Wireless velocity detector for a bicycle having a rotating AC magnetic field and receiver coils
First Claim
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1. A system for measuring and displaying information related to the movement of a bicycle comprising:
- transmitter means secured to a wheel of said bicycle having a coil oriented generally along a longitudinal axis generally parallel to a plane of rotation of said wheel and a power source to generate a continuous rotating AC magnetic field which rotates at a rate proportional to the rotation of said wheel;
receiver means positioned on said bicycle, removed and electrically isolated from said transmitter means including at least two coils at a predetermined angle relative to each other such that said continuous rotating AC magnetic field passes through each of said coils, wherein each of said coils generates a continuous signal which strength is proportional to the strength of said magnetic field sensed by said coil;
means to convert said signals into selected data related to said movement of said bicycle; and
means to display selected portions of said data.
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Abstract
A wireless velocity detector for a bicycle includes a coil mounted on the wheel hub of the bicycle which generates a rotating magnetic field as the wheel rotates, a receiver mounted on the handlebars that includes a pair of coils that sense variations in the strength of the rotating field as the bicycle moves and generates signals in response to the field variations and a microprocessor which converts the signals into information related to the movement of the bicycle, e.g. speed and distance. A liquid crystal display is used to display the information to the cyclist.
118 Citations
26 Claims
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1. A system for measuring and displaying information related to the movement of a bicycle comprising:
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transmitter means secured to a wheel of said bicycle having a coil oriented generally along a longitudinal axis generally parallel to a plane of rotation of said wheel and a power source to generate a continuous rotating AC magnetic field which rotates at a rate proportional to the rotation of said wheel; receiver means positioned on said bicycle, removed and electrically isolated from said transmitter means including at least two coils at a predetermined angle relative to each other such that said continuous rotating AC magnetic field passes through each of said coils, wherein each of said coils generates a continuous signal which strength is proportional to the strength of said magnetic field sensed by said coil; means to convert said signals into selected data related to said movement of said bicycle; and means to display selected portions of said data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for measuring and displaying information related to the rotation of the shaft, comprising:
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transmitter means secured to a rotating shaft, including means to generate a continuous AC magnetic field which rotates with said shaft; receiver means positioned at a location removed and electrically isolated from said transmitter means, including at least two coils oriented at a predetermined angle relative to each other such that said continuous rotating AC magnetic field passes through each of said coils, wherein each of said coils generates a continuous signal which strength is proportional to the strength of said magnetic field sensed by said coil; means to convert said signals into selected data related to said shaft rotation; and means to display selected portions of said data.
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16. A method of measuring information related to the movement of a bicycle, comprising:
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energizing a magnetic field generator to generate a continuous AC magnetic field in response to rotation of a wheel of said bicycle; rotating said continuous AC magnetic field in a plane generally parallel to a plane of rotation of said wheel at a rate in proportion to the rotation of said wheel such that the strength of said AC magnetic field varies at a receiver position on said bicycle at a location spaced and electrically insulated from said field generator; positioning at least two coils oriented at a predetermined angle relative to each other at said receiver in a manner such that said rotating AC magnetic field passes through each of said coils; generating continuous signals at each of said coils which strength is proportional to the strength of said field passing through said coil in response to said continuous AC magnetic field; converting said signals into selected data related to the movement of said bicycle; and displaying selected portions of said data. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of measuring information related to the rotation of a shaft, comprising:
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generating a continuous AC magnetic field in response to rotation of a shaft; rotating said continuous AC magnetic field at a rate proportional to the rotation of said shaft; positioning at least two coils spaced from and electrically insulated from said shaft, said coils being oriented at a predetermined angle relative to each other in manner such that said continuous rotating AC magnetic field passes through each of said coils; generating continuous signals at each of said coils which strength is proportional to the strength of said field passing through said coil in response to said rotating continuous AC magnetic field; converting said signals into selected data related to said rotation of said shaft; and displaying selected portions of said data.
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Specification