| 摘要 |
A pneumatic lumbar adjustment system for a vehicle seat includes an inflatable bladder, a pump and a solenoid valve, all of which are mounted on a backing plate which is secured to the back frame of the seat in the lumbar region. The pump and solenoid valve are connected to the vehicle electrical system through a three way switch accessible to the seat occupant through a two terminal lead. One switch position is the "off" position in which power to both the pump and the solenoid valve are turned off, and the other two positions are actuated positions, but in which one actuated position reverses the polarity of the terminals. In one of the actuated positions, power is supplied to the pump and the solenoid, causing the bladder to inflate. In the other actuated position in which the polarity of the terminals are reversed, power is supplied only to the solenoid valve and not to the pump, causing the solenoid valve to exhaust air from the bladder. Since inflation and deflation of the bladder may be stopped at any time by the occupant merely moving the switch to the off position, the desired amount of lumbar support may be selected.
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