EP2300771A1 - Apparatus and method for cleaning gun barrels - Google Patents
Apparatus and method for cleaning gun barrelsInfo
- Publication number
- EP2300771A1 EP2300771A1 EP08789980A EP08789980A EP2300771A1 EP 2300771 A1 EP2300771 A1 EP 2300771A1 EP 08789980 A EP08789980 A EP 08789980A EP 08789980 A EP08789980 A EP 08789980A EP 2300771 A1 EP2300771 A1 EP 2300771A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- barrel
- support rod
- fluid
- cleaning
- gun
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A29/00—Cleaning or lubricating arrangements
Definitions
- the present invention relates to the military field and, in particular, it relates to an apparatus for cleaning a gun barrel, in particular for large calibre and large size not easily portable weapons such as cannons, howitzers, mortars, etc.. Furthermore, the invention relates to a method for cleaning gun barrels carried out with this apparatus. Description of the technical problem
- the operators that use large weapons such as cannons, howitzers, mortars, rifles etc. during a launch campaign, contact the dust of the burnt propelling charges, containing among others, mercury fulminate, potassium chlorate, antimony sulphide, lead with presence of antimony 2,5%-3%, residues of brass, steel plated with tomback (90% copper and 10% zinc, phosphorus, dust of nitrocellulose and nitro-glycerine) .
- the gun barrels are periodically subject to cleaning.
- the method commonly used for cleaning the guns comprises, in the parts subject to explosion of the propelling charge, the use of solvents derived from hydrocarbons .
- solvents derived from hydrocarbons has many drawbacks .
- the above described solvents are not suitable for a perfect cleaning of the gun barrels, since to an effective removal of the carbon residues of the propelling charge an effective removal does not correspond of the metal residues present in them.
- residues of copper, brass, lead, steel plated to the tomback can be removed exclusively through a mechanical action, by means of swabs, brushes, or other metal tools.
- Such methods produce many small abrasions in the barrels that cause early wear of the weapons .
- the hydrocarbon-based solvents are classified as dangerous substances, called toxic-noxious substances, and are then subject to strict regulations concerning their use, transport and storage.
- the regulations for their use require protecting masks or rebreathers for uses in a long period.
- a further drawback deriving from the use of hydrocarbon-based solvents for cleaning gun barrels is their disposal after use that is expensive and difficult especially in a use during distant military exercises.
- systems exist that provide the immersion of the weapons to clean in a basin containing water that is subject to action of ultrasonic pulses for removing the stuck residues of the propelling charges.
- basins does not allow a precise action on the inner surfaces the weapons, such as the barrel where projectiles are housed.
- an apparatus for cleaning a gun barrel such as of cannons, howitzers, mortars, rifles, said barrel having an inner chamber, said apparatus comprising:
- a support rod for at least one transmitter of ultrasonic pulses operatively connected to the generator of ultrasonic waves by a connection cable, said support rod being arranged, in use, in the gun barrel with a measured amount of a cleaning fluid, said ultrasonic waves being such that cavitation conditions are established in said fluid to remove impurities, in particular residues of propelling charge, from the inner surface of the barrel; whose main feature is that said fluid comprises at least one surfactant.
- the surfactant is an anionic surfactant.
- the anionic surfactant comprises saturated and unsaturated fatty acids with a chain length from 12 to 18 carbon atoms, where the carboxylic function is salified with one cation selected from the group comprised of sodium (Na) , potassium (K) , Magnesium (Mg) , lead (Pb), aluminium (Al), salt ammonic, etc.
- the anionic surfactant can be selected from the group comprised of:
- alkaline soaps in particular potassium stearate and palmitate
- metal soaps in particular lead (Pb) and calcium (Ca) soaps
- - amine soaps in particular comprising amino methyl- propanediol (AMP) ;
- - sulphates and sulfonic esters for example the sodium- lauryl sulphate, or sodium-dodecyl sulphate
- - sulfonates in particular alkan or alkyl-aryl sulfonates .
