Abrading – Frame or mount – Portable abrader
Patent
1997-12-09
1999-08-03
Eley, Timothy V.
Abrading
Frame or mount
Portable abrader
451356, 451357, 451359, 451504, B24B 2302, B24B 2304, B24B 2306
Patent
active
059317272
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a portable grinder and a tool for the same.
Portable grinding tools are already known, wherein a flexible cushion is disposed between the part performing the grinding motion, i.e. the grinding wheel, and the surface grinding device, in particular the abrasive disk. The flexible cushion causes pressure distribution over a large surface between the portable grinder and the workpiece, so that an even material removal from the surface of the workpiece is possible.
The previously known cushions are essentially plane bodies, which, although they perform a satisfactory job when resting on a level workpiece surface, are less suitable for working contoured surfaces, because they make line or point contact and thus destroy the contoured surfaces during the grinding process.
The use of profiled cushions with the negative profile of the workpiece surface is not known.
Particularly the grinding of elongated outer or inner cylindrical surfaces, for example on the body of boats, aircraft, banister rails or the like is very time-consuming due to the lack of proper grinding tools, wherein the danger arises, that because of the line contact an uneven surface removal takes place and the surface to be worked becomes deformed.
SUMMARY OF THE INVENTION
In contrast to this, the portable grinder or respectively the tool in accordance with the invention have the advantage that there is a quickly adaptable grinding tool, fitting the workpiece profile, making it possible to work even relatively complicated surface profiles in an extremely time saving and exact manner, as for example working turned banister rails or respectively elongated, cylindrical bodies, such as bodies of boats or respectively aircraft parts.
This is achieved in that the flexible cushion forms an imprint of the workpiece surface to be worked in that, after the grinding tool with the cushion has been set down in the manner of a die, the air is pumped out of the cushion, which is filled with soft or hard, coarse or fine-grain granules and is air-tight on its outside. The cushion now retains the imprint of the workpiece surface. This cushion can be fitted onto portable grinders with grinding wheels that move back and forth or that rotate.
If a workpiece with another profile form is to be worked, the grinding wheel is again placed onto the other workpiece, wherein the vacuum is removed by opening a valve in the grinding cushion. In this way the granular parts can rearrange themselves and can again form an imprint of a workpiece surface.
It is of particular advantage, if the cushion envelope is of a flexible, balloon-like composition, so that it is inflatable prior to filling it with granules and does not form any folds during the subsequent air release, when the cushion volume is reduced.
In addition it is advantageous, that the granular-like filler is made of a porous, elastic material, so that the cushion can yield elastically when placed on a workpiece and a gentle pressure transfer can take place or respectively omitting one that is too hard.
Furthermore it is advantageous, if the flexible cushion is outfitted with a retractable valve thus preventing interference with the operation of the grinding tool and if a vacuum pump is non-detachably connected to the portable grinder.
The cushion, from which the air can be released and which is filled with flexible granules, has the advantage that it can be used with rotating grinding tools as well as with those that are operating on back and forth movement, or as a padding with portable grinders or as a cover for the drive or guide pulley of portable grinders, so that any arbitrarily contoured workpiece surfaces can be worked true to measurement over large surfaces by means of all known devices, which were previously only usable for level workpiece surfaces, wherein the grinding cushion firmness can be varied by evacuation to a greater or lesser degree. In this case the base as well as the end faces of the cushion can be arbitrarily contoured and utilized for grind
REFERENCES:
patent: 4399578 (1983-08-01), Bordeaux
patent: 4510718 (1985-04-01), Eichenlaub
patent: 4831789 (1989-05-01), Herbin et al.
patent: 5672096 (1997-09-01), Amarosa et al.
Eley Timothy V.
Robert & Bosch GmbH
Striker Michael J.
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