Patent ID: 6695402
Filing Date: 2004-02-24
Classification: A47C,B60N

Abstract:
An adjustable lumbar support, in a seat having a backrest, for altering the contour of the backrest to provide adjustable lumbar support to a seat occupant, the lumbar support comprising:a base capable of being suspended within the backrest; a lumbar plate; linkage means pivotally connected between the base and lumbar plate for moving the lumbar plate toward and away from the base between an extended position and a retracted position to incrementally adjust the contour of the backrest, the linkage means includes a pair of articulated arms, a first joint means for pivotally connecting each of the articulated arms to the base, and a second joint means for pivotally connecting each of the articulated arms to the lumbar plate so as to allow independent pivotal movement of the lumbar plate with respect to each of the articulated arms when the lumbar plate is between the extended position and retracted position, each of the articulated arms includes an upper segment, a lower segment and a third joint means for pivotally connecting the upper segment to the lower segment; and means operatively connected to the linkage means for actuating the linkage means to selectively move the lumbar plate between the extended position and the retracted position, the actuating means includes a Bowden cable connected to the third joint means of each of the articulated arms, such that the Bowden cable can pull the third joint means of each of the articulated arms apart to move the linkage means to the retracted position and push the third joint means of each of the articulated arms together to move the linkage means to the extended position.