Title:
TIRE PRESSURE MONITORING DEVICES
Document Type and Number:
WIPO Patent Application WO2002081236
Kind Code:
A9
Abstract:
A low tire pressure monitoring device (20) that is provided within a tire valve wire stem (210) and methods of using the same. The monitoring device comprises a counter-pressure chamber (21), a flexible membrane (36), a contact member, counter-pressure chamber pin (230), a PC board (29), and a means for emitting a signal. The monitoring device is calibrated by trapping the tire's initial air pressure in the counter-pressure chamber. The monitoring device (20) monitors the pressure differential between the counter-pressure chamber (21) and the tire. When the pressure differential between the pressure in the counter-pressure chamber and the pressure within the tire exceeds a predetermined maximum pressure differential, the flexible membrane (36) is deflected so that an electrical circuit is completed and a warning signal is emitted.
Inventors:
LUNDQVIST TORBJOERN BOSON (US)
GRONDAHL CLAES GOERAN (FI)
GRONDAHL CLAES GOERAN (FI)
Application Number:
PCT/US2002/005415
Publication Date:
May 06, 2004
Filing Date:
February 20, 2002
Export Citation:
Assignee:
LUNDQVIST TORBJOERN BOSON (US)
GRONDAHL CLAES GOERAN (FI)
GRONDAHL CLAES GOERAN (FI)
International Classes:
G01L17/00; B60C23/00; B60C23/02; B60C23/04; B60C29/04; G01L27/00; (IPC1-7): B60C23/00; B60C23/02
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