Abstract: Apparatus for use in repairing the lining of a metallurgical furnace or converter includes a work platform supported for elevation from below the converter vessel into the opening formed by removal of the bottom plug. A safety shield is supported above the platform for limited vertical movement relative to the platform. The shield can be radially expanded within the converter to a diameter substantially greater than that of the bottom hole to provide an effective umbrella-like shield protecting workers on the platform from radiated heat from the interior of the converter and from falling debris while at the same time allowing ventilation air to pass up through the converter. The apparatus is especially useful in repairing the refractory lining in the bottom of a Q-BOF, particularly the refractory rings surrounding the bottom plug, during which repair the safety shield can be lowered to contact the bottom of the refractory lining outboard of the area being repaired.

Abstract: An improved method of and apparatus for hot dip metal coating of steel strip in which the strip is heated and cleaned in a furnace then passed through a protective hood containing a reducing gas and into the molten coating metal bath. Coating metal oxides evolved in the hood are removed by flowing a nonoxidizing gas across the surface of the coating metal in the hood and withdrawing the gas and entrained oxides from a location in the vicinity of the coating metal surface. The oxides are removed from the withdrawn gas, and the gas returned to be again flowed across the coating metal surface.

Abstract: Apparatus for cutting flat bottomed daps in heavy timber includes conveyor means for moving the timber through the apparatus and a cutter head operable to cut a relatively wide dap in one surface of the timber. The cutter head is supported for movement to adjust the depth of the dap and to adapt the apparatus to dap timber of various sizes. The cutter head is also supported for limited movement longitudinally of the timber along a track mounted for limited pivotal movement about an axis extending in spaced relation to and transversely of the timber whereby the angle of the bottom surface of the dap relative to the longitudinal axis of the timber can be varied. By moving the cutter head to a plurality of positions along its pivotal support track and moving the cutter head and timber relatively to one another to make a dap at each position with the daps either overlapping or being spaced from one another, the bottom surface of the respective daps will all lie in a common plane.

Abstract: Drawn and ironed can bodies are formed from cold rolled steel sheet having a thin coating of a nickel-zinc alloy electroplated thereon by drawing the coated steel into a cup and ironing the sidewall of the cup on a mandrel by passing it through a toolpack comprising a plurality of ironing rings each including a generally conical lead-in surface having an angle relative to the axis of the mandrel within the range of 6.degree. to 81/2.degree. and a substantially cylindrical land extending no more than about 0.025 inches in the axial direction of the toolpack through the rings. The diameter of the land on successive ironing rings is progressively smaller in the direction of movement of the can through the toolpack, with the diameter of the final ironing ring being such as to reduce the sidewall of the cup to about one half its original thickness. The length of the land of the final ironing ring may be less than that of the previous ironing rings and preferably is within the range of 0.003 to 0.007 inches.

Abstract: An improved sheet steel suitable for the production of containers and the like has a thin composite coating of nickel and zinc plated on both sides thereof. The steel substrate may be flat rolled blackplate and the composite nickel-zinc coating may be plated thereon by drawing a running length or strip of the steel through a nickel electroplating bath to which has been added the necessary concentration of zinc, and electrodepositing the two coating metals simultaneously and in the desired proportions. The coated steel sheet is particularly useful in forming drawn and ironed cans although it may be used for other purposes.

Abstract: A high temperature refractory brick wall is repaired by removing and replacing damaged brick while the wall is maintained at a temperature below normal operating temperature but sufficiently high to avoid damage from contraction resulting from cooling. New brick having a coefficient of thermal expansion compatible with the heated wall are used to avoid cracking of the wall due to expansion during heat-up. Workers wearing protective clothing, preferably incorporating a circulating fluid cooling system, remove the damaged brick and install new brick in their place in walls having surface temperatures of about 500.degree. F. or higher and internal temperatures substantially above 500.degree. F., preferably at least about 1500.degree. F.

Abstract: A free standing outdoor telephone booth is provided with a photo voltaic (PV) array, one or more rechargeable storage batteries and electrical control circuit which includes a temperature compensated control for limiting the supply of electrical energy from the PV array to the rechargeable battery to avoid over charging the battery, an ambient light (solar insolation) sensing circuit for controlling the electrical lamp load, to turn the lamp ON during dark ambient and OFF during light ambient conditions. In addition, the total discharge limit of the storage battery is controlled to a safe operating limit and a means is disclosed to power a fluorescent lamp at energy conserving intensities with energy derived from the rechargeable storage battery. The lamp control circuitry is preferably constituted by a high frequency power inverter with regulated output power to energize a low wattage fluorescent lamp and to dim the fluorescent lamp when the telephone is not in use.

Abstract: An improved method is disclosed for producing cathode aluminum foil for electolytic capcitors in which aluminum foil of 98.0% to 99.99% purity is etched in an electrolytic bath containing a chloride or hydrochloric acid in water solution while subjected to an AC and/or DC current, and treated following etching by immersion in an aqueous solution of nitric acid containing about 2.5 to about 3.7 weight percent nitric acid, rinsing, and immersion in an aqueous solution containing about 1.5 to about 5.0 weight percent chromic acid and about 3.0 to about 5.0 weight percent phosphoric acid, again rinsed to substantially completely remove chloride ions from the etched foil surface and increase the capacitance of the foil, and to substantially reduce the capacitance decay rate of the treated foil. The treated foil may be passivated in an aqueous solution of a carboxyl acid, preferably a 1.5 to 5.0 weight percent solution of citric acid in deionized water, before drying.

Abstract: An electroplating process is disclosed for coating metal strip or sheet with a nickel-zinc alloy comprising at least 80% nickel. Steel sheet coated with the alloy exhibits excellent weldability.

Abstract: An improved method and apparatus for deep drawing metal containers is disclosed in which flat sheet metal blanks are initially drawn into shallow cups having an open top, a substantially flat bottom wall, a substantially cylindrical sidewall and a curved transition section joining the bottom wall and sidewall. A redraw sleeve adapted to fit into and support the cups has a first annular clamping surface on its free end contoured and arranged to engage the transition section and the adjacent annular peripheral portion of the bottom wall of a cup. An annular redraw die is supported for movement from a retracted position spaced from the redraw sleeve to a clamping position cooperating with the redraw sleeve to clamp and hold the cups during redrawing. The redraw die has a second clamping surface contoured to engage the outer surface of the transition section and the adjacent annular peripheral portion of the bottom wall of a cup supported on the redraw sleeve.

Abstract: An insulated multiple component single plane building structure portal closure embodying as components thereof a portal closure frame with glazing frame transversely disposed parallel tracks aligned the opposite sides thereof and adapted through use of glazing frame hardware in combination therewith to slidably receive therein one or more glazing frame sashes or panels in either a vertically or horizontally operable window or door assembly wherein the respective sash or panel members thereof are displaceable from a contiguous abutting single plane configuration within the portal closure frame track structure for parallelly slidable displaced movement for opening structure inward pivotal tilting, and removal therefrom or replacement thereto, wherein the entire portal closure frame and glazing frame structures incorporate complementary to the single plane secured closure configuration thereof transverse thermal barrier connectors intermediate the building structure interior and exterior exposure surfaces thereo