Back Rest

Material:

3 layers of 1.5mm Bendy Ply

After the template was cut, first layer of plywood was bent using heat gun (which surprisingly easy), then before the second layer of plywood glued and clamped on to the first layer, it was cut into 4 parts to give more strength.

Then, the last layer was glued on to the second layer and later trimmed off.

Back rest template was cut using jigsaw (not very good idea) and cutter knife (better, but it took longer).

Concept Development

From three initial concepts, I chose the third concept because I am interested in doing some experimentation with bent plywood.

RENDERINGS

Material consideration 1: plywood seat + back rest

Material consideration 2: solid timber seat + aluminium sheet

Ergonomic Study

MOCK-UP

1: 5 Mock up

1: 1 Mock up

Blue foam seat + Cardboard backrest

CONCEPTS

Concept 3:

>> Legs are attached to the seat with threaded steel rod/dowel

>> Back Rest (Pivot Joint)

Material Consideration: Legs + Seat >> Solid timber , Back Rest >> Plywood

Concept 2:

>>4 parts:

Legs >> Each front leg diagonally connected to the back leg with steel bracing.

Seat

Back rest >> slotted in to seat

>>Material Consideration:

Legs >> solid timber / Tubular steel

Seat >> Plywood

Back rest >> Plywood

Concept 1:

3 separate parts >> Front legs, Seat, Folding Back Legs + Back Rest

Front legs attached to seat with threaded rod/dowel.

Back legs are slotted in to the holes on the seat.

Material Consideration >> Solid Timber