Abstract: A stack of printed circuit boards are mechanically and electrically interconnected by a plurality of double ended contact members mounted in coaxial relationship in the boards. Each double ended contact member comprises a shrouded pin contact having a socket contact extending in a direction opposite to the pin contact. The socket contact of one double ended contact member in one board slidably engages with the shrouded pin contact of the double ended contact member in the next adjacent board. The contact members in the respective boards have cooperating standoff shoulders which space the boards apart a predetermined distance.

Abstract: Slag shield for a steel converter, comprising a ring of conically set segments around the upper end of the converter. The conically set segments are each provided with two hook-carrying brackets. The hooks near the lower end of the slag shield catching around horizontal bars which are connected around and to the converter. Each segment is held with its upper edge close against the converter vessel by fastening means, which are locally provided on the vessel wall. The fastening means allow for small displacements of the segment in its own plane.

Abstract: A foundry ladle including a ladle vessel having a cavity, a layer of crushable insulating material lining the cavity, the layer having perforations extending therethrough, and a layer of castable refractory material lining the insulating material, the refractory material extending through the perforations into load supporting contact with the vessel. Also disclosed is a method of forming a foundry ladle.

Abstract: A lance for the flushing gas treatment of non-ferrous molten metals consists of a steel tube for connection with the flushing gas with a lance head made of gas permeable sintered metal welded onto the steel tube.

Abstract: A contact retention device is disclosed for positively retaining a contact within a housing in such manner that no special insertion or extraction tools are required to respectively mount and dismount the contact and which will provide an audible indication when the contact is positively latched properly. The subject retention device includes a spring member having one end mounted fixedly in a connector housing and the other end spring biased against a free end of a blade contact with a portion of the spring member projecting beyond the end of the contact to form a contact release tab. The retention device not only serves to secure the contact within the housing but it adds to the resilience of the contact to bias it into engagement with a mating contact.

Abstract: In a method of producing iron by direct reduction of the ore, compaction into agglomerates and fusion, where the ore is reduced by a gaseous process with pre-reduction to monoxide FeO at 1000.degree. C., followed by a final reduction at 700.degree. C. The resultant powder is compacted into agglomerates and dumped, in successive loads after each pour, into an induction melting furnace and melted by contact and mixing with a preexistent charge of liquid metal. An amount equivalent to the newly-melted charge is poured into a refining ladle, after skimming off the slag.

Abstract: Molten slag discharged from a metallurgical furnace and flowing down from a slag trough is atomized by air jet into a primary heat-exchanger of rotary cylindrical type and hot slag granules thus obtained and air are caused to pass in a co-current therethrough so as to exchange the heat of the slag to the air flow to obtain a primary hot blast, then the hot slag granules discharged from the primary heat-exchanger are supplied to a secondary heat-exchanger connected to the primary heat-exchanger where the hot slag granules are brought into contact with a counter flow of cold air supplied from outside the system, or with a counter flow of a mixture of the above cold air and a part of the primary hot blast exhausted from the primary heat exchanger to effect heat-exchange and to recover a secondary hot blast.

Abstract: An apparatus for hardening the cam tracks of camshafts in which one or more camshafts to be hardened are mounted adjacent a master camshaft for synchronous rotation therewith. A plurality of burners are slidably mounted adjacent each track to be hardened for movement toward and away from the track. A follower on the corresponding track of the master camshaft controls movement of the burner. An eccentric oscillates a plate on which the camshafts are mounted to cover all of the cam track. The burner is turned on and off so that the zone of the cam base circle is not heated and remains unhardened.

Abstract: A contact assembly which includes a contact holder having means integral therewith for electrically terminating a lead wire. A contact element is slidably disposed in the contact holder and includes an outwardly protruding tang for engaging a closed slot in the contact holder thereby retaining the contact element in the contact holder.

Abstract: Summarizing, the present invention provides a hot blast or hot gas valve, particularly for a blast furnace, comprising a liquid or water cooled valve disc adapted to be moved axially for adjustment, wherein said valve disc is formed to be arched unilaterally towards the side of said valve to be shut off, said valve disc including around the sealing edge thereof a hollow section through which coolant flows, and the concave side of said valve disc opposite from the closure side of said valve being covered by a layer or lining of a refractory material, particularly by a ceramic brickwork, within the area enclosed, for instance, by said water cooled hollow section.

