Hydraulic actuated power tool

B - Operations – Transporting – 21 – J

Patent

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138/40

B21J 15/20 (2006.01) B21J 15/02 (2006.01)

Patent

CA 1036897

ABSTRACT OF THE DISCLOSURE The hydraulic actuated power tool includes a barrel having an internal, annular bulkhead separating the barrel into two cylinder chambers. A single piston shaft having two pistons thereon operates within the cylinders of the barrel. One of the pistons is located intermediate the shaft ends and the other is positioned at the terminal end of the piston rod. This latter piston serves as the back wall for the rear cylinder chamber. The piston shaft is ported so that in the power stroke both pistons are being urged rearward, whereas in the return stroke only the for- ward piston is being acted upon. The porting includes a transverse port extending across the piston shaft and a longitudinal port connecting midway of the transverse port and extending along the piston shaft and terminating in a bifurcated passageway which extends through the forward piston. A floating front wall makes up the end wall of the forward cylinder. The rear piston is attached at the terminal end of the piston shaft through a split retainer ring.

267485

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