Cleaning and liquid contact with solids – Processes – Combined
Reexamination Certificate
2000-06-23
2001-09-11
El-Arini, Zeinab (Department: 1746)
Cleaning and liquid contact with solids
Processes
Combined
C134S038000, C134S042000, C134S0570DL
Reexamination Certificate
active
06287389
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a method and apparatus for paint removal and particularly relates to the removal of painted finishes from automobiles via the utilization of an ultra-high pressure water methodology carried out under robotic control.
BACKGROUND OF THE INVENTION
Presently, the method for the removal of paint from automobiles is by using a combination of hazardous chemical paint strippers and mechanical and hand sanding of the paint from the vehicle's surface. The environmental and worker health problems associated with using chemicals strippers are of epidemic proportions. All of the major automobile manufacturers have issued disclaimer notices to their dealerships that prohibit the use of chemical strippers and outline that the only approved method for stripping/removing the paint from their automobiles is by using a single edge razor blade. This recommended razor blade method is never used as it would require months to strip a vehicle and would destroy the original factory primer which is electrostacially applied.
Coating removal technology has typically accomplished removal of coatings such as alkyd primers, alkyd topcoats and acrylic nitrocellulose topcoats with solvent-based strippers which employed, for example, methylene chloride as a major component. However, the use of such materials is now prohibited as they are on the OSHA/EPA toxic materials listing.
Chemical paint strippers are also inappropriate for the removal of protective coatings from non-metallic organic matrix composite materials, for example those utilized for bumpers, grills, side view mirrors and similar structures previously formed as molded metallic articles. Chemical paint strippers cannot be used for paint removal from such composite materials because of the high risk of the stripper chemically attacking organic components of the material.
Alternative stripping processes, for example mechanical coating removal by the use of abrasive blasting techniques is one alternative to the use of chemical stripping. Techniques which include the utilization of abrasive media such as crushed corn cobs, glass beads, plastic beads, walnut shells, synthetic diamond dust, garnet particles, and dry ice carbon dioxide pellets have been employed in abrasive blasting processes. High pressure fluids such as water have also been used for the removal of coatings. All of these techniques have, however, met with limited success.
Accordingly, a cost-effective and safe arrangement for removing painted coatings would satisfy a longfelt need in the art, particularly if such a method and apparatus was capable of effectively removing coatings from automobiles, without injuring the factory installed primer.
DESCRIPTION OF THE PRIOR ART
U.S. Pat. No. 3,623,909 discloses an electrically heated tool and a method for using the tool in paint removal.
U.S. Pat. No. 4,182,000 teaches a hand held scraper-sander, as does U.S. Pat. No. 4,466,851 which concerns a hand held scraper that is especially suited for removing fragments of a gasket from automobile engine components.
U.S. Pat. No. 4,398,961 is directed towards a fuel combustion heated device and method of use thereof for removing old paint.
U.S. Pat. No. 4,443,271 concerns an apparatus and method used for cleaning floor grates employing high-pressure water jets.
U.S. Pat. No. 3,584,327 discloses an ultrasonic energy transmission system.
U.S. Pat. No. 4,858,264 is directed toward an ultrasonic assisted protective coating removal system, particularly for removing paint or similar coatings from aircraft.
U.S. Pat. No. 5,986,234 teaches a laser-based coating removal system for removal of surface coatings.
U.S. Pat. No. 3,742,076 discloses the use of ultrasonic transducers which are energized by compressed air, pressurized hydraulic fluid or other pressurized fluid sources of energy. The patent suggests that with such larger transducers, mechanically-supported and machine-guided arrangements such as robotic devices which can be programmed for the stripping of a predetermined shape and area may be desirable.
None of the prior art patents address the issue of removal of paints from an automobile surface solely by the use of ultra-high pressure waterjets, nor do they suggest the concept of precise control of such waterjets, as is achieved in the present invention, by the use of a robotically controlled system of operation.
SUMMARY OF THE INVENTION
The present invention provides a computerized apparatus useful for stripping paint from a vehicle, such as an automobile, by utilizing ultra-high pressure waterjet technology in conjunction with a method and apparatus for creating and storing, in a database, digitized maps or templates which may conform to either the original shape of a vehicle, the shape of a vehicle subsequent to a collision, or both. The stored shapes may be retrieved and compared to verify the extent of damage; additionally the stored shapes may then be retrieved as needed and used to drive a precision ultra-high pressure waterjet nozzle constructed and arranged for removal of the painted finish from the vehicle's surface.
The present invention is capable of selectively stripping away various layers of paint from the entire vehicle or from selected body areas leaving the original factory primer intact and undisturbed.
The instant invention utilizes a controlled automobile paint stripping system which only requires a single operator positioned outside the stripping booth at a computer console. A rotating nozzle having a multiplicity of waterjets similar to a showerhead rotating is maintained at a controlled distance from the surface of the automobile and directs ultra-high pressure water for selectively removing one or more layers of paint. The pressure of the water can vary from 25,000-60,000 psi. depending on the volume of water and pressure used and the standoff distance from the automobile.
Accordingly, it is an objective of the instant invention to provide an ultra-high pressure water assisted paint/protective coating removal method and apparatus.
It is a further objective of the instant invention to provide a paint/protective coating removal apparatus which operates with a degree of precision sufficient to selectively remove one or more layers of paint/protective coating without damage to the underlying primer or substructure.
It is yet another objective of the instant invention to provide an apparatus and method for removal of paint/protective coatings wherein the apparatus and method utilize a computer for storing vehicular shapes in a structured database, and a computer driven coating removal device for precision and selective removal of one or more layers thereof.
It is another object of the invention to provide a paint/protective coating removal arrangement which is suitable for use in combustible or other hazardous environments.
It is another object of the invention to provide a paint/protective coating removal arrangement which is safe for use with respect to the environment and with respect to human operators.
It is still a further object of the present invention to provide an apparatus and method for paint/protective coating removal wherein the method includes the step of progressively adding new vehicular shapes to the database including the steps of downloading archived vehicular shape digitized files or alternatively photographing the vehicle and scanning the photograph to digitize the image for downloading, comparing the stored versus the present images to assess vehicular damage, and utilizing the digitized shape to direct the paint/protective coating removal via ultra-high pressure water.
Other objects and advantages of this invention will become apparent from the following description taken in conjunction with the accompanying drawings wherein are set forth, by way of illustration and example, certain embodiments of this invention. The drawings constitute a part of this specification and include exemplary embodiments of the present invention and illustrate various objects and features thereof.
REFERENCES:
patent: 358
El-Arini Zeinab
McHale & Slavin P.A.
Ultrastrip Systems, Inc.
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