Abstract: A powered seat adjuster slide unit is providing including a top rail for mounting a vehicle seat; a bottom rail for supporting the top rail; a guide rail pivotally joined to the top and bottom rails along generally opposite ends to stabilize the top rail; a first forward jack screw unit with a powered extendable jack screw, the first jack screw unit having pivotal axes in positions fixed with respect to the top and bottom rails; and a second rearward jack screw unit with a powered extendable jack screw, the second jack screw unit having pivotal axes in positions fixed with respect to the top and bottom rails.

Abstract: A seat fore and aft adjuster for a vehicle is provided which in a preferred embodiment includes a pair of parallel elongate channels secured to the floor of the vehicle, both channels having an inner space defined by vertical, concave upper and concave lower inner surfaces, the channels having a locking plate with a series of associated notches, and fore and aft rollers, the fore rollers including a tubular axle housing rotatively mounting elastomeric rollers and the housing being threadably affixed with a seat frame while at the same time affixing a bracket to the seat frame, and an independent guide secured to the bracket and extending into the channels' inner spaces and sliding against the upper surfaces thereof. A pin is slidably mounted in the fore axles for locking engagement with the locking plate. A leaf spring fixed with respect to the seat frame biases the locking pin toward engagement with the lock plate.

Abstract: An improved manual seat adjuster for selectively positioning a seat which requires as little space as possible to operate and that includes a primary and secondary locking arrangement for resisting greater than normal loading which may be experienced by the seat adjuster.

Abstract: A power seat adjuster which allows a seat to be adjusted to a desired elevation and pitch replaces a lift plate of a lift assembly with a lift bar. The lift bar is slid into grooves on an upper channel of a top plate, and the top plate is connected to a rigid link. Jack screws with shafts that have a nonround portion are provided to take up torque and keep the lift bars from binding with the top plate so that there is no interference in the operation of the power seat adjuster.