U.S. patent application number 13/066961 was filed with the patent office on 2012-03-15 for vehicle protection method.
Invention is credited to Michael D. Farinella, Thomas F. Hafer, Loren Howard, Christopher Moeller, Scott La Valley.
Application Number | 20120060677 13/066961 |
Document ID | / |
Family ID | 38332669 |
Filed Date | 2012-03-15 |
United States Patent
Application |
20120060677 |
Kind Code |
A1 |
Farinella; Michael D. ; et
al. |
March 15, 2012 |
VEHICLE PROTECTION METHOD
Abstract
A structure or vehicle protection method including a removable
frame on the structure or vehicle, and a net within the frame and
spaced from the structure or vehicle and having a mesh size
designed to disarm an incoming threat.
Inventors: |
Farinella; Michael D.;
(Belmont, MA) ; Hafer; Thomas F.; (Arlington,
VA) ; Moeller; Christopher; (Nashua, NH) ;
Howard; Loren; (Waban, MA) ; Valley; Scott La;
(Marlborough, MA) |
Family ID: |
38332669 |
Appl. No.: |
13/066961 |
Filed: |
April 28, 2011 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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12806724 |
Aug 19, 2010 |
8042449 |
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13066961 |
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11351130 |
Feb 9, 2006 |
7866250 |
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12806724 |
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Current U.S.
Class: |
89/36.02 ;
89/36.01; 89/918; 89/920; 89/930 |
Current CPC
Class: |
F41H 5/026 20130101;
F41H 11/02 20130101 |
Class at
Publication: |
89/36.02 ;
89/36.01; 89/918; 89/920; 89/930 |
International
Class: |
F41H 5/06 20060101
F41H005/06; F41H 5/24 20060101 F41H005/24; F41H 5/04 20060101
F41H005/04; F41H 5/00 20060101 F41H005/00 |
Goverment Interests
GOVERNMENT RIGHTS
[0002] This invention was made with U.S. Government support under
DARPA contract No. HR0011-05-C-0056. The Government may have
certain rights in the subject invention.
Claims
1. A method of defeating an RPG, the method comprising: attaching a
frame to a vehicle or structure in a spaced relationship with
respect to the vehicle or structure; attaching a net made of
synthetic line to the frame, the net having a mesh size and
configured such that when an RPG ogive impacts the net, the net
material collapses the RPG ogive duding the RPG; and whereby when
an RPG impacts the net material, the net material collapses the RPG
ogive duding the RPG.
2. The method of claim 1 in which a net mesh size between 30-60 mm
is chosen.
3. The method of claim 1 in which a knotless weave of the line is
chosen.
4. The method of claim 1 in which the line is made of PBO
material.
5. The method of claim 1 in which the net line diameter is between
0.5-3 mm.
6. The method of claim 1 including attaching two or more nets on
the frame.
7. The method of claim 6 in which there is at least a first layer
of smaller diameter line material and a layer of larger diameter
line material.
8. The method of claim 7 in which there are between 2-4 layers of
smaller diameter line material over a single layer of larger
diameter line material.
9. The method of claim 1 in which the net frame is attached between
8''-48'' from the vehicle or structure.
Description
RELATED APPLICATIONS
[0001] This application is a divisional application which claims
the benefit of and priority to U.S. patent application Ser. No.
12/806,724 filed Aug. 19, 2010, which is a divisional application
of Ser. No. 11/351,130, filed Feb. 9, 2006, under 35 U.S.C.
.sctn..sctn.119, 120, 363, 365, and 37 C.F.R. .sctn.1.55 and
.sctn.1.78 and which are incorporated into this application by this
reference.
FIELD OF THE INVENTION
[0003] This subject invention relates to counter measure systems
and, in particular, to an easy to install, fairly inexpensive, and
more effective vehicle protection system.
BACKGROUND OF THE INVENTION
[0004] Rocket Propelled Grenades (RPGs) and other threats used by
enemy forces and insurgents are 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.
There are a variety of RPG warhead types, but the most prolific are
the RPG-7 and RPG-7M which employ a focus blast or shaped charge
warhead capable of penetrating considerable armor even if the
warhead is detonated at standoffs up to 10 meters from a vehicle. A
perfect hit with a shaped charge can penetrate a 12 inch thick
steel plate. RPG's pose a persistent deadly threat to moving ground
vehicles and stationary structures such as security check
points.
