Walk-in mechanism associated with seat track structure

Claim 1

A walk-in mechanism associated with a seat track structure for a vehicle seat having a forwardly tiltable back rest, the seat track structure comprising an elongated lower stationary track for securement on the floor of a vehicle compartment, an elongated upper movable track slidably mounted on the stationary track along the longitudinal direction thereof for supporting thereon a seat cushion of the vehicle seat, an elongated lock plate secured to the stationary track and being formed with a plurality of longitudinally spaced locking holes, a crank handle having a shaft portion arranged along the movable track and rotatably supported on the movable track, a detent lever secured to the shaft portion of the crank handle for rotation therewith and arranged to be selectively engaged with the locking holes of the lock plate, and resilient means for biasing the detent lever toward the lock plate, the walk-in mechanism comprising: a release lever rotatably mounted on the shaft portion of said crank handle and being provided at an upper portion thereof with a first projection and at one side thereof with a second projection to be engaged with said detent lever; a resilient plate secured at one end thereof on said upper movable track and located above said release lever to be flexible in a vertical direction, said resilient plate being provided at an intermediate portion thereof with a downward projection and being formed at another end portion thereof with an opening to receive the first projection of said release lever therein; means for biasing said release lever toward a first position in which the first and second projections of said release lever are respectively disengaged from said resilient plate and said detent lever; and linkage means connecting said release lever to the back rest of said vehicle seat in such a manner that when the back rest is tilted forwardly, said release lever is rotated to a second position in which the first and second projections of said release lever are respectively engaged with the opening of said resilient plate and said detent lever and that when the back rest is raised backwardly, said release lever is returned to the first position; wherein said lock plate is formed with an upwardly protruded rear end portion which is located to brought into engagement with the downward projection of said resilient plate during backward movement of said movable track from a forwardly displaced position.