Patent ID: 7640743

Claim:
A user interface linkage system, comprising: a first user interface configured to rotate at least partially around a first axis; a second user interface configured to rotate at least partially around the first axis; a first user interface fluid chamber coupled to the first user interface, the first user interface fluid chamber including a first user interface hydraulic fluid volume that varies at least in response to rotation of the first user interface around the first axis; a second user interface fluid chamber coupled to the second user interface, the second user interface fluid chamber including a second user interface hydraulic fluid volume that varies at least in response to rotation of the second user interface around the first axis, the second user interface hydraulic fluid volume in fluid communication with the first user interface hydraulic fluid volume; a temperature compensation fluid chamber, the temperature compensation fluid chamber including a temperature compensation hydraulic fluid volume that varies in response to temperature variations of hydraulic fluid disposed therein; and a temperature compensation valve including a first flow port and a second flow port, the temperature compensation valve first flow port in fluid communication with the first and second user interface hydraulic fluid volumes, the temperature compensation valve second flow port in fluid communication with the temperature compensation hydraulic fluid volume, the temperature compensation valve movable between at least an open position, in which the temperature compensation valve first and second flow ports are in fluid communication with each other, and one or more closed positions, in which the temperature compensation valve first and second flow ports are not in fluid communication with each other.