the present invention refers to an ice making device that is designed to be detachably mounted inside the inner case or liner of the freezing compartment of a domestic refrigerator . more particularly , it refers to an ice making device similar to those having a detachable tank to hold the water that will later be used to fill the ice making tray . as shown in fig1 to 12 , the ice making device ( 1 ) is comprised of a series of main elements coupled to each other and that interact effectively to perform the function of the same , as it is explained below . initially , the device has a main case structure ( 10 ) which , preferably , has a substantially parallelepiped shape and acts as main support structure for the ice making device ( 1 ). said main case structure ( 10 ) can be made of any adequate rigid polymeric material , such as polycarbonate , polyethylene , polystyrene , etc . moreover , it has a hinged door ( 11 ) coupled at the front to allow or block access to the inside of the case ( 10 ), and it has a latch or lock media ( 12 ) for fastening . as it can be better observed in fig1 , a first lateral case cover ( 13 ) and a second lateral case cover ( 14 ) are coupled to the sides of the case structure ( 10 ) for the purpose of tightness and design . in a preferred embodiment , said hinged door ( 11 ) has at least one opening ( 15 ) on it to favor air circulation inside the case ( 10 ) and , therefore , in the ice making tray ( 20 ); moreover , various openings can be conveniently made in different sections of the case ( 10 ) with the same purpose . an ice making tray ( 20 ) is detachably disposed inside said case structure ( 10 ) so that it can be rotated in a predetermined angle , preferably between 140 and 160 degrees to facilitate the dispensing of ice cubes from it . said tray ( 20 ) is preferably made up of an adequate semi - rigid polymeric material which allows additional torsion of the tray preferably in an angle between 20 and 30 degrees to facilitate even more the release of the ice cubes formed in it ; additionally , it has at least one opening ( 21 ) on it to prevent overfilling . furthermore , as it is shown in fig1 , the ice making tray ( 20 ) has a portion of the central rotating shaft ( 22 ) and a decentralized cam follower element ( 23 ) symmetrically and integrally formed on both ends ; by means of these elements , one end is assembled to a lateral of the case ( 10 ) and the other end is assembled to a drive transmission mechanism ( 30 ). as it is shown particularly in fig1 , the assembly at the end of the tray ( 20 ) on the lateral of the case ( 10 ) is done by inserting both the central shaft portion ( 22 ) and the decentralized cam follower element ( 23 ) on a guiding channel ( 16 ) formed on said lateral of the case , so that the central shaft portion ( 22 ) abuts against the back of said guiding channel ( 16 ) whereby it is separately retained inside a semi - cylinder ( 17 ) for rotation ; while the decentralized cam follower ( 23 ) remains in a position such that when the tray ( 20 ) is rotated , it covers a second guiding channel ( 18 ) formed on the lateral portion of the case ( 10 ) which has a semicircular path and serves to guide and stop the rotation of the tray ( 20 ) in the predetermined angle . it should be noted that the tray ( 20 ) is made symmetrically so that it can work properly regardless of the side on which it is arranged on the case ( 10 ). as it is shown in detail in fig1 , the end of the tray ( 20 ) that is assembled to the drive transmission mechanism ( 30 ) is made by inserting both the central shaft portion ( 22 ) and the decentralized cam follower element ( 23 ) of the end of the tray ( 20 ), inside a u - shaped channel ( 34 ) specially formed at the back portion of a second gear element ( 33 ) of said drive transmission mechanism ( 30 ), which is rotably coupled on the other lateral portion of the case ( 10 ). said drive transmission mechanism ( 30 ) allows the user to rotate the ice making tray ( 20 ) on a predetermined angle by means of a lever ( 31 ) ( and if necessary , make an additional torsion twist to the same ), in order to release the ice cubes formed in the tray . this drive transmission mechanism ( 30 ) is preferably coupled to a lateral portion of the case , and is made up of a manually actuated lever ( 31 ) pivotally coupled from one of its ends to the case structure ( 10 ); said lever ( 31 ) has a first gear element ( 32 ) integrally formed on said end of the lever coupled to the case ( 10 ). said drive transmission mechanism ( 30 ) also comprises a second gear element ( 33 ) coupled on one side to the said first gear element ( 32 ) in a serrated way , and on another side to said ice making tray ( 20 ) through a u - shaped channel ( 34 ) specially formed on the back portion . furthermore , said drive transmission mechanism ( 30 ) has a torsion spring ( 35 ) which exerts a push counterforce to return the mechanism to its initial position ; said torsion spring ( 35 ) is preferably coupled to said second gear element ( 33 ); however , in an alternative embodiment , it can be coupled directly onto the lever ( 31 ). moreover , an ice cube container ( 40 ) is mounted in a sliding and detachable manner at the bottom portion of the case structure ( 10 ). said container ( 40 ) is specially designed to receive and store the ice cubes formed in the ice making tray ( 20 ) once they are released from the tray when rotated through the drive transmission mechanism ( 30 ). the container ( 40 ) has a handle ( 41 ) to