Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1991-05-31
1992-07-14
Ng, Jin F.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
B60C 2302
Patent
active
051306948
ABSTRACT:
An apparatus is for sensing the presure in a vehicle's tires while the tire is revolving. Tire pressure is tapped at the valve stem. Pressurized air is passed through a delivery tube from the valve stem to a pressure sensor which detects either a too high or a too low pressure from the tire. The delivery tube passes from the valve stem over the outer face of the tire to the center of the wheel. There it enters a hole bored along the axis of rotation of the wheel and passes through the wheel and suspension parts until it reaches a free space. Here the rotating tube connects to an inner, rotary master cylinder of the sensor. The master cylinder includes a piston acted upon by the pressurized air from the tube. A spring opposes the air pressure, so that the axial displacement of the piston is proportional to the tire pressure. An electrical contact is moved by the piston; it can touch either of two stationary contacts, whose positions correspond to over pressure or under pressure, and complete circuits to light warning lamps for the driver. The master cylinder spins within an outer case which is fastened to the wheel suspension and which contains the stationary contacts.
REFERENCES:
patent: 2731936 (1956-01-01), Fowler
patent: 3660816 (1972-05-01), Barber
patent: 3693149 (1972-09-01), Johnston
patent: 4487241 (1984-12-01), Van den Merwe
patent: 4646673 (1987-03-01), Fordyce
Litman Richard C.
Ng Jin F.
Tumm Brian R.
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