Patent ID: 8251781

Claim:
A sander comprising: a main body in which a motor is housed; a rectangular plate provided below the main body and configured to move in a circular motion on a flat plane when the motor is driven; and a pair of clamp devices provided at opposite side surfaces of the plate, each clamp device being configured to be capable of clamping one end portion of a sanding sheet to be positioned on a bottom surface of the plate, wherein the clamp device comprises: a clamp body having a clamp strip extending along the side surface of the plate and configured to be slidable on the plate between a clamping position where the clamp strip contacts with the side surface and an unclamping position where the clamp strip is away from the side surface; a support shaft provided on the plate at a position close to the clamp body and extending in a vertical direction; an operating member having a first end, a second end, and an intermediate portion positioned between the first end and the second end and rotatably connected to the support shaft, the first end being a connecting end connected to the clamp body, and the second end being folded back at the support shaft and being an operating end extending above the clamp body, so that the operating member is elastically deformable in an expanding and contracting directions as seen from top between the connecting end and the operating end; and an engagement member provided on the plate opposite to the support shaft with the clamp body interposed therebetween, and configured to be engageable with the operating end of the operating member while the intermediate portion is being compressed, wherein while the end portion of the sanding sheet is positioned between the clamp strip and the side surface of the plate, the operating end is brought into engagement with the engagement member so that the intermediate portion is compressed and the clamp body connected to the connecting end is urged from the unclamping position to the clamping position to thereby secure the end portion under pressure between the clamp strip and the side surface of the plate.