Shape of Push-and-Turn Lids

摘要

Two experiments were performed on push and turn lids. In Experiment 1, the reference design was circular. "Radiator cap" lids were built with 5, 7 and 9 mm levers with 2, 3 or 4 levers/lid. Lids were 54 and 76 mm dia. The 19 student subjects exerted 29% more torque on the 76 mm dia lid. Either 2 or 4 levers, each 7 or 9 mm long, gave most torque. In Experiment 2, dome-" shaped lids were tested vs flat lids. The dome lids were not significantly better.