# US 10,371,435 B2 · Refrigerator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,435 B2 - Document ID: US10371435B2 - Status: Granted - Kind: B2 - Application number: 15/348,795 - Filed: 2016-11-10 - Published: 2017-06-22 - Granted: 2019-08-06 - Earliest claimed: 2015-12-17 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Daekil Kang - Web page: https://patentgrep.com/patent/US10371435B2 ## CPC - F25D 23/025: {Secondary closures} - F25D 11/02: with cooling compartments at different temperatures - F25D 23/028: {Details} - F25D 2323/023: Door in door constructions - F25D 2323/024: Door hinges - F25D: REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR (refrigerated showcases A47F3/04; thermally-insulated vessels for domestic use A47J41/00; refrigerated vehicles, see the appropriate subclasses of classes B60 - B64; containers with thermal insulation in general B65D81/38; heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion C09K5/00; thermally-insulated vessels for liquefied or solidified gases F17C; air-conditioning or air-humidification F24F; refrigeration machines, plants, or systems F25B; cooling of instruments or comparable apparatus without refrigeration G12B) ## Abstract A refrigerator includes a cabinet including a storage compartment provided therein; a first door rotatably coupled to the cabinet to open and close the storage compartment; a second door rotatably coupled to the first door and comprising a stopper; a locking device configured to selectively allow the rotation of the second door with respect to the first door, wherein the locking device includes a moving member having different displacements according to an opening/closing state of the first door; and a hooking member having different displacements according to the displacements of the moving member and selectively hooking the stopper thereto. ## Claims ### Claim 1 A refrigerator comprising: a cabinet with a storage compartment; a first door rotatably coupled to the cabinet, and that is configured to open and close the storage compartment; a second door rotatably coupled to the first door; a hinge that is configured to rotate the second door with respect to the first door, the hinge comprising a hinge shaft that forms a rotation axis of the second door, a hinge bracket coupled to the second door; a stopper that is configured to integrally rotate with the second door; a locking device that is configured to selectively allow the rotation of the second door with respect to the first door, wherein the locking device comprises: a moving member having different displacements according to an opening/closing state of the first door; and a hooking member having different displacements according to the displacements of the moving member and that is configured to selectively hook the stopper to the hooking member, and wherein the rotation axis of the second door extends in a first direction, wherein while the first door is opened or closed, the moving member moves in the first direction. ### Claim 2 (depends on 1) The refrigerator of claim 1, wherein the stopper is hooked to the hooking member to lock the rotation of the second door with respect to the first door. ### Claim 3 (depends on 1) The refrigerator of claim 1, wherein the hinge shaft, the hinge bracket, and the stopper being integrally formed with each other. ### Claim 4 (depends on 3) The refrigerator of claim 3, wherein the stopper is provided in a predetermined portion having a preset radius from the hinge shaft, and the stopper is rotated together with the second door, when the second door is rotated. ### Claim 5 (depends on 3) The refrigerator of claim 3, wherein a hinge accommodating portion is provided inside the first door and accommodates the hinge shaft and the stopper, and the stopper is rotatable within the hinge accommodating portion. ### Claim 6 (depends on 1) The refrigerator of claim 1, wherein the moving member is located in a first position in a state where the first door is closed and in a second position when the first door is open. ### Claim 7 (depends on 6) The refrigerator of claim 6, further comprising: a main-hinge configured to rotate the first door with respect to the cabinet, wherein the locking device is provided in the first door and integrally rotated with the first door. ### Claim 8 (depends on 7) The refrigerator of claim 7, wherein the main-hinge comprises: a main-hinge bracket that is configured to couple the main-hinge to the cabinet; and a horizontal bracket supporting vertical load of the first door. ### Claim 9 (depends on 8) The refrigerator of claim 8, wherein: the moving member is configured to make contact with the horizontal bracket and is located in the first position, in a state in which the first door is closed, and the moving member is configured to release the contact with the horizontal bracket and is moved downward to be located in the second position, in a state in which the first door is open. ### Claim 10 (depends on 9) The refrigerator of claim 9, wherein the moving member has a preset radius from a rotation axis of the first door, and is integrally rotated with the first door with respect to the rotation axis, in a state in which the first door is rotated. ### Claim 11 (depends on 9) The refrigerator of claim 9, wherein the moving member is configured to extend toward the horizontal bracket provided outside the first door from an internal space of the first door. ### Claim 12 (depends on 9) The refrigerator of claim 9, wherein the moving member comprises one end having inclined portions formed in both sides to facilitate relative movement of the moving member with respect to the horizontal bracket. ### Claim 13 (depends on 8) The refrigerator of claim 8, wherein the moving member comprises a plurality of bending portions to compensate a deviation in up, down, right and left locations between the main-hinge and the hinge. ### Claim 14 (depends on 6) The refrigerator of claim 6, wherein when the moving member is located in the first position, the hooking member is located in a unlocking position for unlocking the stopper, and when the moving member is located in the second position, the hooking member is located in a locking position for locking the stopper. ### Claim 15 (depends on 14) The refrigerator of claim 14, wherein when the moving member is moved upward to be located in the first position, the hooking member is moved downward to be located in the unlocking position, and when the moving member is moved downward to be located in the second position, the hooking member is moved downward to be located in the locking position. ### Claim 16 (depends on 15) The refrigerator of claim 15, further comprising: a switchover member that is configured to switch an upward movement of the moving member into a downward movement of the hooking member, and switch a downward movement of the moving member into an upward movement of the hooking member. ### Claim 17 (depends on 16) The refrigerator of claim 16, wherein the switchover member comprises: a central shaft; a first extended portion that is configured to extend to one side from the central shaft and move upward in relation to the upward movement of the moving member; and a second extended portion that is configured to extend to the other side from the central shaft and move upward in the reverse direction of the first extended portion, the hooking member being formed by the second extended portion. ### Claim 18 (depends on 15) The refrigerator of claim 15, further comprising: a flexible member that is configured to elastically deform when the hooking member is moved upward and provide an elastic restoring force when the hooking member is moved downward. ### Claim 19 A refrigerator comprising: a cabinet with a storage compartment; a first door rotatably coupled to the cabinet, and that is configured to open and close the storage compartment; a second door rotatably coupled to the first door via a sub-hinge; a stopper that is configured to integrally rotate with the second door; and a locking device configured to selectively allow the rotation of the second door with respect to the first door, wherein the locking device comprises: a moving member moved to be located in a first position in a state where the first door is closed and to be located in a second position when the first door is open; a hooking member located in a locking position and a unlocking position, in relation to a movement of the moving member, and that is configured to selectively lock the stopper; and wherein the moving member is located in a first position in a state where the first door is closed and in a second position when the first door is opened, wherein while the first door is opened, the moving member moves from the first position to the second position, wherein a height of the first position is different from that of the second position. ### Claim 20 (depends on 19) The refrigerator of claim 19, wherein the height of the first position is greater than that of the second position.