Ice making apparatus for use in a refrigerator

An ice making apparatus comprising a casing accommodating ice trays, an ice receptacle disposed below the ice trays, a retainer for rotatably supporting the ice trays, the retainer including a plurality of bearings for receiving a plurality of driven gears, and one or more than one knob for respectively twisting the ice trays simultaneously or singly, wherein the ice making apparatus has a single twist mode and a simultaneous twist mode,

• wherein in the single twist mode where each ice tray is twisted independently from remaining ice trays, the retainer is coupled to a first exchangeable cover which has a plurality of bearings, each bearing corresponding to a bearing of the retainer and holding a plurality of knobs, one knob for singly twisting a corresponding ice tray, each ice tray has a head and each knob has a hub which directly and detachably engages with the head of the corresponding ice tray,
• wherein in the simultaneous twist mode where all ice trays are twisted simultaneously, the retainer is coupled to a second exchangeable cover which has a gear assembly and only one bearing holding only one knob for simultaneously twisting all ice trays via the gear assembly which couples the ice trays with the only one knob of the second exchangeable cover, the gear assembly has a driving gear coupled to the plurality of driven gears, the driving gear has a head which directly and detachably engages with the hub of the only one knob and each driven gear has a hub which directly and detachably engage with the head of the corresponding ice tray
• wherein the first exchangeable cover and the second exchangeable cover are interchangeable such that the ice making apparatus is convertible between the single twist mode and the simultaneous twist mode by the retainer selectively coupling to the first exchangeable cover and the second exchangeable cover, respectively.