Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1990-07-27
1991-06-18
Crosland, Donnie L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340447, 731465, 731468, 116 34R, 200 6122, 137233, B60C 2300
Patent
active
050252445
ABSTRACT:
A tire pressure indicator includes: a hollow cylindrical body with a closed side and an open side; a light bulb with a threaded negative portion and a positive contact detachably mounted at the closed side of the hollow cylindrical body; a transparent cover positioned at the closed side over the light bulb; a first conductor, together with a piston container, connected to the threaded negative portion of the light bulb; a sleeve member movably disposed around the piston container in the hollow cylindrical body; a piston unit composed of a mercury cell, a pressure spring and a sliding member movably disposed in the piston container; a pressure sensor which is a combination of a flexible film member, a second conductor and an air-channel member fixed on the closed side of the sleeve member under the piston unit; and a supporting base with an air chamber screw-connected to the open side of the hollow cylindrical body; whereby, when the air pressure indicator is connected to the tire valve of an associated tire, the tire pressure condition of the associated tire can be monitored and indicated via the light bulb without incurring any air pressure leakage of the associated tire.
REFERENCES:
patent: 3938078 (1976-02-01), Davis et al.
patent: 4726223 (1988-02-01), Huang
patent: 4737760 (1988-04-01), Huang et al.
patent: 4814745 (1989-03-01), Wang
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