Reversible airless spray tips are well known and have long been popular. Air-assisted airless spray guns have also been popular but have generally not included the ability to reverse the tip for cleaning clue to the difficulty in routing the required air passages to the front of the tip.
The device of the instant invention utilizes a standard reversible tip such as Graco's FFT210. The air cap is provided with four air passages which aim radially inwardly and in the preferred embodiment are located 45° from the centerline of the housing. The passages have a 12° angle from being perpendicular to the longitudinal axis of the assembly. The four jets provided by these passages are guided by four channels in the surface of the housing (also having the 12° ramp angle) so as to guide the air flow to the center of the oval orifice in the carbide.
Two pairs of opposing air jets are also provided in the air cap directed perpendicularly to the fan of paint or other atomized material and these jets are angled at about 20.5° relative to the plane that is perpendicular to the longitudinal axis of the assembly. Each pair is directed at one another and is spaced laterally from the longitudinal axis to help in removing tails from the pattern.
These and other objects and advantages of the invention will appear more fully from the following description made in conjunction with the accompanying drawings wherein like reference characters refer to the same or similar parts throughout the several views.
The air-assisted airless spray tip assembly is generally designated 10 in
The second set of jets 22 are directed perpendicularly to the fan 26 and spaced laterally from the longitudinal axis 24. Jets 24 are angled at about 20.5° from the plane that is perpendicular to the longitudinal axis 24 of assembly 10.
Ramp jets 20 are located so as to direct the air flow along channel ramps 28 located on the front of housing 30 which also bear an angle of about 12° relative to a plane that is perpendicular to the longitudinal axis 24 of assembly 10 so as to guide the flow to the center of the oval or cat-eye shaped orifice 14a.
An alternative embodiment is shown in
It is contemplated that various changes and modifications may he made to the tip assembly without departing from the spirit and scope of the invention as defined by the following claims.
This application claims the benefit of U.S. application Ser. No. 60/911,011, filed Apr. 10, 2007.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/US08/59288 | 4/3/2008 | WO | 00 | 10/6/2009 |
Number | Date | Country | |
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60911011 | Apr 2007 | US |