GB1397543A - Blind riveting apparatus - Google Patents

Abstract

1397543 Blind rivetting AVDEL Ltd 26 May 1972 [28 May 1971] 18176/71 Heading B3U Blind riveting apparatus comprises abutment means 18, 20, a mandrel 12, first and second holding means 26, 28 and 30, 36 for holding the mandrel, the first holding means being reciprocable in a direction lengthwise of the mandrel to hold and move the mandrel between a rearward position, Fig. 2, in which the mandrel is held by the second holding means 30, 36 and a forward position, Fig. 1, in which the mandrel is disengaged from the second holding means, and means 42 for advancing a rivet forwardly along the mandrel from a position which is forwardly of the second holding means and which is rearwardly of the mandrel when the mandrel is in the forward position, wherein the first holding means and abutment means are operable to retract from the mandrel to allow a rivet to move forwardly along the mandrel. Actuation of the apparatus from the condition shown in Figs. 1 and 7, causes a ram 84 to move piston rod 90 and hence pulling jaws 26, 28 rearwardly, whilst the latter are gripping the mandrel until the mandrel head 16 has set the leading rivet 52 in a workpiece. During the setting of rivet 52 the rearward end of the mandrel passes through a fed river 54 and the rearwmost river 50 abuts a pivoted latch 44. When the mandrel reaches its rearmost position a ball 32 of detent 30 engages groove 36 in the mandrel and the jaws 26, 28, which are pivoted to the bifurcated end of the piston rod 90, begin to open, Fig. 2, due to the action of cam followers 140, 141, Fig. 7, on cams 144, 146. The rearward and opening movement of jaws 26, 28 continue, together with the simultaneous opening of jaws 38, 40, until the jaws 26, 28 reach their rearmost position. A stream of air is then delivered from jet 42 and drives the rivet 54 forwardly until it abuts the rearside of latch 44. The jaws 26, 28 now being to move forwardly and to close whilst the air stream is continued and, on reaching the head of the rivet 45, the jaws are closed sufficiently to move the rivet past the latch. At this stage a further rivet is fed to the jaws 38, 40 by a ram operated plunger. The jaws 26, 28 continue to move forwardly and eventually grip the mandrel. As the mandrel is moved forward the rivet 46 abuts and opens spring biased nose jaws 18, 20. The rivet 46 passes through the nose jaws, which close behind it, so that the apparatus is ready to commence a further cycle.