Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1993-07-02
1994-11-08
Jones, David
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
72313, B21D 504
Patent
active
053616200
ABSTRACT:
A hemming device comprises a partly cylindrical member rotatably disposed in a partly cylindrical channel of a housing block. The partly cylindrical member includes an outer surface comprising an arcuate surface portion and a planar surface portion. The housing block is disposed in a press. A sheet of metal having an upset edge to be hemmed to positioned with the edge on the planar surface which is set to an initial position. A striker is attached to a press platen of the press, whereby when the press is lowered the striker contacts the sheet forcing it against the planar surface which cause the edge to bend to an obtuse angle. As the striker continues to move downwardly, the striker contacts the partly cylindrical member (i.e., the rocker) causing it to rotate thereby further bending the edge of the sheet until a hem is formed thereat.
REFERENCES:
patent: 2963066 (1960-12-01), Nelson
patent: 4002049 (1977-01-01), Randolph, Sr.
patent: 4181002 (1980-01-01), Eckhold et al.
patent: 4434644 (1984-03-01), Gargrove et al.
Ready Tools-Dayton, Ohio Classified Bend Design Notes, Jan. 1991, Catalog 452B.
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