Abstract: A pneumatic hammer-tool designed for driving fastener bolts, in which a piston within a cylinder is charged with compressed air and progressively accelerated in order to drive a fastener bolt, is constructed in such a way that the wall of the cylinder is interrupted by windows on the retracted side of the piston. The axial extension of the windows is less than that of the piston. The cylinder is surrounded by a housing which is connected to a compressed air supply. As the piston is advanced forwardly from its rest position it opens the windows in the cylinder in such a way that compressed air can flow into the cylinder from the surrounding housing and charge and accelerate the piston. In this way much greater kinetic energy is produced. Unintentional actuation of the hammer tool is safely and reliably prevented by a mechanical and a pneumatic safety device.

Abstract: A one-piece open-ended water-cooled continuous casting mold and a method of making it to improve the service life of such mold made up from galvanically precipitated layers of which an inner layer consists of a wear-resistant metal such as nickel and an exterior layer is made particularly from copper. After the mold has been manufactured and while still on the core it may be further improved by application of external pressure.

Abstract: The invention relates to a method for repairing slide plates of metallurgical containers. These types of slide plates consist of refractory material and have a passage opening for the discharge of the liquid metal, which is usually steel. Owing to corrosion and radial cracks, which orginate at the passage opening, these slide plates 5 become worn after a lengthy operating time. In order to be able to further use them to a large extent, the invention provides a bore, in the area of the opening, extending as far as the edge of the rim 6 of the slide plate, while the remaining refractory material is retained. Into this bore there is poured a refractory casting mass, the grain structure of which has a particular relation to the pore size of the retained refractory material. The essential fact is that the solid bodies of the refractory casting mass are predominantly smaller than the open pores, cut by means of the boring process, of the retained refractory material and can penetrate into the pores.

Abstract: The invention relates to the surface stripping treatment of objects consisting of iron with a high carbon content, the surface stripping treatment being carried out by means of a flame which is directed at the surface and which is formed by the combustion of a heating gas with oxygen, there being also provided in the impingement zone of the flame a gas which flows at a slower velocity than the heating gas and the oxygen and which also reacts endothermically with at least one component of the flame gases.

Abstract: A method of depositing a metal coating on the wall of a chill mould for use in continuous casting wherein the mould is placed in a deposition bath such that an internal wall thereof to be coated is oriented generally upright, the deposition bath being composed of a solution containing at least one nickel salt and a suspension of particles of a hard metal having a critical deposition temperature range defined by upper and lower limit temperatures. A metallic layer containing nickel is deposited on the mould wall either by electrolytic or by electroless techniques, and during such deposition the mould wall is maintained at a temperature in the vicinity of one of the upper and lower limit temperatures while the solution is maintained at a temperature in the vicinity of the other of the limit temperatures, the temperature difference between the mould wall and the solution being within the aforesaid critical deposition temperature range.

Abstract: A method of repairing an ingot mould for a steelworks which forms cracks, the method comprising applying a patch plate at both sides of the crack, a series of patch plates being provided in succession in the direction of the length of the crack, reinforcement strips curved to match the curvature of the mould wall being provided on the patch plates and being adjusted to positions transversely of the length of the crack and then fixed on the plates.

Abstract: A bending apparatus for bending individual sheet and strip blanks and having a bending punch curved to a radius less than the desired bending radius. Tip-supports are arranged at either side of the punch and are pivotable in the bending plane. Each support has a supporting pad for holding the blank and the pivotal articulations of the supports are arranged beneath the pads and spaced horizontally from the edges of the pads facing the punch.

Abstract: A holding device for a manually portable drilling machine includes a detachable tension element which is attached at two mutually opposite points to a carrier member for the portable drilling machine, the tension element being sufficiently long to encircle at least the horizontal circumference of the object to be drilled at the vertical level of the hole to be drilled. In addition the device includes a resilient bracing means provided between the portable drilling machine and the tension element when the drilling machine is located at a drilling site and the tension element is secured to the carrier so as to be in tension around the object to be drilled.

Abstract: A method of securing a patch of resilient material to a surface, in which method the patch is applied to the surface so as to form a curved clearance between itself and the surface, pressure is applied to press the central region of the patch against the surface, and the edges of the patch are subsequently secured to the surface. Also provided is an apparatus for carrying out the method, which apparatus includes a fluid pressure ram and means for supporting this in relation to the surface to enable the pressure to be applied to the patch. Means are provided for securing the terminal portions of the patch to the surface during application of pressure by the ram.

Abstract: The invention provides a process for repairing slag ladles for iron and steel making, the process including securing a steel plate to the exterior of the ladle over a damaged area, and subsequently forming successive welded layers within the ladle using a variety of electrodes, the lowermost layer forming a homogeneous joint with the steel plate. The invention also embraces a slag ladle produced by the above process.