Belt sander

Abstract

A belt sander includes a motor driven by power supplied from a battery, a battery mounting portion to which the battery is removably mountable, and a belt driving portion including (i) a drive roller to be rotated by a driving force of the motor, (ii) a driven roller, and (iii) a belt that is stretched over the drive roller and the driven roller and has a polishing surface that polishes a workpiece. The belt sander is provided with a housing including a motor housing portion housing the motor, and with a handle disposed to surround at least a part of the battery mounted to the battery mounting portion.

1 . A belt sander comprising:
 a motor driven by power supplied from a battery;   a battery mounting portion to which the battery is removably mountable;   a belt driving portion including (i) a drive roller to be rotated by a driving force of the motor, (ii) a driven roller, and (iii) a belt stretched over the drive roller and the driven roller and having a polishing surface for polishing a workpiece;   a housing including a motor housing portion housing the motor; and   a handle disposed to surround at least a part of the battery mounted to the battery mounting portion.   
     
     
         2 . The belt sander according to  claim 1 , wherein
 the housing further includes (i) a bottom portion on which the belt driving portion is disposed, (ii) an upper surface portion on an opposite side from the bottom portion, (iii) a first side surface portion positioned between the bottom portion and the upper surface portion, and (iv) a second side surface portion on an opposite side from the first side surface portion,   the handle includes (i) a first extension portion coupled to the first side surface portion, (ii) a second extension portion coupled to the second side surface portion, and (iii) a grip portion connecting the first extension portion and the second extension portion, and   in a side view of the belt sander, the first extension portion and the second extension portion overlap at least a part of the battery mounted to the battery mounting portion.   
     
     
         3 . The belt sander according to  claim 2 , wherein
 the handle further includes:
 a first coupling portion rotatably coupling the first extension portion and the first side surface portion; and 
 a second coupling portion rotatably coupling the second extension portion and the second side surface portion, 
   the handle is rotatable within a range of predetermined rotation angles, and   in a side view of the belt sander, regardless of a rotation position at which the handle is disposed within the range, the first extension portion and the second extension portion overlap at least a part of the battery mounted to the battery mounting portion.   
     
     
         4 . The belt sander according to  claim 3 , wherein
 the handle further includes a mounting/removal operation portion configured to move the first coupling portion in a first direction toward the first side surface portion along a rotational axis of the handle, and a second direction separating from the first side surface portion, and   the mounting/removal operation portion is configured to switch a state of the handle to (i) a rotation suppressed state in which rotation of the handle is suppressed, by moving in the first direction to cause the first coupling portion to be clamped between the mounting/removal operation portion and the first side surface portion, and (ii) to a rotatable state in which the handle is rotatable, by moving in the second direction to allow the first coupling portion to be spaced apart from the first side surface portion.   
     
     
         5 . The belt sander according to  claim 4 , further comprising:
 a shaft portion inserted through the first coupling portion and the second coupling portion and defining the rotational axis of the handle, wherein   the first coupling portion includes a coupling engagement portion having a protruding shape or a recessed shape,   the shaft portion includes a shaft engagement portion having a recessed shape or a protruding shape corresponding to the coupling engagement portion,   the mounting/removal operation portion is fixed to an end portion of the shaft portion, and is configured to move the shaft portion in the first direction and the second direction, and   when the shaft portion moves in the second direction and the coupling engagement portion reaches a predetermined restriction position on the shaft portion, the shaft portion is restricted from moving further in the second direction as a result of engagement between the shaft engagement portion and the coupling engagement portion.   
     
     
         6 . The belt sander according to  claim 5 , wherein
 the coupling engagement portion is a tab portion having a protruding shape protruding toward the shaft portion from a wall surface of a through hole, of the first coupling portion, through which the shaft portion is inserted,   the shaft engagement portion is a shaft recess portion having a recessed shape whose shaft diameter is narrower than other sections of the shaft portion, and   the shaft portion is restricted from moving in the second direction by the tab portion being engaged with the shaft recess portion when the tab portion is at the restriction position.   
     
     
         7 . The belt sander according to  claim 6 , wherein
 the first side surface portion includes a restraint portion that houses the tab portion engaged with the shaft recess portion when the tab portion is at the restriction position, in a state of being adjacent to the back surface of the tab portion.   
     
     
         8 . The belt sander according to  claim 2 , wherein
 a first one of the first extension portion and the second extension portion is formed integrally with the grip portion, using a synthetic resin,   a second one of the first extension portion and the second extension portion is formed using metal,   the second one of the extension portions includes a first section extending from a coupling position with the housing, and a second section curving from the first section toward the grip portion, and   the second section is disposed inside the grip portion.   
     
     
         9 . The belt sander according to  claim 2 , further comprising:
 a drive transmitting portion that transmits the driving force of the motor to the drive roller, wherein   the first extension portion is formed using a synthetic resin,   the second extension portion is formed using metal, and   the drive transmitting portion is provided at the first side surface portion.   
     
     
         10 . The belt sander according to  claim 3 , wherein
 the handle is configured to be fixed at a position such that at least a part of the grip portion is in the same plane as the upper surface portion.   
     
     
         11 . The belt sander according to  claim 1 , wherein
 in a plan view of the belt sander, at least a part of the battery mounting portion overlaps at least a part of the polishing surface.   
     
