A center bar inserter having a frame for supporting a plurality of forks for pivotal movement about a horizontal axis is provided. Insertion of a center bar is preformed by simultaneously extending the forks into the concrete slab while the forks pivot about a horizontal axis. A pair of vibrating sleds...http://www.google.de/patents/US4995758?utm_source=gb-gplus-sharePatent US4995758 - Center bar inserter
