| 摘要 |
1382877 Tyre under-inflation indicators; balance weights R G WHITEING and J G A VAN MILL 11 April 1972 [17 Dec 1971] 16680/72 Heading B7C [Also in Divisions G1 G4 and H1] An alarm system (see Division G4) is applicable to the monitoring of pressure or temperature of tyres. As described, a permanent or electromagnet is mounted on a stationary member adjacent the wheel of a vehicle and momentarily closes a magnetically operable reed contact unit 55 each time the contact unit passes within the field of the magnet. A switch 54 is opened if the tyre pressure or temperature is abnormal so that a current pulse is induced in windings 56, 57, inducing a pulse in pick-up coil 50 which (after optional amplification at 51) triggers an SCR 53 which operates a red light 52, a buzzer 60 and extinguishes a green light 58. Balance weights.-Details 54 ... 57 may be encapsulated in a protective material and clipped to the rim of the wheel (Fig. 7, not shown) in the manner of a balance weight. Modifications.-Figs. 2 and 3 (not shown) relates to an electronic comparator arranged to monitor the pick-up coils 50 on a pair of wheels and to provide a warning of a defective tyre on one of the wheels. Fig. 4 (not shown) depicts a mimic diagram in which a red light indicates which of six tyres of a vehicle are defective. Fig. 5 (not shown) depicts a tyre valve having a branch pipe feeding a pressure sensitive switch. |
