Patent Publication Number: US-7222391-B2

Title: Wireless blackboard eraser and dust collector

Description:
FIELD OF THE INVENTION 
   The present invention provides a kind of wireless blackboard eraser and dust collector machine comprising an air blower and a shell. When using the machine to erase blackboards or the like, the air blower inside the shell will suck in the dust particles, so as to prevent them from flying away. 
   BACKGROUND OF THE INVENTION 
   Generally speaking, most teaching places are equipped with backboard or whiteboard for the teacher to write down the text or to make explanations. In some occasions, pencils or whiteboard-writing pens are used for writing on whiteboards. But pencils and whiteboard-writing pens often contain volatilizable and poisonous organic solvents, which do much harm to human bodies. In other places chalks are used. The chalk dusts adhere on the blackboard, and with the motion of the eraser, drop down and fly away all around, making the ambient space filled with chalk dusts. This is also very harmful to the teachers and learners, especially, the young children. Since using chalks and common blackboard erasers causes lots of flying dusts, it is not good to the health and inconvenient for teaching, and is often criticized by the teachers. 
   SUMMARY OF THE INVENTION 
   The present invention installs an air blower inside the shell body and an erasing plate set, which is permeable for the air but not for the dusts, at the bottom of the shell, thus finally completes a blackboard eraser and dust collector. When using the machine to erase blackboards or the like, the air blower inside the shell will suck in the dust particles, so as to prevent them from flying away and avoid the harm to human bodies. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Drawings 
       FIG. 1 : Space diagram of the present invention 
       FIG. 2 : Breakdown drawing of the present invention 
       FIG. 3 : Spatial sectional drawing of the present invention 
       FIG. 4 : Sectional side view of the present invention 
       FIG. 5 : Drawing of cleaning the present invention 
   

   CODE NUMBERS 
   
       
       
         
           ( 1 ) Blackboard eraser and dust collector 
           ( 10 ) Shell body 
           ( 11 ) Left shell 
           ( 112 ) Battery 
           ( 12 ) Right shell 
           ( 122 ) Power switch 
           ( 111 ) Battery seat 
           ( 121 ) Opening 
           ( 13 ) Battery cover 
           ( 20 ) Air blower 
           ( 21 ) Motor 
           ( 30 ) Erasing plate set 
           ( 31 ) Erasing cloth 
           ( 32 ) Air-permeable sponge piece 
           ( 331 ) Hole 
           ( 341 ) Air-permeable papers 
           ( 2 ) Blackboard eraser cleaner 
           ( 22 ) Fan 
           ( 311 ) Pore 
           ( 33 ) Base plate 
           ( 34 ) Air-permeable paper group 
           ( 342 ) Frame 
           ( 3 ) Placement groove 
         
       
     
  
   DETAILED DESCRIPTION OF THE INVENTION 
   As shown in  FIGS. 1˜4 , the blackboard eraser and dust collector ( 1 ) consists of a shell body ( 10 ), an air blower ( 20 ), and an erasing plate set ( 30 ). 
   And as shown in  FIGS. 2 and 3 , the shell body ( 10 ) is divided into the left shell ( 11 ) and the right shell ( 12 ), which are in symmetry with each other. Inside the left shell ( 11 ) there is a battery seat ( 111 ) for placing battery ( 112 ), and on the exterior surface of the right shell ( 12 ) is an opening ( 121 ) for installing a power switch ( 122 ) here. 
   The air blower ( 20 ) is composed of a motor ( 21 ) and a fan ( 22 ). 
   The erasing plate set ( 30 ) is composed of a piece of erasing cloth ( 31 ), a piece of air-permeable sponge ( 32 ), a base plate ( 33 ), and an air-permeable paper group ( 34 ), which are overlapped in sequence. 
   On the erasing cloth ( 31 ) there are many regular small pores ( 311 ). The sponge ( 32 ) is permeable for the air but not for the dusts. On the base plate ( 33 ) there are multiple irregular holes ( 331 ) for air to flow. And the air-permeable paper group is composed of the air-permeable papers ( 341 ), which are folded into a form of stereo saw tooth, and a frame ( 342 ) installed around. 
   Please refer to  FIGS. 2˜4 . Firstly, install the air blower ( 20 ) inside the left shell ( 11 ), and place the battery ( 112 ) in the battery seat ( 111 ). Then, install the right shell ( 12 ) together with the left shell ( 11 ), and place the battery cover ( 13 ) on the back of the left and right shells ( 11 ) and ( 12 ). Secondly, plaster the erasing cloth ( 31 ) onto the air-permeable sponge piece ( 32 ), and attach the two onto one surface of the base plate ( 33 ); and then place the air-permeable paper group ( 34 ) on the other surface of the base plate ( 33 ), so as to finish the whole erasing plate set ( 30 ). Finally, install the erasing plate set ( 30 ) under the shell body ( 10 ), thus completely finish the blackboard eraser and dust collector ( 1 ). 
   As shown in  FIGS. 3 and 4 , when using the blackboard eraser and dust collector ( 1 ) to erase blackboard or the like, the user turns on the power switch ( 122 ), then the air blower ( 20 ) inside the blackboard eraser and dust collector ( 1 ) makes suction actions. Sucked in by the air blower ( 20 ), the dusts produced in the process of erasing will enter the air-permeable sponge piece ( 32 ) through the small pores ( 311 ) on the erasing cloth ( 31 ) of the erasing plate set ( 30 ). Among the dusts, the larger particles will remain inside the air-permeable sponge piece ( 32 ), and the smaller ones will directly enter the air-permeable papers ( 341 ) of the air-permeable paper group ( 34 ). 
   As shown in  FIG. 5 , after the blackboard eraser and dust collector ( 1 ) finishes the work, some residual dusts will remain on the surface of the erasing cloth ( 31 ) and the sucked dusts will accumulate on the air-permeable sponge piece ( 32 ) and the air-permeable papers ( 341 ). At that time, just move the blackboard eraser and dust collector ( 1 ) to the placement groove ( 3 ) of the blackboard eraser cleaner ( 2 ), and then the cleaner ( 2 ) will suck the dusts on the surface of the erasing cloth ( 31 ), the air-permeable sponge piece ( 32 ), and the air-permeable papers ( 341 ) into the interior of the cleaner ( 2 ), so as to clean the blackboard eraser and dust collector ( 1 ).