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Information detector for a tire wheel

  • US 4,006,449 A
  • Filed: 07/08/1975
  • Issued: 02/01/1977
  • Est. Priority Date: 07/12/1974
  • Status: Expired due to Term
First Claim
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1. An information detector for a tire wheel comprising:

  • at least one coil mounted for rotation and being coiled about the circumference of the wheel, said coil being formed by parallel portions in a conductor which are doubled back so that said parallel portions are adjacent one another but are separated by a uniform space extending about the circumference of the wheel, said parallel portions on opposite sides of said space normally conducting in opposite directions;

    a detection means connected to said coil for rotation and arranged to vary electric conductivity of said coil for rotation in accordance with a parameter of the wheel;

    two fixed separate coils opposed in a gap to the parallel portions of said coil for rotation, the first of which is for electromagnetic coupling a signal to the coil for rotation and the second of which is for detecting the signal via electromagnetic coupling, with said coil for rotation, said fixed separate coils being positioned in close relation to said parallel portions and oriented such that their axes extend substantially through said uniform space;

    an oscillator arranged to supply said signals connected to the first fixed coil; and

    an indicating means having a circuit connected to the second fixed coil for treatment of the signal detected by said second fixed coil.

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