Movable suspension arrangement for paint removing devices intended to abut a wall or some other painted surface.
TECHNICAL FIELD: The present invention relates to a removable suspension device for paint removal devices which are intended to be arranged in contact with a wall, a ceiling, a floor, window frames and door frames, windows, doors or a piece of furniture or the like, and which are adapted for treatment of old paint by means of heat radiation. It is required that such devices are removable along the surface which is to be treated and therefore, to this end, the devices must be suspended in a suitable manner.
BACKGROUND OF THE INVENTION:
During renovation of wooden facades on older houses, it is normally required to remove several coats of successively painted unsightly cracked and flaking 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 a member for controlled vertical and horizontal moving of the carrier along the facade. This member for moving the carrier essentially consists of a horizontal rail which is intended to be fastened with screws in the base of the roof, in which rail a movable vertical bar is suspended and in turn supports the actual radiation device which is directed towards the wall. Thus, the radiation member can be moved horizontally by means of the fact that the suspended bar is moved in the horizontal rail, and vertically by means of the fact that it is screwed off and is moved upwards or downwards on the bar. Thus, in this manner, it is possible to reach a reasonably plane rectangular surface.
Of course, the surface which is to be treated is not always constituted by a reasonably plane rectangular surface which is situated on a lower level than the suspension rail. For example, by means of a device according to the above-mentioned patent, it is impossible to reach the highest situated wooden edge on a wall which is defined by two sloping roofs. Furthermore, by means of such a device, it is impossible to reach around a corner, to reach a ceiling, a floor or window frames. Also, although it sometimes is desirable to subject old pieces of furniture to a heat treatment according to this method, it is not possible to execute this treatment on pieces of furniture by means of the device according to the above-mentioned patent.
As a result of this, there has for a long time been required that it would be possible to perform this known heat treatment with subsequent scraping in a more flexible manner, by means of which it would be possible to reach all possible surfaces for radiation. Therefore, according to the present invention, a removable suspension device for paint removal devices has been provided, which paint removal devices are intended to be arranged in contact with a wall, a ceiling, a floor or the like, and which are adapted for treatment of old paint on the surface by means of heat radiation, which suspension device is characterized by a horizontally pivotable arm, one end portion of which is vertically displaceable and horizontally pivotably arranged on a bar which is adapted for vertical mounting on a wall or the like, and the other end portion of the arm supports one or several paint removal devices in a manner which is controllable in all directions.
According to the invention, it is suitable that the mounting of the arm on the bar is constituted by a casing which is pivotable around the bar and is connected with the arm, said casing being supported by a ring which is fastened with screws to the bar beneath the casing and is vertically displaceable on said bar.
According to the invention, the device which is intended for suspension of the paint removal devices comprises a clampable, horizontally pivotable bar which is inserted into the arm end, around which bar a clampable, horizontally pivotable casing is mounted, the outer end of which supports a transverse bar on which the paint removal devices are pivotably mounted in a crosswise plane in relation to the bar.
According to the invention, it is suitable that each link on the arm consists of two rigid metal or plastic bands or profiles which are vertically situated at a distance from each other and which are rigidly connected with each other at their end portions and preferably comprise oblique stiffening struts.
According to the invention, the various links are suitably connected with each other by means of rivets and screws for adjustment of the friction between the contact surfaces of the links.
According to the invention, a tension spring for pressing the arm against the wall is suitably provided between the link which is provided on the bar and the displaceable ring on the bar.
The supporting bar according to the invention is suitably arranged to be fastened with screws on a wall or the like, wherein said bar is fastened at a certain distance from this by means of brackets at the upper and lower end portion of the bar.
BRIEF DESCRIPTION OF THE 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 suspension device according to the present invention on which a paint removal device is mounted,
Fig. 2 is a top view of a part of the suspension device on which paint removal devices are mounted, and
Fig. 3 shows the same as Fig. 2 but wherein only one single paint removal device is arranged.
