Tire pressure indicator
First Claim
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1. A tire pressure indicator for a set of pneumatic tires of a vehicle, each of the pneumatic tires having a metal wheel, said tire pressure indicator comprising:
- a plurality of pressure gauges, each of which includes a casing formed with an aperture and adapted to be secured to the metal wheel of a respective one of the pneumatic tires such that said pressure gauges are concealed by the pneumatic tires, and a signal generating device disposed in said casings said signal generating device wirelessly transmitting a pressure signal when pressure within the respective one of the pneumatic tires is not within a predetermined normal operating pressure range;
a receiver device for receiving the pressure signal transmitted by said signal generating device of said pressure gauges;
a pressure sensing unit which generates an analog voltage signal that varies in accordance with the pressure entering said aperture;
a signal converting unit electrically connected to said pressure sensing unit for converting the analog voltage signal into a digital output signal;
an encoder unit electrically connected to said signal converting unit, said encoder unit comparing the digital output signal of said signal converting unit with high pressure and low pressure limits of the normal operating pressure and low pressure limits of the normal operating pressure range, said encoder unit generating said pressure signal which includes the digital output signal and an identification code unique to that gauge when the digital output signal is not within the normal operating pressure range; and
a signal transmitter circuit electrically connected to said encoder unit for transmitting the pressure signal from said encoder unit wirelessly.
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Abstract
A pressure gauge of a tire pressure indicator for a set of pneumatic tires of a vehicle includes a casing formed with an aperture and adapted to be secured to a metal wheel of a respective one of the pneumatic tires such that the casing is concealed by the respective one of the pneumatic tires, and a signal generating device disposed in the casing. The signal generating device wirelessly transmits a pressure signal when pressure within the respective one of the pneumatic tires is not within a predetermined normal operating pressure range.
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Citations
18 Claims
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1. A tire pressure indicator for a set of pneumatic tires of a vehicle, each of the pneumatic tires having a metal wheel, said tire pressure indicator comprising:
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a plurality of pressure gauges, each of which includes a casing formed with an aperture and adapted to be secured to the metal wheel of a respective one of the pneumatic tires such that said pressure gauges are concealed by the pneumatic tires, and a signal generating device disposed in said casings said signal generating device wirelessly transmitting a pressure signal when pressure within the respective one of the pneumatic tires is not within a predetermined normal operating pressure range; a receiver device for receiving the pressure signal transmitted by said signal generating device of said pressure gauges; a pressure sensing unit which generates an analog voltage signal that varies in accordance with the pressure entering said aperture; a signal converting unit electrically connected to said pressure sensing unit for converting the analog voltage signal into a digital output signal; an encoder unit electrically connected to said signal converting unit, said encoder unit comparing the digital output signal of said signal converting unit with high pressure and low pressure limits of the normal operating pressure and low pressure limits of the normal operating pressure range, said encoder unit generating said pressure signal which includes the digital output signal and an identification code unique to that gauge when the digital output signal is not within the normal operating pressure range; and a signal transmitter circuit electrically connected to said encoder unit for transmitting the pressure signal from said encoder unit wirelessly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A pressure gauge for a pneumatic tire with a metal wheel comprising:
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a casing formed with an aperture and adapted to be secured to the metal wheel of the pneumatic tire such that said casing is concealed by the pneumatic tire; a signal generating device disposed in said casing, said signal generating device wirelessly transmitting a pressure signal when pressure within the pneumatic tire is not within a predetermined normal operating pressure range; a pressure sensing unit which generates an analog voltage signal that varies in accordance with the pressure entering said aperture; a signal converting unit electrically connected to said pressure sensing unit for converting the analog voltage signal into a digital output signal; an encoder unit electrically connected to said signal converting unit, said encoder unit comparing the digital output signal of said signal converting unit with high pressure and low pressure limits of the normal operating pressure range, said encoder unit generating said pressure signal which includes the digital output signal and an identification code unique to that gauge when the digital output signal is not within the normal operating pressure range; a signal transmitter circuit electrically connected to said encoder unit for transmitting the pressure signal from said encoder unit wirelessly. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification