Snap-on, screw-off cap and container neck

  • US 5,687,866 A
  • Filed: 06/28/1996
  • Issued: 11/18/1997
  • Est. Priority Date: 08/09/1990
  • Status: Expired due to Fees
First Claim
Patent Images

1. In combination, a container having a neck and a container closure,said neck having an upper opening, a downward extending neck stretch below said opening, said neck stretch having an exterior, a plurality of first helical engagement means formed around said exterior of said neck stretch, and first tamper-evidencing means on said neck,said closure having a top, a downward extending upper skin portion depending from said top adapted to fit over said neck stretch, said upper skirt portion having an interior, a plurality of second helical engagement means formed around said interior of said upper skirt portion shaped to mate with said at least one first helical engagement means, and second tamper-evidencing means,said first and second helical engagement means being interengaged to secure said closure in sealing engagement with said neck, said first and second helical engagement means being of sufficient length around said exterior of said neck stretch and said interior of said upper skin portion, respectively, to provide at least 400°

  • of thread engagement,said first and second helical engagement means being shaped and said closure being resilient so that upon application of force to accomplish direct, axial movement of said closure relative to said container without externally imposed relative rotation of said closure and said neck, said first and second helical engagement means slip past each other and then interengage and said closure seats on and sealingly engages said neck so that said closure cannot be removed from said neck without unscrewing said closure,said second tamper-evidencing means being frangible, said first tamper-evidencing means having a plurality of first teeth, said second tamper-evidencing means having a plurality of second teeth, at least one of said first teeth and said second teeth having a guiding surface shaped for guiding said teeth into side by side interengagement upon contact with the other of said at least one of said first teeth and said second teeth during said direct axial movement.

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