Patent ID: 6155643
Filing Date: 2000-12-05
Classification: A47C

Abstract:
A device for adjusting the height of a back rest of a seat, comprising:a guide element rigid with a support plate of a seating portion,a slide for supporting said back rest, said slide being engagable with said guide element and slidable along it,at least a rectilinear toothed portion with teeth having an active flank and a passive flank, and an elastic member which is selectively engageable with said teeth of said rectilinear toothed portion;wherein said rectilinear toothed portion defines a substantially vertical first way for said elastic members which elastically adheres to said rectilinear toothed portion and which slides freely along said passive flanks of said teeth during the raising of said back rest and is locked by said active flanks after each passage over a tooth and a second way parallel to said first way for the free sliding of said elastic member during the descent of said back rest,said first and second ways being spaced by said rectilinear toothed portion and being connected through a pair of passages placed at both ends of said first and second ways and shaped so as to convey said elastic member towards said first way during the rising of the back rest and toward said second way during the descent of said back rest.