Forming small diameter opening for aerosol, screw cap, or crown cap by multistage necking-in of drawn or drawn and ironed container body
Patent 3995572 Issued on December 7, 1976. Estimated Expiration Date: 
December 7, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 7, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 865257 2337182 3196819 3812696 3820486 InventorAssigneeApplicationNo. 490277 filed on 07/22/1974US Classes:72/348With additional metal-deformingExaminersPrimary: Hall, Carl E.Attorney, Agent or FirmInternational ClassB21D 51/26 (20060101)AbstractMethod and apparatus for producing a novel one piece, unitary, seamless can body with a reduced diameter opening for receiving an aerosol device or other small diameter closure. A truncated conical configuration portion is formed from sidewall metal in a sequence of operations in which an extended-length reduced-diameter neck is formed with a curvilinear transition zone leading to the main body sidewall portion. A portion of this reduced diameter neck is then further reduced in diameter, and this sequence continued, until the desired size opening is achieved and flanging metal provided for an aerosol device or other small diameter closure. Selection of dimensional parameters and percentage reductions provides for: smooth transition to smaller diameters, maintaining circular configuration, ease of removal of dies permitting operations from one longitudinal end of a can body, and maintaining substantially the original can body height. | |
