Patent ID: 6637099
Filing Date: 2003-10-28
Classification: B21J,F15B,Y10T

Abstract:
Pneumatic piston means for use in rivet feeding means in riveting apparatus having an elongated mandrel, and having an enlarged head at one end and loaded with a plurality of the tubular rivets forming a column of rivets on the mandrel, which is gripped by gripping means at or near the end remote from the head, and reciprocated relative to an abutment by relative reciprocation between the gripping means and the abutment, the rivets in the column being fed forwardly along the mandrel so that the leading rivet nearest the mandrel head is positioned between the mandrel head and the abutment and can then be set by moving the mandrel rearwardly relative to the abutment so as to draw the head of the mandrel through the bore of the rivet while the rivet is supported by the abutment, the piston means having a bore through which the mandrel extends, the mandrel having a radially enlarged part at a position on the mandrel remote from the head whereby the application of pneumatic pressure to one end of the piston means causes the piston to apply a thrust to the column of rivets thereby to feed the rivets forwardly along the mandrel as aforesaid, the part of the pneumatic piston means defining the bore being temporarily radially expandable, thereby to allow the passage through the bore of the radially enlarged part of the mandrel and to close again on to the mandrel after the passage of the enlarged part through the bore such that the piston is arranged to pass along the non-enlarged part of the mandrel whilst maintaining a fluid-tight seal with the mandrel.