| 摘要 |
A security tag, attachable to an article of merchandise by means of a tack received by the tag, includes means for sensing the presence of the head of the tack. The sensing means causes activation of an alarm circuit in response to displacement of the tack head relative to the tag resulting, for example, from an unauthorized attempt to withdraw the tack from the tag, or severance of the tack head. The tack may be coupled to the tag by means of a length of coaxial cable which may be used to attach the tag to an article to be safeguarded. The cable includes a pair of conductors normally insulated from each other. Contact between the conductors caused, for example, by an attempt to cut the cable, results in activation of the alarm circuit. |
