THE FAN · seat and back working surfaces, one frame

Tick the chairs to overlay; add your own chair or a hypothetical. Solid = working surface; dotted = extension to the implied seat/back vertex. Angles from horizontal (seat pan, down toward the rear) and from vertical (back rake).

Units

Chairs

Add a chair (real or hypothetical)

name

seat front height

seat pan °

seat length

back rake °

back gap from vertex

back length

Registration

seat front edge

implied vertex

Preset values carry their basis: measured (this project), listed (manufacturer), or estimated from images and marked for verification. Seat–back angle = 90 + rake − pan.