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Anti - Theft Device

  • US 20020024440A1
  • Filed: 08/13/2001
  • Published: 02/28/2002
  • Est. Priority Date: 08/31/2000
  • Status: Active Grant
First Claim
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1. An antitheft device comprising a tag (10) for performing a theft preventing function upon an escape from a specified control area, and an attaching member (2) for attaching the tag (10) to a commodity (9), the attaching member (2) comprising a button (22), and a pin (21) projecting from the button (22) and movable into a housing (1) of the tag (10) through a pinhole (12a) formed in the housing (1), the tag housing (1) having arranged therein a clamp member (3) for clamping the pin (21) of the attaching member (2) as moved in through the pinhole (12a), an on-off switch (8) to be depressed by the button (22) of the attaching member (2), and a theft alarm operable under the control of on-off signals from the on-off switch (8), the clamp member (3) having a clamp portion (34) for the pin (21) of the attaching member (2) to be inserted therethrough for clamping the pin (21) unremovably, the clamp member (3) being rotatably supported by a pivot provided inside the housing (1), permitting the clamp portion (34) to be disengaged from the pin (21) when rotated in one direction and being given an elastic repulsive force against the rotation, the housing (1) being provided with an inlet passage (14) for an unclamping probe (7) for pushing the clamp member (3) into rotation toward said one direction, the on-off switch (8) comprising an actuator (82) having an outer end projecting outward from the housing (1) through a hole (12b) formed in the hosuing (1), and a cylindrical guide portion (83) formed around a base end portion of the actuator (82) and providing the pivot for the clamp member (3).

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