Fig. 1 shows a suspension device according to the invention comprising an arm which in the present case consists of three links 1, 2 and 3. The arm can also consist of several links, of only two links and of one single link. These links consist of two metal bands 4 and 5 which are vertically situated at a distance from each other. The bands are attached to each other at their end portions by means of rigid uprights 6 or, as is the case as regards the first link 1, by means of a casing 7 at the internal suspension end. In order for the links to have sufficient strength, the links are provided with oblique stiffening struts 8. At the outermost link 3, the lower band 5 functions as strut since it is oblique.
The links are connected with each other by means of rivets 9 and screws 10. The rivets 9 are provided so loosely that the links can rotate in relation to each other and so that the friction between the contact surfaces on the adjacent links can be adjusted by means of the screw 10. Of course, it is important that the links are not too loosely arranged in relation to each other, but it is also important that the force which is required to rotate the links in relation to each other is not too large. The links, which can consist of aluminium, are preferably formed by casting.
As mentioned above, the innermost link 1 is provided with a casing 7 at its internal end portion. Via this casing 7, the whole arm is suspended on a vertical bar or tube 11 which is inserted through the casing 7. The casing 7 can be revolved around the bar 11 and can be moved upwards and downwards on the bar. It rests, however, on a ring 12 which is fastened with screws on the bar 11. This ring 12 can easily be screwed off and be moved upwards or downwards, wherein the vertical position of the arm also can be changed.
The bar 11, on its part, is suitably fastened with screws on a wall 13 or similar by means of brackets 14 at both ends of the bar. Instead of the bar 11 being fastened with screws on a wall 13, it may also be provided on a stand which, for example, may be provided with wheels so that it can be moved in an unlimited manner. Of course, this is preferable if the device is intended for treatment of pieces of furniture which are situated in a room.
For practical reasons, the arm is suitably pressed by means of a certain force against the wall or the like which is to be treated. Therefore, according to the invention, a tension spring 15 has been arranged between the mounting ring 12 and the innermost link 1. Therefore, during the assembly before the work starts, the ring with the mounting point for the spring 15 is rotated towards the wall, whereupon the ring is locked. As a result of this, a force which is directed towards the wall will occur.
At its end portion, the outermost link 3 on the arm is slightly different formed than the rest of the links. Thus, the connecting upright 6 at this end portion is much shorter than at the other end portion. Outside the connecting upright 6, a dowel 16 is inserted into the link. This can be turned horizontally, but it can also be locked by means of the handle 17.
On this dowel 16 outside the link 3, a casing 18 is provided which can be revolved around the dowel 16. This casing can be locked by means of the lock arm 19.
At its end portion, this casing 18 supports a transverse bar 20 which in turn supports the actual working device 21, i.e. the paint removal device. The paint removal
device 21 is pivotable in a vertical plane around this bar 20 and can be locked by means of the hook 22.
Thus, by means of this suspension device, the paint removal device 21 becomes pivotable in all directions. Consequently, it can be directed obliquely upwards, straight upwards, straight downwards or sideways. Due to the fact that the arm is pivoted, it can also be turned around corners and it can be directed towards limited surfaces such as window frames and the like.
Fig. 2 shows the external part of the arm on which a paint removal device 21 is mounted. The same reference numerals in the two drawings refer to the same elements. As is apparent from this drawing, three paint removal devices are provided, wherein the two outermost devices and their handles are fastened with screws to the bar 20.
Fig. 3 shows roughly the same as Fig. 2, but here, the bar 20 has been made shorter and in this case only suspends one single paint removal device 21. Thus, by varying the length of the bar 20, it is possible to vary the number of paint removal devices 21 on the arm. Of course, this is a great advantage when one wishes to treat only a narrow surface, e.g. a window frame.
Thus, by means of the present invention, a very flexible suspension device for paint removal devices has been provided which is useful for the most different occasions. Consequently, the device can be fastened with screws on both walls and other devices, and it can reach around corners, be turned upwards and downwards and be tilted in the desired direction, and it can be raised and lowered in a very simple manner. It can also be utilized for softening of such a narrow strip as putty. Due to the fact that aluminium is used as material in both the paint removal devices and the suspension device, the device
becomes very light and handy. It is, however, according to the invention, possible to use other materials, e.g. steel bands in the arm and also plastics of suitable kinds, particularly in the reinforcing struts.
The invention is not limited to the embodiment which is described above, but may be varied within the scope of the appended claims.