| 摘要 |
Tamper indicating closure device for securely sealing a container in the form of a clear cap and indicator element. The cap includes knife blades in the form of ramp shaped projections which extend from the bottom side of the cap surface. Each knife blade is radially offset from the center of the cap and extends generally parallel to the radius of the cap terminating in a generally vertical planner knife face that extends in an axial direction. A tamper indicating element including a first covering layer and a second color layer is inserted into the cap prior to securing the cap and indicating element to a container. When the cap is screwed onto the container, the ramp like shape of the knife blades cause the knife blades to pass over the indicating element without tearing or piercing. When the cap is removed from a secured relationship with the container, the generally vertical knife face tears the cover layer of the indicating element exposing the color layer and thereby providing an indication of tampering. Because the knife blades do not pierce the indicating element during assembly, a sealing layer may be used to protect the contents of a container from the atmosphere without the need to flatten knife blades or apply sealant thereto to avoid the possible piercing of the sealing layer during assembly.
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