Tire deflation warning apparatus
First Claim
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1. A tire deflation warning apparatus for use with a tire having an inflation chamber, said apparatus comprising:
- a pressure-responsive device comprising;
a tubular housing having an internal surface;
a piston mounted in said housing for sliding movement therein, said piston having an external surface;
a pressure chamber defined by and between said internal surface of said housing and said external surface of said piston;
said housing having a port therein for operative connection to the inflation chamber of the tire whereby the pressure of air in the tire at normal operating pressure can urge the piston to move in a given direction and relative to the housing;
a conduit for fluidly connecting said port to the inflation chamber;
means for biasing the piston in a direction opposite to said given direction; and
magnetic means arranged for operation to actuate a warning switch by movement of said piston in said opposite direction, said magnetic means comprising a push rod adapted for attachment to a wheel axle of a vehicle, said push rod being coaxial with said piston and being axially movable in response to movement of said piston in said opposite direction one axial end of said push rod being closer to the housing than the other axial end thereof, and a permanent magnet carried by said other end of said push rod; and
a keep magnet for holding said piston and said push rod together in contact for movement in unison.
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Abstract
Tire deflation warning apparatus comprising a tubular housing having a sliding piston, a port in the housing for connection to the inflation chamber of the tire whereby the pressure of air in the tire at normal operating pressure can urge the piston to move relatively to the housing, biasing means associated with the piston in opposition to the air, and magnetic means operated by movement of the piston to actuate a warning switch.
14 Citations
6 Claims
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1. A tire deflation warning apparatus for use with a tire having an inflation chamber, said apparatus comprising:
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a pressure-responsive device comprising; a tubular housing having an internal surface; a piston mounted in said housing for sliding movement therein, said piston having an external surface; a pressure chamber defined by and between said internal surface of said housing and said external surface of said piston; said housing having a port therein for operative connection to the inflation chamber of the tire whereby the pressure of air in the tire at normal operating pressure can urge the piston to move in a given direction and relative to the housing; a conduit for fluidly connecting said port to the inflation chamber; means for biasing the piston in a direction opposite to said given direction; and magnetic means arranged for operation to actuate a warning switch by movement of said piston in said opposite direction, said magnetic means comprising a push rod adapted for attachment to a wheel axle of a vehicle, said push rod being coaxial with said piston and being axially movable in response to movement of said piston in said opposite direction one axial end of said push rod being closer to the housing than the other axial end thereof, and a permanent magnet carried by said other end of said push rod; and a keep magnet for holding said piston and said push rod together in contact for movement in unison. - View Dependent Claims (2, 3, 4, 5)
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6. In combination, a vehicle wheel, a pneumatic tire defining an inflation chamber with said wheel, and a tire deflation warning apparatus, said apparatus comprising:
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a pressure-responsive device mounted on the vehicle wheel, said device comprising; a tubular housing having an internal surface; a piston mounted in said housing for sliding movement therein, said piston having an external surface; a pressure chamber defined by and between said internal surface of said housing and said external surface of said piston; said housing having a port therein for operative connection to the inflation chamber of the tire whereby the pressure of air in the tire at normal operating pressure can urge the piston to move in a given direction and relative to the housing; a conduit fluidly connecting said port to the inflation chamber; means for biasing the piston in a direction opposite to said given direction; and magnetic means arranged for operation to actuate a warning switch by movement of said piston in said opposite direction, said magnetic means comprising a push rod adapted for attachment to a wheel axle of a vehicle, said push rod being coaxial with said piston and being axially movable in response to movement of said piston in said opposite direction, one axial end of said push rod being closer to the housing than the other axial end thereof, and a permanent magnet carried by said other end of said push rod; and a keep magnet for holding said piston and said push rod together in contact for movement in unison.
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Specification