Sole Adhesion Tester
is used for the sole adhesion of the footwear. Digital model is also available. The system consists of a spring dynamometer to indicate the load applied at the junction of the sole and the upper, a lever arrangement to transmit the load exerted on the toe piece to the spring dynamometer, a straight edge fulcrum for resting the shoe on during the test, and a set of interchangeable toe pieces having different curvature. The spring dynamometer indicates the load applied on the joint directly in kilograms, taking into account the mechanical advantage of the lever transmitting the force from the toe piece to it. The load is indicated on a circular dial. The dynamometer has two pointer, a black ponder to indicate the instantaneous load acting on the toe piece and a red dummy pointer to indicate the maximum load applied before failure of adhesion. The toe piece are five in number and having different curvature to enable toes and heels of different shapes and sizes to be tested. The length of arc of each toe piece, however, is the same to ensure that the load is applied only on a fixed length of joint. They are made from carbon steel for giving a long operational life. Any one of the toe pieces can be held in the equipment at one time. The fulcrum on which the shoe is placed during the test has adjustable height to enable soles of different thickness to be tested. The height of the fulcrum is adjusted with the help of spacer strips provided with the instrument. The instrument is finished in painting and bright chrome plating to give it a corrosion resistant finish.