Electronic blackboard eraser

Abstract

An electronic blackboard eraser consists of an erasing unit, a control unit having a driving element and an air fan set, and a filter unit located between the erasing unit and the control unit. The erasing unit has an erasing surface mounted with a plurality of erasing elements formed in strips for erasing blackboards. In addition to erasing the blackboards, this invention can also collect dust and powder.

What is claimed is:  
     
         1 . An electronic blackboard eraser for erasing blackboards and collecting dust and powder, comprising: 
 an erasing unit having a compartment containing a first dust suction member, and an erasing surface mounted with a plurality of erasing elements, the erasing elements having a plurality of suction inlets formed therebetween;    a control unit having a housing space for holding a driving element and an air fan set mounted below the driving element; and    a filter unit located between the erasing unit and the control unit including a housing chamber for holding the air fan set.    
     
     
         2 . The electronic blackboard eraser of  claim 1 , wherein the driving element is a DC motor.  
     
     
         3 . The electronic blackboard eraser of  claim 1 , wherein the air fan set is a centrifugal fan.  
     
     
         4 . The electronic blackboard eraser of  claim 1 , wherein the air fan set is an axial flow fan.  
     
     
         5 . The electronic blackboard eraser of  claim 1 , wherein power supply for the driving element is a storage battery.  
     
     
         6 . The electronic blackboard eraser of  claim 1 , wherein power supply for the driving element is a dry battery.  
     
     
         7 . The electronic blackboard eraser of  claim 1 , wherein the periphery of the driving element is surrounded by an isolation cotton for reducing noise generated by the driving element during operation.  
     
     
         8 . The electronic blackboard eraser of  claim 1 , wherein the filter unit further has two holding spaces located at two sides of the housing chamber for holding respectively a second dust suction member for adsorbing dust and powder escaping the first dust suction member of the erasing unit.  
     
     
         9 . The electronic blackboard eraser of  claim 1 , wherein the erasing elements on the erasing surface are selectively configured in the form of strips, circular, rectangular, saw patterns, or undulated patterns.  
     
     
         10 . The electronic blackboard eraser of  claim 1 , wherein the periphery of the erasing surface has a plurality of suction inlets.  
     
     
         11 . The electronic blackboard eraser of  claim 1 , wherein the first and the second dust suction member are made of washable and reusable materials including sponge.  
     
     
         12 . The electronic blackboard eraser of  claim 1 , wherein the suction inlets are formed in grid or grate shapes.  
     
     
         13 . The electronic blackboard eraser of  claim 1 , wherein the peripheral sides of the erasing unit has a plurality of latch lugs and straps for fastening the control unit and the filter unit and the erasing unit securely.  
     
     
         14 . The electronic blackboard eraser of  claim 1 , wherein the peripheral sides of the erasing unit, the control unit, and the filter unit have respectively snap latches for engaging the erasing unit, the control unit and the filter unit together.  
     
     
         15 . The electronic blackboard eraser of  claim 14 , wherein the snap latches are matching tenons and latch notches.