Pressure switch for monitoring tire pressure, particularly of motor vehicle tires
First Claim
1. A pressure switch for monitoring tire pressure of motor vehicle tires, which is fastened at a wheel rim of the tire and is actuated by inflating pressure in the tire, comprising:
- a reference pressure chamber which faces in the direction of the tire and is sealed off from the tire by an electrically conductive switching diaphragm;
the chamber supports a contact pin which interacts with this switching diaphragm to close an electric circuit between the pin and diaphragm; and
the switching diaphragm has applied to it a force responsive to the tire pressure and a mass which is controlled as a function of centrifugal force indicative of tire rotational speed so that closing points of the pressure switch are determined by tire pressure that varies automatically with tire rotational speed.
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Accused Products
Abstract
A pressure switch for monitoring a tire pressure of a motor vehicle tire is fastened to a wheel rim and is actuated by the inflating pressure in the tire. The pressure switch comprises a reference pressure chamber which is sealed off by an electrically conductive switching diaphragm in the direction of the tire, and carries a contact pin interacting with this diaphragm. The switching diaphragm has a mass which is controlled as a function of centrifugal force in response to tire rotation such that the switching point of the pressure switch can be changed automatically as a function of vehicle speed.
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Citations
20 Claims
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1. A pressure switch for monitoring tire pressure of motor vehicle tires, which is fastened at a wheel rim of the tire and is actuated by inflating pressure in the tire, comprising:
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a reference pressure chamber which faces in the direction of the tire and is sealed off from the tire by an electrically conductive switching diaphragm; the chamber supports a contact pin which interacts with this switching diaphragm to close an electric circuit between the pin and diaphragm; and the switching diaphragm has applied to it a force responsive to the tire pressure and a mass which is controlled as a function of centrifugal force indicative of tire rotational speed so that closing points of the pressure switch are determined by tire pressure that varies automatically with tire rotational speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification