US3617000A - Spray gun for applying solid particles - Google Patents

Spray gun for applying solid particles Download PDF

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Publication number
US3617000A
US3617000A US833352A US3617000DA US3617000A US 3617000 A US3617000 A US 3617000A US 833352 A US833352 A US 833352A US 3617000D A US3617000D A US 3617000DA US 3617000 A US3617000 A US 3617000A
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US
United States
Prior art keywords
barrel
gun
flexible tube
handle
solid particles
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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.)
Expired - Lifetime
Application number
US833352A
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English (en)
Inventor
Richard O Probst
Kenneth E Pollard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ransburg Corp
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Ransburg Corp
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
Application filed by Ransburg Corp filed Critical Ransburg Corp
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Publication of US3617000A publication Critical patent/US3617000A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials

Definitions

  • Such a gun can also include an elongated insulator forming a passageway for high-voltage circuit means within the gun and curved between the grip portion of the handle and another bore in the barrel.
  • a closure means of insulating material at the front of the barrel can include a portion projecting into the barrel to provide electrical insulation for the connection between the high-voltage circuit means and an electrode mounted on the front of the spray gun.
  • the closure means can also provide a means for attaching a spray nozzle at the front of the gun.
  • One such fixed gun included a tube forming a passageway for solid particles.
  • a deflector for the solid particles was adjustably positioned forwardly of the passageway. Means to adjust the deflector extended along the passageway and rearwardly of the gun.
  • the tube forming the passageway was curved near the rear of the gun to provide a portion to which a conduit for solid particles was attached.
  • the tube was connected to a high-voltage source and was supported on a fixed holder in operation.
  • a gun of this invention includes as a passageway an elongated flexible tube from the spray nozzle at the front of the gun to the source of solid particles to be applied.
  • the spray gun includes a handle having a grip portion and a barrel.
  • the elongated flexible tube forming a passageway for solid particles is curved to angle within the grip portion of the handle and a bore in the barrel and terminates adjacent a spray nozzle at the forward end of the gun.
  • the barrel member is of nonconducting material and includes, in addition to the bore for the elongated flexible tube, another bore.
  • An elongated insulator is contained in this bore and curves within the grip portion of the device.
  • the elongated insulator forms a passageway for high voltage circuit means within the spray gun.
  • closure means is provided at the front of such an electrostatic gun having two bores.
  • the closure means includes a portion at its rear which extends into the bore of the barrel.
  • One bore in the closure means accepts the elongated flexible tube, and means is provided to attach a spray nozzle at the front of the gun on the axis of this bore.
  • the other bore is closed at its front end and accepts the elongated insulator.
  • Means to electrically connect the circuit means in the elongated insulator with an electrode at the front of the spray gun is carried within the closure means.
  • the preferred embodiment of such a gun is shown in the attached drawings.
  • FIG. I is a perspective drawing of a system for electrostatically charging and applying solid particles to articles to be coated including a spray gun embodying this invention.
  • H6. 2 is a cross-sectional view through the center of the spray gun of FIG. I.
  • FIG. 1 illustrates a method of applying such materials to an article using the apparatus of this invention.
  • thermoplastic or thermosetting powder material is to be applied to an article
  • the article in some instances is raised to a temperature above the fusion temperature of material but below the temperature at which the material is deleteriously aflected.
  • the solid particles of material upon being deposited upon the article are fused into a continuous film.
  • heating is sometimes unnecessary and the solid particles which are deposited on the article are retained on the surface of the article as a coating of discrete particles by virtue of their electrostatic charge until they can be fused.
