| 摘要 |
A setting apparatus (1) for setting a blind nut or the like to a workpiece comprises a mandrel (7), a hydraulic cylinder (17) receiving therein a hydraulic piston (15) for axially pulling the mandrel (7), an oil reservoir (22) for containing oil to be supplied to the hydraulic cylinder (17), and an air cylinder (27) for receiving therein an air piston (26) connected to a ram (25) adapted to be reciprocatingly advanced and retracted in the oil reservoir (22). In response to the compressed air supplied to the air cylinder, the hydraulic piston (15) is moved to pull the mandrel (7), whereby a fastener threadedly connected with the mandrel is set to a workpiece. The setting apparatus (1) also includes an air-pressure setting valve (33) for adjustably presetting the air pressure of the compressed air to be supplied to the air cylinder (27). When the air pressure in said air cylinder reaches the preset air pressure level, the air-pressure setting valve (33) is operated to feed the compressed air from the air cylinder to completion valve activation assembly (13) so that a completion valve (11) is activated to stop the movement of the air piston (26) to prevent the mandrel (7) from being pulled. Such a setting apparatus allows a nut-type fastener such as a blind nut to be properly set to a workpiece by only a single adjustment irrespective of the variation in thickness of the workpiece. <IMAGE> |
