The invention relates generally to explosive ordnance disposal tools, and more particularly to a system for positioning a dearmer centrally in a gun barrel.
Explosive ordinance disposal (EOD) includes the removal of projectiles that have gotten stuck in the barrel of an artillery gun. When projectiles are stuck, EOD personnel generally place a dearmer barrel near the stuck projectile in the gun's barrel. A dearmer barrel houses an explosive that, when detonated, acts to dislodge the stuck projectile. Proper positioning of the dearmer barrel in the gun barrel is critical regardless of the gun barrel's caliber.
Accordingly, it is an object of the present invention to provide a dearmer positioning system.
Another object of the present invention is to provide a dearmer positioning system that is adaptable to a variety of gun barrel calibers.
Other objects and advantages of the present invention will become more obvious hereinafter in the specification and drawings.
In accordance with the present invention, a dearmer positioning system has two assemblies, each of which is adapted to circumscribe a dearmer. Each of the two assemblies includes two half rings and a one-piece outer ring. The two half rings are joined to one another to define a full ring having a central opening defining a first diameter. The full ring has a periphery defining a second diameter. The one-piece outer ring has a central opening defining a third diameter, and a periphery defining a fourth diameter. The third diameter is greater than the second diameter such that the full ring slidingly fits in the central opening of the outer ring. A plurality of threaded fasteners threadably engage the outer ring and are accessible from the periphery of the outer ring. Each threaded fastener extends radially through the outer ring and into its central opening to engage the periphery of the full ring.
Other objects, features and advantages of the present invention will become apparent upon reference to the following description of the exemplary embodiments and to the drawings, wherein corresponding reference characters indicate corresponding parts throughout the several views of the drawings and wherein:
Referring now to the drawings, simultaneous reference will be made to
The dearmer positioning system of the present invention includes two of the assemblies shown in
For purposes of versatility, diameter D2 may be selected to allow full ring 16 to slide within a particular caliber of gun barrel (e.g., a 105 millimeter gun barrel). In this way, two of full ring 16 may be used to clamp onto a dearmer barrel. Since lodged projectile removal often requires a gun barrel to be flooded with water, each of half rings 12 and 14 may incorporate axially-extending through holes 12C and 14C, respectively. The inclusion of holes 12C and 14C facilitates the sliding of full ring 16 down a flooded gun barrel.
Assembly 10 also includes a one-piece outer ring 30 made of a rigid plastic material having a central circular opening 32 of diameter “D3” that is sized such that full ring 16 slidingly fits in opening 32. Full ring 16 is coupled to outer ring 30 using threaded fasteners 34. In the illustrated example, two threaded fasteners 34 are threaded into/through diametrically-opposed threaded sleeves 30A that radially extend through outer ring 30. When full ring 16 is to be coupled to outer ring 30, threaded fasteners 34 extend into opening 32 to engage aligned holes 22 of full ring 16. Threaded fasteners 34 are sized such that they do not extend beyond the diametric periphery of outer ring 30 when they engage full ring 16.
The outer diameter “D4” of outer ring 30 is selected to allow outer ring 30 to slide within a particular larger caliber of gun barrel (e.g., a 155 millimeter gun barrel). Two of assembly 10 (as shown in
In the illustrated exemplary embodiment, holes 22 (in full ring 16) and threaded sleeves 30A (in outer ring 30) are each in diametric opposition (opposite) to facilitate alignment of holes 22 with sleeves 30A during the assembly process. To keep full ring 16 from pivoting about threaded fasteners 34 while also assuring alignment of threaded sleeves 30A with holes 22, full ring 16 may be indexed to outer ring 30. For example, tabs 36 may be provided along opening 32 for engagement by depressions or receptacles 16B defined in the periphery of full ring 16. More specifically, in the illustrated exemplary embodiment, tabs 36 are in diametric opposition (opposite) to one another and are each located 90° from threaded sleeves 30A. To balance any pivoting loads acting on full ring 16, each receptacle 16B is formed partially in half ring 12 and partially in half ring 14.
The advantages of the present invention are numerous. The positioning system securely and accurately positions a dearmer barrel in the central region of a gun's barrel. The system is adaptable to a variety of gun barrel calibers. The system may be expanded to even larger caliber guns by adding an additional outer ring sized to mate with such larger caliber guns.
Although the invention has been described relative to a specific embodiment thereof, there are numerous variations and modifications that will be readily apparent to those skilled in the art in light of the above teachings. It is therefore to be understood that, within the scope of the appended claims, the invention may be practiced other than as specifically described.
Finally, any numerical parameters set forth in the specification and attached claims are approximations (for example, by using the term “about”) that may vary depending upon the desired properties sought to be obtained by the present invention. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should be at least construed in light of the number of significant digits and by applying ordinary rounding.
The invention described herein was made in the performance of official duties by employees of the Department of the Navy and may be manufactured, used, licensed by or for the Government for any governmental purpose without payment of any royalties thereon.
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