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Antitheft device

  • US 5,077,872 A
  • Filed: 08/10/1990
  • Issued: 01/07/1992
  • Est. Priority Date: 08/10/1990
  • Status: Expired due to Fees
First Claim
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1. An antitheft device for marking an article for sale, the device comprising:

  • first and second members, interlock means on the members for automatically interlocking a portion of the first member in a first cavity (30) having an axis in the second member, the interlocking means comprising a rod-shaped body (22b) with an at least partially pointed insertion end on the first member for engaging balls loosely arranged radially about the first cavity (30) of the second member, a third member of magnetizable material in the first cavity (30) axially of the loosely arranged balls, a resilient member in the first cavity for providing a driving force to the third member toward the balls, the resilient member being an annular plastic member with inward connecting parts connected to a centrally arranged disk-shaped plastic member for pressing against the third member in the first cavity (30), and an additional cavity (30a) in the second member around the first cavity (30), wherein the second member comprises a shell (28) having the additional cavity (30a) and a closure member (29) on the shell (28) for closing the additional cavity (30a) of the shell (28), the closure member (29) providing the first cavity (30) and having a cover (31) for closing the first cavity (30), the closure member (29) having weakened portion means for breaking if a tool is inserted between the first and the second members when interlocked, whereby a liquid in the additional cavity (30a) can be released.

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