Abstract: An evertable drum centrifuge has a drum with a generally cylindrical and perforate outer wall and having an axially forwardly open front end. An end wall of the drum can move axially between a closed position fitting in the front outer-wall end and an open position spaced axially forward of the outer wall and is centrally formed with a fill opening. An annular liner of a flexible foraminous filter medium has a front edge attached to the outer-wall end and a back edge attached to a rim of extension structure fixed on the end wall. When the end wall move between the closed and open positions, the liner moves from a normal position inside the drum and extending backward from the front end to the rim to an everted position substantially outside the drum and extending forward in the solids compartment from the front end to the rim. An axially displaceable fill tube carries an axially nondisplaceable fill head complementarily engageable in the fill opening and having an annular seal engageable with the fill tube.

Abstract: A device for producing synthetic plastic molded sheets including a mold rotatable about at least one axis and receiving a thermoplastic synthetic resin powder which is sequentially heated and cooled by liquid heating and cooling medium admitted into a hollow chamber of the mold, and a housing formed with a housing wall provided with a plurality of bulges for compensating thermal stresses resulting from different materials of the housing wall and a wall of the chamber.

Abstract: A centrifuge has an upper wall formed with an inspection port, a cover engageable over the port, and an annular seal on the cover compressible against the port in a closed position of the cover. A hinge and operating assembly has a hydraulic cylinder/piston unit having one end pivoted on the housing, at least one pivot lug on the cover defining a cover axis, at least one pivot lug on the housing defining a housing axis parallel to the cover axis, and a support link having one end pivoted on the housing pivot lug at the housing axis and an opposite end defining a support axis. An operating lever centrally pivoted on the opposite end of the support link at the support axis has an end portion extending from the support axis and connected to the opposite end of the hydraulic unit and an opposite end portion on pivoted to one end of an operating link having an opposite end pivoted on the cover lug at the cover axis.

Abstract: An ammunition drum for a large caliber weapon may have two or more drum elements with parallel rotating axles. The ammunition is located in one or more concentric layers of ammunition holders around the rotating axles. To reduce the structural volume and to simplify the loading process, each of the drum elements may contain a recess extending at least (in the width of an ammunition) partially over the length of the drum element and from the circumference of the drum element at least partially to its rotating axle. The drum elements are located relative to each other in a manner such that in an alternating sequence in the position of one drum element in which its recess is located in the connecting plane between the rotating axles of the drum elements, the other drum element may be positioned with all of its ammunition holders in this connecting plane, from where the ammunition may be transferred in a translatory motion into the weapon.

Abstract: A molding system has a base, a fixed mold plate secured to the base, a fixed mold half carried on the fixed mold plate, a movable mold plate displaceable on the base longitudinally forward away from the fixed mold half and backward toward the fixed mold half, and a movable mold half carried on the movable plate and fittable with the fixed mold half. A mold-closing apparatus has a pair of main cylinders fixed to the fixed mold half and respective main pistons subdividing the main cylinders into respective front and rear main compartments and each having a piston rod secured to the movable mold plate and formed with a longitudinally extending chamber. A small-diameter fast-closing piston and cylinder are formed in one of the piston rods, and the other piston rod is provided internally with a force-amplifying piston unit. Two flow-control valves and check valves control the system.

Abstract: A resin article is made between an outer concave mold part and an inner convex mold part that can fit together so that respective surfaces form a substantially closed mold cavity. This is done by first lining the surface of the outer mold part with a liner sheet and then fitting the lined outer mold part to the inner mold part to form the substantially closed mold cavity. A portion of the surface of the inner mold part is positioned to form a pocket open inward into the cavity and this pocket is filled with a mass of fluent synthetic resin. The surface portion is then pressed inward while the parts are fitted together and without otherwise relatively moving the mold parts to force the resin mass from the pocket into the cavity until the inner-part surface portion lies substantially flush with the rest of the inner-part surface.

Abstract: An aircraft towing vehicle including a chassis formed with a recess receiving a towing device for securing a nose wheel of an aircraft and including a transversely tiltable bearing frame, a vertically displaceable and longitudinally swingable lifting cradle provided with a pair of telescopic traction arms having respective gripping devices on respective rearward ends, the arms being longitudinally displaceable and adapted to swing about respective transverse axes, bringing thereby the gripping devices upwardly to engage the circumference of the nose wheel above an axle thereof.

Abstract: A discontinuously operated filter centrifuge has its noninverting filter bag attached only to the filter bottom which is displaceable out of the filter drum, so that when the filter bag is displaced out of the filter drum, a clearance is provided between the filter bag and drum to enable inspection of the interior of the drum.

Abstract: A mold closing apparatus and process for use with an injection molding machine are described. The mold is opened and closed by hydraulic pressure. The disclosed apparatus and method relate to the use of an immobile differential piston within a displaceable, double-action differential piston which moves within an immobile piston cylinder. This arrangement permits the use of smaller diameters to produce the necessary closing force. The immobile differential piston contains the necessary hydraulic passage for routing hydraulic fluid to the appropriate surfaces for exerting opening and closing forces. The use of a plurality of displaceable, single-acting pistons in parallel with the differential piston further reduces the diameters needed for exerting the claim force. Locating these single-acting pistons within the support column cylinders makes for an ever more compact apparatus.

