Patent ID: 6223409
Filing Date: 2001-05-01
Classification: B21J,B25B,Y10T

Abstract:
A rivet setting tool comprising;means for engaging a rivet having a thin walled sleeve portion and a nut with an internal thread, said engaging means having a threaded portion to threadingly engage said nut of the rivet;housing means including an anvil for supporting said rivet when the rivet setting tool is in operation;means for slidably supporting said engaging means relative to said housing means;means for driving said engaging means relative to said housing and anvil so as to make working strokes and return strokes respectively,said driving means including a pneumatic cylinder having a double acting piston,said piston dividing said pneumatic cylinder into first and second chambers,said first chamber being impinged by pressure supplied thereto during the working stroke and said second chamber being impinged by pressure during the return stroke,said first chamber also including a spring which is biased during said return stroke and develops a decreasing force during said working stroke.