Slide rail for rack sever

Abstract

A slide rail includes an outer slide bracket, an outer slide, a middle slide, an inner slide, a plurality of first ball bearings, a first ball bearing bracket, a plurality of second ball bearings and a second ball bearing bracket. The outer slide is received in the outer slide bracket. The middle slide is received in the outer slide. The inner slide is received in the middle slide. The plurality of first ball bearings and the first ball bearing bracket are positioned between the outer slide and the middle slide. The first ball bearing bracket holds the first ball bearings. The plurality of second ball bearings and the second ball bearing bracket are positioned between the middle slide and the inner slide. The second ball bearing bracket holds the second ball bearings.

1 . A slide rail comprising:
 an outer slide bracket comprising a bottom wall and two sidewalls extending from two edges of the bottom wall, wherein each of the two sidewalls comprises an end turned inward to be parallel with the bottom wall;   an outer slide received in the outer slide bracket;   a middle slide received in the outer slide;   an inner slide received in the middle slide;   a plurality of first ball bearings and a first ball bearing bracket positioned between the outer slide and the middle slide, the first ball bearing bracket holding the first ball bearings; and   a plurality of second ball bearings and a second ball bearing bracket positioned between the middle slide and the inner slide, the second ball bearing bracket holding the second ball bearings.   
     
     
         2 . The slide rail of  claim 1 , wherein the outer slide comprises a first main plate, a first top side part, and a first bottom side part, and wherein the first top side part and the first bottom side part are symmetrically positioned on two opposite sides of the first main plate, integrally extending from the first main plate respectively. 
     
     
         3 . The slide rail of  claim 2 , wherein the first top side part and the first bottom side part are substantially V-shaped, and at each inner side of the first top side part and the first bottom side part, first recesses are defined respectively. 
     
     
         4 . The slide rail of  claim 3 , wherein the middle slide comprises a second main plate, a second top side part, and a second bottom side part, and wherein the second top side part and the second bottom side part are symmetrically positioned on two opposite sides of the second main plate, integrally extending from the second main plate respectively. 
     
     
         5 . The slide rail of  claim 4 , wherein each of the second top side part and the second bottom side part comprises a first curve, and a second curve, and wherein the first curve is extended from the main plate, and the second curve is extended inward from a distal end of the first curve and superposed to the first curve. 
     
     
         6 . The slide rail of  claim 5 , wherein the first curve is substantially V-shaped, and at outer side of the first curve, a second recess is defined, and wherein the second curve is substantially V-shaped, and at inner side of the second curve, a third recess is defined. 
     
     
         7 . The slide rail of  claim 6 , wherein the first ball bearings and the first ball bearing bracket are positioned between the first recesses and the second recesses. 
     
     
         8 . The slide rail of  claim 7 , wherein the inner slide comprises a third main plate, a third top side part, and a third bottom side part, and wherein the third top side part and the third bottom side part are symmetrically positioned on two opposite sides of the third main plate, integrally extending from the third main plate respectively. 
     
     
         9 . The slide rail of  claim 8 , wherein each of the third top side part and the third bottom side part comprises a curved portion extending from a top edge of the third main plate, and a free end turning inward to be generally parallel with the third main plate. 
     
     
         10 . The slide rail of  claim 9 , wherein the curved portion is substantially V-shaped, and at outer side of the curved portion, a fourth recess is defined. 
     
     
         11 . The slide rail of  claim 10 , wherein the second ball bearings and the second ball bearing bracket are positioned between the third recesses and the fourth recesses.