US 12,303,060 B2
Coffee extraction apparatus
Wonkyu Lee, Seoul (KR); Jungwon Lee, Seoul (KR); Seoyoun Kim, Seoul (KR); and Jongkwan Choi, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on Mar. 15, 2021, as Appl. No. 17/201,740.
Claims priority of application No. 10-2020-0039881 (KR), filed on Apr. 1, 2020.
Prior Publication US 2021/0307557 A1, Oct. 7, 2021
Int. Cl. A47J 31/42 (2006.01); A47J 42/40 (2006.01); A47J 42/50 (2006.01); A47J 42/22 (2006.01)
CPC A47J 31/42 (2013.01) [A47J 42/40 (2013.01); A47J 42/50 (2013.01); A47J 42/22 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A coffee extraction apparatus comprising:
a first grinder comprising:
a first burr configured to rotate,
a first burr through-hole defined in the first burr in an axial direction of the first burr,
a first burr inlet disposed at a first end of the first burr through-hole to allow whole beans to be introduced thereinto,
a first burr outlet disposed at a second end of the first burr through-hole opposite to the first end of the first burr through-hole to discharge coffee powder, and
a first rotary part coupled to an outer surface of the first burr and configured to rotate the first burr;
a second grinder comprising:
a second burr inserted into the first burr through-hole through the first burr outlet to define a grinding space for grinding the whole beans with the first burr,
a burr coupler that supports the second burr and that is configured to couple to the second burr and move the second burr in the axial direction of the first burr, and
a second rotary part that is connected to the burr coupler and a second gear part, the second gear part being configured to be rotated by a second power part;
a first driving unit disposed at an outside of the first grinder and configured to generate rotational force;
a second driving unit configured to rotate the second rotary part;
a grinder fixing part coupled to the first driving unit and defining a space configured to receive the first grinder, the first grinder being configured to receive the rotational force from the first driving unit;
an extractor that defines an opening on a first side facing the first burr outlet to receive the coffee powder discharged through the first burr outlet and that is configured to mix the coffee powder with water to extract coffee liquid; and
a water supplier configured to supply water to the extractor,
wherein the first grinder is configured to be selectively separated from the grinder fixing part,
wherein the second grinder is configured to be selectively separated from the first grinder,
wherein the second rotary part comprises:
a rotating ring rotatably connected to the second gear part, and
a cylindrical guide that passes through the rotating ring and that is coupled to the burr coupler, and
wherein the cylindrical guide is configured to, based on the rotating ring being rotated, move in the axial direction of the first burr to thereby (i) move the burr coupler in the axial direction of the first burr and (ii) adjust a depth of insertion of the second burr into the first burr.