Coffee brewing apparatus and method of brewing coffee by the apparatus

A coffee brewing apparatus, comprising:

• (a) a first cylinder for containing a quantity of hot water therein, said first cylinder having a top opening and a bottom opening;
• (b) a vertically movable piston for pressurizing hot water in said first cylinder, said piston being disposed coaxially with said first cylinder and being adapted to sealingly and slidingly fit said first cylinder internally through said top opening thereof;
• (c) a vertically movable second cylinder for holding ground coffee therein, said second cylinder being disposed below said first cylinder coaxially therewith, said second cylinder having a top opening and a bottom opening;
• (d) a vertically movable plunger having a top head and a bottom head, said plunger being disposed coaxially with said first and second cylinders through said bottom opening of said first cylinder in a manner that said top head is fitted in said first cylinder sealingly and slidingly and said bottom head is adapted to be fitted in said second cylinder sealingly and slidingly through said top opening thereof so as to compress ground coffee in said second cylinder when said second cylinder is at an elevated level and hot water in said container is pressurized, said plunger having a hot water exit channel vertically therethrough;
• (e) a pressure-operated hot water release valve disposed in said hot water exit channel which opens when hot water in said first cylinder is pressurized to a predetermined pressure by said piston;
• (f) means for upwardly urging said plunger;
• (g) a vertically movable filter support member disposed below said second cylinder;
• and
• (h) a filter disposed on said filter support member in a manner that said filter is sandwiched between said filter support member and said second cylinder so that said filter covers said bottom opening of said second cylinder when said filter support member is at an elevated level.

A coffee brewing apparatus, comprising:

• (a) a hot water container;
• (b) a ground coffee holder having a bottom opening;
• (c) means for introducing hot water in said container onto ground coffee in said holder;
• and
• (d) a vertically movable, horizontally rotatable filter support block having a plurality of filter support block sections, said filter support block sections being disposed angularly evenly spaced about an rotational center of said filter support block at an even level and a radially equidistance from said rotational center, each of said filter support block sections having a strainer and a coffee outlet under said strainer, each of said filter support block sections being adapted to support a filter thereon in a manner that said filter is sandwiched between said ground coffee holder and said filter support block section.