Dust box and belt sander

Abstract

A dust box is provided that is configured to be removably mounted to a belt sander having a housing, and a discharge nozzle and a suction nozzle that are connected to the housing. The dust box has a first nozzle configured to be connected to the discharge nozzle, a second nozzle configured to be connected to the suction nozzle, a container part formed of synthetic resin and connected to the first and second nozzles, and a filter. The filter is configured to separate dust from air. The filter is provided within the container part to partition an inside space of the container part into a first space that communicates with the first nozzle and a second space that communicates with the second nozzle.

1 . A dust box, which is configured to be removably mounted to a belt sander, the belt sander having a belt driving part configured to rotate an endless sanding belt, and a housing that has a discharge nozzle and a suction nozzle and houses an electric motor for driving the belt driving part and a dust collecting fan, the dust box comprising:
 a first nozzle configured to be connected to the discharge nozzle;   a second nozzle configured to be connected to the suction nozzle;   a container part formed of synthetic resin and connected to the first and second nozzles; and   a filter that is configured to separate dust from air and arranged within the container part to partition an inside space of the container part into a first space that communicates with the first nozzle and a second space that communicates with the second nozzle.   
     
     
         2 . The dust box as defined in  claim 1 , wherein the filter is arranged closer to the second nozzle than to the first nozzle within the container part. 
     
     
         3 . The dust box as defined in  claim 1 , wherein:
 the belt driving part includes a drive roller that is rotated by the motor, and a driven roller, and where a direction in which a rotational axis of the drive roller and a rotational axis of the driven roller extend is defined as a left-right direction, a direction in which the drive roller and the driven roller are arranged in parallel is defined as a front-rear direction, and a direction orthogonal to the left-right direction and the front-rear direction is defined as an up-down direction, a polishing surface is defined by a lower surface of the sanding belt, and   the dust box is configured such that, when the dust box is mounted to the belt sander, the first nozzle is located below the second nozzle, and the first space is a lower space within the container part.   
     
     
         4 . The dust box as defined in  claim 1 , wherein the first and second nozzles are open in the same direction. 
     
     
         5 . The dust box as defined in  claim 1 , wherein the filter is a bag-like air filter having an open end. 
     
     
         6 . The dust box as defined in  claim 1 , wherein:
 the container part has a nozzle connection part that is connected to the first and second nozzles, and a body part that is removably fitted to the nozzle connection part, and   the filter is provided on the nozzle connection part.   
     
     
         7 . The dust box as defined in  claim 6 , further comprising an attaching/detaching part configured to attach and detach the body part to and from the nozzle connection part. 
     
     
         8 . The dust box as defined in  claim 1 , wherein at least part of the dust box is formed of conductive synthetic resin. 
     
     
         9 . The dust box as defined in  claim 8 , wherein:
 where an up-down direction is defined with the side of the belt sander on which the belt driving part is arranged being defined as a lower side and the opposite side defined as an upper side,   at least part of the container part that is located below a central position of the container part in the up-down direction when the dust box is mounted to the belt sander is formed of the conductive synthetic resin.   
     
     
         10 . The dust box as defined in  claim 8 , further comprising an earth member having one end part connected to the part formed of the conductive synthetic resin, and the other end part exposed outside the dust box. 
     
     
         11 . The dust box as defined in  claim 2 , wherein:
 the belt driving part includes a drive roller that is rotated by the motor, and a driven roller, and where a direction in which a rotational axis of the drive roller and a rotational axis of the driven roller extend is defined as a left-right direction, a direction in which the drive roller and the driven roller are arranged in parallel is defined as a front-rear direction, and a direction orthogonal to the left-right direction and the front-rear direction is defined as an up-down direction, a polishing surface is defined by a lower surface of the sanding belt, and   the dust box is configured such that, when the dust box is mounted to the belt sander, the first nozzle is located below the second nozzle, and the first space is a lower space within the container part.   
     
     
         12 . The dust box as defined in  claim 11 , wherein the first and second nozzles are open in the same direction. 
     
     
         13 . A belt sander, having the dust box as defined in  claim 1  and removably mounted thereto. 
     
     
         14 . The belt sander as defined in  claim 13 , comprising:
 an electric motor;   a dust collecting fan;   a housing that houses the motor and the dust collecting fan; and   a belt driving part that includes a drive roller configured to be rotated by the motor, and a driven roller, and is configured to drive an endless sanding belt looped over the drive roller and the driven roller,   wherein:   where a direction in which a rotational axis of the drive roller and a rotational axis of the driven roller extend is defined as a left-right direction, a direction in which the drive roller and the driven roller are arranged in parallel is defined as a front-rear direction, and a direction orthogonal to the left-right direction and the front-rear direction is defined as an up-down direction, the belt driving part is arranged below the housing,   the housing includes:
 a discharge nozzle configured to discharge dust generated by the working operation from the housing and a suction nozzle configured to suck air from the dust box into the housing; 
 a dust collection port provided behind the belt driving part; 
 an air outlet that communicates with a space where the dust collecting fan is housed; 
 a first passage that connects the dust collection port and the discharge nozzle, and 
 a second passage that connects the suction nozzle and the air outlet, wherein: 
 the first passage is separated from spaces where the motor and the dust collecting fan are housed within the housing, and the second passage, and 
 the second passage communicates with the space where the dust collecting fan is housed, and 
   the dust collecting fan is configured to rotate to generate an air flow from the dust collection port toward the discharge nozzle through the first passage, and an air flow from the suction nozzle toward the air outlet through the second passage.   
     
     
         15 . The belt sander as defined in  claim 14 , wherein:
 the suction nozzle and the discharge nozzle are open to the rear, and   the discharge nozzle is arranged below the suction nozzle.