DE202004008100U1 - Electric-powered industrial injection polishing tool has thumb lever controlled discharge regulation valve for polishing agent - Google Patents

Abstract

A hand-held industrial polishing tool has an electric motor-driven rotating polishing head which incorporates a discharge tube and outlet for a liquid or semi-liquid polishing agent. The injected flow of polishing agent is regulated by a thumb-operated on/off valve (5) mounted on the handle (2). The tool with thumb-controlled valve is a modification of the prior art wet-polishing tool.

Description

It is known that polishing old car paints is measured by the degree to which it works (after washing and before the paint preservation) both firmly adhering dirt remove, as well as paint oxidation and scratches (if they not too close to the primer).

It is also known to do this polishing using electrical called "polishers" or "angle polishers" handsets perform. The work is interrupted regularly, for fresh polishing paste on the polishing sponges of the switched off To apply to polishers.

Desirable would be for this Work an electric handheld device to disposal to have a (polishing) liquid centrally through its turntable the polishing sponge and the work surface like an injection (if necessary, even every second, at the push of a thumb and without the actual polishing work to interrupt) becomes.

Although promises U.S. Patent 1971,790 ("PORTABLE POWER TOOL") the central supply of cooling water to a grinding wheel made of abrasive material, and U.S. Patent No. 17 06 402 ("SURFACE FINISHING DEVICE") the central supply of a mixture of a liquid and an abrasive material to a rotating disc made of comparatively soft rubber. However, only a mechanism regulating the amount of a continuous liquid inflow is provided as a valve, for example a knurled screw.

The U.S. Patent 30 99 905 ("PORTABLE TOOL") meets at least theoretically the following minimum requirement essential for the efficient polishing of old paints: namely that the supply of the polishing liquid should be periodic, "at the push of a thumb".

In contrast to the "PORTABLE TOOL", the present invention according to protection claim 1 does not use a plate or slide valve based on rotation in the gear head itself (due to its construction, this corresponds more to a shut-off valve with a relatively long activation phase: the full cross section for the passage of liquid is only achieved when the valve lever is in the end position, which means that the gear head and the polishing sponge () generate an optimal injection pressure of the polishing liquid ( 21 ) prevents), but a so-called turret valve, which is based on the one hand on (faster activated) stroke, and on the other hand is relatively easy to move due to the approx. 8 cm long lever arm of the controller. This valve, which ensures the ability to inject, is mounted in the longitudinal direction on top of your housing, not in the gear head, due to its relative space requirements and for ergonomic reasons.

Because the "PORTABLE TOOL" has the supply regulating valve (on the side) in the gear head of the machine, it can only be operated there by the thumb of the hand that also guides the machine at the front. Especially when intensively polishing larger surfaces (otherwise than with partial polishing), the machine is not most effectively guided using a handle on the side, as in the U.S. Patent 30 99 905 "PORTABLE TOOL" specified, but via a handle (see 1 , ( 24 ) of this invention). In combination with the handle, this handle allows the tool to be guided along its longitudinal axis with both hands, with optimal pressure on the work surface, without torsion. However, the use of a bow handle means that the leading hand in front of the gear head (see 1 , ( 28 ) in this invention) is positioned from where the valve for the liquid addition should no longer be accessible without interrupting the work with the tool.

The present invention enables Eliminating the theoretically anticipated shortcomings of said inventions (Machines like the "PORTABLE TOOL " one during of the current operation periodically manually operated on / off valve not available on the market in this form, and it has so far been possible do not determine whether one has ever gone into production) in terms of use as an "injection polisher", and at the same time the costly redesign of such is avoidable because here on a proven machine on the market of a related one Product is put on.

So it is predominantly used here parts on the market are commercially available parts on the market Wet grinder (also called wet stone grinder) to meet the requirements practice-fulfilling Injection polisher modified, which is especially for the intensive Polish of old, weathered (car) paints is used, and its Use the following advantages over usual (Dry) polishers promise:

• - productivity increase in the polishing performance due to periodic, injection-like (Polishing) liquid supply for Polishing disc (or sponge) "on the thumb pressure", without removing the Machine; the manual application of polishing agents is eliminated.
• - more ergonomic and more economical Work: Because the polish used in the injection polisher diluted with water is polished, so to speak, wet. Advantages: A damp polishing sponge runs more smoothly caused by cooling effects less damage (less "polishing", less "burning" of plastic parts), and needed less drive power. Compared to dry polishers therefore for an injection polisher a much weaker - and therefore also lighter - Sufficient electric motor.

The starting point for the invention is an angle grinder which, in the commercially available variation "wet grinder" (main area of application: processing natural stones), already has a central liquid supply (see ( 1 ) in 1 ) is provided inside the turntable.

