Drawer sliding device

Abstract

Disclosed is a drawer sliding device. The drawer sliding device is configured such that when a drawer is pulled out, an intermediate rail and an inner rail are moved together. Therefore, the load support capacity of a drawer slide can be enhanced and the drawer can be smoothly pulled out. The drawer sliding device may be designed such that the intermediate rail can be extended to a position above an operating rail. In this case, the range of the operation of the automatic closing means can be increased without a reduction in the structural strength of the rail. Furthermore, in the present invention, the drawer slide is provided with the automatic closing means. Therefore, when the drawer is retracted to a predetermined range or more, the drawer can be automatically retracted to a completely closed position, and the drawer in the closed state can be prevented from being undesirably opened.

1 . A drawer sliding device for guiding a drawer, the drawer sliding device comprising:
 an outer rail having a first surface to be fastened one of the drawer and a storage body having a storage space into which the drawer is pulled out from or retracted, and a second surface;   an intermediate rail coupled to the outer rail to be slidable in a direction parallel to a longitudinal direction of the outer rail;   an inner rail coupled to the intermediate rail to be slidable in a direction parallel to a longitudinal direction of the intermediate rail, the inner rail being to be fastened to the other one of the storage body and the drawer; and   an automatic closing unit coupled to the outer rail, the automatic closing unit comprising:
 a closing unit body coupled to a first end of the second surface of the outer rail; 
 an operating rail protruding from the closing unit body towards a second end of the outer rail, the operating rail having a linear portion oriented parallel to a direction in which the drawer is pulled out, and a curved portion bent from an end of the linear portion in a direction different from the linear portion; 
 a slider coupled to the operating rail to be slidable in a longitudinal direction of the operating rail; 
 an operating pin having a first end disposed in the guide depression and a second end passing through the slider and protrudes from the slider; and 
 an elastic body having a first end fastened to the closing unit body and a second end fastened to the slider, the elastic body elastically supporting the slider towards the closing unit body, 
 wherein while the drawer is pulled out, the slider makes contact with the intermediate rail and moves along with the inner rail and the intermediate rail until the first end of the operating pin reaches the curved portion via the linear portion. 
   
     
     
         2 . The drawer sliding device of  claim 1 , wherein a push rod protrudes from the slider so that when the drawer is pulled out, the push rod comes into contact with the intermediate rail and pushes the intermediate rail. 
     
     
         3 . The drawer sliding device of  claim 1 , wherein a slot is formed in an end of the intermediate rail that faces the closing unit body, the slot receiving the operating rail therein when the drawer is in a retracted state,
 wherein a portion of the end of the intermediate rail other than the slot is brought into contact with and is pushed by the slider when the drawer is pulled out.   
     
     
         4 . The drawer sliding device of  claim 1 , wherein a height to which the operating rail protrudes from the second surface of the outer rail is less than a distance between the second surface of the outer rail and the intermediate rail,
 wherein when the drawer is in a retracted state, a portion of the operating rail that faces the second end of the outer rail is disposed between the outer rail and the intermediate rail, and   an end of the intermediate rail that faces the closing unit body is brought into contact with and is pushed by the slider when the drawer is pulled out.   
     
     
         5 . The drawer sliding device of  claim 1 , wherein an insert hole is formed in a portion of the outer rail at which the operating rail is disposed, the insert hole having a shape corresponding to the operating rail, and
 the operating rail is disposed in the insert hole.   
     
     
         6 . The drawer sliding device of  claim 2 , wherein a shock absorber is provided at a position at which the slider and the intermediate rail make contact with each other. 
     
     
         7 . The drawer sliding device of  claim 6 , wherein the shock absorber comprises a shock absorption member made of elastic material, the shock absorption member being coupled to the slider or the intermediate rail, or a shock absorption protrusion protruding from the slider. 
     
     
         8 . The drawer sliding device of  claim 4 , wherein an insert hole is formed in a portion of the outer rail at which the operating rail is disposed, the insert hole having a shape corresponding to the operating rail, and
 the operating rail is disposed in the insert hole.   
     
     
         9 . The drawer sliding device of  claim 3 , wherein a shock absorber is provided at a position at which the slider and the intermediate rail make contact with each other. 
     
     
         10 . The drawer sliding device of  claim 4 , wherein a shock absorber is provided at a position at which the slider and the intermediate rail make contact with each other.