Lumbar support for a vehicle backrest

摘要

A lumbar support (11) for a vehicle backrest has a resting element (12) with a front surface (13) shaped for supporting an area of the back (5) of a user; the resting element (12) is connected to a frame (2) of the backrest (1) via elastic elements (15), which are bistable for allowing the resting element (12) to click from an advanced position to a rearward position when a thrust against the front surface (13) exceeds a given threshold.