Electric resistance heating devices – Heating devices – Radiant heater
Reexamination Certificate
2000-05-09
2001-10-16
Jeffery, John A. (Department: 3742)
Electric resistance heating devices
Heating devices
Radiant heater
C392S423000
Reexamination Certificate
active
06304721
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a device for providing heat radiation of a surface which preferably is intended to be radiated for softening and removing old paint or drying of moisture. The heat radiation from the device is intended to be obtained by means of electric resistance wires arranged in an open box.
BACKGROUND OF THE INVENTION
During renovation of wooden surfaces on older houses, it is normally required to remove several coats of successively painted unsightly cracked and flaking oil- and/or plastic-based paint. Various methods are available for executing this work, wherein the removal of the paint for example can be carried out by means of scraping or grinding, which either implies a great effort of costly manpower or diffusion of ecologically harmful dust and disturbing noise. Previously, blow torches have also been utilized in order to burn off paint or rather to soften the paint by means of heating, so that it would be easier to scrape the paint off the wood. Caustic solutions or strong hydrocarbon-based solvents have also been utilized for removal of paint from wooden facades. All of these methods involve various disadvantages.
As a result of this, there has recently been a change to a method which implies that the paint is softened by radiation by means of a source of infra-red radiation. Thereafter, the paint is immediately removed by means of mechanical treatment of the wooden surface. Such a method and a device for execution of this method is described in the swedish patent 9000763-4. Apart from the radiation member, the device according to this patent also consists of members for controlled vertical and horizontal moving of the carrier along the facade, which makes it possible to reach a reasonably plane rectangular surface.
TECHNICAL PROBLEM
Although the known device according to what is described above operates satisfactorily, it is heavy and bulky having a weight in the neighbourhood of 4 kilo, and it is awkward to transport. The construction is relatively complicated and it is therefore costly to manufacture. It can not be minimized or enlarged by removal of components and the utilization is consequently limited to such surfaces which, on the one hand, are suitable for the device and, on the other hand, can be reached by the device.
During heating of surfaces with old paint and similar coatings, an evil-smelling and poisonous smoke is produced which consists of decomposition products of the paint or the other coating and partly of the substrate. Due to the fact that this smoke is warm, it rises and diffuses in the environment, by means of which the smoke constitutes a big environmental problem.
SOLUTION
As a result of this, there has for a long time been a need for developing such a device which, on the one hand, has a low weight, permits mounting on a light and variable suspension device and is adjustable as regards its size and, on the other hand, can be manufactured in an easy and reliable manner and is harmless to the environment. Therefore, according to the invention, a device has been developed for providing heat radiation of a surface, preferably for softening and removing old paint, wherein the heat radiation is intended to be obtained by means of electric resistance wires arranged in a box which opens towards the surface which is intended for treatment, which device is characterized in that the box consists of a main component which is formed by extrusion pressing and which comprises longitudinally extending tracks for mounting of other components forming part of the device, and a lid in each end portion and a longitudinally extending partition wall behind the electric resistance wires.
According to the invention, one of the lids is provided with an exhaust opening which communicates with the space behind the partition wall and the other lid is formed with a suction opening located at the open end portion of the box which communicates with the space behind the partition wall.
According to the invention, it is suitable that the partition wall supports the electric parts.
According to the invention, it is suitable that the partition wall is inserted into longitudinal tracks in the interior wall of the main component.
According to the invention, in order to reinforce the heat radiation and the direction of the radiation, it is suitable that a wave-like reflector is provided in tracks in the interior wall of the main component behind the resistance wires, but in front of the partition wall.
According to the invention, in order to maintain a suitable distance between the device and the surface which is to be treated, and in order to absorb generated smoke more effectively, it is suitable to provide adjustable distance holders towards the surface which is intended for the heat treatment, said distance holders being in the form of displaceable walls and being provided on each side of the opening of the box towards the surface.
Furthermore, according to the invention, it is advantageous to provide tracks on the outside of the backside of the box for insertion and mounting of a handle unit.
According to the invention, in order to adjust the size of the device which is intended to radiate a surface, it is suitable that two or more boxes are coupled together beside each other.
REFERENCES:
patent: 2221318 (1940-11-01), Worthing et al.
patent: 2694135 (1954-11-01), Brockmole
patent: 3242315 (1966-03-01), Fannon, Jr.
patent: 3731055 (1973-05-01), Kerchner, Jr. et al.
patent: 5196674 (1993-03-01), Chartrain et al.
patent: 5590238 (1996-12-01), Ericson
patent: 5668921 (1997-09-01), Essler
patent: 465768 (1991-10-01), None
Fasadteknik International EFO AB
Jeffery John A.
Lerner David Littenberg Krumholz & Mentlik LLP
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