Adding More Bite to the Origami Chomper
摘要
We begin with Jeremy Shafer’s Chomper, a playful kinematic origami gadget with a two degree-four vertices. Pressing both actuating points of the symmetrical gadget causes a set of jaws to chomp, or open and close. We then explore the oriceps, an origami forceps design derived from the chomper. From an origami design perspective the oriceps is a chomper gadget with a strip graft that splits the vertices along the central mirror-axis crease. The resulting gadget has four degree-four vertices with two additional affordances, a flat gripping point and a flat area for attaching a linkage mechanism facilitating the manipulation of the jaws. The chomper and oriceps gadgets actuate two ‘jaws’ and at this point we ask, “can we add more ‘jaws’, or bite, to this gadget?” The answer is yes. A chomper with more jaws is indeed possible! We show that adding more jaws is possible by rotating the jaw mechanism design around the central axis. Enter the three-jawed Thysan gadget, named after the distinctive triangular petals of the Australian native Thysanotus genus within the family Asparagaceae. This gadget features six degree-four vertices. We present a geometric study of the Thysan gadget through a parametric design model. The model facilitates interactive design and visualisation and implements recent advancements in rigid origami for degree-four vertices and rigid origami kinematic equations.