Furthermore, the wet grinder to be modified has conveniently via the following Features:

• 1. electrically operated
• 2. with handle ( 2 )
• 3. with on / off switch ( 3 ) integrated in the handle of the handle
• 4. with a fixed speed of 2000 rpm, or more variable Speed with a maximum of 2400 rpm.
• 5. Power consumption: 500-1000 watt
• 6. Either equipped with a isolating transformer, or with a PRCD personal protection switch ( 4 ) to protect leakage current, according to DIN 100.

This source machine is through following conversions and additions to an injection polisher (Main area of application: paint cleaning and scratch polishing in particular for old Car paints) modified:

• 1. The valve regulating the liquid supply at the wet grinder is removed together with the hose holder, and by means of a manually controllable on-off valve (“turret valve”), which is essentially made of plastic, (see. 1 , ( 5 )) with approx. 8 cm long lever arm ( 6 ) including the appropriate supply line ( 7 ) for a fabric hose ( 8th ) with an inner diameter of 5 mm and a wall thickness of 2 mm, and additionally with a suitable cable tie ( 9 ) fixed to the housing.
• 2. The (preferably by pressing the lever ( 6 ) to be actuated towards the housing of the injection polisher), the hand-controlled on-off valve is attached in a position in which it can be removed from the handle of the handle while working ( 2 ) of the injection polisher can be conveniently operated with your thumb at any time (in practice approx. every 3–10 seconds) without having to take your hand off the handle of the handle: around 2 cm above the motor housing of the injection polisher Stick handle protruding. This arrangement eliminates the following restrictions, which, for example, when operating the "PORTABLE TOOL" US 3,099,905 in addition to those mentioned above, the operation of the valve during use would now be there (without stopping) for left-handed or Right-handers possible (depending on the design); in addition, continuous use appears doubtful due to the expected overheating of an operating element installed in the gearbox of the machine; moreover, when using the on-off valve made of plastic, which concerns the present invention according to protection claim 1, a not inconsiderable weight saving should come about, since on the one hand the valve provided for the "PORTABLE TOOL" would necessarily have to be made of metal, and on the other hand the gear head for the constructional accommodation of this valve would be dimensioned much larger than in the arrangement proposed here.
• 3. Instead of, as usual with a wet grinder, the liquid line is not a commercially available water hose with a standard coupling, but a soft PVC hose ( 8th ) with textile insert, preferably transparent (hereinafter referred to as "fabric hose", then referred to in the protection claims as "liquid line"). This is from the supply line ( 7 ) of the newly inserted on-off valve, which is curved in an S-shape, and behind the end of the handle ( 2 ) of the injection polisher (depending on the "handedness" of the user on the left or right, definitely on the side) reversible with a clamp ( 10 ) at an angle described in detail under 5. ( 11 ) fixes that there is a half-loop of constant design, which enables the user of the tool to grip the handle of the machine safely at all times, even if the angle of the hose package ( 12 ) (= Power cable ( 13 ) + Fabric hose ( 8th ) in the shrink tube ( 14 ), see below, under 4.) changes to the injection polisher.
• 4. For the power supply, the injection polisher is preferably connected to a power cable approx. 12.5 m long from the PRCD personal protection switch ( 13 ) (three-wire, 3 × 1.5 mm²) converted. This and the approximately equally long fabric hose ( 8th ) for the fluid supply are in a shrink tube to avoid a doubling of the risk of stumbling and for better handling, as well as for the use of conductors ( 14 ) (preferably with an inner diameter of 21.1 mm before shrinking), which z. B. compared to a cohesion with so-called "suitable clips" (s. U.S. Patent No. 17 06 402 , "SURFACE FINISHING DEVICE") offers considerable advantages in terms of safety (less "getting caught") and cleaning.
• 5. In addition to the standard strain relief for the power cable, the hose package described under 3 and 4 ( 12 ) a strain relief of the fabric hose is necessary, because in addition to the weight of the (here much longer and correspondingly heavier) power cable there are also: a) the weight of the fabric hose, b) that of the heat shrink tubing that includes both, and c) the weight of the polishing liquid transported in the fabric hose. The reversible fixation of the Ge described under 3 woven hose ( 8th ) by a clamp ( 10 ) behind your end of the handle ( 2 ) at an angle ( 11 ) fulfills the purpose in a correspondingly stable design, breaks in the power cable ( 13 ) to avoid. At the angle ( 11 ) ( 2 ) is a component to be made to measure, preferably made of aluminum, with a) a bore ( 15 ) to carry out a standard cable entry in one leg, and b) two threaded holes ( 16 ) in the second leg for receiving the screws from the clamp ( 10 ). This angle ( 11 ) between the rear outlet opening of the handle and a commercially available waterproof cable entry with kink protection ( 15 ) that when screwing said cable entry with the handle of the handle by tightening a hexagon nut ( 16 ) is sufficiently rigidly fixed, but is also reversible, in the sense that only the hexagon nut ( 16 ) the cable entry has to be loosened with a quarter turn in order to convert the machine from right-handed to left-handed operation (and back), but not the fabric hose ( 8th ) on the angle ( 11 ) fixing clamp ( 10 ) because only the angle ( 11 ) must be turned through 180 °.
• 6. For the (also remote-controlled) supply of polishing liquid from a storage container to the polishing disc or polishing pad, it has become known, for example, to generate compressed air at the operating station of the machine, which is guided into the storage container by flexible lines (see patent specification German Reich No. 509302 : "REMOTE-CONTROLLED POLISHING AGENT SUPPLY FOR BALLING POLISHING MACHINES WITH LIQUID STORAGE CONTAINERS"). 17 ) provided. This pressure vessel is, for example, a pressure sprayer that is quite commercially available, but modified as follows: The lance belonging to such equipment, including the supply line and spray head, is dismantled according to the invention and against the fabric hose leading to the injection polisher ( 8th ) replaced, ie on the hose holder ( 7 ) connected in such a way that the pressure (1-2 bar) provided as described above is constantly applied to the on-off turret valve mounted on the housing of the injection polisher, so that (also due to the long lever arm ( 6 ) of the turret valve relatively easy) actuating it enables an extremely ergonomic and (above all) delay-free (polishing) liquid injection into the polishing sponge up to the material surface. In the best case, the pressure vessel ( 17 ) on the one hand with a vertical riser ( 18 ) provided on the top ( 19 ) the pressure sprayer emerges in order to a) reduce the risk of the pressure sprayer becoming blocked due to polishing agent (lumps) settling on the floor, and b) enabling space-saving storage in the (standardized) storage container; for the same reason (b) the diameter of the pressure sprayer should not exceed 21.5 cm, so that two pressure sprayers can be stored next to each other in a standard storage box. The bottom should not be divided into "chambers", but should be largely flat or trough-shaped. Furthermore, the filling volume of the pressure vessel should be between three and five liters in order to be able to shake the polishing liquid gently and without using an agitator Fabric hose ( 8th ) at the point ( 19 ), the commercial hose should only be switched on after approx. 50 cm with the power cable ( 13 ) in the shrink tube ( 14 ) open so that, under normal use, the weight of the complete hose package ( 12 ) can exert a corresponding tension on the fabric hose.
• 7. As a polishing agent ( 20 ) We particularly recommend using a commercially available paint cleaner diluted with water in a ratio of approx. 1: 2 with as little wax content as possible. The latter prevents waxes from accumulating on the polishing disc and adhering to the paint when heated.
• 8. The commercially available medium-hard Velcro polishing sponge to be used on the company side ( 21 ) with the dimensions 160 mm diameter and 40 mm thickness (like the polishing plate ( 22 )) with an 8-10mm central hole ( 23 ) through which the polishing liquid gets into the sponge and onto the surface to be polished.

