초록 ▼

Disclosed is an adjustable chair backrest having a frame and deformable material covering one side of the frame. A pressure having a rigid lower portion and an elastically deformable upper portion is mounted on a cam. The plate and cam pivot about an axis in response to rotation of a spindle to caus

Disclosed is an adjustable chair backrest having a frame and deformable material covering one side of the frame. A pressure having a rigid lower portion and an elastically deformable upper portion is mounted on a cam. The plate and cam pivot about an axis in response to rotation of a spindle to cause outward movement of the deformable material.

대표청구항 ▼

An adjustable chair backrest comprising: a frame; deformable material covering one side of said frame; pivot means connected to said frame, said pivot means comprising a carriage fixed to said frame; a spindle journalled within said carriage and having one end extending outwardly and exteriorly of s

An adjustable chair backrest comprising: a frame; deformable material covering one side of said frame; pivot means connected to said frame, said pivot means comprising a carriage fixed to said frame; a spindle journalled within said carriage and having one end extending outwardly and exteriorly of said frame; a movable nut threadingly engaging said spindle, said nut longitudinally movable with respect to an axis extending along said spindle in response to spindle rotation; and a cam located within said carriage and engaging said nut; a pressure plate mounted to said cam, said pressure plate having a rigid lower portion and an elastically deformable upper portion; whereby said plate and cam pivot about said axis upon longitudinal movement of said nut along said spindle in response to rotation of said spindle, said plate outwardly movable with respect to said frame and against said deformable covering.