| 摘要 |
A card retention assembly (10) includes a shield (12) and a retraction mechanism (14). The shield (12) is essentially non-transmissive of radio frequency signals and encloses a card receptacle (22) which retains an RFID card (20) when the retraction mechanism (14) is in a retracted position. The retraction mechanism (14) includes a spool and a retention line (16) connectable to the RFID card (20) and connected to the spool. Manually withdrawing the RFID card (20) from the card receptacle (22) causes the retention line (16) to unwind from the spool and transitions the retraction mechanism (14) from the retracted position to an extended position. The retraction mechanism (14) is biased to the retracted position causing the retention line to wind back onto the spool and automatically returning the RFID card back to the card receptacle (22) when the RFID card (20) is manually released. Radio frequency communication between the RFID card (20) and a proximal card reader is prevented when the RFID card (20) is within the card receptacle (22) and is permitted when the RFID card (20) is outside the card receptacle (22).
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