Abstract: There is disclosed a pinning machine having an improved plunger, an improved guide track and an improved knife assembly. The plunger has relatively movable sections threadably connected together to enable the length of the plunger to be changed so that tags can be pinned to different thicknesses of merchandise by changing the plunger length. The guide track includes a one-piece leaf spring which acts against one edge of a web of record members to urge the other side of the web against an edge guide. The spring is resiliently held in captivity in a recess without being secured in the recess as by fasteners. The knife assembly includes a pair of fixed knives separated by a gap and a movable knife guided by guide means in the gap. The movable knife is floatingly or loosely mounted so that the guide means is the sole means for guiding the movable knife relative to the fixed knives.

Abstract: A connective electrical wiring element particularly useful in providing the wiring for miniature buildings (e.g. doll houses) is described. This element permits the user to connect electrical fixtures, appliances, lights, and the like in a facile manner while at the same time providing integral construction portions of the building. The wiring elements are decorative as well as functional.

Abstract: In a clutch disk assembly having two structural units formed with window-shaped cutouts, at least two coaxially disposed force-storage devices received in the cutouts and braced against the structural units so as to afford limited torsional play of the structural units relative to one another, one of the structural units including two lateral disks mutually spaced-apart from one another in axial direction of the clutch disk assembly, the other of the structural units including at least one disk-like member disposed in the axial space between the two lateral disks, the two force storage devices includes a radially inner and a radially outer force storer, the radially inner force storer extending along the length of the radially outer force storer and, as viewed in circumferential direction of the lateral disks, having a portion thereof projecting beyond at least one end of the radially outer force storer, the cutouts being defined by contour portions of the two structural units conforming both to the radially

Abstract: A hood arranged at a blowing stand of a steel making plant for diverting the smoke and flue gases emerging during charging of a converter, totally covers the converter mouth at a vertical distance thereabove so as to leave room for the charging container, and includes closeable recesses, into and out of which the carrying devices of a crane guiding the charging container can be moved.

Abstract: The solid treatment material is contained in rotationally symmetrical, flotation body having a ballast weight and openings for discharging jets of vaporized treatment material into the steel while the body floats, and the jets have a tangential component so that the body rotates and wobbles and the jets vary their direction to distribute the treatment material.

Abstract: A flash smelting furnace has an outer metallic shell from which portions are cut out to expose the outer surface of the refractory lining at a depth corresponding to the location of the matte-slag interface, and gaseous cooling jets are directed onto the exposed refractory lining.

Abstract: A hot metal ladle tilter including a support stand having spaced-apart bearings, a ladle support frame pivotally mounted on the bearings for tilting about a tilt axis, the ladle support frame including two spaced-apart support members for readily receiving thereon a ladle to be tilted, a stop bracket fixedly positioned and engaging the ladle support frame to prevent the tilting thereof rearwardly, the center of gravity of the ladle support frame in combination with the ladle being disposed rearwardly with respect to the tilt axis to urge the ladle support frame against the stop bracket under gravity, an hydraulic motor for pivoting the ladle support frame about the tilt axis, and controls for actuating the hydraulic motor.

Abstract: A comminuter for metal turnings and the like has a rotor rotatable on a support about a fixed axis and carrying at least one outer rotor element and at least one inner rotor element which define a cylindrical orbit on rotation of the rotor. A housing surrounds this rotor and is formed by a U-shaped upwardly open portion of non-tapering cross-sectional shape and a flat cover part engageable over the open upper side and openable in order to clear a jam in the machine. Stator elements carried on this housing are spaced slightly from the rotor element so that as the rotor turns turnings and the like fed to the machine will be comminuted and passed from an inlet to an outlet end.

Abstract: A device for use in relining a refractory-lined cover of a large vessel, particularly a tundish used in continuous casting of metals. The device comprises a stationary table and a rectangular frame hingedly supported at one edge of the table to be turned between a first position alongside the table and a second position overlying the table. An upright cover is fixed temporarily to the frame in the first position. The frame and cover are turned to the second position and the old refractory chipped out. Next they are returned to the first position to dump the old refractory. They are turned back to the second position to install new refractory.

Abstract: Blast furnace tuyeres and like hollow-walled cooling devices have one or more water inlet conduits in the wall formed with a terminal constriction so as to discharge cooling water as a high speed jet against the specially contoured inside surface of the nose preferably normal to the tuyere end. The jet impinges on that inside surface at a low angle and the surface is curved to change the direction of the jet preferably by 90.degree. or more, so that the stream is held against the surface to be cooled not only by the force of the jet but also by centrifugal force.