Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1986-05-12
1987-08-25
Olszewski, Robert P.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51392, 15233, B24D 1504
Patent
active
046883568
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a hand-operated abrasive or polishing tool having an on-stretched, endless abrasive or polishing belt.
Manual grinding and polishing tools consist of a body on which a generally foliar abrasive means, i.e., an abrasive cloth or paper, is stretched. They are widely used in the form of files or grinding blocks, the grinding block being able to consist of rubber or cork and other resilient materials. The abrasive belt holders that are in the form of a file have a flexible, wedge-shaped backing for the belt, and the abrasive or polishing belt is held by a clamp by means of a tightening screw. In all these tools it is a disadvantage that only a small portion of the abrasive material can be utilized, because it is not possible to utilize the full stroke of the abrasive file, when, for example, it is necessary to work in a hard-to-reach location. This leads to a very high consumption of abrasive material, because only fractions of the fixed lengths, which are necessary in any case, can be used and the rest has to be discarded unused.
Furthermore, in the known tools the disadvantage exists that, if the belt material has been overstretched by the work, retightening is necessary, because otherwise the belt material can catch and tear. Such retightening is difficult and time-consuming in virtually all such tools, and in many cases it can be accomplished only to a limited extent.
Other disadvantages of the known tools lie in their shape, i.e., either only one convex surface or only one planar surface is available for the grinding or polishing operation.
It has therefore been proposed in U.S. Pat. No. 2,414,036 to provide as an grinding and polishing tool a grinding block with an endless abrasive belt, this block having acute and obtuse angles around which the endless belt is passed, while a resilient pad of felt, rubber or foam rubber can be disposed between the endless belt and the block. The tightening of the abrasive belt around the grinding block can be performed by wedge elements, since the block itself is divided. It is also possible, however, to dispose intermeshing tooth elements in the interior of the grinding block, in the form of a rack, and thus to make these tooth elements snap into one another by drawing the block apart.
This proposal, which goes back to the year 1945, has been unable to succeed, because the construction of the grinding block with its tightening means, i.e., the wedges or racks, was not optimally effective. As stated above, abrasive media, i.e., grinding belts and sandpapers, elongate on a support and catch, unless they are immediately tightened. This is not possible in the grinding block of U.S. Pat. No. 2,414,036, and instead, if the tension applied by the belt to the block relaxes, the tightening means loosens and the belt wrinkles, not only on account of its own elongation due to the work it has been doing, but also because, when the tension relaxes, the tightening means itself fails. In the case of tightening by wedges, the wedges drop out of the grinding block, and in the case of tightening by racks, the racks snap apart, i.e., the grinding block itself is no longer stable and automatically falls apart.
The invention is thus addressed to the problem of creating a tool which permits complete utilization of the grinding or polishing belt, does not require complex tightening of the grinding or polishing belt, automatically keeps the grinding or polishing belt always tight, and has at least one planar and a plurality of convex working surfaces with various radiuses.
This problem is solved by a hand-operated abrasive or polishing tool having an endless grinding or polishing belt stretched on it, which has the distinctive feature that the tool consists of a substantially flat bar-shaped profile having at least one limb, in which at least one limb is disposed resiliently with respect to the profile or another limb, and the profile and all limbs are surrounded under tension by an endless abrasive or polishing belt.
On the basis of the r
REFERENCES:
patent: 2547837 (1951-04-01), Robbins
patent: 3699729 (1972-10-01), Garvey et al.
patent: 4242843 (1981-01-01), Phillips
patent: 4525959 (1985-07-01), Ziebarth et al.
Feldmuehle Aktiengesellschaft
Olszewski Robert P.
LandOfFree
Hand-operated grinding or polishing tool does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hand-operated grinding or polishing tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hand-operated grinding or polishing tool will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1916179