DE4222766A1 - Hand-held polishing machine for painted surfaces - has water based cutting fluid fed to rotating absorbing disc rotated over painted surface - Google Patents

Abstract

The polishing machine has a rotating polishing head (12) driven by an electric motor (28). The head is fed with a metered supply of the water based cutting fluid. The operator holds the machine onto the surface and moves it to polish as required. The fluid feed rate is adjustable and surplus fluid is thrown out by centrifugal force. Excess fluid can be picked up by a surrounding flexible cowl linked to a suction line. The rotating head can be a foam pad preferably conical in shape and set into a conical recess to form a cylindrical disc. The joining conical surface is formed by a waterproof adhesive layer. The polishing head is cleaned by holding it over a rotating brush and with water feed. USE/ADVANTAGE - Cleaning paintwork of vehicles prior to waxing. Minimum of manual effort to prepare paint surfaces, adjustable polishing effect.

Description

The invention relates to a cleaning-polishing device a hand-held device, by means of its surfaces, in particular painted surfaces of motor vehicles from firmly adhering the particles such as B. industrial dust or weathered Lacquer that can be cleaned and polished.

The cleaning and polishing of painted surfaces Motor vehicles with on a polishing cloth or a polisher sponge-applied fluid polishing agents, so-called polishes, is a tedious job, especially when the polishing lacquers are already very old and weathered as well stuck particles, such as tar or industrial dust ten, so that considerable amounts of lacquer ent during the polishing process must be removed to remove the adherent particles Bring a still and perfect paint to the surface gene, which is smoothed so that get on the paint the water contracts like a pearl and therefore not in the paint surface penetrates. For heavily weathered paints needs an experienced person to paint a person motor vehicle up to two days.

It has also become known, the hand-applied one Polish after drying with one on a turn to remove the disc-arranged lambskin, but the the actual polishing process must be carried out beforehand by hand had to.

You already have grinding pastes on rotating sponges applied and tried in this way, paint surfaces to polish more efficiently. But here is the problem that the grinding paste is renewed at regular intervals must be and that if the speed is too high on a  Turntable arranged sponge the paint so heated can become softened and damaged.

The aim of the invention is another Reini polishing device and a cleaning polishing process to create for painted surfaces in particular. In particular the new cleaning-polishing device or the new cleaning-polishing process the time for you Polishing process can be significantly reduced Stress on the operator and less Polishing result can be significantly improved.

To solve this problem, the features of the patent claims 1 and 19 provided.

The basic idea of the invention is that when machine cleaning and polishing constantly a grinding poli tur-water mixture is supplied, so that the requ amount of grinding polish or grinding paste or Abrasive is available and at the same time through the Water content such cooling of the polished lacquer top Area is achieved that a damage to the polishing result Liche overheating of the paint is safely avoided, too when working with high polishing speeds. Of the Water content also helps to clean the surface at. According to the grinding polish-water mixture either immediately before use by merging are formed by two lines, one of which is what The other feed is used for grinding polish feed. Before However, it is widespread when grinding polish and water in one Premixed container and then together the grinding process can be supplied as a mixture.

A so-called flex can be used as the handheld device already with a central fluid supply within the  Turntable is provided. A circle is placed on the turntable cylindrical polishing sponge put on and z. B. means attached with a Velcro fastener. In the sponge is ever but previously a central hole in which the Grinding polish-liquid mixture flows out. When rotating the turntable and feeding the grinding polish liquid This mixture flows along the central bore to the polishing surface, where it is by centrifugal force is thrown radially outwards or conveyed to finally the entire polishing surface of the hard sponge wet. The sponge also sucks some of the liquid or the polish, so that even with periodic actuation a mixture control valve always sufficient polish and Cooling water is available. Instead of the sponge can another flexible, non-scratchy flat mate rial can be used. The absorbency of the material is advantageous, but not absolutely necessary.

A preferred liquid supply control device, d. H. the supply of the grinding polish-water mixture is through Claim 2 marked.

