the mounting brackets, and the like may vary in construction depending on the configuration of the vehicle or structure to be protected, the location on the vehicle to protected and the like.
  • the frame members are tubular aluminum components and in one example they were 1-2 inches outer diameter, .75-1.75 inches inner diameter, and between 3 and 10 feet long.
  • Assembly of a vehicle or structure shield typically begins with cutting the bulk netting, step 200. Fig. 14 into square or rectangular shapes. Next a fabric border is sewed to the net edges, step 202 and includes loop type fastener material on at least one side thereof.
  • the hard points are they secured to the net nodes, step 204.
  • the net may be laid on a table and hard point female members 72'.
  • Fig. 6A-6B are positioned under each node with the net lines extending through slot 73a -73d.
  • Plugs 68'. Fig. 7 are then driven partly into each cavity of the female base portions using finger pressure and/or a hammer. Then, the plugs are seated in their respective cavities using a pneumatic driver.
  • step 206 The appropriate frame is then designed and assembled step 206, Fig. 14. and the hook fastener material is taped or glued to the frame members (see Fig. 12C), step 208.
  • the frame In the field, the frame is secured to the vehicle or structure, step 210, and the net is attached to the frame, step 212, using the loop type fastener material of the net periphery border and the hook fastener material on the frame members. Assembly of the frame to the vehicle or structure and releasably attaching the net to the frame is thus simple and can be accomplished quickly.
  • the net material and mesh size be chosen in the net design such that an RPG ogive, upon striking a net line, does not detonate.
  • RPGs are designed to detonate at a certain impact force.
  • the breaking strength of the net line material is designed such that an RPG, upon striking a net line or lines does not detonate.
  • Fig. 15 shows live fire RPG tests at nets with varying breaking strengths using a simulated RPG 7 test unit. Nets with lines having a breaking strength of below about 250 lbs resulted in no detonations of the RPGs when the RPG fuse struck a line between two nodes of the net. When the net material strength was about 1.000 lbs, in contrast, the RPG fuse was triggered approximately 10% of the time. A line strength above about 1.500 lbs, most RPG strikes resulted in detonation.
  • the net line strength for this particular RPG should be less than about 500 lbs resulting in approximately a 100% chance that the line will break upon impact of an RPG fuse with a net line. If higher net strength arc desired for a particular application, then a net line strength of 1 ,000 lbs should not be exceeded in order to insure a chance of between 80% and 100% that an RPG fuse impact with a net line will not cause detonation of the RPG fuse. Theoretically, a net line strength approaching 0 lbs is preferred to insure no RPGs will detonate when the nose fuse thereof strikes a net line. But. a net must support the hard points in an array in space and also must be sufficiently durable for various missions. So.
  • net line strengths of between about 200 lbs and 500 lbs results in a sufficiently durable net which does not cause detonation of an RPG when its nose fuse strikes a net line. Instead, the net line breaks. Surprisingly, even if this occurs, the hard points at the net interstices or nodes still dig into the RPG ogive and fairly reliably short the RPG fusing circuitry in a fairly effective manner. For other RPG models, the breaking strength of the net material may be a higher or low based on the fuse sensitivity and the desired percentage of strikes which will not cause detonation of an RPG.
  • a shield system for an RPG having a particular fuse sensitivity includes a frame, a flexible net subsystem supported by the frame wherein the flexible net subsystem includes lines of net material intersecting at nodes forming mesh openings and hard points attached to at least select nodes.
  • the net material is designed to have a breaking strength such that a line will break upon impact of an RPG fuse with the line for a predetermined percentage of RPG fuse impacts. In the example of an RPG 7, a breaking strength of approximately 500 lbs or less results in an almost 100% chance that the line will break upon impact of an RPG fuse with the line. In one example, net material was chosen such that it had a breaking strength of about 250 lbs.
  • a breaking strength of between 100 lbs - 500 lbs is preferred.
  • Net material having a breaking strength of between 500 lbs and 1,000 lbs results in a line breaking upon impact of an RPG 7 fuse with the line for between about 80% and 100% of RPG fuse impacts.
  • a method of fabricating an RPG shield system in accordance with the invention includes determining for an RPG (for example an RPG 7) which net material has a breaking strength such that a net line will break upon impact of an RPG fuse with the line for a predetermined percentage of RPG fuse impacts and then selecting the net material which has a breaking strength such that a line will break upon impact of an RPG fuse with the line for thai predetermined percentage of RPG fuse impacts.
  • Hard points are attached to selected net material nodes as discussed above and the net with the hard points attached thereto is attached to a frame as also discussed above.
  • Fig. 16 shows a design with a net 14 carrying hard points 12 and bordered by fabric border 24 secured to frame 22 to be fixed to and spaced from a vehicle or structure to be protected in a vertical orientation as shown and as discussed above.
  • the net strands run vertically and horizontally resulting in square or rectangular openings and a load 1
  • Fig. 17 and 18 show a new option wherein net 14' is made of diagonally extending intersecting lines (biased 45°, for example) as shown for lines 302 and 304 resulting in diamond shaped openings and strands which share the load due to the weight of the hard point(s).
  • loads l 2 and l 3 are each less than l 1 , Fig. 16.
  • the result is less likely breakage of lines 302 and 304 in the field for a given line strength as specified above.
  • the hard points 12. in this net design oscillated less (during vibration testing) resulting in a ten times improvement in performance.
  • the overall effectiveness of the net with diagonally extending intersecting lines connected at nodes received in the hard points is approximately the same as the vertically and horizontally extending designs discussed above but the net shown in Figs. 17 and 18 prove to be much more durable.
  • the same net material, mesh size, hard point design, and the like may be used as the designs discussed above, e.g., line 302 is between 55 and 95 mm long.
  • diagonally extending and intersecting lines as shown in Figs. 17 and 18 prevent the illusion that a trip wire or the like is across the road as was sometimes the case with the design of Fig. 16 attached to a vehicle in a soldier's line of sight.
  • a stepped hard point includes multi-sided body 400. Figs. 19-21 with a cavity 402 therein behind front face 404. Protrusion portion 406 extends outwardly from front face 404 resulting in multiple threat contact points P
  • Such a hard point can be machined from a piece of metal.
  • Other stepped body designs are possible.
  • a net node is placed in cavity 402, the lines of the net extend through slots 410a-410d in walls 412a-412d. respectively, and plug 414.
  • Figs. 22-23. is then presscd into cavity 402, Figs. 19-21 locking the net node in the cavity and securing the hard point to the node in a pivotable fashion whereupon contact points P 1 and/or P 2 are able to strike and dig into the ogive skin of an RPG. Note that if contact point P 2 first contacts the ogive's skin, the result is that the hard point turns inward on the net and now contact point P 1 may engage the ogive skin.
  • protrusion 40b is cylindrical in shape and has a diameter which spans the majority of face 404.
  • the protrusion was a solid cylindrical portion 0.600 inches in diameter and .250 inches long. Face 404 was .688 inches across. The hard point was .743 inches tall and thus had a length to diameter ratio of approximately 1 which increased the effectiveness of the system.
  • Body 400 had eight sides as shown rendering it symmetrical for ease of assembly since every other wall has a slot (410a-410d) in its middle. A symmetrical shape also increases the effectiveness of the hard points and now there are eight sharp edges available to dig into the ogive skin.
  • Solid plug 414 tapers as shown in Figs.
  • body 400 may include, in this design, optimal proximal lip 430 extending in to cavity 412 and plug 414, Figs. 22-23 includes reduced diameter proximal portion 432 defining ledge 420 engaged by lip 430, Figs. 20-21. This design also makes quality assurance inspections easier. Lip 430, in other examples, is not included.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Abstract

