Abstract: An ambulance cot having a base structure which serve as a carrier for a removable stretcher forming a top for the carrier, the carrier base having frame members which form supporting tracks to receive flanged rollers mounted on the stretcher so that the stretcher may be rolled smoothly onto the carrier or removed therefrom, the carrier also mounting locking means for fixedly yet releasably securing the stretcher to the carrier.

Abstract: A portable saw guide for operation in combination with a hand operable saw. The saw guide comprises a base member adapted for clamping to an elongated horizontally disposed workpiece supporting surface wherein a first portion of the base member extends transversely under the supporting surface while a second portion is disposed to one side thereof. A pin is rotatively associated with the second portion of the base member and includes a head section for pivotally receiving one end of an elongated guide blade. The guide blade is swingable between a substantially vertical position and a substantially horizontal position overlying the workpiece wherein the guide blade is rotatable with the pin so as to overlie the workpiece at any selected angle relative thereto. Means are also provided for locking the pin to maintain the guide blade at the selected angle.

Abstract: A gravity feed shaft furnace for direct reduction of iron ores having substantially cylindrical reducing and cooling zones, an inwardly tapering discharge zone of ellipsoidal cross section, an elongated substantially cylindrical member disposed axially within the furnace extending upwardly through the discharge and cooling zones to terminate in the reducing zone, a conical top secured to the elongated member and configured to cause uniform downward solids flow, and means for introducing hot reducing gas and cooling gas into the elongated member. Means are provided for distributing the hot reducing gas into the center of the reducing zone, for distributing the cooling gas into the center of the cooling zone, and for causing part of the cooling gas to cool the hot reducing gas distribution means.

Abstract: A rectangular carton having a self-sealing reclosable end closure which may be used with or without a liner, the end closure being adapted to lie within the confines of the carton body and having an opposing pair of vertically disposed sealing flaps biased into face-to-face contacting relation by an opposing pair of end closure flaps extending downwardly and inwardly from the carton body walls to which they are hingedly connected, the opposing pair of end closure flaps having shoulders at their opposite end edges engaged by downwardly and inwardly folded flap members hingedly connected to the remaining pair of carton body walls, the closure flaps being displaceable to open the carton by pulling upwardly on the juxtaposed sealing flaps and reclosable by juxtaposing the sealing flaps and displacing them downwardly to lie within the confines of the carton body.

Abstract: A pneumatic fastener driving tool in which a piston-driver assembly is moved in opposed working and return strokes within a cylinder. Vent passage means of a predetermined area are provided adjacent the lower end of the cylinder to permit greatly increased velocity on the working stroke. Valve means may be provided for the vent passage to enable the use of air under pressure to drive the piston in a return stroke.The cylinder may be defined by an axially movable sleeve, which cooperates with sealing means to provide one or more valving functions.

Abstract: Apparatus and method for recovery of heat from exhaust gases of dryers and return of heat to the dryer system. Fresh air is drawn through a plurality of tubes in heat exchange relation to heated exhaust gases and introduced into the drying system without intermingling of contaminated exhaust gases with the heated fresh air. The apparatus and method have particular utility in gas-fired commercial and industrial laundry dryers.

Abstract: A seam forming apparatus for forming standing seams to interconnect pairs of adjacent metallic panels.

Abstract: A manually operated surgical staple extractor comprising a pliers-like tool having first and second handle elements pivotally joined together and swingable between open and closed positions. The first handle element terminates at its forward end in a pair of elongated anvils in parallel spaced relationship. The forward ends of the anvils are angled toward each with their front-most tips substantially contiguous. The rearward ends of said anvils are provided with aligned notches, the first handle element providing a steep upwardly and rearwardly sloping surface adjacent each of the notches. The second handle element is operatively connected to a thin blade means shorter than the anvils. When the first and second handle elements are in their open position, the lower edge of the blade means lies above the anvils. When the handle elements are shifted to their closed position, the blade is pivoted downwardly such that its lower edge passes between the anvils to a position therebelow.

Abstract: The application discloses a thermally actuated switch for electric motors which have some inherent starting torque, such as shaded pole and permanent split capacitor motors. The switch operates only upon abnormal torque demand, to cut out one of the windings of a motor having two windings, or to cut out part of a tapped single winding. The switch normally occupies a first position in which both windings, or the entire winding, are energized. It includes a bimetallic element and a heater coil in series with the windings. Under normal starting and running torque conditions the switch is in the first position, and insufficient heat is generated in the heater coil to trip the switch to its second position. In the event of an abnormal starting or running torque demand, the locked rotor current will persist and will exceed the running current, and heat will be generated in the heater coil.

Abstract: A lance structure for oxygen refining of molten ferrous metal comprising three concentric metallic tubes extending through a side wall of a reaction vessel and terminating in a common discharge plane beneath the molten metal surface adjacent the side wall, the innermost tube conducting an oxygen-containing gas, the annular space between the innermost and second tube conducting a shroud gas, a pair of parallel auxiliary cooling pipes in another annular space between the second tube and the outermost tube for conducting cooling gas, the pipes being on opposite sides of the second tube in the 3 o'clock and 9 o'clock positions, and refractory material encasing the pipes and occupying the other annular space, the pipes being sufficiently remote from the second tube that cooling gas discharged therefrom does not intermingle with the oxygen. A method of oxygen refining molten steel is disclosed utilizing such a lance structure.

Abstract: In a cluster mill having individual crown adjustment drives to each saddle on at least one backing shaft to adjust the roll gap in line with each saddle, means to synchronize the drives mechanically to produce a tapered roll gap so that strip having a transverse taper in thickness can be rolled. Also means to control automatically the operation of the synchronized drives in response to the behavior of the rolled strip. Also means to synchronize the drives mechanically to produce a roll gap having a parabolic profile or any required profile to suit the incoming strip or to compensate for the crown of the mill itself.