A preferred embodiment of the liquid supply means one takes from the claims 3 to 5.

The formation of the sponge is preferably a hard sponge according to claim 6.

The liquid supply is expediently carried out in accordance with Claim 7.

The embodiment is for the formation of the sponge expedient according to claim 8, wherein the round hard sponge also can protrude radially beyond the turntable.  

The embodiment according to claim 9 is particularly preferred, because this ensures optimal liquid distribution over the Polishing surface of the polishing sponge is achieved. Through the cone-like shape of the sponge is achieved due to that the centrifugal forces into the interior of the sponge liquid entering parallel to the conical surface in Rich movement of the polishing surface. Since there are fewer rivers radially on the outside liquid is available, the cone-like effect here Extension particularly advantageous.

The embodiment can be practically manufactured according to Claim 9 in that from a circular cylindrical Sponge in which the central hole has been made cut out a conical piece and then using a liquid-impermeable adhesive is glued in again. Then the adhesive layer forms a liquid barrier that prevents that from the abrasive polish-water mixture existing liquid in the behind the water barrier areas of the sponge.

Basically, the grinding polish-water mixture container ter be arranged on the polisher itself. Is preferred however, the embodiment according to claim 10, because here can work with larger amounts of liquid. At for example, 10 liters of grinding polish can be Water mixture can be accommodated, what for the polish two passenger vehicles is sufficient.

To be independent of compressors, the execution is Form according to claim 11 useful. The polishing process performing person can thus for the liquid supply necessary pressure even by opening beforehand pumping the container are available. The pressure is supposed to be constructed according to claim 12. In this case can drop to about 1 atm with the pressure  polishing device according to the invention are worked.

The speed of the turntable should be selected according to claim 13 be what, on the one hand, a sufficiently large working speed ability and, on the other, taking into account the cooling effect of the liquid is an overuse of the Avoids paint surface.

It is particularly important that according to claim 14 with Water-mixed grinding paste is free of wax or silicone. Wax and silicone lead to sticking and bonding darning the sponge, so that even if one is provided Sponge cleaning is not long enough with the polishing device direction can be worked.

Particularly preferred mixing ratios can be found Claim 15. Such a low grinding paste or grinding Policy add-on like 10% is enough when polishing new vehicles out. About 1/4 is used for normally weathered paints Grinding polish and 3/4 water. In extreme cases it can but also with up to 40% polishing in the liquid be mixed.

The sponge according to the invention is cleaned before preferably with a cleaning device according to claim 16 or 17th

The liquid supply in the polishing according to the invention Direction is comparatively low and is generally selected according to claim 18.

Further advantageous embodiments are the Claims 19 to 26 characterized.

The cleaning-polishing process according to the invention is complete  Claim 27 defined. The preferred cleaning of the polish sponge is defined by claims 28 to 30.

A particularly advantageous procedure for the liquid keitszufuhr claim 31, but the sub Refraction of fluid intake no longer than in the claim 24 should last.

Especially for polishing a vehicle in the bottom areas, there is a lot of tar and industrial dust can be, additions according to claim 33 can be used be det.

The invention is described below, for example, with the aid of Drawing described; in this shows:

Fig. 1 is a view of the cleaner-polish inventive hand-held device from the polishing surface side,

Fig. 2 shows a schematic axial section of the cleaning polishing handset according to Fig. 1,

Fig. 3 is a schematic overview view of the entire inventive cleaning polishing apparatus,

Fig. 4 is a schematic cross-section of the polishing pad provided cleaning apparatus of the polishing apparatus according to Fig. 3,

Fig. 5 is a partially sectioned side view of another embodiment of a cleaning and polishing hand tool according to the invention with suction hood and

Fig. 6 is an analog to Fig. 2 partially sectioned side view of an embodiment with suction channels.

