Tire pressure monitoring device
OwnerTorbjörn Boson Lundqvistinventor
Life of this patent
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Abstract
A low tire pressure monitoring device that is affixed to a tire valve stem and methods of using the same. The monitoring device comprises a housing having a counter-pressure chamber, a main pressure chamber, and a flexible membrane that separates the two chambers. The monitoring device is calibrated by trapping the tire's initial air pressure in the counter-pressure chamber. The air pressure within the main pressure chamber is equivalent to the air pressure within the tire. Over the course of time, the air pressure within the tire and concomitantly the air pressure within the main pressure chamber decreases. When the pressure in the counter-pressure is greater than the pressure within the main pressure chamber, the flexible membrane touches and completes an electrical circuit and a warning signal is emitted.
Claims27
A tire pressure monitoring device for monitoring tire pressure, said monitoring device comprising:
- a housing having a first pressure chamber, a second pressure chamber;
- and a flexible membrane, wherein said first and second pressure chambers are separated by a flexible membrane, wherein the first pressure chamber is calibrated with air from a tire;
- and
- a signaling means for emitting a warning signal when a pressure within the first pressure chamber is greater than a pressure within the second pressure chamber;
- wherein the housing is adapted to be mounted onto a tire stem.
- said housing having a first pressure chamber, a second pressure chamber, and a flexible membrane, wherein said first and second pressure chambers are separated by a flexible membrane;
- and
- a signaling means located within said housing, wherein said signaling means emits a warning signal when a pressure within the first pressure chamber is greater than a pressure within the second pressure chamber.
A valve cap having an interior air pressure supplied through a conventional tire valve, said valve cap comprising:
- a transparent top;
- a light emitting diode (LED) attached to a printed circuit board;
- an upper housing coupled to a lower housing, the upper housing which accommodates the LED, the printed circuit board, and a flexible membrane;
- a counter-pressure chamber, wherein the counter-pressure chamber is a space between the transparent top and the flexible membrane;
- a main pressure chamber, wherein the main pressure chamber is a space between the flexible membrane and the lower housing,
- the counter-pressure chamber having a first open mode wherein the counter-pressure chamber is in atmospheric communication with the main pressure chamber, and the counter-pressure chamber having a second closed mode wherein the counter-pressure chamber is sealed from the main pressure chamber;
- at least one battery located within the upper housing;
- and
- the lower housing which is internally threaded to mate with a tire valve assembly.
A tire pressure monitoring device for monitoring tire pressure, said monitoring device comprising:
- a housing having a first pressure chamber in communication with a second pressure chamber, wherein the first pressure chamber having a first open mode wherein the first pressure chamber is in atmospheric communication with the second pressure chamber, and the first pressure chamber having a second closed mode wherein the first pressure chamber is sealed from the second pressure chamber;
- and
- a flexible membrane positioned between the first pressure chamber and the second pressure chamber.
A tire pressure monitoring device comprising:
- means for mounting the device onto a tire stem;
- means for calibrating the device to air pressure in the tire at an initial point in time with air from within the tire;
- means for indicating at a subsequent point in time that air pressure in the tire has decreased beyond a pre-determined pressure difference, as compared to the pressure in the tire at said initial point in time.
A tire pressure monitoring device comprising:
- a housing having a first pressure chamber in communication with a second pressure chamber, wherein the first pressure chamber having a first open mode wherein the first pressure chamber is in atmospheric communication with the second pressure chamber, and the first pressure chamber having a second closed mode wherein the first pressure chamber is sealed from the second pressure chamber;
- and
- a flexible membrane positioned between the first pressure chamber and the second pressure chamber;
- and
- a signaling means for emitting a warning signal when a pressure within the first pressure chamber is greater than a pressure within the second pressure chamber;
- wherein the housing is adapted to be mounted onto a tire stem.
A tire pressure monitoring device attachable to a tire valve for monitoring tire pressure, said tire pressure monitoring device comprising:
- a housing including a means for calibrating said pressure monitoring device with air from a tire, a means for sensing a pressure differential, and a means for signaling said pressure differential.
Dependencies are inferred from the claim text.