  • Compressed air from inlet 16 passes through flow control regulator 21 (the details of which are not shown) and solenoid valve 22 (the details of which likewise are not shown). In operation a controlled flow of air passes through regulator 21 and valve 22 into a nozzle within the injection pump 20. The compressed air passing through the nozzle within pump 20 creates a reduced pressure at an opening 23 of the injection pump. Coating material particles are withdrawn from fluidized bed 19, entrained in the flow of compressed air and directed into an elongated flexible tube 24.
  • Solid particles of coating material are conveyed suspended in the compressed air through the elongated flexible tube into spray gun 14. Delivery of coating material to spray gun I4 is controlled by the operator of the spray gun by manipulation of a trigger which actuates solenoid valve 22, as will be explained. When the operator of the spray gun wishes to apply coating material particles to an article to be coated, he merely depresses the trigger of the spray gun. Coating material particles are withdrawn from source 13 in the manner described and delivered through the elongated flexible tube 24 to spray nozzle 25 on the spray gun. Actuation of the trigger also turns on a source of high voltage 26. Electric charge is conducted through a high-voltage conductor 27 into spray gun l4.
  • regulators l7 and 21 to control the flow of compressed air are not shown since such regulators are in common use and their selection can be made readily by one skilled in the art.
  • An example of such a regulator is Kendall Model 30 Air Pressure Regulator, manufactured by Fairchild- Hillor.
  • Details of the solenoid valve 22 are likewise not given.
  • An example of such a valve is Skinner Precision Industries, Inc. Solenoid Valve No. V30B2l00.
  • the structure of spray gun 14 which is the preferred embodiment of this invention, is shown in FIG. 2.
  • the spray gun 14 includes a barrel including a barrel portion 29 attached to a handle 30 including a grip portion 31 depending at an angle below the barrel to provide a spray operator with means to grip and manipulate the spray gun.
  • the barrel member 29 is constructed of nonconducting material and includes two bores 32 and 33. Bores 32 and 33 have a short length at only the rear of barrel member 29 which is largely in the form of a relatively thin-walled tube.
  • An elongated insulator 34 forms a tubular passageway for circuit means within the gun.
  • the elongated insulator 34 is within bore 33 of the barrel member 29 and is curved into the grip portion 31 of handle 30. It is formed of nonconductive material, has a sufficient wall thickness to withstand high voltages, such as 50,000 to 100,000 volts, which are applied to the gun, and provides a surface which will not act as a path for high voltage.
  • Non conductive materials suitable for this application include for example, Delrin, nylon and polyethylene.
  • the passageway for solid particles within the gun is formed by the elongated flexible tube 24.
  • the elongated flexible tube 24 defines the entire passageway for conveying solid particles suspended in compressed air between the source 13 and the spray nozzle 25 at the forward end of spray gun 14.
  • the elongated flexible tube is inserted in the grip portion 31 of handle 30 and into the bore 32 of barrel member 29.
  • the handle 30 contains means within it in the form of surfaces 37 and 38 to support the elongated flexible tube. Assembled within the spray gun, the elongated flexible tube curves between the grip portion 31 of the handle and bore 32 of the barrel.
  • the spray gun 14 at its forward end includes the closure means 39 including a compression member 40 and an elastic member 41.
  • Closure means 39 includes projecting portion 42 at its rear adapted to enter and be fastened to the forward end of barrel member 29.
  • Two bores 43 and 44 pass through the projecting portion 42 at its rear in alignment with bores 32 and 33 respectively.
  • Elongated flexible tube 24 passes within bore 43 and compression member 40 to the forwardmost portion of closure means 39.
  • Compression member 40 and closure means 39 are threadedly engaged at the forward threaded portion 43a of bore 43. As compression member 40 is threaded into closure means 39, elastic member 41 is compressed and grips elongated flexible tube 24 to fasten it within spray gun l4.
  • Elongated insulator 34 is within bore 44 of closure means 39. Bore 44 is closed at its forward end by closure means 39 which includes means 45, in the form of a small wire, electrically connecting the circuit means within said elongated insulator to a surface in recess 46 at the forward end of closure means 39.
  • the forward end of closure means 39 also includes a threaded portion 48 to provide means on the axis of bore 43 for attaching spray nozzle 25 to spray gun l4.
  • Spray nozzle 25 carries an O-ring 47 in a groove to seal the spray nozzle with compression member 40.
  • the rear surface of spray nozzle 25 carries a portion that projects into recess 46 when mounted on closure means 39.
