Bows, curves, chair backs and use of rapid prototyping tools

Project advisor Professor Chris Dewart

Initial idea: flexing of bows. The back legs of the chair can flex like bows; rocking chair? The first prototype was made from 3/4" plywood (see below); bow and flexing will be investigated next.

Curves / arcs appear as straight lines in certain views; with rotation of the surface on which the curve lies, we can 'control' max / min size / appearance of the curve...

The seat surface is constructed in Rhino by lofting 3 curves; The two "h-shaped" legs and the seat are carved on a CNC router. The seat height is 17" (45cm). Sizes of seat / trapezoid are: depth 17"; wider width 19", narrower width 11"

Two L-shaped profiles (2 pieces of 3/4") are glued to the seat. The "h-shaped" legs are attached with screws through the L profiles. Note that the back of the curved leg part under the seat is flat; about 7" of the seat rests on the two intersecting (flat) leg elements.
The angle between the two "h-shaped" legs is 80°. The front sides of the legs are rounded.


3/4" Baltic birch plywood. Chair backs are made from vine, rubber bands,
paper fiber with wire.


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