Tire pressure monitor
First Claim
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1. A device for indicating abnormal pressure in a tire provided with a pressure valve, the device comprising:
- a hollow housing detachably mountable on the tire pressure valve, said housing defining a pressure chamber, said pressure chamber being in direct fluid communication with the tire pressure valve when the housing is mounted on the tire pressure valve;
a spring-operated pressure sensor mounted in the housing, said pressure sensor comprising a compression spring, a lid mounted above the compression spring, said lid allowing calibration of the pressure sensor for low pressure settings, and a sliding plate mounted in contact with the compression spring opposite said lid, said sliding plate allowing calibration of the pressure sensor for high pressure settings;
an inflatable sleeve mounted within said housing in contact with said lid for communicating tire pressure to said pressure sensor; and
a means operationally connected to the pressure sensor for visually displaying a condition in the tire pressure which is below or above the acceptable level.
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Abstract
A tire pressure indicator has a spring-operated sensor mounted in an air chamber of a housing that attaches to a tire pressure valve. Indicator has adjustment screws, accessible from the exterior of the housing, for setting the sensor to a low level of acceptable tire pressure and a high level of acceptable tire pressure. When the pressure level outside of the set limits is detected, a bicolor light emitting diode provides a warning to a driver.
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Citations
16 Claims
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1. A device for indicating abnormal pressure in a tire provided with a pressure valve, the device comprising:
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a hollow housing detachably mountable on the tire pressure valve, said housing defining a pressure chamber, said pressure chamber being in direct fluid communication with the tire pressure valve when the housing is mounted on the tire pressure valve;
a spring-operated pressure sensor mounted in the housing, said pressure sensor comprising a compression spring, a lid mounted above the compression spring, said lid allowing calibration of the pressure sensor for low pressure settings, and a sliding plate mounted in contact with the compression spring opposite said lid, said sliding plate allowing calibration of the pressure sensor for high pressure settings;an inflatable sleeve mounted within said housing in contact with said lid for communicating tire pressure to said pressure sensor; and a means operationally connected to the pressure sensor for visually displaying a condition in the tire pressure which is below or above the acceptable level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for indicating abnormal pressure in a tire provided with a pressure valve, the device comprising:
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a hollow housing detachably mountable on the tire pressure valve, said housing defining a pressure chamber, said pressure chamber fluidly communicating with the tire pressure valve when the housing is mounted on the tire; a spring-operated pressure sensor mounted in the housing, said pressure sensor comprising a compression spring mounted in a compartment within said housing, said compartment having a lid above said compression spring;
a sliding plate mounted in said housing below said compression spring, said plate sliding to establish an electrical contact with said lid when an abnormal tire pressure is detected;an inflatable sleeve mounted above said lid for exerting a downward pressure on said compression spring, said sleeve being filled with air from the tire when said housing is mounted on said tire; a means extending into the pressure chamber for adjusting the pressure sensor to a low level of acceptable tire pressure; a means extending into the pressure chamber for adjusting the pressure censor to a high level of acceptable tire pressure; and a means operationally connected to the pressure censor for visually displaying a condition in the tire pressure which is below or above the acceptable level. - View Dependent Claims (10, 11, 12, 13, 15)
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14. A device for indicating abnormal pressure in a tire provided with a pressure valve, the device comprising:
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a hollow housing detachably mountable on the tire pressure valve, said housing defining a pressure chamber, said pressure chamber fluidly communicating with the tire pressure valve when the housing is mounted on the tire, said pressure sensor comprising a printed circuit board, a compression spring secured on said printed circuit board by an adjustment screw extending transversely through said printed circuit board and a contact plate extending in a substantially parallel relationship to said printed circuit board, said contact plate being carried by said adjustment screw in abutting relationship to said compression spring; a means extending into the pressure chamber for adjusting the pressure sensor to a low level of acceptable tire pressure, said means for adjusting the pressure sensor to a low pressure level comprising a first contact member secured to said printed circuit board adjacent a first end of said contact plate, said first contact member establishing an electrical contact with said contact plate and said display means when the tire pressure drops below a pre-determined level and the contact plate moves into a contact with the first contact member; a means extending into the pressure chamber for adjusting the pressure sensor to a high level of acceptable tire pressure, said means for adjusting pressure sensor to a high pressure level comprises a second contact member secured to said printed board adjacent a second end of said contact plate, said second contact member establishing an electrical connection with said contact plate and said display means when the tire pressure exceeds a pre-determined level and the contact plate moves into a contact with the second contact member; and a means operationally connected to the pressure sensor for visually displaying a condition in the tire pressure which is below or above the acceptable level. - View Dependent Claims (16)
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Specification