# US 9,752,270 B2 · Washing machine and method of controlling the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,270 B2 - Document ID: US9752270B2 - Status: Granted - Kind: B2 - Application number: 14/858,532 - Filed: 2015-09-18 - Published: 2016-03-24 - Granted: 2017-09-05 - Earliest claimed: 2014-09-19 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Aekyung Chae; Sangwoo Lee; Youngho Kim - Web page: https://patentgrep.com/patent/US9752270B2 ## CPC - D06F 39/40: Steam generating arrangements - D06F 29/00: Combinations of a washing machine with other separate apparatus in a common frame or the like, e.g. with rinsing apparatus - D06F 57/00: Supporting means, other than simple clothes-lines, for linen or garments to be dried or aired (in combination with means for heating or positive air circulation D06F58/00; adapted to retain the shape of particular articles being dried D06F59/00) - D06F 73/00: Apparatus for smoothing or removing creases from garments or other textile articles by formers, cores, stretchers, or internal frames, with the application of heat or steam (combined with external pressure means D06F71/00) - D06F 73/02: having one or more treatment chambers - D06F 23/04: and rotating or oscillating about a vertical axis - D06F 37/12: adapted for rotation or oscillation about a vertical axis - D06F 39/02: Devices for adding soap or other washing agents - D06F 39/083: {Liquid discharge or recirculation arrangements} - D06F 39/088: {Liquid supply arrangements} - D06F 39/14: Doors or covers; Securing means therefor - D06F: LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES ## Abstract A washing machine and a method of controlling the same, which are capable of easily refreshing laundry, are disclosed. The washing machine includes an outer tub to contain wash water, an inner tub rotatably disposed in the outer tub, a hanger unit, which is disposed over the inner tub and on which laundry is hung, a steam generator disposed at the outer tub to heat the wash water so as to generate steam, and a drive unit rotating the inner tub to rotate the hanger unit and introduces the steam generated from the steam generator into the inner tub. ## Claims ### Claim 1 A washing machine comprising: an outer tub to contain wash water; an inner tub rotatably disposed in the outer tub; a hanger unit disposed over the inner tub on which laundry can be hung; a steam generator disposed at the outer tub to heat the wash water so as to generate steam; a drive unit to rotate the inner tub and in turn the hanger unit, and to introduce the steam generated from the steam generator into the inner tub; and a controller to control the steam generator and the drive unit, wherein the controller is configured to: activate the steam generator to generate steam in the outer tub, and when the outer tub is filled with the steam, halt the operation of the steam generator and then activate the drive unit to rotate the inner tub. ### Claim 2 (depends on 1) The washing machine according to claim 1, wherein the drive unit is configured to rotate the inner tub such that laundry hung on the hanger unit can be spread. ### Claim 3 (depends on 2) The washing machine according to claim 2, wherein the drive unit is configured to repeatedly accelerate and decelerate the inner tub such that the laundry hung on the hanger unit can be repeatedly spread and drooped. ### Claim 4 (depends on 1) The washing machine according to claim 1, further comprising: a balancer disposed at an upper portion of the inner tub to suppress an eccentric rotation of the inner tub, wherein the hanger unit is detachably coupled to the balancer. ### Claim 5 (depends on 1) The washing machine according to claim 1, wherein the hanger unit has an upward-protruding arch shape. ### Claim 6 (depends on 1) The washing machine according to claim 1, wherein the hanger unit includes a bent portion to exert a tensile force such that the hanger unit can be detachably mounted. ### Claim 7 (depends on 1) The washing machine according to claim 1, further comprising: a water supply channel connected to an external water source to supply wash water; and an outer tub cover coupled to an upper portion of the outer tub and comprising a center opening, wherein the outer tub cover includes a wash water guide to introduce the wash water supplied through the water supply channel between a side surface of the outer tub and a side surface of the inner tub. ### Claim 8 (depends on 7) The washing machine according to claim 7, wherein when the wash water is introduced between the side surface of the outer tub and the side surface of the inner tub by the wash water guide, the drive unit rotates the inner tub. ### Claim 9 (depends on 8) The washing machine according to claim 8, wherein when the wash water is introduced between the side surface of the outer tub and the side surface of the inner tub, the drive unit rotates the inner tub at a rotational speed of 10 RPM. ### Claim 10 (depends on 7) The washing machine according to claim 7, wherein the water supply channel further comprises a water supply valve to control a supply of the wash water, wherein the water supply valve controls the wash water to be introduced between the side surface of the outer tub and the side surface of the inner tub. ### Claim 11 (depends on 10) The washing machine according to claim 10, wherein when the amount of wash water supplied through the water supply channel is large, the water supply valve is intermittently opened and closed so as to supply a relatively small amount of wash water. ### Claim 12 (depends on 7) The washing machine according to claim 7, wherein the steam generator receives the wash water which has been introduced between the side surface of the outer tub and the side surface of the inner tub by the wash water guide and heats the wash water to generate steam. ### Claim 13 (depends on 7) The washing machine according to claim 7, wherein when the amount of wash water supplied through the water supply channel is small, the drive unit rotates the inner tub to direct the wash water away from the inner tub and into a wash water introduction hole. ### Claim 14 A method of controlling a washing machine including an outer tub to contain wash water, an inner tub rotatably disposed in the outer tub, and a hanger unit disposed over the inner tub on which laundry can be hung, the method comprising: heating the wash water to generate steam in the outer tub; and rotating the inner tub so as to rotate the hanger unit and introduce the steam into the inner tub, wherein when the outer tub is filled with the steam, the heating of the wash water is stopped and then the inner tub starts to rotate. ### Claim 15 (depends on 14) The method according to claim 14, wherein, in the introducing of the steam, the inner tub is rotated so as to spread the laundry. ### Claim 16 (depends on 14) The method according to claim 14, wherein, in the introducing of the steam, the inner tub is accelerated, then maintained at a predetermined rotational speed, and then decelerated. ### Claim 17 (depends on 16) The method according to claim 16, wherein in the introducing of the steam, the inner tub is accelerated to a speed of 130 RPM, then maintained at a rotational speed of 130 RPM, and then decelerated. ### Claim 18 (depends on 14) The method according to claim 14, further comprising: introducing the wash water between a side surface of the outer tub and a side surface of the inner tub, wherein the heating of the wash water to generate the steam is performed to heat the wash water introduced between the side surface of the outer tub and the side surface of the inner tub so as to generate the steam. ### Claim 19 (depends on 18) The method according to claim 18, wherein the inner tub is rotated during the introducing of the wash water.