Spray head assembly with integrated air cap/nozzle for a liquid spray gun

Patent metadata

Field	Value
Publication number	US-9358561-B2
Application number	US-201214234764-A
Country	US
Kind code	B2
Filing date	Jul 26, 2012
Priority date	Jul 28, 2011
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

Integrated air cap/nozzles ( 40 ), spray head assemblies ( 20 ) including the integrated air cap/nozzles ( 40 ) and liquid spray guns that include the integrated air cap/nozzles ( 40 ) are described herein. The integrated air cap/nozzles ( 40 ) provide and define both the liquid nozzle openings ( 52 ) and the center air outlets ( 54 ) for the center air of the liquid spray guns and the spray head assemblies ( 20 ). The integrated air cap/nozzles ( 40 ) can be removably attached over a liquid nozzle port ( 32 ) formed in the spray head assembly ( 20 ) and/or on the spray gun platform ( 10 ) or body using any suitable attachment mechanism.

First claim

What is claimed is:

1. An integrated air cap/nozzle for a liquid spray gun, wherein the integrated air cap/nozzle comprises:
a cap body comprising:
a nozzle body comprising a nozzle aperture, a nozzle outlet end located within the nozzle aperture, and a liquid nozzle opening located within the nozzle outlet end through which liquid exits during operation of the liquid spray gun; and
a center air outlet located in a gap defined between the nozzle aperture and the nozzle outlet end, through which center air discharges when a liquid is sprayed through the liquid nozzle opening;
wherein the liquid nozzle opening and the center air outlet are formed in a front wall of the cap body.

2. An integrated air cap/nozzle according to claim 1 , wherein the integrated air cap/nozzle is removably attached to a liquid spray gun.

3. An integrated air cap/nozzle according to claim 1 , wherein the cap body further comprises a liquid port in fluid communication with the nozzle body.

4. An integrated air cap/nozzle according to claim 1 , wherein the nozzle body is attached to the front wall of the integrated air cap/nozzle by one or more support members extending from the nozzle body to the front wall.

5. An integrated air cap/nozzle according to claim 1 , wherein the gap formed by the nozzle outlet end and the nozzle aperture comprises an annular gap.

6. An integrated air cap/nozzle according to claim 1 further comprising a barrel comprising a nozzle port, wherein the nozzle body comprises a nozzle sealing structure proximate a nozzle body inlet, wherein the nozzle sealing structure forms a liquid tight seal with the nozzle port on the barrel when the integrated air cap/nozzle is attached to the barrel.

7. An integrated air cap/nozzle according to claim 1 , wherein the nozzle body and the front wall are formed as an integral, one-piece component.

8. An integrated air cap/nozzle according to claim 1 , wherein the nozzle outlet end, the liquid nozzle opening, and the center air outlet are shaped to direct air under greater than atmospheric pressure against liquid flowing out of the liquid nozzle opening.

9. An integrated air cap/nozzle according to claim 1 further comprising a barrel, and wherein the front wall further comprises a nozzle aperture, wherein the integrated air cap/nozzle comprises two air horns, and wherein the integrated air cap/nozzle, when attached to the barrel, also defines a fan control air chamber that extends from an inlet end of a fan air barrel passage formed in the barrel to apertures located on the air horns projecting past the nozzle aperture, wherein the apertures in the air horns are located on opposite sides of an axis extending through the liquid nozzle opening such that air flowing out of the fan control air chamber through the apertures on the air horns under greater than atmospheric pressure flows against opposite sides of a stream of liquid exiting the liquid nozzle opening.

10. An integrated air cap/nozzle according to claim 1 , wherein the nozzle body comprises one or more frusto-conically shaped sections, one or more cylindrically shaped sections or a combination thereof.

11. A liquid spray gun comprising:
a nozzle port;
a removable integrated air cap/nozzle comprising a nozzle body, the integrated air cap/nozzle removably attached to the liquid spray gun, wherein the nozzle body of the integrated air cap/nozzle is positioned over the nozzle port when the integrated air cap/nozzle is attached to the liquid spray gun; and
wherein the integrated air cap/nozzle comprises a nozzle aperture, a nozzle outlet end located within the nozzle aperture, and a liquid nozzle opening located within the nozzle outlet end through which liquid exits during operation of the liquid spray gun and a center air outlet located in a gap defined between the nozzle aperture and the nozzle outlet end, through which center air discharges when a liquid is sprayed through the integrated air cap/nozzle;
wherein the liquid nozzle opening and the center air outlet are formed in the removable integrated air cap/nozzle.

12. A liquid spray gun according to claim 11 , wherein the integrated air cap/nozzle further comprises a liquid port in fluid communication with the nozzle body.

13. An integrated air cap/nozzles according to claim 1 wherein the front wall comprises at least one pair of auxiliary air apertures.

14. A liquid spray gun according to claim 11 wherein the integrated air cap/nozzle comprises at least one pair of auxiliary air apertures.

Assignees

• Johnson Erik J
• Joseph Stephen C P
• 3M Innovative Properties Co

Inventors

• Johnson Erik J
• Joseph Stephen C P

Classifications

• B05B7/063

  one fluid being sucked by the other · CPC title

• B05B7/0815 Primary

  with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter · CPC title

• B05B15/02

  Operations & Transport · mapped topic

• B05B7/066 Primary

  with an inner liquid outlet surrounded by at least one annular gas outlet · CPC title

• B05B7/2478

  Gun with a container which, in normal use, is located above the gun · CPC title