Abstract: A device for adjusting the intake air temperature of carburetor-equipped internal combustion engines having an air intake system with a flapper valve in a duct junction admitting cold raw air and/or preheated raw air to the intake filter, depending on the raw air temperatures, the flapper valve position being controlled by a pneumatic membrane actuator receiving negative pressure from the intake manifold, via a vacuum line with a thermostat-controlled relief valve responsive to the temperature of the air mixture. In the drive connection between the membrane actuator and the flapper is arranged a wax thermostat which increases or decreases the effective length of the connection in response to the ambient air temperature, thereby adding the thermostat displacements to the actuator displacements.

Abstract: A self-interrupting gravity feed device for a plastic raw materials mixer comprising a vertical flow tube which reaches from above into the mixer receptacle, and a horizontal baffle arranged at a distance from the lower opening of the flow tube. The baffle is similar in shape and at least as large in diameter as the flow tube opening and it is preferably vertically adjustable in relation to the flow tube.

Abstract: A device for the metering of plastic raw materials of granulate, or pulverulent, or highly viscous consistency in connection with plastic materials processing machines, where a rotating metering disc at the bottom of a drum-shaped receptacle discharges fixed amounts of material at a predetermined frequency, and where the semi-circular metering pockets on the periphery of the metering disc are wiped clean by a vertically extending radially and circumferentially flexible wiper finger which dislodges any material that might otherwise adhere to the pocket flanks at the point of gravity discharge of the plastic material from the metering pockets.