TIRE PRESSURE INDICATING APPARATUS

• Main Authors: ENDERS D,US, MCGHEE C,US
• Format: Patent
• Language: English
• Published: 20.02.1973
• Subjects: DEVICES OR ARRANGEMENTS RELATED TO TYRES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; PERFORMING OPERATIONS; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TRANSPORTING; TYRE CHANGING OR REPAIRING; TYRE INFLATION; VEHICLE TYRES; VEHICLES IN GENERAL

For monitoring tire pressures on a vehicle such as a passenger automobile, truck or bus, individual hub units are mounted on each wheel unit, each hub unit including a radio transmitter, and a radio receiver is positioned leading to the vehicle operator. Each hub unit includes bellows means responsive to tire pressure to operate a visual pressure gauge on the hub unit which may be observed by the operator when the vehicle is stopped, and to energize the transmitter when the pressure decreases to a preselected value. For dual wheel units used on heavy duty vehicles, a common bellows means may respond to the lower pressure of the two tires to indicate the lower pressure on the gauge and transmit the fault signal. The dual wheel unit may include two bellows means for actuating separate visual gauges for the two tires, with the two bellows mechanisms energizing a common transmitter, or alternatively energizing respective separate transmitters. The hub unit may include valve means for equalizing tire pressures.