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

• the invention relates to a spray gun for spray coating objects according to the preamble of claim 1.
• the invention particularly relates to a spray gun for spray coating objects with powdered coating material.
• the invention is not limited to this, but can also be used for spray guns for spray coating objects with liquid coating material.
• Objects with coating powder is from EP - A 0 383
• the gun body consists of a barrel and a separate handle that can be attached to it.
• angled powder tube is first inserted into the handle and then inserted into the barrel from behind, the handle being connected to the barrel.
• the powder tube may consist of one piece or of two pieces of tube attached to one another at their crossing point, which are connected to one another before they are inserted into the handle and the barrel.
• a chamber for receiving a high-voltage generator is formed above the powder channel, which extends over the area of the handle.
• At least one high-voltage electrode is connected to the high-voltage generator and is arranged at the downstream end of the barrel for the electrostatic charging of the coating powder.
• Powder spray guns produce fine powder dust, which undesirably penetrates into the gun or escapes from the gun at interfaces that are airtight in themselves.
• spray guns for liquid coating material there is a risk that atomized liquid particles at the interfaces of the Store the spray gun.
• Both with powder spray guns and with liquid spray guns there is a risk that high-voltage creepage distances between high-voltage parts for electrostatic charging of the coating material and gun parts to be electrically insulated arise at interfaces between the gun parts.
• the aim of the invention is to achieve the object of designing the spray gun in such a way that no leakage problems arise.
• the spray gun should be structurally simple and inexpensive and should not require any maintenance work.
• Fig. 1 shows schematically a longitudinal section through a
• Fig. 2 is an enlarged view of the lower end of the handle of Fig. 1 with lines connected to it.
• the spray gun shown in FIGS. 1 and 2 for spray-coating objects with coating powder contains a one-piece housing body 6, preferably made of plastic, which forms a barrel 2 and a handle 4, at least their basic shapes.
• a channel 8 is formed which runs from front to back, into which a line piece 10 is inserted from the back to the front and extends forwards to an atomizer device 12.
• a handle line piece 16 is inserted airtight from bottom to top, which is inserted from bottom to top in a handle channel 18, which in the Handle-forming part of the one-piece body 6 is formed in the longitudinal direction of the handle.
• the two line pieces 10 and 16 can be flexible hoses, but are preferably rigid pipes made of plastic.
• the barrel channel 8 and the handle channel 18 are each formed in a straight line and intersecting in the one-piece body 6. Each channel 8 and 18 holds its pipe section 10 or 16 radially, but not axially.
• the barrel line piece 10 must first be inserted into the run channel 8 before the handle line piece 16 can be inserted into the handle channel 18.
• the handle Line piece 16 is held by its handle channel 18 in the radial position and in turn holds the barrel line piece 10 in the axial position without the need for additional fasteners.
• the handle line piece 16 can be pulled down and the barrel line piece 10 can be pulled out of the one-piece body 6 to the rear and can be replaced if necessary.
• a chamber 20 is formed above the barrel channel 8, which extends beyond the position of the handle 4 and is open to the rear of the pistol, but closable, for receiving a high-voltage generator 22, which is connected via an electrical line 24, an electrical contact device 26 and an electrode holder 28 of the atomizing device 12 is electrically connected to one (or more) high-voltage electrode 30, which is used in a known manner for electrostatically charging the coating material.
• the electrode 30 protrudes from a compressed air channel 32, which extends through the electrode holder to an annular channel 34, to which compressed air can be supplied from a compressed air hose 38 via a compressed air channel 36.
• the compressed air serves to keep the high-voltage electrode 30 clean of coating material and to transfer electrical charges from the high-voltage electrode 30 into the coating material.
• the compressed air channel 36 is formed in the one-piece body 6 and has a channel section 40, which extends parallel to the barrel channel 8 through the barrel 2, and one which extends parallel to the handle channel 18 through the handle 4 extending channel section 42.