- the above described fluid comprises water and the anionic surfactant mixed in a determined ratio.
- a reservoir for the water and a reservoir for the surfactant can be provided connected to a duct for feeding the fluid into the gun barrel .
- a mixer can be provided adapted to mix in determined ratio the water and the surfactant.
- a mixer can be used having a means for adjusting the water/surfactant ratio.
- the above described fluid comprises also a measured amount of an antifreeze substance, such as ethylene glycol .
- the transmitter of ultrasonic pulses can comprise at least one piezoelectric transducer, said piezoelectric transducer transforming the electric pulses of a generator into mechanical energy comprising a plane elastic wave.
- the transmitter of ultrasonic pulses may be of magnetostrictive type, i.e. based on a magnetostrictive material, which is subject to expansion and contraction when immersed within an alternative magnetic field.
- the support rod has at least one housing within which the, or each, transmitter of ultrasonic pulses is housed.
- the support rod has an aperture with respect in which the or each transmitter is arranged.
- the support rod is associated with a plurality of transmitters of ultrasonic waves connected in series .
- the support rod can comprise guiding means suitable to assist the introduction/extraction of the support rod towards/away from said barrel .
- the guiding means can comprise a ring spacer fixed to the outer surface of the support rod.
- each, spacing element is provided anchorable in a releasable way to the outer surface of the support rod. This way, in turn, it is possible to select a specific ring spacer among those available, in particular having a size corresponding to the barrel .
- the guiding means can comprise a handling rod adapted to engage with the support rod to assist its correct location in the gun barrel.
- the handling rod can be engaged with the support rod by means of respective connection flanges. More in detail, a flange at one end of the support rod and a flange at one end of the handling rod are provided. Alternatively, the handling rod and the support rod can be engaged telescopically by means of respective screw threaded ends .
- the handling rod is made of a plurality of segments that are connected in series up to reaching a determined length.
- a head segment, or a tail segment, of the series of segments is connected by the connection flange to the support rod.
- the handling rod may have tubular shape and a longitudinal aperture in which the connection cable can be housed.
- the apparatus can, furthermore, comprise feeding means for feeding the fluid in the barrel, said feeding means comprising: - a duct, in particular a flexible duct, which in use is arranged in hydraulic connection with the barrel,
- a pump that in use is arranged in hydraulic connection with the barrel by said duct;
- the pump can be used both for taking the fluid from the reservoir and feeding it in the barrel for cleaning it from the residues in it present, and also for removing the polluted fluid from the barrel once ended the cleaning operation.
- at least one filter is provided through which the polluted liquid passes when discharging the barrel .
- the generator of ultrasonic pulses the support rod, the storage reservoir and the filter are mounted on a carriage to allow an easy transport to the area of operation.
- inspection means can be provided for inspection of the barrel and testing the efficiency of the cleaning process.
- the inspection means are housed in fluid-tight housing.
- the inspection means comprises:
- the videocamera has a macro objective.
- the inspection means provide a connection flange engageable with the flange of said support rod, or- of said handling rod.
- the inspection means comprises ultrasonic vibrations damping means adapted to reduce the interferences of the ultrasonic waves.
- the ultrasonic vibrations damping means comprises a damping substance, for example a gel, in which the inspection means are dipped before being housed in the fluid-tght housing.
- a sealing element in use blocks hermetically the muzzle of the barrel, said sealing element having an aperture defined by resilient walls adapted to tightly adhere to the outer surface of said rod.
- locking means are provided adapted to keep the sealing element in a determined position.
- lock means comprises:
- the push element can, for example, provide an elongated element having a first end connected to said locking element and a second free end of slide with respect to said locking element for contacting a contrast surface integral to said gun and external to said barrel . This way, the push element prevents from a movement of the locking element- away from a correct sealing position.
