Undetachable drawer rail

Abstract

A undetachable drawer rail includes a U-shaped outer track ( 10 ), a U-shaped inner track ( 20 ), a bearing race ( 30 ), a rail ( 40 ) slidably mounted on the inner track ( 20 ), a resilient latch ( 50 ) secured on the rail ( 40 ) and a intermediate stop ( 60 ). The inner track ( 20 ) has a limit block ( 21 ) with a passage attached to the front end. The resilient latch ( 50 ) with a V-shaped fork ( 52 ) passes through the passage in the limit block ( 21 ) by compressing the fork ( 52 ), and then the fork ( 52 ) returns to its original shape after entering the inner track ( 20 ). Thereby, the rail ( 40 ) is blocked. Additionally, the outer track ( 10 ) further has an inner arrow shaped stub ( 13 ) formed toward the inner track ( 20 ) to selectively abut the intermediate stop ( 60 ) to enhance stability of the undetachable drawer rail.

What is claimed is:  
     
         1 . A undetachable drawer rail comprising: 
 a U-shaped outer track ( 10 ) adapted to attach to an inner side face of a drawer compartment;    a U-shaped inner track ( 20 ) with a bottom, a front end, and a rear end, the inner track ( 20 ) slidably mounted inside the U-shaped outer track ( 10 ) and having a limit block ( 21 ) mounted in the front end of the inner track ( 20 ) and a intermediate stop ( 60 ) mounted near the rear end, wherein the limit block ( 21 ) is U-shaped with a vertical base, two sidewalls corresponding to the inner track ( 20 ) and two locking protrusions ( 212 ) formed perpendicular to the limit block ( 21 ) and respectively on opposite sides of the limit block ( 21 ) to form a passage ( 213 ) between the two locking protrusions ( 212 ) and two sub-passage ( 210 ) between the sidewalls and the corresponding locking protrusions ( 212 );    a ball bearing race ( 30 ) movably mounted on the inner track ( 20 );    a rail ( 40 ) adapted to attach to a side of a drawer and slidably mounted in the inner track ( 20 ); and    a resilient latch ( 50 ) having a front end, a rear end, a V-shaped fork ( 52 ) with two tines formed at the front end and a proximal head ( 51 ) formed at the rear end, wherein the fork ( 52 ) extends toward the front end of the inner track ( 20 ) and each tine of the fork ( 52 ) is adapted to abut the locking protrusions ( 212 ) of the limit block ( 21 ).    
     
     
         2 . The undetachable drawer rail as claimed in  claim 1 , wherein the U-shaped outer track ( 10 ) further has an inner arrow-shaped stub ( 13 ) formed on the outer track ( 10 ); 
 the U-shaped inner track ( 20 ) further has an opening ( 23 ) defined in the other end opposite to the limit block ( 21 ); and    the intermediate stop ( 60 ) is a strip and has a proximal end, a distal end ( 61 ) pivotally attached to the inner track ( 20 ), a pair of stop wings ( 610 ) formed in parallel at the distal end ( 61 ) and extending through the opening ( 23 ) in the inner track ( 20 ) and a pair of inclined guide wings ( 612 ) extending toward the rail ( 40 ) and diverging toward the distal end ( 61 ) to linearly connect with the pair of stop wings ( 610 ), wherein the pair of stop wings ( 610 ) aligns with the inner arrow-shaped stub ( 13 ) on the outer track ( 10 ).    
     
     
         3 . The undetachable drawer rail as claimed in  claim 1 , wherein the rail ( 20 ) further has a open rear end ( 41 ) and a tongue ( 43 ) defined in a middle portion; and 
 the resilient latch ( 50 ) further has a vertical slot ( 511 ) corresponding to the tongue ( 43 ) on the rail ( 40 ) defined in the proximal head ( 51 ) of the resilient latch ( 50 ).    
     
     
         4 . The undetachable drawer rail as claimed in  claim 2 , wherein the rail ( 40 ) further has a open rear end ( 41 ) and a tongue ( 43 ) defined in a middle portion; and 
 the resilient latch ( 50 ) further has a vertical slot ( 511 ) corresponding to the tongue ( 43 ) on the rail ( 40 ) defined in the proximal head ( 51 ) of the resilient latch ( 50 ).    
     
     
         5 . The undetachable drawer rail as claimed in  claim 1 , wherein each tine of the fork ( 52 ) has a flat face formed at a distal end to abut the corresponding locking protrusions ( 212 ).  
     
     
         6 . The undetachable drawer rail as claimed in  claim 2 , wherein each tine of the fork ( 52 ) has a flat face formed at a distal end to abut the corresponding locking protrusions ( 212 ).  
     
     
         7 . The undetachable drawer rail as claimed in  claim 4 , wherein each tine of the fork ( 52 ) has a flat face formed at a distal end to abut the corresponding locking protrusions ( 212 ).  
     
     
         8 . The undetachable drawer rail as claimed in  claim 1 , wherein each tine of the fork ( 52 ′) has a guide head ( 521 ′) with an arc root formed at a distal end and a detent ( 53 ′) formed between the guided head ( 521 ′) and the proximal head ( 51 ′).  
     
     
         9 . The undetachable drawer rail as claimed in  claim 2 , wherein each tine of the fork ( 52 ′) has a guide head ( 521 ′) with an arc root formed at a distal end and a detent ( 53 ′) formed between the guided head ( 521 ′) and the proximal head ( 51 ′).  
     
     
         10 . The undetachable drawer rail as claimed in  claim 4 , wherein each tine of the fork ( 52 ′) has a guide head ( 521 ′) with an arc root formed at a distal end and a detent ( 53 ′) formed between the guide head ( 521 ′) and the proximal head ( 51 ′).