  • the electrode 28 carried by spray nozzle 25 extends into the projecting portion of the nozzle and is electrically connected with the source of high voltage by contacting electrical connecting means 45 within the recess 46 at the front of closure means 39.
  • Spray nozzle 25 and electrode 28 are attached to the front portion of barrel 29 by a threaded nut of nonconductive material 49 which engages the threaded portion 46 of the closure means 39.
  • Elongated insulator 34 passes forwardly through bore 33 into closed bore 44 of the closure member 49.
  • semiconducting pluglike member 50 extends into the passageway of elongated insulator 34 and contacts resistor 35 thus interconnecting resistor 35 with the electrically connecting means 45 of closure means 39.
  • Portion 42 ofclosure means 39 projects rearwardly into the barrel 29 a sufficient distance so that a circuitous path is formed over the surfaces of elements 34, 39, and 29 having a sufficient distance to prevent sparking or other electrical leakage between the electrical connection at element 50 and the outside of spray gun 14.
  • Closure means 39 provides suffcient insulation thickness between pluglike member 50 and electrical connecting means 45 and its exterior surface to prevent sparking through the closure means to a grounded object approaching the front of the gun.
  • the recess 46 at the front of closure means 39 permits the formation of a circuitous path from the connection between electrode 28 and means 45 to the exterior of the spray gun 14 over the surfaces of elements 25, 39, and 48.
  • barrel member 29 of the barrel is constructed of electrically nonconductive material.
  • Materials suitable for use in the barrel member include phenolic, epoxy, nylon, Delrin, polyethylene, polypropylene and other such materials.
  • Barrel 29 may be formed by casting, injection molding, or machining of these nonconductive materials.
  • the barrel member 29 is formed of a relatively thin-walled phenolic tube having a phenolic insert 29a cemented in its rear that has been drilled to provide bores 32 and 33.
  • Closure means 39 of the barrel is likewise preferably formed of electrically nonconductive material. Materials identified as suitable for use for barrel member 29 are also suitable for use for the closure means 39.
  • the projecting portion 42 at the rear of closure means 39 is adapted to enter the barrel member 29.
  • Use of a barrel like that comprised by composite barrel member 29 and closure member 39 removes weight from the forward portion of the gun and permits it to be economically made.
  • the elongated flexible tube 24 is preferably formed of a nonconducting material such as nylon or polyethylene tubing.
  • a spray gun like that shown in FlG. 2 would use a nylon hose having an inside diameter of threeeighths inch and an outside diameter ofone-halfinch.
  • the handle 30 is preferably formed of a metallic material which can be cast such as for example aluminum or zinc.
  • the metallic handle is maintained at ground potential by a braided conductor (not shown) forming the outside part of the cable used as the high-voltage conductor 27.
  • the braided conductor portion of high-voltage conductor 27 is connected to the handle 30 and to a ground connection at the voltage supply.
  • the operator gripping portion 31 of handle 30 will, thus, be maintained at ground potential and prevented from accumulating a static charge which might form a harmful uncontrolled electric discharge.
  • the operator depresses trigger 51 mounted on handle 30.
  • a portion 52 extending into the handle actuates switch 53 contained within the handle 30.
  • Conductors from electrical switch 53 (not shown) run through the grip portion of the handle and are connected to voltage supply 26 (FIG. I) and solenoid valve 22 (FIG. 1) in such a manner as to turn on the voltage supply and to open the solenoid valve when the trigger is depressed.
  • Air flowing through injection pump thus entrains the solid particles of coating material from the fluidized bed 19 and directs it into the elongated flexible tubing 24 forming the powder material passageway within the gun.
  • the entire passageway from the injection pump to the spray nozzle has a uniform cross section and a smooth wall without any discontinuity.
  • the elongated flexible tube curves gradually between the grip portion of the handle and the barrel.
  • the coating material particles flow to the nozzle in a stable suspension.
  • no solid particles are trapped in the passageway.
  • the operator may easily clean the passageway and in changing from one material to another avoid contamination of the second material with a residue of materials used earlier.
  • the continuous passageway also prevents solid particles from contaminating the interior of the spray gun without resorting to any seal members within the spray gun.