- a method for cleaning a gun barrel such as of cannons, mortars, machine-guns, handguns, rifles, said barrel having an inner chamber, provides the following steps:
- a support rod equipped with at least one transmitter of ultrasonic pulses in the barrel, said support rod being connected to a generator of ultrasonic pulses;
- the end of the gun barrel that is closed hermetically is the rear end, or breech, whereas the fluid and the support rod are put in the barrel through the front end, or muzzle.
- the gun barrel Before feeding the above described amount of fluid the gun barrel can be turned to a position of zero elevation, i.e. substantially parallel to the ground .
- a feeding step through a feeding duct is provided for feeding the fluid into the barrel, for example of flexible type, in hydraulic connection with said chamber and engaging with opposite to said hermetically closed end.
- the lock means of the muzzle has a discharge valve. This way, after cleaning the gun barrel the fluid containing the residues of the propelling charge is expelled through the discharge valve. This allows collecting the fluid polluted by the residues of the propelling charge in a reservoir to avoid polluting the environment and contacting the operators who are cleaning the weapon.
- a step can be provided of drying the barrel, for example by hand, or using a compressor, a hot air dryer, etc.
- FIG. 1 shows a perspective view of an apparatus, according to the invention, for cleaning a gun barrel, such as of cannons, mortars, machine-guns, handguns, rifles;
- FIG. 2 shows a cross sectional view of a barrel of a generic gun for which it is possible to use the method, according to the invention, for cleaning a gun barrel, such as of cannons, mortars, machine- guns, handguns, rifles;
- FIG. 3 shows diagrammatically in an exploded view an elevational side view of the apparatus of Fig. 1 and the gun barrel of Fig. 2;
- - Fig. 4 shows a partially cross sectional elevational side view of a possible structure of a flexible auxiliary duct provided in the apparatus of Fig. 1;
- - Fig. 5 shows a partially cross sectional elevational side view of the apparatus of Fig. 1 in operative conditions;
- FIG. 1 - Figs. from 6A to 6C show diagrammatically the succession of steps during the phenomenon of cavitation in the cleaning fluid, which allows to clean the gun barrel using the apparatus of Fig. 1 ;
- FIG. 7 shows in detail a cross sectional portion of a barrel used in the method, according to the invention, showing diagrammatically the cleaning action the bubbles, formed by the phenomenon of cavitation, on the inner walls of the chamber of the barrel ;
- FIG. 8 shows diagrammatically the step for discharging the fluid containing the impurities removed from the inner surface at the end of treating the gun barrel with the apparatus of Fig. 1;
- FIG. 9A and 9B show diagrammatically a partially cross sectioned elevational side view of two possible exemplary embodiments of a handling rod of the invention for handling the support rod, according to the invention
- FIG. 10 and 11 show diagrammatically a perspective partial cross sectional views of the apparatus for highlighting a possible exemplary embodiment of a sealing element of the gun barrel of the invention
- FIG. 12 shows a cross sectional view of the muzzle of a barrel of an gun to which an exemplary embodiment is applied of the apparatus, according to the invention, for highlighting some technical aspects;
- FIG. 13 and 14 show diagrammatically an elevational side view and a perspective view of an apparatus for cleaning gun barrels, respectively in operative conditions and in rest conditions. - ii -
- an apparatus 1 for cleaning a gun barrel 10, such as cannons, mortars, machine-guns, handguns, rifles, etc. comprises a generator of ultrasonic pulses 40 operatively connected by a connection cable 45 to at least one transmitter 5 constrained to a support rod 4.
- the transmitters of ultrasonic waves are indicated as 6, 5a-
- support rod 4 is put into the chamber 13 of barrel 10 with a measured amount of a cleaning fluid 20.
- a cleaning fluid 20 comprises at least one surfactant, in particular an anionic surfactant, mixed with water in a determined ratio.
- support rod 4 into chamber 13 can be assisted by the presence of a guide ring 6. It can be constrained in a removable way to the outer surface of the support rod 4 , in order to use in turn guide ring 6 of a size corresponding to chamber 13 of barrel 10.
- a handling rod 21 can be provided that engages with it at respective ends 4' and 21' .
