Communications: electrical – Selective – Having indication or alarm
Patent
1981-05-26
1983-10-11
Trafton, David L.
Communications: electrical
Selective
Having indication or alarm
731465, 34087031, B60C 2302
Patent
active
044095864
ABSTRACT:
A tire condition monitor converter including a plurality of wires extending about a tire rim and defining a first coil electrically connected to a first capacitor to define a first LC circuit and a second coil electrically connected to a second capacitor to define a second LC circuit. A mounting ring of electrically insulating material extends about the rim and has grooves therein in which the wires are disposed. A yieldable material is disposed between the ring and the rim for allowing radial expansion and contraction of the ring and rim while maintaining the circumferential length of the wires constant. A connecting block is disposed between the terminal ends of the mounting ring and the wires are connected to the block to place the wires in tension. The block includes circuit means for electrically interconnecting the ends of the respective wires and also supports the capacitors. A pressure switch is disposed in the circuit and is responsive to tire pressure. A diode interconnects the two LC circuits and the second LC circuit is resonant at a frequency which is a harmonic of the first frequency to which the first LC circuit is resonant. Also disclosed is an exciter coil assembly which establishes a magnetic field at a frequency to which the first LC circuit is resonant. The exciter coil assembly includes a core with a winding supported within a shield for limiting E-field propagation.
REFERENCES:
patent: 3662335 (1972-05-01), Fritze
patent: 3806905 (1974-04-01), Strenglein
patent: 3858174 (1974-12-01), Harris
patent: 4006449 (1977-02-01), Sumi
patent: 4074227 (1978-02-01), Kalmus
patent: 4174515 (1979-11-01), Marzolf
Milton Jr. Harold W.
Nowicki Joseph
Trafton David L.
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