Abstract: A fully mounted implement for working the soil comprising a main frame formed by an angled beam, two transverse beams and a longitudinal beam, soil working elements arranged along the angled beams which is at an angle between 35.degree. and 70.degree. to the longitudinal beam; mounting structure for connecting the implement to a three arm lift of a tractive vehicle including a traction frame defining a transverse slot and having connecting structure for connection to two lower arms of the three arm lift; an upright pin passing through the slot and having connecting structure to any transverse position of one transverse beam of the main frame; and a longitudinal tower beam having connecting structure for connection to a third arm of the three arm lift and connecting structure to any transverse position of both the transverse beams of the main frame. Demountable extensions for the angled beam carrying soil working elements are described.

Abstract: The invention relates to a power door opener, such as the type of opener used for opening overhead garage doors includes a worm gear rod having a major thread and a carrier member coupled to the door and releasably engageable with the major thread for moving the door between open and closed positions as the rod rotates. A second thread whose pitch is smaller than the major thread is formed on the rod and on a portion thereof located between a pair of spaced apart limit switches. A control member threadably engages the second thread for movement between the limit switches as the rod rotates for terminating motor operation as the door moves into its open and closed positions. The carrier member is mounted for radial movement into and out of engagement with the major thread to permit manual operation of the door.

Abstract: A power lawn mower has a drive which includes a pair of pulleys affixed to a shaft which is rotatably supported on a pair of arms which are each mounted at one end for pivotal movement about the axis of the engine power takeoff shaft. The arms are also supported intermediate their ends by rods which are pivotally supported at the lower ends on the rear wheel axles. A belt and a pair of pulleys couple the power takeoff shaft to the pulley shaft. A second pair of belts and pulleys couple the pulley shaft to pulleys affixed to each of the rear wheels.

Abstract: An electric arc furnace has a plurality of electrodes each supported at one end of an arm, the other ends of which are each coupled to a column supported for vertical movement by means of a cable assembly. A fail-safe assembly is mounted adjacent the column and is coupled to the cable assembly. While tension is maintained in the support cable a linkage assembly normally restrains a biasing spring from moving a clamping wedge into engagement with the column to prevent vertical movement thereof. When tension is lost in the cable assembly the biasing spring is released to move the wedge into engagement with the column.

Abstract: A method of treating ferrous metal in a metallurgical vessel having a plurality of two-pipe tuyeres extending generally upwardly through the vessel bottom and in spaced apart relation relative to each other. A flux, such as line, is first blown into the ferrous metal charge through the center tuyere pipe along with the process gas and a second gas is delivered to the outer tuyere pipe. After fluxing, a first process gas consisting principally of oxygen is blown into the charge through the center tuyere pipe along with a sheath of hydrocarbon shielding fluid delivered through the outer tuyere pipe. After a significant portion of carbon oxidation has proceeded to the point where excess oxygen would tend to oxidize chromium or iron, argon is mixed with the oxygen in the center tuyere pipe to the point where it equals or exceeds the proportion of oxygen while the delivery of hydrocarbon shielding fluid is continued through the outer tuyere pipe.

Abstract: A nickel-chromium alloy composed of the following ingredients in the following ranges of percentage by weight:______________________________________ Ni 47.00 - 50.00 Cr 34.00 - 40.00 Cu .05 - .08 Fe 3.00 - 6.00 C .18 - .30 Si .75 - 1.50 Mn .10 - .30 Co .75 - 1.50 Mo 2.50 - 3.

Abstract: A hot metal mixer has an elongate hollow vessel mounted for rotation about a longitudinal axis adjacent each end on a cradle, each of which is supported on pairs of parallel trucks disposed on separate sets of rails. Each cradle extends transversely between the trucks of each pair and is coupled to one truck by a spherical bearing and to the other by spherical and roller bearings to permit thermal expansion and contraction, slight track misalignment and travel around curves. A pair of spouts for receiving or pouring metal are disposed in the upper side portion of the vessel and in spaced relation from the top center.

Abstract: Latch sets must be fitted with a flat face of the latch bolt parallel to a major door face such that the bolt is correctly received in the door frame bolt recess. Latch sets comprise the handles, actuating mechanism, and latch bolt case including the bolt. Here, the latch bolt case is adapted for correct alignment of the latch bolt flat face when the latch bolt case is positioned in a latch bolt case passageway. The latch bolt case is provided with a self-retaining non-cylindrical end portion to avoid the need for recessing the door edge for a latch bolt case plate. Instead, a jig is provided for guiding the case into a retained position within the passageway in which it is a progressive force fit.

