Abstract: A method for the production of plastic parts employs a galvano mold arranged in a rotatable housing. The galvano mold is heated to the melting temperature of a plastic by contact with an oil, and thereafter, the housing is reoriented so that the oil is collected underneath the galvano mold, and then it is removed from the housing to cool down the galvano mold. In the housing, the oil is blanketed by an inert gas, such as nitrogen, and the inert gas is introduced with overpressure into the housing, while the oil is simultaneously drawn from the housing into a storage tank having an inert gas atmosphere at a reduced pressure. The oil is heated again, as needed, and returned into the housing for the next production cycle.

Abstract: Disclosed is a process for producing plastic parts, in which, with the aid of a heat-exchange medium, a mold is heated to the melting temperature of the plastic. As a result of rotation of a housing that carries the mold, the heat-exchange medium is brought repeatedly to the rear side of the mold and removed again. The heat-exchange medium used according to the invention is a thermally stable oil bath. The thermally stable oil is led through the feed line into the housing and contacts with the whole area of the rear of the mold. An inert gas blankets the oil in the housing. The oil is moved substantially turbulently as a result of the housing being rotated. The plastic powder is then applied to the mold in a manner known per se.

Abstract: In a method and apparatus for shaping hollow-section workpieces such as tubes of metal, the workpiece is introduced into a pressing mold whose internal contour corresponds to the workpiece shape to be produced. After closure of the pressing mold a pressure medium in the form of solid matter particles or elements such as steel balls is pressed by means of a bar into the workpiece, applying it against the internal contour of the pressure mold. In that operation an upsetting movement of the workpiece is superimposed on the bar movement. The bar can be pressed into the workpiece in two or more steps, in which case the pressure medium is further advanced by means of a pressure cylinder between the respective steps after a respective withdrawal movement of the bar.

Abstract: A mixing apparatus utilizes piston burettes driven by stepping motors as metering pumps to deliver component liquids to be mixed into a liquid stream in a selectable constant mixing ratio. A computer-based automatic control system is used to control the regulated take up of the respective components by the burettes and the delivery of them to a mixing device. The computer calculates the rates of stepping of the respective motors so that each component is delivered over the same period of time and at a respective uniform rate. The computer also controls associated switching valves via an interface device and may be a desk top machine with keyboard or pre-programmed data input.

Abstract: The present magnetic lock is operated by a key including control magnets. For this purpose a locking bar is radially shiftable in a locking cylinder in a housing. Magnetic rotors release or lock the locking bar which is spring biased toward the magnetic rotors. A spring biased control member is shiftable into a locking channel of the locking bar. The control member is equipped with entraining elements which engage the locking bar.

Abstract: An apparatus for the selective delivery of portions of fluid, comprising a plurality of fluid delivery units, each of which includes a respective conveyor for conveying fluid to be delivered. A common drive means for the plurality of delivery units which is selectively connectible to the respective conveyor thereof for selective actuation of the delivery units.

Abstract: A sample preparation device comprising a wet mill having a lower discharge opening for discharging crushed wet material from the mill. A continuous flow centrifuge is arranged at a lower level than the mill. Flow means provide a direct communication between the discharge opening and the centrifuge for the direct transfer of the crushed wet material from the mill into the centrifuge.