Patent ID: 7290428
Filing Date: 2007-11-06
Classification: B21D

Abstract:
1. A can bottom forming assembly for forming the bottom of a can body and for attachment to a bodymaker having a punch, said bottom forming assembly comprising: a) a housing assembly having an outer housing, a cylinder housing and a cover chamber; b) a clamp ring retainer assembly having biasing means to float a clamp ring, wherein said clamp ring retainer assembly is constructed and arranged to be partially positioned within said outer housing; c) a clamp ring and a domer die plug for contact with the can body; d) a piston assembly having a transfer piston assembly, push rods and an end piston assembly, wherein said transfer piston is positioned for sliding engagement within said outer housing and wherein said end piston assembly is positioned for sliding engagement within said cylinder housing and wherein said domer die plug is in communication with said transfer piston assembly; e) a spring member constructed and arranged for placement between said transfer piston assembly and said end piston assembly and wherein said push rods extend through said spring member and are constructed and arranged for sliding engagement in said spring member; and f) means to attach the can bottom forming assembly to a bodymaker assembly.