Patent ID: 7059594

Claim:
A workpiece support comprising: a rod; a sleeve body externally fitted on the rod and elastically deformable so as to shrink in diameter; a case member supporting the sleeve body; a scraper externally fitted on the rod and retained at the case member for scraping debris adhering to the external peripheral surface of the rod when the rod is retracted; an external peripheral hydraulic chamber formed on the external periphery of the sleeve body; an oil passage for supplying oil pressure to the external peripheral hydraulic chamber; an air passage formed between the rod and the internal peripheral surface of the sleeve body and connected to the gap between the rod and the scraper; a plurality of air nozzles formed in an end portion of the case member so as to connect with the air passage, the plurality of air nozzles forming a curtain of compressed air so as to cover the external periphery of the rod protruding outside said end of the case member; and an air input port for supplying compressed air to the air passage.