초록 ▼

A tamper indicating closure including an outer cap and an inner liner which relies on relative movement of the outer cap and the inner liner during opening movement to indicate tampering of the container after it has been sealed for the first time, the relative movement being insured by a means whic

A tamper indicating closure including an outer cap and an inner liner which relies on relative movement of the outer cap and the inner liner during opening movement to indicate tampering of the container after it has been sealed for the first time, the relative movement being insured by a means which coact with the container to resist rotation of the liner and maintain the container in a sealed condition while the outer cap is being rotated in an opening direction. Once opened, the outer cap and the inner liner are maintained in a position for movement as a unit in both the opening and closing direction of the closure.

대표청구항 ▼

A tamper indicating closure for containers having threaded necks forming an opening, comprising: a cup shaped cap member having internal threads to engage with threads on said neck of said container, a liner member supported by said cap member for rotation relative thereto, said liner member having

A tamper indicating closure for containers having threaded necks forming an opening, comprising: a cup shaped cap member having internal threads to engage with threads on said neck of said container, a liner member supported by said cap member for rotation relative thereto, said liner member having an annular flange with a radially outwardly facing cylindrical friction surface for engagement with a complementary surface on the inner wall of said opening in said neck, said liner member forming adjoining first and second sectors, a window in said cap member alignable with said first sector indicating an initially closed condition or with said second sector indicating that said closure has been opened, cooperating drive means including a drive lug on one of said members engageable with driven surfaces on the other of said members, said driven surfaces including a first surface engaged by said lug when said window is in alignment with said first sector upon initial rotational movement of said cap and liner member as a unit in a closing direction in which said liner member is movable axially in a seated position relative to the neck of said container, a second surface engageable by said lug following movement of said cap member in an opening direction relative to said liner member during which said friction surface remains seated and said window moves into alignment with said second sector after which said cap and liner members are moveable as a unit to remove said friction surface from its said seated position, a third surface between said first and second surfaces, said second and third surfaces being engageable by said lug when said window is aligned with said second sector for rotation of said cap and liner member as a unit for all subsequent movements of said closure in a closing or opening direction, a cam surface associated with said third surface to deflect said lug axially to pass to a position between said second and third surfaces while said friction surface remains seated, the resistance to axial displacement of said lug being less than the resistance to rotation and axial movement of said friction surface from the seated position.