Abstract: A backflow preventer on the end of a plastifying screw for an injection molding apparatus has a housing provided with radial bores which are axially and angularly offset. A pin accessible from the exterior of the housing passes through a radial hole but traversing in a valve member with clearance to permit the stroke of the valve member to be adjusted by selective insertion of the pin in the bores.

Abstract: A bogie for a railroad vehicle comprises a pair of wheel sets mounted in a frame which is pivotally connected to the vehicle so that it can rotate about a substantially upright axis. The wheel sets are connected to the frame resiliently and by links which, upon the application of unbalanced force, axially to one of the wheel sets shifts the force-receiving end toward the other wheel set. The links can also be disposed so that any tendency for one of the wheel sets to move downwardly relative to the frame will result in a tendency for it also to move closer to the other wheel set. This has been found to increase high speed stability of the vehicle.

Abstract: A mixing head for two reactive components, e.g. the components of a settable synthetic resin mixture, comprises a mixing chamber in which a plunger is shiftable to block and unblock the nozzle orifices and drive the reaction mixture from the chamber through an outlet. At least one of the nozzles is carried on a readily shifting slider which cooperates with a similarly shiftable obturating member to define a small premixing chamber, as desired, and deflect the mixture through at least 90.degree. within the mixing chamber. This system is especially effective for the mixing of reactive components which have hitherto been found to be difficult to mix with conventional mixing heads.

Abstract: A linear stator magnet in which the yoke stack is pole shanks flanked by cheek plates which are overlapped by the stabilizing yoke plates and are form and force-locked to projections of these yoke plates. Additional excitation coils are provided around the pole shoes and are connected in circuit with the main excitation coils around the pole shanks so that these additional excitation coils are provided in the gaps between the successive pole shoes and stray flux is minimized.

Abstract: A rotary shock absorber whose rotor and stator have interfitting annular disks or coaxial cylinders and which receives a dilatant copolymer dispersion. The shock absorber is especially effective for use between a support arm and wheel for the track of a tracked vehicle.

Abstract: A mixing head for two reactive components has a mixing chamber provided with a control plunger enabling recirculation and opening at right angles into a quieting passage which is provided with a control plunger adapted to selectively obstruct the outlet of the mixing chamber into the quieting passage. According to the invention an adjustable abutment is provided for the latter plunger to enable the obstruction to be completely removed during one phase of each cycle of the actuation of the apparatus. This abutment can be an annular piston under the control of fluid pressure.

Abstract: A backflow preventer at the end of an injection molding worm has a pressure ring which abuts directly upon the worm and serves a shank of the valvehead which also bottoms in a bore upon the worm so that force transmission to the worm is over its entire cross section. The shank is surrounded by a blocking ring which can shift in its axial stroke between a position in which it abuts the head and a position in which it abuts the pressure ring, the axial stroke being adjustable by shims forming the floor against which the shank abuts within the bore of the worm.

Abstract: A plate-type dryer or like heat-treatment apparatus has a plurality of annular horizontal plates upon which material is treated while a shaft surrounded by these plates carries a plurality of generally radial arms from which scraper blades are suspended. According to the invention, each blade is carried by a hanger which is pivotally mounted on the arm and reaches rearwardly to support the blade, another pivot providing a further degree of freedom ensuring full line contact of the lower edge of the blade with the plate.

Abstract: A mixing head for two reactive components forms a mixture in a mixing chamber when a control plunger is retracted, the mixture passing into a channel at right angles to the mixing chamber. A second plunger in the channel is partially retracted so that its free end is positioned in line with the opening to form a partial obstruction around which the mixture is formed. Then the second plunger is retracted to allow clearing of residues, and advanced to drive residues from the channel.

Abstract: A method of operating a particle-treating apparatus having a hollow foraminous drum centered on and rotatable about an upright axis comprises the steps of feeding particles into the upper portion of the interior of the drum, rotating the drum about the axis at a speed sufficient to form the particles into an annular body lying on the inner surface of the drum, passing a drying gas radially inward through the drum into the interior thereof and withdrawing the gas axially from the interior to at least partially fluidize the body and dry the particles, and collecting the particles beneath the drum as the body moves off the lower edge thereof. The rate of gas flow through the drum and the rotation rate of the drum are such that the body moves axially down in the interior toward the lower edge of the drum.

Abstract: A tank turret has a forward crew compartment separated by an armored partition from a rear munitions compartment. The rounds are stored in a nonrotatable sector and are turned toward a space at the centrum of the sector at which a loading device is rotatable to extract rounds from the magazine and feed them through a hole in the partition into the breach opening.

