Support for lower back provided by removable block of fabric-covered synthetic foam of triangular section placed in chair

摘要

A wedge-shaped block of fabric-covered synthetic foam is, in section, a right angled triangle of 10cm heeight, 8cm depth and 40cm width. Placed as shown in a chair, the support surface (4) presents an angle of 20-70 degrees, ideally 35 degrees, to the horizontal. It applies a moment (T), tilting the sacrum forward.