Patent ID: 8777309

Claim:
A lumbar support for a vehicle backrest, the lumbar support comprising: a rest member having a front surface shaped to support an area of a user's back; an elastic member comprising: a) at least an attachment portion arranged behind said rest member and connected to an intermediate portion of said rest member, and b) two opposing ends designed to be connected to a backrest frame; said elastic member being designed to maintain said rest member in a rest position and to deform in response to a thrust of the user's back so as to backwardly release said rest member: between the rest position and a first position under normal use conditions, and from the first position to a second position when a thrust against the front surface exceeds a given force value; characterized in that the said elastic member has a characteristic force/displacement curve having a slope between zero and a given threshold in the section between the first and second positions; said threshold being equal to 0.5 N/mm.