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Vehicle seat adjustment with actuator isolation valves

  • US 7,137,330 B2
  • Filed: 11/24/2004
  • Issued: 11/21/2006
  • Est. Priority Date: 10/22/2003
  • Status: Active Grant
First Claim
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1. A fluid powered vehicle seat adjustment system, the system comprising:

  • a fluid actuator including a first inlet/outlet and a second inlet/outlet, the actuator being responsive to pressurised fluid directed to and from the first and second inlet/outlets;

    a source of pressurised fluid; and

    a controller for selectively controlling and directing pressurised fluid selectively to either the first or second inlet/outlets of the actuator;

    wherein the actuator further comprises a first actuator isolation valve associated with the first inlet/outlet of the actuator and a second actuator isolation valve associated with the second inlet/outlet of the actuator;

    the first and second actuator isolation valves are biassed towards a closed position to close off the respective inlet/outlets and prevent a flow of fluid from the actuator through the inlet/outlets, and open and allow a flow of fluid from the actuator via the respective inlet/outlet in response to pressurised fluid being supplied to the other inlet/outlet.

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