Sander

Abstract

The sander includes a sanding part having a planar sheet placement surface on which a sanding sheet can be set, and a clamping mechanism configured to hold the sanding sheet on the sanding part. The clamping mechanism includes a clamping part configured to hold the sanding sheet and to be slid in a direction parallel to the sheet placement surface between a closed position to hold the sanding sheet and an open position to allow removal of the sanding sheet, an elastic element that applies a biasing force of biasing the clamping part toward the closed position, in a direction parallel to the sheet placement surface, and a holding mechanism configured to hold the clamping part in the open position against the biasing force. The clamping part is allowed to hold the sanding sheet when the holding mechanism is released from holding the clamping part in the open position.

1 . A sander, comprising:
 a sanding part having a planar sheet placement surface on which a sanding sheet can be set; and   at least one clamping mechanism configured to hold the sanding sheet on the sanding part, wherein:   the at least one clamping mechanism includes:
 a clamping part that is configured to hold the sanding sheet and to be slid in a direction parallel to the sheet placement surface between a closed position to hold the sanding sheet on a side surface of the sanding part and an open position to allow removal of the sanding sheet; 
 at least one elastic element that applies a biasing force of biasing the clamping part toward the closed position, in a direction parallel to the sheet placement surface; and 
 a holding mechanism that is configured to hold the clamping part in the open position against the biasing force, and 
   the clamping part is allowed to hold the sanding sheet when the holding mechanism is released from holding the clamping part in the open position.   
     
     
         2 . The sander as defined in  claim 1 , further comprising an elongate handle,
 wherein:   a direction orthogonal to the sheet placement surface defines an up-down direction of the sander,   a direction in which the handle extends when viewed from the up-down direction defines a front-rear direction of the sander,   the at least one clamping mechanism includes:
 a front clamping mechanism arranged frontward of a center of the sanding part; and 
 a rear clamping mechanism arranged rearward of the center of the sanding part. 
   
     
     
         3 . The sander as defined in  claim 1 , wherein:
 each of the at least one elastic element is an elongate spring, and   the elongate spring extends in a direction parallel to the sheet placement surface.   
     
     
         4 . The sander as defined in  claim 1 , wherein each of the at least one elastic element is an elongate compression spring. 
     
     
         5 . The sander as defined in  claim 1 , wherein the holding mechanism includes a cam part that abuts on the clamping part and presses the clamping part toward the open position by rotating in an opening direction. 
     
     
         6 . The sander as defined in  claim 5 , wherein:
 the cam part allows the clamping part to slide to the closed position by rotating in a closing direction opposite to the opening direction, and   the holding mechanism includes a stopper that stops rotation of the cam part in the opening direction in a position where a sliding width of the clamping part toward the open position is maximized or starts decreasing after being maximized.   
     
     
         7 . The sander as defined in  claim 5 , wherein:
 the holding mechanism further includes a lever part that is configured to be manipulated to rotate the cam part, and   an outer contour of the lever part is located inward of an outer contour of the sheet placement surface in a surface direction when the clamping part is in the closed position.   
     
     
         8 . The sander as defined in  claim 5 , further comprising:
 a suction part that sucks sanding dust generated from a workpiece by sanding with the sander; and   a dust collecting nozzle that discharges the sucked sanding dust rearward in the sander,   wherein:   the at least one clamping mechanism includes a rear clamping mechanism arranged rearward of the center of the sanding part,   the rear clamping mechanism is arranged in a region under the dust collecting nozzle,   the holding mechanism further includes a lever part that is operated to rotate the cam part,   the lever part has a part having a height increasing upward in a direction away from a rotational axis of the cam part, and   a highest part of the lever part has such a height as to avoid contact with the dust collecting nozzle when the cam part is rotated.   
     
     
         9 . The sander as defined in  claim 4 , wherein:
 the sanding part includes at least one housing part that houses the compression spring, and   each of the at least one housing part has a shorter length than a natural length of the compression spring in an extending direction of the compression spring.   
     
     
         10 . The sander as defined in  claim 9 , wherein the clamping part is configured to cover an upper side of the compression spring housed in the at least one housing part. 
     
     
         11 . The sander as defined in  claim 4 , wherein:
 the holding mechanism includes:
 a cam part that abuts on the clamping part and presses the clamping part toward the open position by rotating in an opening direction, and 
 a lever part that is operated to rotate the cam part, and 
   an outer contour of the lever part is located inward of an outer contour of the sheet placement surface in a surface direction when the clamping part is in the closed position.   
     
     
         12 . The sander as defined in  claim 4 , comprising:
 a suction part that sucks sanding dust generated from a workpiece by sanding with the sander, and   a dust collecting nozzle that discharges the sucked sanding dust rearward in the sander,   wherein:   the at least one clamping mechanism includes a rear clamping mechanism arranged rearward of the center of the sanding part,   the rear clamping mechanism is arranged in a region under the dust collecting nozzle,   the holding mechanism includes:
 a cam part that abuts on the clamping part and presses the clamping part toward the open position by rotating in an opening direction, and 
 a lever part that is operated to rotate the cam part, 
   the lever part has a part having a height increasing upward in a direction away from a rotational axis of the cam part, and   a highest part of the lever part has such a height as to avoid contact with the dust collecting nozzle when the cam part is rotated.   
     
     
         13 . The sander as defined in  claim 1 , wherein:
 the holding mechanism includes a cam part that abuts on the clamping part and presses the clamping part toward the open position by rotating in an opening direction,   the clamping part includes:
 at least one spring contact part to which the biasing force is applied from the at least one elastic element, 
 a cam contact part that abuts on the cam part and transmits a rotational force applied to the cam part to the clamping part, and 
 a sheet contact part that holds the sanding sheet between the sheet contact part and the sanding part. 
   
     
     
         14 . The sander as defined in  claim 13 , wherein:
 the sheet contact part has an end part that is bent toward a side surface part of the sanding part,   the end part of the sheet contact part is located outward of an outer contour of the sheet placement surface in a surface direction, and in the closed position, presses the side surface part by the biasing force and clamps the sanding sheet between the end part of the sheet contact part and the side surface part.   
     
     
         15 . The sander as defined in  claim 14 , wherein a groove is formed in the side surface part and configured to receive the end part of the sheet contact part in the closed position.