Spin-stabilized non-lethal projectile with a shear-thinning fluid
First Claim
Patent Images
1. A cartridge comprising:
- a cartridge casing comprising a seating portion for receiving a projectile; and
the projectile received in the seating portion of the cartridge casing, the projectile comprising;
a frangible shell comprising a polymeric material having an interior cavity;
the frangible shell comprising a cylindrical portion, wherein the frangible shell is configured to engage rifling in a barrel so that the projectile spins when fired through the barrel; and
a shear-thinning fluid within the interior cavity, the shear-thinning fluid comprising an emulsifying agent chosen from glyceryl stearate, PEG-100 stearate, petrolatum, glycol strearate, and mixtures thereof;
wherein the shear-thinning fluid has a spin-stabilizing viscosity that is greater than an impact dispersing viscosity, such that the impact dispersing viscosity of the shear-thinning fluid decreases with the rate of shear at impact with a target, and the impact dispersing viscosity of the shear-thinning fluid is less than about 30 Pa·
s at a shear rate of about 50 Hz at about 25°
C., and the impact dispersing viscosity of the shear-thinning fluid is less than about 30 Pa·
s at shear rates greater than about 50 Hz at about 25°
C., and the spin-stabilizing viscosity of the shear-thinning fluid is greater than about 560 Pa·
s at shear rates less than about 2 Hz at about 25°
C. in order to spin-stabilize the projectile.
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Abstract
A non-lethal projectile having a shear-thinning fluid within an interior cavity. The shear-thinning fluid having a greater apparent viscosity at low shear rates to spin-stabilize the non-lethal projectile during flight and a lower apparent viscosity at a high shear rate corresponding with the shear-thinning fluid shearing against the frangible cap upon the non-lethal projectile striking the target, with the low viscosity of the shear-thinning fluid allowing proper dispersal upon impact with the target. The shear-thinning fluid can comprise a marking media and be in the form of an emulsion with less than about 50% liquid by volume to effectively disperse upon impact with the target.
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Citations
19 Claims
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1. A cartridge comprising:
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a cartridge casing comprising a seating portion for receiving a projectile; and the projectile received in the seating portion of the cartridge casing, the projectile comprising; a frangible shell comprising a polymeric material having an interior cavity; the frangible shell comprising a cylindrical portion, wherein the frangible shell is configured to engage rifling in a barrel so that the projectile spins when fired through the barrel; and a shear-thinning fluid within the interior cavity, the shear-thinning fluid comprising an emulsifying agent chosen from glyceryl stearate, PEG-100 stearate, petrolatum, glycol strearate, and mixtures thereof; wherein the shear-thinning fluid has a spin-stabilizing viscosity that is greater than an impact dispersing viscosity, such that the impact dispersing viscosity of the shear-thinning fluid decreases with the rate of shear at impact with a target, and the impact dispersing viscosity of the shear-thinning fluid is less than about 30 Pa·
s at a shear rate of about 50 Hz at about 25°
C., and the impact dispersing viscosity of the shear-thinning fluid is less than about 30 Pa·
s at shear rates greater than about 50 Hz at about 25°
C., and the spin-stabilizing viscosity of the shear-thinning fluid is greater than about 560 Pa·
s at shear rates less than about 2 Hz at about 25°
C. in order to spin-stabilize the projectile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A cartridge comprising:
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a cartridge casing comprising a seating portion for receiving a projectile; and the projectile received in the seating portion of the cartridge casing, the projectile comprising; a frangible polymeric shell having an interior cavity; the frangible shell comprising a cylindrical portion, wherein the frangible shell is configured to engage rifling in a barrel so that the projectile spins when fired through the barrel; and a shear-thinning fluid within the interior cavity; wherein the shear-thinning fluid has a spin-stabilizing viscosity that is greater than an impact dispersing viscosity, such that the impact dispersing viscosity of the shear-thinning fluid decreases with the rate of shear at impact with a target, and the impact dispersing viscosity of the shear-thinning fluid is less than about 30 Pa·
s at a shear rate of about 15 Hz at about 25°
C., and the impact dispersing viscosity of the shear-thinning fluid is less than about 30 Pa·
s at shear rates greater than about 15 Hz at about 25°
C., and the spin-stabilizing viscosity of the shear-thinning fluid is greater than about 130 Pa·
s at a first shear rate less than about 2 Hz at about 25°
C. in order to spin-stabilize the projectile.
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Specification
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Current AssigneeGeneral Dynamics OTS Incorporated (General Dynamics Corporation)
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Original AssigneeVista Outdoor Operations LLC (Vista Outdoor Inc.)
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InventorsCarlson, Erik K., Edel, Joshua L.
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Primary Examiner(s)Weber, Jonathan C
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Application NumberUS15/179,219Publication NumberTime in Patent Office543 DaysField of Search102367, 102370, 102498, 102502, 102513, 102529, 102430, 102439, 102444, 102501US Class CurrentCPC Class CodesF42B 10/26 using spin F42B10/04, F42B1...F42B 12/36 for dispensing materials; f...F42B 12/40 of target-marking, i.e. imp...F42B 12/74 of the core or solid bodyF42B 12/76 of the casingF42B 8/16 containing an inert filler ...
