Abstract: A coupling has face gears for transmitting torque or transverse forces between a first part provided with a first face gear and a second part provided with a second face gear complementary to the first face gear. At least one of the parts is a shaft, an axle, a pin or a flange, and it is possible to bring the first face gear into form-fitting engagement with the second face gear. At least one of the face gears has at least one groove having a constant width and a longitudinal centerline forming a semicircular arc having a respective first center of curvature in at least one section of the groove and, in at least one other section of the groove, forming another semicircular arc having a respective second center of curvature.

Abstract: The invention relates to a coupling having spur gearing for transmitting torques and/or transverse forces between a first part (4), which is provided with first spur gearing (1, 1a), and a second part (5), which is provided with second spur gearing (1, 1b) so as to be complementary to the first spur gearing (1, 1a). At least one of the parts is in particular a shaft, an axle, a pin or a flange, and it is possible to bring the first spur gearing into form-fitting engagement with the second spur gearing. The invention is characterized in that at least one of the spur gearing systems comprises at least one groove (39) of constant width (B), wherein the longitudinal center line of the groove forms a circular arc (41) having a first center (M1) in at least one section of the groove and, in at least one other section of the groove, forms a circular arc having at least one second center (M2).

Abstract: A foaming agent charging and mixing device comprises at least one mixing device and one foaming agent metering device, wherein the foaming agent charging and mixing device may be arranged between an plasticating screw and a mold. In order to improve the foaming agent charging and mixing device in a manner that the mixing with foaming agent is facilitated and at the same time a risk of obstruction of the foaming agent metering device is avoided, the foaming agent metering device is alternately opened and closed through the mixing device during operation thereof for supplying foaming agent to the plastic melting.

Abstract: An injection unit for an injection molding machine includes an injection device in the form of a plunger/screw, which is driven axially and rotationally in a housing, and a device intended for mixing and metering plastic melt and including an inlet for introduction of an additive. A spacer element is disposed between a backflow prevention assembly of the screw and the plunger, with the spacer element having a length, which corresponds at least to the stroke of the injection device. The spacer element has a first flow channel for establishing in each position a fluidic connection with a second flow channel which initially extends radially in an outward direction and then parallel to the movement and guide area of the plunger to an area between a nozzle and the plunger. The second flow channel extends through the mixing and metering device arranged adjacent to a movement and guide area of the plunger.

Abstract: A foaming agent charging and mixing device comprises at least one mixing means and one foaming agent metering means, wherein the foaming agent charging and mixing device may be arranged between an plasticating screw and a mold.