Abstract: A centering jig assembly for centering guide holes for a drill provides an improved adjustment feature, which avoids reliance on fasteners to fix the position of the screw device with respect to the clamp jaws. The jig assembly includes a first holding element having a first threaded bore extending therethrough and a first bearing face bearing against a first engagement surface of a work piece and a second holding plate member having a second bearing surface and a second bore extending therethrough for alignment with the first bore, the second bearing surface bearing against a second engagement surface of the work piece. A center axis of the first bore and a center axis of the second bore are collinear defining an axis of travel. The first and second plates are adapted to translate generally parallel with respect to each other along the axis of travel.

Abstract: An electrical contact assembly between two conducting elements disposed face to face comprises wedge-shaped graphite inserts (26) located in similarly shaped grooves (22) in one of the faces (20). One end of each insert (26) lies short of the end of the groove (22) and the other end is proud of the face (20), so as to make good electrical contact with the other face (34) when the two faces (20,34) are pressed together. The invention achieves good electrical contact and conduction of current in applications where this has proved difficult in the past. Particular examples are clamps for graphite electrodes and connections to steel billets used as electrodes in an electro slag refining process.

Abstract: A cooling means for a furnace, particularly a blast furnace, is mounted to the furnace by means of a bellows, the rear end of which is attached to a collar surrounding one or more of the conduits for cooling water and the front end of which is adapted for attachment to the furnace shell or a member rigid therewith. In this way the cooling element is firmly and sealingly mounted in the furnace shell, the bellows allowing movement of the element with respect to the shell caused by settling of refractory material in which the cooling element is located.

Abstract: A tuyere is disclosed with a partition blocking the direct path between the inlet and outlet orifices (16,18) in the main cooling chamber (14). Guide members (30,32) extend from the far side (from the partition) of the orifices (16,18) towards but not reaching the nose-end wall of the cooling chamber (14). Therefore whichever orifice (16,18) is used as the inlet for cooling fluid, a fast moving stream is ensured at the nose end of the chamber (14) near the partition. This assists the cooling of the tuyere in this area, which otherwise tends to form a marked hotspot, especially when the inlet and outlet orifices (16,18) are close together.