- the use of handling rod 21 is particularly advantageous in case of a gun having a long barrel, such as a cannon/howitzer FH70.
- the end 21' of the handling rod 21 can be, for example engaged at the end 4 ' of support rod 4 by means of respective connection flange 22 and 25 steadily fixed with respect to each other by means of bolts 23.
- the handling rod 21 can be made of a plurality of segments, for example three segments 2Ia-2Ic, which are connected in series for example by means of respective screw threaded ends, up to reaching a determined length. _
- the first segment 21a of the series is connected by flange 22 to support rod 4, whereas the last segment 21c has a handgrip for assisting a grip by an operator 150.
- the handling rod 21 is of tubular shape, in particular it has a longitudinal aperture 26 in which the connection cable can be housed 45.
- the muzzle 11 of barrel 10 can be closed by means of a sealing element, or plug, 60 having at least one portion of compliant material, resilient-ly equipped with an opening 61 defined by walls 62 movable towards/away from each other resiliently. Therefore, when handling rod 21 is operated for actuating support rod 4, walls 62 of opening 60 tightly adhere to the outer surface of support rod 4 same, thus avoiding leakage of the cleaning fluid from barrel 10.
- lock means can be provided adapted to keep sealing element 60 in a correct position.
- the lock means can comprise a locking element, for example a disc 71, which in use is next to sealing element 60, and a push element for pushing with a suitable force locking element 71 against sealing element 60, for avoiding a movement of the latter away from a correct sealing position in operative conditions.
- a locking element for example a disc 71, which in use is next to sealing element 60
- a push element for pushing with a suitable force locking element 71 against sealing element 60, for avoiding a movement of the latter away from a correct sealing position in operative conditions.
- the push element can, for example, provide an elongated element 75 having a first end 75a connected to locking element 71, and a second end 75b free of sliding with respect to locking element 71, for example by means of a telescopic coupling, for contacting a contrast surface 72 integral to gun 10 and external to the barrel.
- Locking element 71 and the plug 60 have in this case respective apertures 77 and 61, through which support rod 4 is put in/extracted from barrel 10. Furthermore, a discharge duct 76a and a feeding duct 76b of the fluid towards/away from barrel 10 can be provided, arranged at respective apertures made in sealing element 60 and in locking element 71.
- the feeding the cleaning fluid 20 in barrel 10 is carried out preferably through the gun front end 11, or muzzle, after hermetically closing the rear end 12, or breech, made by a cover 16 formed by a special disc of rubber material that is introduced in the cap is normally associated to the gun.
- cover 16 can be pivotally connected to barrel 10 by a hinge 17.
- fluid 20 can be advantageously fed into barrel 10 using a duct, for example a flexible duct, constrained to the muzzle 11 of the gun barrel 10. More in detail, the fluid 20 is fed into barrel 10 up to a determined head H within duct 30, when the latter is arranged orthogonal to barrel 10.
- a duct for example a flexible duct
- the cleaning fluid can be fed into gun barrel 10 by a pump 250 in hydraulic connection with a storage reservoir 260 and with the inside of barrel 10 by a flexible duct 80.
- Pump 250 can be used both for taking the fluid from the reservoir 260, feeding it into barrel 10, for cleaning it from the pollutants in it present, and for removing the polluted fluid from barrel 10 once ended the cleaning operation.
- two different pumps can be provided, one for feeding and one for discharging the fluid.
- the apparatus can provide furthermore a filter 255 through which the polluted liquid passes, when discharging barrel 10 for separating the pollutants, which are stored in sealed containers, from the cleaning fluid containing the water and the surfactant that can be therefore reused.
- Reservoir 260, pump 250, filter 255 and the generator of ultrasonic waves in addition to transducers support 4 can be arranged on a carriage 300 to provide a device for cleaning a gun barrel 10 easily portable in an area of operation.
- the generator 40 is turned on, causing the transmission of ultrasonic waves to the mass of fluid 20 by transmitters 5a-5f.
