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Safety closure with nested caps

  • US 4,609,114 A
  • Filed: 04/23/1985
  • Issued: 09/02/1986
  • Est. Priority Date: 04/23/1985
  • Status: Expired due to Term
First Claim
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1. A safety closure for a container comprising:

  • an inner cap having a rigid, non-deformable, planar upper end and a generally cylindrical skirt with a smooth outer surface, the inner surface of the skirt being adapted to be threadably secured on the container for effecting the closure thereof;

    an outer cap coaxially aligned with and generally overlapping the inner cap, the outer cap having a resilient, planar upper end and a generally cylindrical skirt with a smooth inner surface;

    inter-engageable unidirectional drive means disposed on the inner side of the upper end of the outer cap and on the outer side of the upper end of the inner cap and encircling a central planar portion of the inner and outer caps about the axis of the closure to drive the inner cap in a closing direction upon depression and simultaneous turning movement of the central portion of the end of the outer cap;

    selectively engageable drive means disposed at the peripheries of the inner side of the upper end of the outer cap and the outer side of the upper end of the inner cap and extending radially outwardly to the skirts of the caps, such selectively engageable drive means being engageable only upon deformation of the peripheral region of the resilient upper end of the outer cap and operable upon a simultaneous turning movement of the outer cap in the opening direction to unthread the inner cap from the container,said inter-engageable drive means engaging a planar surface of the opposing cap and spacing said central planar portions of said end walls of said caps from one another.

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