• the electrode holder 28 has a tube piece 44 which extends from the front to the rear into the running channel 8 of the barrel 2 and is closely adjacent to the front end of the barrel line piece 10.
• the pipe section 44 has a radial web 46, from which a pipe section 48 which is substantially thinner in diameter and from which the high-voltage electrode 30 protrudes forwardly, projects forwardly until just before a slot nozzle 50.
• the electrical contact device 26 is arranged radially outside the pipe section 44 with an axial distance of more than 1.0 cm from the rear pipe section end on the rear side of a radial projection 49 of this pipe section 44.
• a third channel 52 is formed in the handle 4 parallel to the handle channel 18 for receiving electrical connection elements 54 for connecting an electrical low-voltage cable 56, which is connected to the electrical connection elements 54 through a handle opening of this third channel 52 formed at the lower end of the handle.
• the electrical connection elements 54 are electrically connected to the low-voltage side, for example a transformer 58, of the high-voltage generator 22 and also include a switch, not shown, which can be actuated by a trigger 60 to switch the supply of the coating material on and off.
• a coating material supply hose 60 is detachably connected to the handle line piece 16 by a quick-release connection construction, preferably a plug connection.
• a connecting piece 62 which connects the hose 60 to the handle line piece 16, has a radial extent into which the fingers 64 of a rotatable locking bracket 66 can be pivoted into or out of engagement about one of the handle line pieces in order to secure the position axially 16 parallel axis of rotation 68.
• the axis of rotation 68 is formed by a connecting part of the low-voltage cable 56, on which a ring part 70 of the locking bracket 66 is attached.
• the locking bracket 66 can have a handle part, not shown, for pivoting this locking bracket 66.
• connection socket 71 which is connected (glued or welded) to the handle line piece 16 in a rotationally fixed manner and is screwed into an internal thread of a cap 74 with an external thread 72.
• the cap 74 is arranged on the underside of the handle 4, extends up to the trigger 60 on the front of the handle, and is attached to the one-piece body 6.
• the low-voltage cable 56 is detachably fastened to the handle cap 74 in a known manner by means of a bayonet lock 76.
• the chambers formed in the barrel 2 of the one-piece body 6 are open to the rear and through one on the Piston rear side arranged second cap 78 closable.
• the barrel line piece 10 has a rod 80 which is integral with it and projects rearward from the transition point to the handle line piece 16 through the second cap 78 and a seal plate 82 which is also integral with it on the outside of the second cap 78.
• the seal plate 82 forms together with a seal 84 an airtight seal of the chambers of the barrel 2 on the back of the gun.
• a through opening 86 is formed, the diameter of which is so large that the barrel line piece 10 with the rod 80 can be pulled out of the barrel 2 to the rear, for example for cleaning or replacement, however, this is only possible if the handle line piece 16 was previously pulled down out of the barrel line piece 10.
• the handle line piece 16 is interchangeable.
• a hook 88 may be attached to the one-piece body 6 or formed together with it from a one-piece part.

Landscapes

• Nozzles (AREA)
• Electrostatic Spraying Apparatus (AREA)
• Coating By Spraying Or Casting (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7878452

Family Applications (1)

Country Status (8)

Families Citing this family (22)

Family Cites Families (10)

• 1998
  • 1998-08-22 DE DE19838280A patent/DE19838280A1/de not_active Withdrawn
• 1999
  • 1999-06-09 DE DE59914267T patent/DE59914267D1/de not_active Expired - Lifetime
  • 1999-06-09 EP EP99927928A patent/EP1104333B1/fr not_active Expired - Lifetime
  • 1999-06-09 AT AT99927928T patent/ATE357292T1/de not_active IP Right Cessation
  • 1999-06-09 US US09/763,314 patent/US6622948B1/en not_active Expired - Lifetime
  • 1999-06-09 WO PCT/EP1999/003970 patent/WO2000010724A1/fr not_active Ceased
  • 1999-06-09 CA CA002343753A patent/CA2343753C/fr not_active Expired - Fee Related
  • 1999-06-09 JP JP2000566032A patent/JP3889223B2/ja not_active Expired - Fee Related
  • 1999-06-09 ES ES99927928T patent/ES2284257T3/es not_active Expired - Lifetime

Non-Patent Citations (1)

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