Method for making a break-away container closure
AssigneeTBL Development Corporation
InventorsEdward J. Towns, Edward M. Brown
Life of this patent
Estimating the term…
Abstract
Break-away closures are formed by an injection molding process with a closure part in interference path with a forming core for interference in use with a counterpart surface of a container neck. The process and apparatus disclosed permits stripping of the formed closure from the core by selectively creating free encircling space about the interference closure part for expansion thereof during stripping. The closure has detent surface molded therein which assists the stripping operation and the process and apparatus provide for the application of stripping forces at spaced locations simultaneously to permit stripping of the closure in part without axial loading thereof.
Claims10
A method for making a generally cylindrical break-away closure having an upper interiorly threaded portion, a frangible section depending from said upper portion and a separable portion depending axially from said frangible section, said method comprising the steps of:
- (a) defining a first mold cavity conforming to the exterior of said closure upper portion;
- (b) defining a second mold cavity conforming to the exterior of said closure frangible section and separable portion;
- (c) configuring a core with exterior surface forming such interior thread, forming ribs and open spaces between said ribs in said frangible section and forming said separable portion, such core surface being shaped to provide said separable portion with an axial extent and a radially interiorly extending ledge inclined relative to the axis of said closure and adapted to interfere with a container;
- (d) disposing said core in said first and second mold cavities;
- (e) injecting closure-forming matter into said first and second mold cavities to form a closure on said core;
- (f) creating free space in said second mold cavity radially outwardly of the frangible section and separable portion of a formed such closure;
- and
- (g) stripping said closure from said core in part by displacing said axial extent of said separable portion into said free space created in said step (f) upon radially outward displacement of said ledge by said core.
A method for making a break-away closure having an upper interiorly threaded portion, a frangible section depending from said upper portion and a separable portion depending axially from said frangible section, said method comprising the steps of:
- (a) defining a first mold cavity conforming to the exterior of said closure upper portion;
- (b) defining a second mold cavity conforming to the exterior of said closure frangible section and separable portion;
- (c) disposing in said first and second mold cavities a core having exterior surface conforming to the interior of said closure, such core surface being inclusive of a surface portion forming ribs and open spaces between said ribs in said frangible section;
- (d) injecting closure-forming matter into said first and second mold cavities to form a closure on said core;
- and
- (e) creating free space in said second mold cavity at the location of the frangible section and separable portion of a formed such closure radially outwardly of the radially outwardmost dimension of said core;
- and
- (f) stripping said closure from said core in part by displacing said separable portion into said free space created in said step (e).
Dependencies are inferred from the claim text.