Question

The design of the folding chair shown below depends on the proper selection of a fourbar linkage. The joints of the fourbar linkage are shown A, B, C, and D. The chair seat is attached to the coupler link at the joints and D. The seat moves between the folded position at an angle 90° and the open position at 0° The coupler link length is 10cm Design a four-bar mechanism to move the seat between the folded and open positions as shown со D АЗ DO oc BO

Answer 1

solution : D A CD = 10cm (couples). B In 4-bar mechanism, the link opposite to coupler is called fined link. Here AB is the fined link. Opan position : to B B wo closed position must In closed position, joint a coincide with joint a AC CD = AD = 10 cm. To determine AB, BC :- Do to D но с Bc - 1 10% + (1/2)2 H: B Based on the Height of chair you require, AR- RC (100+ (1/2)2