The mould consists of four pieces: two violet fixed ones, green and yellow movable ones. The green and yellow pieces must go apart from each other for removing the undercut workpiece (not shown).
Only one cylinder controls their motions (instead of two in ordinary concept) thanks to its floating fitting.
The cylinder body and the green piece are fixed to blue frame that can translate in the base.
Yellow piston is fixed to the yellow piece.
When the piston moves out off the cylinder, the yellow and green pieces come into contact with the violet ones, the mould is closed.
When the piston moves in, the yellow and green pieces come into contact with red screws of the base, the mould is opened. Stroke length of each movable mould piece cand be set by red screw.
The two violet pieces can become movable by the same way to create four movable piece mould.