A driving tool with a flywheel, a driver, an actuator and a roller that is moveable between an unactuated position and an actuated position. Positioning of the roller in the actuated position forces an engagement surface on the driver into contact with a rotating edge of the flywheel to transfer energy...http://www.google.fr/patents/US8011549?utm_source=gb-gplus-shareBrevet US8011549 - Flywheel configuration for a power tool
