Patent ID: 6405421
Filing Date: 2002-06-18
Classification: B21J,Y10T

Abstract:
A die assembly for riveting comprising:an upper die comprising a fixing block and at least one pressing protrusion next to the fixing block, a first slanted surface being formed at the end of the pressing protrusion; a base die comprising sizing block cooperating with the fixing block adapted to position a workpiece, and at least one supporting block beside the sizing block; at least one clamp movably attached to the supporting block for pressing the workpiece, the clamp comprising a second slanted surface corresponding to the first slanted surface of the pressing protrusion whereby each clamp is movable from a first position to a second position by the pressing protrusion; and at least one elastic member connected to the clamp whereby each clamp is returnable from the second position to the first position by the elastic member.