DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

[0042] Reference will now be made in detail to the preferred embodiment(s) of the present invention, examples of which are illustrated in the accompanying drawings. Throughout the drawings, like elements are indicated using the same or similar reference designations where possible.

[0043] FIG. 3 is a perspective view of a dishwasher according to the present invention.

[0044] Referring to FIG. 3, a dishwasher according to the present invention mainly includes a cabinet 54 having a large open front side, a washing chamber 52 provided in the cabinet 54 , and a door 56 opening closing the open front side of the cabinet 54 .

[0045] Upper and lower racks 60 and 62 on which tableware is put are provided in the washing chamber 52 , and top and bottom nozzles 64 and 66 injecting water via injection holes are rotatably provided under the upper and lower racks 60 and 62 , respectively. Each of the upper and lower racks 60 and 62 is constructed with a multitude of wires crossing to be connected to each other to hold the tableware thereon.

[0046] A sump (not shown in the drawing) is provided under the washing chamber 52 to collect water therein. A pump (not shown in the drawing) pumping water to the top and bottom nozzles 64 and 66 and a heater assembly (not shown in the drawing) for heating water held in the sump are provided in the sump.

[0047] Moreover, a blower assembly 56 a for bowing out humid air in the dishwasher in progress and a detergent box assembly 56 b storing a detergent re provided to an inside of the door 56 . And, a gasket (not shown in the drawing) is provided to an inner circumference of the door 56 to make the door 56 adhere closely to cabinet 54 when the door 56 is closed.

[0048] Meanwhile, the upper and lower racks 60 and 62 are provided to move back and forth in the washing chamber 52 . Specifically, wheels 62 a are attached to a bottom of the lower rack 62 so that the lower rack 62 can be drawn outside the washing chamber 52 when the door 56 is fully open.

[0049] A plurality of first and second guide rollers 68 a and 68 b are provided to both sidewalls of the washing chamber 52 , and a guide rail 69 is provided between of the first and second guide rollers 68 a and 68 b to slide back and forth.

[0050] Moreover, a height adjustment means 70 is provided to the upper rack 60 . The height adjustment means 70 is provided to slide in the guide rail 69 to move the upper rack 60 upward and downward.

[0051] Of course, the height adjustment means 70 can be provided to the lower rack 62 or to both of the upper and lower racks 60 and 62 . For the convenience of describing the dishwasher according to the present invention, the height adjustment means 70 is provided to the upper rack 60 only.

[0052] FIG. 4 is a cross-sectional view of a rack assembly of a dishwasher according to the present invention, FIG. 5 is a front view of a height adjustment means according to the present invention, and FIG. 6 is a rear view of a height adjustment means according to the present invention.

[0053] Referring to FIG. 4 to FIG. 6 , the height adjustment means 70 includes a guide panel 74 , a supporter 72 , and first and second support parts 77 and 78 .

[0054] The guide panel 74 is coupled to the guide rail 69 to slide in. For this, rollers 76 inserted to slide in a slot 69 a (cf. FIG. 3 ) are provided to both sides of the guide panel 74 . Moreover, the guide panel 74 is installed to enclose the supporter 72 to guide upward/downward movement of the supporter 72 .

[0055] The supporter 72 is coupled to the upper rack 60 to fix thereto. For this, a plurality of hooks 72 a fixing upper lateral wires of the upper rack 60 thereto and a plurality of protrusions 72 b fixing a lower lateral wire thereto are provided to the supporter 72 .

[0056] FIG. 7 is a magnified view of ‘A’ in FIG. 6 .

[0057] The protrusion 72 b, as shown in FIG. 7 , has a hook shape and is supported by a rib 73 extending from the supporter 72 . The rib 73 preferably extends to a top end of the protrusion 72 b to reinforce a rigidity of the protrusion 72 b.

[0058] And, the first and second support parts 77 and 78 are formed at the support 72 and the guide panel 74 , respectively to fix the supporter 72 to a predetermined spot of the guide panel 74 .

[0059] FIG. 8 is a cross-sectional according to a bisecting line A-A in FIG. 5 , in which the first and second support parts 77 a and 78 are shown in detail.

[0060] The first support part 77 , as shown in FIG. 8 , includes a first fixing portion 77 a formed to be stepped at one upper side of the supporter 72 and a second fixing portion 77 b protruding from a top end of the guide panel 74 .

[0061] When the supporter 72 moves downward, the first fixing portion 77 a is caught on the second fixing portion 77 b so that the supporter 72 is unable to further move downward. Hence, the supporter 72 moves downward for a while and then stops at a predetermined height if the first fixing portion 77 a is caught on the second fixing portion 77 b.

[0062] And, the second support part 78 includes a first incline portion 78 a having an upward incline plane at the guide panel 74 and a second incline portion 78 b having a downward incline plane at one side of the supporter 72 .

[0063] When the supporter 72 moves upward, the second incline portion 78 b is brought sliding contact with the inline plane of the first incline portion 78 a and is then positioned over the first incline portion 78 a (cf. FIG. 10D ).

[0064] Hence, the second incline portion 78 b is caught on the first incline portion 78 a to prevent the supporter 72 from moving downward again. Thus, the supporter 72 moves to upward to a predetermined height to stop until the second incline portion 78 b is disposed onto the first incline portion 78 a.

[0065] Besides, the first and second support parts 77 and 78 are explained in detail when an operation of the dishwasher is described as follows.

