| 摘要 |
1,149,719. Indicating brake fluid leakage. AMP. Inc. 30 March, 1967 [13 April, 1966], No. 14503/67. Headings F2E and F2F. [Also in Division H1] A fluid pressure responsive switch for signalling on imbalance in the pressures existing within dual pipe-lines of a vehicle braking system comprises a shuttle 22, Fig. 1, sliding within a bore 18 communicating at each end with a fluid passageway 12, 14 each forming part of a pipe-line between a master cylinder and a slave cylinder, a switch portion 40 secured to the body portion 10 having a biased plunger extending through aperture 38a to engage the shuttle between a pair of surfaces 34a, 34b arranged to move the plunger axially within the switch portion into engagement with an electrical contact pin 58 on movement of the shuttle in either direction. The pin 58 is engaged with a connector 64 in an insulating housing 66 within a boot 71 having a ribbed end part received within the switch portion. The connector 64 is connected by a wire 68 to a warning light 70 and battery 72. Pressure failure in either passageway causes the shuttle 22 to move in the respective direction to lift the plunger 42 thereby illuminating the warning light 70. In another embodiment a protective boot (84), Fig. 2 (not shown) extends around the insulating housing and part of the switch portion. |