Abstract: A mixing head for a mold can receive two or more reactive synthetic resin components in a mixing chamber in which a mixing-chamber piston is displaceable to drive the residues into a first calming chamber communicating with the outlet of the mixing chamber. The first calming chamber also has a piston or plunger which can be advanced to drive the residues into a second calming chamber connected to the outlet of the first calming chamber. The second calming chamber has a second piston displacing the mixture into the mold cavity. Because the pistons of the first and second calming chambers can be retracted as the mixture flows through these chambers, a highly effective calming effect can be obtained for the turbulent mixture of the mixing chamber without throttling.

Abstract: Through three separate passages opening in a common plane at right angles to one another into a mixing chamber, three components of a reactant polyurethane or polyurea elastomer composition to form in a mold cavity are introduced. One of the components is an aliphatic polyether amine having primary amino function and substantially free from free hydroxyl groups, catalysts with tertiary amino groups, carbon dioxide as a carbamate reactive with the polyether amine and optionally other inert gases and conventional polyurea additives. The second component is a polyisocyanate or prepolymer thereof and the third component C is water. The reacting mixture is formed through a throttle gap into the mold to form low-density foamed products under low fuming conditions and has no unreacted diisocyanates.

Abstract: A highly viscous or dough-like material, especially glass fiber-filled polyester, polyamide or polypropylene is fed from a rotating funnel via a feed worm lying along a generatrix of the funnel directly into an extruder or an injection molding cylinder and without passing through an elbow or other jacket. The system is thereby able to operate at reduced pressure with least damage to the fibers and reduced drive energy for the feed worm or screw.

Abstract: A drying apparatus has a generally conical upwardly flared housing having an upper end provided with a cover and a lower end provided with an outlet, a mixing auger mounted on and extending upward from the lower housing end in the housing and rotatable to mix particulate material in the housing, and a magnetron mounted at the upper housing end and directed downward inside the housing to irradiate and heat the particulate material in the housing. The magnetron can be mounted directly on the cover. An adapter ring can be provided on the upper end of the housing between the housing and the cover with the magnetron mounted on this adapter ring. This ring is releasably connected to the cover and housing, and it is possible for the ring to carry a plurality of such magnetrons each provided with a respective coaxial wave guide extending through the ring and into the housing.

Abstract: A synthetic-resin article is molded by plastifying a virgin granulate into a fluent stream and plastifying a recycle granulate into another fluent stream. The recycle stream is then filtered while still plastified to removing particulate impurities from it. Then the filtered recycle stream while still plastified is combined with the virgin stream to form a combined stream and the combined stream is fed into a mold. The stream is mechanically filtered.

Abstract: A process is used to clean a filtering centrifuge. A base layer of filtered matter remains on the filtering medium of the centrifuge after the removal or repeated removal of a portion of a solid cake of filtered matter by a peeling blade and discharge apparatus. The process removes the base layer of solid filtered matter by initially penetrating and flooding the base layer with a liquid and then strongly braking or rapidly accelerating the drum of the filtering centrifuge to rapidly reduce or increase the rotational speed of the drum, respectively.

Abstract: A method is disclosed for operating a valve needle for plastic processing plants. The needle valve may be controlled by a control valve, which in turn is controlled by a working gas volume in order to prevent formation of internal waviness in injection molded articles even under very high gas pressures and to assure high flexibility in production without refitting delays. During plastic mass injection the valve needle seals tightly. During gas return the valve needle remains open until the gas bubble in the mold cavity is completely emptied.

Abstract: An aircraft towing tractor has its acceleration limited to a predetermined limiting acceleration to reduce stresses upon the aircraft undercarriage by a computer-controlled regulator interposed between the gas pedal and the internal combustion engine. The regulator can also provide control of the speed increase of the engine below a predetermined limiting value thereof prior to control of the limiting acceleration.

Abstract: A mold closing apparatus and process for use with an injection molding machine are described. The mold is opened and closed by hydraulic pressure. The disclosed apparatus and method relate to the use of an immobile differential piston within a displaceable, double-acting differential piston which moves within an immobile piston cylinder. This arrangement permits the use of smaller diameters to produce the necessary closing force. The immobile differential piston comprises the necessary hydraulic passages for routing hydraulic fluid to the appropriate surfaces for exerting opening and closing forces.The use of a plurality of displaceable, single-acting pistons in parallel with the differential piston further reduces the diameters needed for exerting the closing force. Locating these single-acting pistons within the support column cylinders makes for an even more compact apparatus.

Abstract: A mixing device exhibiting a mixing chamber, feed and recirculation lines for components and for the component mixture. A control piston reciprocates inside the mixing chamber between a recirculation position where the feed and recirculation lines are in fluid communication and a mixing position where the components impinge and mix in the mixing chamber. At least one component has a straight line recirculation path from its feed to return line through a radial slot in the control piston. A bypass line branches off from at least one feed line and opens into the mixing chamber at a mixing input duct in the same radial plane as a mixing input duct for a second component.

Abstract: An optical disk having a pair of axially oppositely directed faces and an annular outer periphery is made by first forming a mold cavity corresponding to the shape of the disk between a pair of axially spaced parts and a demolding ring sandwiched between the parts. The cavity is then filled with a hardenable resin such that the parts form the respective faces and an inner periphery of the ring forms the outer periphery of the disk and the resin is at least partially hardened in the cavity. The parts are then axially oppositely separated from each other and from the disk to leave the disk in the ring with both of its faces exposed and the ring is then transversely displaced with the disk engaged in it out from between the mold parts. The disk is then cooled and shrunk such that its outer periphery separates from the inner periphery of the ring and the disk separates from the ring.