A method and device for removal of a molded sample from a mold with minimal or no damage to the molded sample. The device includes a drill configured for perforating a wall of the mold with the formation of a through aperture, a shroud passageway through or adjacent the drill, and a passageway from a source for pressurized fluid leading to the shroud passageway. The shroud passageway is configured whereby fluid such as air is applied therethrough simultaneously with perforation operation of the drill. Air directed through the aperture is pressurized and comes into effective contact with the molded sample whereby the molded sample is prevented from being more than minimally contacted with the drill and caused to be removed from the mold.

A method and device for removal of a molded sample from a mold with minimal or no damage to the molded sample. The device includes a drill configured for perforating a wall of the mold with the formation of a through aperture, a shroud passageway through or adjacent the drill, and a passageway from a source for pressurized fluid leading to the shroud passageway. The shroud passageway is configured whereby fluid such as air is applied therethrough simultaneously with perforation operation of the drill. Air directed through the aperture is pressurized and comes into effective contact with the molded sample whereby the molded sample is prevented from being more than minimally contacted with the drill and caused to be removed from the mold.

A device for producing molded concrete blocks includes a mold lower part in which at least one mold cavity is formed and a mold upper part including at least one pressure piece with a lower face facing the mold cavity, an upper face facing away from the mold cavity, and lateral surfaces, wherein the pressure piece has fluid openings on the lower face and/or on the lateral surfaces and is designed to engage into the mold cavity such that when the pressure piece is engaged, a fluid can be introduced into the mold cavity from the fluid openings and/or when the pressure piece is engaged, a fluid can be discharged out of the mold cavity from the fluid openings.