Patent ID: 6520577
Filing Date: 2003-02-18
Classification: B60N

Abstract:
A vehicle seat comprising:a seat cushion that supports a buttock of an occupant; a seatback having a thoracic portion and a lumber portion that support an upper body of the occupant; at least two elastic supporting members disposed in a transverse direction within the seatback, the elastic supporting members including a lower support member disposed within the lumber portion of the seatback to support a pelvis of the occupant and an upper support member disposed within the thoracic portion of the seatback to support a back of the occupant; a displacement mechanism disposed within the seatback and coupled between the seatback and the upper support member to move the upper support member in a rearward direction relative to the seatback; and a trigger mechanism disposed above the seat cushion within the lumber portion of the seatback and operatively coupled to the displacement mechanism at the lower support member to activate the displacement mechanism only upon the lumber portion of the seatback being displaced rearwardly in response to a rearward load greater than a predetermined value being applied to the lumber portion of the seatback.