Spring fitting for training shoe sole - has plate bent into waves held between V=shaped walls of sole

摘要

The spring is formed in the sole of a training shoe and is a plate (1) bent into waves that alternately touch each of the walls that it is placed between. The walls are V-shaped and joined at one end. The plate is held in place by the sides of the walls (4) and by a stud (3), on the bottom wall near their joined end, that passes through a hole in the plate. The spring can be removable and interchangeable, or it can be fixed in the sole.