According to FIGS. 1 and 2 according to the invention comprises cleaning polishing handset 19, a rotary shaft 26 which can be driven via a geeig net designed transmission 27 by an electric motor 28 to a rotational movement with about 2000 rpm. The electric motor 28 can be connected to a power network via a switch 37 and a power cord 29 .

At its end emerging from the housing 30 of the hand-held polishing device 19, the rotary shaft 26 carries a flat turntable 11 running perpendicular to its axis, to which an essentially circular-cylindrical polishing sponge 12 is fastened. From the initially circular cylindrical polishing sponge is first cut out a conical piece and then glued again by means of an adhesive 31 forming a water barrier, so that the polishing sponge 12 has a front active area 12 'and a rear non-active area 12 '', which by a water barrier layer 31 are separated. The water barrier layer 31 represents a conical surface widening from the turntable towards the polishing surface 18 .

The hard sponge 12 is, for example, by means of a Velcro fastener 32 only schematically indicated on the rotary disc 11 rotatably attached.

The sponge 12 has a central through bore 21 which is aligned with the axis of the hollow drive shaft 26 and is exaggerated in the drawing for clarity.

Through the hollow shaft 26 , a liquid supply line 13 extends into the first third of the sponge bore 21 . For this purpose, the turntable 11 also has a through bore corresponding to the inside diameter of the hollow shaft 26 in the middle.

The liquid supply line 13 emerges from the top of the housing 30 and has a schematically indicated valve 20 , which can be opened by the operator by pressing a hand lever 33 . In the unpressed state, the valve is held in the closed position by a schematically indicated spring 34 .

According to FIG. 3, the input side of the valve 20 is fluidly connected via a tube 16 to the lower portion of a Flüssigkeitsbehäl ters fourteenth In the container 14 is a grinding polish-water mixture 15 , which, however, only partially occupies the inner space of the container 14 , so that there is still an air cushion 22 .

From the top an air pump is pressure-tightly inserted into the container 17, by means of actuation of a handle 35 in the pressure-tight sealed container 14, a pressure of eg. B. 2 atü can be built up, which is readable on a measuring device 36 bar. By unscrewing the air pump 17 , the grinding polish-water mixture can be filled into the container 14 from above to the desired height.

With the polishing device described, the Invention according to the following procedures:

First, an abrasive polish-water mixture is filled into the container 14 up to about half the height, which contains about 25% abrasive polish and 75% water. The mixing can take place in the container 14 itself. After screwing on the air pump 17 , an intimate mixing of the grinding polish or grinding paste with the water entered can be brought about by shaking.

Then a pressure of about 2 atm is then built up by actuating the handle 35 inside the container 14 .

Before the actual polishing process is started, the polishing sponge 12 is first moistened somewhat from the polishing surface 18 in order to promote wetting with the grinding polish / water mixture which is subsequently supplied.

At the beginning of the polishing operation, the electric motor 18 is turned on, for example, via a manually operable electric switch 37 (Fig. 2), whereupon the polishing pad 12 rotates at a speed of about 2000 rpm.

The valve 20 is subsequently then by briefly opening through the liquid supply pipe 13, the grinding Poli tur-water mixture into the bore 21 of the hard sponge 12, where it is pressed by the centrifugal force radially outwardly, and finally to wet the entire polishing surface of the sponge 12th

Now you can start the polishing process. Here, the valve 20 is briefly opened every 3 to 5 seconds by actuating the hand lever 33 , in order to introduce some grinding polish / water mixture into the bore 21 again in corresponding short bursts of less than 1 second. As a result, new grinding polish and cooling water are constantly supplied in the required amount. As a result, the sanding process is always carried out with uniform amounts of sanding poli, and the amount of water required to avoid overheating of the polished paint is also supplied.

In this way, the grinding process is continued until the container 14 is empty. Then new grinding polish and new water can be poured in and the process begins again.

After the polishing surface 18 of the polishing sponge 12 always adheres to abraded paint residues, a sponge cleaning must take place after working for about 5 to 10 minutes, which according to the invention is most easily done with the cleaning device shown in FIG. 4. This consists of an inverted brush arranged in a liquid container 38 with a central water supply tube 24 , which, however, does not extend to the height of the brush.

If cleaning is to be carried out, the cleaning device 25 is supplied with water through a supply hose 39 , which emerges as a schematically indicated spray jet 40 from the upper end of the brush 23 , where the polishing surface 18 of the polishing sponge 12 is now brought from above. The polishing sponge 12 is now pressed against the brush from above by switching on the electric motor 28 , the paint residues being detached from the brush and being washed away by the water spray jet 40 . This effect can be supported by briefly opening the valve 20 of the hand polishing device 19 , so that grinding polish / water mixture serving as a rinsing liquid is now also supplied from the inside of the polishing sponge 12 . After a few seconds, the polishing sponge can be completely cleaned of paint residues, so that it is then available again for the continuation of the actual polish.

The liquid supply pipe 13 may only extend about 1/3 into the polishing sponge 12 , as is shown in FIG. 2, so that there is no contact between the lower mouth of the pipe 13 and the painted surface. A certain wear of the polishing sponge in the course of several motor vehicle polishes is also to be considered.

In the following figures, the same reference numerals denote ent speaking components as in the previous description.

FIG. 5 is around the polishing pad 12 around a suction hood 41 is arranged, that of the cleaner-polish hand-held device 19 is attached to housing 30. The suction hood 41 consists of a conically expanded rigid upper part 53 and a bellows 50 surrounding the circumference of the polishing sponge 12 , which is closed at the bottom by a rigid ring 51 which wel cher from a surface 52 of the surface to be polished non-scratching material such as . B. felt can exist. The ring 51 normally protrudes slightly beyond the polishing surface 18 and then lies on the surface 52 to be polished during the polishing process, as can be seen from FIG. 5.

The bellows 50 is particularly suitable for an embodiment of the polishing sponge according to FIG. 2.

In Fig. 5 another embodiment of the polishing pad 12 is shown, in which the piercing circle 44 of the interface 31 between the areas 12 'and 12 ''is in the outer edge region of the polishing surface 18 and not - as in the embodiment of FIG. 2 - at 45 on the cylindrical circumference of the polishing sponge 12 .

In the arrangement of the interface 31 of FIG. 5, however, is in the region of the polishing surface 18 and in a particular Ab stand them an annular interruption 31 'of the otherwise water-tight interface 31 is provided to which a extending from the polishing surface 18 away and outwardly waterproof layer 42 connects, which forms a puncture circle 45 with the peripheral surface of the polishing sponge 12 . In this embodiment, the suction hood 41 expediently extends approximately up to the height of the piercing circle 45 and preferably somewhat above the fixed ring housing 43 .

This embodiment has the advantage that the suction hood 41 does not have to touch the surface 52 to be polished.

The purpose of the cover is to intercept the radially outward flowing liquid during the rotation of the sponge 12 before tangential spraying and to drain through a suction pipe 54 to a suitable collecting container, which is not Darge.

If the ring housing 43 is seen instead of the bellows 50 , the radially flung from the area 12 'liquid will pass through the interruption 31 ' to the waterproof layer 42 , where it rises and finally exits above the lower edge 43 'of the ring housing 43 and is discharged into the suction pipe from the suction in the suction hood.

In the sponge embodiment according to FIG. 2, the liquid which is thrown out laterally during polishing emerges further below, so that the embodiment with the bellows 50 according to FIG. 5 should be used here.

Fig. 6 shows another way to suck off the radially flung liquid so that the operator does not have to protect himself from tangentially flung liquid by protective clothing. Here, suction channels 46 are provided radially on the outside in the polishing sponge 12 and radially in the turntable 11 and open into a suction space 48 around the tube 13 . The space between the line 13 and the wall of the bore 21 is sealed abge by an annular seal 47 . A suction pipe connected to the suction space 48 carries off the liquid sucked off through the suction channels 46 . The embodiment according to FIG. 6 has the advantage that an exhaust hood is avoided.

