Fluid sprinkling – spraying – and diffusing – Including supplemental gas shaping or shielding jet – Plural sets of gas jet orifices
Reexamination Certificate
2000-11-28
2004-02-03
Hwu, David D. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including supplemental gas shaping or shielding jet
Plural sets of gas jet orifices
C239S291000, C239S600000, C239S690000
Reexamination Certificate
active
06685106
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a paint spraying device and more particularly to a high volume, low pressure device to pattern shape the atomizing and fan air.
BACKGROUND OF THE INVENTION
Paint spray devices, or guns, were usually operated at high pressure to atomize the paint and to adjust the spray patterns due to the wide availability of high pressure air. However, the coating transfer efficiency was less than optimum at the high pressures and an undesirable amount of coating material was dispersed into the environment. This led to an increased use of high volume low pressure (HVLP) air operated spray guns due to improved coating transfer efficiency and decreased air pollution. Several approaches have been used to provide the low pressure air and also have high volume air flow. Some of these are disclosed in the following:
U.S. Pat. No.
Inventor(s)
5,064,119
Mellette
5,090,623
Burns et al
5,135,172
Toth
5,165,605
Morita
5,178,330
Rogers
5,209,405
Robinson et al
5,249,746
Kaneko et al
Also, variations have been proposed for the configuration of a cap to direct the flow of the fan air and the atomizing air to form the spray pattern of the paint as in the following:
U.S. Pat. No.
Inventor(s)
3,578,249
Davis
4,228,958
Perry
4,502,629
McGhee et al
4,660,771
Chabert et al
4,767,057
Degli
4,961,536
Correard
5,613,637
Schmon
However, there still remains a need for improved paint spraying devices, especially devices which can be used in electrostatic painting procedures.
BRIEF SUMMARY OF THE INVENTION
It is an object of the invention to provide a more efficient high volume low pressure device for spraying paint.
It is a further object to provide very compact device which has high access to confined areas when the device is attached to a robot arm.
In accordance with the teachings of the present invention, there is disclosed a device for spraying paint with a body having a first end and an opposite second end. A nozzle is attached to the first end of the body. Means are provided for introducing fan air and atomizing air into the body, and means are provided for controlling the flow of paint through the device. At least one slot for the atomizing air and at least one slot for the fan air are formed in the body for exiting of the respective atomizing air and fan air from the first end of the body such that low pressure air is applied to the paint and high volume atomized paint is provided by the device.
Further in accordance with the teachings of the present invention, there is disclosed a device for spraying paint with a body having a first end and an opposite second end. Means are provided for introducing fan air and atomizing air into the body. A replaceable cartridge is disposed in a center bore in the body, the cartridge having at least one piston, a needle valve, and at least one spring. Activation of the at least one spring moves the needle valve and the at least one piston to introduce paint, atomizing air and fan air into the device.
In another aspect, there is disclosed a device for spraying paint having a body connected to a nozzle, an air cap covering the nozzle, an air cap nut securing the air cap to the body and means for controlling the flow of paint, atomizing air and fan air through the body. An improvement provides means for directing a portion of the fan air between the air cap and the air cap nut such that fan air passes over an outer surface of the air cap and assists in directing the paint spray.
REFERENCES:
patent: 3578249 (1971-05-01), Davis, Sr.
patent: 3791579 (1974-02-01), Cowan
patent: 3900163 (1975-08-01), Volker
patent: 4228958 (1980-10-01), Perry
patent: 4273293 (1981-06-01), Hastings
patent: 4502629 (1985-03-01), McGhee et al.
patent: 4539932 (1985-09-01), Vecellio
patent: 4660771 (1987-04-01), Chabert et al.
patent: 4767057 (1988-08-01), Degli et al.
patent: 4961536 (1990-10-01), Correard
patent: 5064119 (1991-11-01), Mellette
patent: 5090623 (1992-02-01), Burns et al.
patent: 5135172 (1992-08-01), Toth
patent: 5165605 (1992-11-01), Morita et al.
patent: 5178330 (1993-01-01), Rodgers
patent: 5209405 (1993-05-01), Robinson et al.
patent: 5249746 (1993-10-01), Kaneko et al.
patent: 5265801 (1993-11-01), Larson
patent: 5613637 (1997-03-01), Schmon
patent: 5676310 (1997-10-01), Hynds
patent: 6089471 (2000-07-01), Scholl
Armstrong Kratz Quintos Hanson & Brooks, LLP
EFC Systems, Inc.
Hwu David D.
LandOfFree
Paint spraying device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Paint spraying device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Paint spraying device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3335077