Tapered container and method and apparatus for forming same
AssigneeRedicon Corporation
InventorsJoseph D. Bulso, Jr., Stephen D. Doyle
Life of this patent
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Abstract
A method and apparatus for forming nestable two-piece containers includes forming a cup from a metal blank; redrawing the cup thus formed to approximately one-half its final height while imparting a tapered sidewall thereto by use of a tapered die center; redrawing the container thus formed to its full height while continuing the taper by use of a second tapered die center while simultaneously profiling the bottom of the container thus drawn. The apparatus includes at least two redraw stations, each including a tapered redraw die center and corresponding die. The second of said stations also includes bottom profiling tooling.
Claims12
A method of forming a wrinkle free tapered container from a thin metal blank in a double acting press having inner and outer rams, comprising the steps of:
- (A) forming the blank into a cup with an integral bottom surface;
- (B) holding the cup with tooling carried by the outer ram;
- (C) partially forming said held cup with tooling carried by the inner ram by drawing it to a partial height while imparting a tapered configuration to the portion thus drawn;
- and
- (D) holding the cup with tooling carried by the outer ram;
- (E) finally forming said held cup by drawing it to a final height with tooling carried by the inner ram and imparting a tapered configuration to the portion thus drawn.
Apparatus for imparting a tapered sidewall to a drawn container formed from a thin metal cup having a flange at its open end in a double acting press having inner and outer rams, comprising:
- (A) a first redraw station including
- (1) a first die,
- (2) a first tapered redraw punch carried by the inner ram and movable toward and away from said die, and
- (3) pressure means carried by the outer ram for engaging the flange of the cup and holding the cup as said punch moves into drawing engagement therewith;
- (B) said first tapered redraw punch being movable toward said first die sufficient distance to draw the cup to approximately one-half its final height;
- (C) a second redraw station including
- (1) a second die,
- (2) a second tapered redraw punch carried by the inner ram and movable toward and away from said die, and
- (3) pressure means carried by the outer ram for engaging the flange of the cup and holding the container as said punch moves into drawing engagement therewith;
- (D) said second tapered redraw punch being movable toward said second die sufficient distance to draw the cup to its final height and form a container.
Dependencies are inferred from the claim text.