Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1992-01-22
1993-02-23
Rachuba, M.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51331, 51394, B24D 900
Patent
active
051879042
ABSTRACT:
A plastic strap or tape having granular abrasive embedded homogeneously throughout is cut, shaped and formed into a variety of abrasive finishing tools. The plastic working element is preferably rather stiff 6/12 nylon and contains about 30 to 45% by weight of abrasive material. The strap or tape is formed by extrusion of such non-elastomeric plastic through a ceramic die opening and as extruded has an indefinite length in the machine direction, a controlled uniform thickness, and a width which is approximately 5 to 50 times or more the thickness. A preferred width to thickness ratio is about 30:1, or about 1 mm to 3 cm. The strap or tape may be cut to the desired length and partially embossed, serrated or scored either lengthwise or transversely to provide fracture or flex lines. The spacing of the serrations or score lines controls the degree of flexibility or aggressiveness of the tool working face. The use of a fairly wide strap with serrations or scores not only provides an improved tool but greatly facilitates the construction of the tool. The invention includes a variety of tools formed from the abrasive strap or tape and these include radial or flap wheels, both serrated and non-serrated, internal tools using a rotatable stem, also both serrated and non-serrated. Such tools may employ the straps or tapes straight, or bent to an S-shape or formed so that the edge of the strap or straps is in the form of a helix. Such straps may be secured to the stem at a notch to provide both a side and bottom working edge for internal wall work. Also the edges of the strap may be chamfered. A spot facing tool may be formed by tightly coiling a length of strap or tape and then driving the coiled strap into liquid adhesive at the bottom of a holder. The straps or tapes may be folded around wires or cores and clinched with a channel to form strip which may then be assembled to form disc or cylindrical strip tools. In such construction the strap or tape may be scored or serrated transversely of its length.
REFERENCES:
patent: 2049324 (1936-07-01), Schneider
patent: 2370490 (1945-02-01), Rice
patent: 2826776 (1958-03-01), Peterson
patent: 4281171 (1981-08-01), Block et al.
patent: 4646479 (1987-03-01), Walker et al.
patent: 4882879 (1989-11-01), Warner et al.
Scheider Alfred F.
Tyler James B.
Warner R. Brown
Jason Inc.
Rachuba M.
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