  • the elongated flexible tubing, or the passageway for coating materials can enter a spray gun at the base of the grip portion of the handle, a position where it imposes the least possible restriction on the manipulability of the spray gun, and curve into a barrel portion of the gun. in a sense, such a structure includes a self-contained and ready supply of replacement parts.
  • the spray nozale and a compression member can be removed from the front end of the gun.
  • the elongated flexible tube which forms the passageway with its walls can be pushed or pulled forwardly through the spray gun and the portion of the tube containing the failure can be cut from the end and discarded.
  • Replacing the compression member and elastic member at the front of the barrel will fasten the elongated flexible tube to the gun and operation can be continued. This procedure can be repeated until the elongated flexible tube leading from the source of solid particles becomes too short to permit ready manipulation of the spray gun.
  • Such a spray gun can thus be readily repaired many times without the delay of obtaining spare parts.
  • An electrostatic spray gun for charging and depositing powder particles comprising,
  • a handle including a grip portion
  • a closure means including a projecting portion at the rear and adapted to enter the forward end of the barrel, and including two bores in alignment with the bores of the barrel,
  • the electrostatic spray gun of claim I wherein the barrel includes a barrel member comprised of a thin-walled tube and an insert providing the two bores.
  • An electrostatic spray gun for charging and depositing powder particles comprising,
  • a barrel member of nonconducting material including two bores
  • a closure means including a projecting portion at the rear adapted to enter the forward end of the barrel and including two bores in alignment with the bores of the barrel,
  • the electrostatic spray gun of claim 8 including a spray nozzle mounted on the compression means, attached to the closure means, and providing a seal between the compression means an the spray nozzle.
  • a gun for spraying solid particles comprising,
  • a barrel projecting from the handle and including a bore
  • an elongated flexible tube including a passageway for conveying solid particles suspended in gas passing within the handle and the bore of the barrel, the tube curving gradually in the gun,
  • the passageway of said elongated flexible tube being substantially smooth walled and having a substantially uniform cross section from a source of solid particles to the spray forming means whereby the solid particles flow to the spray forming means in a substantially stable suspension.
  • the gun of claim 10 including a cylindrical compression member around the elongated flexible tube and threadedly engaging the forward end of the barrel, and means compressed as the compression member is threadedly engaged to grip the elongated flexible tube.
  • the gun of claim 11 including a seal member between the cylindrical compression member and the spray forming means.
  • the electrostatic spray gun of claim 6 wherein the elongated flexible tube has a substantially uniform cross section from a source of solid particles to the spray nozzle whereby the solid particles flow to the nozzle is a substantially stable suspension.
  • a spray gun for spraying solid particles comprising a barrel including a bore
  • a handle including a portion depending at an angle from the barrel
  • an elongated flexible tube including a passageway for conveying solid particles suspended in a gas within the portion of the handle depending at an angle from the barrel and within the bore in the barrel, the passageway of the flexible tube curving gradually in the handle to reduce erosion of the passageway at the curve by solid particles flowing thereby and the passageway having a substantially uniform cross section from a source of solid particles to the spray nozzle whereby the solid particles flow to the nozzle in a substantially stable suspension.
  • a closure means is adjacent the forward end of the barrel and attaches the nozzle to the forward end of the barrel, the closure means engaging the elongated flexible tube to locate the tube within the forward end of the barrel.
  • the barrel includes two bores, the second of the bores including an elongated insulator for electrical circuit means, the elongated insulator includes a curved portion in the handle.
  • a spray gun for spraying solid particles comprising a barrel including a bore
  • a handle including a portion depending at an angle from the barrel
  • means including a passageway for conveying solid particles suspended in a gas within the portion of the handle depending at an angle from the barrel and within the bore in the barrel, the passageway curving gradually in the handle to reduce erosion of the passageway at the curve by solid particles flowing thereby and the passageway having a substantially uniform cross section from a source of solid particles to a spray nozzle connected to the bore whereby solid particles flow to the nozzle in a substantially stable suspension.