[0066] FIG. 9 is a cross-sectional according to a bisecting line B-B in FIG. 5 .

[0067] Referring to FIG. 9, a stopper 79 is formed at the supporter 72 and the guide panel 74 so that the supporter 72 moving upward cannot further move upward when the second incline portion 78 b is caught on the first incline portion 78 a.

[0068] The stopper 79 includes a first hook 79 a formed at the guide panel 74 and a second hook 79 b formed at the supporter 72 . The first and second hooks 79 a and 79 b are locked to each other so that the supporter 72 is unable to move upward any more.

[0069] Meanwhile, the height adjustment means 70 further includes a button 80 installed at the guide panel 74 to release the lock between the first and second incline portions 78 a and 78 b.

[0070] The button 80 , as shown in FIG. 5 and FIG. 8 , is inserted in a hole 77 h formed at a center of the second fixing portion 77 b to be contacted with the supporter 72 or to leave a predetermined interval from the supporter 72 .

[0071] Hence, if a user presses the button 80 , the button 8 pushes a portion of the supporter 72 where the second incline portion 78 b is formed so that the first and second inline portions 78 a and 78 b are unlocked.

[0072] In this case, the supporter 72 is preferably formed of an elastic material to be elastically compressed by the button 80 and to be restored. Specifically, the supporter 72 is formed of a plastic based material. Moreover, the guide panel 74 is preferably formed of an elastic material as well.

[0073] An operation of the above-constructed dishwasher is explained as follows.

[0074] FIGS. 10A to 10 F are diagrams of a height adjustment means of a dishwasher according to the present invention, in which operation states of the height adjustment means are shown.

[0075] First of all, the upper lateral wires of the upper rack 60 are inserted to be fixed between a plurality of the hooks 72 a formed on a rear side of the supporter 72 , and the lower lateral wire of the upper rack 60 is inserted to be fixed to the protrusions 72 b at the lower rear side of the supporter 72 .

[0076] And, the guide rail 69 is installed to slide between the first and second guide rollers 68 a and 68 b fixed to both sides of the washing chamber 52 , and the roller 76 fixed to the guide panel 74 is inserted in the slot 69 a of the guide rail 69 .

[0077] Once the upper rack 60 is installed inside the washing chamber 52 , the weight of the upper rack 60 makes the supporter 72 move downward by gravity. In this case, the fixing portion 77 a at the supporter 72 , as shown in FIG. 10 A, is caught on the second fixing portion 77 b at the guide panel 74 so that the supporter 72 is unable to further move downward.

[0078] The supporter 72 , as shown in FIG. 10 B, is caught on the upper part of the guide panel 74 to stop moving, and the upper rack 60 fixed to the supporter 72 descends together with the supporter 72 to a predetermined height to stop. Hence, a position of the upper rack 60 is lowered.

[0079] Moreover, the first and second hooks 79 a and 79 b of the first stopper 79 , as shown in FIG. 10C maintains to leave a predetermined distance from each other.

[0080] Subsequently, when a user lifts the upper rack 60 upward, both of the upper rack 60 and the supporter 72 move upward so that the second incline portion 78 b slides to be brought contact with the incline plane of the first incline portion 78 a. The second incline portion 78 b is then disposed over the first incline portion 78 a.

[0081] In this case, even if the supporter 72 is pushed downward by the weight of the upper rack 60 , the second incline portion 78 b of the supporter 72 is caught on the first incline portion 78 a of the guide panel 74 so that the support 72 is unable to further move downward.

[0082] The supporter 72 , as shown in FIG. 10 E, is held by the lower side of the guide panel 74 to stop moving, and the upper rack fixed to the supporter 72 ascends together with the supporter 72 to a predetermined height to stop. Hence, the position of the upper rack 60 is raised.

[0083] Moreover, when the second incline portion 78 b is caught on the first incline portion 78 a as the supporter 72 ascends over the predetermined height, the second hook 79 b of the supporter 72 , as shown in FIG. 10 B, is locked to the first hook 79 a of the guide panel 74 so that the supporter 72 I unable to further move upward.

[0084] Meanwhile, once the user presses the button 80 while the second incline portion 78 b is caught on the first incline portion 78 a, the button 80 pushes the supporter 72 to widen the gap between the supporter 72 and the guide panel 74 so that the second and first incline portions 78 b and 78 a are released from each other.

[0085] In this case, as the first incline portion 78 a of the guide panel 74 slides to be brought contact with the incline plane of the second incline portion 78 b of the supporter 72 so that the supporter 72 moves downward.

[0086] Thereafter, as explained in the foregoing description, the first fixing portion 77 a of the supporter 72 is caught on the second fixing portion 77 b of the guide panel 74 , whereby the position of the upper rack 60 is lowered.

[0087] Accordingly, the dishwasher according to the present invention has the following advantages or effects.

[0088] First of all, the rack is moved upward and downward by the height adjustment means, thereby causing no inconvenience of loading/unloading the rack on/from the guide rail to adjust the installation position.

[0089] Secondly, the button pressed by the user enables the rack to lie on a relatively low position. And, the rack is lifted by the user to lie on a relatively high position. Thus, the installation height of the rack is conveniently adjusted. Therefore, the present invention facilitates to simply adjust the installation height of the rack with less effort.

[0090] It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover such modifications and variations, provided they come within the scope of the appended claims and their equivalents.