Dust collection adapter and power tool including dust collection adapter

Abstract

To a power tool main body to which a main body spindle rotationally driving a tip tool is provided, a dust collection adapter for collecting dusts generated when a material to be ground is processed by the tip tool is held thereto. The dust collection adapter includes: a dust collection fan rotationally driven by the main body spindle; and a dust collection cover for containing the dust collection fan and covering a diametrical outside of the tip tool. The dust collection fan includes: a fan main body to which a plurality of blade portions are provided; and a threaded shaft portion provided to a center portion of the fan main body. To the threaded shaft portion, a female thread portion thread-coupled to the main body spindle and a male thread portion thread-coupled to a fastening thread member for fixing the tip tool are provided.

1 . A dust collection adapter which is attached to a power tool main body and which collects dusts generated when a material to be ground is processed by a tip tool rotationally driven by a main body spindle of the power tool main body, comprising:
 a dust collection fan which is rotationally driven by the main body spindle; and   a dust collection cover which is held to the power tool main body to contain the dust collection fan therein and which covers a diametrical outside of the tip tool,   the dust collection fan including: a fan main body having a plurality of blades; and a threaded shaft portion which is provided to a diametrical center portion of the fan main body and where a female thread portion thread-coupled to a male thread portion of the main body spindle is formed, and   a male thread portion thread-coupled to a fastening member for fixing the tip tool being provided to a tip of the threaded shaft portion.   
     
     
         2 . The dust collection adapter according to  claim 1 , wherein a rotation-restricting portion for restricting rotation of the dust collection fan in a rotational direction of the fastening member when the fastening member is rotated with respect to the male thread portion is provided to the threaded shaft portion. 
     
     
         3 . The dust collection adapter according to  claim 2 , wherein
 the rotation-restricting portion is a recess portion such as a hexagonal hole which opens at a tip surface of the male thread portion of the threaded shaft portion and which is engaged with an attachment/detachment jig, and   the attachment/detachment jig is engaged with the recess portion to restrict the rotation of the dust collection fan in the rotational direction of the fastening member.   
     
     
         4 . The dust collection adapter according to  claim 2 , wherein
 the rotation-restricting portion is a protrusion such as a hexagonal protrusion which protrudes from a tip surface of the male thread portion of the threaded shaft portion and which is engaged with an attachment/detachment jig, and   the attachment/detachment jig is engaged with the protrusion to restrict the rotation of the dust collection fan in the rotational direction of the fastening member.   
     
     
         5 . The dust collection adapter according to  claim 1 , wherein
 the threaded shaft portion is fixed to the fan main body.   
     
     
         6 . The dust collection adapter according to  claim 1 , wherein
 the threaded shaft portion is formed integrally with the fan main body.   
     
     
         7 . The dust collection adapter according to  claim 1 , wherein
 the threaded shaft portion is an extension spindle portion which is detachably held to the fan main body and which extends the main body spindle.   
     
     
         8 . The dust collection adapter according to  claim 1 , wherein
 a net-shaped member which suppresses entering of a foreign substance from the tip tool to the dust collection fan is provided to the dust collection cover.   
     
     
         9 . The dust collection adapter according to  claim 8 , wherein
 the net-shaped member includes: a ring portion; and a plurality of rib portions which are curved from an inner peripheral surface of the dust collection cover in the rotational direction of the dust collection fan and which extend toward the ring portion so as to be integrated with the ring portion.   
     
     
         10 . The dust collection adapter according to  claim 8 , wherein
 the net-shaped member includes: a first ring portion; a second ring portion whose diameter is larger than a diameter of the first ring portion; and a plurality of rib portions which are curved from an inner peripheral surface of the dust collection cover in the rotational direction of the dust collection fan and which extend toward the second ring portion.   
     
     
         11 . The dust collection adapter according to  claim 8 , wherein
 the net-shaped member includes: an annular plate member in which a plurality of through-holes are formed; and a plurality of rib portions which are curved from an inner peripheral surface of the dust collection cover in the rotational direction of the dust collection fan and which extend toward the second ring portion to be integrated with the plate member.   
     
     
         12 . The dust collection adapter according to  claim 1 , further comprising: an annular holder which is arranged at a tip portion of the dust collection cover so as to be movable in an axial direction; a skirt member made of fabric which is held to the holder and which prevents scattering of dusts generated when the material to be ground is processed; and a spring member which is arranged between the holder and the dust collection cover and which applies spring force to the holder in a direction that the skirt member protrudes from a front surface of the dust collection cover. 
     
     
         13 . The dust collection adapter according to  claim 12 , wherein
 the skirt member is held to the holder so that both ends of a band-shaped member are abutted to each other, and the abutting portion is arranged in a region corresponding to an exhaust opening of the dust collection cover.   
     
     
         14 . The dust collection adapter according to  claim 13 , wherein
 the skirt member is formed by laminating a plurality of members.   
     
     
         15 . The dust collection adapter according to  claim 12 , wherein
 a plurality of engagement stops which protrude diametrically outward are provided to the holder, attachment grooves which are engaged with the respective engagement stops are formed in the dust collection cover, and each of the attachment grooves includes: a first recess portion which opens at a front surface of the dust collection cover; a second recess portion which includes a stopper surface for supporting the engagement stop so as to be away from the first recess portion in a circumferential direction; and a guide recess portion which couples the first recess portion and the second recess portion to each other.   
     
     
         16 . The dust collection adapter according to  claim 12 , wherein
 a plurality of communication flow paths for communicating an inside of the skirt member and an outside thereof with each other are formed in the skirt member.   
     
     
         17 . The dust collection adapter according to  claim 16 , wherein
 each of the communication flow paths is inclined in a direction that an inner opening portion of each of the communication flow paths is shifted from an outer opening portion thereof in the rotational direction of the dust collection fan.   
     
     
         18 . The dust collection adapter according to  claim 15 , wherein
 the skirt member includes a plurality of sheet members which are held to the holder so that a downstream side thereof in the rotational direction of the dust collection fan is positioned diametrically inward, and an end portion of each of the sheet members in the circumferential direction overlaps with an end portion of the other sheet member adjacent thereto in the circumferential direction so as to sandwich a space therebetween, so that a communication flow path is formed by the space.   
     
     
         19 . A power tool which performs a grinding process to a material to be ground by a tip tool, comprising:
 a power tool main body to which a main body spindle for rotationally driving the tip tool is provided;   a dust collection fan which is rotationally driven by the main body spindle; and   a dust collection cover which is held to the power tool main body to contain the dust collection fan and which covers a diametrical outside of the tip tool,   the dust collection fan including: a fan main body having a plurality of blades; and a threaded shaft portion which is provided at a diametrical center portion of the fan main body and where a female thread portion thread-coupled to a male thread portion of the main body spindle is formed and where a male thread portion thread-coupled to a fastening member for fixing the tip tool is provided, and   dusts generated when a material to be ground is processed by the tip tool are sucked into the dust collection cover.   
     
     
         20 . The power tool according to  claim 19 , wherein
 the threaded shaft portion is an extension spindle portion which is detachably held to the fan main body and which extends the main body spindle.