Abstract: A Machine for preparing coffee comprising a infusion chamber to house at least a coffee dose, and means for feeding pressurized water to said infusion chamber, said means comprising a cylinder and plunger assembly, said plunger defining inside the cylinder a chamber to house a preset quantity of water, and said plunger being able to accumulate, in an active position, potential energy capable of being transmitted as a pressure to the water of said chamber, when said plunger contacts, in said active position, with the water of said chamber. It is characterized in that said infusion chamber is placed adjacent below the water chamber of said cylinder, both chambers including at least one hole through which, once opened, passes the pressurized water to said infusion chamber, said plunger moving back to the rest position inside said chamber as pressurized water is fed through said hole.

Abstract: A Machine for preparing coffee comprising a infusion chamber to house at least a coffee dose, and means for feeding pressurized water to said infusion chamber, said means comprising a cylinder and plunger assembly, said plunger defining inside the cylinder a chamber to house a preset quantity of water, and said plunger being able to accumulate, in an active position, potential energy capable of being transmitted as a pressure to the water of said chamber, when said plunger contacts, in said active position, with the water of said chamber. It is characterized in that said infusion chamber is placed adjacent below the water chamber of said cylinder, both chambers including at least one hole through which, once opened, passes the pressurized water to said infusion chamber, said plunger moving back to the rest position inside said chamber as pressurized water is fed through said hole.