     
         12 . A belt sander comprising:
 a motor driven by power supplied from a battery;   a battery mounting portion to which the battery is removably mountable;   a belt driving portion including (i) a drive roller to be rotated by a driving force of the motor, (ii) a driven roller, and (iii) a belt stretched over the drive roller and the driven roller and having a polishing surface for polishing a workpiece;   a housing including (i) a bottom portion on which the belt driving portion is disposed, (ii) an upper surface portion on an opposite side from the bottom portion, (iii) a first side surface portion positioned between the bottom portion and the upper surface portion, (iv) a second side surface portion on an opposite side from the first side surface portion, and (v) a motor housing portion housing the motor;   a handle including (i) a first extension portion coupled to the first side surface portion, (ii) a second extension portion coupled to the second side surface portion, and (iii) a grip portion connecting the first extension portion and the second extension portion; and   a drive transmitting portion that is provided at the first side surface portion and that transmits the driving force of the motor to the drive roller, wherein   the handle is disposed to surround at least a part of the battery mounted to the battery mounting portion, and   a cross-sectional width of the second extension portion is narrower than a cross-sectional width of the first extension portion.   
     
     
         13 . A belt sander comprising:
 a motor driven by power supplied from a battery;   a battery mounting portion to which the battery is removably mountable;   a first handle;   a second handle disposed to surround at least a part of the battery mounted to the battery mounting portion;   a belt driving portion including (i) a drive roller to be rotated by a driving force of the motor, (ii) a driven roller, and (iii) a belt stretched over the drive roller and the driven roller and having as a polishing surface for polishing a workpiece; and   a housing including (i) a motor housing portion housing the motor, (ii) a bottom portion on which the belt driving portion is disposed, (iii) an upper surface portion on an opposite side from the bottom portion, (iv) and a back surface portion on an opposite side from the second handle with the motor housing portion interposed therebetween, wherein   the first handle includes (i) an upper base connected at a position, of the rear surface portion, close to the upper surface portion, (ii) a lower base connected at a position, of the rear surface portion, close to the belt driving portion, and (iii) a first grip portion extending between and connecting the upper base and the lower base,   in a side view of the belt sander, an extending direction of the first grip portion is inclined at a predetermined inclination angle with respect to the polishing surface, in a manner that an upper side of the first grip portion is closer to the rear surface portion than a lower side of the first grip portion, and   the inclination angle is in a range from 30 degrees to 50 degrees.   
     
     
         14 . The belt sander according to  claim 13 , wherein
 the first handle further includes a switch trigger to be manually operated for switching the motor on and off, the switch trigger being provided at a position, of the first grip portion, facing the rear surface portion,   the switch trigger includes a trigger main body having a trigger surface to be touched by a finger of a user during operation of the trigger main body, and   in a side view of the belt sander, the extending direction is defined by a tangent line of the first handle at an intersection point between a back surface of the first handle and a bisector, the bisector being perpendicular to a straight line joining an upper end and a lower end of the trigger surface exposed to the outside of the belt sander when the switch trigger is not being operated.   
     
     
         15 . The belt sander according to  claim 13 , wherein
 the first handle further includes a switch trigger, provided at a position, of the first grip portion, facing the rear surface portion,   the switch trigger includes a trigger main body having (i) a trigger bottom portion having a circular arc shape in a side view of the belt sander and (ii) a trigger surface to be touched by a finger of a user during operation of the trigger main body, and   in a side view of the belt sander, the extending direction is defined by a first tangent line of the first handle at an intersection point between a back surface of the first handle and a second tangent line of the trigger bottom portion when the switch trigger is not being operated, the second tangent line passing through a rotational axis of a first one of the drive roller and the driven roller, the first one being closer to the first handle than a second one of the drive roller and the driven roller.   
     
     
         16 . The belt sander according to  claim 13 , wherein
 in a side view of the belt sander, the extending direction is defined by a tangent line of the first handle at an intersection point between a back surface of the first handle and a straight line, the straight line (i) passing through a rotational axis of a first one of the drive roller and the driven roller and (ii) forming an acute angle of 55 degrees with the polishing surface, the first one being closer to the first handle than a second one of the drive roller and the driven roller.   
     
     
         17 . A belt sander comprising:
 a motor driven by power supplied from a battery;   a battery mounting portion to which the battery is removably mountable;   a first handle;   a second handle disposed to surround at least a part of the battery mounted to the battery mounting portion;   a belt driving portion including (i) a drive roller to be rotated by a driving force of the motor, (ii) a driven roller, and (iii) a belt stretched over the drive roller and the driven roller and functioning as a polishing surface for polishing a workpiece; and   a housing including (i) a motor housing portion housing the motor, (ii) a bottom portion on which the belt driving portion is disposed, (iii) an upper surface portion on an opposite side from the bottom portion, and (iv) a back surface portion on an opposite side from the second handle with the motor housing portion interposed therebetween, wherein   the first handle includes (i) an upper base connected at a position, of the rear surface portion, close to the upper surface portion, (ii) a lower base connected at a position, of the rear surface portion, close to the belt driving portion, (iii) a first grip portion extending between and connecting the upper base and the lower base, and (iv) a switch trigger to be manually operated for switching the motor on and off, the switch trigger being provided at a position, of the first grip portion, facing the rear surface portion, and   in a side view of the belt sander, a normal line with respect to an extending direction of the first grip portion passes through a position (i) on an opposite side, of the first grip portion, from the switch trigger, and (ii) between a rotational axis of the drive roller and a rotational axis of the driven roller.   
     
     
         18 . The belt sander according to  claim 17 , wherein
 in a side view of the belt sander, the normal line intersects the polishing surface.