- transmitters 5a-5f These can be piezoelectric microtransducers, or magnetostrictive microtransducers, or a combination thereof.
- the ultrasonic waves comprise compression and depression waves of that following one another at a high speed giving rise to a so-called "cavitation" phenomenon. More in detail, during the first phase of cavitation, called acoustic depression, in the fluid 20 there is the production of microscopic gas bubbles 50, or gaseous cavities, from which the name of the phenomenon comes .
- the small gas bubbles 50 starting from a starting size 50a grow reaching a final size 5Od, running through intermediate size 50b-50c.
- the high pressure P applied on each small bubble 5Od compresses the same deforming it and increasing the temperature of the gas in it contained. This causes collapse of the small bubble 5Oe, which deforms and implodes releasing a certain energy E (Fig. 6C) .
- the energy produced by the implosion of small gas bubbles 50 hits the inner surface 14 of barrel 10 interacting with it both physically, with a "brushing" action, and chemically with washing effect owing to the presence of the surfactant in the fluid 20 (Fig. 7) .
- the cleaning fluid 20 in addition to the water and to the surfactant can also have a measured amount of an antifreeze substance, for example ethylene glycol.
- an antifreeze substance for example ethylene glycol.
- the fluid 20' containing the impurities 55 removed from the inner surface of the chamber 13 is expelled through a discharge valve 35 and collected in a storage reservoir 60. This way, it is possible to avoid polluting the environment, and to prevent fluid 20', which contains the residues of the propelling charge, from contacting the operators who are cleaning barrel 10.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IT2008/000388 WO2009150674A1 (en) | 2008-06-11 | 2008-06-11 | Apparatus and method for cleaning gun barrels |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2300771A1 true EP2300771A1 (en) | 2011-03-30 |
EP2300771B1 EP2300771B1 (en) | 2012-05-02 |
Family
ID=40467345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08789980A Active EP2300771B1 (en) | 2008-06-11 | 2008-06-11 | Apparatus and method for cleaning gun barrels |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2300771B1 (en) |
AT (1) | ATE556292T1 (en) |
WO (1) | WO2009150674A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012215930A1 (en) * | 2012-09-07 | 2014-03-13 | Rheinmetall Air Defence Ag | Apparatus and method for cleaning and / or preserving weapon casings and weapon parts |
WO2020039326A1 (en) * | 2018-08-22 | 2020-02-27 | Kashyap Gautam | An ultrasonic device for cleaning firearms barrels and method thereof |
US11391535B2 (en) | 2019-08-26 | 2022-07-19 | Paul N. Begins | Firearm barrel cleaning system |
US11781828B1 (en) * | 2022-08-19 | 2023-10-10 | Impeccabarrel LLC | Firearm maintenance system |
DE102022124620B3 (en) | 2022-09-26 | 2023-09-14 | Carl Walther Gesellschaft mit beschränkter Haftung | Silencer device with insertable drying body |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5202523A (en) * | 1991-07-29 | 1993-04-13 | Grossman Dennis L | Firearm cleaning system |
DE20000483U1 (en) * | 1999-07-08 | 2000-06-29 | Boedrich Hans Joachim | Device for cleaning paint spray guns |
ITPD20030062A1 (en) * | 2003-03-25 | 2004-09-26 | O M P Di Rodighiero Srl | MACHINERY FOR CLEANING FIREARMS AND COMPONENTS |
US7594463B2 (en) * | 2005-08-19 | 2009-09-29 | Stanley Skinner | Evaporative barrel cooler |
-
2008
- 2008-06-11 AT AT08789980T patent/ATE556292T1/en active
- 2008-06-11 EP EP08789980A patent/EP2300771B1/en active Active
- 2008-06-11 WO PCT/IT2008/000388 patent/WO2009150674A1/en active Application Filing
Non-Patent Citations (1)
Title |
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See references of WO2009150674A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009150674A1 (en) | 2009-12-17 |
ATE556292T1 (en) | 2012-05-15 |
EP2300771B1 (en) | 2012-05-02 |
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