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Identification device for a pneumatic spring

  • US 8,866,591 B2
  • Filed: 03/24/2011
  • Issued: 10/21/2014
  • Est. Priority Date: 09/25/2008
  • Status: Active Grant
First Claim
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1. A pneumatic spring comprising:

  • a roll-off piston;

    a cover;

    a rolling-lobe flexible member having a predetermined length and having a first end connected to said cover and a second end connected to said roll-off piston;

    said rolling-lobe flexible member being subject to less stress in terms of deformation of said rolling-lobe flexible member at a location in close proximity to said cover than elsewhere along said predetermined length thereof;

    said rolling-lobe flexible member having an elastomer matrix;

    an unencapsulated transmit memory device embedded in said elastomer matrix of said rolling-lobe flexible member while unvulcanized and at said location and being configured as a radio frequency identification transponder (RFID transponder);

    a read unit operatively connected to said RFID transponder and being configured to generate an electromagnetic field;

    said RFID transponder being configured to draw energy necessary to supply said RFID transponder from said electromagnetic field; and

    ,said RFID transponder being so configured that when said energy is available to said RFID transponder information is exchanged between said RFID transponder and said read unit.

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