La présente invention se rapporte à un système de protection d'un équipement militaire, lequel système comprend un cadre et un sous-système de filet flexible supporté par le cadre. Des lignes diagonales du matériau de filet s'entrecroisent au niveau de nœuds qui forment des ouvertures de maille en forme de diamant, et une pointe dure est fixée au moins à des nœuds sélectionnés.
PCT/US2012/063256 2011-11-14 2012-11-02 Filet à pointes dures de partage de charge WO2013112218A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/373,430 2011-11-14
US13/373,430 US8607685B2 (en) 2008-04-16 2011-11-14 Load sharing hard point net

Publications (1)

Publication Number Publication Date
WO2013112218A1 true WO2013112218A1 (fr) 2013-08-01

Family

ID=48873798

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2012/063256 WO2013112218A1 (fr) 2011-11-14 2012-11-02 Filet à pointes dures de partage de charge

Country Status (1)

Country Link
WO (1) WO2013112218A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4950198A (en) * 1988-06-02 1990-08-21 Repko Jr Edward R Game call
US5007326A (en) * 1990-01-16 1991-04-16 The United States Of America As Represented By The Secretary Of The Army Cast single plate P900 armor
US5025707A (en) * 1990-03-19 1991-06-25 The United States Of America As Represented By The Secretary Of The Army High pressure gas actuated reactive armor
US20070180983A1 (en) * 2006-02-09 2007-08-09 Farinella Michael D Vehicle protection system
US7318258B2 (en) * 2005-05-06 2008-01-15 Huneed Technologies Co., Ltd. Clips having inflammable member inside thereof
US20100288114A1 (en) * 2007-07-13 2010-11-18 Soukos Konstantinos N Apparatus For Protecting A Target From An Explosive Warhead

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4950198A (en) * 1988-06-02 1990-08-21 Repko Jr Edward R Game call
US5007326A (en) * 1990-01-16 1991-04-16 The United States Of America As Represented By The Secretary Of The Army Cast single plate P900 armor
US5025707A (en) * 1990-03-19 1991-06-25 The United States Of America As Represented By The Secretary Of The Army High pressure gas actuated reactive armor
US7318258B2 (en) * 2005-05-06 2008-01-15 Huneed Technologies Co., Ltd. Clips having inflammable member inside thereof
US20070180983A1 (en) * 2006-02-09 2007-08-09 Farinella Michael D Vehicle protection system
US20100288114A1 (en) * 2007-07-13 2010-11-18 Soukos Konstantinos N Apparatus For Protecting A Target From An Explosive Warhead

Similar Documents

Publication Publication Date Title
US9441919B2 (en) RPG defeat method and system
EP2691730B1 (fr) Système et procédé de blindage à faible résistance à la rupture
US8443709B2 (en) Vehicle and structure shield hard point
CA2721701C (fr) Protection de vehicule et de structure
CA2855486C (fr) Protection de vehicule et de structure a points durs ameliores
US8453552B2 (en) Method of designing an RPG shield
US8607685B2 (en) Load sharing hard point net
US8677882B2 (en) Vehicle and structure shield with flexible frame
US10215536B2 (en) Hard point net
EP2885599A1 (fr) Véhicule et blindage de structure à châssis souple
WO2013112218A1 (fr) Filet à pointes dures de partage de charge

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12866835

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205 DATED 22/07/2014)

122 Ep: pct application non-entry in european phase

Ref document number: 12866835

Country of ref document: EP

Kind code of ref document: A1