Abstract: The invention relates to a method for the continuous manufacture of longitudinally slit foam pipes using an internal core and two outer mould portions, externally and spacedly surrounding the core, whereby the two outer mould portions are displaced in movement-conforming manner along a path with the formation of a continuous, annular channel open towards a core support and whereby further a sheet is curved in tubular or U-shaped manner, and just before entering the annular channel is supplied with a foam base material which is completely foamed in the annular channel, whereby the foamed hollow profile is formed.

Abstract: The invention relates to a mould carrier with a lower platen and an upper platen which can be pivoted with respect to the lower platen through 90.degree. upwards, for receiving the mould halves of, more particularly, polyurethane foam moulds, with an actuating member, which can be moved linearly for opening and closing the mould carrier, and with a two-armed main lever, whose one arm is connected via a toggle lever in an articulated manner with the actuating member, and whose other arm engages the upper platen, in the case of which the toggle lever in the closed position of the mould carrier is perpendicular to the direction of movement of the actuating member for dead-center locking.

Abstract: The specification describes a high pressure mixing head for producing a chemically reactive mixture for producing foam articles. An expulsion piston adapted to move in a mixing chamber with inlet ports for the reactive mixture components and with an outlet port is driven by a drive piston. In order to achieve a higher velocity of the expulsion piston in the vicinity of the inlet ports the drive piston is constructed in two parts, an inner piston part and an outer annular piston part adapted to slide on the inner piston part. At the end of the stroke the outer piston part is arrested and the inner piston part continues to move at a higher velocity, a projection at the end of the drive piston moving into a recess. At the beginning of the stroke in the other direction the projection is moved out of the recess by a pressure medium at a high speed until the projection has cleared the recess.

Abstract: A system is disclosed for a plural component plastics reaction injection molding machine which provides continuous supply and recycling of each of a plurality of liquid components between a mixing head and separate supply tanks for the respective liquid components. The system is designed to use a portion of the respective recycle conduits of the several components as supply conduits to the head, in parallel with the normal supply conduit to the head, during periods of reaction injection taking place in the mixing head, whereby to permit the employment of smaller diameter conduits in the aforesaid portions of the system without reducing the capacity of the molding system. Further economy is achieved by design of the aforesaid portions of the conduit systems to dispose either the supply or recycle conduit concentrically within the other.

Abstract: The invention relates to a method and an apparatus for the continuous manufacture of longitudinally slit foam pipes using an internal core and two outer mold portions, externally and spacedly surrounding the core, whereby the two outer mold portions are displaced in movement-conforming manner along a path with the formation of a continuous, annular channel open towards a core support and whereby further a sheet is curved in tubular or U-shaped manner, and just before entering the annular channel is supplied with a foam base material which is completely foamed in the annular channel, whereby the foamed hollow profile is formed.