Patent ID: 7090301

Claim:
A support structure for incorporation in a frame of a seat comprising: a first support bar having a first attachment device adapted to affix said first support bar to the frame; a second support bar substantially parallel to and spaced apart from said first support bar and having a second attachment device adapted to affix said second support bar to the frame, wherein said first support bar and said second support bar define a support plane, the support plane having a centerline which is substantially orthogonal to said first and said second support bars, said centerline being substantially aligned with the center of at least one of said first and said second support bars; and a plurality of springwires having an first portion connected to said first support bar, a second portion connected to said second support bar and a lumbar portion located between said first portion and said second portion, wherein there is an increased stiffness in said springwires disposed further away from said centerline.