Coffee brewing apparatus

Abstract

A coffee brewing apparatus has a first cylinder for containing hot water having a top opening, a vertically extending shaft fixedly connected to the first cylinder, the shaft having a hot water release channel vertically therethrough and a pressure-operated hot water release valve disposed in the channel, a vertically movable piston, a vertically movable second cylinder for holding ground coffee therein having top and bottom openings and disposed below the first cylinder coaxially therewith, and a vertically movable plunger sealingly and slidingly connected with the shaft. The plunger has an internal cylindrical chamber and a shallow hot water spreading chamber in a bottom section thereof. When the plunger is lowered, the bottom section thereof enters the second cylinder and compacts the ground coffee therein. As the piston enters the first cylinder through the top opening thereof and further descends, the hot water in the first cylinder is pressurized so that the hot water release valve opens and pressurized hot water in the first cylinder is released through the hot water release channel in the shaft, the cylindrical chamber and the hot water spreading chamber of the plunger to be poured onto the ground coffee in the second cylinder.