facilitate its removal and , in a preferred embodiment , it can have tracks or rails to facilitate sliding it in the case ( 10 ), as well as stoppers to hold it in a fixed desired position . in another preferred embodiment , said container can be designed to store approximately 1 kg of ice cubes . similarly , a detachable tank ( 50 ) is mounted in a sliding and removable manner to the upper portion of said case structure ( 10 ); said detachable tank ( 50 ) is specially used to hold water and , once mounted in its place in said case structure ( 10 ), to automatically supply water directly into the ice making tray ( 20 ). as fig2 to 26 show , the detachable tank ( 50 ) comprises a tray element ( 51 ) and a cover element ( 52 ) engaged to each other by means of clamping elements ( 53 ), preferably snap - on type such as flanges , clips , bolts or any other adequate element ; providing a container space between them . a gasket or elastic o - ring seal ( 54 ) is arranged between both elements ( 51 , 52 ) to ensure a tight seal between them . on the upper part of the cover element ( 52 ) there is a fill opening ( 55 ) through which the detachable tank ( 50 ) can be filled ; said fill opening ( 55 ) can be closed by a cap ( 56 ) hold preferably in a hinged way to said cover ( 52 ). at the bottom portion of the tray element ( 51 ) there is a drain opening ( 57 ) through which the water is directly supplied to the ice making tray ( 20 ). said water supplied through the drain opening ( 57 ) is controlled by a plug valve ( 60 ) coupled in a hinged way to the bottom portion of the tray element ( 51 ) of the detachable tank ( 50 ). as it can be observed in detail in fig2 to 29 , the plug valve ( 60 ) comprises of a cross shaft ( 61 ) rotably coupled to a pair of brackets integrally formed on the tray element ( 51 ); an angular bent arm ( 62 ) with a first end perpendicularly joined to said rotating shaft ( 61 ); and a resilient plug element ( 63 ) coupled to a second end of say angular bent arm ( 62 ), said resilient plug element ( 63 ) is specially designed to seal the passage of fluid through the drain opening ( 57 ) due to the force exerted on the valve ( 60 ) by a torsion spring ( 64 ) attached to the said rotating shaft ( 61 ). furthermore , there is a cam follower - type flange ( 65 ), integrally formed on a portion of the angular bent arm ( 62 ) that , once the detachable tank ( 50 ) is fully assembled to the case structure ( 10 ), comes in contact with a cam - type protrusion ( 19 ) formed in said case ( 10 ), causing the force exerted by the torsion spring ( 64 ) of the valve ( 60 ) to be overcome when said valve ( 60 ) is pushed upwards to the open position . together with the previous statements , the drain opening ( 57 ) of the tank comprises a tubular element ( 58 ) that extends downwards and has an angular cut on its final end , said tubular element ( 58 ) is used to guide the discharge of water from the tank ( 50 ) to the tray ( 20 ) in only one direction , thus preventing water spread outside the tray . said tubular element ( 58 ) has at least one channel - type groove or recess ( 59 ) longitudinally formed along the inner surface of it , in order to prevent small quantities of water waste to be stuck in said tubular element due to the capillary effects and eventually prevent the water waste to freeze causing seal problems between the drain opening ( 57 ) and the plug valve ( 60 ). additionally , as it can be specially noted in fig2 and 29 , said plug valve ( 60 ) has at least one water diversion flap ( 66 ) preferably arranged on the angular bent arm ( 62 ) of it to prevent any residual water discharged from the drain opening ( 57 ) to reach the torsion spring ( 64 ) and come in contact with the same , and causing said spring ( 64 ) to freeze , consequently producing a malfunction . in a preferred embodiment of this invention , a pair of diversion flaps ( 66 ) is arranged in a tab style around the angular bent arm ( 62 ) of the valve ( 60 ), in an area near the discharge of the drain opening ( 57 ). nonetheless , it is important to point out that the detachable tank ( 50 ) can be mounted in a sliding manner to the case structure ( 10 ), preferably through matching coupling rails or pads ( 67 ) formed on both sides , as well as snap - on clamping elements ( 68 ) such as deformable flanges , clips , or any other adequate media . lastly , as it can be observed in fig3 and 5 , the ice making device comprises means specially designed so that it can be mounted in a detachable way to the inner cover or liner of a domestic refrigerator . specifically , at the rear portion of case structure ( 10 ) there is at least one assembling grommet ( 70 ) designed to receive and hold the bolt head ( not illustrated ) formed on said refrigerator liner . moreover , on a side of said case ( 10 ) there is at least one groove ( 71 ) designed to receive the protrusion ( not illustrated ) also formed on the refrigerator liner . modifications to the structure described in the present invention , can be made by those skilled in the art . thus , it should be noted that the present description refers to the preferred embodiments of this invention , which are for illustrative purposes only , and should not be understood as a limitation of the invention . all modifications made without departing from the spirit of the invention , such as adapting two or more ice making trays on the device , adapting additional tanks or tank divisions , etc . should be considered within the scope of the appended claims .