×

Walk-through metal detector

  • US 4,906,973 A
  • Filed: 04/29/1988
  • Issued: 03/06/1990
  • Est. Priority Date: 04/29/1988
  • Status: Expired due to Fees
First Claim
Patent Images

1. A walk-through metal detector, comprising:

  • (a) transmit coil means for generating an electromagnetic field;

    (b) receive coil means for sensing changes in said electromagnetic field, and generating an output signal representative of said changes;

    (c) circuit means for selectively processing said output signal to detect the presence of metal within said electromagnetic field;

    (d) coil support means for supporting said transmit and receive coil means, said coil support means having an aperture therethrough of size sufficient to enable a person to walk therethrough; and

    (e) outer shell means surrounding said coil support means for protecting said coil support means from physical contact, said outer shell means being spaced apart from said coil support means and mechanically decoupled therefrom.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×