A seat height adjusting device. A rail member is fixed to a floor. A lift link is rotatably connected to the rail member. A lower lift arm is connected to a seat cushion, the lift link, and the rail member through a link member. An upper arm is connected to a seat back and rotatably engaged with the lower lift arm. A lower arm is connected to the lower lift arm so as to sandwich the lift link and the upper arm with the lower lift arm. The lower arm is engageable with the lift link and the upper arm.

An improved manually adjustable vehicle seat assembly is disclosed. The adjustable vehicle seat assembly includes a vehicle seat, track assemblies each with a stationary track fixed to a vehicle floor and a translating track slidably interconnected with the stationary track, a horizontal adjustment mechanism that provides an occupant of the seat with the ability to position the translating tracks horizontally relative to the stationary tracks, a seat support structure, including forward and rearward seat support arm assemblies, for supporting the seat on the translating tracks, and a vertical adjustment mechanism having forward and rearward sector gears coupled with the forward and rearward seat support arm assemblies respectively, forward and rearward locking members mounted so as to be selectively engageable with the corresponding sector gear to prevent movement of the sector gear, and seat support arm assembly coupled thereto, when engaged, forward and rearward camming members mounted so as to be selectively moved to either engage or disengage the corresponding locking member, a resilient coupling between the camming members, a lever actuated control member, an actuating lever, and a fore and aft motion transmitting member coupled with the lever actuated control member and the camming members by pin and slot connections so that upon movement of the lever actuated control member one camming member is moved so as to disengage a corresponding locking member while the other camming member continues to hold the corresponding locking member in the engaged position.

A manually-operable six-way seat adjustment mechanism having a pair of laterally spaced tracks which are fixed securely to the vehicle's floor pan. A pair of carriages are slidably coupled to the tracks and are operable for synchronous longitudinal movement thereon. A seat assembly is fixedly secured to seat frame members supported from the elongated carriages for longitudinal movement therewith. A horizontal adjustment mechanism is operatively interconnected between each of the tracks and carriages to enable a seat occupant to selectively adjust the longitudinal position of the assembly. The manually-operable six-way seat adjustment mechanism also includes a front vertical adjustment mechanism and a rear vertical adjustment mechanism which are each operably interconnected between the laterally spaced seat frame members and the carriages to enable selective and independent vertical adjustment of their respective front and rear portions of the seat assembly. Finally, a travelling seat belt buckle anchorage arrangement is provided in association with at least one set of the slidably interconnected tracks and carriages for enabling selective longitudinal movement of a seat belt buckle anchor point with the seat assembly along the tracks while inhibiting vertical and horizontal separation therebetween.