[0005] Heavily armored, lightly armored, and unarmored vehicles
have been proven vulnerable to the RPG shaped charge. Pick-up
trucks, HMMWV's, 21/2 ton trucks, 5 ton trucks, light armor
vehicles, and M118 armored personnel carriers are frequently
defeated by a single RPG shot. Even heavily armored vehicles such
as the M1 Abrams Tank have been felled by a single RPG shot. The
RPG-7 and RPG-7M are the most prolific class of RPG weapons,
accounting for a reported 90% of the engagements. RPG-18s have been
reported as well accounting for a significant remainder of the
threat encounters. Close engagements 30 meters away occurs in less
than 0.25 seconds and an impact speed ranging from 120-180 m/s.
Engagements at 100 meters will reach a target in approximately 1.0
second and at impact speeds approaching 300 m/s.
[0006] 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 in even in
churches.
[0007] Armor plating on a vehicle does not always protect the
vehicle's occupants in the case of an RPG impact and no known
countermeasure has proven effective.
[0008] Certain prior art discloses the idea of deploying an airbag
(U.S. Pat. No. 6,029,558) or a barrier (U.S. Pat. No. 6,279,449) in
the trajectory path of a munition to deflect it but such
countermeasure systems would be wholly ineffective in the face of a
RPG.
[0009] Other prior art discloses systems designed to intercept and
destroy an incoming threat. See, e.g., U.S. Pat. No. 5,578,784
which discloses a projectile "catcher" launched into the path of a
projectile. Many such interception systems are ineffective and/or
expensive, complex, and unreliable.
SUMMARY OF THE INVENTION
[0010] It is therefore an object of this invention to provide a
more effective and reliable protection system for vehicles and
structures.
[0011] It is a further object of this invention to provide such a
system which is fairly simple in design, easy to install and
remove, and which is inexpensive.
[0012] The subject invention results from the realization that a
more effective and reliable protection system is effected by a
shield typically deployable outward from a vehicle or structure
when an incoming RPG or other threat is detected and designed to
disarm the threat instead of deflect or intercept and destroy the
threat.
[0013] The subject invention, however, in other embodiments, need
not achieve all these objectives and the claims hereof should not
be limited to structures or methods capable of achieving these
objectives.
[0014] This invention features a protection system for a vehicle or
other structure. In one embodiment, there is a sensor subsystem for
detecting an incoming threat, a flexible packaged net with
perimeter weighting housed in a deployment box attached to the
vehicle, a deployment subsystem including an airbag packaged in the
deployment box behind the net, and a fire control subsystem,
responsive to the sensor subsystem, configured to activate the
deployment subsystem to inflate the airbag and deploy the net in
the trajectory path of the incoming threat.
[0015] In one example, the sensor subsystem includes a radar
system. Preferably, the threat has a nose diameter less than its
body diameter and the net has a mesh size between the body diameter
and the tail diameter, typically between 30-60 mm. Preferably, the
net has a knotless weave. The net can be made of PBO material and
may have a line diameter of 0.5-3 mm.
[0016] Typically, the airbag is mounted centrally in the box, the
perimeter weighting is located over the airbag, and the remainder
of the net is folded adjacent the sides of the airbag. The
deployment box then defines a concave compartment for the remainder
of the net around the airbag.
[0017] The net may be attached to the deployment box or not. There
may be two or more nets packaged in the deployment box with their
mesh aligned or not depending on the specific implementation. The
preferred net may include at least one layer of smaller diameter
line material and a layer of larger diameter line material.
Typically, there are between 2-4 layers of smaller diameter line
material over a single layer of larger diameter line material.
[0018] One protection system in accordance with this invention
includes a sensor subsystem for detecting an incoming threat, a
flexible packaged net in a deployment box attached to a structure,
a deployment subsystem packaged in the deployment box, and a fire
control subsystem, responsive to the sensor system, configured to
activate the deployment system to deploy the net into the
trajectory path of the incoming threat. One example of a deployment
subsystem is an airbag packaged in the deployment box behind the
net. The fire control subsystem is configured to activate the
deployment subsystem to inflate the airbag and deploy the net.
Another example of a deployment subsystem includes rockets attached
to the net. The fire control subsystem is configured to fire the
rocket to deploy the net. Another deployment subsystem includes
spring loaded folded actuators configured to deploy the net as the
actuators are released.
[0019] In another embodiment, the protection system includes a
frame on a structure and a net on the frame spaced from the
structure and having a mesh size designed to disarm an incoming
threat. Typically, the net mesh size is between 35-60 mm. The
preferred net has a knotless "ultracross" weave. There may be two
or more nets on the frame with their mesh aligned or not.
