A scratch drive actuator (SDA) device comprising a drive shoe and an actuator. The drive shoe has a first drive shoe position and a second drive shoe position and is configured to urge a shuttle from a first shuttle position to a second shuttle position. The actuator is coupled to the drive shoe and...http://www.google.es/patents/US6877316?utm_source=gb-gplus-sharePatente US6877316 - Electro-thermal scratch drive actuator
