Seat track locking mechanism with infinite adjustment

A vehicle seat assembly includes a seat bottom and a seat back supported for movement relative to the seat bottom such that seat position can be adjusted forwardly or rearwardly with respect to the vehicle. The seat assembly is mounted a vehicle structure via inboard track and outboard track assemblies. Each track assembly includes a first track and a second track supported for movement relative to the first track. The seat bottom is supported on the second tracks for movement with the second tracks. A locking mechanism is installed on each track assembly. The locking mechanisms include a spring that is mounted between the first and second tracks. The spring is biased into engagement with the first and second tracks to frictionally retain the second track in a locked position. A handle is manually actuated to move the locking mechanisms on each track assembly from the locked position to an unlocked position. The handle applies a force to the spring causing the spring to contract, allowing relative movement between the first and second tracks.