Abstract: A centrifugal filter has a centrifuge drum rotatable about an axis and provided with a plurality of sieve support plates lining the drum. Each of the plates is generally flat and rectangular and has a radially inwardly directed inner face. They are each formed with an array of flow grooves extending on and opening radially inwardly at the inner face and each having an outer end and an inner end spaced along the plate therefrom. The flow grooves are of increasing flow cross section from their outer ends to their inner ends. An outlet serves for draining liquid from the inner ends. A filter medium overlies the inner face over the flow grooves. Thus flow is maintained substantially uniform even at the outer groove ends, where relatively little filtrate moves. As a result clogging of these flow grooves is impossible; they will stay clear along their entire lengths.

Abstract: An armored vehicle with a rotatable turret, e.g. a tank, has its gun (cannon) supplied from a munitions bunker behind the turret in which the munitions rounds are stored in tubes inclined at angles less than 90.degree. to the axis of the gun when the breech thereof is aligned with an opening in the magazine through which the rounds are fed from a tunnel in the magazine aligned with the gun. The rounds lie in substantially horizontal planes and are withdrawn from storage tubes by a device movable axially along the tunnel and swingable into alignment with each tube to withdraw the round therefrom and feed it through the opening into the breech of the gun.

Abstract: A track structure for a tracked vehicle especially a tank, comprises a track whose tread links are joined in the continuous chain by intermediate links such that the tread links have a spacing x from one another. The tread chain passes around running-wheel assemblies supporting the chassis of the vehicle, each assembly having a pair of rollers journaled adjacent one another at horizontally spaced axes such that the spacing X of the two rollers of each assembly from one another is equal to 1x to 1.5x, inclusive. This reduces shock transmission to the vehicle as the flat links pass around the roller assemblies.

Abstract: A process for the dewatering and particle classification of solids from suspensions, e.g. coal from a slurry in which the coal is transported, makes use of a dewatering centrifuge having two frustoconical centrifuge drum sections of different inclinations such that in a first filtering zone the particles are preliminarily dewatered and then pass by automigration to the next centrifuge drum at which further dewatering takes place. The suspension on the first sieve surface forms a thin layer classification zone having a thickness up to 5 mm and in which the coarse fraction is retained while the fine fraction is passed. The coarse fraction automigrates to the next sieve surface where it is dewatered and the fine fraction separated out in the thin layer classifying zone is then filtered under pressure in a subsequent stage.

Abstract: A mixing head for mutually reactive components, e.g. of a synthetic resin to be injected into a mold cavity, comprisess a control member which is shiftable in a mixing chamber opening into the mold cavity between a position in which mixing of the components can occur in this chamber and a position in which the member expels the mixture from the chamber and provides recirculating passages for the two components. A displacement body can be inserted into the chamber to control the mixing action by a fluid-operated actuator hydraulically coupled to a fluid displacement member shifted by the control member.

Abstract: A three-way or three-ported flow-regulating valve for use in a hydraulic system comprises a two-position two-ported throttle valve inserted between an inflow conduit and an outflow conduit and a pressure-relief valve connected to the inflow conduit at an upstream point thereof and at a downstream point proximate to an intake port of the throttle valve. A servovalve is connected in parallel to the throttle valve via small-diameter pressure-transmission channels extending to the intake port and to an output port of the throttle valve. Upon a jump in the pressurization of the inflow conduit, for example due to the activation of an auxiliary pump, the pressure-relief valve opens; it closes again only upon an equalization of the pressure throughout the inflow conduit. The servovalve has a biasing spring which exerts a force determining the maximum pressure drop across the throttle valve.

Abstract: Disclosed are a method of and an apparatus for determining entrained gas content in a liquid, especially a liquid synthetic-resin component adapted to form a foamed or cellular synthetic-resin body. Pressure pulses are applied to the liquid and pressure oscillations therein are detected, the amplitude .DELTA.p and/or the phase position of a peak being detected and evaluated to give the gas content. The determination may be used to control the addition of the gas to the liquid and/or can be displayed to permit operator control of the system.

Abstract: At an injection-molding machine, an assembly for clamping a mold half to a platen comprises a bore therein and a projection on a substantially planar face of the mold half. The projection includes an annular flange insertable into the platen bore and an annular groove defined in part by an inclined or beveled surface of the flange. A pair of sliding plates are reciprocatably mounted in the platen for shifting from withdrawn positions inwardly to locking positions, the plates having beveled inner edges for coacting with the inclined flange surface to clamp the mold half to the platen. The bore is advantageously formed with a conical extension for accepting the head or nozzle of an injection device or extruder. Another mold half may be clamped in an analogous manner to another platen provided with a bore and reciprocatably mounted locking plates, the two platens being shiftable relatively towards each other.

Abstract: A mold-handling apparatus in which a pair of mold carriers can be locked together for the molding process but, upon separation, each tilts through 45.degree. to afford improved access to the mold halves following a molding operation or before a molding operation. According to the invention, the upper mold carrier is swung about a fixed axis by a fluid-operated cylinder while another fluid-operated cylinder shifts a slider vertically to lower the pivot of the lower mold carrier and enable the latter to engage abutments which tilt the lower carrier.