Claims (6)

Injection polisher, characterized in that in a commercially available electrical hand-held device known as a wet grinder, the standard (and continuous flow-dependent) liquid line there, including the liquid flow control valve, is activated by a thumb from the handle of the handle ( 2 ) of the electrical device holding hand from (now permitting periodic operation) operable on-off valve ( 5 ) is replaced, and that a) one with a central bore ( 23 ) provided polishing plate ( 22 ) and a similar polishing disc ( 21 ), and b) a polishing liquid diluted with water ( 20 ) from a pressure vessel ( 17 ) are used. Injection polisher according to protection claim 1, characterized in that the liquid line tung ( 8th ) on or behind the handle of the handle ( 2 ) is fixed so that over the handle of the handle ( 2 ) results in a half loop that is approximately 3 cm to 8 cm high in its formation. Injection polisher according to protection claims 1 and 2, characterized in that the attachment of the liquid line ( 8th ) behind the handle ( 2 ) by a clamp ( 10 ) on an angle ( 11 ) he follows. Injection polisher according to protection claim 1, characterized in that the liquid line ( 8th ) at the end of the handle ( 2 ) or behind it so that there is an additional strain relief for the electrical cable supplying the injection polisher ( 13 ) results. Injection polisher according to protection claim 1, characterized in that the hose package ( 12 ) consisting of the liquid line ( 8th ) and the power cable ( 13 ) in a shrink tube. Injection polisher according to protection claim 1, characterized in that the pressure container ( 17 ) above the polishing liquid ( 20 ) generated pressure of 1–2 bar via the liquid line ( 8th ) is permanently attached to the on-off valve of the injection polisher.