Patent ID: 6029332
Filing Date: 2000-02-29
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;a toggle lever arrangement for driving said engaging means to said housing and said anvil so as to create a working stroke and a return stroke respectively, the toggle lever arrangement being movable from a first position at the beginning of said working stroke to a second position at the end of said working stroke, said toggle lever arrangement including a first pair of hand-drivable levers and a second pair of linking levers,each lever of said first pair having a distal end with a hand-hold and a proximal end with a first pivot means for being pivotally connected to one of said support means or said housing means, and with a second pivot means arranged in a short distance to said first pivot means,each said linking lever of said second pair having a first and a second end, said first end of each said linking lever being connected through a third pivot means to the other of said housing means or supporting means, said second end of each said linking lever being connected through each said second pivot means with one of said hand-drivable levers of said first pair, wherein the force transmission ratio of said toggle lever arrangement has a high value in said first position at the beginning of said working stroke and a lower value in said second position at the end of said working stroke.