Abstract: A nickel-chromium alloy composed of the following ingredients in the following ranges of percentage by weight:______________________________________ Ni 41.8 - 46.2 Cr 36.72 - 40.58 W 2.23 - 2.47 Fe 2.71 - 2.99 C .13 - .17 Si 1.23 - 1.37 Mn .99 - 1.09 Co 3.48 - 3.84 Mo 5.70 - 6.

Abstract: An open topped, refractory lined metallurgical converter vessel has a metallic shell. A cooling jacket is affixed to the frusto-conical nose portion of the shell and comprises a plurality of right angle members affixed to the shell in a side-by-side relation and extending generally in the axial direction. The members have their edges respectively affixed to the shell surface and to the side of the next adjacent member such that one leg of each member is perpendicular and the other is parallel to the vessel surface. An opening is formed in the perpendicular leg of each angle member with the opening in adjacent members located at opposite ends to define a serpentine water flow path therethrough. Plate sections are affixed to the upper end of the angle members and to the shell to define a nose cooling ring and return flow path for cooling water. Further arcuate plate sections which at least partially surround the vessel at the lower ends of the angle members define water inlet and return flow paths.

Abstract: In a cleaning system for heat exchanger tubes each tube has a chamber at its end for capturing a tube cleaning element such as a brush that is subject to being propelled in opposite directions through the tube by reversing the direction of fluid flow therein. Novel means are provided for enabling access to the tube through the chamber for such purposes as replacing brushes and admitting a flaw detector to the tube.

Abstract: An electric arc furnace has a body mounted on a pivotable platform and electrodes which extend through a furnace cover. A gantry supports the cover and electrode and is mounted on a rail for swinging movement onto and off of the platform to move the cover and electrodes from above the furnace body to a remote position. A pair of support columns are mounted below the edge of the platform over which the gantry moves and each column is pivotal into and out of a vertical supporting position to permit the platform to pivot. Shock absorbers limit pivotal movement of the platform in each direction and cushion engagement between the platform and the columns.

Abstract: A tuyere assembly for use in metallurgical vessels includes a tubular metallic tuyere housing which is cast in a book of refractory material. When the tuyere block is installed in a metallurgical vessel, a tuyere is inserted within the tubular tuyere housing and the space between the tuyere assembly and the housing sealed with a suitable refractory material. After a significant portion of the tuyere assembly has burned away during metallurgical operations, the tuyere may be withdrawn from the tuyere housing and a new tuyere substituted. Any refractory lining which has burned away in the vicinity of the new tuyere may be built up with a chemically bonded gunning mixture which sets to form a dense refractory material around the tuyere assembly.

Abstract: A combination electrodialysis method and apparatus comprising ultrafiltration membrane cell pairs interposed between a cation-selective membrane and an ion-nonselective membrane. The solution to be treated is fed to one side of the ultrafiltration membrane cell, a concentrating solution is delivered between the cation-selective and ion-nonselective membranes, and an electric field is applied across the assembly. Cations pass through the ion-selective membrane, ions of both polarities and weakly ionized substances pass through the ultrafiltration membrane which rejects the larger sized particles and molecules and anions pass through the ion-nonselective membrane to maintain electrical balance.

Abstract: A pair of metallurgical vessels are each coupled by a gas collecting hood having a movable skirt to a gas cleaning system which includes an exhaust fan and a quencher and scrubber each having flow varying means. Each vessel is surrounded by an enclosure having an access door toward which the open upper end of the vessel may be tilted for receiving a metal charge. A secondary gas collecting hood is disposed in each enclosure above the access door for creating an indraft when the door is open. A valve system permits the selective connection of the secondary hood of one enclosure to the fan of the other to increase the indraft during furnace charging, sampling and pouring.

Abstract: A molten metal processing vessel is surrounded by a trunnion ring. A plurality of flat beam members are affixed at one end to the trunnion ring and their other ends are each apertured for pivotally engaging one of a plurality of pins extending fixedly from the vessel.

Abstract: A method and apparatus for heating articles, such as eyeglass frames, includes a bed of heat retentive beads supported above a plenum chamber by a mesh or screen. Heated air is delivered to the plenum chamber at low velocity and high volume for flowing upwardly through the bed for heating the same. The air is directed through the plenum chamber by bodies which act as baffles as well as a heat sink.