Electric brush

Stock material or miscellaneous articles – All metal or with adjacent metals – Having magnetic properties – or preformed fiber orientation...


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310248, 310252, 428161, 428652, 428653, 428656, 428661, 428671, 428673, 428674, 428675, 428678, 428670, 428607, H01R 3900




A multifiber electrical brush formed of an electrically conductive matrix material having plural electrically conducting fiber wires embedded therein and extending therefrom, wherein the fiber wires have a diameter varying from 1 to 120.mu.m, a length on the order of 100 times greater than the diameter thereof, and a packing density between 1-25%. Suitable materials for the fiber wires are platinum, gold, silver, copper, palladium, or niobium which may be embedded in a copper, silver, or other suitable matrix material, or copper embedded in an aluminum matrix. The fiber wires may be provided with a coating of a suitable barrier material on the lateral surfaces thereof as may be required to protect the fiber wires from etching during removal of the matrix material, or to prevent and/or retard interdiffusion between the matrix material and the fiber wire material during annealing or hot-forming of brush stock, and/or to impart improved electrical performance to the resultant electrical brush. The electrical brush is fabricated typically by drawing, cutting, bundling and redrawing metal fiber wires, with or without a coating or casing of a barrier material, packed in a tube of matrix material, whereupon after shaping of the multi-filamentary ends to the shape of an object to which the brush is to make contact, the matrix is etched away to a predetermined length, preferably under high centrifugal forces in a centrifuge and/or with the application of ultrasound.

patent: 3254189 (1966-05-01), Evanicsko, Jr. et al.
patent: 3357824 (1967-12-01), Saarivinta
patent: 3733573 (1973-05-01), Dieterich
patent: 3821024 (1974-06-01), Wilkin et al.
patent: 3828417 (1974-08-01), Divecha
patent: 3840350 (1974-10-01), Tucker, Jr.
patent: 4226917 (1980-10-01), Tsuruoka, Jr.
patent: 4277708 (1981-07-01), McNab et al.
Adkins, C. M. et al., Electrical Contacts ILL Techn., Chicago, pp. 1-14, (1979).
Weast, R. C., Ed; Handbook Chemistry and Physics CRC Co., pp. B87, 134, 150, (1970).


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