A seat body is assembled with a seat chassis device that has a seat chassis mounted on the seat body. The seat body has an accommodating space and guiding troughs each having a guiding opening. The accommodating space includes a propping portion to be resiliently flattened. The seat chassis device has a base connected thereto and is formed with sliding wedge portions to slide into the guiding troughs from the guiding openings. When the seat chassis slides to a predetermined position, the propping portion springs up and abuts against the seat chassis. A spring between the base and the seat chassis is upward pushed by a resilience-adjusting unit and has its upper end received in a dome raised from the seat chassis and received in a hollow portion of the seat body.

An adjuster track assembly for a vehicle seat includes an upper rail configured to be fastened to the vehicle seat and displaceable in a longitudinal direction, a stationary lower rail, a linear guide provided in the longitudinal direction between the upper rail and the lower rail which includes a bearing element for longitudinal guidance and support of the upper rail. The bearing element includes bearing cages with rollers accommodated within roller pockets having retention areas for guiding said rollers both in the longitudinal direction and the direction perpendicular to the longitudinal direction, and absorption areas for receiving or eliminating wear debris or abrasions.

A vehicle seat includes a side frame of a seat cushion having a side frame opposing portion extending in a front-rear direction of the seat cushion, and a bracket member disposed below the side frame having a bracket opposing portion extending in the front-rear direction and opposing the side frame opposing portion. The side frame opposing portion and the bracket opposing portion are provided such that the side frame opposing portion and the bracket opposing portion come in contact with each other in a state in which the seat cushion sinks rearward and downward when a load acted on the vehicle seat from behind is transmitted to the seat cushion from the seat back via a connection part. An arrangement interval between the bracket opposing portion and the side frame opposing portion is smaller in a front side than in a rear side in the front-rear direction.

An adjuster track assembly for a vehicle seat includes an upper rail configured to be fastened to the vehicle seat and displaceable in a longitudinal direction, a stationary lower rail, a linear guide provided in the longitudinal direction between the upper rail and the lower rail which includes a bearing element for longitudinal guidance and support of the upper rail. The bearing element includes bearing cages with rollers accommodated within roller pockets having retention areas for guiding said rollers both in the longitudinal direction and the direction perpendicular to the longitudinal direction, and absorption areas for receiving or eliminating wear debris or abrasions.

A seat sliding mechanism includes a lower rail, an upper rail, a position sensor and a sensor bracket. The lower rail is provided on a side of a vehicle floor. The upper rail is provided at a lower part of a seat body and is slidably supported by the lower rail along front and rear directions. The position sensor is provided on the upper rail and detects a position along front and rear directions. The sensor bracket is provided on the lower rail and its proximity state to the position sensor is to be detected. The sensor bracket includes a base, a detected portion and a supporting portion. The base is fixed to a bottom of the lower rail. The detected portion is detected by the position sensor. The supporting portion supports the detected portion.

A longitudinal seat-adjustment device may have one rail arrangement having at least one rail pair and at least one locking element. The rail arrangement is formed from a top rail and a bottom rail, which are movable relative to one another. The at least one locking element is retained in a spring-loaded and movable manner on the top rail and blocks a movement of the top rail in the bottom rail in a locking position, and enables a movement in an unlocking position. A single locking spring is provided, which may have a first spring portion for locking abutment against a first side of the locking element and a second spring portion for locking abutment against a second side of the locking element, the second side lying opposite the first side. A vehicle seat having such a longitudinal seat-adjustment device is also provided.

A power rail system for a vehicle seat includes an outer track defining an elongated channel with an elongated lead screw mounted in the channel. An inner track is received in the elongated channel and a power length adjuster gear transmission is mounted to the inner track and drivingly engaged with the elongated lead screw. A seat structure is mounted to the inner track for movement along the power rail system.

A power rail system for a vehicle seat includes an outer track defining an elongated channel with an elongated lead screw mounted in the channel. An inner track is received in the elongated channel and a power length adjuster gear transmission is mounted to the inner track and drivingly engaged with the elongated lead screw. A seat structure is mounted to the inner track for movement along the power rail system.