Patent ID: 8740203

Claim:
A clamp apparatus comprising: a clamp arm, one end portion of which is exposed from an opening of a casing, and another end portion of which is accommodated inside the casing; a support shaft that pivotally supports the other end portion of the clamp arm at an interior of the casing; a cylinder having a rod that is connected to the clamp arm through a toggle link mechanism arranged in the interior of the casing, and which causes the clamp arm to swing about the support shaft by converting linear movement of the rod into rotational movement through the toggle link mechanism; a first scraper disposed on the casing: a second scraper that is separate from the first scraper and disposed on the casing separately from the first scraper, wherein an arcuate portion is formed on the clamp arm and is curved about the support shaft, and the arcuate portion is exposed to an exterior of the casing when the clamp arm swings so as to clamp a workpiece, whereas the arcuate portion is accommodated inside the casing when the clamp arm swings so as to release the workpiece, wherein another arcuate portion is formed on the clamp arm and is curved about the support shaft, and the other arcuate portion is accommodated inside the casing when the clamp arm swings so as to clamp the workpiece, whereas the other arcuate portion is exposed to the exterior of the casing when the clamp arm swings so as to release the workpiece, wherein the first scraper is in sliding contact against an arcuate surface of the arcuate portion when the clamp arm swings, and wherein the second scraper is in sliding contact against an arcuate surface of the other arcuate portion when the clamp arm swings.