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  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
US833352A 1969-06-16 1969-06-16 Spray gun for applying solid particles Expired - Lifetime US3617000A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83335269A 1969-06-16 1969-06-16

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US3617000A true US3617000A (en) 1971-11-02

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US833352A Expired - Lifetime US3617000A (en) 1969-06-16 1969-06-16 Spray gun for applying solid particles

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US (1) US3617000A (enExample)
JP (1) JPS5020109B1 (enExample)
AT (1) AT307594B (enExample)
BE (1) BE751902A (enExample)
CH (1) CH510467A (enExample)
DE (1) DE2028991A1 (enExample)
FR (1) FR2051104A5 (enExample)
GB (1) GB1310284A (enExample)
NL (1) NL144841B (enExample)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2207433A5 (enExample) * 1971-11-18 1974-06-14 Ransburg Corp
US4660772A (en) * 1984-09-26 1987-04-28 A. O. Smith Corporation Electrostatic powder spray gun nozzle
US4830279A (en) * 1987-09-21 1989-05-16 Nordson Corporation Flat spray nozzle for a spray gun
EP0383030A1 (de) 1989-02-14 1990-08-22 ITW Gema AG Sprühbeschichtungsgerät zum elektrostatischen Sprühbeschichten
US5351890A (en) * 1994-01-13 1994-10-04 Graves Spray Supply, Inc. Applicator having a glitter container including a venturi pump and static reducing tinsel
US5480095A (en) * 1993-09-14 1996-01-02 Minnesota Mining And Manufacturing Company Actuator and container for dispensing fluids
WO1996011061A1 (en) * 1994-10-05 1996-04-18 Enexus Corporation Apparatus for coating substrates with inductively charged resinous powder particles
US20040123856A1 (en) * 2002-06-05 2004-07-01 Finstad Mark T. Paintball projectile drop compensator
US20050091900A1 (en) * 1999-06-14 2005-05-05 Tippmann Dennis J.Jr. Gun
US20070017498A1 (en) * 2005-06-30 2007-01-25 National Paintball Supply Barrel attachment for gas gun
US20070069064A1 (en) * 2005-05-19 2007-03-29 National Paintball Supply, Inc. Barrel attachment for a gas gun
USD561293S1 (en) 2005-11-29 2008-02-05 Kee Action Sports I Llc Barrel and barrel spin attachment for a compressed gas gun
US20080277507A1 (en) * 2007-05-09 2008-11-13 Nordson Corporation Nozzle with internal ramp
US20100175548A1 (en) * 2009-01-12 2010-07-15 Yuri Levin Method and apparatus for the reduction of muzzle jump in firearms and weapons
US20180369878A1 (en) * 2017-06-26 2018-12-27 Citic Dicastal Co., Ltd Automatic powder cleaning system for mixed-line hub bolt holes and combined powder cleaning gun

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52168206U (enExample) * 1976-06-14 1977-12-20

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3048498A (en) * 1956-03-20 1962-08-07 Ransburg Electro Coating Corp Electrostatic spray coating system
US3086711A (en) * 1959-04-27 1963-04-23 Sames Mach Electrostat Spray guns having a fixed electrostatic head
US3248606A (en) * 1961-12-08 1966-04-26 Sames Mach Electrostat Apparatus for dispersing and electrically charging substances in discrete particulate form
US3382091A (en) * 1966-01-07 1968-05-07 Ransburg Electro Coating Corp Electrostatic coating methods and apparatus for conductive coating materials

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3048498A (en) * 1956-03-20 1962-08-07 Ransburg Electro Coating Corp Electrostatic spray coating system
US3086711A (en) * 1959-04-27 1963-04-23 Sames Mach Electrostat Spray guns having a fixed electrostatic head
US3248606A (en) * 1961-12-08 1966-04-26 Sames Mach Electrostat Apparatus for dispersing and electrically charging substances in discrete particulate form
US3382091A (en) * 1966-01-07 1968-05-07 Ransburg Electro Coating Corp Electrostatic coating methods and apparatus for conductive coating materials

