Patent ID: 7360832

Claim:
An impact absorption structure for a vehicle seat, wherein said vehicle seat includes a seat cushion frame and a seat back frame, said seat cushion frame comprising at least one side frame member having an outer wall facing outward from said seat cushion and an inner wall facing inward toward said seat cushion, said side frame member supported at a forward support point provided forward of and below said vehicle seat and supported at a backward support point provided backward of and below said vehicle seat, said impact absorption structure comprising: a first portion located forward of said backward support point formed by said outer wall and said inner wall integrally engaged together at top and bottom ends thereof to provide an enclosed cross-sectional space along a length of said first portion; a second portion contiguous and forward of said first portion formed by said outer wall and said inner wall integrally engaged together only at the upper ends thereof along a length of said side frame member; wherein a cut-away portion is located at a bottom end of the inner wall to provide an open cross-section space along a length of said second portion, wherein, said opened cross-section area is deformable at said cut-away portion by a great load transmitted from said seat back frame thereto, thereby absorbing a corresponding impact.