S38. Half “Stork’s Bill” Straight-Line Mechanism
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This straight-line model has seven links and eight revolute joints counting the grounded link and without counting the connecting crank and coupler link. Without the sliding joint on the right, this linkage would have two degrees of freedom according to the mobility criterion of linkages. The slide constraint on the right removes one degree of freedom. The resulting mechanism produces the straight-line motion of the cylindrical rod on the left which, perhaps, inspired the stork’s bill name by Reuleaux.

Reference :
Gelsone, Kathryn (Technician)
Peck, Susan (Technician)