In the embodiment according to FIG. 5 it is important that the waterproof layer 42 of the lacquer does not damage the material, since this layer 42 extends directly to the polishing surface 18 and is also somewhat sanded off in the course of the polishing process.

The wear of the polishing sponge 12 may go so far that the piercing circles 45 on the circumference of the polishing sponge 12 cannot yet be reached from the area of wear.

Another aspect of the invention is that by replacing the polishing sponge 12 by a rotating brush with the same cleaning-polishing device 19 , pre-cleaning can also be carried out. For this purpose, the same liquid supply pipe 13 can be used, through which, for. B. fluoric acid or another cleaner is introduced. The brush instead of a sponge is also suitable for cleaning corrugated sheets or textile vehicle roofs. Instead of the bellows 50 , a telescopic pipe arrangement can also be used.

By replacing the polishing sponge 12 with a brush, shampooing of vehicle seats or vehicle carpets can also be carried out.

Provided that the suction ducts 46 are provided in FIG. 6, the area 12 '' of the polishing sponge 12 is preferably made of rigid, that is neither elastic nor absorbent material.

The suction hood 41 can optionally also be used to supply cooling air. Furthermore, the polish-water mixture could in principle also be supplied to the polishing surface 18 via the suction hood 41 .

Claims (34)

1. cleaning-polishing device with a hand-held device ( 19 ), which has a motor-driven, translationally or rotationally movable surface, in particular a rotating disc ( 11 ), on the front of which a flexible, non-scratchy, in particular absorbent material, preferably a sponge ( 12 ) can be fastened or fastened, and has liquid supply means ( 13 ) for the material ( 12 ), and with a liquid container ( 14 ) for receiving a fluid grinding polish or paste / water mixture ( 15 ), which is in line connection ( 16 ) with the liquid supply means ( 13 ) and from which the grinding polish-water mixture can be supplied, in particular centrally, to the polishing surface ( 18 ) of the material ( 12 ) by means of a pressure source ( 17 ). 2. Device according to claim 1, in which a hand-controllable on-off or continuously operating liquid flow control valve ( 20 ) is switched on in the liquid supply ( 13 ) provided on the hand-held device ( 19 ). 3. Device according to claim 1 or 2, wherein the liquid supply means comprise a pipe ( 13 ) guided centrally through the rotary disk ( 11 ). 4. The device according to claim 3, wherein the pipe ( 13 ) protrudes beyond the turntable ( 11 ) into the sponge ( 12 ). 5. The device according to claim 4, wherein the pipe ( 13 ) projects beyond the turntable ( 11 ) up to about 1/3 of the sponge thickness in the middle thereof. 6. Device according to one of the preceding claims, wherein the sponge is a hard sponge ( 12 ), which preferably consists of plastic. 7. Device according to one of the preceding claims, wherein the sponge ( 12 ) has a central through bore ( 21 ) into which the liquid supply means ( 13 ) open. 8. Device according to one of the preceding claims, wherein the sponge ( 12 ) is designed as a circular cylindrical body, the diameter of which essentially corresponds to that of the turntable ( 11 ). 9. Device according to one of claims 1 to 7, characterized in that the sponge ( 12 ) is formed as a conically expanding body from the turntable ( 11 ) to the polishing surface ( 18 ). 10. Device according to one of the preceding claims, wherein the container ( 14 ) via a hose ( 16 ) with the liquid supply means ( 13 ) or the valve ( 20 ) is connectable or connected. 11. The device according to any one of the preceding claims, wherein the container ( 14 ) contains as a pressure source an air pump ( 17 ) with which an air column ( 22 ) located above the grinding polish-water mixture ( 15 ) can be pressurized. 12. The apparatus of claim 11, wherein the pressure on Start of operation is approximately 2 atm. 13. Device according to one of the preceding claims, wherein the speed of rotation of the turntable ( 11 ) is 600 to 2000 rpm, preferably approximately 2000 rpm. 14. Device according to one of the preceding claims, at which is the grinding paste or polish mixed with water is free of wax or silicone. 