Convertible lockbead-drawbead

Details Convertible lockbead-drawbead Convertible lockbead-drawbead

1990-06-13

1991-05-14

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72297, B21D 2404

Patent

active

050145371

ABSTRACT:
A bead structure for die binders which is easily convertible into either a drawbead structure or a lockbead structure includes a bead on one die binder having a generally planar roughened outer wall, a groove in the other binder, and a bead insert which is removably secured in the groove and includes a base of semi-rigid material and a series of segments secured to the base and having roughened outer walls juxtaposed to the roughened outer wall of the bead and providing a lockbead structure therewith when the binders close against a sheet metal blank. When the bead insert is removed, the bead and groove provide a drawbead structure. The sheet metal blank slides through the groove and over the roughened outer wall of the bead since the shoulders of the bead have a radius less than the radius of bending of the blank as it passes over the bead.

REFERENCES:
patent: 3299689 (1967-01-01), Dolney et al.
patent: 4195510 (1980-04-01), Juergens
patent: 4550585 (1985-11-01), Sasaki

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