Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1992-07-29
1994-06-21
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15345, 15385, 239251, A47L 1130
Patent
active
053218698
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In removing paint from painted surfaces one generally uses solvents that erode the paint or bring cause it to swell up. Subsequently, the paint is removed through mechanical means. The use of solvents leads to a substantial pollution of the environment. Chromate mixed with solvents is difficult to remove from the solvent. Furthermore, a considerable part of the solvents evaporate into the atmosphere.
It is known that a high-energy air jet having abrasive particles can be directed against a painted surface. The abrasive particles can be synthetic granulated material, glass spheres, nut shell fragments or CO.sub.2 ice crystals. Such abrasive processes are disadvantageous, wherein not only the paint is removed but also the surface underneath the paint is damaged. In particular, when the surface consists of artificially reinforced material, the danger exists that the reinforced fibers will be exposed by the spraying of abrasive material, so that the painted surface, in which the paint is to be removed, will be seriously damaged.
Furthermore, it is known that for cutting concrete and other material and for the purpose of cleaning the facade of buildings high-energy water jets are directed at the surfaces. The process of high-energy water jets is also used for rust-removal and removing shell-lime deposits on off-shore structures, such as, for example, ships and off-shore drilling platforms.
It is an object of the invention to provide a device for the removal of paint from painted surfaces, whereby the pollution of the environment is minimized and the removal of paint from painted surfaces is realized.
In accordance to the invention, the device consists of a rotating head having at least one nozzle, wherefrom a high-energy liquid jet is discharged. The rotating head is caused to rotate by the pressure of the high-energy liquid jet (in particular, through the recoil thereof), so that a separate rotating device in the housing is not required. By the rotation of the rotating head and the nozzle provided thereon, a periodically pressurized admission of approximately 150 to 220 Hz is directed to individual positions of the surface. As a result of the increase and decrease of the pressurized admission, the cohesive force of the paint is overcome and the paint of the surface splinters off. Thereby the lacquered coating as well as the primer can be disengaged. The rotating head is located in the inner part of the housing, the opening of the housing being closed by the surface to be treated.
Thus, the housing encloses the treated area completely. It can be guided over the painted surface by hand or by a suitable guiding device, so that a progressive treatment of the larger surface is possible. Uncontrolled liquids are prevented from being spun into the surroundings by the closed housing. Furthermore, the level of noise is reduced. The liquid and the paint disengaged from the surface is discharged out of the housing by the impeller. The impeller constitutes a centrifugal pump in the inner part of the housing, whereby the pump does not impede the high-energy jet discharged from the nozzles and removes the suspension from the housing immediately after the origination of the suspension. Thereby it is guaranteed that the high-energy liquid jets are not obstructed by a liquid layer that is to be found on the surface.
In accordance to the invention, the device requires only a connection to the housing for the pressurized fluid and no additional drive or supply lead. Thereby, the device is easily guided over the surface to be worked upon.
The device is particularly suitable for the removal of paint from painted surfaces which consist of metal or plastic. Aircrafts have their paint removed and are repainted every four to six years. This removal of paint proceeds in a hangar where other maintenance or repairs to the aircraft are also carried out. The device can be employed without any impairment or danger to people who are entrusted with other duties on the aircraft, whereby the device is always effecte
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patent: 968934 (1910-08-01), Goughnour
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patent: 2695773 (1954-11-01), McGrath
patent: 2846822 (1958-08-01), Steffen
patent: 3428131 (1969-02-01), Winslow
patent: 3441086 (1969-04-01), Barnes
patent: 3624668 (1971-11-01), Krause
patent: 4524550 (1985-06-01), Burke et al.
Deutsche Lufthansa AG
Moore Chris K.
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