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2207433A5 (enExample) * 1971-11-18 1974-06-14 Ransburg Corp
US4660772A (en) * 1984-09-26 1987-04-28 A. O. Smith Corporation Electrostatic powder spray gun nozzle
US4830279A (en) * 1987-09-21 1989-05-16 Nordson Corporation Flat spray nozzle for a spray gun
EP0383030A1 (de) 1989-02-14 1990-08-22 ITW Gema AG Sprühbeschichtungsgerät zum elektrostatischen Sprühbeschichten
US5711484A (en) * 1993-09-14 1998-01-27 Minnesota Mining And Manufacturing Company Dispensing tube for directing the dispensing of fluids
US5480095A (en) * 1993-09-14 1996-01-02 Minnesota Mining And Manufacturing Company Actuator and container for dispensing fluids
US5351890A (en) * 1994-01-13 1994-10-04 Graves Spray Supply, Inc. Applicator having a glitter container including a venturi pump and static reducing tinsel
WO1996011061A1 (en) * 1994-10-05 1996-04-18 Enexus Corporation Apparatus for coating substrates with inductively charged resinous powder particles
US5518546A (en) * 1994-10-05 1996-05-21 Enexus Corporation Apparatus for coating substrates with inductively charged resinous powder particles
AU707667B2 (en) * 1994-10-05 1999-07-15 Enexus Corporation Apparatus for coating substrates with inductively charged resinous powder particles
CN1071598C (zh) * 1994-10-05 2001-09-26 E-系列公司 用感应充电的粉末颗粒涂敷基底的装置和方法
US7451756B2 (en) 1999-06-14 2008-11-18 Tippmann Sports Llc Paintball spin application method
US20050091900A1 (en) * 1999-06-14 2005-05-05 Tippmann Dennis J.Jr. Gun
US20060191524A1 (en) * 2002-06-05 2006-08-31 National Paintball Supply, Inc. Paintball projectile drop compensator
US7275531B2 (en) 2002-06-05 2007-10-02 Kee Action Sports I Llc Paintball projectile drop compensator
US7040310B2 (en) 2002-06-05 2006-05-09 National Paintball Supply, Inc. Paintball projectile drop compensator
US7699048B2 (en) 2002-06-05 2010-04-20 Kee Action Sports I Llc Paintball projectile drop compensator
US20040123856A1 (en) * 2002-06-05 2004-07-01 Finstad Mark T. Paintball projectile drop compensator
US20090095274A1 (en) * 2002-06-05 2009-04-16 Kee Action Sports I Llc Paintball projectile drop compensator
US20070069064A1 (en) * 2005-05-19 2007-03-29 National Paintball Supply, Inc. Barrel attachment for a gas gun
US7603998B2 (en) 2005-06-30 2009-10-20 Kee Action Sports I Llc Barrel attachment for gas gun
US20070017498A1 (en) * 2005-06-30 2007-01-25 National Paintball Supply Barrel attachment for gas gun
USD561293S1 (en) 2005-11-29 2008-02-05 Kee Action Sports I Llc Barrel and barrel spin attachment for a compressed gas gun
US20080277507A1 (en) * 2007-05-09 2008-11-13 Nordson Corporation Nozzle with internal ramp
US8123147B2 (en) * 2007-05-09 2012-02-28 Nordson Corporation Powder coating system and components
US8353469B2 (en) 2007-05-09 2013-01-15 Nordson Corporation Spray gun and coating system with filter in spray gun nozzle
US20100175548A1 (en) * 2009-01-12 2010-07-15 Yuri Levin Method and apparatus for the reduction of muzzle jump in firearms and weapons
US7937869B2 (en) * 2009-01-12 2011-05-10 Levin Yuri S Reduction of muzzle jump in firearms
US20180369878A1 (en) * 2017-06-26 2018-12-27 Citic Dicastal Co., Ltd Automatic powder cleaning system for mixed-line hub bolt holes and combined powder cleaning gun
US10639681B2 (en) * 2017-06-26 2020-05-05 Citic Dicastal Co., Ltd. Automatic powder cleaning system for mixed-line hub bolt holes and combined powder cleaning gun

Also Published As

Publication number Publication date
FR2051104A5 (enExample) 1971-04-02
AT307594B (de) 1973-05-25
CH510467A (de) 1971-07-31
DE2028991A1 (de) 1970-12-23
GB1310284A (en) 1973-03-14
NL7008795A (enExample) 1970-12-18
BE751902A (fr) 1970-11-16
JPS5020109B1 (enExample) 1975-07-11
NL144841B (nl) 1975-02-17

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