A shock absorbing device in a press is formed by having a telescopically sliding member fastened to the punch plate of the press and a stopper member fastened to the die plate of the press and placing an oil of high viscosity between the post and the outer cylinder of the telescopically sliding member....http://www.google.fr/patents/US4431172?utm_source=gb-gplus-shareBrevet US4431172 - Device for absorbing punching shock in a press
