Abstract: A piston metering apparatus for the metering of the components of a reaction injection molding machine comprising a metering cylinder (2) the cylinder space of which is surrounded by a cylinder wall, a metering piston (10) sealed in relation to the cylinder wall by means of a sealing unit, a cylinder base (3), component inlet (4) and component outlet lines (5) connected with the metering cylinder (2), and a metering piston (10) coupled with the hydraulic piston rod of a hydraulic drive unit (12). In order to simplify the inspection and maintenance of such a piston metering apparatus, the metering piston (10) is in the form of a plunger piston and the sealing unit is contained in a sealing cartridge (9) releasably fastened to the upper edge of the metering cylinder (2).

Abstract: A mold-handling apparatus in which a pair of mold carriers can be locked together for the molding process but, upon separation, each tilts through 45.degree. to afford improved access to the mold halves following a molding operation or before a molding operation. According to the invention, the upper mold carrier is swung about a fixed axis by a fluid-operated cylinder while another fluid-operated cylinder shifts a slider vertically to lower the pivot of the lower mold carrier and enable the latter to engage abutments which tilt the lower carrier.