Beverage Brewer

A device for brewing of beverages from grounds comprising:

• a lower container assembly having an open top and a closed bottom, the lower container configured to contain unbrewed fluid;
• an upper container assembly, for receiving brewed beverage, having a bottom end releasably connected to the top of the lower container assembly, the bottom end having an opening in communication with said lower container open top;
• a perforated plate mounted proximate said bottom end opening, for preventing movement of grounds from the lower container assembly into the upper container assembly by way of said open top and said bottom end opening;
• a piston-cylinder assembly positioned within the lower container assembly, for receiving grounds, the piston-cylinder assembly comprising
• (a) a cylinder, for slidably receiving a piston, having an upper end and a lower end, said lower end proximate the bottom of the lower container assembly, and said upper end proximate the top of the lower container assembly;
• (b) a piston assembly, positioned within the cylinder and slidable within the cylinder from said lower cylinder end to said upper cylinder end, the piston assembly comprised of:
• (i) a diffuser plate having a multiplicity of through-holes and for pressing on the grounds, the piston to thereby compress the grounds placed within the cylinder between the diffuser plate and the perforated plate;
• (ii) a diffuser fixedly coupled to the diffuser plate defining an expansion chamber therebetween, the diffuser having a substantially conical inner surface spaced from and facing the diffuser plate, the diffuser defining a central orifice at a lower end of the diffuser for providing a fluid pathway for the unbrewed fluid in the lower container to enter the expansion chamber;
• and
• (iii) at least one loose mass disposed in the the expansion chamber, wherein the mass is configured to selectively obstruct the orifice based upon the state of the fluid in the lower container.