Apparatus for forming tall tapered containers
AssigneeRedicon Corporation
InventorsJoseph D. Bulso, Jr., James A. McClung
Life of this patent
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Abstract
A method of forming a tapered container in which the container is first redrawn to a partial length having first and second straight sidewall portions interconnected by a transition position and then redrawn to substantially its final length and tapered condition by drawing material from the transition portion. The method also optionally includes an overlength second redraw and a bottom profiling step utilizing the overdrawn portion to form the profile. The apparatus includes a plurality of stations wherein the redrawing is accomplished in the first instance with a tapered punch and straight walled die and in the second instance with a tapered punch and tapered die.
Claims10
Apparatus for forming a tapered container from a preformed cup, comprising:
- (A) at a first station, a die having a substantially straight walled cavity;
- (B) a die center having a tapered periphery;
- (C) a fluidly actuated pressure sleeve movable toward and away from said die;
- (D) said pressure sleeve engaging the bottom of the cup upon movement toward said die;
- (E) said die center being movable toward said die to engage the cup and draw the same, in cooperation with said die, into a partial length container having first and second substantially straight sidewall portions interconnected by a transition portion;
- (F) at a second station, a second die having a substantially straight walled cavity;
- (G) a second die center having a tapered periphery and being movable toward said second die to further elongate said container while maintaining said first and second substantially straight sidewall portions and at least a part of said transition portion;
- (H) at a third station, a third die having a tapered die cavity;
- and
- (I) a third die center having a tapered periphery and being movable toward said third die to further elongate said container and impart a taper to the sidewall thereof.
Apparatus for forming a tapered container from a blank of material, comprising:
- (A) at a first station, a fixed redraw die;
- (B) a blank and draw punch, movable toward and away from said redraw die;
- (C) a die center movable toward and away from said redraw die;
- (D) said blank and draw punch wiping the blank over the top of the redraw die upon movement toward said redraw die to form an inverted cup;
- (E) said die center engaging said inverted cup and reverse drawing the same upon movement toward said redraw die;
- (F) said redraw die being hollow whereby said reverse drawn cup may be removed from the die through the die;
- (G) at a second station, a die having a substantially straight walled cavity;
- (H) a die center having a tapered periphery;
- (I) a fluidly actuated pressure sleeve movable toward and away from said die;
- (J) said pressure sleeve engaging the bottom of the cup upon movement toward said die;
- (K) said die center being movable toward said die to engage the cup and draw the same, in cooperation with said die, into a partial length container having first and second substantially straight sidewall portions interconnected by a transition portion;
- (L) at a third station, a third die having a substantially straight walled cavity;
- (M) a third die center having a tapered periphery and being movable toward said third die to further elongate said container while maintaining said first and second substantially straight sidewall portions and at least a part of said transition portion;
- (N) at a fourth station, a fourth die having a tapered die cavity;
- and
- (O) a fourth die center having a tapered periphery and being movable toward said fourth die to further elongate said container and impart a taper to the sidewall thereof.
Dependencies are inferred from the claim text.