1479375 Riveting GESIPA BLINDNETTECHNIK GmbH 21 May 1975 [25 May 1974(2)] 21708/75 Heading B3U In a blind riveting tool, a draw body 29 of a mandrel gripping chuck 30 is movable to set a blind rivet by a lever 27 which is pivotally mounted at 26 in the tool housing 1 and which carries a roller 28 acted upon by pneumatic piston and cylinder units 2, 6 connected in series. In operation, a lever 24 of a control valve 18 is swivelled to allow compressed air in the valve 18, introduced through a connection 51, to escape to atmosphere, whereupon a valve member 34 is moved to the left by a spring 46. In this position of the value 18, compressed air can flow via a bore 54 into a chamber 15 of a first piston and cylinder unit 2, 6 and then into second and third piston and cylinder units 2, 6 by flowing through passages 13 and along a channel 12 between a rod 5 and sleeves 7 holding the pistons 6 together. The pistons 6 and rod 5 are thereby moved to the left to cause the rod 5 to pivot a two armed double lever 27 about an axis 26 whereby the draw body 29, which is pivotally connected to the lever 27, is moved against spring bias 31 to set a blind rivet. When the lever 24 is released, the valve member 34 is forced to the right by the compressed air flowing through the connection 51 to allow the air to enter the chamber 55 in front of the first piston 6 which together with the other two connected pistons 6 is returned to the initial position.
展开▼
