The present invention relates to a double-acting type dynamic back clearance relief driving system having two sets of worm shafts coupled with a worm gear, one worm shaft set acting as a prime mover worm shaft and the other acting as a displacement control worm shaft. When the system is driving, one...http://www.google.es/patents/US5499551?utm_source=gb-gplus-sharePatente US5499551 - Double-acting type dynamic back clearance relief driving system
Double-acting type dynamic back clearance relief driving system
