Patent ID: 6279371
Filing Date: 2001-08-28
Classification: B21J

Abstract:
A hand-held tool for forming a shop head on a plain end of a rivet, said hand-held tool including:an elongated handle having an elongated continuous internal cavity terminating at internal threaded end portions with a guide surface adjacent an end wall defined by a cup shaped insert with an upstanding threaded side wall engaged with one of said internal threaded end portions, said threaded side wall terminating at a planar wall which is coplanar with a terminal end of said elongated handle, said end wall having a predetermined thickness to establish a predetermined shop head thickness and containing an aperture having a predetermined diameter to house a volume of rivet material upset to form a shop head;an inertia block slidably guided by said internal guide surface for reciprocation between a displaced position remote from said end wall and a position for contact with said end wall; anda resilient member supported by said elongated handle for urging said inertia block against an end of a rivet when protruding from said aperture and arresting recoiling movement of said inertia block after impact with a rivet end in a direction away from said end wall.