Desk board raising apparatus

Abstract

A desk board raising apparatus has a seat, an active module, a passive module, and a cylinder. The active module is pivotally mounted in the seat and has a base, two linking arms, and a pivot. The linking arms are L-shaped. The pivot is deposited between the linking arms and pivotally mounted in the seat. The passive module is mounted in the seat and has a passive board pivotally connected with the linking arms. The cylinder is mounted in the seat and is adapted to push the passive board. Thus, the base lifted up or down can drive the passive board to move up or down. Therefore, the desk board raising apparatus uses a simple structure to synchronize the movements of the passive board and the base, and therefore has the advantages of convenient operation, low manufacturing cost, low maintenance cost, and consuming no power.

What is claimed is: 
     
         1 . A desk board raising apparatus comprising:
 a seat having:
 two side boards opposite to each other and respectively having a chute; 
   an active module pivotally mounted in the seat and having:
 a base; 
 two linking arms being L-shaped and respectively protruding from two side edges of the base; and 
 a pivot deposited between the linking arms and connected with the side boards; 
   a passive module mounted in the seat and having:
 a passive board deposited between the side boards and having a front end to slip along the chutes and having a rear end to be pivotally connected with the linking arms; and 
   a cylinder mounted in the seat and having:
 a cylinder body having a front end and a rear end, the rear end of the cylinder body mounted in the seat; and 
 a cylinder shaft movably mounted on the cylinder body and having:
 a distal end extending out of the front end of the cylinder body and connected with the passive board of the passive module, and adapted to push the passive board of the passive module. 
 
   
     
     
         2 . The desk board raising apparatus as claimed in  claim 1 , wherein
 the seat has:
 a front board connected with the side boards; 
 a rear board opposite to the front board and connected with the side boards; 
 a chamber defined in the seat and enclosed by the front board, the rear board, and the side boards; 
 an opening defined in a top surface of the seat and in communication with the chamber; and 
 an inclined surface defined on a front surface of the front board. 
   
     
     
         3 . The desk board raising apparatus as claimed in  claim 2 , wherein
 the desk board raising apparatus has:
 a desk board module having:
 an outer board mounted on the top surface of the seat around the opening of the seat; 
 a raising board mounted on the base of the active module; and 
 an inner board mounted on the passive board of the passive module; and 
 
   the passive board has a wall extending above a top surface of the inner board.   
     
     
         4 . The desk board raising apparatus as claimed in  claim 3 , wherein
 the desk board module has a pressing locker mounted on a bottom surface of the raising board; and   the seat has a positioning member mounted on the front board and selectively engaging the pressing locker.   
     
     
         5 . The desk board raising apparatus as claimed in  claim 4 , wherein
 the board raising apparatus has
 a locking board being bent and mounted on the bottom surface of the raising board; and 
 a lock rotatably mounted on the front board and having:
 a locking hole; and 
 a locking hook selectively engaging the locking board. 
 
   
     
     
         6 . The desk board raising apparatus as claimed in  claim 1 , wherein the passive module has two sliders, and the sliders are respectively mounted on two sides of the passive board, each slider slidably mounted in a corresponding one of the chutes. 
     
     
         7 . The desk board raising apparatus as claimed in  claim 2 , wherein the passive module has two sliders, and the sliders are respectively mounted on two sides of the passive board, each slider slidably mounted in a corresponding one of the chutes. 
     
     
         8 . The desk board raising apparatus as claimed in  claim 3 , wherein the passive module has two sliders, and the sliders are respectively mounted on two sides of the passive board, each slider slidably mounted in a corresponding one of the chutes. 
     
     
         9 . The desk board raising apparatus as claimed in  claim 4 , wherein the passive module has two sliders, and the sliders are respectively mounted on two sides of the passive board, each slider slidably mounted in a corresponding one of the chutes. 
     
     
         10 . The desk board raising apparatus as claimed in  claim 5 , wherein the passive module has two sliders, and the sliders are respectively mounted on two sides of the passive board, each slider slidably mounted in a corresponding one of the chutes. 
     
     
         11 . The desk board raising apparatus as claimed in  claim 1 , wherein the desk board raising apparatus has a screen bracket mounted on the base of the active module. 
     
     
         12 . The desk board raising apparatus as claimed in  claim 2 , wherein the desk board raising apparatus has a screen bracket mounted on the base of the active module. 
     
     
         13 . The desk board raising apparatus as claimed in  claim 3 , wherein the desk board raising apparatus has a screen bracket mounted on the base of the active module. 
     
     
         14 . The desk board raising apparatus as claimed in  claim 4 , wherein the desk board raising apparatus has a screen bracket mounted on the base of the active module. 
     
     
         15 . The desk board raising apparatus as claimed in  claim 5 , wherein the desk board raising apparatus has a screen bracket mounted on the base of the active module.