Adjustable portafilter and grind adjustment

A portafilter apparatus for an espresso machine, the apparatus comprising:

• a metal head that is attachable to a group head of the espresso machine, wherein the metal head defines a coffee grounds compartment for containing a quantity of ground coffee;
• a perforated movable floor within the metal head, wherein the floor forms a filter and defines the base of the coffee grounds compartment, wherein the floor is vertically movable with respect to the metal head, wherein the perforated floor is supported by a moving floor body;
• a pinion and bevel gear assembly located within the metal head and beneath the moving floor body;
• a handle coupled to the metal head;
• a main shaft that passes through the handle and rotates the pinion and bevel gear assembly;
• a planetary gear assembly driving the pinion and bevel gear assembly, wherein the planetary gear assembly comprises a planetary gearbox located about the free end of the handle, wherein the planetary gearbox terminates the shaft;
• and
• a volume adjustment selector located about the free end of the handle and operatively associated with a planetary gear assembly driving the pinion and bevel gear assembly,
• wherein the moving floor body includes a vertical thread rack that is driven by the pinion and bevel gear assembly to continuously adjust a volume of the coffee grounds compartment, and
• wherein the planetary gearbox connected to the volume adjustment selector such that a rotation of the volume adjustment selector around the handle by a user actuates the planetary gearbox, actuation of the planetary gearbox causes rotation of the main shaft, and rotation of the main shaft causes the perforated floor to raise or lower with respect to the metal head.