| 摘要 |
A pair of electrical switches are operable by a movable lever between a first condition where the first switch is on and the second switch is off; to a second condition where the first switch is off and the second switch is on, by movement of a piston connected to a pressure source via an inlet port. A flange is fixed on the piston shaft, and a compressed spring is mounted over the piston shaft between the flange and a sleeve surrounding the piston bore. A pressure close to ambient moves the flange which in turn moves the lever to the first position, while a pressure substantially less than ambient moves the flange in the direction to move the lever to the second position. The switches are adapted to respond to the pressure of the input manifold of a motor vehicle, actuating the vehicle headlight circuit when the motor is running and the manifold pressure is very high, and actuating the starter/ignition circuit when the motor is not running and the manifold pressure is at ambient.
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