Abstract: A device for an oil burner has a ceramic tube (1) inside which a shorter tube (61) is arranged, so that there is a slot between the tubes. The device stands freely in the combustion room of the boiler, and it is coaxial with an oil burner (66) that is mounted in the boiler room wall. Combustion fumes mixed with fresh air from the fan of the oil burner is sucked into the slot that ends inside the ceramic tube. The oil burner flame in the inner tube (61) heats this inner tube that in turn heats the air that is sucked through the slot and is secondary combustion air. The slot has screw-formed ridges that impart a heavy rotation to the secondary air; a rotation that is counter to the rotation of the primary air of the burner. Since the secondary air is hot and rotates heavily, the final combustion will be very efficient.

Abstract: A cutting insert for chip forming machining of metal workpieces, especially for milling, has an upper face, a lower face and edge faces intersecting the upper face to form cutting edges. A chip upsetting face extends inwardly from the cutting edge and a concavely curved chip face extends inwardly from the chip upsetting face to form a transition edge therewith. The upper face is provided with a number of depressions which are spaced apart along the transition edge. The depressions intersect the transition edge and extend inwardly therefrom. The depression extend non-perpendicularly relative to the cutting edge to form an acute angle with a line perpendicular to the cutting edge. The acute angle is in the range of 5 to 45 degrees. During a cutting action in the depressions cause runners to be formed on the chip bottom, and the runners tend to climb up the sides of the depressions.

Abstract: A cutting insert simultaneously performs a plurality of operations such as roughing and finishing, or roughing and polishing. A roughing/finishing insert has a main cutting edge and a secondary cutting edge, both edges extending laterally relative to a direction of feed of the insert. The secondary cutting edge is disposed rearwardly of the main cutting edge and extends farther laterally outwardly than the main cutting edge by a distance which is substantially less than the lateral extent of the main cutting edge.

Abstract: A cutting insert (20) for chip forming machining has at least one cutting edge (21) created by the transition between an upper face (22) and a side face (23) of the cutting insert (20), said upper face (20) being a rake face and the side face (23) being a flank. The rake face comprises a chip upsetting face arranged adjacent to the cutting edge (21) and a curved chip breaking face (25) arranged adjacent to the chip upsetting face (24). A number of mutually separated along and inside of the cutting edge (21) located depressions (27) are arranged to bridge a border line (26) between the chip upsetting face (24) and the chip breaking face (25).

Abstract: A chip cutting tool comprising a tool body and a resiliently yielding element for clamping a cutting insert to the tool body. The cutting insert is adapted to be clamped by making use of solely a portion of the available yielding movement and adapted to be loosened by further resilient yielding movement of the element at the same time as the cutting insert is clamped butt on butt to the tool body.

Abstract: A method and apparatus for providing a surface coating of a metal or metal alloy on the wall of an elongate cavity in a workpiece by means of electrolytic plating, the workpiece being used as cathode. An electrolyte containing ions of the metal intended for the coating is brought into movement inside the cavity with the aid of a conveyor, which consists of a resilient and electrically insulating material such as a perforated, net-like or fibrous strip, and which is wound helically round the anode. The strip is fringed or slit on the edge facing towards the cavity wall to form outstanding resilient fingers which are in contact with the cavity wall.

Abstract: A method and apparatus for providing a surface coating of a metal or metal alloy on the wall of an elongate cavity in a workpiece by means of electrolytic plating, the workpiece being used as cathode. An electrolyte containing ions of the metal intended for the coating is brought into movement inside the cavity with the aid of a conveyor, which consists of a resilient and electrically insulating material such as perforated, net-like or fibrous strip, and which is wound helically around the anode. The strip is fringed or slit on the edge facing towards the cavity wall to form outstanding resilient fingers which are in contact with the cavity wall.

Abstract: The composite roller of the invention comprises a ring of near-resistant material encircling a holding member which latter has an inner portion and two radial flanges between which said ring is axially fixed. Said flanges have grooves at those portions which abut lateral surfaces of said ring. A continuously U-shaped intermediate space is provided axially and radially between ring and holding member.

Abstract: A device for utilizing energy stored in wave motion. A buoyant body on the water surface is anchored so as to permit free, unrestricted vertical movement when acted upon by a heaving wave. An energy collecting member connected to the buoyant body and including propeller blades is located at a depth where the water is not subjected to the vertical wave motion.