Abstract: The invention relates to the combination of a plasticizing cylinder having a mounting surface with a feed hopper. The cylinder carries two pegs accommodated in corresponding recesses in the hopper. A threaded bolt is provided which is screwed through a portion of the cylinder and engages a surface on the hopper and exerts a force having a component along the mounting surface. The pegs are inclined to the mounting surface so that they exert on the hopper a force having a component towards the mounting surface.

Abstract: A detachable coupling provided between the helix and drive shaft of an injection molding machine is provided by a flattened end of the helix shaft received within a fork-shaped end of the actuation shaft so that respective boreholes are aligned for receiving therethrough a pin. An axially slidable locking sleeve is movable between a position preventing movement of the pin and a position permitting removal of the pin, and a resiliently urged locking detent ball and groove are provided at each of the positions.

Abstract: To be used in operating one or more end switches, one or more cams are mounted on a switchbar, with each cam having two parts with angularly related surfaces that move towards and away from each other by means of a head screw so as to clamp against two correspondingly angled parts of the switchbar, to draw the cam transversely against the side of the switchbar. The switchbar is provided with a V-shaped groove, so as to provide two angled surface portions for respectively engaging two cams mounted respectively on opposite sides of the switchbar, so that the same may be moved past each other in the direction of elongation of the switchbar without interfering with each other.