BRIEF DESCRIPTION OF DRAWINGS
The invention will be further described in the following with reference to the annexed drawings, in which
FIG. 1 is a side view of a paint removal device comprising heat radiation elements,
FIG. 2 is a vertical section of the device according to FIG. 1,
FIG. 3 is horizontal section of the device according to FIG. 1
FIG. 4 shows a reflector unit provided with resilient suspensions of the heat radiation elements.
FIG. 5 is view of the reflector element in FIG. 4 mounted in a casing to form a paint removal device
FIG. 6 is a schematic drawing showing different principles of how to attach heat radiation element resilient with respect to a casing
EMBODIMENT(S) OF THE INVENTION
FIG. 1 shows a side view of a paint removal device suitable for the present invention having a casing 1 which is formed by extrusion pressing and preferably made of aluminium. At its upper end portion, the device is provided with a lid 2 having a suction opening 3 for smoke, and a lower lid 4 which is provided with a tube dowel 5 for connection to a suction device. When the device is utilized, heat radiates from the device to the left in the drawing, as is indicated by the arrows. On each side of the casing 1 towards the surface which is to be treated, two distance holders 6 are provided, one of which, the left in the direction of the radiation, is shown in the drawing. These distance holders 6 are made in the form of wall pieces or plates which are in close contact with the surface being treated and, therefore, they enclose the working surface at the sides. The distance holders 6 are provided with slots 7, so that they can be screwed on by means of these and be moved forwards or backwards. As is apparent, the device according to this drawing is provided with a handle unit 8 which has been inserted into tracks on the backside of the main component. The handle unit 8 is fixed to a supporting arm 9.
FIG. 2 shows a longitudinal section through the device having mounted lids 2, 4 and a handle 8. Longitudinal tracks 10 are provided on several locations on the inside and the outside of the casing 1. These tracks are constructed in connection with the extrusion pressing and constitute insertion and mounting brackets for various components.
In two of these tracks, one on each side of the casing 1, a partition wall 11 has been inserted. This partition wall 11 supports resilient holders 12 for the heat radiation elements 13. For the sake of clarity, the rest of the electric wires and their suspension have been excluded. The electric resistance wires can, however, be replaced by other electric heating devices, such as microwave devices.
Behind the heat radiation elements 13 but in front of the partition wall 11, a blank reflector 14 is provided. The reflector 14 is also inserted into a track on the inside of the casing 1.
The lid 2 in the right side of the drawing is intended to form the upper side of the device and fumes are sucked in through the opening 3 in this lid and flow downwards behind the partition wall 11 and out through the lid 4 having a mounted exhaust tube 5. Thus, this exhaust tube 5 is connected to some kind of fan which blows the fumes into some kind of purification plant. In the drawing, the course of the fumes is shown with unfilled arrows. The direction of the heat radiation from the device is shown with filled arrows.
FIG. 3 shows a horizontal section through the device according to the invention, from which drawing the location of the partition wall 11 and the reflector 14 is apparent. Due to the fact that two heat radiation elements 13 are provided, the reflector 14 has obtained a wave-form which guarantees a concentrated radiation of the surface.
As is apparent from the drawing, a plate 15 for electric devices is provided on the partition wall 11 and on the backside of this.
As is apparent, the handle unit 8 is inserted downwards in tracks on the outside of the casing 1, and two distance holders 6 are fastened with screws on each side of the opening of the main component 1 towards the side surface being treated.
FIG. 4
a is an isometric view of a reflector 14 to which two heat radiation elements 13 are attached. Each of the heat radiation elements 13 are attached to the reflector 14 by means of four resilient holders 12. The resilient holders 12 are in this case in the form of frustoconical helical springs. As can be better seen in FIG. 4b, the springs 12 are attached to the reflector 14 by screws 16. There might of course also be other way of attaching the springs 12, e.g. by welding or by shaping the end of the spring 12 which is attached to the reflector 12 so as to fit into a hole made in the reflector 14.
As can be seen in FIG. 4a, the reflector 14 comprises a backing plate 17 and two side plates 18 forming an elongated, U-shaped reflector 14 so that the reflector 14 partly encloses the heat radiation elements 13.
FIG. 5 shows a side view of the reflector 14 in FIG. 4 as seen from its short side when mounted in a casing 1 with its side lid dismounted. The front side 19 of the backing plate 17 faces the heat radiation elements 13 and the backside 20 of the backing plate 17 faces the casing 1. In use, the paint removal device will be positioned so that the casing 1 and the reflector 14 are open towards the surface intended for treatment, i.e. the front side 19 of the backing plate 17 is facing the surface to be treated. In this embodiment, there is no separate partition wall 11 but the reflector 14 also forms an integrated partition wall 11. Furthermore, the reflector 14 also functions as a mounting plate 21 for the heat radiation elements 13. The heat radiation elements 13 are resiliently attached to the reflector 14 by springs 12. The reflector 14 is attached to the casing 1 by means of longitudinal racks 10 wherein flanges of the reflector 14 are fitted to form a rigid connection 22. In this case, it would be possible to add some extra resiliency by positioning a resilient material between the racks 10 and the flanges of the reflector 14 so as to achieve a resilient attachment between the casing 1 and the reflector 14.
FIG. 6 is a schematic view of different principal solutions for making the resilient suspension arrangement of the paint removal device.
In FIG. 6a, the resilient holders 12 attaching the heat radiation elements 13 are attached directly to the casing 1.
In FIG. 6b, the heat radiation elements 13 are attached to a mounting plate 21 by resilient holders 12. The mounting plate 21 in turn is attached to the casing 1 by rigid holders 22. Hence, the principle of the resilient suspension arrangement described in FIG. 6b corresponds to the principle described in FIGS. 4 and 5 in which the heat radiation elements are resiliently attached to a combined reflector and mounting plate which is rigidly connected to a casing.
In FIG. 6c, the heat radiation elements 13 are attached to a mounting plate 21 by rigid holders 22. The mounting plate 21 in turn is attached to the casing 1 by resilient holders 12.
In FIG. 6d, the heat radiation elements 13 are attached to a mounting plate 21 by resilient holders 12b. The mounting plate 21 in turn is attached to the casing 1 by resilient holders 12a. In this case it would be possible to allow one of the attachments, 12a or 12b, to be rigid in certain directions if the other attachment compensates with resiliency in that direction if a resiliency in all directions is desired.
It shall be noted that the mounting plate 21 in these examples may be a separate unit or form part of a partition wall, a reflector or both of them. In FIGS. 1-3, the paint removal device described is provided with an arrangement for suction and handling of exhaust gases. It is obvious that the suspension arrangement would work as well in a device without such an arrangement.
The invention is not limited to the embodiment which is described above, but may be varied within the scope of the appended claims.
Patent Application
20070280654
