公开(公告)号：US12161253B2

公开(公告)日：2024-12-10

申请号：US17201602

申请日：2021-03-15

Applicant: LG Electronics Inc.

Inventor： Wonkyu Lee ,  Jungwon Lee ,  Seoyoun Kim ,  Jongkwan Choi

IPC: A47J31/42 ,  A47J31/00 ,  A47J31/053 ,  A47J31/057

Abstract: A coffee extraction apparatus includes: a first burr grinding supplied whole beans, a first burr through-hole defined in the first burr, a first burr inlet receiving the whole beans, a first burr outlet discharging coffee powder, a second burr inserted into the first burr through-hole through the first burr outlet to define a grinding space for grinding of the whole beans with the first burr, a burr coupler coupled to the second burr to move the second burr, a first rotary part coupled to the first burr to rotate the first burr, a second rotary part connected to the burr coupler and rotating to move the burr coupler in an axial direction of the first burr to adjust a depth of insertion of the second burr into the first burr, an extractor that receives and mixes the coffee powder and water to extract coffee liquid.