15. Device according to one of the preceding claims, at the mixing ratio of grinding polish or Abrasive paste and water at least 10:90, preferably is approximately 25:75 and in extreme cases 30:70 to 40:60. 16. Device according to one of the preceding claims, in which a cleaning device ( 25 ) designed as an upward-pointing stationary brush ( 23 ) is provided for the sponge ( 12 ). 17. The apparatus of claim 16, wherein the brush ( 23 ), preferably centrally from below, a fluid, in particular water jet can be supplied. 18. Device according to one of the preceding claims, wherein the grinding polish water supply is on average 150 to 200 ml / min, provided that the speed of the turntable ( 11 ) is 2000 rpm. 19. Device according to one of the preceding claims, in which a suction hood ( 41 ) is arranged above the turntable ( 11 ) and the sponge ( 12 ). 20. Device according to one of claims 9 to 19, wherein the conically expanded sponge part ( 12 ') cut out of a cylindrical sponge and then glued together again by means of a waterproof adhesive ( 31 ) after drying to form an overall cylindrical structure ( 12 ). 21. The apparatus according to claim 20, wherein the conical boundary surface ( 31 ) on the polishing surface ( 18 ) ends and the water-tight layer is interrupted in an area above the polishing surface ( 18 ), so that during the polishing process liquid radially outwards there can pass through. 22. The apparatus of claim 21, the interface (31) is conically provided outwardly extending waterproof layer (42) through the polishing surface (18) of the polishing surface (18) in the radially outward from the intersection circle (44). 23. The apparatus of claim 19 and 22, wherein the suction hood ( 41 ) comprises a sponge ( 12 ) surrounding a fixed ring housing ( 43 ), the polishing surface ( 18 ) facing edge ( 43 ') approximately at the level of Puncture circle ( 45 ) of the outwardly extending waterproof layer ( 42 ) through the peripheral surface of the sponge ( 12 ). 24. The device according to any one of the preceding claims, wherein the conical interface ( 31 ) at the cylindrical circumference of the sponge ( 12 ) ends. 25. Device according to one of the preceding claims, in which in the sponge ( 12 ) and optionally the turntable ( 11 ) suction channels ( 46 ) are provided. Comprises 26. The apparatus of claim 19 and 24, wherein the suction hood (41) comprises a sponge (12) surrounding the bellows (50) existing on a non-marring of the coating material ring (51) on the surface to be polished ( 52 ) is supported. 27. A method for cleaning and polishing in particular painted surfaces by means of a translatory or rotating flexible, non-scratchy, in particular absorbent material, preferably a sponge ( 12 ), in particular with a cleaning-polishing device according to one of the preceding claims, in which the material , in particular sponge ( 12 ), a grinding paste or grinding polish-water mixture is preferably fed continuously or periodically during the polishing process. 28. The method according to claim 27, wherein the sponge ( 12 ) is cleaned by pressing onto a stationary brush ( 23 ). 29. The method according to claim 28, wherein the brush ( 23 ) is supplied with water during cleaning. 30. The method according to claim 28 or 29, wherein during the Also clean the grinding polish water supply is switched. 31. The method according to any one of claims 27 to 29, in which the grinding polish water supply at intervals of a few Seconds, e.g. B. 3 to 5 sec, each for times of is switched on for less than 1 sec. 32. The method according to claim 30 or 31, characterized net that the grinding water supply late switched on once after every 10 to 15 seconds becomes. 33. The method according to any one of claims 27 to 32, in which Paint cleaner and / or industrial dust remover Grinding polish-water mixture is added.   34. Sponge for a polishing device according to one of claims 1 to 26 and for performing the method according to one of claims 27 to 33, characterized in that it is substantially circular-cylindrical and has a central through bore ( 21 ).