Desk with retractable board and retractable board device

Abstract

A desk of the present invention has a plank member with a slot and a retractable board. Two parallel rails are provided in the slot and engaged with the retractable board. The retractable board is moved between a retracted condition and an extended condition. When the retractable board is moved to the retracted condition, the retractable board is located in the slot of the desk, and when the retractable board is moved to the extended condition, the retractable board is moved out of the slot and substantially perpendicular to the plank member.

1 . A desk having a plank member with two parallel rail and a retractable board provided on the rail for movement, wherein the retractable board is moved between a retracted condition, in which the retractable board is located in the desk, and an extended condition, in which the retractable board is moved out of the desk and substantially perpendicular to the plank member.  
   
   
       2 . The desk as defined in  claim 1 , wherein the plank member has a slot with two sidewalls, on which the rails are provided, and the retractable board is received in the slot in the retractable condition.  
   
   
       3 . The desk as defined in  claim 1 , wherein the retractable board has a base board with sliding member engaged with the rails for movement and a movable board pivoted on an end of the base board to be turned to the extended condition.  
   
   
       4 . The desk as defined in  claim 3 , further comprising means for fixing the movable board at the extended condition.  
   
   
       5 . The desk as defined in  claim 4 , wherein a ratchet is provided between the base board and the movable board.  
   
   
       6 . The desk as defined in  claim 4 , wherein the base board has a hole, and the movable board has a hole whereby the hole of the movable board is aligned with the hole of the base board when the movable board is moved to the extended condition to insert a pin in the holes.  
   
   
       7 . The desk as defined in  claim 1 , wherein the retractable board is pivoted with an extended board on an edge along a horizontal direction.  
   
   
       8 . The desk as defined in  claim 1 , wherein the retractable board is pivoted with an extended board on an edge along a perpendicular direction.  
   
   
       9 . A retractable board device, comprising: 
 a base to be fixed to a desk;    two rails mounted on the base;    a retractable board engaged with the rails for movement, wherein the retractable board is moved between a retracted condition, in which the retractable board is located in the base, and an extended condition, in which the retractable board is moved out of the base and substantially perpendicular to the base.    
   
   
       10 . The retractable board device as defined in  claim 9 , wherein the base has a plate, on which the rails are provided, and a cover mounted on the plate to mask the rails.  
   
   
       11 . The retractable board device as defined in  claim 9 , wherein the retractable board has a base board and a movable board pivoted on the base board to be turned relative to the base board.  
   
   
       12 . The retractable board device as defined in  claim 9 , further comprising means for fixing the movable board at the extended condition.  
   
   
       13 . The retractable board device as defined in  claim 12 , wherein a ratchet is provided between the base board and the movable board.  
   
   
       14 . The retractable board device as defined in  claim 12 , wherein the base board has a hole, and the movable board has a hole whereby the hole of the movable board is aligned with the hole of the base board when the movable board is moved to the extended condition to insert a pin in the holes.  
   
   
       15 . The retractable board device as defined in  claim 9 , wherein the retractable board is pivoted with an extended board on an edge along a horizontal direction.  
   
   
       16 . The retractable board device as defined in  claim 9 , wherein the retractable board is pivoted with an extended board on an edge along a perpendicular direction.