发明名称 Tire pressure loss indicating device
摘要 A valve cap is screwed onto a pneumatic tire and generates an indication whether a prefilled tire pressure is still existent or not. For this purpose a valve cap (1) comprises a deflectable diaphragm (30) in an inner housing separating a pressure chamber from a reference pressure chamber. The reference pressure chamber registers the prefilled tire pressure. The diaphragm (30) is deflected toward the closed housing end when the actual existent tire pressure drops in comparison with the registered tire pressure. Onto the diaphragm (30) a permanent magnet (40) is placed, which can be in a first position (normal position of the diaphragm) or in a second position adjacent to the housing end. The check of the magnet position and the generation of an indication signal indicative of the actual tire pressure status will be executed by a hand device, which must be brought into a defined position with respect to the valve cap. The hand device comprises at least one magnet field sensor and an indicating device which generates an optic or acoustic signal to register the tire pressure status at the time of the tire check.
申请公布号 US5557256(A) 申请公布日期 1996.09.17
申请号 US19940236508 申请日期 1994.04.29
申请人 AUTO-ZUBEH+E,UML O+EE R-INNOVATIONEN GASELLSCHAFT MBH 发明人 ACHTERHOLT, RAINER
分类号 B60C23/00;B60C23/04;F16K27/08;G01L9/14;G01L17/00;(IPC1-7):B60C23/00 主分类号 B60C23/00
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