Crown cap fabrication method

Abstract

The first step is positioning a first die adjacent to the intermediate extent, the first die having a first radius of curvature, the first die being positioned adjacent to the free edge. The next step is activating the first die to create a primary curl in the intermediate extent. The next step is positioning a second die adjacent to the intermediate extent, the second die having a second radius of curvature, the second die being positioned adjacent to the primary curl. The last step is activating the second die to create a secondary curl.

Claims

1. A crown cap fabrication method comprising the steps of: positioning a first die adjacent to an intermediate extent of a crown cap, the first die having a first radius of curvature, the first die being positioned adjacent to a free edge of the crown cap; activating the first die to create a primary curl in the intermediate extent; positioning a second die adjacent to the intermediate extent, the second die having a second radius of curvature, the second die being positioned adjacent to the primary curl; and activating the second die to create a secondary curl.

2. The system as set forth in claim 1 and further including the step of: positioning a third die adjacent to the intermediate extent, the third die having a third radius of curvature, the third die being positioned adjacent to the secondary curl; and activating the third die to create a tertiary curl.

3. The system as set forth in claim 2 wherein the third radius of curvature and the second radius of curvature is greater than the first radius of curvature.

4. The system as set forth in claim 1 wherein dies are curl dies.

5. A method for curling the free end of a crown cap for increased stability comprising the steps of: providing the crown cap, the crown cap having an imperforate cover in a circular configuration, the crown cap having a free edge, the crown cap having an intermediate extent of 6 millimeters between the imperforate cover and the free edge; positioning a first male die on the inside of the intermediate extent and positioning a first female die on the outside of the intermediate extent facing the first male die, the first male and female dies having a curvature of 30 degrees, plus or minus 10 percent, the first male and female dies being positioned to contact the intermediate extent from the free edge; pressing together the first male and female dies to create a primary curl; positioning a second male die on the inside of the intermediate extent and positioning a second female die on the outside of the intermediate extent facing the second male die, the second male and female dies having a radius of curvature of 90 degrees, plus or minus 10 percent, the second male and female dies being positioned to contact the intermediate extent from the primary curl; pressing together the second male and female dies to create a secondary curl; positioning a third male die on the inside of the intermediate extent and positioning a third female die on the outside of the intermediate extent facing the third male die, the third male and female dies having a curvature of 270 degrees, plus or minus 10 percent; pressing together the third male and female dies to create a tertiary curl, the primary and secondary and tertiary curls together exceeding 360 degrees; and crimping the crown cap with the curled free edge onto a bottle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will be better understood and objects other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:

(2) FIG. 1 is a cross sectional view of a portion of a crown cap prior to performing the primary method curling step of the present invention.

(3) FIG. 2 is a cross sectional view of a portion of the crown after performing the secondary curling step of the present invention.

(4) FIG. 3 is a cross sectional view of a portion of the crown cap of FIG. 2 after performing the tertiary curling step of the present invention.

(5) FIG. 4 is a perspective illustration of a crown cap with the curl on the free end prior to crimping onto a bottle.

(6) The same reference numerals refer to the same parts throughout the various Figures.

DESCRIPTION OF THE PREFERRED EMBODIMENT

(7) With reference now to the drawings, and in particular to FIG. 1 thereof, the preferred embodiment of the new and improved crown cap fabrication method embodying the principles and concepts of the present invention and generally designated by the reference numeral 10 will be described.

(8) The present invention, the crown cap method is comprised of a plurality of steps. Such steps in their broadest context include successively curling intermediate sections of a crown cap to create a curl in excess of 360 degrees. Such steps are individually configured and correlated with respect to each other so as to attain the desired objective.

(9) From a specific perspective, the invention of the present application is a method for curling the free end of a crown cap 10 for increased stability. The method includes plural steps.

(10) The first step is providing the crown cap 10. The crown cap has an imperforate cover 12 in a circular configuration. The crown cap has a free edge 14. The crown cap has an intermediate extent 16 of 6 millimeters, plus or minus 10 percent, between the imperforate cover and the free edge.

(11) The next step is positioning a first male die 20 on the inside of the intermediate extent and positioning a first female die 22 on the outside of the intermediate extent facing the first male die. The first male and female dies have a curvature of 30 degrees, plus or minus 10 percent. The first male and female dies are positioned to contact 6 millimeters, plus or minus 10 percent, to the intermediate extent from the free edge.

(12) The next step is pressing together the first male and female dies to create a primary curl 24.

(13) The next step is positioning a second male die 28 on the inside of the intermediate extent and positioning a second female die 30 on the outside of the intermediate extent facing the second male die. The second male and female dies have a curvature of 90 degrees, plus or minus 10 percent. The second male and female dies are positioned to contact the intermediate extent from the primary curl.

(14) The next step is pressing together the second male and female dies to create a secondary curl 32.

(15) The next step is positioning a third male die 36 on the inside of the intermediate extent and positioning a third female die 38 on the outside of the intermediate extent facing the third male die. The third male and female dies have a curvature of 270 degrees, plus or minus 10 percent. The third male and female dies are positioned to contact the intermediate component from the secondary curl.

(16) The next step is pressing together the third male and female dies to create a tertiary curl 40. The primary and secondary and tertiary curls together exceed 380 degrees.

(17) The final method step is crimping the crown cap with the curled free edge onto a bottle.

(18) The preferred die is a curl die.

(19) As to the manner of usage and operation of the present invention, the same should be apparent from the above description. Accordingly, no further discussion relating to the manner of usage and operation will be provided.

(20) With respect to the above description then, it is to be realized that the optimum dimensional relationships for the parts of the invention, to include variations in size, materials, shape, form, function and manner of operation, assembly and use, are deemed readily apparent and obvious to one skilled in the art, and all equivalent relationships to those illustrated in the drawings and described in the SPECIFICATION are intended to be encompassed by the present invention.

(21) Therefore, the foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.