A mechanical delaying device of a shredder includes a lever connected with a spindle at frames of blade assemblies, a roller accommodated around a shaft at an end of the lever, a baffle fastened at an end of the shaft, a spring disposed between the roller and the baffle, and a helical cam disposed at...http://www.google.fr/patents/US7014133?utm_source=gb-gplus-shareBrevet US7014133 - Mechanical delaying device of shredder