Abstract: A method of cold-working and stress-relieving iron-chromium ferritic stainless steels of non-heat hardenable type in the AISI 400 series, thereby increasing the ultimate tensile strength while maintaining good tensile ductility. Cold-working is effected by peripherally contacting the steel, i.e., extruding and/or die drawing, to produce a "cellular structure" not attainable in cold rolling. Repetitive cold-working and stress-relief anneals between about 750.degree. and 1200.degree. F increase the ultimate tensile strength in increments and restore the tensile ductility substantially to that of the hot rolled and annealed material, while maintaining the tensile to yield ratio substantially constant. Ultimate tensile strength up to about 400 ksi in small diameter wire is attainable.

Abstract: In a beam-backed cluster-type strip mill each roll is driven separately from a vertical motor placed on top of the housing through a floating right-angle gearbox. The gearbox is keyed onto one end of each roll and is so suspended that only pure torque is transmitted to the roll and the reactions as well as the weight of the box are absorbed by the suspension means.Roll oscillating mechanism, forcing the rolls to travel axially back and forth far enough to efface marks left by the backing casters, is incorporated in the gearbox.This drive possesses substantial advantages over conventional drives, which make the mill more accessible, and save space. Moreover it makes possible various roll configurations by adding supplementary rolls to the cluster pattern thereby increasing the range and scope of the mill.

Abstract: A process and apparatus for the gaseous reduction of sized iron ores wherein a steam-hydrocarbon fluid mixture, having a steam:carbon molar ratio ranging from 0.9:1 to 1.8:1, is catalytically reformed to produce a reducing gas mixture containing about 85% to 98% by volume carbon monoxide plus hydrogen, with a hydrogen:carbon monoxide volume ratio of at least 2:1. The reducing gas is transferred directly at elevated temperatures to a shaft furnace for reduction of ores therein, and the spent reducing gas is cleaned, cooled and dried, for use as fuel and/or cooling the reduced ores.

Abstract: A stop tablet mechanism particularly suited for electric organs wherein a plurality of stop tablets lie in closely spaced apart side-by-side relation, the stop tablets being pivotally mounted in a supporting frame by means of locating ears which are maintained in positive pivotal contact with the frame by pairs of wire springs, the wire springs engaging cam defining laterally projecting shoulders on the tablets and performing the additional function of maintaining the tablets in either of two positions of use, the spring elements being configured to provide flexibly mounted detent points which coact with the noses of the cam surfaces to maintain the tablet in its desired position of use.

Abstract: The high intensity mixer utilizing a single speed motor of this invention includes a concentric pair of vertical shafts mounted in the mixer. In one embodiment a driven pulley is directly attached to the outer shaft which mounts the lower set of mixing tools and runs whenever the motor is running. The inner shaft bears the upper mixing tool and may be coupled to the outer shaft by any appropriate manual, pneumatic, fluid, centrifugal, electro-magnetic or air operated clutch means. Engagement and disengagement of the upper mixing tool may be accomplished by manual means or automatic means. Where automatic means are used they may be coupled to sensors reading temperature, amperage or other appropriate conditions.In an exemplary operation the inner and outer shafts are clutched together so as to drive both the upper and lower mixing blades at the outset.

Abstract: A flat disc is provided with pie-shaped segments of gear teeth running from the periphery towards the center of the disc in parallel relationship separated by blank segments on the face of the disc. First and second pinion gears are positioned over the face and coupled for movement towards and away from the center of the disc simultaneously along splined shafts. The geometry is such that when one of the pinion gears is in meshing engagement with a toothed segment, the other pinion gear is positioned over a blank segment. The pinion gears are thus alternately driven by the toothed segments and a change in speed ratio between the rotating disc and pinion gear shafts is effected by varying the radial distance of the pinion gears from the center of the disc.

Abstract: Apparatus and procedures for forming and filling tampon sacks with absorptive aggregate in a continuous, high speed operation, the aggregate being delivered in uniform condition to a loading gun comprising a rotary loading wheel having pockets into which measured charges of aggregate are drawn by vacuum; the loading gun delivers the charges of aggregate to a discharge nozzle which propels the discrete charges through a hollow mandrel about which a web of sack forming material is tubed, the tubing upon passing beyond the mandrel being pinched between a lugged belt and a rotary transfer wheel at spaced apart intervals corresponding to the length of the tampon sacks being formed, as defined by preprinted transverse adhesive stripes on the tubed web, the discrete charges of aggregate being captured between adjacent pairs of lugs on the belt; the filled tubing is maintained in contact with the transfer wheel by vacuum until released for delivery to a succeeding operating station, a transfer tube being provided to

Abstract: A yieldable joint between two elements such that the adjacent lapped edges of the elements will shift relative to each other. The joint comprises a pair of plates to be joined by lapping adjacent edges thereof, pairs of corresponding perforations in the lapped plate edges, and a bolt passing through each of the pairs of corresponding perforations. At least one perforation of each pair of corresponding perforations comprises a keyhole elongated in the direction along the line of relative movement of the pair of plates, with one end of the keyhole being of such size as to freely receive the shank of the bolt and the remaining elongated portion thereof being of a width less than the diameter of the shank of the bolt.

Abstract: A holding device to be used with screw drivers, nut drivers and other tools to hold or attach any type of fastener to the appropriate driver. The holding device comprises a sleeve adapted to fit over the shank portion of a driver, a pair of diverging arms at the forwardmost end of the sleeve, and a pair of springs extending between the arms adapted to receive the head and grip the shank of a fastener.