Abrasive finishing elements, tools made from such elements, and

Details Abrasive finishing elements, tools made from such elements, and Abrasive finishing elements, tools made from such elements, and

1990-01-29

1992-10-20

Rachuba, M.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51331, B23F 1905

Patent

active

051559455

ABSTRACT:
A plastic strip or strap 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 strip or strap 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 strip or strap 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 strip 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 strip or strap 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 strips or straps straight, or bent to an S-shape or formed so that the edge of the strip or straps is in the form of a helix. Such strips 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 strip may be chamfered. A spot facing tool may be formed by tightly coiling a length of strip or strap and then driving the coiled strip into liquid adhesive at the bottom of a holder. The strips or straps may be folded around wires or cores and clinched with a channel to form a strip which may then be assembled to form disc or cylindrical strip tools. In such construction the strip or strap may be scored or serrated transversely of its length.

REFERENCES:
patent: 2049324 (1936-07-01), Schneider
patent: 2214515 (1940-09-01), Vanderveer
patent: 2421647 (1947-06-01), Peterson
patent: 3312993 (1967-04-01), Nelson
patent: 4154026 (1979-05-01), Dalthe
patent: 4285171 (1981-08-01), Block et al.
patent: 4305234 (1981-12-01), Pichelman
patent: 4364746 (1982-12-01), Bitzer et al.
patent: 4625466 (1986-12-01), Sargusa
patent: 4668248 (1987-05-01), Deffelbach et al.

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