A show sole is provided with one or more chambers therein. A piston-like cleat plate is fitted for vertical movement in each chamber. Cleats are fitted to the cleat plates, and openings are provided in the chamber bottom for permitting the cleats to pass therethrough when extended. The cleat plates are...http://www.google.co.uk/patents/US4873774?utm_source=gb-gplus-sharePatent US4873774 - Shoe sole with retractable cleats
