Angled Hinge vs Horizontal Hinge - The Golfing Machine
Coined by Homer Kelley in his book The Golfing Machine, he details that "Hinge Actions" describe and control the manipulation of the hands through the impact interval. Here's a look at the difference in trajectory between angled hinge action (left), which is the clubface simultaneously closing & laying back, producing a higher flight than the horizontal hinge action (right), which is clubface closing only.