Lumbar support for a vehicle backrest

摘要

A lumbar support for a vehicle backrest has a rest member with a front surface shaped to support an area of a user's back, and an elastic member behind the rest member; the elastic member has an intermediate portion fixed to the rest member and two opposite ends fixed connected to a backrest frame, maintains the rest member in a rest position and can deform in response to a thrust of the user's back so as to let the rest member move between the rest position and a first position under normal conditions, and then abruptly towards a second position when a thrust of a user's back exceeds a given force value; the force/displacement curve of the elastic member has a slope which is between zero and a given threshold in the section between the first and the second positions, the threshold being equal to 0.5 [N/mm].

主权项

1. 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, andb) 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.