Pressure drop signal generating valve cap for pneumatic tires
First Claim
1. A pressure drop signal generating valve cap for a pneumatic tire equipped with a tire valve having a valve tube, the valve cap comprising:
- a housing to be screwed onto said valve tube and including a pressure chamber and a reference chamber, said pressure chamber being admittable with a tire pressure to be controlled and said reference chamber being admittable with a given desired pressure;
a diaphragm separating said two chambers and adapted to become deflected into said pressure chamber whenever the tire pressure to be controlled is lower than the desired pressure;
an actuator means for opening the tire valve whenever the valve cap is screwed onto the valve tube;
a transmitter means including electric, electronic and circuitry components thereof, which--when activated--generates at least one signal frequency being wireless transmittable to a receiver means arranged adjoining to said pneumatic tire, and comprising a sequence control which terminates said signal transmission after a short duration thereof and resets said transmitter means in a stand-by state to become activated again;
a circuit board arranged within said housing and supporting said electric, electronic and circuitry components of the transmitter means;
a power supply means arranged at or within said housing; and
a mechanically operated switching means comprising a fixedly arranged conductor section and a movably arranged contact piece, both being operatively connected with a circuitry unit of the transmitter means,wherein said conductor section is arranged in a short distance to a rest position of the diaphragm in such a manner that a diaphragm deflection causes an electrically conductive connection between said conductor section and said contact piece.
1 Assignment
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Accused Products
Abstract
A valve cap adapted to be screwed onto the tire valve of a pneumatic tire generates a wireless transmissible pressure drop indication signal. The valve cap comprises a valve cap housing comprising a pressure chamber and a reference chamber. The non-blockable pressure chamber is admittable with the tire pressure to be controlled. The reference chamber is admitted with a desired pressure whenever the valve cap is screwed onto the tire valve. A signal generating means including transmitter means, power supply means and switching means is provided within said valve cap housing. The switching means comprises a conductor section fixedly arranged within the pressure chamber in a short distance to a rest position of a deflectable diaphragm. Any tire pressure drop will converge the diaphragm into the pressure chamber and will complete an electrical circuit whereupon a transmitter circuitry is supplied with voltage/current, and the transmitter means generates a pressure drop indicating signal of limited duration.
66 Citations
18 Claims
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1. A pressure drop signal generating valve cap for a pneumatic tire equipped with a tire valve having a valve tube, the valve cap comprising:
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a housing to be screwed onto said valve tube and including a pressure chamber and a reference chamber, said pressure chamber being admittable with a tire pressure to be controlled and said reference chamber being admittable with a given desired pressure; a diaphragm separating said two chambers and adapted to become deflected into said pressure chamber whenever the tire pressure to be controlled is lower than the desired pressure; an actuator means for opening the tire valve whenever the valve cap is screwed onto the valve tube; a transmitter means including electric, electronic and circuitry components thereof, which--when activated--generates at least one signal frequency being wireless transmittable to a receiver means arranged adjoining to said pneumatic tire, and comprising a sequence control which terminates said signal transmission after a short duration thereof and resets said transmitter means in a stand-by state to become activated again; a circuit board arranged within said housing and supporting said electric, electronic and circuitry components of the transmitter means; a power supply means arranged at or within said housing; and a mechanically operated switching means comprising a fixedly arranged conductor section and a movably arranged contact piece, both being operatively connected with a circuitry unit of the transmitter means, wherein said conductor section is arranged in a short distance to a rest position of the diaphragm in such a manner that a diaphragm deflection causes an electrically conductive connection between said conductor section and said contact piece. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification