Fastening device suitable for use with needle detectors

Abstract

A fastening device designed to be suitably used with needle detectors. The fastening device does not trigger alarms from needle detectors. A fastening device comprises a frame having a plurality of metallic strips coupled contiguously to form an enclosure. The plurality of metallic strips are selected from a group of metallic materials having different ferromagnetic responses and at least two of said selected metallic strips have different ferromagnetic responses. Thereby when said fastening device is attached to a garment and said garment is passed through a needle detector, said fastening device does not trigger a false alarm from said needle detector. A tongue is further attached to the metallic strip.

What is claimed is: 
     
         1 . A fastening device comprising
 a frame comprising a plurality of metallic strips coupled contiguously to form an enclosure;   wherein said metallic strips are made out of materials selected from a group of metallic materials having different ferromagnetic responses and at least two of said selected metallic strips have different ferromagnetic responses;   thereby when said fastening device is attached to a garment and said garment is passed through a needle detector, said fastening device does not trigger a false alarm from said needle detector.   
     
     
         2 . The fastening device according to  claim 1 , wherein said metallic strips comprise a detachable rim and a U-shaped rim to form an enclosure enclosing a space therein for an object to pass through , wherein said detachable rim detachably coupled to said U-shaped rim. 
     
     
         3 . The fastening device according to  claim 2  wherein said U-shaped rim is made from said zinc alloy and said detachable rim is made from metallic materials selected from the group consisting of brass and copper. 
     
     
         4 . The fastening device according to  claim 3 , wherein a tongue is attached to said detachable rim of said fastening device frame. 
     
     
         5 . The fastening device according to  claim 4 , wherein said U-shaped rim comprises a pair of pins at its ends; and said detachable rim has a pair of holes at its ends to receive said pair of pins of said U-shaped rim when said detachable rim and said U-shaped rim are detachably coupled together. 
     
     
         6 . The fastening device according to  claim 5 , wherein said detachable rim is hollow or solid. 
     
     
         7 . The fastening device according to  claim 6 , wherein said detachable rim has a depression at the middle of it. 
     
     
         8 . The fastening device according to  claim 7 , wherein said tongue has a hook at one end; and said hook is rotatably attached to said detachable rim at said depression. 
     
     
         9 . The fastening device according to  claim 1 , wherein at least one insulating spacer is disposed in between said plurality of metallic strips. 
     
     
         10 . A buckle comprising
 a. a U-shaped rim made of a first metallic material having a first ferromagnetic response; and   b. a detachable rim made of a second metallic material having a second ferromagnetic response; said detachable rim being detachably coupled to said U-shaped rim to form an enclosure for a belt to pass through   thereby when said buckle is attached to a garment and said garment is passed through a needle detector, said buckle does not trigger a false alarm from said needle detector.   
     
     
         11 . The buckle according to  claim 10  further comprises a tongue being attached to said detachable rim. 
     
     
         12 . The buckle according to  claim 11  wherein said first metallic material is zinc alloy. 
     
     
         13 . The buckle according to  claim 12 , wherein said second metallic material is selected from the group consisting of brass and copper.