Abstract: A plant for conductive electrical heating of elongated electrically conductive objects, e.g. steel blanks for further treatment in a roll mill. Said plant comprises a combination of the following features:at least two blanks (1) are provided in parallel and spaced from each other, and are connected with at least one current supply (2) by the aid of transmission contacts (3, 4), which are provided so as to be urged towards the ends (1a, 1b) of blanks (1). Blanks (1) with associated transmission contacts (3, 4) are provided in a heat insulated chamber (5), in which blank (1) and chamber (5) together constitute an electrical furnace, in which blanks (1) constitute the heating elements of the furnace. A conveyor or manipulator (7) is provided for insertion, and removal, respectively of blanks (1) in transmission contacts (3, 4) in chamber (5) through an opening (9) in the surrounding chamber wall in any order chosen.

Abstract: A rotary scraping or abrading tool in which a rotatable disc has a multiple of guiding bores through which scraping elements are axially arranged. The scraping elements have outer active ends extending beyond the face of the disc facing the workpiece to be treated. Inner ends of the scraping elements bear against a disc of elastic material. The scraping elements are provided with axial play within the bores which are arranged as coacting sets of holes in at least two adjacent parallel discs. The scraping elements are in the form of circular cylindrical tubular studs with a scraping end cross-cut and with an inner end thereof having a head. The cross section of the head exceeds the cross section of the remainder of the stud. The bores, moreover, have an axis at an acute angle relative to the direction of rotation of the discs.