Power Spray-Coating Gun and Gun Housing for This

• US 20080191067A1
• Filed: 04/17/2006
• Published: 08/14/2008
• Est. Priority Date: 04/18/2005
• Status: Active Grant

• Current Assignee: Gema Switzerland GmbH (Graco Incorporated)
• Original Assignee: ITW Gema GmbH (Illinois Tool Works Inc.)
• Inventors: Mauchle, Felix, Sanwald, Marco, Michael, Hanspeter
• Granted Patent: US 7,617,998 B2
• Time in Patent Office: Days
• US Class Current: 239/690
• CPC Class Codes: B05B 15/62 Arrangements for supporting spraying apparatus, e.g. suction cups
• CPC Class Codes: B05B 5/032 for spraying particulate materials
• CPC Class Codes: B05B 5/0531 Power generators

Abstract

A powder spraycoating gun and its gun housing. The spraygun housing is a plastic, integral body constituting a stock fitted with a powder discharge tube and a grip fitted with a powder intake tube.

Claims

1. A plastic gun housing for a powder spraycoating gun, characterized in that it is an integral, plastic structure constituting at least the following components:

a stock;

a grip running downward from the stock;

where the stock constitutes a powder discharge tube running straight in the longitudinal stock direction and guiding the powder;

where the grip constitutes a powder intake tube running straight in the grip'"'"'s longitudinal direction and serving to guide the powder;

where the axial center lines of the two powder tubes are configured in a common plane, wherein they intersect; and

where the mutually adjacent ends of the tube ducts of one of the power tubes guiding the coating powder are connected to each other directly or through a connecting element.

2. Spraygun housing as claimed in claim 1, characterized in that the mutually adjacent ends of the tube ducts are connected to each other by an electrically insulating angled tube stub which, by means of injection molding or mold casting, is enclosed by the plastic of the integral structure;

in that the angled tube stub comprises a tube discharge leg axially entering the powder discharge tube of the stock, said leg being substantially shorter than the powder-guiding segment of the powder discharge tube adjoining it; and

in that the angled tube stub comprises a tube intake leg axially entering the powder intake tube of the grip.

3. Spraygun housing as claimed in claim 2, characterized in that the tube intake leg of the angled tube stub entering the powder intake tube of the grip is substantially shorter than the powder-guiding segment of the powder intake tube adjoining it.

4. Spraygun housing as claimed in claim 2, characterized in that a lower, rear housing chamber is subtended in the gun housing and runs rearward from the angled tube stub and issues freely at the rear housing end.

5. Spraygun housing as claimed in claim 4, characterized in that the angled tube stub comprises at its rear side away from the tube discharge leg a rear side zone which is situated in free manner in the lower, rear housing chamber without being enclosed by injected gun housing plastic.

6. Spraygun housing as claimed in claim 4, characterized in that all external surfaces of the angled tube stub are enclosed by injected gun housing plastic.

7. Spraygun housing as claimed in claim 4, characterized in that a connecting aperture is configured in a lower wall of the lower, rear housing chamber for the purpose of passing at least one electrical line.

8. Spraygun housing as claimed in claim 2, characterized in that the angled tube stub is made of a material more abrasion resistant than the plastic of the gun housing and in that it counteracts coating powder deposits.

9. Spraygun housing as claimed in claim 1, characterized in that, starting from the stock, the grip extends at least 4 cm downward.

10. Spraygun as claimed in claim 1, characterized in that it constitutes an upper housing chamber extending from the rear housing end to the front housing end and being open at the rear housing end to allow inserting a high voltage generator.

11. Spraygun housing as claimed in claim 1, characterized in that it constitutes at least one compressed air duct which comprises a segment extending through the stock parallel to the tube duct of the powder discharge tube as far as the front housing end.

12. Spraygun housing as claimed in claim 1, characterized in that the compressed air duct comprises a segment also extending through the grip parallel to the tube duct of the powder intake tube.

13. Powder spraycoating gun characterized by at least one gun housing defined in claim 1.

14. Powder spraycoating gun as claimed in claim 13, characterized in that the rear housing end constitutes at least one housing chamber which is open to the rear and is closed by a closing body that closes this minimum of one housing chamber at the rear end and that is inserted into the rear housing end, that is sealed off radially relative to the inner housing walls and is detachably affixed to the gun housing.

15. Powder spraycoating gun as claimed in claim 13, characterized in that an electrically insulating spacer is inserted at the front housing end into the front housing end of the gun housing, said spacer being fitted with a central connecting duct axially adjoining the end of the powder discharge duct and with an upper connecting duct axially adjoining the upper housing chamber of claim 8;

where the front end of the upper connecting duct is sealed by an electric terminal which, within the upper connecting duct, can be contacted by a high voltage terminal of the high voltage generator and which, on its front side situated in front and outside the upper connecting duct can be contacted by a further electrical terminal that is connected to at least one electric high voltage electrode fitted on a spray unit spraying coating powder, said spray unit in turn being affixed to the front end of the gun housing, said spacer being situated between the gun housing and the spray unit.

16. Powder spraycoating gun as claimed in claim 15, characterized in that the spacer is ultrasonically welded to the gun housing.

17. Powder spraycoating gun as claimed in claim 16, characterized in that the spacer is ultrasonically welded to the powder discharge tube of the gun housing.