[0020] A protection system in accordance with this invention may be
characterized as including, inter alia, flexible means for
disarming an incoming threat and means for deploying said flexible
means into a spaced relationship with a structure. In the preferred
embodiment, the flexible means includes a net. In one example, the
means for deploying includes an airbag. In another example, the
means for deploying includes rockets. In still another example, the
means for deploying is a static frame attached to the
structure.
[0021] In a more comprehensive sense, one protection system in
accordance with this invention features a mobile vehicle including
sensor subsystem for detecting an incoming threat. A deployment box
is removably attached to the vehicle. The deployment box includes
therein a flexible packaged net with perimeter weighting, and a
deployment subsystem including an airbag is packaged in the
deployment box behind the net. A fire control subsystem is
responsive to the sensor subsystem and is configured to activate
the deployment subsystem to inflate the airbag and deploy the net
in the trajectory path of the incoming threat.
[0022] Another protection system for a threat having a nose
diameter less than its body diameter includes a mobile vehicle with
a frame releasably attached to the vehicle. A net on the frame is
spaced from the vehicle and has a mesh size between the threat nose
diameter and the body diameter to disarm the threat.
[0023] One preferred protection system includes a flexible packaged
net including at least two layers of a small line diameter net over
at least one layer of a larger line diameter net and a deployment
subsystem for deploying the net. One deployment subsystem includes
an airbag. Another deployment subsystem includes rockets. Still
another deployment subsystem includes a static frame for the net.
Still another deployment subsystem includes actuator members.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Other objects, features and advantages will occur to those
skilled in the art from the following description of a preferred
embodiment and the accompanying drawings, in which:
[0025] FIG. 1 is a schematic cross-sectional side view of one
embodiment of a protection system in accordance with the subject
invention featuring a flexible packaged net deployed by an
airbag;
[0026] FIG. 2 is a schematic three-dimensional rear view showing an
example of the airbag inflated and the net deployed;
[0027] FIG. 3 is a schematic side view of the inflated airbag and
the net shown in FIG. 2;
[0028] FIG. 4 is another schematic three-dimensional rear view
similar to FIG. 2 except now the net remains attached to a
deployment box affixed to the vehicle;
[0029] FIG. 5 is a schematic three-dimensional view showing in more
detail how the flexible net of FIGS. 1-4 disables an RPG in
accordance with subject invention;
[0030] FIG. 6 is a schematic highly conceptual side view of the RPG
being damaged by the net shown in FIG. 5;
[0031] FIG. 7 is a schematic block diagram depicting the primary
subsystems associated with a typical protection system in
accordance with the subject invention;
[0032] FIG. 8 is a block diagram showing the primary components
associated with the vehicle protection system shown in FIGS.
1-4;
[0033] FIG. 9 is a schematic three-dimensional side view showing
another embodiment of a protection system in accordance with the
subject invention;
[0034] FIGS. 10A-10E are highly schematic three-dimensional views
showing still another embodiment of a protection system in
accordance with the subject invention;
[0035] FIG. 11 is a schematic conceptual view of the system shown
in FIGS. 1-3;
[0036] FIG. 12 is a schematic conceptual view of the system shown
in FIG. 10;
[0037] FIG. 13 is another schematic conceptual view of the system
shown in FIG. 10;
[0038] FIGS. 14-15 are schematic three-dimensional conceptual views
of a protection system in accordance with this invention where
actuator members are used to deploy a net; and
[0039] FIG. 16 is a schematic view of one preferred embodiment of a
net system in accordance with this invention.
DISCLOSURE OF THE PREFERRED EMBODIMENT
[0040] Aside from the preferred embodiment or embodiments disclosed
below, this invention is capable of other embodiments and of being
practiced or being carried out in various ways. Thus, it is to be
understood that the invention is not limited in its application to
the details of construction and the arrangements of components set
forth in the following description or illustrated in the drawings.
If only one embodiment is described herein, the claims hereof are
not to be limited to that embodiment. Moreover, the claims hereof
are not to be read restrictively unless there is clear and
convincing evidence manifesting a certain exclusion, restriction,
or disclaimer.
[0041] In one specific embodiment, a vehicle or structure
protection system in accordance with the subject invention includes
4'' deep, 141/2''.times.14'', 35 lb deployment box 10, FIG. 1
releasably attached to the exterior of vehicle or other structure
in any desired location. In this way, the protection system of this
invention can be used as desired on any vehicle configuration and
in any location on the vehicle. Box 10 houses airbag 12 and
flexible means such as net 14 with perimeter weights 16 and/or a
weighted perimeter line. Airbag 12 is inflated via gas generator 18
in a manner known to those skilled in the art via a signal on line
20 connected to electric trigger connector 22. Airbag 12 is
typically centrally mounted as shown and the net perimeter and
perimeter weights 16 are located over the airbag with the remainder
of the net folded in the concave compartment 24 about airbag 12.
