Method for threading closures
AssigneeEthyl Products Company
InventorRoderick V. King
Life of this patent
Estimating the term…
Abstract
A method and apparatus for threading a closure which includes securing the closure in a stationary nest, inserting a threading tool having threads on the outside thereof into the interior of the closure, moving the threading tool into contact with the interior portion of the closure upon which threads are to be formed, and moving the threading tool around the interior portion of the stationary closure in an orbital path to form threads in the closure without rotating the threading tool about the threading tool axis.
Claims9
A method of forming a spiral thread in the inturned curled edge provided at the lower end of the sidewall of a closure comprising:
- a. vertically lowering the closure until its shoulder makes contact with a shoulder provided on a cap nest carried by a fixed support member;
- b. vertically lowering a threading tool having at least one spiral thread on its exterior into the interior of the closure;
- c. supporting the upper portion of the sidewall of the closure with a fixed support member separate from the cap nest;
- d. transversely moving the threading tool so that the spiral thread contacts the inturned curled edge on the closure;
- e. moving the threading tool around the curled edge of the closure in an orbital path while restraining the threading tool against both rotational and longitudinal movement to form at least one spiral thread in the curled edge of the closure.
Dependencies are inferred from the claim text.