| 摘要 |
<p>The object of the invention is to provide a chair with adjustable seat height in which a height change, made to suit the size of a given occupant, will at the same time change the height of the back rest above the seat. The amount of rise of the back rest is arranged to be in accordance with the proportions of average people. There is a pivoting, four-bar parallelogram-type linkage (18-19-21-20) which raises the back support relative to the seat as the seat is raised. The front part of the linkage (18-19) is fixed in height while the rear part (21-20) raises and lowers the seat back. The linkage is rotated upward at the rear of the chair by one pin (34) in the middle of the linkage which rises with the seat. An additional movement is developed in the linkage by having it bent downward toward the rear of the chair. The movement developed is a shifting of the seat back rearward of the seat as the seat rises.</p> |