Front covering 15 retains net 14 in aluminum box 10 until net 14 is
deployed. Front covering 15 may be a thin plastic film or in the
form of two hinged doors which open upon net deployment.
[0042] FIGS. 2-3 show deployment box 10 mounted to a door panel of
military vehicle 30 via straps and/or hook and loop fasteners and
airbag 12 inflated and net 14 deployed to its full extent (e.g.,
72'' long by 72'' wide) 36'' from vehicle 30 in the trajectory path
of threat 32, e.g., an RPG.
[0043] In this embodiment, net 14 is not attached to deployment box
10. FIG. 4 shows an embodiment where net 14' is attached to
deployment box 10 as does the embodiment shown and discussed below
with respect to FIG. 10.
[0044] In any embodiment, the deployment box can be attached to all
the door panels of vehicle 30, its roof, its hood, its front and
rear bumpers, and the like to provide complete vehicle
coverage.
[0045] As discussed above, net 14, FIG. 5 functions to disarm
threat 32 rather than to deflect or destroy it. Threat 32 has a
nose 40 with a diameter less than body portion 42 and the mesh size
of net 14 (typically 30-60 mm) is preferably tailored to capture
threat 32 and in so doing destroy, as shown at 48, the impact
fusing 50, FIG. 6 running just under the skin of threat 32 so that
when nose 40 strikes a target, the threat has now been disarmed and
the impact will not trigger detonation of the RPG explosive. The
ultralight net barrier collapses the RPG ogive, shorts its fuse,
and duds the round.
[0046] The preferred net has a knotless weave for increased
strength (e.g., an "ultracross" weave) and is made of "Dyneema" or
PBO (poly P-phenylene-2,6 bezibisoxazole) material with a line
diameter of between 0.5 mm to 3 mm. The net material, construction,
and line diameter may vary depending upon the specific
implementation, its location on the vehicle or structure, the
vehicle or structure type, and the different types of threats
likely to be encountered. "Net" as used herein, means not only
traditional nets but also scrims, fabrics with loose weaves, and
other structures designed to disarm incoming threats.
[0047] A complete system in accordance with one example of the
subject invention also includes a sensor subsystem 60, FIG. 7. In
the example shown in FIGS. 2-4, the sensor subsystem includes radar
system 70, FIG. 8 with antenna 72, FIGS. 2-4. Deployment subsystem
64, FIG. 7 is activated by fire control subsystem 62 which receives
a signal from sensor subsystem 60 indicating the presence of an
incoming threat. In the example of FIGS. 2-4, active deployment
subsystem 64, FIG. 7 includes gas generator 18 triggered by fire
control system 62 to inflate airbag 12 via connector 22, FIG. 1.
The deployed disarming shield subsystem includes airbag 12, net 14,
and optionally additional nets such as net 15 shown in phantom. The
mesh of these multiple nets may be aligned or overlapping as
desired when packaged in the deployment box and when deployed.
Preferably, the layers or plies of net material do not have their
openings aligned.
[0048] Those skilled in the art will appreciate that sensor
subsystem 60, FIG. 7 is not limited to radar based techniques. U.S.
Pat. Nos. 6,279,449 and 6,029,558, incorporated herein by this
reference, disclose Doppler radar systems but acoustic or optical
based sensors (see U.S. Pat. No. 5,578,784 also incorporated herein
by this reference) and other sensor subsystems are possible in
connection with the subject invention. Various fire control
circuitry and threat size and characterization systems are also
well known. Also, means other than an airbag used to deploy the net
are also possible in connection with the subject invention as
discussed below. Moreover, the system of this invention is intended
to work in combination with structures other than vehicles
including check point stations, bunkers, and other shelters.
[0049] FIG. 9 shows another embodiment of the subject invention
wherein removable static deployment frame 80 is attached to
military vehicle 30 via straps 82a-82d supporting shield 84 in a
spaced relation to vehicle 30, typically between 8''-48''. As with
the embodiment described above, shield 84 is configured to disarm
an incoming threat as discussed with reference to FIGS. 5-6. In one
preferred example, shield 84 is a net as described above. The frame
and net combination may be conveniently mounted on the sides of
vehicle 30, on its hood, on its roof, and also on the rear of
vehicle 30.
