Dishwasher

Abstract

The present disclosure provides a dishwasher having an improved basket pull-out structure. The dishwasher includes: a tub; a basket arranged inside the tub for loading dishes; and a draw-out unit arranged on either side of the basket for guiding the basket to be drawn out forward from the tub, wherein the draw-out unit includes first, second, and third rails, a plurality of first balls placed between the first and second rails, and a plurality of second balls placed between the second and third rails, and wherein the plurality of first balls and the plurality of second balls are arranged in vertical direction. According to the present disclosure, a slim draw-out unit may be provided by aligning ball bearings in vertical direction, thereby increasing the space utility of the dishwasher.

What is claimed is: 
     
         1 . A dishwasher comprising:
 a tub;   a basket arranged inside the tub to load dishes; and   a draw-out unit arranged on a side of the basket to guide the basket to be drawn out forward from the tub,   wherein the draw-out unit includes first, second, and third rails, a plurality of first balls placed between the first and second rails, and a plurality of second balls placed between the second and third rails, and   wherein the plurality of first balls and the plurality of second balls are arranged in a vertical direction.   
     
     
         2 . The dishwasher of  claim 1 , wherein the first, second, and third rails are each arranged to form a cross section including a coupling unit that extends in the vertical direction and upper and lower ends that bend toward one side. 
     
     
         3 . The dishwasher of  claim 2 , wherein the upper and lower ends of each respective rail of the first, second, and third rails bend toward one side of the coupling unit of the respective rail in an identical form. 
     
     
         4 . The dishwasher of  claim 3 , wherein the coupling unit of the first rail is formed to extend longer than the coupling unit of the second rail in the vertical direction, and the coupling unit of the second rail is formed to extend longer than the coupling unit of the third rail in the vertical direction. 
     
     
         5 . The dishwasher of  claim 4 , wherein
 the first and second rails are arranged such that the upper end of the second rail is placed below the upper end of the first rail and the lower end of the second rail is placed above the lower end of the first rail, and   the second and third rails are arranged such that the upper end of the third rail is placed below the upper end of the second rail and the lower end of the third rail is placed above the lower end of the second rail.   
     
     
         6 . The dishwasher of  claim 5 , wherein
 the plurality of first balls include at least one first upper ball placed between the upper end of the first rail and the upper end of the second rail, and at least one first lower ball placed between the lower end of the first rail and the lower end of the second rail, and   the plurality of second balls include at least one second upper ball placed between the upper end of the second rail and the upper end of the third rail, and at least one second lower ball placed between the lower end of the second rail and the lower end of the third rail.   
     
     
         7 . The dishwasher of  claim 6 , further comprising:
 a first retainer to hold the at least one first upper ball and the at least one first lower ball; and   a second retainer to hold the at least one second upper ball and the at least one second lower ball.   
     
     
         8 . The dishwasher of  claim 3 , wherein
 the upper and lower ends of the second rail are arranged toward a same direction as that of the upper and lower ends of the first rail, and   the upper and lower ends of the third rail are arranged toward an opposite direction of that of the upper and lower ends of the first rail.   
     
     
         9 . The dishwasher of  claim 1 , wherein the draw-out unit includes a first retainer placed between the first and second rails, and a second retainer placed between the second and third rails. 
     
     
         10 . The dishwasher of  claim 9 , wherein the first retainer includes a plurality of first ball installation units that hold the plurality of first balls, and the second retainer includes a plurality of second ball installation units that hold the plurality of second balls. 
     
     
         11 . The dishwasher of  claim 9 , wherein
 the first retainer is installed to be able to move along the first rail, and the first rail includes a first fastening rib to prevent the first retainer from deviating from the first rail, and   the second retainer is installed to be able to move along the second rail, and the second rail includes a second fastening rib to prevent the second retainer from deviating from the second rail.   
     
     
         12 . The dishwasher of  claim 1 , wherein the first rail is attached onto an inner side of the tub, the third rail is coupled with the basket, and the second rail is between the first and third rails. 
     
     
         13 . The dishwasher of  claim 12 , further comprising:
 a coupling unit on a side of the basket and being coupled with the third rail to movably support the basket.   
     
     
         14 . The dishwasher of  claim 13 , wherein the coupling unit includes a coupling projection that protrudes toward the third rail, and the third rail includes a coupling groove into which the coupling projection is fit. 
     
     
         15 . The dishwasher of  claim 14 , further comprising:
 a coupling member detachably coupled with the third rail so as to fasten the coupling projection fit into the coupling groove.   
     
     
         16 . A dishwasher comprising:
 a tub;   a basket arranged inside the tub to load dishes;   a first rail fixed onto an inner wall of the tub;   a second rail installed to be able to move along the first rail;   a third rail installed to be able to move along the second rail and coupled with the basket;   a first ball bearing placed between the first and second rails and arranged to be able to move along the first rail; and   a second ball bearing placed between the second and third rails and arranged to be able to move along the second rail.   
     
     
         17 . The dishwasher of  claim 16 , wherein
 the first ball bearing includes at least one first ball and a first retainer to hold the at least one first ball, and   the second ball bearing includes at least one second ball and a second retainer to hold the at least one second ball.   
     
     
         18 . The dishwasher of  claim 17 , wherein the at least one first ball and the at least one second ball are arranged in a vertical direction. 
     
     
         19 . A dishwasher comprising:
 a tub;   a basket arranged in the tub to load dishes; and   a draw-out unit installed between the tub and the basket, the draw-out unit including a plurality of rails for guiding movement of the basket,   wherein the plurality of rails include a first rail attached to the tub, a second rail having one side adjacent to the first rail, and a third rail having one side adjacent to the second rail and another side coupled with the basket, and   wherein the first rail is formed to extend longer than the second rail in a vertical direction, and the second rail is formed to extend longer than the third rail in the vertical direction.   
     
     
         20 . The dishwasher of  claim 19 , wherein each respective rail of the plurality of rails is formed to have a cross section that includes a coupling unit that extends in the vertical direction and upper and lower ends that bend from the coupling unit of the respective rail in a same direction. 
     
     
         21 . The dishwasher of  claim 20 , wherein the upper and lower ends of the first and second rails are arranged toward the basket, and the upper and lower ends of the third rail are arranged toward an opposite direction than the upper and lower ends of the first and second rails. 
     
     
         22 . The dishwasher of  claim 21 , wherein the draw-out unit includes a first ball bearing placed between the first and second rails, and a second ball bearing placed between the second and third rails. 
     
     
         23 . The dishwasher of  claim 22 , wherein
 the first ball bearing includes a first upper ball placed between the upper end of the first rail and the upper end of the second rail, and a first lower ball placed between the lower end of the first rail and the lower end of the second rail, and   the second ball bearing includes a second upper ball placed between the upper end of the second rail and the upper end of the third rail, and a second lower ball placed between the lower end of the second rail and the lower end of the third rail.   
     
     
         24 . A dishwasher comprising:
 a tub;   a basket arranged inside the tub; and   a draw-out unit to guide the basket to be drawn out from the tub, the draw-out unit including
 a first rail having first and second sides, 
 a second rail having first and second sides, 
 a third rail having first and second sides, and 
 first and second ball bearings, 
 wherein the first, second and third rails, and the first and second ball bearings are coupled together with the first side of the first rail attached to the tub, the second side of the first rail adjacent to the first side of the second rail, the second side of the second rail adjacent to the first side of the third rail, the second side of the third rail coupled to the basket, the first ball bearing between the first and second rails, and the second ball bearing between the second and third rails.