[0050] In still another example, the roof of vehicle 100, FIG. 10A
is equipped with deployment box 110 having a packaged net and
tractor thruster rockets tied to the bottom corners of the net
packaged therein. The top of the net is fixed to the deployment box
or vehicle. Upon detection of RPG 112, rockets 114a and 114b are
fired to deploy net 116, FIGS. 10B-10C. In FIG. 10D, RPG 112 has
struck net 116 and RPG 112 has been dudded. In FIG. 10E, RPG 112
has been diverted sideways and groundward.
[0051] FIG. 11 again shows a system described above with respect to
FIGS. 1-4 with deployment box 10 attached to a door of military
vehicle 30 and net 14 deployed. FIG. 12 again shows a system
described above with respect to FIG. 10 with deployment boxes 110a
and 110b located on the roof of military vehicle 110 and net 116
deployed from box 110a via rockets 114a and 114b. Sensor subsystem
60 (see FIG. 7) is also located on the roof of vehicle 100.
[0052] FIG. 13 shows how full vehicle coverage can be provided by
deployment boxes B located on the roof of a military vehicle an in
combination with sensor subsystems S.
[0053] FIGS. 14-15 show another type of deployment box 130 housing
a net and attached to vehicle 132. In this embodiment, the
deployment subsystem includes actuators 134a-g configured to deploy
nets 136a and 136b, FIG. 15. In one preferred embodiment, the
actuators are spring loaded to deploy the net as shown when the
actuators are mechanically released. The foldable members of
commonly owned U.S. Pat. No. 6,374,565, hereby incorporated herein
by this reference, may be included in the actuators 134a-g.
[0054] The preferred configuration of a net in any embodiment is
shown in FIG. 16 where a small diameter line net is folded to form
a plurality, for example, two to four (typically three) layers or
plies 150a, 150b, 150c laid over a single layer or ply of a larger
diameter line net 152.
[0055] The plies 150a-150b of net material include lines of PBO
material 0.9 mm diameter (braided, 4 ply, 35 mm mesh) and the
larger diameter line net 152 includes 3 mm diameter lines of PBO
material (braided, 28 ply, 45-55 mm mesh).
[0056] It was found in testing that folds of the smaller line
diameter net, in some cases, was sometimes pierced by a munition
without duding. Adding additional layers or plies would sometimes
result in the munition detonating on the net. A single layer larger
diameter line net could also result in the munition detonating upon
striking the net. But, surprisingly, when three layers of the
smaller line diameter net were added in front of a single layer of
the larger diameter line net, the munition did not pierce the net,
did not detonate upon striking the net, and was successfully duded.
It is believed this net system works well because the smaller
diameter line net layers affects the response of the piezo charge
generator of the munition and, when the munition then strikes the
larger diameter line net, it disarms the net as explained above
with reference to FIGS. 5-6 and/or the piezo charge generator,
affected by the smaller line diameter net layers, is unable to
generate a sufficient charge to detonate the munition. Also, it
appears the smaller line diameter net directs a hole in the larger
diameter line net to the munition nose and carries with it the
smaller line diameter net plies to move successfully dud the
munition.
[0057] In any embodiment, the result is a more effective and
reliable protection system which is fairly simple in design and
easy to install and which can also be manufactured fairly
inexpensively. Protection is effected by a shield typically
deployable or deployed outward from a vehicle or other structure
when an incoming RPG or other threat is detected. The shield is
designed primarily to disarm the threat instead of deflect or
intercept and destroy it.
[0058] Although specific features of the invention are shown in
some drawings and not in others, this is for convenience only as
each feature may be combined with any or all of the other features
in accordance with the invention. The words "including",
"comprising", "having", and "with" as used herein are to be
interpreted broadly and comprehensively and are not limited to any
physical interconnection. Moreover, any embodiments disclosed in
the subject application are not to be taken as the only possible
embodiments. Other embodiments will occur to those skilled in the
art and are within the following claims.
[0059] In addition, any amendment presented during the prosecution
of the patent application for this patent is not a disclaimer of
any claim element presented in the application as filed: those
skilled in the art cannot reasonably be expected to draft a claim
that would literally encompass all possible equivalents, many
equivalents will be unforeseeable at the time of the amendment and
are beyond a fair interpretation of what is to be surrendered (if
anything), the rationale underlying the amendment may bear no more
than a tangential relation to many equivalents, and/or there are
many other reasons the applicant can not be expected to describe
certain insubstantial substitutes for any claim element
amended.
* * * * *